EPE Association: EPE-PEMC 2008 - Topic: Sensorless Control of Permanent Magnet Synchronous Motors at Low Speed And Standstill

EPE-PEMC 2008 - Topic: Sensorless Control of Permanent Magnet Synchronous Motors at Low Speed And Standstill
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Sensorless Control of Permanent Magnet Synchronous Motors at Low Speed And Standstill

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   Control of Axial Flux Permanent Magnet Motor by the PIPCRM Method at Standstill and at Low Speed
By Janusz Wisniewski [View]
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Abstract: The paper presents novel sensorless method of rotor position detection without any mechanical sensor. Described method bases on inductance variations connected with poles position. The rotor position is obtained by applying one voltage pulse only. Efficiency of presented method has been confirmed by laboratory tests on Axial Flux Permanent Magnet Motor. Moreover described method can be used to startup the permanent magnet motor from standstill in certain direction.

   Drift and Parameter Compensated Flux, Estimator for PMSM with Assistance of Alternating Carrier HF Injection - Encoderless Control in Whole Speed Range
By Stefan Gottfried and Ralph Kennel

Abstract: A hybrid position observer for PMSM is proposed where emf and saliency are evaluated simultaneously at low speed. Transition to high speed requires no parameter change nor phase over process. The circular rotor flux trajectory is estimated by a pure integrator. Drift in radial direction is compensated by feedback control of rotor flux magnitude. At low speed Alternating High Frequency voltage Injection (HFI) assists the integrator by providing tangential feedback. Online tracking of stator resistance improves performance. Implementation on a DSP system shows practical feasibility and highly dynamic position tracking from zero speed to field weakening range.

   Sensorless Control of PM Synchronous Motors Using a Predictive Current Controller with Integrated INFORM and EMF Evaluation
By Manfred Schrödl and Christian Simetzberger [View]
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Abstract: The paper describes a new current control algorithm with integrated measuring algorithms used for sensorless control of permanent magnet (PMSM-) synchronous motor drives. The measuring information is evaluated to detect the rotor position at low speed range using the INFORM method and at high speed range using an EMF-based model. No extra test pulses are necessary for sensorless position detection. A further advantage of the current controller with ingrated INFORM/EMF measurement is that only few parameters are necessary for control.

   Sensorless Direct Torque and Flux Control of an IPM Synchronous Motor at Low Speed and Standstill
By Gilbert Foo, S. Sayeef and M. F. Rahman [View]
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Abstract: This paper investigates a sensorless direct torque and flux control (DTFC) scheme for IPM synchronous motor (IPMSM) drives at low speed and standstill. Closedloop control of both the torque and stator flux linkage are achieved using two proportional-integral (PI) controllers. A high frequency signal injection technique is utilized at low speeds to obtain the rotor position information. The hybrid current-voltage model flux observer with a smooth handover algorithm estimates the stator flux linkage over the whole speed range. The sensorless method is capable of zero-speed full load operation. Experimental results confirm the effectiveness of the proposed sensorless SVM-DTFC system.

   Zero Speed Position Estimation of a Matrix Converter Fed AC PM Machine using PWM Excitation
By Q. Gao, G. M. Asher and M. Sumner [View]
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Abstract: This paper describes a sensorless position estimation method of a permanent magnet motor fed from a three-phase matrix converter using only its space vector PWM (SVPWM) sequence. The scheme employs measurements of the di/dt of the motor line currents to construct orthogonal "resolver like" position signals. In principle, the SVPWM waveforms provide sufficient excitation to extract the position signal from the motor current. However, in order to improve the signal-to-noise ratio of the di/dt signals, a small modification to the SVPWM is required. Sensorless control of the permanent magnet synchronous motor at low and zero speed is demonstrated experimentally. The small input voltage to the matrix converter is also investigated to reduce the current ripple.

EPE-PEMC 2008 - Topic: Sensorless Control of Permanent Magnet Synchronous Motors at Low Speed And Standstill
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Sensorless Control of Permanent Magnet Synchronous Motors at Low Speed And Standstill
	[return to parent folder]

	Control of Axial Flux Permanent Magnet Motor by the PIPCRM Method at Standstill and at Low Speed By Janusz Wisniewski	[View] [Download]
Abstract: The paper presents novel sensorless method of rotor position detection without any mechanical sensor. Described method bases on inductance variations connected with poles position. The rotor position is obtained by applying one voltage pulse only. Efficiency of presented method has been confirmed by laboratory tests on Axial Flux Permanent Magnet Motor. Moreover described method can be used to startup the permanent magnet motor from standstill in certain direction.

	Drift and Parameter Compensated Flux, Estimator for PMSM with Assistance of Alternating Carrier HF Injection - Encoderless Control in Whole Speed Range By Stefan Gottfried and Ralph Kennel
Abstract: A hybrid position observer for PMSM is proposed where emf and saliency are evaluated simultaneously at low speed. Transition to high speed requires no parameter change nor phase over process. The circular rotor flux trajectory is estimated by a pure integrator. Drift in radial direction is compensated by feedback control of rotor flux magnitude. At low speed Alternating High Frequency voltage Injection (HFI) assists the integrator by providing tangential feedback. Online tracking of stator resistance improves performance. Implementation on a DSP system shows practical feasibility and highly dynamic position tracking from zero speed to field weakening range.

	Sensorless Control of PM Synchronous Motors Using a Predictive Current Controller with Integrated INFORM and EMF Evaluation By Manfred Schrödl and Christian Simetzberger	[View] [Download]
Abstract: The paper describes a new current control algorithm with integrated measuring algorithms used for sensorless control of permanent magnet (PMSM-) synchronous motor drives. The measuring information is evaluated to detect the rotor position at low speed range using the INFORM method and at high speed range using an EMF-based model. No extra test pulses are necessary for sensorless position detection. A further advantage of the current controller with ingrated INFORM/EMF measurement is that only few parameters are necessary for control.

	Sensorless Direct Torque and Flux Control of an IPM Synchronous Motor at Low Speed and Standstill By Gilbert Foo, S. Sayeef and M. F. Rahman	[View] [Download]
Abstract: This paper investigates a sensorless direct torque and flux control (DTFC) scheme for IPM synchronous motor (IPMSM) drives at low speed and standstill. Closedloop control of both the torque and stator flux linkage are achieved using two proportional-integral (PI) controllers. A high frequency signal injection technique is utilized at low speeds to obtain the rotor position information. The hybrid current-voltage model flux observer with a smooth handover algorithm estimates the stator flux linkage over the whole speed range. The sensorless method is capable of zero-speed full load operation. Experimental results confirm the effectiveness of the proposed sensorless SVM-DTFC system.

	Zero Speed Position Estimation of a Matrix Converter Fed AC PM Machine using PWM Excitation By Q. Gao, G. M. Asher and M. Sumner	[View] [Download]
Abstract: This paper describes a sensorless position estimation method of a permanent magnet motor fed from a three-phase matrix converter using only its space vector PWM (SVPWM) sequence. The scheme employs measurements of the di/dt of the motor line currents to construct orthogonal "resolver like" position signals. In principle, the SVPWM waveforms provide sufficient excitation to extract the position signal from the motor current. However, in order to improve the signal-to-noise ratio of the di/dt signals, a small modification to the SVPWM is required. Sensorless control of the permanent magnet synchronous motor at low and zero speed is demonstrated experimentally. The small input voltage to the matrix converter is also investigated to reduce the current ripple.