Research on five-phase induction motor system control with third harmonic current injection

• Published in: Journal of engineering (Stevenage, England) England), 2017, Vol.2017 (13), p.2559-2563
• Main Authors: Zhu, Peng, Qiao, Mingzhong, Wei, Yongqing, Xia, Yihui
• Format: Article
• Language: English
• Subjects: air‐gap magnetic field; concentrated full‐pitch windings; dual‐plane rotation transformation; field‐oriented vector control method; five‐phase induction motor system control; induction motors; machine insulation; machine size; machine vector control; magnetic fluxes; MATLAB; nonlinear functions; nonsinusoidal power supply; power density; power switch capacity; quasi‐square air‐gap flux; rotor field‐oriented control; Simulink; third harmonic current injection
• ISSN: 2051-3305; 2051-3305
• DOI: 10.1049/joe.2017.0789

To enhance the power density of five-phase induction motor system, the structure with concentrated full-pitch windings is adopted, and then the five-phase motor system is drove by a non-sinusoidal power supply with third-harmonic injection. By dual-plane rotation transformation, the mathematic models in two orthogonal space planes, d1–q1 and d3–q3, were deduced. The magnetic fluxes in the fundamental and third-harmonic space were oriented on the d1 and d3 axes, and the corresponding equations of rotor field-oriented control were obtained. To satisfy the requirement of a quasi-square air-gap flux, the direct and quadrature current components in the third-harmonic plane as non-linear functions of the fundamental components are calculated. On the basis above, the field-oriented vector control method for a five-phase induction motor with the third-harmonic current injection was proposed. Finally, simulation by MATLAB/Simulink and experiment is implanted on the five-phase induction motor. The results indicate that the air-gap magnetic field gets improved, and the power density of five-phase induction motor is enhanced without any increase of power switch capacity and machine size.