Open AccessDirect torque control strategy of five‐phase PMSM with load capacity enhancement
Author(s) -
Zhou Yangzhong,
Yan Zhen,
Duan Qingtao,
Wang Lingbo,
Wu Xin
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2018.5203
Subject(s) - control theory (sociology) , direct torque control , stator , torque , vector control , harmonic , copper loss , torque density , damping torque , voltage , computer science , engineering , induction motor , physics , electrical engineering , control (management) , acoustics , artificial intelligence , thermodynamics
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.