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Energies 2018, 11(9), 2189; https://doi.org/10.3390/en11092189

Comparative Evaluation of a Permanent Magnet Machine Saliency-Based Drive with Sine-Wave and Square-Wave Voltage Injection

1
Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
2
Hua-Chuang Automobile Information Technical Center, Zhongxing Road, New Taipei 231, Taiwan
*
Author to whom correspondence should be addressed.
Received: 11 July 2018 / Revised: 30 July 2018 / Accepted: 18 August 2018 / Published: 21 August 2018
(This article belongs to the Special Issue Power Electronics for Energy Storage)
Full-Text   |   PDF [4865 KB, uploaded 21 August 2018]   |  

Abstract

This paper improves a permanent magnet (PM) machine saliency-based drive performance based on the selection of a suitable injection signal. For the saliency-based position estimation, a persistently high-frequency (HF) voltage signal is injected to obtain a measurable spatial saliency feedback signal. The injection signal can be sine-wave or square-wave alternating current (AC) voltage manipulated by the inverter’s pulse width modulation (PWM). Due to the PWM dead-time effect, these HF voltage injection signals might be distorted, leading to secondary harmonics on the saliency signal. In addition, the flux saturation in machine rotors also results in other saliency harmonics. These nonlinear attributes cause position estimation errors on saliency-based drives. In this paper, two different voltage signals are analyzed to find a suited voltage which is less sensitive to these nonlinear attributes. Considering the inverter dead-time, a sine-wave voltage signal reduces its influence on the saliency signal. By contrast, the flux saturation causes the same amount of error on two injection signals. Analytical equations are developed to investigate position errors caused by the dead-time and flux saturation. An interior PM machine with the saliency ratio of 1.41 is tested for the experimental verification. View Full-Text
Keywords: permanent magnet machine; encoderless machine drive; high-frequency voltage injection and self-sensing machine permanent magnet machine; encoderless machine drive; high-frequency voltage injection and self-sensing machine
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Chen, J.-Y.; Yang, S.-C.; Tu, K.-H. Comparative Evaluation of a Permanent Magnet Machine Saliency-Based Drive with Sine-Wave and Square-Wave Voltage Injection. Energies 2018, 11, 2189.

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