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| The Central 60° Synchronous Modulation Based on Permanent Magnet Synchronous Motor Stator Flux Trajectory Control |
| Fang Xiaochun, Yuan Jialiang, Zhao Dong, Lin Fei, Yang Zhongping |
| Beijing Jiaotong University Beijing 100044 China |
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Abstract The traditional central 60° synchronous modulation has poor dynamic performance, because its switching sequence is based on Fourier analysis of the steady-state voltage. Based on basic principles research and simulation, this paper points out the key question of special pulse-width modulation dynamic performance is that stator harmonic currents is consecutive or not. Comparison of existing related solutions, a central 60° synchronous modulation based on PMSM (permanent magnet synchronous motor) stator flux trajectory control is proposed. In this method, the PMSM stator flux is the object for observation and control. Switching sequences of conventional method is modified based on the error value between calculated flux and observed flux. Then, continuity of the current trajectory and the stator flux trajectory is guaranteed, the system dynamic performance will be better. A detailed flow chart of the control signal transmission is given. Calculated and observed method of flux is determined. Based on the definition and formula of key variables, basic rules of the switching sequence amendment are proposed. The method is verified by simulation and experiment.
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Received: 10 September 2014
Published: 29 June 2015
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2015, Vol. 30 
