access icon free Fault-tolerant FOC for five-phase SPMSM with non-sinusoidal back EMF

© The Institution of Engineering and Technology
Received 15/01/2019, Accepted 10/04/2019, Revised 14/03/2019, Published 11/04/2019

A fault-tolerant field-oriented control (FOC) is proposed for five-phase surface-mounted permanent magnet synchronous motor (SPMSM) with non-sinusoidal back electromotive force under single-phase open-circuit fault. On the basis of the concept of preserving the circular rotation of fundamental magnetic motive force and PM flux linkage, the decoupled model of five-phase SPMSM under single-phase open-circuit fault is derived. To suppress the torque ripples caused by third-harmonic content of PM flux linkage, the closed-form solution of current references with zero-torque pulsation in the synchronous coordinate is presented. Then, the presented solution is used for obtaining optimum current references to achieve minimum stator winding losses and maximum available torque while satisfying the zero-torque-pulsation constraint. The optimal current references generation method is simple and is suitable for real-time implementation. The experimental results confirm that the proposed method can effectively suppress the torque ripples and produce lower stator winding losses as well as wider-torque operation range compared with traditional fault-tolerant FOC method.

Inspec keywords: electric potential; fault diagnosis; fault tolerant control; machine vector control; synchronous motors; stators; permanent magnet motors; torque control

Other keywords: nonsinusoidal back electromotive force; five-phase surface-mounted permanent magnet synchronous motor; optimal current references generation method; nonsinusoidal back EMF; maximum available torque; zero-torque pulsation; synchronous coordinate; circular rotation; third-harmonic content; minimum stator winding losses; zero-torque-pulsation constraint; SPMSM; torque ripple suppression; PM flux linkage; optimum current references; fault-tolerant field-oriented control; electromotive force; traditional fault-tolerant FOC method; fundamental magnetic motive force; single-phase open-circuit fault

Subjects: Control of electric power systems; Mechanical variables control; Synchronous machines

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