High Performance Three-Phase PMSM Open-Phase Fault-Tolerant Method Based on Reference Frame Transformation

Open-phase fault may lead to motor efficiency and performance degradation. Various fault-tolerant methods have been proposed to reconfigure the controller and to track the sinusoidal current references. Unfortunately, the time-varying sinusoidal current commands are difficult to be tracked. In order to improve open-phase permanent magnet synchronous motor (PMSM) performance, a new open-phase PMSM fault-tolerant method is proposed in this paper, which is realized based on a novel reference frame transformation. With the new frame transformation, the position-dependent sinusoidal current commands are transformed to dc variables. Thus, the current controller design becomes very easy (PI controller is enough). The experimental results confirm that with the proposed method the PMSM fault-tolerant performance is enhanced distinctly compared with the conventional fault-tolerant methods.