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This paper presents a novel hall sensor fault detection and fault tolerant control system for Hall Effect position sensors failure of permanent magnet synchronous motor. The proposed system is capable to accurately detect and promptly identify exactly which of the Hall Effect sensors has undergone breakdown when the fault occurs. A simple method to generate the commutation signal even with faulty Hall Effect sensor to maintain the proper operation of PMSM after fault occurrence is discussed in this paper. The proposed fault tolerant control system does not need massive computational efforts and can be implemented as a subroutine in the main control program of the PMSM. In addition, the transitions between healthy and fault-tolerant control conditions are smooth without any additional noise and jerk. Experimental results have been presented to prove the validity of the proposed algorithm.

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