Direct torque control strategy of five‐phase PMSM with load capacity enhancement. Issue 3 (11th January 2019)

• Record Type: Journal Article
• Authors: Zhou, Yangzhong; Yan, Zhen; Duan, Qingtao; Wang, Lingbo; Wu, Xin
• Is Part Of: IET power electronics. Volume 12:Issue 3(2019)
• Page Start: 598
• Page End: 606
• Publication Date: 2019-01-11
• Subjects: stators -- synchronous motors -- machine control -- invertors -- digital control -- torque control -- permanent magnet motors -- control engineering computing; harmonic current injection -- stator current -- MTPA -- minimum copper loss -- phase relation -- third harmonic currents -- third harmonic fluxes -- optimal torque distribution ratio -- TMS320F2812‐based digital controller -- DTC experimental platform -- maximum load torque -- direct torque control strategy -- five‐phase permanent magnet synchronous motor -- PMSM -- DTC scheme -- five‐phase inverter -- output basic voltage vector -- discrete synthesised voltage vectors -- third harmonic planes -- maximum torque per ampere scheme; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2018.5203
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : A direct torque control (DTC) strategy of five‐phase permanent magnet synchronous motor (PMSM) is proposed in this study. The proposed DTC scheme uses five‐phase inverter to output basic voltage vector or discrete synthesised voltage vectors in one control period to realise the direct control of torque and flux on the fundamental and third harmonic planes simultaneously, and then realise the third harmonic current injection to enhance the load capacity. In order to realise the third harmonic current injection with maximum torque outputting and minimum peak of stator current, the maximum torque per ampere (MTPA) scheme is proposed in which the minimum copper loss and the same phase relation between fundamental and third harmonic currents are taken as the constraint conditions, and the amplitude of the fundamental and third harmonic fluxes and the optimal torque distribution ratio are derived in MTPA. A TMS320F2812‐based digital controller is adopted as a core to construct the DTC experimental platform of the five‐phase PMSM with 800 W rated power. The results of experiment and simulation show that the proposed DTC strategy can improve the maximum load torque of the motor, reduce the flux density of the stator and improve the core utilisation rate of the stator.