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1
Staines, Cyril Spiteri. "Sensorless position estimation in asymmetric induction machines." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267588.
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Cilia, Joseph. "Sensorless speed and position control of induction motor drives." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362888.
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3
Bergman, Erik. "Pressure Control using Sensorless Voice Coil." Thesis, Linköpings universitet, Reglerteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95998.
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In this master thesis, a new method for estimating the position of the moving parts of avoice coil is presented. Instead of using a position sensor the method exploits the connectionbetween the position and the inductance of the voice coil. This is done by superpositioning a small sine voltage signal and the voice coil voltage control signal. By measuring thevoltage and current and using the fourier transform, the impedance and phase difference iscalculated which are used to compute the inductance. A medical ventilator (also known as a respirator) concept is developed with a control systemwhich takes the expiratory pressure from a higher to a lower level. The position estimationalgorithm is then used in an attempt to improve the pressure control. The result is a slightlymore stable control system. The master thesis is conducted at Maquet Critical Care (MCC) in Solna, Sweden. MCC is amedical technology company working with high performance medical ventilators. The longterm goal of this work is to develop a ventilator which is more comfortable for the patient.
4
Barnard, Francois Jacobus Wessels. "Position sensorless control of a transverse-laminated reluctance synchronous machine." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95904.
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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: The focus of this thesis is position sensorless control of a transverse-laminated reluctance
synchronous machine. Rotor position information is required for high-performance closedloop
control of the reluctance synchronous machine and is conventionally supplied by
unreliable hardware position resolvers. In addition a FPGA-based rapid prototyping
system is completed as part of the research term for control of the machine drive system.
For the first time the unified active-
ux (AF) method is investigated and implemented
for position sensorless control of the transverse-laminated reluctance synchronous machine
in this study. The method is based on the torque equation of the machine and is basically
the same for any AC machine. The estimation scheme is implemented for closed-loop
position sensorless control from low- to rated speed in the entire rated load range with
simulation and measured results confirming its capabilities. A number of characteristics
of the machine (including generator operation) have implications for implementation of
the active-
ux (AF) method and are therefore investigated.
Another position estimation method investigated is the arbitrary injection (AI) scheme
which is derived to be completely machine parameter independent. The method simply
requires a current progression at each calculation step allowing use of a smaller injection
voltage. This method is implemented again on the reluctance synchronous machine
and is shown to be capable of position sensorless current and speed control of the drive
from standstill to rated speed with simulation and measured results. However, when the
machine is operating above low speeds it is shown that this technique is only capable of
position sensorless control at low loads.
To deliver position sensorless control in the entire rated speed and load range a new
hybrid controller scheme is designed and implemented. The hybrid scheme is speed and
load dependent with hysteresis regions for stability at specific working points. The active-
ux (AF) method is implemented in the low to rated speed range at medium to rated
loads while the arbitrary injection (AI) method is implemented elsewhere. Measured
results show that the scheme is capable of position sensorless control in the entire rated
speed and load range with some limitations on dynamics.
Because of the limitations on dynamics of the hybrid scheme an assisted fundamental
model position estimation scheme was investigated. Simulation results show that this
controller requires further investigation.<br>AFRIKAANSE OPSOMMING: Die fokus in hierdie tesis is die posisie-sensorlose beheer van 'n transvers-gelamineerde
reluktansie sinchroonmasjien. Rotor posisie inligting word benodig vir geslote-lus beheer
van die reluktansie sinchroonmasjien met ho e-werkverrigting, en word normaalweg deur
onbetroubare hardeware sensors verskaf. As deel van die navorsings-termyn is 'n FPGAgebaseerde
beheerstelsel vir die masjien stelsel voltooi.
Die \aktiewe-vloed" posisie-afskattings metode is ondersoek en vir die eerste keer
ge mplementeer vir posisie-sensorlose beheer van die transvers-gelamineerde reluktansie
sinchroonmasjien. Die metode is dieselfde in konsep vir alle WS masjiene en word basseer
op die vergelyking vir wringkrag van die masjien. Vollas geslote-lus posisie-sensorlose
beheer van die masjien in die lae tot ho e spoedbereik is suksesvol ge mplementeer met
simulasie en gemete resultate. Verkskeie inherente eienskappe van die masjien het implikasies
vir gebruik van die \aktiewe-vloed" metode (insluitend generator werking) en is
dus ondersoek.
Die \arbitr^ere injeksie" metode wat afgelei is om onafhanklik van masjien parameters
te wees is ook odersoek. Hierdie metode verlang slegs 'n stroom-afgeleide by elke tydstip
en benodig dus 'n kleiner injeksie-spanning. Hierdie metode is weer ge mplementeer op die
reluktansie sinchroon masjien met suksesvolle posisie-sensorlose beheer in die hele spoed
bereik getoon in simulasie en praktiese resultate. Dit word egter getoon dat hierdie metode
slegs onder lae-las toestande posisie sensorlose beheer bo lae-spoed kan bewerkstellig.
Ten einde posisie-sensorlose beheer in die hele spoed en wringkrag bereik te verkry
is 'n nuwe hibriede beheerskema ontwerp en ge mplementeer. Die skema is spoed en
las afhanklik met histerese vir stabiliteit by 'n spesi eke werkpunt. Die \aktiewe-vloed"
metode word gebruik bo lae spoed teen 'n minimum las terwyl die \arbitr^ere injeksie"
andersins ge mplementeer word. Gemete resultate toon dat die skema posisie-sensorlose
beheer van die masjien in die hele spoed en las bereik toelaat met sommige beperkings
op dinamika.
Met inagneming van die beperkings op die hibriede metode is 'n ondersteunde fundamentele
model afskattingskema ondersoek. Simulasie resulate toon dat hierdie beheerder
verdere ondersoek benodig.
5
Godbehere, Jonathan. "Electric machine design synthesis with consideration to sensorless position control." Thesis, University of Bristol, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.730881.
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Chretien, Ludovic. "POSITION SENSORLESS CONTROL OF NON-SALIENT PERMANENT MAGNET SYNCHRONOUS MACHINE." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1145286531.
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7
van, Treek Daniel [Verfasser]. "Position Sensorless Torque Control of Switched Reluctance Machines / Daniel van Treek." Aachen : Shaker, 2012. http://d-nb.info/1069045829/34.
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Teske, Nikolas. "Sensorless position control of induction machines using high frequency signal injection." Thesis, University of Nottingham, 2001. http://eprints.nottingham.ac.uk/13117/.
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The aim of this research project was to develop a position controlled induction machine vector drive operating without a speed or position sensor but having a dynamic performance comparable to that of a sensored position vector drive. The methodology relies on the detection of a rotor saliency in the machine by persistent high-frequency voltage injection. The rotor position is then estimated from the resulting stator current harmonics that are modulated by the spatial rotor saliency. This can be a built-in rotor saliency (a designed asymmetry) or the natural saliency due to rotor slotting. This project investigates the demodulation of the extracted high-frequency current spectrum and different topologies for the estimation of rotor position. The tracking of rotor position through rotor saliencies helps to overcome the limitations of model-based approaches that are restricted to speeds above 30rpm on a 4-pole machine and are sensitive to parameter mismatches. The project addresses the difficult problem of separating the modulation effects due to the rotor saliency from distorting modulations due to the saturation saliency and inverter effects. In previous research it had been found that the saturation saliency causes a deterioration of the position estimate that can result in a loss of position and eventually causes the drive to fail. The application of filters to remove the interfering saturation harmonics is not possible. In this research a new approach was developed that compensates online for the saturation effect using pre-commissioned information about the machine. This harmonic compensation scheme was utilized for a 30kW, 4-pole induction machine with asymmetric rotor and enabled the operation from zero to full load and from standstill up to about ±150rpm (±5Hz). The steady-state performance and accuracy of the resulting sensorless drive has been found to operate similarly to a sensored drive fitted with a medium resolution encoder of 600ppr. The project involved studies of the inverter switching deadtime and its distorting effect on the position estimation. A second compensation strategy was therefore developed that is better suited if a large interfering modulation due to the inverter deadtime is present in the machine. The new compensation method was implemented for a second 30kW machine that utilizes the rotor slotting saliency. Good tracking results were obtained with a mean error of less than ±0.5° mechanical under steady-state. The derivation of the position signal for higher speeds introduces an additional speed-dependent error of about 4° mechanical at 170rpm. Sensorless position control was realized for operation from zero to full load for the fully fluxed machine. The performance allowed low and zero speed operation including position transients reaching a speed of 50rpm. The high-frequency modulation introduced by the fundamental currents during transient operation was examined and identified as the main factor limiting the dynamics of the sensorless drive. Two rigs were used for the research. The first rig is build around a network of Transputers, the second rig uses state-of-the-art TMS320C40 and TMS320F240 digital signal processors for the control and was designed and constructed as part of the research.
