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一种使用重叠换相法的无刷直流电机平均转矩控制

DOI: 10.13334/j.0258-8013.pcsee.2015.15.024, PP. 3939-3947

Keywords: 无刷直流电机,非理想反电势,重叠换相,平均转矩,转矩脉动

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Abstract:

提出一种使用重叠换相的平均转矩控制,这种方法可以同时抑制无刷直流电机由反电势畸变和换相引起的转矩脉动。平均转矩控制将每个开关周期内的平均转矩作为控制变量,在每个开关周期内使其等于给定量,因此可以抑制由反电势畸变引起的转矩脉动。而对于换相转矩脉动,该方法结合重叠换相法,对高速时的转矩跌落进行补偿,其中重叠角度通过检测关断相电流的过零点来实现。文中提出的控制方法能够适用不同反电势的无刷直流电机,具有通用性强,控制简单的特点。仿真和实验都验证了这种方法可以有效抑制无刷直流电机由反电势畸变和换相引起的转矩脉动。

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