EPE Association: EPE 2023 - DS3j: Design, Optimisation and Control of Electric Drives

EPE 2023 - DS3j: Design, Optimisation and Control of Electric Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 05: Renewable Energy Power Systems > EPE 2023 - DS3j: Design, Optimisation and Control of Electric Drives

   [return to parent folder]

   A Development of Short-Time Initial Rotor Position Estimation Technique Based on the Magnetic Saturation and Saliency
By Hiroaki SATO, Shigehisa AOYAGI, Hirokazu MATSUI, Shun TANIGUCHI, Shunsuke OHARA [View]
[Download]

Abstract: This paper proposes initial rotor position estimation technique in three-phase permanent magnet synchronous motors (PMSMs) based on the magnetic saturation and saliency. Proposal technique extracts phase current dynamics caused by magnetic saturation and saliency respectively and simultaneously. Furthermore, this method has robustness against rotor position dependencies of d- and q-axis inductance. Therefore, this technique estimates initial rotor position accurately and shortly.

   Adaptive Control as a Hierarchical System
By Hussein ABUBAKR, Abderezak LASHAB, Saeed GOLESTAN, Abdullah M. ABUSORRAH, Muhyaddin J. H. RAWA, Mohammad YAQOOB, Juan C. VASQUEZ, Josep M. GUERRERO [View]
[Download]

Abstract: An adaptive control system is a system that can cope with variations in a plant where it plays a major role in smart controllers needed for sophisticated systems. In this study, the adaptive control system is represented as a hierarchical control structure consisting of primary, secondary, and supervisory levels to monitor the system performance and adjust controller parameters for system regulation and stability. To validate the adaptive control concept, a basic automatic voltage regulator model is employed as an example. System performance is assessed against the conventional feedback control system under different step perturbations. The results demonstrate the effectiveness of the proposed adaptation mechanism, acting as a secondary control loop, in achieving superior performance and stability compared to the conventional one.

   An Optimizing Method of Complex PI Controller for Permanent Magnet Synchronous Motor in Magnetic Saturation
By Chengyong LIN, Wenxi YAO, Zhihao SONG [View]
[Download]

Abstract: This paper analyses the stability margin of permanent magnet synchronous motor (PMSM)control system that uses a complex PI controller, specifically under high current conditions. Underhigh current conditions, the inductance of the motor sharply decreases. And if the bandwidth ofthe current controller is set high enough, stability issues arise. This paper examines the reasons forchanges in system stability and proposes a parameter design method to enhance stability.

   Capacitor Current Reduction in Dual Three-Phase PMSM Drive System by Model Predictive Control Considering Dead Time
By Ryosuke SAKAUCHI, Shinji DOKI, Koji IMAI, Kosuke KONDO, Yasuaki AOKI [View]
[Download]

Abstract: This paper proposes a novel capacitor current reduction method in Dual Three-Phase PMSM Drive System. By using Model Predictive Control considering the dead time on the premise of implementation, the method modifies the three-phase voltage command generated by the PI current controller for the current reduction. The effectiveness is verified by simulation and experiment.

   Composition of the Countervoltage for Power-Hardware-in-the-Loop Emulators for Three-Phase Machines
By André HASPEL, Vasken KETCHEDJIAN, Philipp MARX, Mattea ECKSTEIN, Jörg ROTH-STIELOW [View]
[Download]

Abstract: To emulate the reaction of an electrical machine interacting with a device-under-test inverter, apower-hardware-in-the-loop emulator has to provide a suitable countervoltage per phase. For the correct emulation of the dynamic electrical behavior of the machine, especially the current ripple, the countervoltage has to include a steady oscillating component and a stepwise changing component. This paper introduces a novel approach to determine the analytically ideal shape of the countervoltage for the emulation of three-phase machines and provides a simulative validation. As example, a synchronous machine operated with a two-level voltage source inverter is regarded. It is shown that the relation between the machine's direct and quadrature inductances as well as the coupling between the device-under-test inverter and the emulator have a significant influence on the shape of the countervoltage.