9
Chi, Song. "Position-sensorless control of permanent magnet synchronous machines over wide speed range." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1186974583.
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De, Kock Hugo Werner. "Position sensorless and optimal torque control of reluctance and permanent magnet synchronous machines." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1314.
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Thesis (PhD (Electric and Electronic Engineering))--University of Stellenbosch, 2009.<br>Keywords: position sensorless control, torque control, synchronous machines
The work in this thesis deals with energy e cient torque control and rotor position estimation
in the full speed range, for a family of synchronous machines that should be used more often
in the near future. This family consists of the permanent magnet synchronous machine
(PMSM), the reluctance synchronous machine (RSM), the interior-PMSM and the PMassisted-
RSM.
By designing and controlling these synchronous machines correctly, better performance and
higher energy e ciency can be expected compared to the performance and e ciency of an
industry standard induction machine. However, applications are limited to variable speed
drives (VSD) in a certain power range, e.g. below 100kW. With the growing concern and
necessity of a better utilization of energy, it is becoming standard to use electronically
controlled power converters between the electricity grid and electrical machines. Therefore,
there is a very large scope for the implementation of this synchronous machine technology.
For traction applications like electrical vehicles, the optimally controlled synchronous machine
technology has a very strong position. Very compact and robust synchronous machines
with a very high power density can be designed that may out-perform the induction machine
by far. However, one major requirement for most applications is position sensorless control,
i.e. rotor position estimation in the whole speed range.
To achieve energy e cient torque control, maximum torque per Ampere (MTPA) control
should be implemented. It is possible to achieve MTPA control at low speed, but above the
rated speed of the machine, eld weakening needs to be performed. The question is how to
implement MTPA and e ective eld weakening for any value of speed and DC bus voltage
and for any machine within this family of synchronous machines. In this thesis a method is
explained to achieve this goal using results from nite element (FE) analysis directly. The
scheme may be implemented within a very short period of time.
The contribution of this thesis is a general understanding of the problems at hand, with
an in-depth view into the mathematical representation of synchronous machines, a generic
method of energy e cient torque control and a thorough study of rotor position and speed
estimation methods.
11
Villet, Wikus Theo. "Critical evaluation and application of position sensorless control techniques for reluctance synchronous machines." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86527.
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Thesis (PhD)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: The position sensorless controllability of the reluctance synchronous machine (RSM) is investigated in
this thesis with the focus on industry applications where variable and dynamic torque is required from
startup up to rated speed. Two low speed as well as one medium to high speed position sensorless control
(PSC) method for RSMs are investigated. These methods are extended to operate in the entire rated
speed region with a hybrid PSC structure that makes use of phase locked-loop synchronisation and a
hysteresis changeover method.
It is shown in this thesis that PSC of the lateral rib rotor RSM is not possible from zero up to ± 0.2 p.u
current. It is shown through finite element (FE) simulations that PSC of the ideal rotor RSM however,
is possible at zero reference current. A novel construction method is used to build two ideal rotor RSMs.
Measured flux linkage curve results of the ideal rotor RSMs correlate well with simulation results and it
is shown that the electrical angle of the machine can be tracked successfully at zero reference current.
The FE simulation package is used to compare the saliency of the RSM on a per-unit scale to three
types of field intensified permanent magnet (FI-PM) synchronous machines and a field weakening interior
permanent magnet synchronous machine. It is shown that the saliency of the RSM is larger than that of
the investigated PM machines from zero up to rated load. It is thus concluded that the RSM is well suited
to saliency-based PSC (SB-PSC) methods, which are used to control synchronous machines at startup
and low speeds.
The hybrid PSC methods developed in this thesis, are tested and evaluated on three proposed industry
applications. The first is a reluctance synchronous wind generator with an inverter output LC filter. The
LC filter allows long cables to be used and reduces the voltage stress on the stator windings of the machine.
The combination of the LC filter and hybrid PSC method allows the power electronics and controller to
be stationed in the base of the turbine tower. A new stator quantity estimation method is derived to omit
the need of current and voltage sensors on the machine side of the LC filter. Good maximum power point
tracking laboratory results are shown with the high frequency injection-assisted hybrid PSC method.
The second application investigated is a position sensorless controlled variable gear electric vehicle
(EV) RSM drive. Simulation and measured results show good torque capabilities of the position sensorless
controlled EV RSM. It is shown through simulation results that the fundamental current harmonic is
dominant in the demodulation scheme of the high frequency injection position sensorless control (HFIPSC)
method due to the high current rating of the proposed RSM. The HFI-PSC method is extended to
reduce the effect of the fundamental current harmonic in the demodulation scheme without adding any
additional filters.
The final investigated application is a novel mine scraper winch, which uses two position sensorless
controlled RSMs to retrieve ore from the blast site underground. The new design improves on the safety,
efficiency and durability of the current scraper winch design. Measured results show that the position
sensorless controlled winch RSM is able to deliver rated startup torque with both investigated SB-PSC
methods. Finally an automation method is implemented and tested to limited the applied force on the
scraper and automatically free itself when stuck.<br>AFRIKAANSE OPSOMMING: Die posisie sensorlose beheer eienskappe van die reluktansie sinchroonmasjien (RSM) word in hierdie tesis
ondersoek met die fokus op industriële toepassings waar varierende dinamiese draaimoment vereis word
vanaf stilstand tot by ken spoed. Twee lae spoed- en een ho¨e spoed posisie sensorlose beheer (PSB)
metodes vir RSMe is ondersoek. Hierdie metodes is uitgebrei om twee hibriede PSB metodes to skep wat
die RSM van stilstand tot by kenspoed posisie sensorloos kan beheer. Die ontwikkelde hibriede metodes
maak gebruik van ’n histerese oorskakelings skema en fase geslote lus sinchronisasie
Daar word in hierdie tesis bevestig dat die laterale rib RSM nie beheer kan word met die geondersoekte
PSB metodes by nul stroom nie. Eindige element simulasie resultate wys egter daarop dat die ideale rotor
RSM wel beheer kan word met die geondersoekte metodes by nul stroom. ’n Nuwe konstruksie metode is
voorgestel om twee ideale rotor RSMe to bou. Gemete vloed omsluiting kurwes resultate korreleer baie
goed met dié van die eindige element simulasies. Gemete resultate wys ook daarop dat PSB van die nuwe
masjiene moontlik is by nul stroom.
’n Eindige element pakket is gebruik om die speek-koëffissiënt van die RSM te vergelyk met drie tipes
veld-versterkte permanent magneet masjiene, asook een veld verswakte permanent magneet versinkte
masjien. Die simulasie resultate wys dat die RSM se speek-koëffissiënt hoër is as die van die geondersoekte
permanent magneet masjiene. Die RSM is dus geskik vir speek-koëffissiënt georienteerde PSB metodes,
wat hoofsaaklik by stilstand en lae spoed gebruik word.
Die ontwikkelde hibried PSB metodes is getoets en geëvalueer met drie voorgestelde industriële toepassings.
Die eerste is ’n reluktansie sinchroon wind generator met ’n omsetter uittree laagdeurlaat filter. Die
laagdeurlaat filter laat toe dat langer kabels vanaf die omsetter na die generator gebruik kan word. Die
kombinasie van die laagdeurlaat filter en die PSB metodes laat toe dat die drywingselektronika en die
beheerders in die toring basis geplaas kan word. Dit kan die gewig van die nasel verminder. Goeie maksimum
drywingspunt volging laboratorium resultate word getoon met die hoë frekwensie ondersteunde
hibried PSB metode.
Die tweede geondersoekte toepassing is ’n posisie sensorlose beheerde, varierende ratkas elektriese
voertuig RSM. Goeie simulasie en gemete draaimoment resultate van die RSM word getoon. Simulasie
resultate toon dat die fundamentele q-as stroom harmoniek dominant is in die demodulasie skema van
die hoë frekwensie PSB metode, as gevolg van die hoë ken stroom van die motor. Die hoë frekwensie
PSB metode is uitgebrei om die fundamentele stroom harmoniek te onderdruk in die demodulasie skema
sonder om enige filters by te voeg.
