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Appl. Sci. 2016, 6(12), 425; doi:10.3390/app6120425

Maximum Efficiency per Torque Control of Permanent-Magnet Synchronous Machines

Department of Electrical Engineering, Harbin Institute of Technology University, Room 205, Building 2C, Science Park of Harbin Institute of Technology, No. 2 of Yikuang Street, Nangang District, Harbin 150001, China
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Author to whom correspondence should be addressed.
Academic Editor: Kuang-Chao Fan
Received: 16 September 2016 / Revised: 21 November 2016 / Accepted: 8 December 2016 / Published: 12 December 2016

Abstract

High-efficiency permanent-magnet synchronous machine (PMSM) drive systems need not only optimally designed motors but also efficiency-oriented control strategies. However, the existing control strategies only focus on partial loss optimization. This paper proposes a novel analytic loss model of PMSM in either sine-wave pulse-width modulation (SPWM) or space vector pulse width modulation (SVPWM) which can take into account both the fundamental loss and harmonic loss. The fundamental loss is divided into fundamental copper loss and fundamental iron loss which is estimated by the average flux density in the stator tooth and yoke. In addition, the harmonic loss is obtained from the Bertotti iron loss formula by the harmonic voltages of the three-phase inverter in either SPWM or SVPWM which are calculated by double Fourier integral analysis. Based on the analytic loss model, this paper proposes a maximum efficiency per torque (MEPT) control strategy which can minimize the electromagnetic loss of PMSM in the whole operation range. As the loss model of PMSM is too complicated to obtain the analytical solution of optimal loss, a golden section method is applied to achieve the optimal operation point accurately, which can make PMSM work at maximum efficiency. The optimized results between SPWM and SVPWM show that the MEPT in SVPWM has a better effect on the optimization performance. Both the theory analysis and experiment results show that the MEPT control can significantly improve the efficiency performance of the PMSM in each operation condition with a satisfied dynamic performance.
Keywords: maximum efficiency per torque control; efficiency improvement; PMSM; fundamental loss; harmonic loss; copper loss; iron loss; double Fourier integral analysis maximum efficiency per torque control; efficiency improvement; PMSM; fundamental loss; harmonic loss; copper loss; iron loss; double Fourier integral analysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Guo, Q.; Zhang, C.; Li, L.; Zhang, J.; Wang, M. Maximum Efficiency per Torque Control of Permanent-Magnet Synchronous Machines. Appl. Sci. 2016, 6, 425.

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