摘要
研究了一种改进型无刷直流电机脉宽调制策略。在传统的无刷直流电机脉宽调制技术的基础上,针对调制期间开关管断开时的电机绕组电流无法有效控制问题,研究了一种基于六开关电压源型逆变器的四管调制策略,即在任意时刻逆变器都有4个功率开关同时参与调制过程。该方法在脉宽调制过程中,在电机绕组电流导通状态下,在两个开关桥臂上仅仅有两个开关工作;在绕组电流处于续流状态下,在同一个逆变器桥臂上的,有对称的另外两个开关进行导通续流。这种调制方式可以抑制非换向期间非导通相的续流问题,并且通过调节换向期间的占空比可以有效抑制非导通相的电流脉动问题。实验结果进一步验证了提出方法的有效性。
This paper describes an investigation of an improved pulse width modulation （PWM） strategy for the brush- less DC （BLDC） motor drives. The traditional PWM strategy is analyzed and four switches joint modulation is proposed to control the current effectively during switches are off. At any time, only four switches in two legs of the six-switch in- verter are in operation during the mode of the conduction and its symmetrical switches are in operation during the free- wheeling mode. In the proposed scheme, the diode freewheeling of the inactive phase is eliminated, and the commuta- tion torque ripple is eliminated by adjusting duty cycle. The effectiveness of the proposed PWM methods is verified through experimental results.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2013年第6期79-83,111,共6页
Proceedings of the CSU-EPSA
基金
中央高校基本科研业务费专项资金资助项目(2013G1321043)
关键词
无刷直流电机
脉宽调制
转矩脉动
占空比
brushless DC motor
pulse width modulation（PWM）
torque ripple
duty cycle