Die finale toepassing is ’n nuwe myn windas wat van twee posisie sensorlose beheerde RSMe gebruik
maak om klippe ondergronds te verplaas vanaf die ontploffings area. Die voorgestelde ontwerp verbeter die
huidige ontwerp ten opsigte van die veiligheid, energie effektiwiteit en robuustheid. Gemete resultate wys
dat ken draaimoment moontlik is met altwee speek-koëffissiënt metodes. ’n Automasie metode, wat die
maksimum draaimoment op die windas beperk en automaties homself bevry indien hy vasval, is voorgestel
en geëvalueer.
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Smuts, Johan L. (Johan Leodolf). "Critical evaluation of a position sensorless control technique for the reluctance synchronous machine drive." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/70135.
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Thesis (MScEng)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: The aim of this study is to critically evaluate the voltage injection position sensorless
control technique as applied to the reluctance synchronous machine (RSM) drive and
to implement the technique on a 5.5 kW RSM and a 110 kW RSM. The technique is
evaluated by using an accurate mathematical model of the RSM in a simulation
package, called Simuwin. The negative effects that cross-magnetisation and the
slotted air-gap have on the technique are intensively investigated. It was showed that
these effects can cause an error in the position estimation of up to 30°. The
TMS320F240 DSP was used as the controller for the RSM drives to implement the
position sensorless control technique. Measurements on both RSM drives confirm the
simulated results.<br>AFRIKAANSE OPSOMMING: Die doel van hierdie tesis is om die spannings-injeksie posisie sensorlose beheer
tegniek soos toegepas op die reluktansie sinchroon masjien (RSM) aandryfstelsel,
krities te evalueer en te implementeer op 'n 5.5 kW RSM en op 'n 110 kW RSM. Die
tegniek is geevalueer deur 'n akkurate wiskundige model van die RSM saam te stel en
die model te gebruik in 'n simulasie pakket, genaamd Simuwin. Daar is veral klem
gele op die negatiewe invloed wat kruis-magnetisering en 'n gegleufde lug-spleet op
die tegniek het. Dit is bewys dat hierdie eienskappe van die RSM 'n fout in die posisie
afskatting van tot 30° kan veroorsaak. Die TMS320F240 DSP is gebruik as beheerder
vir die RSM aandryfstelsels om sodoende posisie sensorlose beheer op altwee
masjiene toe te pas. Metings op albei stelsels bevestig die simulasies.
13
Zhang, Jinhui. "ELIMINATING THE POSITION SENSOR IN A SWITCHED RELUCTANCE MOTOR DRIVE ACTUATOR APPLICATION." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_diss/343.
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The switched reluctance motor (SRM) is receiving attention because of its merits: high operating temperature capability, fault tolerance, inherent shoot-through preventing inverter topology, high power density, high speed operation, and small rotor inertia. Rotor position information plays a critical role in the control of the SRM. Conventionally, separate position sensors, are used to obtain this information. Position sensors add complexity and cost to the control system and reduce its reliability and flexibility. In order to overcome the drawbacks of position sensors, this dissertation proposed and investigated a position sensorless control system that meets the needs of an electric actuator application. It is capable of working from zero to high speeds. In the control system, two different control strategies are proposed, one for low speeds and one for high speeds. Each strategy utilizes a state observer to estimate rotor position and speed and is capable of 4 quadrant operation. In the low speed strategy a Luenberger observer, which has been named the inductance profile demodulator based observer, is used where a pulse voltage is applied to the SRMs idle phases generating triangle shaped phase currents. The amplitude of the phase current is modulated by the SRMs inductance. The current is demodulated and combined with the output of a state observer to produce an error input to the observer so that the observer will track the actual SRM rotor position. The strategy can determine the SRMs rotor position at standstill and low speeds with torques up to rated torque. Another observer, named the simplified flux model based observer, is used for medium and high speeds. In this case, the flux is computed using the measured current and a simplified flux model. The difference between the computed flux and the measured flux generates an error that is input to the observer so that it will track the actual SRM rotor position. Since the speed ranges of the two control stragegies overlap, the final control system is capable of working from zero to high speed by switching between the two observers according to the estimated speed. The stability and performance of the observers are verified with simulation and experiments.
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Bu, Jianrong. "High performance rotor position sensorless control of switched reluctance machines over a wide speed range /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487949836205613.
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Stalter, Olivier. "Inverter-integrated, sensorless and power-optimized position control of a concentrating photovoltaic dual-axis tracker." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0186.
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L’intérêt du photovoltaïque à concentration (CPV) réside autant dans le faible volume de semi-conducteur que dans le fort rendement des cellules solaires III-V. Toutefois, du fait du dispositif optique, un positionnement mécanique très précis du générateur CPV via un traqueur solaire à deux axes de rotation est nécessaire. La première partie du travail de thèse consista à développer un onduleur hybride ou « Tracking Inverter » capable d’injecter le courant produit par un traqueur CPV tout en réalisant son positionnement. La seconde partie consista à implémenter les procédés de tracking classiques (capteur solaire, calcul astronomique ou hybride) afin d’évaluer leurs performances et leurs limites. Enfin, la réalisation majeure de la thèse fût le développement d’un nouveau procédé de tracking sans capteur et basé sur la puissance électrique de l’onduleur. La précision, la sensibilité et la fiabilité du Mechanical Maximum Power Point Tracker (MPPTm) en modes dégradés vinrent clore l’étude.
16
Huang, Ming Chuan. "Comparison of shaft position estimation and correction techniques for sensorless control of surface mounted PM synchrononous motors." Thesis, Cardiff University, 2009. http://orca.cf.ac.uk/54888/.
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This thesis is a detailed study of how two error correction schemes affect the precision of shaft position estimation in state-observer techniques for sensorless control surface-mounted Permanent Magnet Synchronous Motors (PMSM), variance correction and variable PI regulation. A novel sensorless estimation technique based on Linear Kalman Filter (LKF) through constant variance correction is proposed and compared with the conventional Flux Linkage Observer (FLO) method and other state-estimation sensorless control techniques namely, Extended Kalman Filter (EKF), variable variance correction, Single Dimension Luenberger (SDL) observer and Full-Order Luenberger (FOLU) observer both through variable PI regulation. These five sensorless control techniques for PMSM are successfully implemented in the same lab-based hardware platform, i.e. full digital float-point-type DSP control inverter-fed PMSM system. Experiments are reported on each sensorless method covering position estimation, speed response, self-startup and load behaviour. Intensive analysis has also been carried out on the impact of error correction of estimated position on the steady/dynamic PMSM characteristics with different sensorless approaches. The experiment demonstrates that the novel Linear Kalman Filter can achieve the minimum average position estimation error throughout the electrical cycle of the five sensorless estimation techniques during no load operation at rated speed and also makes PMSM capable of self-startup for any initial rotor position except the dead area. A speed response experiment for LKF shows that individual speed estimation can be extracted directly from LKF state estimation for sensorless control PMSM. Experiments on the five sensorless methods proves that position error correction scheme is the dominating factor for state estimation sensorless control PMSM and better dynamic/steady control performance can be achieved using a variance correction scheme applied in EKF/LKF than with variable PI regulation applied in SDL/FOLU. The thesis also concludes that the novel Linear Kalman Filter is an optimised cost-effective sensorless estimation method for the PMSM drive industry compared with classic and Flux Linkage observers/Extended Kalman Filters.
17
Ralev, Iliya [Verfasser], Doncker Rik W. [Akademischer Betreuer] de, and Ralph [Akademischer Betreuer] Kennel. "Accurate torque control of position sensorless switched reluctance drives / Iliya Valentinov Ralev ; Rik W. de Doncker, Ralph Kennel." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1193734649/34.
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Piňos, Matěj. "Bezsensorové řízení polohy solenoidu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318655.
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This thesis deals with position control of movable solenoid core without using a distance sensor. There are several methods of sensorless position estimation presented in theoretical part. The method based on measurement of ripple current is chosen for experiments. Firstly, it is verified by simulations with mathematical model of solenoid. After that, the experiment is created. The goal is position control based on sensorless method.
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Pasquesoone, Gregory. "Controls for High Performance Three-Phase Switched Reluctance Motors." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1310874393.
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Ronquist, Anton, and Birger Winroth. "Estimation and Compensation of Load-Dependent Position Error in a Hybrid Stepper Motor." Thesis, Linköpings universitet, Reglerteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129554.
