Log in

Relevant bibliographies by topics / AC Drives / Dissertations / Theses

To see the other types of publications on this topic, follow the link: AC Drives.

Dissertations / Theses on the topic 'AC Drives'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'AC Drives.'

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

ODHANO, SHAFIQ AHMED. "Self-Commissioning of AC Motor Drives." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2543100.

Full text

Abstract:

In modern motion control and power conversion applications, the use of inverter-fed electrical machines is fast growing with continuous development in the field of power electronics and drives. The Variable Voltage Variable Frequency (VVVF) supply for electrical machines gives superior performance in terms of speed control, efficiency and dynamics compared to the machines operated directly from the mains. In one of the most basic configurations, a drive system consists of a closed loop speed control that has a current controller inside the loop. For effective and stable current control, the co

APA, Harvard, Vancouver, ISO, and other styles

2

Pickert, Volker. "Assessment of novel power electronic converters for drives applications." Thesis, University of Newcastle Upon Tyne, 1999. http://hdl.handle.net/10443/498.

Full text

Abstract:

In the last twenty years, industrial and academic research has produced over one hundred new converter topologies for drives applications. Regrettably, most of the published work has been directed towards a single topology, giving an overall impression of a large number of unconnected, competing techniques. To provide insight into this wide ranging subject area, an overview of converter topologies is presented. Each topology is classified according to its mode of operation and a family tree is derived encompassing all converter types. Selected converters in each class are analysed, simulated a

APA, Harvard, Vancouver, ISO, and other styles

3

Alam, S. M. Mahfuz. "Direct Torque Control of AC Machine Drives." Thesis, Southern Illinois University at Edwardsville, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10128872.

Full text

Abstract:

<p> Field oriented control (FOC) and direct torque control (DTC) are the two most important control strategies for modern advanced machine drives. Field oriented control (FOC) has been widely used as the industrial motor drives. The direct torque control has been recently developed by Takashi and has shown great potential in machine drive applications. This thesis discusses the performances of direct torque control on AC machine drives including the industrial workhorse induction machines (IM) and permanent magnet synchronous machines (PMSM). Both of the IM and PMSM dynamics models are derived

APA, Harvard, Vancouver, ISO, and other styles

4

Dordevic, Obrad. "PWM strategies fo multilevel multiphase AC drives." Thesis, Liverpool John Moores University, 2013. http://researchonline.ljmu.ac.uk/6188/.

Full text

Abstract:

Pulse width modulation (PWM) strategies for multilevel multiphase ac drives have been analysed in this thesis. The large amount of published work in the area of multiphase drives recognises their advantages compared to the standard three-phase solutions. Some of them arc improved power sharing capabilities, increased reliability and fault tolerance. However, in the most of these works two-level inverters were used for supply of multiphase machine. Also, huge amount of research has been done in the area of multi level inverters. Nowadays, three-phase multilevel inverters are in use in high-powe

APA, Harvard, Vancouver, ISO, and other styles

5

Selhi, Hocine. "Simulation of transients in AC traction systems." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282843.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Larbes, Cherif. "Boost modulation : control of AC variable speed drives." Thesis, Lancaster University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304281.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Kwak, Sangshin. "Design and analysis of modern three-phase AC/AC power converters for AC drives and utility interface." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2336.

Full text

Abstract:

Significant advances in modern ac/ac power converter technologies and demands of industries have reached beyond standard ac/ac power converters with voltage-source inverters fed from diode rectifiers. Power electronics converters have been matured to stages toward compact realization, increased high-power handling capability, and improving utility interface. Modern ac/ac power converter topologies with various control strategies have been introduced for the further improvements, such as matrix converters, current-fed converters, PWM rectifiers, and active power filters. In this dissertation, s

APA, Harvard, Vancouver, ISO, and other styles

8

Petrarca, Ivan. "Unified analysis and operating point calculation of AC drives." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

Find full text

Abstract:

Sommario La seguente tesi si basa sulla modellizzazione di un generico motore elettrico trifase, nel corso della trattazione è stata svolta un’analisi unificata di questo problema in modo da poter includere nel modello motori asincroni e brushless anche molto diversi tra loro semplicemente cambiando i parametri iniziali. Considerato un veicolo elettrico, quando si agisce sul pedale dell’ acceleratore viene generato un riferimento di coppia per soddisfare le richieste del guidatore, in genere la coppia di riferimento viene soddisfatta per mezzo di regolatori PI, tuttavia questo modello può and

