To see the other types of publications on this topic, follow the link: Starter motor.
Dissertations / Theses on the topic 'Starter motor'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 49 dissertations / theses for your research on the topic 'Starter motor.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Gerhardsson, Daniel. "Starter Motor Protection." Thesis, Linköping University, Vehicular Systems, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57309.
Full textAbstract:
Starter motors are sensitive for overheating. By estimating the temperature and
preventing cranking in time, there is an option to avoid the dangerous temperatures.
The truck manufacturer Scania CV AB proposed a master thesis that
should evaluate the need of an overheating protection for the starter motor.
The aim is to evaluate any positive effects of implementing an algorithm that
can estimate the brush temperature instead of using the available time constrain,
which allows 35 seconds of cranking with a following 2 seconds delay, allowing the
crank shaft to stop before a new start attempt is allowed. To achieve high load
on the starter motor and high temperature in the brushes, tests were performed
under
Initial testing on truck, under normal temperatures, showed that the batteries
could not run the starter motor long enough to reach high temperatures in the
brushes. This is believed to be caused by the voltage drop between the batteries
and the starter motor, causing the starter motor to run in an operating area it
is not optimized for. There are several other problems which gives a higher load
on the engine, for example oil viscosity, resulting in higher currents, but those are
not mentioned in this report.
Three different models are compared, Two State Model, Single State Model
and a Time Constrained Model. Tests and verifications show that the Two State
Model is superior when it comes to protecting the starter motor from overheating
and at the same time maximizing the cranking time. The major difference between
the Two State Model and the Single State Model are the cooling characteristics.
In the Single State Model the brush temperature drops quickly to the outside
temperature while in the Two State Model the brush temperature drops to a
second state temperature instead of the outside temperature. With the currently
implemented time constrain it is possible to overheat the starter motor. The
algorithms are optimized under cold conditions, due to problems in reaching high
temperatures under warmer conditions.
−20 Celsius.
2
Ochoco, G. Johann R. (G Johann Romulado). "Extending starter motor life via optimization of commutation system parmeters." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35414.
Full textAbstract:
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1994.Includes bibliographical references (p. 60).
by G. Johann R. Ochoco.
M.S.
3
Yeoh, Seang Shen. "Control strategies for the More Electric Aircraft starter-generator electrical power system." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/34098/.
Full textAbstract:
The trend towards development of More Electric Aircraft (MEA) has been driven by increased fuel fossil prices and stricter environmental policies. This is supported by breakthroughs in power electronic systems and electrical machines. The application of MEA is expected to reduce the aircraft mass and drag, thereby increasing fuel efficiency and reduced environmental impact. The starter-generator (S/G) scheme is one of the solutions from the MEA concept that brings the most significant improvement to the electrical power generation system. A S/G system is proposed from the possible solutions brought by the MEA concept in the area of electrical power generation and distribution. Due to the wide operating speed range, limited controller stability may be present. This thesis contributes to the control plant analysis and controller design of this MEA S/G system. The general control requirements are outlined based on the S/G system operation and the control structure is presented. The control plants are derived specifically to design the controllers for the S/G control scheme. Detailed small signal analysis is performed on the derived plant while taking into consideration the aircraft operating speed and load range. A safe range for the controller gains can then be determined to ensure stable operation throughout the S/G operation. Adaptive gain and a novel current limit modifier are proposed which improves the controller stability during S/G operation. Model predictive control is considered as an alternative control strategy for potential control performance improvements with the S/G system. The technical results and simulations are supported by Matlab®/Simulink® based models and validated by experimental work on a small scaled drive system.
4
White, Philip J. "Computer-aided investigation into the cold start performance of spark ignition engines." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339563.
Full text
5
Zhang, Pinjia. "Active thermal protection for induction motors fed by motor control devices." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34811.
Full textAbstract:
Induction motors are widely used in industrial processes. The malfunction of a motor may not only lead to high repair costs, but also cause immense financial losses due to unexpected process downtime. Since thermal overload is one of the major root causes of stator winding insulation failure, an accurate and reliable monitoring of the stator winding temperature is crucial to increase the mean time to catastrophic motor breakdown, and to reduce the extraordinary financial losses due to unexpected process downtime.
To provide a reliable thermal protection for induction motors fed by motor control devices, a dc signal-injection method is proposed for in-service induction motors fed by soft-starter and variable-frequency drives. The stator winding temperature can be monitored based on the estimated stator winding resistance using the dc model of induction motors. In addition, a cooling capability monitoring technique is proposed to monitor the cooling capability of induction motors and to warn the user for proactive inspection and maintenance in the case of cooling capability deterioration. The proposed cooling capability monitoring technique, combined with the proposed stator winding temperature monitoring technique, can provide a complete thermal protection for in-service induction motors fed by motor control devices.
Aside from online thermal protection during a motor's normal operation, the thermal protection of de-energized motors is also essential to prolong a motor's lifetime. Moisture condensation is one of the major causes to motor degradation especially in high-humidity environments. To prevent moisture condensation, a non-intrusive motor heating technique is proposed by injecting currents into the motor stator winding using soft-starters. A motor's temperature can be kept above the ambient temperature due to the heat dissipation, so that the moisture condensation can be avoided.
To sum up, active stator winding temperature estimation techniques for induction motors under both operating and de-energization conditions are proposed in this dissertation for both thermal protection and optimizing the operation of a motor system. The importance of these proposed techniques lies in their non-intrusive nature: only the existing hardware in a motor control device is required for implementation; a motor's normal operation is not interrupted.
6
Dias, Rogério Pinho. "Controle de torque do motor de indução trifásico para aplicação em chaves eletrônicas de partida suave." Universidade do Estado de Santa Catarina, 2008. http://tede.udesc.br/handle/handle/1859.
Full textAbstract:
Made available in DSpace on 2016-12-12T17:38:31Z (GMT). No. of bitstreams: 1
Resumo - Rogerio Pinho Dias.pdf: 124846 bytes, checksum: 695e36f2af2139d1d4a624a0e573473f (MD5)
Previous issue date: 2008-02-15Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
This work presents a study for implementation of the control of limitation of electromagnetic torque develops for three-phase induction motor in soft-starters applications. The proposed method is based on the electromagnetic torque estimation from the measurement of stator currents and the stator voltages. The related problems to the stator flux estimation by pure integration of the equation of the stator voltages are minimized with use of low pass filters in the place of pure integrators and high pass filter at the analogical input to eliminate the measurement offset error. The amplitude and phase errors resultant of the filtering process are reduced with the use of a factor of correction in the final stage of integration. Gotten experimental results validate the proposed method showing its viability in applications where the objective is to control only the start or stop process of three-phase induction motors and possibility the applications with soft-starter - to any type of load that does not need speed variation in permanent regimen.
Este trabalho apresenta um estudo para implementação de um controle de limitação do torque eletromagnético produzido pelo motor de indução trifásico para aplicação em chaves eletrônicas de partida suave. O método proposto é baseado na estimação do torque eletromagnético através da medição das correntes e tensões estatóricas. Os problemas relacionados à estimação do fluxo estatórico através da integração da força contra eletromotriz são minimizados com a utilização de filtros passa baixa no lugar dos integradores puros e de filtros passa alta nas leituras analógicas das tensões e correntes estatóricas. Os erros de amplitude e fase devidos aos processos de filtragem são reduzidos com a utilização de um fator de correção na etapa final de integração. Resultados experimentais validam o método proposto mostrando a viabilidade de sua aplicação no controle dos processos de partida e parada do motor de indução trifásico, possibilitando assim, a aplicação das chaves eletrônicas de partida suave - a qualquer tipo de carga - que não necessite da variação de velocidade em regime permanente
7
Mellblom, Fredrik. "Start modelling for heavy trucks." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2618.
Full textAbstract:
Modern heavy trucks tend to get more and more equipment demanding electric power. As a result, the electric power left for startingbecome more and more limited. If a complete view of the entire starting system-battery, starter and the combustion engine - is used, the total system can be investigated and optimized. This thesis is a study of the starting system and its components. Theories for each component are presented and models are derived for a complete starting system. Focus lies on the battery and starter motor. The purpose of the modelling work is to gain knowledge of the starting system. Some results can also be obtained from the simulations - it is very important to keep the electrical resistance as low as possible and the differences between battery types are surprisingly big.
8
Hasan, S. M. Nayeem. "Hybrid Electric Vehicle Powertrain: On-line Parameter Estimation of an Induction Motor Drive and Torque Control of a A PM BLDC Starter-generator." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1208185834.
Full text
9
Brtnický, Jiří. "Dálkové ovládání motorového spouštěče." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220077.