   Control of a 9-Phase PMSM with Stacked Polyphase Bridge Converter including DC Source Impedance
By Thilo BRINGEZU, Jürgen BIELA [View]
[Download]

Abstract: This paper presents a control concept for a drive system consisting of a 9-phase PMSM connected to a stacked polyphase bridge converter (SPBC) under consideration of the DC source impedance (Rb, Lb). When the converter is connected to the DC source with a cable, the cable impedance represents a source impedance that could cause instabilities affecting the total DC link voltage and the module voltage balance. In this paper, a control concept is presented for stabilising the module voltage balance via an appropriate definition of the module reference voltage. The total DC link voltage is not controlled but stability is ensured by sufficiently large DC link capacitors. The complete drive controller concept is validated in a simulation of a 1.5kW drive system.

   Convex-Optimization-Based Linear Controllers for Speed Control of Electrical Drives with Low Feedback Accuracy
By Yiwei TANG, Xin SUN, Xudong SUN, Xi XIAO, Meng ZHANG [View]
[Download]

Abstract: This paper proposes a linear controller design method based on convex optimization to optimally balance disturbance rejection and noise suppression in electric drives. The simulation results demonstrate that, compared to conventional linear controllers, the designed controller enhances disturbance rejection without compromising noise suppression, and vice versa.

   Design and Comparative Analysis of Discrete-Time Current Control Algorithms for Permanent Magnet Synchronous Machines
By Tobias SCHILLINGER, Tobias ZAICZEK, Thomas SCHUHMANN, Matthias FRANKE [View]
[Download]

Abstract: PMSM drives are favorable for applications with high demands on the dynamic behavior due to their advantageous torque density. To make optimal use of the PM material, a highly dynamic control of the stator currents is decisive. Therefore different discre-tetime current control algorithms for PMSM drives have been developed, including current state-space and current vector controllers. Nevertheless, classical discrete-time PI controllers with decoupling networks are still frequently applied for control of industrial and electric vehicle drives due to their simple design and high robustness against parameter deviations. In this paper, three different methods for discrete-time current control of a PMSM are compared and tested practically (PI controller, current vector controller and current state-space controller). All controllers performed satisfactorily and robustly against parameter deviations, though their dynamic performance did not meet theoretical expectations. Hence, in the paper a modified discrete-time model for PMSM with pulsewidth modulated stator voltages and symmetrical current sensing is introduced. This model leads to the derivation of a new current vector controller with 'true' deadbeat behaviour, which almost meets the theoretically expected control performance.

   Extraction of Flux Angle using Intermodulation Saliency for Encoderless Torque Control of Induction Motors
By Eduardo RODRIGUEZ MONTERO, Markus VOGELSBERGER, Thomas WOLBANK [View]
[Download]

Abstract: Standard industrial induction motors often exhibit a spatial saliency caused by the relative motion between rotor and stator slots. In combination with the magnetic saturation saliency, an intermodulation saliency arises. This paper presents a novel flux angle estimation method based on the intermodulation saliency, which shows improved dynamic encoderless operation.

   Identification of rotor and stator flux linkage maps of squirrel cage induction motors based on identification of rotor time constant maps
By Johannes STOSS, Akif KARAYEL, Leonard GEIER, Andreas LISKE, Marc HILLER [View]
[Download]

Abstract: Model-predictive, field-oriented control of squirrel cage induction motors (SCIM) depends on the accurate identification and orientation of rotor and stator flux maps. In this paper, a new method is presented that utilizes the measured rotor time constant maps to reduce the orientation error of the identified flux maps. This enables the identification and modelling of the nonlinear and transient machine behavior, due to the estimation of the stator- and rotor-flux maps in dependence of stator and rotor currents. Model-predictive, field-oriented control of squirrel cage induction motors (SCIM) depends on the accurate identification and orientation of rotor and stator flux maps. In this paper, a new method is presented that utilizes the measured rotor time constant maps to reduce the orientation error of the identified flux maps. This enables the identification and modelling of the nonlinear and transient machine behavior, due to the estimation of the stator- and rotor-flux maps in dependence of stator and rotor currents.

   Modeling of Novel Dual Three Phase PMSM with Pseudo-Triple Winding Structure and its Current Vector Control
By Kohei AIBA, Shinji DOKI, Hidenori KATO, Koji ISOGAI [View]
[Download]

Abstract: In this paper, we propose the control model for a novel dual three-phase PMSM with pseudo-triple winding structure(DTP-PMSM with PTWS) which is one of the new multiple stator winding machines. The proposed control model is represented as the extended form of the conventional dual three-phase winding machine, and the validity is demonstrated by being compared with magnetic field analysis results. Furthermore, the current vector controller for the control model is designed and its performance is confirmed by simulation.

