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Energies 2017, 10(12), 2030; https://doi.org/10.3390/en10122030

System Efficiency Improvement for Electric Vehicles Adopting a Permanent Magnet Synchronous Motor Direct Drive System

Department of Electrical Engineering, Harbin Institute of Technology University, Room 205, Building 2C, Science Park of Harbin Institute of Technology, Nangang District, Harbin 150001, China
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Received: 18 October 2017 / Revised: 17 November 2017 / Accepted: 27 November 2017 / Published: 1 December 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

To improve the endurance mileage of electric vehicles (EVs), it is important to decrease the energy consumption of the Permanent Magnet Synchronous Motor (PMSM) drive system. This paper proposes a novel loss optimization control strategy named system efficiency improvement control which can optimize both inverter and motor losses. A nonlinear power converter loss model is built to fit the nonlinear characteristics of power devices. This paper uses double Fourier integral analysis to analytically calculate the fundamental and harmonic components of motor current by which the fundamental motor loss and harmonic motor loss can be accurately analyzed. From these loss models, a whole-frequency-domain system loss model is derived and presented. Based on the system loss model, the system efficiency improvement control method applies the genetic algorithm to adjust the motor current and PWM frequency together to optimize the inverter and motor losses by which the system efficiency can be significantly improved without seriously influence on the system stability over the whole operation range of EVs. The optimal effects of system efficiency is verified by the experimental results in both Si-IGBT-based PMSM system and SiC-MOSFET-based system. View Full-Text
Keywords: permanent magnet synchronous motor; inverter loss; fundamental loss; harmonic loss; double Fourier integral analysis; nonlinear loss model; system loss; efficiency optimization; SiC-MOSFET; electric vehicle permanent magnet synchronous motor; inverter loss; fundamental loss; harmonic loss; double Fourier integral analysis; nonlinear loss model; system loss; efficiency optimization; SiC-MOSFET; electric vehicle
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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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Zhang, C.; Guo, Q.; Li, L.; Wang, M.; Wang, T. System Efficiency Improvement for Electric Vehicles Adopting a Permanent Magnet Synchronous Motor Direct Drive System. Energies 2017, 10, 2030.

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