Full textAbstract:
The master´s thesis describes the design of the remote control, which is used as accessories for motor circuit-breaker. The work is based on the concept of control realized in the bachelor´s thesis. Master’s thesis contains a literature review of management method stepper motors with integrated circuits. standards relating to the control and switching low voltage devices were rehearsed. It was compiled schema of an entire unit after designing optimal control section of a stepper motor with integrated circuits, which consists of four parts (power supply, power section for driving an coils of stepper motor, control section and section for driving external devices). Design and realization of PCB are based on compiled schema, PCB was mounted with components and final PCB was recovered. The last part of thesis is about verification a functionality with using measurement of a prototype parameters.
10
Sláma, Miloslav. "Mechanismus vysouvání pastorku automobilového startéru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221191.
Full textAbstract:
The thesis describes ways ejection pinions automotive starter and evaluation of the advantages and disadvantages of each solution. The first chapter deals with the principle of operation of DC motors and starters parameters. In the second part, the individual systems are theoretically discussed in terms of design and their advantages and disadvantages. The third part is focused on the most common system, which is analyzed in terms of mechanical and electrical reliability. The last point of the work is to design an experimental analysis Reach starter pinion.
11
Benetka, Martin. "Analýza, návrh a optimalizace automobilového startéru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220715.
Full textAbstract:
This thesis aims at automotive starters, their construction, characteristics and problems with starting at low temperatures. There are kinds of starters, function principle, construction, advantages and disadvantages in the first part of thesis. Issues with combustion engine starting and basic technical requirements are also mentioned here; characteristics and importance of starters and combustion engines are also described. Last chapters of this part are dedicated to finite element method and its implication. There are analytical calculations of starter in the second part of thesis. Results are compared with experimental obtained (measured) values and results from RMxprt. Finite element method results are compared, too. Magnetic induction improvement in stator is also suggested.
12
Nejedlý, Vladislav. "Analýza a inovace elektrických motorků pro automobily." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218796.
Full textAbstract:
In this thesis analysis and inovation of electric machines for cars is discused. There are described principles of basics DC and AC electric machines. In detail this thesis deals with small electric machines used in cars. At least, electro motor for wiper is investigated and possibilities of its inovation in different ways are also mantioned.
13
Carlsen, Anthony Nigel. "Motor preparation and the auditory startle response." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/384.
Full textAbstract:
Studies investigating human information processing have provided evidence that in some cases, movements can be prepared in advance. Although evidence for motor preparation has been shown at cortical and spinal levels, motor preparation at a subcortical level is not well described. One line of inquiry has involved the use of a startling acoustic stimulus (115-124 dB) that can act as an early trigger for pre-programmed actions in reaction time (RT) tasks. In light of this new research paradigm, the startle reflex may be used as a tool to investigate motor preparation. Here, six experiments were conducted that work towards the goals of understanding the mechanism of RT shortening due to startle, and motor preparation at a subcortical level.
The first section (2 experiments) of this dissertation provides evidence that when a motor action can be prepared in advance, it is pre-programmed and stored subcortically awaiting the normal cortical “go” signal. A startle appears to activate structures directly that are involved with the voluntary response channel leading to early triggering of the pre-programmed response, and dramatically reduced RT. In the current dissertation we investigated alternative mechanisms to explain startle RT facilitation, including the stimulus intensity effect, and a fast transcortical route, with results supporting the original subcortical storage hypothesis.
The second section (4 experiments) presents data which together provide insight into motor programming processes, and the circumstances under which a response is pre-programmed. For example, when the possibility of not having to make the response existed, a known response was not pre-programmed. Similarly, no pre-programming occurred when certainty existed regarding when to respond. However, while a previous experiment showed that having to make a choice between several response alternatives precluded pre-programming, this dissertation shows that if possible response alternatives are not in conflict with one another, multiple responses can be prepared in parallel. Finally, the complexity of a response such as one involving multiple sequenced sub-components may limit the ability to pre-program in a simple RT task. Taken together, these results suggest that pre-programming is dependent on the task characteristics and appears to involve implementation of strategies to increase programming efficiency.
14
Zhang, Jun Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "Direct torque controlled induction machines for integrated starter/alternator system." Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2007. http://handle.unsw.edu.au/1959.4/26224.
Full textAbstract:
An integrated starter/alternator (ISA) has been proposed for the future 42 V PowerNet, which combines both starter and alternator functions into a single electrical machine with bidirectional power flow ability. This thesis presents analysis, design, modeling and experimental results of the direct torque controlled ISA system based on a low voltage induction machine. The classical direct torque controlled ISA based on switching-table is systematically for an ISA evaluated in this thesis. The simulation and experimental results show that the direct torque control (DTC) concept can be successfully extended to the ISA application. An improved DTC of the ISA based on direct stator flux vector is presented to reduce the drawbacks of high torque and flux ripples of the classical DTC. Robust design of the controller ensures the system is not sensitive to the variation of rotor resistance. By controlling the electromagnetic torque of the induction machine quickly, the required dc bus voltage can be well regulated within the 42 V PowerNet specifications. Another improved DTC of the ISA with direct torque and flux control is also studied. Compared to the direct flux vector control scheme, the calculation of the commanded voltage vector in this scheme only requires the derivative of the stator flux magnitude, which is a dc quantity. In addition, both torque and flux are regulated directly with two independent closed-loops. This scheme is relatively insensitive to the noise. The thesis proposed compensation methods to reduce the effects of switch voltage drops and dead-time on the estimation of the stator flux. Experimental results confirm that the estimation error is reduced with compensation for both motoring and generating modes of the ISA. A closed-loop type of sliding mode flux observer is proposed to reduce the estimation error of the stator flux. Both Simulation and experimental results confirm that the proposed sliding mode observer is insensitive to the stator resistance variation and sensor offsets. A loss minimized scheme with power factor control for the ISA is proposed in this thesis. It provides a simple solution for the efficiency improvement of the induction machine without requiring any speed or load information. The effectiveness of the direct torque controlled induction machine for an integrated starter/alternator system has thus been confirmed and well supported by the studies presented in this thesis.
15
Ormsson, Kristinn Arnar, and Henrik Persson. "A commercial vehicle’s electrical startability." Thesis, KTH, Hälsoinformatik och logistik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230226.
Full textAbstract:
In commercial vehicles, where the driver overnights with the engine turned off whilestill consuming electricity, it is important to know how much the battery can bedischarged before reliable engine starting is at risk. The vehicle’s ability to crank theengine, i.e. startability, changes with the vehicle’s ambient temperature and thebatteries state of charge. The aim of this project is therefore to test the startability ofa commercial vehicle and its cranking system’s behaviour at different ambienttemperatures and battery state of charge. Physical startability tests were planned andperformed on a commercial vehicle at different temperatures inside a climatechamber. The results of these tests show the torque of the vehicle’s powertrainincreasing with lowering temperature while the cranking system’s performancedecreases. This decrease in the cranking system’s performance is a result of thebattery’s lowering ability to supply power at lower temperatures.I tunga fordon, där chauffören spenderar natten med avstängd motor men fortsätteratt förbruka el, är det viktigt att veta hur mycket batterierna kan urladdas innanmotorn inte kan startas. Fordonets förmåga att starta motorn, det vill säga dessstartbarhet, ändras med omgivningstemperaturen och batteriernas laddnivå. Syftetmed projektet var därför att undersöka startbarheten på ett tungt fordon samt dessstartsystems beteende vid olika omgivningstemperaturer och laddningsnivåer påbatterierna. Under projektets gång planerades samt genomfördes provstarter meddet tunga fordonet vid olika omgivningstemperaturer i en klimatkammare.Provstarterna påvisade att släpmomentet på fordonets drivlina ökade med enfallande temperatur medan startsystemets prestanda försämrades. Startsystemetsförsämrade prestanda beror huvudsakligen på batteriernas försämrade förmåga attavge effekt vid lägre temperaturer.
16
Novák, Michal. "Ukázky řízení pohonu s měničem frekvence Sinamics S120." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254399.
Full textAbstract:
In this thesis is described a laboratory process of example of traction control with frequency converter SINAMICS S120. The focus of this thesis is divided into three parts. Modification of the traction to translational motion for transport of the open vessel with liquid. Proposal of the autonomous operation of the traction without connection to other devices such as a personal computer or PLC, including wiring diagram. The simulation of a dynamic movement for transport of the vessel with liquid in the simulation environment MATLAB and implementation using the proposed laboratory traction. Commissioning and activation of each control functions is described step by step.
17
Smith, Cora. "Investigating the Role of the Primary Motor Cortex in the StartReact Effect Using Transcranial Magnetic Stimulation." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36638.
