Duplication Control of Dual 3-Phase IPMSM Control

This paper presents a method to enhance the reliability of a dual 3-phase IPMSM (Interior Permanent Magnet Synchronous Motor) system with a parallel stator-winding structure by introducing redundancy in the motor, inverter, and rotor position sensors. The system includes two rotors on a single shaft, managed by one speed controller and two current controllers, allowing one motor to compensate if the other fails. Inverter redundancy ensures synchronized control and continued operation if one inverter fails. A sensorless control algorithm is implemented for emergency operation during position sensor failure, using resolver-based hardware and software-based sensorless fault detection. The IF(Current – Frequency) - sensorless control method provides stable emergency operation both at rest and in motion. The paper also introduces an improved speed controller for smooth transitions, with experimental results validating the algorithm's effectiveness.