   Modulation method to reduce DC-bus harmonics current in two-motor drive system
By Teruya SATO, Hitoshi HAGA [View]
[Download]

Abstract: This study proposes a modulation method to reduce high-frequency components in the DC-buscurrent for a two-motor drive system. The proposed method reduces the current flowingthrough the DC bus capacitor by adjusting the input current ripple of each inverter. Aneffectiveness of the proposed method is confirmed through experiments using actualequipment by reducing the RMS value of the capacitor current by 43.6 \%.

   On the Sensorless PMSM Rotor Position Estimation Enhancement: Application of ADALINE-PLL
By Amirhossein MALEKIPOUR, Adrien CORNE, Lauric GARBUIO, Pierre GRANJON, Laurent GERBAUD [View]
[Download]

Abstract: Considering the sensorless control of PMSMdrives, a novel observer for improving the estimationperfomance is proposed in this paper. An Adaptive linearneuron (ADALINE)-based feed-forward harmonic compensationblock is integrated into the classic PLL, whichtogether form an ADALINE-PLL. Firstly, given a generalinput, the estimation error of a classic PLL is analyticallyinvestigated. It is shown that the estimation error containsseveral distinctive harmonics, which are related to thePLL non-linear structure and input harmonics. Theseharmonics are able to pass through the loop-filter andappear in the estimated phase and frequency as extraripple. In light of the estimation error harmonics, theADALINE-PLL is used for suppression of undesired harmonics.Secondly, the superior perfomance of ADALINEPLL,compared to PLL, is verified through simulationsin several different conditions. In case of acoustic noisebasedor EMF-based PMSM sensorless control, the observerinput signals contain several harmonics, which caneasily distort the estimation performance if not properlyrepressed. As the result, the positive impact of ADALINEPLLon the estimation performance is studied in details.

   Optimized Pulse Patterns for Synchronous Machines with Non-Sinusoidal Back-EMF
By Eleftherios KONTODINAS, Petros KARAMANAKOS, Andreas KRAEMER, Sebastian WENDEL [View]
[Download]

Abstract: Permanent magnet synchronous machines (PMSMs) used in automotive applications typically have a small number of stator slots. This distorts the air-gap flux distribution, thus resulting in a non-sinusoidal back-electromotive force (back-EMF), which in turn deteriorates the drive performance and decreases its efficiency. To address this, this paper proposes optimized pulse patterns (OPPs) that account for the back-EMF harmonics. In doing so, the computed OPPs can significantly improve the drive performance in terms of current and torque distortions. The presented numerical results verify the effectiveness of the proposed modulation method.

   Parallelization of High Efficiency Sine-out Drives for Motor Drive Applications
By Nicklas CHRISTENSEN, Radu LAZAR [View]
[Download]

Abstract: Developing a new family of high efficiency sine-out drives, requires the development of many products to cover an entire business portfolio. However, in theory the sine-out converters should be easy to parallel, which until now has been unexplored. In this paper we will demonstrate output parallelization of high efficiency sine-out drives.

   Performance Evaluation of Position Sensorless Control System with Initial Speed Estimator for Overall Speed Startup
By Rongjiao HAO, Shinji DOKI, Kazuki ASAHINA, Akira IDE [View]
[Download]

Abstract: Position sensorless control for Permanent-magnet synchronous motors has been investigated in numerous studies, but the issues of flying start at high speed are still a major problem. In our previous research, the issues on conventional position control are presented, and the reasons for these issues are distinguished as the initial response of the speed estimation. Based on this discussion, an initial speed estimation method is proposed as a solution. In this paper, the whole position sensorless control system with the initial speed estimation is presented, which enables the startup from overall speed, and the evaluation experiments are reported.

   Secondary-Side Power Control Method of Power Superposition Using a Single-Phase Transformer for Power Supply of Position Sensor in Permanent Magnet Synchronous Motor
By Takeshi KIRIBUCHI, Yukinori INOUE, Shigeo MORIMOTO [View]
[Download]

Abstract: This paper proposes a method for extracting and supplying power to the outside using a transformer in the power line of a permanent magnet synchronous motor (PMSM). The proposed method extracts power from the secondary side of the transformer over the speed-torque characteristic area of the PMSM. The method is validated using simulation.