Full textAbstract:
It is well-established that the presentation of a startling acoustic stimulus (SAS) simultaneous with the go-signal in a simple reaction time (RT) task results in significant RT reductions, while leaving movement kinematics essentially unaltered. While this phenomenon, termed the StartReact effect, has been extensively studied, cortical involvement in the neural mechanism underlying the RT-facilitation effects of a SAS remains widely debated. Applying sub-threshold TMS to motor areas results in increased cortical excitability and reductions in control RT. When this technique was used in a startle paradigm no RT benefits were seen, providing evidence that the cortex may not be involved in the StartReact effect; however, these results may also have been due to a floor effect of startle RT. It has been shown that RT in response to a SAS is significantly slower for complex movements, providing a possible method of distinguishing between these hypotheses. As such, the purpose of the experiments in this thesis was to determine if the application of sub-threshold TMS following a SAS when preparing to react with a complex movement would facilitate startle RT. If so, it would provide evidence for cortical involvement in the RT-facilitation effects of startle. The first experiment revealed that the task employed did not lead to an increase in RT in startle conditions, limiting the ability to make conclusions regarding the StartReact effect. In the second experiment the timing complexity of the task was increased, with the goal of increasing startle RT; however, startle RT was again not significantly slower for the complex movement than the simple movement. Furthermore, there was again no effect of TMS stimulation condition on startle RT. These results suggest that either the cortex does not play a role in the StartReact effect, or a floor effect of RT was reached in startle conditions; thus, alternative methods of investigating the neural mechanism underlying the RT-facilitation effects of startle are warranted.
18
Liu, Jingbo. "Modeling, analysis and design of integrated starter generator system based on field oriented controlled induction machines." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1132763176.
Full text
19
Shao, Jianwen. "Direct Back EMF Detection Method for Sensorless Brushless DC (BLDC) Motor Drives." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/35065.
Full textAbstract:
Brushlesss dc (BLDC) motors and their drives are penetrating the market of home appliances, HVAC industry, and automotive applications in recent years because of their high efficiency, silent operation, compact form, reliability, and low maintenance.
Traditionally, BLDC motors are commutated in six-step pattern with commutation controlled by position sensors. To reduce cost and complexity of the drive system, sensorless drive is preferred. The existing sensorless control scheme with the conventional back EMF sensing based on motor neutral voltage for BLDC has certain drawbacks, which limit its applications.
In this thesis, a novel back EMF sensing scheme, direct back EMF detection, for sensorless BLDC drives is presented. For this scheme, the motor neutral voltage is not needed to measure the back EMFs. The true back EMF of the floating motor winding can be detected during off time of PWM because the terminal voltage of the motor is directly proportional to the phase back EMF during this interval. Also, the back EMF voltage is referenced to ground without any common mode noise. Therefore, this back EMF sensing method is immune to switching noise and common mode voltage. As a result, there are no attenuation and filtering necessary for the back EMFs sensing. This unique back EMF sensing method has superior performance to existing methods which rely on neutral voltage information, providing much wider motor speed range at low cost.
Based on the fundamental concept of the direct Back EMF detection, improved circuitry for low speed /low voltage and high voltage applications are also proposed in the thesis, which will further expand the applications of the sensorless BLDC motor drives.
Starting the motor is critical and sometime difficult for a BLDC sensorless system. A practical start-up tuning procedure for the sensorless system with the help of a dc tachometer is described in the thesis. This procedure has the maximum acceleration performance during the start-up and can be used for all different type applications.
An advanced mixed-signal microcontroller is developed so that the EMF sensing scheme is embedded in this low cost 8-bit microcontroller. This device is truly SOC (system-on-chip) product, with high-throughput Micro core, precision-analog circuit, in-system programmable memory and motor control peripherals integrated on a single die. A microcontroller-based sensorless BLDC drive system has been developed as well, which is suitable for various applications, including hard disk drive, fans, pumps, blowers, and home appliances, etc.Master of Science
20
Kaczmarczyk, Ruben. "Synchronní stroj spouštěný ze sítě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377050.
Full textAbstract:
This work deals with explanation of the construction of a line start synchronous machine. Furthermore, the calculation of the asynchronous machine is made on the basis of the production documentation. The analytical calculation is done in the RMxprt program, then the calculations of both methods are compared. In addition, rotor adjustment of the specified asynchronous motor is performed, including the insertion of permanent magnets into the rotor. Ansys Maxwell program then optimizes and analyzes the engine, and also checks engine's start-up. Finally, the results are compared and summarized.
21
Drummond, Neil M. "Timing of Motor Preparation for Indirectly Cued vs. Directly Cued Movements During a Visuomotor Mental Rotation Task." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23302.
Full textAbstract:
Previous investigations comparing direct versus indirectly cued movements have consistently shown that indirectly cued movements take longer to prepare (Neely and Heath, 2010) and involve the recruitment of additional brain areas (Connolly et al., 2000). This increase in processing time has been associated with the additional cognitive transformations required of the task (Neely and Heath, 2010). In the present study we investigated whether differences between direct versus indirectly cued movements are also reflected in the time course of motor preparation. Participants performed a targeting task, moving directly to the location of a visual cue (i.e., directly cued movement) or to a location that differed by 60˚, 90˚, or 120˚ with respect to the visual cue provided (i.e., indirectly cued movements). Participants were instructed to initiate their movements concurrently with an anticipated go-signal. To examine the time course of motor preparation, a startling acoustic stimulus (SAS, 124dB) was randomly presented 150 ms, 500 ms, or 1000 ms prior to the go-signal. Results from the startle trials revealed that the time course of motor preparation was similar regardless of the angle of rotation required and hence whether it was a direct or indirectly cued trial. Specifically, motor preparation was delayed until less than 500 ms prior to movement initiation for both direct and indirectly cued movements. These findings indicate that similar motor preparation strategies are engaged for both types of cued movements, suggesting that the time to prepare a motor response may be similar regardless of whether a cognitive transformation is required.
22
Krejčí, Ondřej. "Řídicí jednotka pro BLDC motor." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220890.
Full textAbstract:
This master„s thesis elaborates with EC motors problematic. There are described essential features of brushless DC motors, their principles, construction and methods for rotor position detection. There are mentioned commonly used control algorithms of EC motors including theory of three-phase convertors. This thesis also contains a complex design of the universal convertor for EC motor and its practical implementation. Power parts losses calculation, heat-sink calculation and measurements at the convertor prototype are also described in this thesis.
23
Brian, Ali Sara. "Coaching Teachers to SKIP: A feasibility trial to examine the influence of the T-SKIP package on the object control skills of Head Start preschoolers." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405815226.
Full text
24
Kumar, Jha Amit. "Optimization of Line Start Permanent Magnet Synchronous Motor for Magnet Cost Reduction." Thesis, KTH, Elektrisk energiomvandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-124550.
Full textAbstract:
In this thesis different methods of optimizing line start permanent magnet motor (LSPM) for magnet cost reduction is studied. Influence of different parameters has been studied by simulating magneto-static and transient FEM models of the machine. Finally a motor design of a LSPM with high rotor saliency has been proposed. The first method investigated is the use of flux barriers in LSPM and its effect on the magnetic flux leakage. The flux barriers reduce the flux leakage and hence help in reducing magnet volume. The second method studied is the use of two different grades of magnets. Using low price magnets help in reducing the total magnet cost without reducing the air gap flux density. The reduction in NdFeB magnet volume is not substantial by using both the methods mentioned above. The third method investigated is increasing the saliency of the rotor by introducing flux barriers and reducing the corresponding magnet volume. Both the magneto static and transient models are used to study the effect of different parameters of the motor. The placement and volume of magnet plays a critical role in motor performance. At first, the developed reluctance torque of the motor is maximized by doing parametric study and then magnets are placed in slots to achieve the required efficiency and power factor. The motor is simulated with NdFeB magnets and with Ferrite magnets. It has been found that using high saliency LSPM motor the NdFeB magnet volume can be reduced significantly. It is also shown that the same performance of motor (as compared to the motor with NdFeB magnets) can be achieved by using Ferrite magnets. The volume of Ferrite magnet required will be larger but still cost-wise using Ferrite is an attractive choice. Therefore, a design of motor is proposed using both NdFeB magnets and Ferrite magnets. Finally, the performance of proposed LSPM motor with high saliency is compared with that of an induction motor.
25
Modeer, Tomas. "Modeling and testing of line start permanent magnet motors." Licentiate thesis, Stockholm : Elektrotekniska system, Electrical Engineering, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4488.
