Performance Analysis of Modular In-Wheel Motor with Open-Circuit Faults Considering Temperature Limitation

In this paper, the fault-tolerant performances of a modular permanent magnet synchronous motor (PMSM) with various open-circuit faults are investigated considering temperature limitation. The motor is adopted 16/24 poles/slots and four modules structure. Firstly, the motor system and fault-tolerant principle are shown. Secondly, the fault-tolerant performances of the motor under various open-circuit faults are analyzed. These faults are divided into two cases, the general faults and extreme faults. The torque performance, losses and temperature distributions under these faults are analyzed respectively using various fault-tolerant strategies. The relationship between the overload multiple of the fault-tolerant current and the safe operation time is also discussed. The fault-tolerant strategy with the temperature analysis can give a more reasonable fault-tolerant current and make the output capacity of the motor maximized on the premise of the safe temperature rise.