一种抑制无刷直流电动机换相转矩脉动的新方法

The New Approach of Reducing Commutation Torque Ripple for Brushless DC Motor

无刷直流电动机具有传统直流电动机的优点,可以低速大功率运行,可以省去减速机直接驱动大的负载,同时体积小、重量轻、出力大。因此,在各行各业得到了广泛的应用。但缺点是转矩脉动较大。在Z源逆变器的基础上,本文提出用一种改进型的Z源逆变器来抑制无刷直流电动机换相转矩脉动,改进型的Z源拓扑相对于传统拓扑减少了一个电容。因此可减小电路的体积及设计成本。该拓扑的升压能力与传统拓扑相当,并且不存在传统拓扑那样的起动回路,不存在起动冲击问题,无需采用软起动策略,起动过程简单。而且能够有效地抑制换相转矩脉动。

The brushless DC motor has the advantages of traditional DC motor which can run for high power at low speed and save reducer direct drive big load. moreover, it has the characteristic of small volume, light weight and large output. So, it has been widely used in all walks of life. However, the disadvantage is that the torque ripple is bigger. Based on the Z-source inverter, this paper proposes a novel commutation torque ripple reduction strategy for brushless DC motor （BLDCM）. Modified Z-source topology compared with the traditional topology reduces one capacitor. It can reduce the volume of circuit and the design cost, boosting capacity and the traditional topology of the topology, and there is no traditional topology of the circuit and no start impact problem, it don＇t need to adopt the strategy of soft start and start the process simple. Furthermore it can effectively inhibit the commutation torque ripple.