Full text
26
Lee, Joon Young. "A Mixed-Method Sequential Explanatory Study of Fundamental Motor Skills Competence of Underserved Preschool Children." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1752400/.
Full textAbstract:
This dissertation investigated the roles of early childhood fundamental motor skills (FMS) competence on physical, cognitive, and psychosocial health outcomes among underserved preschoolers in Head Start, and examined parental influence on their children's FMS competence. An explanatory sequential mixed methodology was used to examine the predictive strength of FMS competence on physical, cognitive, and psychosocial health outcomes among 216 underserved preschoolers from six Head Start centers (Mage = 4.32, SD = 0.63; girls 56.5%). This methodology allowed for a follow-up qualitative aspect to explore the influence of parents' perceptions and behaviors on their child's FMS competence and health outcomes in a subsample of eight parent–child dyads who demonstrate high or low FMS competence in the quantitative data. The results of this dissertation suggest that preschoolers' FMS competence, especially locomotor skills, were associated with and predicted various health outcomes in sedentary behavior (β = -0.21), light physical activity (β = 0.23), executive function (β = -0.21), and perceived motor competence (β = 0.34). No significant influences of FMS competence on moderate-to-vigorous, body fatness, HRQoL were found (p > 0.05). We also found that positive parental influences (role modeling, support, and facilitation) were observed more often among preschoolers in the high FMS competence group. In addition, preschoolers with single, divorced, or young parents (age range 18–24) tended to show low FMS competence. The analysis of children's drawing pictures also indicated differences in images related to the moments when they played games or sports with parents based on their FMS competence levels. Practical implications and future research direction are discussed.
27
Biancone, Patricia L. "The Effects of an Integrated Early Literacy and Motor Skill Intervention on Children’s Alphabet Knowledge, Initial Sound Awareness, and Fundamental Motor Skill Outcomes: An Early Efficacy Study." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1530277897706931.
Full text
28
Abboud, Mohamad Moulham. "Simulation of 3ph induction motor in Matlab with VVVF starting method." Thesis, Högskolan i Halmstad, Energivetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-31102.
Full textAbstract:
Nowadays, three-phase induction motors are widely used on industrial and other types of processes. Therefore, accurate knowledge of an induction motor performance is very essential to have an idea of its operation conditions. This study is a sequel of a previous one, where Direct and Soft starting methods of three-phase motors has been simulated and compared. As in the previous study, the theory behind this one is based on representing the real motor by aset of equations and values in Matlab, forming a corresponding idealistic motor in a way where all the physical effects are similar. The motor is started under three different frequencies in the VVVF method using supporting simulation of the current, torque, speed,efficiency and power factor curves. The results of the three starting methods are then discussed and compared.Numera är tre-fas asynkronmotorer i stor utsträckning på industriella och andra typer av processer. Därför är det mycket viktigt att ha exakt kunskap om en induktionsmotorprestanda för att ha en uppfattning om dess driftsförhållanden . Denna studie är en fortsättning av en tidigare, där direkt och mjukstart metoder för trefasmotorer har simulerats och jämförts. Såsom i den tidigare studien, är teorin bakom denna en baserat på representerar den verkligamotorn av en uppsättning ekvationer och värden i Matlab, som bildar en motsvarande ideell motor på ett sätt där alla de fysiska effekterna är likartade . Motorn startas under tre olika frekvenser i VVVF metod med stöd simulering av ström, vridmoment, hastighet, effektivitetoch effektfaktorn kurvor. Därefter, resultaten av de tre startmetoder diskuteras och jämföras.
في الوقت الحالي تستخدم المحركات التحريضية ثلاثية الطور بشكل واسع في التطبيقات الصناعية و غيرها. و لهذا فإن المعرفة الدقيقة بأداء المحرك التحريضي أساسية لإعطاء فكرة عن ظروف تشغيله. إن هذه الدراسة هي تتمة لدراسة سابقة حيث تمت محاكاة و مقارنة طريقتي الإقلاع المباشر و الناعم للمحرك التحريضي ثلاثي الطور. كما في الدراسة السابقة, فإن هذه الدراسة مبنية على تمثيل المحرك الحقيقي بمجموعة من المعادلات و القيم الاسمية في برنامج ماتلاب لتكوين محرك مثالي مطابق, بحيث تكون جميع الآثار الفيزيائية مماثلة للمحرك الحقيقي. يتم إقلاع المحرك عند ثلاث ترددات مختلفة بطريقة تغيير التردد و التوتر و يتم محاكاة هذا الإقلاع عبر منحنيات التيار، العزم، السرعة، المردود و عامل الاستطاعة ثم تقارن نتائج طرق الإقلاع الثلاثة.
29
Vácha, Pavel. "Výpočet jednofázového asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219186.
Full textAbstract:
The master´s thesis deal with the thesis of a single-phase induction motor that is more and more used all over the world. Its aim is assembling the information about this type of motor and its calculation. The content of the first part is the theoretical analysis of a single-phase induction motor and acquirement ways of the stroke moment. Than the work contains a project of basic schema of the single-phase induction motor with an auxiliary phase. The practical part is devoted to an elaboration of demonstration example of the single-phase induction motor with concrete parameters calculation, its method was projected before. Than there is practising successived measuring on the motor of the same parameters made firm EMP s.r.o. Slavkov by Brno in this part. In the conclusion there is the evaluation of the whole process with reached results.
30
Lolová, Iveta. "Topologická optimalizace synchronních strojů spouštěných ze sítě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413057.
Full textAbstract:
Diplomová práce se zabývá topologickou optimalizací elektrických strojů a reluktančními synchronními stroji spouštěnými za sítě. Práce obsahuje literární rešerši na téma topologické optimalizace elektrických strojů a na téma synchronní reluktanční stroj spouštěný ze sítě. Jsou zde popsány možné způsoby charakterizace optimalizovaného prostoru. Především je rozebrán vliv rozmístění Gaussových funkcí na finální Gaussovu síť. V této práci je vytvořen vyhodnocovací algoritmus pro jednotlivé jedince, který zajišťuje komunikaci mezi Ansys Maxwell a optimalizačním softwarem SyMSpace. Navíc tento algoritmus vede ke zkrácení výpočetní doby počáteční selekcí nevyhovujících jedinců. Dále je provedena topologická optimalizace LSSynRM s využitím normalizované Gaussovy sítě a zhodnocení výsledků.
31
Tibola, Jonas Roberto. "Controle e supervisão de fonte ininterrupta de energia híbrida." Universidade Federal de Santa Maria, 2017. http://repositorio.ufsm.br/handle/1/12301.
Full textAbstract:
This work presents contributions to the modeling, control and management of an
hybrid uninterrupted power supply (UPS) based on Otto cycle power generator set and
lead acid battery bank. The proposed configuration is called hybrid due to the presence
of two energy storage elements: i) the fuel fed the Otto cycle internal combustion engine
(ICE) of the generator set and ii) a lead acid battery bank, which can be recharged from
the grid or from the generator. With the hybridization it is possible to add up the advantages
of UPS’s such as uninterrupted power supply and high output energy quality with
the advantages of power generator sets, such as high autonomy and lower installation cost
for high autonomy. In addition, with the hybrid topology it is possible to explore degrees
of freedom that do not exist in the independent configurations, such as: i) variable
speed operation and ii) start-stop operation of the MCI in order to reduce consumption/
emissions in lower loads, (iii) use of Otto cycle engine with lower cost in relation to
a Diesel ICE. The hybrid UPS is composed of an Otto cycle internal combustion engine
(ICE), a three-phase/three-wire rectifier, which can be connected via contactors to the
grid, or to the permanent magnet synchronous generator (PMSG), a battery bank connected
to the DC bus through a bi-directional boost converter, and a three-phase/four-wire
inverter at the output. Experimental results are provided indicating that variable speed
operation can achieve a reduction of up to 32% in specific fuel consumption, depending
on the load range. For start-stop operation, the reduction in specific fuel consumption
can reach up to 39%, depending on the load range.Este trabalho apresenta contribuições a modelagem, controle e gerenciamento de uma fonte ininterrupta de energia (UPS) híbrida baseada em grupo motor ciclo Otto e bateria chumbo ácido. A configuração proposta é denominada híbrida devido a presença de dois armazenadores de energia: i) o combustível para alimentar o motor a combustão interna (MCI) ciclo Otto do grupo motor gerador e ii) um banco de baterias chumbo ácido, a qual pode ser recarregado pela rede ou pelo gerador. Com a hibridização é possível agregar as vantagens das UPSs tais como, ininterruptibilidade de fornecimento de energia e alta qualidade de energia da tensão de saída, com as vantagens dos grupos motores geradores, tais como, elevada autonomia e menor custo de instalação para autonomias elevadas. Além disso, com a topologia híbrida é possível explorar graus de liberdade não existentes nas configurações independentes, tais como: i) utilização de velocidade variável e ii) operação em regime start-stop no MCI afim de reduzir consumo/emissões em baixas cargas, iii) utilização de motor ciclo Otto com menor custo em relação a um MCI Diesel. A UPS híbrida é composta por um motor a combustão interna (MCI), um retificador trifásico a três/quatro fios, o qual pode ser conectado através de contatoras à rede, ou ao gerador síncrono de ímãs permanente (PMSG), um banco de baterias conectado ao barramento através de um conversor boost bidirecional, e um inversor a quatro fios na saída. Resultados experimentais são apresentados indicando que a operação em velocidade variável pode alcançar um redução de até 32% no consumo específico de combustível, dependendo a faixa de carga. Já para a operação em regime start-stop a redução no consumo específico de combustível pode alcançar até 39%, dependendo da faixa de carga.
