Position Signal and Nonconduction Phase Current Based Fault Diagnosis Method of Position Sensor for Doubly Salient Electromagnetic Motor
Yijun Zhang, Bo Zhou, Wenjing Fang, Yi Lu, Siyuan Jiang · IEEE Transactions on Power Electronics · 2024
Reliable rotor position information is essential for accurate commutation control of motor drive system. Traditionally, hall sensors have been widely used to obtain rotor position information. The fault of position sensor will lead to the confusion of the commutation logic, which will reduce the output torque of the motor and even fail to operate normally. Therefore, fault diagnosis of position sensor is the key technology to improve the reliability of the system. In this paper, a fault diagnosis method of position sensor is proposed for doubly salient electromagnetic motor (DSEM) drive system, which only needs the existing position signals, the driving signals of switch, and the non-conduction phase current. Compared with the existing method, the proposed method does not require additional hardware and complex calculation, can realize the fault diagnosis of single, two and three position sensors, and is not influenced by the variation of speed and load. Besides, the time of error commutation for the proposed method is less than 1/3 electrical angle period, which is helpful to switch the fault-tolerant strategy in time and minimize the damage to the system caused by the fault. In order to verify the effectiveness of the proposed method, experiments are carried out on a 12/8 pole DSEM equipped with three hall position sensors. The experimental results under both steady and dynamic conditions show that the proposed method can quickly realize fault location.