永磁同步电机转子初始位置检测方法

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Abstract An estimation method for the initial rotor position for permanent magnet (PM) synchronous motor based on the high frequency voltage injection is presented on account of the problems in existing methods,which includes that the rotor may jitter,the methods depend highly on the motor parameters,and the mathematical processing algorithm of the high-frequency current responses during the estimation is complex.In the proposed method,the three phase high frequency voltage signals are laid on the motor first.By comparing the amplitudes of the three-phase high frequency current responses through LPF (low-pass filter),the method obtains the initial rotor position following the rules that the rotor position affects the amplitudes of the three-phase high frequency current responses.Then the motor magnetic saturation effect is used to distinguish the NS poles.The algorithms and the experimental results show that the proposed estimation method for the initial rotor position is correct.And during the estimation,the rotor does not jitter.The method does not need any additional circuits.The mathematical processing algorithm for the high-frequency current response is easy.And the estimation error is small.This estimation method can be used in motor’s smooth start.

Key words： Permanent magnet synchronous motor initial rotor position high frequency signal injection magnetic saturation effect

Received: 20 November 2014 Published: 25 May 2015

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TM315

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	Lu Jiadong
	Liu Jinglin
	Wei Lichao

Cite this article:

Lu Jiadong,Liu Jinglin,Wei Lichao. Estimation of the Initial Rotor Position for Permanent Magnet Synchronous Motors[J]. Transactions of China Electrotechnical Society, 2015, 30(7): 105-111.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I7/105

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