32
Gayubas, Mauricio. "A influência do canal de distribuição no processo decisório de compra de produtos remanufaturados em ambientes B2B: uma análise pelo conceito do triple bottom line (3BL)." Universidade Nove de Julho, 2016. http://bibliotecadigital.uninove.br/handle/tede/1465.
Full textAbstract:
Submitted by Nadir Basilio (nadirsb@uninove.br) on 2016-06-21T15:07:12Z
No. of bitstreams: 1
Mauricio Gayubas.pdf: 4547233 bytes, checksum: 9a10b3048bfb27a539b8a17481b2b509 (MD5)Made available in DSpace on 2016-06-21T15:07:12Z (GMT). No. of bitstreams: 1 Mauricio Gayubas.pdf: 4547233 bytes, checksum: 9a10b3048bfb27a539b8a17481b2b509 (MD5) Previous issue date: 2016-03-04
Remanufacturing auto parts is an important activity from the point of view of the triple bottom line (economic, social and environmental) because its components can be reuse and not only has to be sending to be recycled. This case study sought to identify the members of the distribution channel (remanufacturer, distributor and fleet owners) how they influence the willingness to pay in a B2B relation. In addition, regarding all members influences the other members of this distribution channel in making production, distribution and application decisions of alternators and starter motors remanufactured applied in urban and intercity buses. Studyinglocal governmental regulations in Brazil, it was not identified obligation regarding producers to collect alternators and starter motors at the end of their life cycle. This situation would help the manufacturer to develop a more efficient reverse logistics strategy, with higher product volume of remanufactured production and increased activity in volume within the factory and thus invest the market in a vision at the triple bottom line point of view, as well as a better vision of the product by environmentally sustainable point. The remanufacturer produce their products identifying this activity as a business opportunity in the same way that the product is distributed wholesale with the same vision for the distributor and applied in bus fleets as a more expensive product that the reconditioned or repaired in maintenance shops. However, this price is offseted by the benefit cost of quality of the remanufactured products. Despite efforts by the trade associations and remanufacturers, albeit timidly, the information from the point of view that remanufacturing is an environmentally and socially sustainable activity. Customers in the B2B relationship does not identify the remanufacturing activity in this way, leaving an opportunity for the remanufacturer to manifest and develop information tools for green marketing information regarding the pillars of sustainability, bringing the remanufacturer a competitive advantage in environmental awareness among the members of the distribution channel, as well as greater awareness in society. It is an opportunity to promote environmentally sustainable pillar vision for the fleet owners and society as a curriculum in the development of environmental awareness for future generations.
A remanufatura de autopeças é uma atividade importante do ponto de vista das dimensões da sustentabilidade (econômico, social e ambiental) por reutilizar os componentes de um produto com defeito e não somente enviar esse mesmo produto para reciclagem, assim, este estudo de caso buscou identificar nos membros do canal de distribuição (fabricante remanufaturador, distribuidor de autopeças e frotista) a relação B2B que um membro influencia o outro membro desse canal de distribuição na tomada de decisão de produção, distribuição e aplicação dos alternadores e motores de partida veiculares remanufaturados aplicados em ônibus urbanos e rodoviários. Mesmo com as diretrizes mundiais e as leis locais, no Brasil não foi identificada a obrigatoriedade do recolhimento dos alternadores e motores de partida no final do ciclo de vida, o que contribuiria para o fabricante poder desenvolver uma estratégia de logística reversa mais eficiente, com maiores volumes de produtos e maior atividade em volumes dentro da fábrica e assim, investir perante o mercado uma visão do produto pelo ponto de vista ambientalmente sustentável. O fabricante remanufatura os seus produtos identificando essa atividade como uma oportunidade de negócio, da mesma forma que o produto é distribuído no atacado com essa mesma visão pelo distribuidor e aplicado nas frotas de ônibus como um produto mais caro que o recondicionado ou consertado nas oficinas de manutenção dentro das suas próprias garagens. Porém, esse preço é compensado pelo custo benefício da qualidade em que é produzido. Mesmo com esforços por parte das entidades de classe e dos fabricantes, para informar do ponto de vista de que a remanufatura é uma atividade ambientalmente e socialmente sustentáveis, os clientes dessa relação B2B não identificam a atividade de remanufatura dessa maneira, deixando uma excelente oportunidade para o fabricante se manifestar e desenvolver ferramentas de divulgação pelo marketing verde sobre a informação das dimensões da sustentabilidade, trazendo para o remanufaturador uma vantagem competitiva sobre a consciência ambiental junto aos membros da cadeia de distribuição, como também maior conscientização junto à sociedade. É a oportunidade de fomentar a visão da dimensão ambientalmente sustentável para os frotistas e para a sociedade como currículo no desenvolvimento da conscientização ambiental.
33
Felicetti, Roberto. "Field Current Control for the Damping of Rotor Oscillations and for the Alternative Start of Synchronous Machines : Further Innovative Applications of Field Current Active Control besides UMP-Compensation." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353669.
Full textAbstract:
The possibility to save energy in synchronous machines operation by dismissing d-axis damping bars and surrogating them with active excitation current control in sectored field winding is proved. In particular a way to recover the energy of rotor oscillations during power regulation is shown by means of a studycase generator whereas a self-starting machine is analytically and numerically designed in view of its next construction and test. Principal design requirements and limits for both applications are presented and discussed.
34
Niebuhr, Carin. "A Comparison of Evaluation Models for Handicap Intervention in a Head Start Program." DigitalCommons@USU, 1985. https://digitalcommons.usu.edu/etd/5951.
Full textAbstract:
The Model A and Model C Title I evaluation options were compared by using both options to measure the effectiveness of handicap intervention in a Head Start program. Two hundred three children in Jackson County (Oregon) were pretested with the Developmental Indicators of Learning Test (DIAL), the Peabody Picture Vocabulary Test (PPVT), the Visual-Motor Integration Scale (VMI), and the Carrow Elicited Language Inventory (CELI). The 43 children who scored below the predetermined cut-off level were placed in a six-month intervention program. One hundred forty-nine children remaining in the Head Start program in May were posttested with the same tests. Model A analysis of mean scores of the intervention group indicated significant score change on all three testing instruments. Model C analysis indicated no positive score change. It was posited that the Model A effect in this project was large because it combined a positive intervention effect with a positive general program effect. The Model C option showed no effect because the estimated nonintervention scores were very large due to the large positive score change in the nonintervention group.
35
Elistratova, Vera. "Conception optimale d’une gamme de moteurs synchrones à démarrage direct à haute performance énergétique." Thesis, Ecole centrale de Lille, 2015. http://www.theses.fr/2015ECLI0022/document.
Full textAbstract:
Ce travail a pour objectif de développer un outil analytique multi-physiques de dimensionnement d’une gamme de moteurs « hybrides » à démarrage direct, intégrant les avantages des deux technologies : l’auto-démarrage de la technologie asynchrone et les bonnes performances énergétique en régime permanent de la technologie synchrone à aimants permanents en répondant aux nouveaux enjeux d’efficacité énergétique et en ajoutant à cela les aspects économiques.La validation de cet outil est effectuée par des modèles éléments finis créés avec un logiciel commercial ANSYS/Maxwell et par des essais expérimentaux réalisés à l’aide de deux prototypes LSPMSM 7.5kWThis work aims to develop a multi-physical generic model (and a pre-design software) for a range of LSPMSMs which would integrate the advantages of both technologies: self-start asynchronous technology and good energy performance of synchronous permanent magnet technology. The validation of this model is carried out by finite element commercial software ANSYS / Maxwell and by experimental tests using two 7.5kW.LSPMSM prototypes
36
Nguyen, Cao Bao, and 高寶元. "Vibration and Acoustic Analysis of Starter Motor of Motorcycle." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/96943582054439228717.