APA, Harvard, Vancouver, ISO, and other styles

9

Allaith, Noori A. "Intelligent power module for variable speed AC motor drives." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361134.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Wheeler, Patrick W. "A matrix converter for variable speed AC motor drives." Thesis, University of Bristol, 1993. http://hdl.handle.net/1983/1eec4275-808a-4125-813b-4f6e00881f44.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Pietiläinen, Kai. "Voltage sag ride-through of AC drives : control and analysis." Doctoral thesis, KTH, School of Electrical Engineering (EES), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-450.

Full text

Abstract:

<p>This thesis focuses on controller design and analysis for induction motor (IM) drives, flux control for electrically excited synchronous motors with damper windings (EESMs), and to enhance voltage sag ride-through ability and analysis for a wind turbine application with a full-power grid-connected active rectifier. The goal is to be able to use the existing equipment, without altering the hardware. Further, design and analysis of the stabilization of DC-link voltage oscillations for DC systems and inverter drives is studied, for example traction drives with voltage sags in focus.</p><p>The

APA, Harvard, Vancouver, ISO, and other styles

12

Pietiläinen, Kai. "Voltage sag ride-through of AC drives : control and analysis /." Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-450.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Odiete, G. C. E. "AC voltage adjustment and controlled compensation of electrical power drives." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373229.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

PASQUALOTTO, DARIO. "Towards more autonomous and intelligent industrial AC drives for Mechatronics." Doctoral thesis, Università degli studi di Padova, 2022. http://hdl.handle.net/11577/3443504.

Full text

Abstract:

The modern industrial world calls for efficient, reliable and safe systems. A contribution to the solution to all these problems is the predictive maintenance. According to this trend and tailoring the analysis to the electric drives field, this thesis performs a step forward for the realization of more reliable drives through their condition monitoring. Different AC motors have been considered in the dissertation: Permanent Magnet Synchronous Motors, Induction Motors and Synchronous Reluctance Motors, covering the actual and also the next future industrial drives scenario. Some of the more re

APA, Harvard, Vancouver, ISO, and other styles

15

Venugopal, S. "Study On Overmodulation Methods For PWM Inverter Fed AC Drives." Thesis, Indian Institute of Science, 2006. https://etd.iisc.ac.in/handle/2005/278.

Full text

Abstract:

A voltage source inverter is commonly used to supply a variable frequency variable voltage to a three phase induction motor in a variable speed application. A suitable pulse width modulation (PWM) technique is employed to obtain the required output voltage in the line side of the inverter. Real-time methods for PWM generation can be broadly classified into triangle comparison based PWM (TCPWM) and space vector based PWM (SVPWM). In TCPWM methods such as sine-triangle PWM, three phase reference modulating signals are compared against a common triangular carrier to generate the PWM signals fo

APA, Harvard, Vancouver, ISO, and other styles

16

Venugopal, S. "Study On Overmodulation Methods For PWM Inverter Fed AC Drives." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/278.

Full text

Abstract:

A voltage source inverter is commonly used to supply a variable frequency variable voltage to a three phase induction motor in a variable speed application. A suitable pulse width modulation (PWM) technique is employed to obtain the required output voltage in the line side of the inverter. Real-time methods for PWM generation can be broadly classified into triangle comparison based PWM (TCPWM) and space vector based PWM (SVPWM). In TCPWM methods such as sine-triangle PWM, three phase reference modulating signals are compared against a common triangular carrier to generate the PWM signals for

APA, Harvard, Vancouver, ISO, and other styles

17

Green, Simon Richard. "Permanent magnet drives in the more-electric aircraft." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327196.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Gitau, Michael N. "Optimal PWM switching strategy for single-phase AC-DC converters." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/7205.

