Fault Redundancy Active Removal Fault-tolerant Strategy for Triple-redundancy PMSMs

The reliability requirements of the aviation electromechanical actuator system are high, and the three-redundancy motor is often used to provide reliable propulsion power. The triple-redundancy PMSMs is composed of a nine-phase stator winding and a permanent magnet rotor. When a redundancy fails, the fault redundancy is actively removed, and the use of other redundancy can still maintain the normal operation of the system to ensure that the entire system can maintain normal operation. However, the traditional 3-dq modeling method ignores the mutual inductance and flux linkage coupling between different windings, and it is difficult to achieve a smooth transition of redundancy removal. The purpose of this paper is to propose a decoupling control method for multi-stator modeling, which eliminates the cross-coupling of mutual inductance between redundancy and retains the modular control characteristics of 3-dq decoupling. When one or two redundant faults occur, the fault winding is actively removed to reduce the dynamic transition time of speed and torque during redundancy switching and realize the smooth transition of fault winding removal.