   Sensitivity Analysis of Model-Based Sensorless Control of Electrically Excited Synchronous Machines Considering Nonlinear Flux Linkages
By Yuebin PANG, Jovan KNEZEVIC, Daniel GLOSE, Christoph HACKL [View]
[Download]

Abstract: Recent active flux linkage model-based observers for sensorless control consider differential inductances in observer design, which improves the estimation performance. However, due to these additional observer parameters, new sensitivities are introduced. To study these effects, a sensitivity analysis is performed and a general function is proposed to calculate the theoretical angular error for any operating point and parameter mismatch. The impact of any parameter mismatch can be analysed by evaluating the derivative of this function.

   Simulation Analysis of the 5-Leg Inverter for a Fault-Tolerant Dual-Motor Drive System
By Mustapha AL SAKKA, Thomas GEURY, Mohamed EL BAGHDADI, Miguel DHAENS, Monzer AL SAKKA, Omar HEGAZY [View]
[Download]

Abstract: This paper presents a compact, cost-effective, and reliable fault tolerant dual-motor drive solution utilising the 5-leg inverter topology. A simple PI-based field weakening control scheme allowing simultaneous and correlated control of both motors is proposed. This enhances the voltage limitations of the 5-leg inverter and extends the speed range of the motors. Additionally, A system-level short-circuit detection method and a fault localisation algorithm are proposed. These methods reduce the size and complexity of the drive and improve its reliability. The system is modelled using physical system models in Simulink/Simscape. Different scenarios are analysed verifying the performance of the field weakening control and the effectiveness of the fault-tolerant control. Preliminary experimental results are included validating the proposed ideas.

   Using the Flux Increment over a Pulse-Width Modulation Period for Anisotropy-based Self-Sensing Control
By Niklas HIMKER, Axel MERTENS [View]
[Download]

Abstract: In this paper, a new residual for anisotropybased self-sensing control (SSC) using numerical ptimisation is presented. The residual is derived with an oversampled current measurement, resulting in a higher signal-to-noise ratio than a regular sampled current measurement. The sought residualprovides a stable position estimate at each operating point of the permanent magnet synchronous machine (PMSM), while taking advantage of the position estimation via the quasi-direct (QD) calculation. The advantages of the QD calculation are the analytical parameterisability of the position estimation and of the speed control.

EPE 2023 - DS3j: Design, Optimisation and Control of Electric Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 05: Renewable Energy Power Systems > EPE 2023 - DS3j: Design, Optimisation and Control of Electric Drives
	[return to parent folder]

	A Development of Short-Time Initial Rotor Position Estimation Technique Based on the Magnetic Saturation and Saliency By Hiroaki SATO, Shigehisa AOYAGI, Hirokazu MATSUI, Shun TANIGUCHI, Shunsuke OHARA	[View] [Download]
Abstract: This paper proposes initial rotor position estimation technique in three-phase permanent magnet synchronous motors (PMSMs) based on the magnetic saturation and saliency. Proposal technique extracts phase current dynamics caused by magnetic saturation and saliency respectively and simultaneously. Furthermore, this method has robustness against rotor position dependencies of d- and q-axis inductance. Therefore, this technique estimates initial rotor position accurately and shortly.

	Adaptive Control as a Hierarchical System By Hussein ABUBAKR, Abderezak LASHAB, Saeed GOLESTAN, Abdullah M. ABUSORRAH, Muhyaddin J. H. RAWA, Mohammad YAQOOB, Juan C. VASQUEZ, Josep M. GUERRERO	[View] [Download]
Abstract: An adaptive control system is a system that can cope with variations in a plant where it plays a major role in smart controllers needed for sophisticated systems. In this study, the adaptive control system is represented as a hierarchical control structure consisting of primary, secondary, and supervisory levels to monitor the system performance and adjust controller parameters for system regulation and stability. To validate the adaptive control concept, a basic automatic voltage regulator model is employed as an example. System performance is assessed against the conventional feedback control system under different step perturbations. The results demonstrate the effectiveness of the proposed adaptation mechanism, acting as a secondary control loop, in achieving superior performance and stability compared to the conventional one.

