A low torque ripple control scheme of asynchronous traction motor with continuous stator-flux linkage locus
Tien Van Pham1,Trillion Q. Zheng1,Yang Zhongping1,Fei Lin1,Song Wensheng2,Dung Viet Do3
1. School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China; 2. School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China; 3. Department of Mechanical Engineering University of Transport and Communications Hanoi Vietnam
Abstract A direct torque control(DTC) of asynchronous traction motor with the optimal stator flux-linkage locus is proposed to apply in medium and high speed ranges. In order to reduce torque ripple, the stator flux-linkage track of the proposed DTC can be switched continually from roundness to polygon to hexagon with the increase of rotor speed; hence, it can obtain smoothly stator flux, high utilization switching frequency and good harmonic elimination ability. The proposed DTC method can be realized by adding stator flux-linkage regulation in traditional DTC control structure, whose advantages are its simplification, and retention of traditional DTC’s features such as fast dynamic response, simple control structure, and low dependence on motor parameters. Theory analysis and experimental results both demonstrate the effectiveness and feasibility of the proposed DTC method with continuous flux-linkage locus.
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2015, Vol. 30 
