A Fault Tolerant Control Strategy of Open-end winding DC-biased Vernier Reluctance Machine based on Inverter Topology Reconstruction

The DC-biased vernier reluctance machine (DC-biased-VRM) is a novel machine that integrates the DC bias current and AC current in a single armature winding, it is suitable for aviation starter generator, mining machinery, turbocharged motor occasions. Therefore, it is of great significance to improve the system reliability to promote the practical process of the motor system. This paper proposes a fault tolerant control strategy of open-end winding DC-biased-VRM based on inverter topology reconstruction. When open circuit fault appears in inverter bridge arms, the controller will reconstruct the inverter topology using bidirectional thyristor. Combined with fault tolerant current control strategy, the proposed scheme can maintain the output capacity after one or more switching devices have open fault. Meanwhile, the current stress of the switching device and the PWM control strategy under fault-tolerant control mode are also analyzed. Finally, the effectiveness of the proposed strategy is validated experimentally on a prototype machine, and the proposed strategy provides a strong fault tolerance adaptability.