Torque Ripple Reduction in a Modular Drive of an Asymmetric Six-Phase Non-Sinusoidal Permanent Magnet Synchronous Motor with Dual Stator Winding

Abstract :

The use of multiphase Permanent Magnet Synchronous Motors (PMSMs) has gained significant attention due to advantages such as high power density and high efficiency in various applications where achieving maximum reliability is a fundamental design objective. This paper focuses on the control of an asymmetric six-phase PMSM, where, to enhance drive reliability, each stator phase consists of two separate winding segments physically aligned and symmetrically positioned relative to the stator center point. The control and power section of each phase is fully modular and independent of the control and power sections of other phases, with each of the two single-phase windings supplied by an independent single-phase H-bridge inverter.  Given the non-sinusoidal back-EMF of the phases and to reduce torque ripple, an optimal harmonic current injection method is employed along with quasi-proportional-resonant current controllers. Furthermore, in the event of a fault and the loss of two windings, a fault-tolerant control algorithm based on the elimination of the second harmonic of the electromagnetic torque is utilized. The effectiveness of the proposed control methods is validated through simulations in Simulink software. 

References:

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