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针对这个问题，分别采用传统的重叠换相和提出的动态换相技术进行研究。
Classical overlapping commutation and novel dynamic commutation technique were both used to solve this question separated.
同时，着重对电流换相时所引起的转矩脉动进行了研究，发现采用重叠换相技术可减小这种转矩脉动。
At the same time torque pulsation in circuit commutation is analyzed and researched chiefly, and overlapping commutation technology is offered in order to reduce this torque pulsation.
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