	An Optimizing Method of Complex PI Controller for Permanent Magnet Synchronous Motor in Magnetic Saturation By Chengyong LIN, Wenxi YAO, Zhihao SONG	[View] [Download]
Abstract: This paper analyses the stability margin of permanent magnet synchronous motor (PMSM)control system that uses a complex PI controller, specifically under high current conditions. Underhigh current conditions, the inductance of the motor sharply decreases. And if the bandwidth ofthe current controller is set high enough, stability issues arise. This paper examines the reasons forchanges in system stability and proposes a parameter design method to enhance stability.

	Capacitor Current Reduction in Dual Three-Phase PMSM Drive System by Model Predictive Control Considering Dead Time By Ryosuke SAKAUCHI, Shinji DOKI, Koji IMAI, Kosuke KONDO, Yasuaki AOKI	[View] [Download]
Abstract: This paper proposes a novel capacitor current reduction method in Dual Three-Phase PMSM Drive System. By using Model Predictive Control considering the dead time on the premise of implementation, the method modifies the three-phase voltage command generated by the PI current controller for the current reduction. The effectiveness is verified by simulation and experiment.

	Composition of the Countervoltage for Power-Hardware-in-the-Loop Emulators for Three-Phase Machines By André HASPEL, Vasken KETCHEDJIAN, Philipp MARX, Mattea ECKSTEIN, Jörg ROTH-STIELOW	[View] [Download]
Abstract: To emulate the reaction of an electrical machine interacting with a device-under-test inverter, apower-hardware-in-the-loop emulator has to provide a suitable countervoltage per phase. For the correct emulation of the dynamic electrical behavior of the machine, especially the current ripple, the countervoltage has to include a steady oscillating component and a stepwise changing component. This paper introduces a novel approach to determine the analytically ideal shape of the countervoltage for the emulation of three-phase machines and provides a simulative validation. As example, a synchronous machine operated with a two-level voltage source inverter is regarded. It is shown that the relation between the machine's direct and quadrature inductances as well as the coupling between the device-under-test inverter and the emulator have a significant influence on the shape of the countervoltage.

	Control of a 9-Phase PMSM with Stacked Polyphase Bridge Converter including DC Source Impedance By Thilo BRINGEZU, Jürgen BIELA	[View] [Download]
Abstract: This paper presents a control concept for a drive system consisting of a 9-phase PMSM connected to a stacked polyphase bridge converter (SPBC) under consideration of the DC source impedance (Rb, Lb). When the converter is connected to the DC source with a cable, the cable impedance represents a source impedance that could cause instabilities affecting the total DC link voltage and the module voltage balance. In this paper, a control concept is presented for stabilising the module voltage balance via an appropriate definition of the module reference voltage. The total DC link voltage is not controlled but stability is ensured by sufficiently large DC link capacitors. The complete drive controller concept is validated in a simulation of a 1.5kW drive system.

	Convex-Optimization-Based Linear Controllers for Speed Control of Electrical Drives with Low Feedback Accuracy By Yiwei TANG, Xin SUN, Xudong SUN, Xi XIAO, Meng ZHANG	[View] [Download]
Abstract: This paper proposes a linear controller design method based on convex optimization to optimally balance disturbance rejection and noise suppression in electric drives. The simulation results demonstrate that, compared to conventional linear controllers, the designed controller enhances disturbance rejection without compromising noise suppression, and vice versa.

	Design and Comparative Analysis of Discrete-Time Current Control Algorithms for Permanent Magnet Synchronous Machines By Tobias SCHILLINGER, Tobias ZAICZEK, Thomas SCHUHMANN, Matthias FRANKE	[View] [Download]
Abstract: PMSM drives are favorable for applications with high demands on the dynamic behavior due to their advantageous torque density. To make optimal use of the PM material, a highly dynamic control of the stator currents is decisive. Therefore different discre-tetime current control algorithms for PMSM drives have been developed, including current state-space and current vector controllers. Nevertheless, classical discrete-time PI controllers with decoupling networks are still frequently applied for control of industrial and electric vehicle drives due to their simple design and high robustness against parameter deviations. In this paper, three different methods for discrete-time current control of a PMSM are compared and tested practically (PI controller, current vector controller and current state-space controller). All controllers performed satisfactorily and robustly against parameter deviations, though their dynamic performance did not meet theoretical expectations. Hence, in the paper a modified discrete-time model for PMSM with pulsewidth modulated stator voltages and symmetrical current sensing is introduced. This model leads to the derivation of a new current vector controller with 'true' deadbeat behaviour, which almost meets the theoretically expected control performance.