Full textAbstract:
碩士明新科技大學
精密機電產業研發碩士外國學生專班
99
Shihlin Electric & Engineering Corporation is a big company with many electric products. One of the company’s products is the starter motor of the motorcycle. Because the acoustic-vibration problem of the starter motor is very important, this research is made to study the measurement methods and to learn the corresponding software for analyzing the acoustic - vibration problems. There are three experiments have been executed in this research: to use encoder for measuring the instantaneous speed of the motor; to use laser Doppler vibrometer for measuring the vibration of the motor; to use a microphone for measuring the noise of the motor. Pascal, LabView and Pulse software, respectively, have been used to analyze the result. With these results, the coustic–vibration problem of the motor are understood more clearly.
37
Chen, chi an, and 陳祈安. "On the Solenoid Switch Performance Improvement of the Starter Motor of an Automotive." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/93048034719031392933.
Full textAbstract:
碩士正修科技大學
機電工程研究所
96
The starter motor is a key component in the ignition process of an automotive. If the start motor fails, the automotive will lose its ability to power on. The start switch of the start motor is referred to as the electromagnetic switch. Many of the problems of the start motor can attribute to the malfunction of the electromagnetic switch. For example, insufficient pull force controlled by the electromagnetic switch will stop the start process of the start motor. To investigate the performance of the electromagnetic switch, The Taguchi method is utilized in this study. The characteristics of the electromagnetic switch are listed and classified into different factors with different levels. Some of the factors are controllable, and the others are uncontrollable. Using the Taguchi method, the factors are organized into an orthogonal array. Then, the combination of different levels of the factors is evaluated by experiment to investigate its influence on the electromagnetic switch. The experimental results are collected and analyzed for the improvement on the electromagnetic switch performance.
38
Yu, Hao, and 余豪. "Fault diagnosis of an automotive starter motor using a decision tree and neural network techniques." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/96496501892465953541.
Full textAbstract:
碩士國立彰化師範大學
車輛科技研究所
99
This study proposes an automotive starter motor fault diagnosis system using component analysis and fault conditions classification based on a decision tree and neural network. Traditionally, the fault diagnosis method depends on the technician's experience, but some faults might be judged inaccurately due to the experience of the technician making subjective decisions. The purpose of the start system in a vehicle is to rotate the crankshaft smoothly to start the engine. In the present study, a starter motor fault diagnosis system is proposed and developed for the classification of different fault conditions. The proposed system consists of feature extraction using principal component analysis (PCA) and Independent components analysis (ICA) to reduce the complexity of the feature vectors, together with classification using the decision tree and neural network techniques. In the output signal classification, three of the classification and regression trees (CART), Decision tree C4.5 and radial basis function networks (RBFN) are used to classify and compare the synthetic fault types in an experimental automotive starter motor platform. The experimental results indicate that the proposed fault diagnosis is effective and can be used for automotive starter motor of various fault operating conditions.
39
Yi-Yu, Hsieh, and 謝宜育. "The Decisive Factors of the Consumers Used Remanufactured Vehicle Products - A Study of Vehicle Starter Motor & Alternator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/mhfm26.
Full textAbstract:
碩士國立成功大學
高階管理碩士在職專班(EMBA)
101
In recent years, using remanufactured vehicle products (vehicle starter motor ＆ alternator) has become a mainstream for vehicle maintenance and repair, in which remanufactured vehicle products in the lower of environmental pollution than new vehicle products. Therefore, this study intended to analyze the decisive factors of consumers applied remanufactured products or new products. The main purpose of this study was to examine the behavior analysis of consumers choosing remanufactured products on environmental awareness, perceived value, brand image and brand trust. The questionnaire of this study was composed of six parts: environmental awareness, perceived value, brand image, brand trust, use behavior, and preliminary data. A total of 400 questionnaires were issued to the consumers surveyed and 400 valid questionnaires were returned. EViews statistical software was employed to conduct research analysis, building Linear Probability Model (LPM) to probe into it. The primary conclusion of the study verified: 1) Environmental awareness had positive influence on brand trust. 2) Perceived value had positive influence on brand trust. 3) Brand image had positive influence on brand trust. 4) Brand trust had positive influence on used remanufactured vehicle products.
40
Agostinho, Pedro Daniel Nunes. "A automação como suporte ao arranque e controlo de velocidade do motor de indução." Master's thesis, 2009. http://hdl.handle.net/10400.6/3564.
Full textAbstract:
Este trabalho tem como objectivo principal o desenvolvimento do arranque e controlo de velocidade do motor de indução utilizando técnicas de automação. Efectuou-se inicialmente um estudo sobre o motor e as suas características, bem como as técnicas tradicionais de controlo. Numa fase posterior contrapôs-se as técnicas tradicionais de controlo do motor de indução com os dispositivos electrónicos actuais, quer seja, o soft-starter como também o inversor de frequência.
Foi estudado também o soft-starter, o inversor de frequência, bem como o autómato, com vista a implementação prática. Implementação essa realizada de forma genérica, ou seja, com a possibilidade de se adaptar aos mais diversos processos, quer industriais ou comerciais.
Desta forma aperfeiçoamos a automação do arranque e controlo de velocidade do motor de indução presente em muitos processos industriais. Consequentemente optimizamos os processos industriais e com isso aumentamos a segurança, produtividade e qualidade do produto final.The aim of this work is to develop the start and speed control of an induction motor using automation techniques. First, a study was carried on the motor and its characteristics, as well as the traditional control techniques. Later, traditional control techniques of the induction motor were compared to current electronic devices, both in terms of the soft-starter and the variable speed drive. The soft-starter, the variable speed drive, as well as the programmable controller were also studied with a view to their implementation. The implementation was carried out in general, that is, with the possibility of adapting it to the most diverse industrial or commercial processes. Thus, we improved the automation of the start and speed control of the induction motor in many industrial processes. Consequently we optimized the industrial processes and thereby increased safety, productivity and the quality of the final product.
41
Oliveira, José Miguel Pinheiro. "Dispositivo eletrónico para melhoria do desempenho dos motores de indução trifásicos." Master's thesis, 2014. http://hdl.handle.net/1822/34480.
Full textAbstract:
Dissertação de mestrado em Engenharia MecatrónicaEstudos realizados por organizações internacionais comprovam que a maioria dos motores de indução trifásicos com rotor em gaiola de esquilo, com potências superiores a 4 kW e que funcionam com velocidade fixa1, utilizam o método de arranque estrelatriângulo. Nesta dissertação é proposto o desenvolvimento de um dispositivo eletrónico para seleção automática do tipo de ligação dos enrolamentos estatóricos dos motores de indução trifásicos com rotor em gaiola de esquilo, em função da sua carga. Este dispositivo é particularmente adequado para motores de média potência, com uma variação de carga significativa durante o seu ciclo de funcionamento, incluindo longos períodos de operação com carga baixa. A principal vantagem está no controlo automático do modo de ligação dos enrolamentos estatóricos, em estrela ou triângulo, em função da carga aplicada ao motor. Em aplicações de carga variável e velocidade fixa, este controlo permite melhorar significativamente o rendimento e fator de potência do motor. Tratando-se de um dispositivo de estado sólido, em que os contactores eletromecânicos são substituídos por eletrónica de potência, é possível minimizar o tempo de comutação, e consequentemente o deslizamento pela redução do tempo de comutação, relativamente à comutação estrela-triângulo convencional. A solução proposta permite também eliminar os três contactores utilizados nos arrancadores estrela-triângulo convencionais. Além disso, este dispositivo, caso seja instalado na caixa de terminais, como é o objetivo final, permite eliminar três dos seis condutores necessários para os arrancadores estrela-triângulo, traduzindo-se em poupanças muito significativas em cabos para novas instalações de motores. Adicionalmente, há um conjunto de funcionalidades que podem ser incorporadas no dispositivo como monitorização de consumos, proteção do motor e diagnósticos de avarias.