Full text

Abstract:

The thesis describes an optimal selective harmonic elimination strategy suitable for singlephase AC-DC converter-fed traction drives. The objective is to eliminate low-order supply current harmonics, including those injected into the supply due to load-side current ripple. Other advantages that the switching strategy has to offer over phase-control include improved supply power factor, reduced VA consumption for a given demand speed and load, reduced torque and speed ripple and smaller armature circuit smoothing inductance. The effect of field current boost on the dynamic response of the drive

APA, Harvard, Vancouver, ISO, and other styles

19

Purcell, Anthony. "New switching techniques for direct torque controlled induction motor drives." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285275.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Mathapati, Shashidhar [Verfasser], and Joachim [Akademischer Betreuer] Böcker. "FPGA-based high performance AC drives / Shashidhar Mathapati. Betreuer: Joachim Böcker." Paderborn : Universitätsbibliothek, 2011. http://d-nb.info/1033765074/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Abdessemed, Yassine. "The application of GTO thyristor in PWM variable-speed AC drives." Thesis, University of Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332278.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Gurian, Sanford. "Resonance Compensation of Large AC Drivetrains with Significant Time Lag." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/31061.

Full text

Abstract:

AC main drives, such as cycloconverters, offer the possibility of higher speed and torque response over their DC counterparts. The price to be paid, however, is torque ripple which is a function of the operating frequency. Even a small value of ripple, at an underdamped plant resonant frequency, may be multiplied by the plant "Q" to a large enough value to cause trouble. Typical classical approaches used in the rolling mill industry to deal with mechanical resonance tend to fall apart with large values of time lag. We investigate a modified LQR/LQE approach using a torque sensor as the fee

APA, Harvard, Vancouver, ISO, and other styles

23

Morton, Graham H. "Performance comparison and simulation of permanent magnet AC drives and parameter estimation techniques." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/3790/.

Full text

Abstract:

This thesis presents research on common PWM switching strategies implemented with permanent magnet AC machine drives. This study also considers online parameter estimation techniques that can be implemented with such drives. Finally a new simulation model of the drive and tools for modelling the specific machine under test are presented. Initially the research focuses on comparisons of the performance parameters which are influenced by the differences in current control strategies. Bang-Bang, PI and SVPWM controllers are the three alternative switching strategies which are discussed and then e

APA, Harvard, Vancouver, ISO, and other styles

24

Park, Joon B. "Fault-Tolerant Nonlinear Estimator-Based Direct Torque Control of Sensorless AC Motor Drives." Thesis, Southern Illinois University at Edwardsville, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10982121.

Full text

Abstract:

<p> The advancement of sophisticated power electronics technology and high expectation of sensing reliability attribute to the rapid deployment of sensorless-control of AC motor drives. The purpose of this thesis is to provide the comparative studies of the extended Kalman filter (EKF), the fault tolerant extended Kalman filter (FTEKF), and the unscented Kalman filter (UKF)-based sensorless direct torque control approaches for permanent magnet AC motor (PMAC) and induction motor (IM) drives to improve Kalman filtering based state-estimation performances during external disturbances, noise and

APA, Harvard, Vancouver, ISO, and other styles

25

Konghirun, Mongkol. "Fast-transient current control strategy and other issues for vector controlled ac drives." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1070302487.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Liu, Yong. "Direct torque control of permanent magnet brushless AC/DC drives with reduced torque ripple." Thesis, University of Sheffield, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.630444.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Hewson, Chris R. "Dynamometer emulation of dynamic mechanical loads for testing and commissioning of AC motor drives." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301665.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Patkar, Fazlli. "PWM techniques for control of dual-inverter supplied six-phase drives." Thesis, Liverpool John Moores University, 2013. http://researchonline.ljmu.ac.uk/4463/.

Full text

Abstract:

Among the different multiphase ac drive solutions, one of the most widely reported in the literature is the six-phase machine. The machines can be realised into two different configurations, symmetrical and asymmetrical. For the symmetrical configuration, the stator winding consists of two sets of three-phase windings that are spatially shifted by 60 degrees where spatial displacement between any two consecutive phases is the same and equal to 60 degrees. For the asymmetrical configuration, the two sets of three-phase windings are spatially shifted by 30 degrees. As a result, the spatial shift

APA, Harvard, Vancouver, ISO, and other styles

29

Elwakil, Ehab. "A new converter topology for high-speed high-starting-torque three-phase switched reluctance motor drive system." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/3009.

