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Title Three Phase Drive Transfer Algorithm for Fault Tolerance Control of Six-Phase PMSM
Authors Seong-Hoon Kim ; Won-Jin Jang ; Kwan-Yuhl Cho ; Hag-Wone Kim
DOI 10.6113/TKPE.2021.26.4.256
Page pp.256-262
ISSN 1229-2214
Keywords 6-phase PMSM; Fault-tolerance; Balancing control
Abstract Six-phase motors can be used in industrial applications, such as an electric vehicle, due to their high reliability and low current magnitude per phase. An asymmetrical PMSM with two sets of three-phase windings is a commonly used structure for six-phase motors, with each winding set demonstrating a phase difference of 30°. Although the asymmetrical PMSM presents low torque ripples, its dynamic torque response deteriorates due to coupled components in the two three-phase windings. The decoupled VSD control is applied to eliminate the coupling effect. Load ratio control of two inverters for the six-phase PMSM is proposed in this study. DQ currents are controlled on the basis of two synchronous reference frames, and the six-phase drive system can be changed to a three-phase drive system when one inverter presents fault conditions. The operation and effectiveness of the proposed algorithm is verified through simulation and experiments. The six-phase drive system is transferred to a three-phase drive system by changing the current reference of the second DQ reference frame. Moreover, control of both torque and speed exhibits satisfactory performance before and after the mode change.