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Hybrid stepper motors are a common type of electric motor used throughout industry thanks to its low-cost, high torque at low speed and open loop positioning capabilities. However, a closed loop control is often required for industrial applications with high precision requirements. The closed loop control can also be used to lower the power consumption of the motor and ensure that stalls are avoided. It is quite common to utilise a large and costly position encoder or resolver to feedback the position signal to the control logic. This thesis has explored the possibility of using a low-cost position sensor based on Hall elements. Additionally, a sensorless estimation algorithm, using only stator winding measurements, has been investigated both as a competitive alternative and as a possible complement to the position sensor. The thesis work summarises and discusses previous research attempts to adequately measure or estimate and control the hybrid stepper motors position and load angle without using a typical encoder or resolver. Qualitative results have been produced through simulations prior to implementation and experimental testing. The readings from the position sensor is subject to noise, owing to its resolution and construction. The position signal has been successfully filtered, improving its accuracy from 0.56° to 0.25°. The output from the sensorless estimation algorithm is subject to non-linear errors caused by errors in phase voltage measurements and processing of velocity changes. However, the dynamics are reliable at constant speeds and could be used for position control.
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Soviš, Jiří. "Bezsnímačové řízení střídavých motorů na platformě STM32." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442463.
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The thesis is focused on the issue of sensorless vector control of a synchronous motor with permanent magnets in the low-speed range. In the first part, there is a brief description of the synchronous motor and the necessary transformations for the application of vector control. This is followed by the overview of sensorless methods for position estimation by injecting a high-frequency harmonic signal. The practical part is devoted to the implementation of a control algorithm to develop kit STM32NUCLEO-L476RG, which is preceded by the identification of all engine parameters. As part of the implementation, a structure including current, speed and position control was designed. The functionality and robustness of the settings have been successfully tested due to the different inertia and load.
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Keprt, Jaroslav. "Bezsensorové polohové řízení solenoidu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241834.
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This thesis deals with the determination of the position of the solenoid core in real time based on the measured current. The reference position of the current is used for feedback control of the solenoid. For this issue, software tool Matlab/Simulink was used. For current and temperature measurements, PCB circuits were created. The whole project was carried out on the dSPACE platform.
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Zhao, Shuang. "Analysis and Control Aspects of a PMSynRel Drive in a Hybrid Electric Vehicle Application." Doctoral thesis, KTH, Elektrisk energiomvandling, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-139592.
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This thesis deals withmodeling and control of an electric drive equipped with a permanentmagnet assisted synchronous reluctance (PMSynRel) machine for a plug-in hybrid electric vehicle application. In the first part of the thesis, a special use of the PMSynRel machine in consideration, known as an integrated charger concept, is investigated. The integrated charger feature allows using the PMSynRel machine as a part of the vehicle’s on-board charging system when charging the battery from the grid. A finite-element based analysis is performed providing important insights into the machine operation during the charging process. Dynamic models are developed that facilitate the controller development and the estimation of the efficiency during charging. In the second part of the thesis, position sensorless control of the PMSynRel drive when applied in an automotive application is considered and analyzed thoroughly. First, a fundamental-excitation based rotor-position estimation technique is investigated. The study shows that the impact of current dynamics on the resulting torque dynamics has to be considered in some very demanding applications. Second, focus is put on signalinjection based sensorless control methods. Impacts of nonlinearities, such as magnetic saturation, cross-saturation and inductance spatial harmonics, on sensorless control performance are investigated and methods to improve the sensorless control quality are summarized and presented. An approach to determine the feasible region for operating sensorless at low-speeds without directly measuring the differential inductances is proposed. For the PMSynRel drive in consideration, the achievable maximum torque is limited when operating sensorless following the maximum-torque-per-ampere (MTPA) current reference trajectory at low-speeds. An optimization approach is therefore proposed which extends the output torque when operating sensorless while still maintaining a relatively high efficiency. To initialize the sensorless control correctly from standstill, the impact of the saturated magnetic bridges in the rotor is also investigated. Finally, torsional drive-train oscillations and active damping schemes are considered. An off-vehicle setup for implementing and evaluating different active damping schemes is proposed. Of particular interest for sensorless operation in automotive applications, the impact of slow speed estimation on the possibility to achieve good active damping control is investigated and a design approach that allows the implementation of an active damping scheme using estimated speed is suggested.<br><p>QC 20140114</p>
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Bouwer, Pieter. "Modelling, design and implementation of a small-scale, position sensorless, variable speed wind energy conversion system incorporating DTC-SVM of a PMSG drive with RLC filter." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80242.
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Thesis (MScEng)--Stellenbosch University, 2013.<br>Wind energy has proven to be a viable source of clean energy, and the worldwide
demand is growing rapidly. Variable speed topologies, with synchronous generators
and full-scale converters, are becoming more popular, and the e ective control of these
systems is a current trend in wind energy research.
The purpose of this study is the modelling, design, simulation and implementation
of a small-scale, variable speed wind energy conversion system, incorporating the position
sensorless direct torque control with space vector modulation, of a permanent
magnet synchronous generator, including an RLC converter lter. Another aim is the
development of a gain scheduling algorithm that facilitates the high level control of the
system.
Mathematical models of the combined lter-generator model, in the stationary and
rotating reference frames, are presented and discussed, from which equivalent approximate
transfer functions are derived for the design of the controller gains.
The design of the controller gains, RLC lter components, gain scheduling concept
and maximum power point tracking controller are presented. It is discovered that the
RLC lter damping resistance has a signi cant e ect on the resonance frequency of the
system.
The system is simulated dynamically in both Simulink and the VHDL-AMS programming
language. Additionally, the maximum power point tracking controller is
simulated in the VHDL-AMS simulation, including a wind turbine simulator. The
simulation results demonstrate good dynamic performance, as well as the variable
speed operation of the system.
The practical results of torque and speed controllers show satisfactory performance,
and correlate well with simulated results. The detailed gain scheduling algorithm is
presented and discussed. A nal test of the complete system yields satisfactory practical
results, and con rms that the objectives of this thesis have been reached.
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Goksu, Omer. "Shaft Transducerless Vector Control Of The Interior Permanent Magnet Motor With Speed And Position Estimation Using High Frequency Signal Injection And Flux Observer Methods." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609617/index.pdf.
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In this thesis, shaft transducerless vector control of Interior Permanent Magnet (IPM) motor with speed and position estimation using saliency based high frequency signal injection and fundamental model based flux observer methods will be investigated. The magnetic saliency characteristic of a 2.2-kW IPM motor will be experimentally extracted by means of high frequency signal injection. High frequency signal injection method will be used to estimate the speed and position at zero and low speed based on the magnetic saliency of the IPM motor. At high speed, fundamental model based flux observer method will be utilized for speed and position estimation. Seamless transition between the two estimation methods will be provided. Using the estimated speed and position information, the motor will be closed loop vector controlled and the drive motion performance over wide speed and load range will be investigated. The IPM motor drive and the estimation/control algorithms will be modeled and their performance will be demonstrated by detailed computer simulations. A three-phase voltage source inverter and a motor test bench will be built, and the estimation/control algorithms will be implemented on a DSP based motor control platform. The IPM motor drive system will be tested in the laboratory and the theory and simulation results will be verified by the experiments.
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Moravec, Vojtěch. "Odhad polohy rotoru PMSM pomocí VF signálu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-240847.
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This thesis is focused on the design of vector control of interior permanent magnet synchronous motors. The first part of this work deals with vector control transformations and mathematical modelling of synchronous motors. Furthermore, algorithms of sensorless control are discussed, especially HF injection sensorless methods. One of these methods was used for torque and speed control. Problem of phase delay caused by filters and it’s compensation is also discused. One of the HF injection sensorless method was implemented on both motors. The results of simulations in MATLAB/Simulink and tests of real motors on dSpace are included.
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Malekipour, Amirhossein. "Contrôle sans capteur basé sur le bruit acoustique d'une Machine Synchrone à Aimants Permanents." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALT084.
