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Energies 2017, 10(3), 320; doi:10.3390/en10030320

Analytical Calculation of Magnetic Field Distribution and Stator Iron Losses for Surface-Mounted Permanent Magnet Synchronous Machines

National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Haidian District, Beijing 100081, China
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Author to whom correspondence should be addressed.
Academic Editor: K.T. Chau
Received: 22 December 2016 / Revised: 23 February 2017 / Accepted: 28 February 2017 / Published: 7 March 2017
(This article belongs to the Collection Electric and Hybrid Vehicles Collection)
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Abstract

Permanent-magnet synchronous machines (PMSMs) are widely used in electric vehicles owing to many advantages, such as high power density, high efficiency, etc. Iron losses can account for a significant component of the total loss in permanent-magnet (PM) machines. Consequently, these losses should be carefully considered during the PMSM design. In this paper, an analytical calculation method has been proposed to predict the magnetic field distribution and stator iron losses in the surface-mounted permanent magnet (SPM) synchronous machines. The method introduces the notion of complex relative air-gap permeance to take into account the effect of slotting. The imaginary part of the relative air-gap permeance is neglected to simplify the calculation of the magnetic field distribution in the slotted air gap for the surface-mounted permanent-magnet (SPM) machine. Based on the armature reaction magnetic field analysis, the stator iron losses can be estimated by the modified Steinmetz equation. The stator iron losses under load conditions are calculated according to the varying d-q-axis currents of different control methods. In order to verify the analysis method, finite element simulation results are compared with analytical calculations. The comparisons show good performance of the proposed analytical method. View Full-Text
Keywords: permanent magnet synchronous machine; magnetic field distribution; iron losses; analytical calculation permanent magnet synchronous machine; magnetic field distribution; iron losses; analytical calculation
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Tian, Z.; Zhang, C.; Zhang, S. Analytical Calculation of Magnetic Field Distribution and Stator Iron Losses for Surface-Mounted Permanent Magnet Synchronous Machines. Energies 2017, 10, 320.

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