	Extraction of Flux Angle using Intermodulation Saliency for Encoderless Torque Control of Induction Motors By Eduardo RODRIGUEZ MONTERO, Markus VOGELSBERGER, Thomas WOLBANK	[View] [Download]
Abstract: Standard industrial induction motors often exhibit a spatial saliency caused by the relative motion between rotor and stator slots. In combination with the magnetic saturation saliency, an intermodulation saliency arises. This paper presents a novel flux angle estimation method based on the intermodulation saliency, which shows improved dynamic encoderless operation.

	Identification of rotor and stator flux linkage maps of squirrel cage induction motors based on identification of rotor time constant maps By Johannes STOSS, Akif KARAYEL, Leonard GEIER, Andreas LISKE, Marc HILLER	[View] [Download]
Abstract: Model-predictive, field-oriented control of squirrel cage induction motors (SCIM) depends on the accurate identification and orientation of rotor and stator flux maps. In this paper, a new method is presented that utilizes the measured rotor time constant maps to reduce the orientation error of the identified flux maps. This enables the identification and modelling of the nonlinear and transient machine behavior, due to the estimation of the stator- and rotor-flux maps in dependence of stator and rotor currents. Model-predictive, field-oriented control of squirrel cage induction motors (SCIM) depends on the accurate identification and orientation of rotor and stator flux maps. In this paper, a new method is presented that utilizes the measured rotor time constant maps to reduce the orientation error of the identified flux maps. This enables the identification and modelling of the nonlinear and transient machine behavior, due to the estimation of the stator- and rotor-flux maps in dependence of stator and rotor currents.

	Modeling of Novel Dual Three Phase PMSM with Pseudo-Triple Winding Structure and its Current Vector Control By Kohei AIBA, Shinji DOKI, Hidenori KATO, Koji ISOGAI	[View] [Download]
Abstract: In this paper, we propose the control model for a novel dual three-phase PMSM with pseudo-triple winding structure(DTP-PMSM with PTWS) which is one of the new multiple stator winding machines. The proposed control model is represented as the extended form of the conventional dual three-phase winding machine, and the validity is demonstrated by being compared with magnetic field analysis results. Furthermore, the current vector controller for the control model is designed and its performance is confirmed by simulation.

	Modulation method to reduce DC-bus harmonics current in two-motor drive system By Teruya SATO, Hitoshi HAGA	[View] [Download]
Abstract: This study proposes a modulation method to reduce high-frequency components in the DC-buscurrent for a two-motor drive system. The proposed method reduces the current flowingthrough the DC bus capacitor by adjusting the input current ripple of each inverter. Aneffectiveness of the proposed method is confirmed through experiments using actualequipment by reducing the RMS value of the capacitor current by 43.6 \%.

	On the Sensorless PMSM Rotor Position Estimation Enhancement: Application of ADALINE-PLL By Amirhossein MALEKIPOUR, Adrien CORNE, Lauric GARBUIO, Pierre GRANJON, Laurent GERBAUD	[View] [Download]
Abstract: Considering the sensorless control of PMSMdrives, a novel observer for improving the estimationperfomance is proposed in this paper. An Adaptive linearneuron (ADALINE)-based feed-forward harmonic compensationblock is integrated into the classic PLL, whichtogether form an ADALINE-PLL. Firstly, given a generalinput, the estimation error of a classic PLL is analyticallyinvestigated. It is shown that the estimation error containsseveral distinctive harmonics, which are related to thePLL non-linear structure and input harmonics. Theseharmonics are able to pass through the loop-filter andappear in the estimated phase and frequency as extraripple. In light of the estimation error harmonics, theADALINE-PLL is used for suppression of undesired harmonics.Secondly, the superior perfomance of ADALINEPLL,compared to PLL, is verified through simulationsin several different conditions. In case of acoustic noisebasedor EMF-based PMSM sensorless control, the observerinput signals contain several harmonics, which caneasily distort the estimation performance if not properlyrepressed. As the result, the positive impact of ADALINEPLLon the estimation performance is studied in details.

