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.
Highlights
Multi-phase motor drives are witnessing an increasing interest in research and in the industry in recent years
The novelty in this paper is that it proposes a sensorless-fault-tolerant control technique of a five-phase Permanent Magnet Synchronous Motor (PMSM) drive that enables the five-phase motor to continue operating in the case of single-phase open-circuit fault without introducing and hardware modification
The control scheme to achieve a fully sensorless control of a five-phase PMSM is shown in figure 15
Summary
Multi-phase motor drives are witnessing an increasing interest in research and in the industry in recent years. To maintain the performance of the five-phase motor drive post the fault, optimal current control is usually employed to control the current in the healthy phases to ensure certain optimization criteria including minimum torque ripples, equal phase currents, and minimum copper losses [13,14,15] This can be achieved by implementing a fault-tolerant technique post the fault. The novelty in this paper is that it proposes a sensorless-fault-tolerant control technique of a five-phase PMSM drive that enables the five-phase motor to continue operating in the case of single-phase open-circuit fault without introducing and hardware modification. The performance of this drive under an open-circuit fault is at the same quality as the performance under healthy operating condition.
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