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Un nouveau système de contrôle sans capteur pour les machines synchrones à aimants permanents (MSAP), qui repose sur l'extraction de l'information de position du rotor à partir du bruit acoustique généré lors du fonctionnement, est présenté dans cette thèse. La thèse examine en détail la nature des champs d'entrefer électromagnétiques, des forces radiales d'entrefer, ainsi que des vibrations et du bruit acoustique d'origine électromagnétique qui en résultent.Cette thèse propose deux nouveaux algorithmes sans capteur sont utilisant soit l'injection sinusoïdale à haute fréquence (IHF) habituelle, soit des impulsions de tension PWM intégrées. Pour extraire l'information de position du rotor, la thèse introduit des algorithmes de traitement du signal appropriés. Bien que les signaux souhaités soient correctement extraits lors de l'étape de traitement du signal, des harmoniques supplémentaires apparaissent dans la vitesse et la position estimées. Pour résoudre les problèmes qui en découle, la thèse propose deux observateurs novateurs, appelés RCPLL et ADALINE-PLL.En conclusion, la stabilité, la robustesse et la fiabilité des algorithmes sans capteur proposés sont étayées par des tests expérimentaux réalisés à travers divers points de fonctionnement statiques et dynamiques. De plus, la performance au démarrage est comparée à celle des algorithmes sans capteur conventionnels, révélant des réponses similaires et satisfaisantes en régime permanent et en transitoire. Ces résultats indiquent fortement la fiabilité et l'efficacité des méthodes sans capteur proposées<br>A new sensorless control system for Permanent Magnet Synchronous Machines (PMSM), based on extracting rotor position information from the acoustic noise generated during operation, is presented in this thesis. The thesis extensively examines the nature of electromagnetic air-gap fields, radial air-gap forces, as well as the vibrations and electromagnetic-origin acoustic noise resulting from them.This thesis introduces two new sensorless algorithms, using either the usual high-frequency sinusoidal injection (HFI) or integrated PWM voltage pulses. To extract rotor position information, the thesis introduces appropriate signal processing algorithms. Although the desired signals are correctly extracted during the signal processing step, additional harmonics appear in the estimated speed and position. To address the resulting issues, the thesis proposes two innovative observers called RCPLL and ADALINE-PLL.In conclusion, the stability, robustness, and reliability of the proposed sensorless algorithms are supported by experimental tests conducted across various static and dynamic operating points. Furthermore, the startup performance is compared to that of conventional sensorless algorithms, revealing similar and satisfactory responses in steady-state and transient conditions. These results strongly indicate the reliability and efficiency of the proposed sensorless methods
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Ozturk, Salih Baris. "Direct torque control of permanent magnet synchronous motors with non-sinusoidal back-EMF." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2728.
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Beciu, Andreea-Livia. "Commande robuste à haute performance sans capteur de position d'alterno-démarreurs à grande vitesse avec un fort couple à l'arrêt pour les avions plus électriques." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC078.
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Les avionneurs expriment le besoin de développement de l’avion plus « électrique ». Cela se traduit par des besoins nouveaux en matière de systèmes de motorisation électrique, en termes de puissance à fournir et de partage de ressources matérielles en vue de minimiser la masse embarquée et les coûts. Parmi les études en cours sur l’évolution des machines tournantes, un intérêt particulier porte sur le développement des alterno-démarreurs de type machines synchrones sans balais et à plusieurs étages (BSSG). Celles-ci sont susceptibles de fournir un fort couple lors des phases de démarrage des réacteurs auxquelles elles sont associées. Pour ce faire, la connaissance, à tout moment, de la position du rotor est essentielle. Cependant, l'ajout d’un capteur dédié impacte la conception de la machine, rajoutant du volume, du câblage et augmentant le coût. La réalisation d'une commande dite « sensorless » permettrait de s'affranchir de l'utilisation d'un tel capteur et de simplifier le design des alterno-démarreurs.A partir d'une modélisation fine de la machine, cette thèse étudie les conditions dans lesquelles une telle commande est réalisable et analyse plusieurs techniques permettant d'y parvenir. Une nouvelle méthode d'estimation de la position du rotor, spécifique aux BSSG est proposée, puis illustrée avec des résultats expérimentaux. Cette technique est basée sur le traitement des composantes harmoniques existantes naturellement au stator de la machine et permet l'estimation de la position à l'arrêt et à très basse vitesse. Afin d'étendre l'estimation sur toute la plage de vitesse, une étude d'estimation de position par un observateur d'état à base du modèle complet de la machine en considérant les harmonique injectés (ou existantes) dans les courants du stator est proposée. Cet observateur peut s’appliquer à la machine synchrone à trois étages mais aussi à toute machine synchrone. Dans cette étude, son fonctionnement est illustré sur une machine synchrone à aimants permanents<br>The aircraft manufacturers express the need to develop a more "electric" aircraft. This brings forward new requirements for the electric drive systems in terms of increasing the available on-board power and resource sharing in order to optimize the overall mass and cost. Among the ongoing studies on the evolution of motor drives, a particular interest is given to the development of multi-level brushless synchronous starter/generators (BSSG). These drives are likely to provide the high torque required to start-up the reactors to which they are associated. For this purpose, the knowledge, at any time, of the rotor position is essential. However, adding a dedicated sensor impacts on the design of the machine, increasing volume, cabling needs and cost. For this purpose, investigating on “sensorless” control laws will permit to avoid using such a sensor and to simplify the design of the Starter/Generators.Using a fine modelling of the machine, this work studies the conditions of feasibility for sensorless control and analyzes several techniques for this purpose. A new method of estimation of the shaft-position, particular to the BSSG architecture is proposed and then illustrated with experimental results. This technique is based on the processing of the existing harmonic components naturally in the stator of the machine and allows the estimation of the position at standstill and the very low speed. To extend the estimation to the whole speed range, a study of position estimation using a state observer using the complete model of the machine considering the knowledge of the existing (or injected) harmonic components in the stator currents is proposed. This observer can be applied to the brushless synchronous starter/generator but also on generic synchronous machines. In this study, its performance is illustrated on a permanent magnet synchronous machine
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Zaim, Sami. "Contribution à la commande sans capteur mécanique d' actionneurs électriques motorisés par des machines synchrones à aimants permanents." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0134/document.
Full textAbstract:
Grace à leur forte densité de puissance et leur facilité de commande, les machines synchrones à aimants permanents (MSAP) sont fréquemment utilisées pour motoriser les actionneurs aéronautiques. Afin de pouvoir assurer le pilotage de ces moteurs, une information précise sur la position du rotor est nécessaire. Des capteurs de position sont utilisés pour mesurer la position et calculer la vitesse du rotor. Les inconvénients inhérents à l'utilisation de ces capteurs sont la diminution de la fiabilité du système et l'augmentation du poids, du volume, et du coût total du celui-ci. Dans ce travail, nous présentons une commande ne nécessitant pas le capteur de position à l'aide d'algorithmes d'estimation des variables mécaniques uniquement à partir de la mesure des courants statoriques. Après avoir abordé les méthodes de commande sans capteur adaptées aux hautes vitesses et basées sur l'estimation de la force électromotrice, nous établissons un état de l'art des méthodes de contrôle à basses vitesses basées sur la saillance du rotor. Une nouvelle méthode de commande sans capteur en basses vitesses et à l'arrêt, indépendante des paramètres du moteur et très simple à implanter est ensuite proposée et validée en simulation (sur un modèle de MSAP prenant en compte les effets de saturation) puis sur banc d'essais. Une étude analytique sur la convergence de l'algorithme et sa robustesse est également réalisée. Enfin, un processus d'initialisation ainsi qu'une méthode de transition sans à-coups entre les méthodes basses et hautes vitesses sont proposées et validées par simulation et expérimentation<br>For their high power density and ease of control, permanent magnet synchronous motors (PMSM) are widely used in more electric aircraft. In order to control PMSMs, precise information on the rotor position is required. This information is provided by position sensors which have inherent drawbacks despite their good precision: these sensors decrease reliability and increase weight, volume, and cost of the whole system. In this thesis, we present a mechanical sensorless control method by estimating the rotor speed and position only from the phase currents measurements. Sensorless control methods suitable for high speeds and based on back-EMF estimation are first discussed. Then, a state of the art in sensorless methods for low speeds operations is presented. A new sensorless control, independent from the motor parameters, is presented for operating at low speeds and standstill. Both simulations (on a PMSM model taking into account the saturation phenomenon) and experimental results show the effectiveness of this model-independent method. A convergence analysis and a robustness study of the proposed algorithm are also made. Finally, an initialization process and a method for smooth transition between low and high speeds methods are proposed and validated on an experimental test-bench
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Zaim, Sami. "Contribution à la commande sans capteur mécanique d' actionneurs électriques motorisés par des machines synchrones à aimants permanents." Electronic Thesis or Diss., Université de Lorraine, 2013. http://www.theses.fr/2013LORR0134.