Full text

Abstract:

Switched reluctance motor (SRM) has become a competitive selection for many applications of electric machine drive systems recently due to its relative simple construction and its robustness. The advantages of those motors are high reliability, easy maintenance and good performance. The absence of permanent magnets and windings in rotor gives possibility to achieve very high speeds (over 10000 rpm) and turned SRM into perfect solution for operation in hard conditions like presence of vibrations or impacts. Such simple mechanical structure greatly reduces its price. Due to these features, SRM d

APA, Harvard, Vancouver, ISO, and other styles

30

RUFFO, RICCARDO. "Motor Overvoltage and Power Losses Analysis in Industrial AC Drives Based on Si and SiC Devices." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2743227.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Aban, Vahap Volkan. "The Design, Control, And Performance Analysis Of Ac Motor Drives With Front End Diode Rectifier Utilizing Low Capacitance Dc Bus Capacitor And Comparison With Conventional Drives." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615099/index.pdf.

Full text

Abstract:

In this thesis the design, control, stability, input power quality, and motor drive performance of ac motor drives with front end three phase diode rectifiers utilizing low capacitance dc bus capacitor are investigated. Detailed computer simulations of conventional motor drives with diode rectifier front end utilizing high capacitance dc bus capacitor and the drives with low capacitance dc bus capacitor are conducted and the performances are compared. Performance evaluation of various active control methods found in previous studies aiming to provide the dc bus stability of drives with low cap

APA, Harvard, Vancouver, ISO, and other styles

32

Awan, Ahmed-Bilal. "Contribution à l’étude de la stabilité des systèmes électriques distributés autour d’un bus commun d'alimentation." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL099N/document.

Full text

Abstract:

La stabilité est un facteur très important dans tous les modes de fonctionnement pour un Système à Puissance Distribué (SPD). En SPD, les charges sont connectées au bus DC à travers d’un filtre entré LC. La plupart des charges de SPD d'avions présents une caractéristique de charge à puissance constante dans un domaine de fonctionnement dans laquelle ils sont étroitement contrôlés. Ainsi, elles peuvent être modélisées comme une résistance négative. Changement de la charge dans un sous-système peut conduire un système stable dans l'instabilité.Une solution pratique pour diminuer le risque d'inst

APA, Harvard, Vancouver, ISO, and other styles

33

Antonopoulos, Antonios. "On the Internal Dynamics and AC-Motor Drive Application of Modular Multilevel Converters." Doctoral thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156200.

Full text

Abstract:

This thesis is an effort to investigate the operation and the performanceof modular multilevel converters (M2Cs). Proven to be the most promisingtopology in high-voltage high-power applications, it is necessary to put aneffort in understanding the physical laws that govern the internal dynamicsof such converters, in order to design appropriate control methods. AlthoughM2Cs belong to the well-studied family of voltage-source converters (VSCs),and claim a modular structure, their control is significantly more complicatedcompared to two- or three-level VSCs, due to the fact that a much highernumb

APA, Harvard, Vancouver, ISO, and other styles

34

Ali, Emad, Jürgen Weber, and Matthias Wahler. "A Machine Learning Approach for Tracking the Torque Losses in Internal Gear Pump - AC Motor Units." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199438.

Full text

Abstract:

This paper deals with the application of speed variable pumps in industrial hydraulic systems. The benefit of the natural feedback of the load torque is investigated for the issue of condition monitoring as the development of losses can be taken as evidence of faults. A new approach is proposed to improve the fault detection capabilities by tracking the changes via machine learning techniques. The presented algorithm is an art of adaptive modeling of the torque balance over a range of steady operation in fault free behavior. The aim thereby is to form a numeric reference with acceptable accura

APA, Harvard, Vancouver, ISO, and other styles

35

Awan, Ahmed-Bilal. "Contribution à l’étude de la stabilité des systèmes électriques distributés autour d’un bus commun d'alimentation." Electronic Thesis or Diss., Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL099N.

Full text

Abstract:

La stabilité est un facteur très important dans tous les modes de fonctionnement pour un Système à Puissance Distribué (SPD). En SPD, les charges sont connectées au bus DC à travers d’un filtre entré LC. La plupart des charges de SPD d'avions présents une caractéristique de charge à puissance constante dans un domaine de fonctionnement dans laquelle ils sont étroitement contrôlés. Ainsi, elles peuvent être modélisées comme une résistance négative. Changement de la charge dans un sous-système peut conduire un système stable dans l'instabilité.Une solution pratique pour diminuer le risque d'inst

APA, Harvard, Vancouver, ISO, and other styles

36

Athanasiadis, Nikolaos P. "Modelling, control and design of Flexible AC Transmission Systems (FACTS), custom power devices and variable speed drives for transmission and distribution architectures." Thesis, University of Strathclyde, 1999. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21441.

