Maximum Efficiency per Torque Control of Permanent-Magnet Synchronous Machines

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...

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Bibliographic Details
Published in:Applied sciences 2016, Vol.6 (12), p.425-425
Main Authors: Guo, Qingbo, Zhang, Chengming, Li, Liyi, Zhang, Jiangpeng, Wang, Mingyi
Format: Article
Language:English
Subjects:
Aviation
Control algorithms
Copper
copper loss
Design
double Fourier integral analysis
Efficiency
efficiency improvement
fundamental loss
harmonic loss
Harmonics
iron loss
Mathematical analysis
Mathematical models
maximum efficiency per torque control
Optimization
Permanent magnets
PMSM
Pulse duration modulation
Strategy
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app6120425