EPE Association: EPE 2011 - LS4g: Topic 10: Control Optimisation of Permanent Magnet Synchronous Machines

EPE 2011 - LS4g: Topic 10: Control Optimisation of Permanent Magnet Synchronous Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 10: Electrical Machines > EPE 2011 - LS4g: Topic 10: Control Optimisation of Permanent Magnet Synchronous Machines

   [return to parent folder]

   Current Ripple Reduction in Synchronous Machines driven from Multi-Functional Converter Systems
By Thomas HACKNER, Johannes PFORR [View]
[Download]

Abstract: An automotive electric power steering synchronous machine driven from a multi-functional converter has been analyzed and optimized. A multi-functional converter system integrates a front-end boost converter to increase the inverter voltage of an electrical machine. The integration leads to new requirements for the machine due to dc currents and increased high-frequency ripple currents in the motor windings. In this paper the high-frequency ripple currents of a synchronous machine with multi-functional converter is investigated. The paper contains analyses of the high-frequency ripple currents with and without low frequency ac modulation and hence, when operated at high and low rotational speed. An interleaved switching scheme is proposed to reduce the high-frequency ripple currents and is evaluated for the given application. Experimental results are in good correlation with theoretical predictions and demonstrate the reduction of the high-frequency phase and star-point ripple currents if a good coupling between the machine windings is achieved.

   Manufacturing tolerances: Estimation and prediction of cogging torque influenced by magnetization faults
By Isabel COENEN, Michael VAN DER GIET, Kay HAMEYER [View]
[Download]

Abstract: Permanent magnet excited synchronous motor servo drives are increasingly employed in industrial applications. During mass production deviations from the ideal machine occur. Thereby, parasitic effects such as cogging torque and torque ripple are influenced in particular. For permanent magnet excited machines the magnet’s quality is important. There are many possible failure configurations requiring the study of their influence on the machine’s behavior. In this paper, an approach for the estimation of cogging torque considering magnetization faults is presented. This approach is applied to determine crucial configurations of permanent magnet faults. The intent is to evaluate the influence of the faulty magnetic materials with its asymmetries on the later produced machine. In the process, analytical and numerical methods are combined whereby finally a small computational effort with accurate results is achieved.

   Sensorless Control Drive of Permanent Magnet Motor Based on a Simple On-line Parameter Identification Scheme
By Mona MOUSSA, Yasser DESSOUKY [View]
[Download]

Abstract: Interior Permanent Magnet Synchronous Motors (IPMSMs) are receiving increased attention for drive applications. To control IPMSM, position and speed sensors are indispensable because the current should be controlled depending on the rotor position. Several sensorless control schemes have been proposed. However, most of these methods use motor parameters to estimate rotor position, and hence position estimation error is caused by parameters variations. That is why, motor parameters are identified on-line under sensorless control. In this paper, an effective and simple on-line parameter identification scheme is proposed to estimate the armature resistance and the q-axis inductance of IPMSMs. The identification method is developed based on the fact that, in practice both the d-axis inductance and the PM flux-linkage are constants. A sensorless control scheme based on the extended EMF using reduced-order observer and the proposed identification method are presented to maintain position estimation accuracy. Simulation results are included to prove the effectiveness of the overall control system under different operating conditions.

EPE 2011 - LS4g: Topic 10: Control Optimisation of Permanent Magnet Synchronous Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 10: Electrical Machines > EPE 2011 - LS4g: Topic 10: Control Optimisation of Permanent Magnet Synchronous Machines
	[return to parent folder]

	Current Ripple Reduction in Synchronous Machines driven from Multi-Functional Converter Systems By Thomas HACKNER, Johannes PFORR	[View] [Download]
Abstract: An automotive electric power steering synchronous machine driven from a multi-functional converter has been analyzed and optimized. A multi-functional converter system integrates a front-end boost converter to increase the inverter voltage of an electrical machine. The integration leads to new requirements for the machine due to dc currents and increased high-frequency ripple currents in the motor windings. In this paper the high-frequency ripple currents of a synchronous machine with multi-functional converter is investigated. The paper contains analyses of the high-frequency ripple currents with and without low frequency ac modulation and hence, when operated at high and low rotational speed. An interleaved switching scheme is proposed to reduce the high-frequency ripple currents and is evaluated for the given application. Experimental results are in good correlation with theoretical predictions and demonstrate the reduction of the high-frequency phase and star-point ripple currents if a good coupling between the machine windings is achieved.

	Manufacturing tolerances: Estimation and prediction of cogging torque influenced by magnetization faults By Isabel COENEN, Michael VAN DER GIET, Kay HAMEYER	[View] [Download]
Abstract: Permanent magnet excited synchronous motor servo drives are increasingly employed in industrial applications. During mass production deviations from the ideal machine occur. Thereby, parasitic effects such as cogging torque and torque ripple are influenced in particular. For permanent magnet excited machines the magnet’s quality is important. There are many possible failure configurations requiring the study of their influence on the machine’s behavior. In this paper, an approach for the estimation of cogging torque considering magnetization faults is presented. This approach is applied to determine crucial configurations of permanent magnet faults. The intent is to evaluate the influence of the faulty magnetic materials with its asymmetries on the later produced machine. In the process, analytical and numerical methods are combined whereby finally a small computational effort with accurate results is achieved.

	Sensorless Control Drive of Permanent Magnet Motor Based on a Simple On-line Parameter Identification Scheme By Mona MOUSSA, Yasser DESSOUKY	[View] [Download]
Abstract: Interior Permanent Magnet Synchronous Motors (IPMSMs) are receiving increased attention for drive applications. To control IPMSM, position and speed sensors are indispensable because the current should be controlled depending on the rotor position. Several sensorless control schemes have been proposed. However, most of these methods use motor parameters to estimate rotor position, and hence position estimation error is caused by parameters variations. That is why, motor parameters are identified on-line under sensorless control. In this paper, an effective and simple on-line parameter identification scheme is proposed to estimate the armature resistance and the q-axis inductance of IPMSMs. The identification method is developed based on the fact that, in practice both the d-axis inductance and the PM flux-linkage are constants. A sensorless control scheme based on the extended EMF using reduced-order observer and the proposed identification method are presented to maintain position estimation accuracy. Simulation results are included to prove the effectiveness of the overall control system under different operating conditions.