Torque Enhancement of Dual Three-Phase PMSM by Harmonic Injection

Hu, Yashan and Huang, Keyuan and Li, Xuefei and Luo, Derong and Huang, Shoudao and Ma, Xiandong (2020) Torque Enhancement of Dual Three-Phase PMSM by Harmonic Injection. IET Electric Power Applications, 14 (9). 1735 - 1744. ISSN 1751-8660

Text (PMSM by Harmonic Injection paper)
PMSM_by_Harmonic_Injection_paper.pdf - Accepted Version
Available under License Creative Commons Attribution-NonCommercial.
Download (1MB)

Abstract

The torque enhancement of dual three-phase permanent magnet synchronous machine (DT-PMSM) drive system by full exploitation of flux-linkage and current harmonics are comparatively studied in this paper. The torque capability of DT-PMSM is previously evaluated with strategies of harmonics utilization, i.e. Strategy-1 of 3rd harmonic utilization and Strategy-2 of 5th and 7th harmonic utilization, which can extend the torque capability by 18.2% and 9.0% respectively. However, the full exploitation of harmonics including 3rd, 5th and 7th harmonics in the dual three-phase system are not addressed. In this paper, the Strategy-3 of 3rd, 5th and 7th harmonic utilization is also included. Its corresponding harmonic current control is proposed and the average torque and harmonic torque are analyzed in detail. Based on a test rig with existing prototype DT-PMSM, the torque with Strategy-3 is increased up to 26.5%, which is superior to the previous strategies.