基于Buck变换器调压的无刷直流电机功率变换器单管开路故障诊断  

Single Switch Open-circuit Fault Diagnosis in Brushless DC Motor Drivers With Buck Converters

作　　者：李文琢[1] 房建成[1] 李海涛[1] 

机构地区：[1]惯性技术国家级重点实验室(北京航空航天大学),北京市海淀区100191

出　　处：《中国电机工程学报》2013年第15期124-132,7,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(61203112);国家自然基金创新群体(61121003);国家重点基础研究发展计划项目(973项目)(2009CB72400101C)~~

摘　　要：功率变换器是无刷直流电机驱动系统中最易发生故障的薄弱环节,因此,功率变换器故障诊断成为无刷直流电机容错控制研究的关键。该文针对基于Buck DC-DC变换器调压的无刷直流电机三相全桥逆变器,根据其正常与故障状态下的不同工作特性,在现有单电流传感器的基础上,仅对直流母线电流进行采样,与电机360电角度内的6种工作状态相结合,提出了一种简单易行的故障诊断方法,实现三相全桥与Buck变换器功率管单管开路故障检测与识别,同时设计了故障保护电路,有效防止二次故障的发生。仿真与实验结果验证了该方法的可行性与有效性。The power inverters which frequently go wrong are the weakest part in brushless DC （BLDC） motor drive systems. Thus, fault diagnosis of power inverters is the key point in the fault-tolerant control of BLDC motors. In this paper, the normal and faulty operating states of BLDC motor power inverters with buck DC-DC converter before the three phase full bridge were analyzed in detail. A straightforward method of single open-switch fault diagnosis in three phase full bridge inverters and buck DC-DC converters of the motor driver was proposed with only one current sensor. The measured DC-link currents and the six different operating states in 360 electrical degrees were used to detect the single switch open-circuit fault andto identify the faulty switch. Also, a protective circuit was designed to avoid the occurrence of the secondary fault. Both simulation and experimental results carried out confirm the feasibility and effectiveness of the proposed method for diagnosing single switch open-circuit fault in power inverters.

关 键 词：无刷直流电机 BuckDC-DC变换器 三相全桥逆变器 单管开路故障诊断 

分 类 号：TM464[电气工程—电器]