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| Torque Ripple and Losses of Direct-Drive Multi-Phase Permanent Magnet Synchronous Machines |
| Fang Cheng1, Xu Haiping1, Xue Shaoshen1, Huang Qinpeng1, 2, Xue Shan1 |
| 1. Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Science Beijing 100190 China; 2.University of Chinese Academy of Sciences Beijing 100049 China |
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Abstract Compared with general three phase machine, the direct-drive multi-phase permanent magnet synchronous machine has the characteristics of more phase number, variety of pole/slot matches and winding configurations, variety of neutral point connections and PWM control modes. These characteristics make the stator current and magnetic field very complex, and the performance has some particularity. So it is necessary to study the main performance of the machine. In this paper, the relations between torque ripple, losses and harmonic magnetic field are analyzed. The finite element analysis model of direct-drive multi-phase permanent magnet synchronous machine is established by the software ANSOFT. The impact of these characteristics on the torque ripple and losses is studied. All studies show that with the increase of the phase number, pole/slot number and reasonable selection of neutral point connection mode the harmonic magnetic field, torque ripple and losses of machine can be reduced effectively.
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Received: 29 January 2013
Published: 05 November 2014
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2014, Vol. 29 
