摘要：断电重投问题常见于无位置传感器无刷直流电机运行过程中，重投时强烈的电流与转矩冲击极易造成电机失步，甚至损坏电机与控制器。从冲击产生的原理出发，针对无位置传感器无刷直流电机的断电重投过程，从瞬态与稳态两个角度进行了分析。推导出了冲击电流的表达式，并提出了抑制冲击的方法。因此以滑模观测器为基础，设计了无位置传感器无刷直流电机寻优重投控制系统。最后，通过仿真验证，证明了该控制系统在抑制断电重投冲击方面的有效性。
关键词：无刷直流电机；断电重投；无位置传感器；滑模观测器
Abstract: Reclosing Process is pervasive in sensorless brushless DC motor drives, which can result in strong current and torque impacts to motors and their controllers. Generation principle of impacts to sensorless brushless DC motor was analyzed under transient and steady states. Expressions of impact current were derived, at the same time, a method of impact reduction was also proposed. Based on sliding mode observer, an optimization reclosing control system of sensorless brushless DC motor was designed. Simulation results demonstrate that the proposed control system is effective in the reduction of reclosing impacts to sensorless brushless DC motors.
Key words: brushless DC motor；power reclosing；sensorless；sliding mode observer