Fault diagnosis of low-cost hall-effect sensors used in controlling permanent magnet synchronous motor

摘要

Hall-effect sensors are wildly utilized to estimate rotor angle of permanent magnet synchronous motor (PMSM) in low-cost situations using vector control. A variety of estimation algorithms have been proposed to improve the precision of the estimated rotor position, while few literatures so far dedicate in dealing with Hall-effect sensor faults. In this paper, the types of sensor faults are divided into three kinds according to the number of faulted sensors. Here, the amount and position of faulted elements are identified based on the output signals, with improved orthogonal Phase Locked Loop. Single and double sensor faults in this case are analyzed, and corresponding solutions are also present to guarantee the continuous operation of PMSM within a certain period. The simulations based on MATLAB/Simulation are established with speed and load changing and the results show a nice fault-tolerant performance. Furthermore, the limitations of strategies are discussed in the end.