Studies by international organizations show that the majority of three-phase squirrel-cage induction motors, with an output power over 4 kW and running with fixed speed2, use the star-delta starting method. In this dissertation is proposed the development of an electronic device for automatic selection of connection type of stator windings of three-phase squirrel-cage induction motors, depending on their load. This device is particularly suitable for medium power motors, with a significant load variation during operation cycle, including long periods of operation at low load. The main advantage is the automatic control of the connection mode of the stator windings in star or delta, depending on the load applied to the motor. In variable load and fixed speed applications, this control allows to significantly improve the efficiency and power factor motor. Being a solid state device, in which the electromechanical contactors are replaced by power electronics, it is possible to minimize the switching time, and thus slip reducing the switching time, relative to the conventional star-delta switching. The proposed solution also eliminates the three contactors used in conventional star-delta starters. In addition, this device, if installed in the terminal box, which is the final objective, allows to eliminate three of the six conductors required for the star-delta starters, resulting in very significant savings in cables for new motor installations. Additionally, there is a set of features that can be incorporated into the device as monitoring of consumption, motor protection and fault diagnostics.
42
LI, GING-MAO, and 李慶茂. "A soft-starter for three-phase induction motors." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/12021997112026497314.
Full text
43
"Startle Distinguishes Task Expertise." Master's thesis, 2018. http://hdl.handle.net/2286/R.I.49014.
Full textAbstract:
abstract: Recently, it was demonstrated that startle-evoked-movements (SEMs) are present during individuated finger movements (index finger abduction), but only following intense training. This demonstrates that changes in motor planning, which occur through training (motor learning - a characteristic which can provide researchers and clinicians with information about overall rehabilitative effectiveness), can be analyzed with SEM. The objective here was to determine if SEM is a sensitive enough tool for differentiating expertise (task solidification) in a common everyday task (typing). If proven to be true, SEM may then be useful during rehabilitation for time-stamping when task-specific expertise has occurred, and possibly even when the sufficient dosage of motor training (although not tested here) has been delivered following impairment. It was hypothesized that SEM would be present for all fingers of an expert population, but no fingers of a non-expert population. A total of 9 expert (75.2 ± 9.8 WPM) and 8 non-expert typists, (41.6 ± 8.2 WPM) with right handed dominance and with no previous neurological or current upper extremity impairment were evaluated. SEM was robustly present (all p < 0.05) in all fingers of the experts (except the middle) and absent in all fingers of non-experts except the little (although less robust). Taken together, these results indicate that SEM is a measurable behavioral indicator of motor learning and that it is sensitive to task expertise, opening it for potential clinical utility.Dissertation/Thesis
Masters Thesis Biomedical Engineering 2018
44
Pan, Ying-jun, and 潘盈君. "A Study on Startup Strategy for Sensorless Brushless DC Motor Drive." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/fzswbd.
Full textAbstract:
碩士國立中央大學
電機工程學系
103
Via the relationship between line-to-line voltage and zero crossing points of back electromotive force, the thesis is aimed at designing Hall signal estimation circuit and replacing the original Hall effect sensors to provide the information of the rotor position and rotor speed. Besides, there is no signal of back electromotive force in open-loop start-up in motors, the thesis then additionally join a start-up strategy, which uses the stationary start-up method and combines a stationary current, then drive the rotor by means of six-step square wave starting until the back EMF is enough to estimate an accurate signal, and change to closed-loop control system, in order to intensify the robustness and avoids over-current problems during open-loop start-up. A digital signal processor, which combines intelligent power module and Hall signal estimation circuit as a foundation, is the main nucleus in the whole systematic structure. As the experimental results, this study implement a senseless brushless dc motor drive can achieve both circuit simplification and reduction of developing cost of the system.
45
Hsueh, Bo-Ren, and 薛博仁. "Dynamic Responses of a Manipulator-Motor Coupled System during Startup and Locking." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/01194805718010584501.
Full textAbstract:
碩士國立高雄第一科技大學
機械與自動化工程所
90
This study investigates the dynamic responses of a two-link rigid-flexible manipulator driven by a separately excited d-c motor. The governing equations, formulated by Hamilton’s principle, include effects of mass, inertia and flexible properties of a flexible beam, and the motor electric input and rotational damping. It is found that the governing equations are nonlinear coupling between the rigid-body motion and flexible vibration. The dimensionless form is employed to study the parameter behavior. The partial differential equations are reduced to the ordinary differential equations by Galerkin’s method. Finally, the numerical results are provided to show the motion-induced vibrations, when the system undergoes startup and locking.
46
Παπαδόπουλος, Βασίλειος. "Μελέτη συστήματος παροχής ηλεκτρικών τάσεων σε εργαστηριακό χώρο : παρεμβάσεις σε σύστημα ελέγχου PLC μέσω του προγράμματος SCADA." Thesis, 2008. http://nemertes.lis.upatras.gr/jspui/handle/10889/1811.
Full textAbstract:
Το έτος 1987 στο Τμήμα Ηλεκτρολόγων Μηχανικών και Τεχνολογίας Υπολογιστών του Πανεπιστήμιου Πατρών και συγκεκριμένα στο Εργαστήριο Ηλεκτρομηχανικής Μετατροπής Ενέργειας του Τμήματος Ηλεκτρολόγων Μηχανικών, στα πλαίσια εκπαιδευτικών και ερευνητικών σκοπών, εγκαταστάθηκε ένα πλήρες αυτοματοποιημένο σύστημα παράγωγης και παροχής ηλεκτρικών τάσεων. Σκοπός του συστήματος ήταν η παροχή 10 διαφορετικών τύπων τάσεων σε 15 συγκεκριμένες θέσεις εργασίας στο χώρου του Εργαστηρίου. Το σύστημα ήταν πλήρως αυτοματοποιημένο, καθώς χρησιμοποιήθηκε προγραμματιζόμενος λογικός ελεγκτής (PLC) που ήταν επιφορτισμένος με τον έλεγχο, την εποπτεία και τη διαχείριση του Συστήματος. Επίσης υπήρχε προσωπικός Η/Υ άμεσα συνδεδεμένος στο σύστημα, μέσω του όποιου ο διαχειριστής του μπορούσε να παρακολουθεί, να διαχειρίζεται και να διανέμει τον κάθε τύπο από τις προσφερόμενες παροχές. Το σύστημα με την πάροδο του χρόνου εμφάνισε βασικά λειτουργικά προβλήματα, με αποτέλεσμα να μειωθεί δραστικά ο αριθμός των παρεχόμενων τύπων τάσεων, αλλά και η ικανότητα διαχείρισης και διανομής αυτών που παρέχονταν. Πιο συγκεκριμένα, το τμήμα τoυ προγραμματιζόμενoυ λογικού ελεγκτή (PLC) και του συνδεδεμένου Η/Υ του συστήματος ουσιαστικά και πρακτικά είχε τεθεί πλέον πλήρως εκτός λειτουργίας. Στόχος και σκοπός της παρούσας εργασίας ήταν η λύση των προβλημάτων του προαναφερθέντος συστήματος με τελικό αποτέλεσμα την κανονική και ομαλή λειτουργία του. Η λύση που προτείνεται είναι η υλοποίηση και η ενσωμάτωση ενός σύγχρονου δικτύου αυτοματισμού με τη χρήση σύγχρονων PLC (επιλέχθηκε η εταιρεία OMRON) καθώς και η ενσωμάτωση ενός συστήματος εποπτικού και διαχειριστικού ελέγχου, λογισμικό τύπου SCADΑ της ίδιας εταιρείας. Αναλύονται διεξοδικά τόσο ο τρόπος παραγωγής των τάσεων με τα αντίστοιχα κυκλώματα ισχύος όσο και ο τρόπος διανομής και διαχείρισης αυτών με τα αντίστοιχα κυκλώματα αυτοματισμού. Εμπεριέχονται εκτενείς αναφορές στα σύγχρονα PLC, στον τρόπο λειτουργίας και προγραμματισμού τους καθώς και ο τρόπος με τον οποίο είναι δυνατό να ενσωματωθούν και να λειτουργήσουν πλήρως στο υπάρχον σύστημα. Γίνεται μια εισαγωγή στα σύγχρονα συστήματα διαχείρισης και εποπτικού ελέγχου (SCADA) ώστε να μπορεί ο κάθε αναγνώστης, χωρίς να χρειάζονται υψηλού επιπέδου γνώσεις, να κατανοήσει τη χρησιμότητα και τη λειτουργία τους και μελετείται ο τρόπος με τον οποίο θα υλοποιηθεί το παραπάνω δίκτυο αυτοματισμού με τη χρήση των PLC και με την παρουσία του εποπτικού συστήματος SCADA. Γίνεται πλήρης αναφορά σε έναν πολύ βασικό τομέα του Ηλεκτρολόγου Μηχανικού στη σύγχρονη εποχή: τον υπολογισμό κόστους προμήθειας, εγκατάστασης και κατασκευής όλων των στοιχείων του εγχειρήματος και μελετούνται όλες οι παράλληλες επιλογές για την καλύτερη δυνατή λειτουργία του και την περαιτέρω ανάπτυξη και βελτίωση του.The year 1987 in the Department of Electrical and Computer Engineering University of Patras and specifically in Electromechanical Energy Conversion Laboratory Department of Electrical Engineering, in educational and research purposes, installed a complete automated system for producing and providing electrical voltages. This system was able to provide 10 different types of voltages in 15 stations in the area of Laboratory. The system was fully automated, used a Programmable Logic Controller (PLC), which was responsible for monitoring, supervision and management system. Also there was a PC directly connected to the system, through which the administrator can monitor, manage and distribute each type of voltage. The system through the walking time showed major operational problems. As a result, the number of the types of voltages and the ability to manage and distribute those provided reduced drastically. Specifically, the part of programmable logic controller (PLC) and the connected computer system effectively and practically has run out of order. The purpose of this work was the solution of problems of the system and ultimately with final result the normal and smooth operation. The solution proposed is the implementation and integration of a modern network automation using modern PLC (the company chosen is OMRON) and the incorporation of a supervisory control and data acquisition application and (SCADA) software of the same company. Analyzed in detail both the production voltages with the respective power circuits and the method of distribution and management of the automation circuits. Contained extensive references to contemporary PLC, in operations and programming, and how it is possible to integrate and operate fully in the existing system. There is an introduction to SCADA to enable each reader without the need for high-level knowledge to understand the utility and operation, and considering how we implement the above automation network using a PLC and SCADA application. We mention a very important area of Electrical Engineering in the modern era: counting the cost of supply, installation and construction of all elements of the project and consider all parallel options for optimal operation and further development and improvement.
