时间谐波对永磁同步电机损耗的影响规律

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Abstract In order to study the method to reduce losses induced by time harmonic in permanent magnet motors, time-stepping finite element method is adopted to analyze the additional losses distribution in each part by taking a 4.2kW, 8-pole surface permanent magnet(SPM) motor as an example. Furthermore, the change law of losses is studied under different inverter parameters(including amplitude modulation ratio a and switching frequency f_c), air-gap length(δ), rotor magnetic structure including surface permanent magnet type and interior permanent magnet(IPM) type. Finally, the change law of additional losses under different inverter parameters is verified by the measurements carried out on 3 prototype motors. It is found that additional losses concentrate mostly in permanent magnets, then in stator core, at last in rotor core when fed by inverter. The average reduction of total additional losses is 18.7% with the increasing of f_c at 1kHz when f_c<3kHz, while the decrease is 6.5% when f_c>3kHz. Once a increases 0.1, the average reduction of total additional losses is 18.7%. Otherwise, δ increases 0.1mm, the average reduction of total additional losses is 5.4%. The percentage of additional loss in rotor in IPM type is larger than SPM type, while the loss in permanent magnets is smaller.

Key words： Additional losses time-stepping finite element method air-gap length inverter parameter rotor magnetic structure

Received: 20 October 2014 Published: 10 April 2015

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TM315

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	Tong Wenming
	Zhu Xiaofeng
	Jia Jianguo
	Duan Qingliang

Cite this article:

Tong Wenming,Zhu Xiaofeng,Jia Jianguo等. Influence Law of Additional Losses Induced by Time Harmonic in Permanent Magnet Synchronous Motors[J]. Transactions of China Electrotechnical Society, 2015, 30(6): 60-69.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I6/60

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