	Optimized Pulse Patterns for Synchronous Machines with Non-Sinusoidal Back-EMF By Eleftherios KONTODINAS, Petros KARAMANAKOS, Andreas KRAEMER, Sebastian WENDEL	[View] [Download]
Abstract: Permanent magnet synchronous machines (PMSMs) used in automotive applications typically have a small number of stator slots. This distorts the air-gap flux distribution, thus resulting in a non-sinusoidal back-electromotive force (back-EMF), which in turn deteriorates the drive performance and decreases its efficiency. To address this, this paper proposes optimized pulse patterns (OPPs) that account for the back-EMF harmonics. In doing so, the computed OPPs can significantly improve the drive performance in terms of current and torque distortions. The presented numerical results verify the effectiveness of the proposed modulation method.

	Parallelization of High Efficiency Sine-out Drives for Motor Drive Applications By Nicklas CHRISTENSEN, Radu LAZAR	[View] [Download]
Abstract: Developing a new family of high efficiency sine-out drives, requires the development of many products to cover an entire business portfolio. However, in theory the sine-out converters should be easy to parallel, which until now has been unexplored. In this paper we will demonstrate output parallelization of high efficiency sine-out drives.

	Performance Evaluation of Position Sensorless Control System with Initial Speed Estimator for Overall Speed Startup By Rongjiao HAO, Shinji DOKI, Kazuki ASAHINA, Akira IDE	[View] [Download]
Abstract: Position sensorless control for Permanent-magnet synchronous motors has been investigated in numerous studies, but the issues of flying start at high speed are still a major problem. In our previous research, the issues on conventional position control are presented, and the reasons for these issues are distinguished as the initial response of the speed estimation. Based on this discussion, an initial speed estimation method is proposed as a solution. In this paper, the whole position sensorless control system with the initial speed estimation is presented, which enables the startup from overall speed, and the evaluation experiments are reported.

	Secondary-Side Power Control Method of Power Superposition Using a Single-Phase Transformer for Power Supply of Position Sensor in Permanent Magnet Synchronous Motor By Takeshi KIRIBUCHI, Yukinori INOUE, Shigeo MORIMOTO	[View] [Download]
Abstract: This paper proposes a method for extracting and supplying power to the outside using a transformer in the power line of a permanent magnet synchronous motor (PMSM). The proposed method extracts power from the secondary side of the transformer over the speed-torque characteristic area of the PMSM. The method is validated using simulation.

	Sensitivity Analysis of Model-Based Sensorless Control of Electrically Excited Synchronous Machines Considering Nonlinear Flux Linkages By Yuebin PANG, Jovan KNEZEVIC, Daniel GLOSE, Christoph HACKL	[View] [Download]
Abstract: Recent active flux linkage model-based observers for sensorless control consider differential inductances in observer design, which improves the estimation performance. However, due to these additional observer parameters, new sensitivities are introduced. To study these effects, a sensitivity analysis is performed and a general function is proposed to calculate the theoretical angular error for any operating point and parameter mismatch. The impact of any parameter mismatch can be analysed by evaluating the derivative of this function.

	Simulation Analysis of the 5-Leg Inverter for a Fault-Tolerant Dual-Motor Drive System By Mustapha AL SAKKA, Thomas GEURY, Mohamed EL BAGHDADI, Miguel DHAENS, Monzer AL SAKKA, Omar HEGAZY	[View] [Download]
Abstract: This paper presents a compact, cost-effective, and reliable fault tolerant dual-motor drive solution utilising the 5-leg inverter topology. A simple PI-based field weakening control scheme allowing simultaneous and correlated control of both motors is proposed. This enhances the voltage limitations of the 5-leg inverter and extends the speed range of the motors. Additionally, A system-level short-circuit detection method and a fault localisation algorithm are proposed. These methods reduce the size and complexity of the drive and improve its reliability. The system is modelled using physical system models in Simulink/Simscape. Different scenarios are analysed verifying the performance of the field weakening control and the effectiveness of the fault-tolerant control. Preliminary experimental results are included validating the proposed ideas.

	Using the Flux Increment over a Pulse-Width Modulation Period for Anisotropy-based Self-Sensing Control By Niklas HIMKER, Axel MERTENS	[View] [Download]
Abstract: In this paper, a new residual for anisotropybased self-sensing control (SSC) using numerical ptimisation is presented. The residual is derived with an oversampled current measurement, resulting in a higher signal-to-noise ratio than a regular sampled current measurement. The sought residualprovides a stable position estimate at each operating point of the permanent magnet synchronous machine (PMSM), while taking advantage of the position estimation via the quasi-direct (QD) calculation. The advantages of the QD calculation are the analytical parameterisability of the position estimation and of the speed control.