Full textAbstract:
Grace à leur forte densité de puissance et leur facilité de commande, les machines synchrones à aimants permanents (MSAP) sont fréquemment utilisées pour motoriser les actionneurs aéronautiques. Afin de pouvoir assurer le pilotage de ces moteurs, une information précise sur la position du rotor est nécessaire. Des capteurs de position sont utilisés pour mesurer la position et calculer la vitesse du rotor. Les inconvénients inhérents à l'utilisation de ces capteurs sont la diminution de la fiabilité du système et l'augmentation du poids, du volume, et du coût total du celui-ci. Dans ce travail, nous présentons une commande ne nécessitant pas le capteur de position à l'aide d'algorithmes d'estimation des variables mécaniques uniquement à partir de la mesure des courants statoriques. Après avoir abordé les méthodes de commande sans capteur adaptées aux hautes vitesses et basées sur l'estimation de la force électromotrice, nous établissons un état de l'art des méthodes de contrôle à basses vitesses basées sur la saillance du rotor. Une nouvelle méthode de commande sans capteur en basses vitesses et à l'arrêt, indépendante des paramètres du moteur et très simple à implanter est ensuite proposée et validée en simulation (sur un modèle de MSAP prenant en compte les effets de saturation) puis sur banc d'essais. Une étude analytique sur la convergence de l'algorithme et sa robustesse est également réalisée. Enfin, un processus d'initialisation ainsi qu'une méthode de transition sans à-coups entre les méthodes basses et hautes vitesses sont proposées et validées par simulation et expérimentation<br>For their high power density and ease of control, permanent magnet synchronous motors (PMSM) are widely used in more electric aircraft. In order to control PMSMs, precise information on the rotor position is required. This information is provided by position sensors which have inherent drawbacks despite their good precision: these sensors decrease reliability and increase weight, volume, and cost of the whole system. In this thesis, we present a mechanical sensorless control method by estimating the rotor speed and position only from the phase currents measurements. Sensorless control methods suitable for high speeds and based on back-EMF estimation are first discussed. Then, a state of the art in sensorless methods for low speeds operations is presented. A new sensorless control, independent from the motor parameters, is presented for operating at low speeds and standstill. Both simulations (on a PMSM model taking into account the saturation phenomenon) and experimental results show the effectiveness of this model-independent method. A convergence analysis and a robustness study of the proposed algorithm are also made. Finally, an initialization process and a method for smooth transition between low and high speeds methods are proposed and validated on an experimental test-bench
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Bruguier, Cyrille. "Commande d'une machine synchrone à aimants sans capteur mécanique." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0133.
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Les machines synchrones à aimants permanents sont de plus en plus utilisées dans les applications de petites et moyennes puissances. Dans les techniques de commande les plus répandues de ces machines, la position rotorique doit être connue. Les capteurs utilisés sont coûteux et posent des problèmes de fiabilité, de maintenance ou d'encombrement. Notre travail a porté sur la définition, l'étude (analytique et en simulation) et la mise en oeuvre expérimentale d'estimatives numériques de vitesse et position. Ces estimations sont basés sur les mesures de courants de phase et des grandeurs de commandes projetées dans un repère tournant estimé. Les composantes du vecteur courant sont reconstituées à partir des équations électriques de la machine et comparées aux courants mesurés. Les erreurs obtenues sont fonction de l'erreur de position et de vitesse entre le repère estimé et le repère tournant lié au rotor. Ces erreurs sont asservies à zéro grâce à des correcteurs dont les sorties sont la vitesse et la position estimée. Sauf à très basse vitesse, les résultats obtenus sont très satisfaisants et comparables à ceux obtenus avec un capteur mécanique. Une première structure spécifique aux basses vitesses est proposée ainsi qu'une méthode permettant de connaître la position à l'arrêt
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Abdellatif, Meriem. "Continuité de service des entraînements électriques pour une machine à induction alimentée par le stator et le rotor en présence de défauts capteurs." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0107/document.
Full textAbstract:
Le développement de commandes en boucle fermée pour des entraînements électriques nécessite l'installation de capteurs pour avoir l'information de la rétroaction. Cependant, un éventuel défaut survenant sur l'un des capteurs installés (de courant, de vitesse/position,…) implique un disfonctionnement de la commande conduisant dans la plupart du temps à la mise hors service du système. Ces conséquences sont contraires aux exigences des industriels qui demandent des degrés de fiabilité du système de plus en plus élevés. Des statistiques montrent que le défaut capteur est fréquent. Il est donc impératif de trouver des solutions pour assurer la continuité de service des systèmes électriques dans le cas de présence de ce type de défaut. Tout d'abord, l'étude présentée dans ce manuscrit présente les technologies des différents capteurs installés et ce pour comprendre les raisons et le type de pannes qui pourraient survenir. Ensuite, le système sur lequel la validation des algorithmes développés est décrit. Il s'agit d'un entraînement électrique basé sur une machine à Double Alimentation (MADA) fonctionnant en mode moteur et connectée au réseau via deux convertisseurs. La commande associée est une Commande Directe de Couple (CDC). Elle est validée en mode sain aussi bien par simulation qu'expérimentalement. Après, les études réalisées prennent en considération les défauts capteurs de courants alternatifs et de vitesse/position. Les algorithmes développés, permettant une continuité de service, utilisent une redondance analytique et sont basés sur l'estimation et aussi sur la Détection et l'Isolation d'un éventuel Défaut (DID). Ils sont caractérisés par leur simplicité. Aussi, ils ne sont pas gourmands en termes de consommation en ressources matérielles et leur temps d'exécution est très court. Enfin, la validation expérimentale de ces algorithmes montre bien leur efficacité en cas de défaut, vu que le système s'avère insensible au défaut et continue à fonctionner sans interruption. La commande obtenue est alors tolérante aux défauts capteurs<br>The development of closed loop controls for electrical drives requires the sensor installations in order to get feed back information. Nevertheless, any occurred sensor fault (current sensor,speed/position sensor,…) shows an operation system deterioration which leads in most cases to its shut down. This consequence is in contrast to industrial expectations especially concerning the system high accuracy that they are asking for. Statistic studies point out the sensor faults as frequent. So, it is necessary to find out solutions ensuring the system service continuity in case of any sensor fault. Firstly, the study presented in this work shows the used sensor technologies in order to understand both of the reason and the kind of occurred faults. Secondly, the studied system is presented which is an electrical drive based on a Doubly Fed Induction Machine (DFIM) operating in motor mode and connected to the grid by two inverters. The control developed is a Direct Torque Control (DTC). The control validation, in healthy operating mode, is realised throw simulation and experimentally. After, a study considering alternative current sensor and speed/position sensor faults are achieved. The developed algorithms are based on signal estimation, on a Fault Detection Isolation (FDI) and reconfiguration algorithms. In fact, they are simple to carry out, they don't need much hardware resources for implementation and their execution time is short. Finally, the experimental validation of the developed algorithms shows their efficiency. The system continues working even in presence of a sensor fault. Thus, the obtained control becomes a fault tolerant control thanks to these algorithms
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Tonin, Rodrigo Gehrke. "Controle de corrente aplicado a conversores PWM conectados à rede elétrica sem sensor de tensão CA utilizando observadores de corrente por modos deslizantes." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/8554.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This master thesis presents a current sliding mode observer for voltage sensorless
grid connected converters. To perform the grid synchronization a sliding mode current
observer in stationary axes αβ is proposed. Aiming its implementation in digital signal
processors or microcontroller both the synchronism and control are developed in discrete
time domain. Firstly the line currents are measured, then the transformation to stationary
axes is carried out and the sliding mode current observer is proposed. Based on
a Fortescue discrete component theory an algorithm to separation of sequence positive
phase is proposed aiming to obtained the positive grid angular position to realized the
synchronous coordinates axes transformation. The current control is carried out by two
PI controllers designed in a discrete time domain. The good performance of the proposed
method is proven through the simulation and experimental results.<br>Esta dissertação apresenta o controle de corrente em eixos síncronos de conversores
conectados a rede de energia elétrica sem o uso de sensores de tensão de linha. Para realizar
o sincronismo com a rede elétrica é proposto um observador de corrente por modos
deslizantes em eixos de coordenadas estacionárias αβ. Tanto o controle como o sincronismo
são desenvolvidos em tempo discreto visando sua implementação em processador
digital de sinais ou microcontrolador. Primeiramente são medidas as correntes de duas
fases do sistema, então é realizada a transformação para eixos estacionários e proposto o
observador de corrente por modos deslizantes. Com o auxílio de um algoritmo baseado
na teoria das componentes discretas de Fortescue para a separação de sequência de fase
positiva, é obtida posição angular elétrica da rede visando a transformação para eixos de
coordenadas síncronas. O controle das correntes é realizado através de dois controladores
PI projetados em tempo discreto. Através de resultados de simulação e experimentais
obtidos é comprovado o bom desempenho do método proposto.
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Khlaief, Amor. "Contribution à la commande vectorielle sans capteur mécanique des machines synchrones à aimants permanents (MSAP)." Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00814276.
