一种改进的无刷直流电机直接转矩控制策略  

Improved Control Strategy for the DTC System of BLDC Motors

作　　者：周运杰[1] 潘峰[1] 卢沁雄[1] 闫庚龙 韩如成[1] ZHOU Yunjie;PAN Feng;LU Qinxiong;YAN Genglong;HAN Rucheng(Electronic Information and Engineering College,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原科技大学电子信息工程学院,山西太原030024

出　　处：《电气传动》2017年第9期8-13,共6页Electric Drive

基　　金：山西省自然科学基金项目(2010011024-3)

摘　　要：通过分析换相和非换相时间段内电机被施加不同零矢量时电磁转矩的变化速率发现:若电机在换相时和换相前被施加的零矢量不同,则电机在换相时间段内被施加零矢量时电磁转矩会迅速减小,在控制周期一定的情况下,电磁转矩减小过快会引起明显的转矩脉动。为此,提出一种在每个扇区使用2个零矢量的方案,使得电机每次换相时和换相前被施加的零矢量相同,从而抑制由于零矢量引起的电磁转矩周期性脉动。仿真结果和实验结果证实了所提出方法的有效性。The changing rate of the electromagnetic torque when the motor is imposed on different null voltage vectors during commutation intervals and non-commutation intervals were analyzed.It was found that the electromagnetic torque will be decreased quickly during commutation intervals when the motor is imposed on zero voltage vectors,ifthe null voltage vectors imposed on the motor are different during and before commutation intervals.So great torqueripples can be created when the system works under certain control cycles.A modified method that chose not one zerovoltage vector but two different zero voltage vectors during one sector was proposed to suppress the torque ripplescreated periodically.The results of the simulation and experiments highlight the validation of the method proposed.

关 键 词：无刷直流电机 直接转矩控制 转矩脉动 零电压矢量 

分 类 号：TM351[电气工程—电机]