Overview of fault diagnosis theory and method for permanent magnet machine

Permanent magnet (PM) machines have been widely used in a variety of industrial and military applications due to their definite advantages of high power density and high efficiency. In some applications such as electric vehicles (EVs) and aircrafts, high reliability and security of the PM machine are critical. Hence, there is rapidly growing interest in strategies to improve the reliability and security of the PM machine from both academia and industry, where fault diagnosis is a requirement. In this paper, common faults of the PM machine are discussed, state of the art in fault diagnosis of PM machine are overviewed in detail, and different fault diagnosis methods are analyzed and compared. Finally, the development tendency of fault diagnosis techniques for the PM machine is prospected.