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Ce travail de recherche s'intéresse à la commande sans capteur mécanique du moteur synchrone à aimants permanents (MSAP) à pôles saillants, particulièrement en basse vitesse, avec détection de la position initiale du rotor. Après une présentation des techniques et approches qui ont initié nos travaux, en terme d'estimation de la vitesse et/ou de la position, nous avons choisi celles qui présentent plus d'intérêt de point de vue stabilité, robustesse, précision et simplicité d'implémentation. La première approche est basée sur le Système Adaptatif avec Modèle de Référence (MRAS). Quant à la deuxième, elle est réalisée autour d'un observateur non-linéaire pour l'estimation de la position et de la vitesse du MSAP à pôles saillants. Les deux techniques d'observation de la vitesse sont associées à une commande par orientation du flux rotorique avec la technique MLI vectorielle. Pour détecter la position initiale du rotor, nous avons utilisé une nouvelle approche qui permet d'estimer cette position avec une incertitude de 5° mécanique. Cette nouvelle approche est basée sur l'application de signaux tests aux bornes des phases statoriques du MSAP. Des résultats de simulation et expérimentaux sont présentés tout au long de ces travaux pour valider les études théoriques de la commande vectorielle sans capteur mécanique du MSAP. Enfin, nous avons étudié et analysé les performances de la commande tolérante aux défauts sans capteur mécanique du MSAP en présence de défaillances de types transistors à l'état-off. Les résultats expérimentaux obtenus avec les deux approches d'estimation de la vitesse en utilisant l'observateur MRAS et un observateur non linéaire ont permis d'améliorer la fiabilité du système de manière à rendre possible la commande vectorielle sans capteur mécanique en mode dégradé (alimentation avec deux bras de l'onduleur). En effet, les résultats de la commande sans capteur mécanique de la MSAP en mode dégradé montrent que l'observateur non linéaire est le mieux adapté pour ce type de fonctionnement car il présente de faible ondulation du couple et de vitesse. A l'aide d'un banc d'essais que nous avons développé au laboratoire LSIS-pôle Ecole Centrale de Marseille (ECM), nous avons pu valider expérimentalement les différentes approches proposées dans ce travail de recherche. Les résultats obtenus montrent l'efficacité des techniques mises en œuvre pour la commande vectorielle sans capteur mécanique du MSAP à pôle saillant en termes de robustesse, stabilité, précision et rapidité.
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Chang, Da-Kai, and 張大開. "Initial Position Estimation for BDCM Position Sensorless Control." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/63761246840046016604.
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碩士<br>國立交通大學<br>電控工程研究所<br>103<br>BDCM position sensorless control is common in the low-cost applications. When the motor starts, the motor may run in the reverse direction. Some applications don’t allow this condition. We need to find initial position of rotor. In this thesis the initial rotor position is estimated by the current peak differences. By this method, we can start motor in clock wise direction. This paper uses sliding mode control to implement position sensorless control for ceiling fan motor. All the control are implemented and verified. The provided results are also explained.
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Liu, Jia-Song, and 劉家嵩. "Sensorless position control of proportional solenoids." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/13874231703090883275.
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碩士<br>國立雲林科技大學<br>機械工程技術研究所<br>87<br>This Purpose of this paper is to control the proportional solenoid using merely the estimated position feedback. The stroke-type proportional valve uses a position sensor (LVDT) on one side of the armature to measure its actual position and to control the spool position. Consequently, the flow-rate through the valve can be exactly controlled. The position sensor, however, is a relatively expansive component . Therefore, we attempt to propose a calculating algorithm to estimate the position instead of measuring it by the LVDT. In this paper, we found that the inductance of the proportional solenoid decreases while the stroke increases. Thus, the position , inductance and current will all be measured and a table of them is built.
Position is estimated from a two dimensional look up table of the incremental inductance and current. This method is successfully implemented in a proportional solenoid. The factors, which affect the accuracy of the estimation, as well as the methods of overcoming them are also described in this paper.
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LIU, CHUNG-HSIAO, and 劉忠孝. "Position control for a sensorless brushless dc motor." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/66553332260381674975.
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Chen, Yen-Ju, and 陳燕儒. "Position Sensorless Control of Permanent Magnet Synchronous Generator." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/94409210503408483400.
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碩士<br>國立交通大學<br>電控工程研究所<br>103<br>In this thesis, the position sensorless control of permanent magnet synchronous generator (PMSG) is studied. The curve of torque current V.S. rotor speed is given to achieve the characteristic curve of wind turbine. In the PMSG system, we obtain the initial rotor angle by Rotor Position Detecting Circuit (RPDC) and then use Sliding Mode Observer (SMO) to implement position sensorless control. For maintaining the output power of wind turbine within the maximum power point and balancing the power of wind turbine and load, the proposed MPPT algorithm is used. All the controllers and algorithms are implemented in Digital Signal Processor (DSP), and the simulation and experimental results are provided to verify.
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Shafeeq, K. Mohamed. "Position Sensorless Speed Control of Brushless DC Motor." Thesis, 2018. http://ethesis.nitrkl.ac.in/9889/1/2018_MT_216EE5316_MShafeeq_K_Position_.pdf.
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This project work presents the position sensor less speed control of brushless DC motor, brushless DC motors has the similar speed and torque characteristics of conventional DC motors, instead of commutating brushes brushless DC motor uses an electronic commutation system. To obtain the commutation instants the position of permanent magnet rotor position should detect, normally we use a position sensor to detect the position. instead of using the position sensor to detect the rotor position here in this project we are using the zero crossing instances of the back EMF to get commutation instances, when we use the phase back EMF wave forms for detecting the commutation instances there will be a 30-degree electrical phase shift between the commutation instances and the zero crossing points. To avoid this 30-degree phase shift between the commutation instances and zero crossing points instead of using the phase back EMF wave forms we uses the line to line back EMF wave forms.
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Lin, Ting-Wei, and 林庭緯. "Design and Implementation of a Sensorless IPMSM Position Control System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/v74t9k.
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碩士<br>國立臺灣科技大學<br>電機工程系<br>104<br>The thesis investigates a sensorless interior permanent magnet synchronous motor position control system. First, a high frequency voltage is injected into the d-axis. Next, the d-axis and q-axis high frequency currents are measured to estimate the rotor position of the sensorless motor. Two 12-bit analog to digital converters are used to implement the position control system. Moreover, a new compensation method is proposed to improve the rotor estimation error due to the influence of the mutual inductance. By measuring the coupling coefficients, a new compensation method is used to reduce the influence of the mutual inductance.The low resolution A/D converters with a digital signal processor,TMS320F2808, are employed to execute the position control,velocity control, current control, and rotor position estimation.Experimental results validate the correctness and feasibility of the proposed sensorless position control system.
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Chao, Yu-Ting, and 趙育廷. "Charging and Position Sensorless Control of the Flywheel Energy Storage System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/z622ne.
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碩士<br>國立中正大學<br>電機工程研究所<br>102<br>In the flywheel energy storage, the electrical energy is converted into the kinetic energy by making the flywheel spin nonstop in the vacuum. This thesis develops the flywheel energy storage system. The hardware consists of a permanent magnetic synchronous motor, a three-phase three-wire inverter, a flyback and the peripheral circuits of the micro-controller. The online parameter identification, the sensorless control and the current control are introduced in this thesis. The motor parameters are measured by the LCR meter to verify the online parameter identification. High frequency injection is adopted to estimate the rotor speed and the rotor position by this thesis. It is suitable for the motor at black start and low speed. The SVPWM is proposed in this thesis for division-summation current control. All of the controls are accomplished via the micro-controller.
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Shen, Wen-Che, and 沈文哲. "Shaft Position Sensorless Control of a PMSM Self-Bearing Motor Drive." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/8c38e2.
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碩士<br>國立臺北科技大學<br>電機工程系所<br>102<br>Permanent Magnet AC-Self-Bearing Motor is a PMAC motor embedded active
magnetic bearing. The stator not only remains torque winding but also adds
suspension winding in order to suspend the rotor between air gap. Thus, it possesses
features such as zero friction, low noise, and high speed. Permanent magnet AC
motor usually requires the installation of a fixed encoder to detect shaft angle, but in
the case of rotor suspension, it can not use fixed encoder, so if we can use the
method of estimate shaft angle, the issues of measuring mechanism design can be
simplified.
The essay is based on Self-Bearing Motor, continues studying about radial force
and sensorless control before, then analysis the mathematical model of radial force
and verifies the Self-Bearing Motor’s radial position control by experiment. On the
other hand, this essay analyze shaft angle sensorless technology, combines high
frequency signal injection and back-EMF detect rotor angle position, to reach
estimate motor’s velocity and rotor angle position when the motor is in the still,
starts and rotates.
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Tseng, Hao-Ting, and 曾浩庭. "Development of Rotor Position Sensorless Control for Brushless DC Motor Drives." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/6e48ja.
