Abstract：The flux-weakening control technology could reduce the capacity of the inverter and widen the speed rang, and this are important to improve the performance of the railway traction system of permanent magnet synchronous motor. The flux-weakening control system would be have more excellent output performance because of the excellent performance of modulation , but the traditional space voltage vector modulation could not meet the need of the control strategy because of the lower switch frequency of the inverter. This paper proposes a new permanent magnet synchronous motor flux-weakening strategy based on the principle of the multi-mode space vector pulse width modulation algorithm and the principle of the permanent magnet synchronous motor flux-weakening control theory. Then, the method could ensure that the permanent magnet flux-weakening control of railway traction system can make full use of the switch frequency and have better performance output under asynchronous modulation and subsection synchronous modulation. The simulation and experiment verify the feasibility and effectiveness of this method.
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2012, Vol. 27 
