Fault Tolerance Method of Low-Resolution Hall Sensor in Permanent Magnet Synchronous Machine

The estimation of the motor rotor positions with high-precision based on low-resolution Hall sensors becomes an important trend to realize the vector control in low-cost permanent magnet synchronous machine (PMSM) based control systems. Most existing studies focus on the methods to improve the estimating precision of rotor positions, while the estimating precision of failed Hall sensors and the corresponding control strategies for fault tolerance is rarely explored. This paper proposes a method that can online estimate the position of a PMSM rotor with fault detection and fault tolerance. Such a method can achieve both stable and precise estimations on rotor position even when one or two Hall sensors fail. Meanwhile, it can meet the needs of vector control under variable speed and load on the PMSM. Finally, a dSPACE-based semi-physical simulation platform is established, which is used to validate the effectiveness of the proposed method with multiple experiments.