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Energies 2017, 10(12), 2173; https://doi.org/10.3390/en10122173

Investigation of the Magnetic Circuit and Performance of Less-Rare-Earth Interior Permanent-Magnet Synchronous Machines Used for Electric Vehicles

1
Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150080, China
2
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150080, China
*
Author to whom correspondence should be addressed.
Received: 21 November 2017 / Revised: 9 December 2017 / Accepted: 11 December 2017 / Published: 19 December 2017

Abstract

The less-rare-earth interior permanent-magnet synchronous machines (LRE-IPMSMs), which have the advantages of high power density, high efficiency, and low cost, are promising candidates for electric vehicles (EVs). In this paper, the equivalent magnetic circuit (EMC) of LRE-IPMSM is established and analyzed to investigate the machine design principles, and then the performance of an optimized machine is analyzed. Firstly, the equivalent magnetic circuits of the LRE-IPMSM are established by taking the saturation effect into consideration. Secondly, the effects of geometric parameters, such as the permanent-magnet (PM) width, the PM thickness, the flux barrier thickness, the flux barrier span angle, and the bridge width, on no-load flux, q-axis flux, and d-axis flux are investigated, respectively. The results calculated by the EMC method and finite-element analysis (FEA) are analyzed and compared, which proves the effectiveness of the EMC method. Finally, an optimized design of LRE-IPMSM obtained by the magnetic circuit analyses is proposed. The electromagnetic performances and mechanical strength of the optimized LRE-IPMSM are analyzed and verified, respectively. View Full-Text
Keywords: less rare earth; interior permanent-magnet synchronous machines; equivalent magnetic circuit (EMC); electromagnetic performance; mechanical strength less rare earth; interior permanent-magnet synchronous machines; equivalent magnetic circuit (EMC); electromagnetic performance; mechanical strength
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Zheng, P.; Wang, W.; Wang, M.; Liu, Y.; Fu, Z. Investigation of the Magnetic Circuit and Performance of Less-Rare-Earth Interior Permanent-Magnet Synchronous Machines Used for Electric Vehicles. Energies 2017, 10, 2173.

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