Full text

Abstract:

The main tasks of power electronics in power transmission and distribution systems is to process and control the flow of electric energy by supplying voltages and currents in a form that is suitable for user loads. In recent years, the field of power electronics has experienced a large growth. Electric utilities expected that by the year 2000 over half of the electrical load may be supplied through power electronic systems. In order to take advantage of this highly developed technology a number of detailed modelling procedures and simulation facilities are needed. The work in this thesis is co

APA, Harvard, Vancouver, ISO, and other styles

37

Moon, Seung Ryul. "Hybrid PWM Update Method for Time Delay Compensation in Current Control Loop." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/84929.

Full text

Abstract:

A novel hybrid pulse-width modulation (PWM) update method is proposed to eliminate the effect of the one-step control time delay Td one without losing the full duty cycle range. Without the Td one to cause linear phase shifts that limit the control bandwidth and affect closed-loop stability, a very high quality digital current control can be achieved, such as a high closed current loop bandwidth, strong robustness against disturbances, ability to reach a very high fundamental frequency compared to switching frequency, etc. In a conventional digital control implementation, a sampling period (

APA, Harvard, Vancouver, ISO, and other styles

38

Narayanan, G. "Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives." Thesis, Indian Institute of Science, 1999. https://etd.iisc.ac.in/handle/2005/139.

Full text

Abstract:

In high power induction motor drives, the switching frequency of the inverter is quite low due to the high losses in the power devices. Real-time PWM strategies, which result in reduced harmonic distortion under low switching frequencies and have maximum possible DC bus utilisation, are developed for such drives in the present work. The space vector approach is taken up for the generation of synchronised PWM waveforms with 3-Phase Symmetry, Half Wave Symmetry and Quarter Wave Symmetry, required for high-power drives. Rules for synchronisation and the waveform symmetries are brought out. Th

APA, Harvard, Vancouver, ISO, and other styles

39

Narayanan, G. "Synchronised Pulsewidth Modulation Strategies Based On Space Vector Approach For Induction Motor Drives." Thesis, Indian Institute of Science, 1999. http://hdl.handle.net/2005/139.

Full text

Abstract:

In high power induction motor drives, the switching frequency of the inverter is quite low due to the high losses in the power devices. Real-time PWM strategies, which result in reduced harmonic distortion under low switching frequencies and have maximum possible DC bus utilisation, are developed for such drives in the present work. The space vector approach is taken up for the generation of synchronised PWM waveforms with 3-Phase Symmetry, Half Wave Symmetry and Quarter Wave Symmetry, required for high-power drives. Rules for synchronisation and the waveform symmetries are brought out. Thes

APA, Harvard, Vancouver, ISO, and other styles

40

Padalík, Michal. "Algoritmy odbuzování při řízení střídavých motorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217703.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Arafat, AKM. "ANALYSIS AND CONTROL OF FIVE-PHASE PERMANENT MAGNET ASSISTED SYNCHRONOUS RELUCTANCE MOTOR DRIVE UNDER FAULTS." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1524168102423576.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Mottaghi, Yashar, and Gabriel Adel. "Triac Driver Platform." Thesis, Linköpings universitet, Institutionen för systemteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-77806.

Full text

Abstract:

In the electronic industrials, power control of AC motors is commonly used. For example power control of a washing machine motor, a vacuum cleaner motor or a coffee machine motor. The company Rejlers Ingenjörer AB has many projects where power control of AC motors is included. A prototype card for this task can save time and money for the company in the future and this is the reason for this thesis. The motors are power controlled by a TRIAC and control of the trigging pulses to the TRIAC. This card is modularly built and can easily be adapted for future projects where the power control of AC

APA, Harvard, Vancouver, ISO, and other styles

43

Koteich, Mohamad. "Modélisation et observabilité des machines électriques en vue de la commande sans capteur mécanique." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC043/document.

