Abstract

This paper proposes a new closed-loop control strategy which improves the quality of the torque output of an open-end winding (OEW) permanent magnet synchronous motor (PMSM) with common DC bus. Such a configuration provides a path for the zero sequence currents (ZSC) to flow in the windings. The analysis of the system revealed that these currents result in electromagnetic torque oscillation. It has also been established that the zero sequence currents are caused mainly by the third harmonic component of the back electromotive force (EMF). The research and a thorough analysis of the OEW PMSM showed that the existing methods of minimising the torque ripple cannot be applied when the leakage inductance of a machine is small, because the zero sequence component can no longer be considered as one additional degree of freedom that can be managed. Therefore, a new control strategy presented in this paper was proposed. The strategy is validated in simulation.

Highlights

  • Open-End Winding permanent magnet synchronous motor (PMSM) drive with a common DC bus features a dual inverter topology and a single DC power source

  • The new control strategy presented in this paper that does not introduce any zero sequence voltage (ZSV) on the inverter side is the appropriate solution to minimise the torque ripple output due to the third harmonic of the back electromotive force (EMF) in such types of the machines

  • The third harmonic of the back EMF causes the zero sequence currents to circulate in the open-end winding (OEW) PMSM drives with common DC bus

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Summary

INTRODUCTION

Open-End Winding PMSM drive with a common DC bus features a dual inverter topology and a single DC power source. According to the comparison of the inverter arrangements considered in [1] its major advantages are fault tolerance, compact design, and high torque per volume ratio Such an arrangement is well suited for the implementation of different power device technologies such as IGBT and Silicon Carbide (SiC). Less wire turns result in a lower leakage inductance Such an inductance could induce a high ZSC spikes in the stator if ZSV is introduces even for a short period of time. When the ZSV is not applied, the ZSC becomes induced from another source, such as the 3rd harmonic back EMF The developed method uses a proportional integral plus adaptive resonant controller (PI+RC) on the quadrature current branch in order to compensate the torque ripple caused by the ZSC due to the 3rd harmonic of the back EMF

MODELING OF THE OEW PMSM OUTPUT TORQUE
PROPOSED CONTROL METHOD
SIMULATION RESULTS
CONCLUSION
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