Sensorless Speed Control of a Fault-Tolerant Five-Phase PMSM Drives

Abstract

This paper introduces a novel method to achieve sensorless speed control of a Five-phase Permanent Magnet Synchronous Motor (PMSM) drive in case of a single-phase open-circuit fault regardless which phase is open. The motor performance when an open circuit fault occurs is as good as it is before the fault. The degradation in motor performance, when an open circuit fault occurs, is minimized due to implementing a novel control technique that is using the four remaining healthy currents. This strategy includes introducing two software modifications to the operation of the five motor post the fault. Firstly, an asymmetric SVPWM is used post the fault instead of multi-dimension SVPWM that is used before the fault. Secondly, a new algorithm is introduced to track the saliency post the fault. The new algorithm is considering the application of the new modulation technique. Moreover, it uses only the excitation in the healthy currents of the motor due to the IGBT switching actions. Simulation results presented in this paper shows that the performance of the motor over a wide speed range and at different load conditions is maintained post the fault.

Sensorless control of five-phase PMSM drives post the failure in two phases

“…It should be mentioned that the papers [38][39] have presented a new algorithm to obtain the saliency position post the failure in one phase. But yet, no paper deals with saliency tracking post the failure in two phases.…”

“…For example, if the motor is running under the normal operating conditions, then, the symmetric SVPWM will be implemented and at the same time, the algorithm proposed in [36][37] will be used to track the saliency. While the Asymmetric SVPWM and the associated saliency tracking algorithm will be used in the case of a fault in phase 'A' [38][39]. Finally, the new SVPWM techniques and saliency tracking algorithms proposed in this work will be used post the failures in the adjacent phase 'A' and 'B' and the nonadjacent phase 'B' and 'E' respectively.…”

Control of 7-phase permanent magnet synchronous motor drive post three failures

“…The techniques that are used to achieve that are model-based techniques, DTC, and voltage and current excitation methods [32]- [36]. Recently, some techniques have been proposed to maintain the operation of the multiphase drive system post the two types of faults which are: the open-circuit fault in one phase of the multi-phase drive in addition to the fault in the encoder [37], [38].…”