47
Ke, Bo-Hao, and 柯柏豪. "Startup Strategy and System Test for Brushless Excited Synchronous Wind Power Generators with Servo Motor Control." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3j8jf8.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
106
This thesis proposes the wind power system which uses the excited brushless synchronous generator and the coaxial-coupled servo motor as the main structure. To verifies the structure of Direct Grid-connected Excited Synchronous Wind Power System in ACDC Motors Labs is feasible, the servo motor can adjust the phase and frequency of the generator output to reach the requirement of grid connection, while continuously correcting the power factor after the grid is connected. Also, the excited brushless synchronous generator is used to analyze another system--Stand-Alone Excited Synchronous Wind Power System. Fixed-Voltage Control Strategy adjusts the generator output voltage to a constant value by controlling the excited current. Furthermore, The Power Flow Management Strategy is used to distribute the wind energy properly and achieve maximum efficiency. This thesis also proposes a two-stage startup control strategy. Firstly, the 1 st -stage startup strategy sets the generator in the fixed excited mode and makes the motor speed follow the torque of motor output in order to increase and decrease the speed of motor. Therefore, the servo motor consumes almost no power. Secondly, when the system speed rises until the generator output power can be adjusted by the load, it enters the 2 nd -stage startup strategy. The generator mode is switched from the fixed excited mode to the maximum power tracking mode and speeds up the system to the rated speed. Additionally, this thesis provides a strategy which can keep the system from the sudden unintended acceleration and work smoothly.
48
Jacob, Marta Pereira. "Estrutura de um novo conceito de parapente motorizado." Master's thesis, 2014. http://hdl.handle.net/10400.6/5273.
Full textAbstract:
O presente trabalho tem como objetivo o estudo estrutural de um novo paramotor
elétrico/motor elétrico auxilifar, chamado Start-E, com o propósito deste ser aprovado pela
circular 34864 Ultra Leves Motorizados, como paramotor, para mais tarde ser comercializado
como tal.
Para esse estudo foram realizados vários ensaios práticos.
Os ensaios práticos foram realizados num protótipo. Este foi testado com cargas reais a fim de
perceber se obedece aos requisitos estipulados pela circular 34864ULM, nomeadamente o
fator de carga mínima até ao qual a estrutura não apresenta deformação (3.5g). O protótipo
tolerou uma carga correspondente ao fator de carga de 6g após a qual se observou uma
deformação plástica. Quando se aumentou o fator de carga para 9g, este sofreu uma micro
rutura.
Para além destes ensaios, também foi iniciado um estudo não conclusivo de análise numérica
a uma nova estrutura.
Através dos resultados obtidos nos ensaios práicos, verificou-se que o primeiro protótipo do
Start-E cumpre com sucesso os requisitos da circular estudados, podendo vir a ser considerado
uma aeronave ultra leve motorizado.The aim of this work is to study the structure of a new electric paramotor /auxiliary electric motor, called Start-E, with the purpose of this being approved by circular 34864 Ultra Lightweight Motorized, as paramotor, so that later it may be marketed as such. For this study were performed several experimental tests. The experimental tests were carried out on a prototype. This has been tested with real loads in order to see if it meets the requirements set forth by circular 34864ULM, in particular the fator of minimum load at which the structure has demonstrate no plastic deformation (3.5g). The prototype has tolerated a load corresponding to the load fator of 6g after which there was a plastic deformation. When the load factor for 9g, this suffered a micro break. In addition to these tests, a study was initiated not conclusive of numerical analysis to a new structure Using the results obtained in these tests, it was found that the first prototype of the Start-E successfully meets the requirements of the circular studied, it may be considered an aircraft ultra light motorized.
49
Le, Duc Jolyanne. "Modulation du réflexe acoustique de sursaut et de l’inhibition par le prépulse : une comparaison entre les jeunes adultes et les âgés." Thèse, 2013. http://hdl.handle.net/1866/10619.
Full textAbstract:
Une des théories actuellement prépondérante pour expliquer le déclin cognitif observé chez les personnes âgées est une perte généralisée de la fonction inhibitrice. En revanche, de plus en plus d’études révèlent un maintien et même un gain sur le plan émotionnel chez les âgés. Afin de caractériser l’effet de l’âge sur la fonction inhibitrice et sur les émotions, nous avons utilisé le paradigme bien connu du réflexe acoustique de sursaut et de son inhibition par le prépulse, un phénomène reconnu comme reflétant le filtrage sensorimoteur, soit une mesure pré-attentionnelle d’inhibition. Le réflexe acoustique de sursaut est une réponse du corps tout entier à un bruit fort et inattendu et a été mesuré via la magnitude et la latence du clignement des yeux. La présentation d’un son faible (prépulse) quelques millisecondes avant le bruit de sursaut réduit la réponse de sursaut. Deux groupes de participants (jeunes adultes et âgés) ont visionné des images plaisantes, neutres et déplaisantes issues du International Affective Picture System (IAPS), lesquelles étaient associées à des stimuli auditifs évaluant le réflexe acoustique de sursaut et son inhibition par le prépulse. Les résultats démontrent que le réflexe de sursaut est modulé différemment par les émotions chez les jeunes adultes et les âgés. Plus particulièrement, les adultes âgés ont un plus grand réflexe de sursaut que les jeunes adultes lorsqu’ils visionnent des images plaisantes et neutres. Le processus d’inhibition par le prépulse est également modulé différemment par les émotions chez les âgés et les jeunes adultes: les âgés ont une plus grande inhibition du réflexe de sursaut que les jeunes adultes lorsqu’ils visionnent des images plaisantes et déplaisantes, mais ils ne diffèrent pas des jeunes adultes pour les images neutres. Dans l’ensemble, les résultats obtenus ne sont pas compatibles avec une perte d’inhibition chez les adultes âgés, et supportent plutôt un biais émotionnel positif.Aging is often characterized by a decline in cognitive abilities and a loss of inhibitory function. At the same time there is promising, yet limited to date, evidence of a better emotion regulation with aging. In order to characterize the effect of age on inhibitory function and emotions, in this study the well-known acoustic startle paradigm and its inhibition by a prepulse, a phenomenon known to engage sensorimotor gating, were used. The acoustic startle reflex, a whole-body reflex in response to a loud and unexpected sound, was measured through eye blink magnitude and latency. The inhibition of this acoustic startle response by the presentation of a weak sound, a prepulse, was also measured. Two groups of 30 adults (young and older adults) viewed pleasant, neutral, and unpleasant images from the International Affective Picture System (IAPS) while startle and prepulse trials were presented. The results show that the startle response is differently modulated in the two groups, with the elderly displaying a greater startle reflex while viewing pleasant and neutral pictures compared to young adults. Prepulse inhibition is also differently modulated by emotions in young adults and their older counterparts, with the latter exhibiting a greater inhibition of the startle reflex when viewing pleasant and unpleasant pictures (but not for neutral pictures) compared to young adults. In summary, the present data do not support a decline of the inhibitory function with increasing age, but rather support a positivism effect.