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碩士<br>明志科技大學<br>電機工程系碩士班<br>103<br>This thesis presents the development of rotor position sensorless control for brushless DC motor drives. The back-EMF detection is firstly used to estimate rotor position, and the linear interpolation method is proposed to implement closed-loop field-oriented control to drive brushless DC motor without rotor position sensor. In this thesis, the mathematical models of brushless DC motor and inverter are analyzed. Then, the voltage space vector modulation is used to increase the voltage utilization from the inverter. A high-performance and low-cost digital signal processor (DSP, TMS320F28069) is used to control the system for reducing the circuit complexity. Experimental results indicate that the motor operates under 1500 RPM by the proposed rotor position estimator technique.
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Hsu, Chih-Hao, and 許智豪. "Position Sensorless Control for Single-Inverter-Fed Two Five-Phase PMSMs." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/62831598850011810326.
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碩士<br>國立交通大學<br>電控工程研究所<br>101<br>This thesis presents the implementation of the position sensorless speed control for two Five-phase Permanent-Magnet Synchronous Motor(PMSM) fed by single voltage-source-inverter(VSI). From the equivalent model of the Five-phase PMSM, the behaviors of two series connected Five-phase PMSMs are studied, and the position error equations with arctan function are derived. Then, the efficient CORDIC-based method is proposed to solve the arctan equation. In addition, the robust feedforward current control is also proposed to improve the current tracking performance. Finally, some results are provided to verify the implemented position sensorless control.
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Chen, Ming-Hui, and 陳明輝. "Shaft Position Sensorless Control of Permanent Magnet AC Motor and Verification." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/50735407268000826401.
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碩士<br>國立臺北科技大學<br>電力電子產業研發碩士專班<br>99<br>Permanent magnet AC motor was widely used because of the high efficiency, high-speed operation, and the high ratio for per unit current torque. In order to achieve the purpose of vector control, we need the rotor position by the position sensors like encoder, resolver and hall sensor in the motor control system. There position sensors can not to be installed in everywhere. In this thesis, the back EMF method of shaft position sensorless control of observer was explored to replace the position sensors and improve the system reliability. This thesis aims to explore the shaft position sensorless control of permanent magnet AC motor and verification. First, we analysised the based theoretical of the permanent magnet AC motor control, shaft position sensorless and velocity observer control of the mathematical model. We explored the shaft position sensorless control of observer application to control system. Finally, we proposed a control strategy application to the shaft position sensorless control system.
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Shih, Wei-Jhih, and 施威志. "A Study on Sensorless Speed and Position Control of Automotive Motors." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/8zdv5a.
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碩士<br>國立宜蘭大學<br>機械與機電工程學系碩士班<br>101<br>This study establishes the position memory function for automotive power seat motors without using any position sensors. Their positioning performances are compared with motors using hall effect sensors feedback control. The reasons for power seat positioning error with or without position sensors are exploited. Through the compensating mechanism built by this study, the automotive power seat achieves positioning accuracy that meets the test specifications. For the sensorless position control, this research proposes several different software algorithms and hardware feedback circuits to accomplish positioning control, and compares the advantages and disadvantages to different approaches of realization. This study also suggests a contactless H-Bridge driving circuit structure. From theoretical analysis and experimental results, this contactless H-Bridge driving circuit can effectively solve the positioning error while the motor starts or stops, and improve the positioning control. Finally, we apply the technique of sensorless control to automotive cooling fans, and experimental results, that prove the feasibility for the motor to obtain sensorless speed control function.
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Wu, Jun-Yi, and 吳俊毅. "Position Sensorless Control and Active Power Decoupling Control for Switched Reluctance Motor Drive System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/298439.
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碩士<br>國立交通大學<br>電控工程研究所<br>107<br>This thesis realizes a four-phase switched-reluctance motor drive system to meet the requirements of electric vehicles (EVs) with vehicle-to-grid (V2G) and grid-to-vehicle (G2V) functions. It is an all-in-one system which integrates three-level flying capacitor DC-DC boost converter and asymmetric half-bridge converter, the motor drive mode and the grid-connected mode can be constructed without the need for additional components. In the motor drive mode, to select the appropriate asymmetric half-bridge converter switch state, the phase current of the 4-phase switched reluctance motor can be feedback and reconstructed to achieve independent control of each phase current in the case of only one current sensor. The purpose is to use another current sensor with a special narrow pulse voltage injection strategy to detect the correct switched reluctance motor commutation timing, saving the cost of hall sensor and encoder required for traditional switched reluctance motor drive system. In the grid-connected mode, the double-line-frequency power generated from power factor correction of the grid is calculated. With proper controller design and feedforward signal calculation, the three-level flying capacitor DC-DC boost circuit can be utilized. The flying capacitor absorbs the double-line-frequency power to achieve active power decoupling and improve the performance of the system. The overall system design uses PSIM for simulation verification, and the digital control algorithm is implemented in Field Programmable Gate Array (FPGA) chip. Finally, the experiment and simulation results are analyzed and discussed.
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Ho, Zu-Sheng, and 何祖盛. "Research on the Position Sensorless Control Technology of the Brushless DC Motor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/bp38k6.
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博士<br>義守大學<br>電子工程學系<br>103<br>The brushless DC motor rotor position sensors are needed to provide rotor position information for commutation. If the rotor is not placed in the best position, it might cause a phase-lag or phase-lead during commutation. The brushless DC motor can adopt a sensorless drive method to detect the rotor position and replace the rotor position sensors. This can remove the placement problems of rotor position sensors and enable the motor to run better in environments of high temperatures or humidity and other harsh conditions. However, the most troublesome aspects of the sensorless drive are the starting process and the impact that the sensorless method to detect the rotor position has on the operation. This dissertation presents a full speed range sensorless circuit that uses the PWM of commutation signals to filter out noise caused by PWM switching in the phase voltages. This makes the motor easy to start, does not produce phase shifting problems at high speed, and even achieves the purposes of high and low voltage systems.
When the brushless DC motor is running, it will cause the problem of a current lag because of the characteristics of the inductor. To improve this problem, this dissertation proposes two correction methods: One is unexcited phase correction method. The method detects deviations from the current phase by using the two unexcited phase freewheeling current effects that exist within an electric cycle and then achieves phase correction through the phase control. The other way is the minimum torque ripple correction method, which uses the characteristics of the DC bus current driving produced in response to determine the phase deviation. Ultimately, the method uses the phase control to achieve the correction of minimum torque ripple to improve the problem of torque fluctuation when driving. In addition to providing the correct phase information for the sensorless drive, these two correction methods can also be applied to the sensor drive to improve the placement of the rotor position sensor offset problems.
This dissertation integrates the proposed back electromotive force (BEMF) circuit, positive phase drive, and the minimum torque ripple drive to establish a platform for rotor position sensor calibration. The rotor position sensor is usually fixed on the PCB or embedded into mechanical structure. However, during the processing or assembly by operators, position deviation can easily occur. Currently, the rotor position sensor calibration methods make the rotor rotate by the method of dragging and make corrections through the relationship between the back electromotive force and the rotor position sensor. The proposed rotor position sensor calibration platform uses the sensorless drive in the correct phase or minimum ripple phase, determines the deviated angle by the relationship between the commutation state and the rotor position sensor, and then displays the error angle on the LCD or computer. Finally, the experiments verified that the sensorless circuit, correct phase correction, minimum ripple correction, and rotor position sensor calibration platform proposed by this dissertation are correct, and stably achieved the practical purposes of the theory.
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Huang, Chien-Yu, and 黃健毓. "Extended-EMF Based Position Sensorless Control of the Permanent-Magnet Synchronous Motor." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/97gs4x.
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碩士<br>國立中正大學<br>電機工程研究所<br>106<br>The main purpose of this thesis is to develop the position sensorless control of permanent-magnet synchronous motor (PMSM) based on extended electromotive force (EMF). The rotor position and speed are estimated via extended EMF method. Moreover, Takagi-Sugeno (T-S) fuzzy control is adopted to implement the driving control of a PMSM. In the aspect of position sensorless control, the extended EMF algorithm is adopted and the extended EMF is estimated by using a least-order observer. In the aspect of driving control, the T-S fuzzy models are implemented to design the controller based on the concept of parallel distribution compensation (PDC). The stability analysis is verified through Lyapunov theorem. Finally, the controller gains are obtained by Linear Matrix Inequality (LMI). In this thesis, hardware configuration, auxiliary circuit and software scheme are introduced. The power switches of the PMSM driver are driven by space-vector pulse width modulation (SVPWM). All control schemes are digitally realized by the microcontroller. Eventually, the rotor position estimation and speed tracking performance are validated by experimental results.