Speed control of five-phase induction motor drives with an open phase fault condition and predictive current control methods

Multiphase drives offer interesting advantages against their conventional three-phase counterparts, particularly during the post-fault operation where the higher number of phases allows drive operation under fault conditions. Post-fault performance in multiphase drives can be obtained maintaining a maximum current level and preserving ripple-free operation. Predictive current control techniques have also shown their interest in high performance control application of multiphase drives. However, fault tolerance of conventional and predictive current control methods of multiphase drives have been briefly analyzed although the fault tolerance capability is a demanded feature in industrial applications. This paper analyzes the speed operation of a five-phase drive with an open phase fault condition. The conventional model based predictive current controller is modified to cope with the fault condition, and experimental results are provided to validate the proposed method.