Full text

Abstract:

Les stratégies de commande avancée des machines électriques nécessitent une connaissance précise de la position et/ou de la vitesse du rotor. Ces grandeurs mécaniques sont traditionnellement mesurées par des capteurs, ce qui augmente le coût et diminue la fiabilité et la robustesse du système. D’où l’importance de la commande sans capteurs mécaniques, dite commande sensorless : elle consiste à remplacer les capteurs physiques par un observateur d’état, qui estime les grandeurs mécaniques en se basant sur un modèle de la machine et à partir de ses entrées (tensions) et ses sorties (courants mes

APA, Harvard, Vancouver, ISO, and other styles

44

Herman, Ivo. "Algoritmy odhadu stavových veličin elektrických pohonů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219775.

Full text

Abstract:

This thesis deals with state estimation methods for AC drives sensorless control and with possibilities of the estimation. Conditions for observability for a synchronous drive were derived, as well as conditions for the moment of inertia and the load torque observability for both drive types - synchronous and asynchronous. The possibilities of the estimation were confirmed by experimental results. The covariance matrices for all filters were found using an EM algorithm. Both drives were also identified. The algoritms used for state estimation are Extended Kalman Filter, Unscented Kalman Filter

APA, Harvard, Vancouver, ISO, and other styles

45

吳熾華 and Che-wa Ng. "An advanced ac drive system for an electric van." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1990. http://hub.hku.hk/bib/B31231937.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Ng, Che-wa. "An advanced ac drive system for an electric van /." [Hong Kong : University of Hong Kong], 1990. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12691276.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Adabi, Firouzjaee Jafar. "Remediation strategies of shaft and common mode voltages in adjustable speed drive systems." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/39293/1/Jafar_Adabi_Firouzjaeel_Thesis.pdf.

Full text

Abstract:

AC motors are largely used in a wide range of modern systems, from household appliances to automated industry applications such as: ventilations systems, fans, pumps, conveyors and machine tool drives. Inverters are widely used in industrial and commercial applications due to the growing need for speed control in ASD systems. Fast switching transients and the common mode voltage, in interaction with parasitic capacitive couplings, may cause many unwanted problems in the ASD applications. These include shaft voltage and leakage currents. One of the inherent characteristics of Pulse Width Modu

APA, Harvard, Vancouver, ISO, and other styles

48

Skorcz, Alex Joseph. "Performance evaluation of an active filter non-regenerative AC drive." Thesis, Texas A&M University, 2007. http://hdl.handle.net/1969.1/85833.

Full text

Abstract:

The purpose of this work is to evaluate the performance of a specific ac drive topology that is of current interest in industry. With the increasing pressure for compliance with IEEE-519 and other international harmonic standards, many ac drive manufacturing companies are seeking innovative and cost effective solutions for controlling the amount of harmonics produced at the point of common coupling (PCC). The proposed topology is a potential alternative to the three-phase diode bridge which is the conventional rectifier topology for non-regenerative applications. The work of this thesis explai

APA, Harvard, Vancouver, ISO, and other styles

49

Chen, Tsung-Cheng, and 陳宗成. "New AC/AC converters and applications to induction motor drives." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/66972129215623540131.

Full text

Abstract:

博士<br>國立清華大學<br>電機工程研究所<br>82<br>Due to the academic value and the wide applications, the objective of this dissertation is centered around the study of AC to AC converters as well as the corresponding applications to induction motor drives. The main contributions of this disserta- tion are : (1) A new step up AC/DC converter is proposed as a pre-stage of the AC/AC converter to achieve high input power quality, bidirectional power flow, and very low output voltage ripple. (2)

APA, Harvard, Vancouver, ISO, and other styles

50

Lin, Ping-Yi, and 林秉毅. "Development of Field-Weakening Control Techniques for AC Drives." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/59pxg4.

Full text

Abstract:

博士<br>國立臺北科技大學<br>電機工程系博士班<br>101<br>The main theme of this dissertation is to develop field-weakening control techniques for AC Drives. It is well known that AC motors, such as induction motors (IMs), surface-mounted permanent magnet synchronous motors (SPMSMs), and interior permanent magnet synchronous motors (IPMSMs), have been investigated in this dissertation. The proposed new voltage control technique applies the switching period and active switching times of space vector modulation (SVM) for high speed region detection. As the summation of active switching times for PWM control of inver

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!