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.
Highlights
IntroductionPermanent-magnet synchronous machines (PMSM) are becoming a preferred choice for electric vehicle application, due to their high power density, high efficiency and high reliability [1,2,3,4]
Nowadays, permanent-magnet synchronous machines (PMSM) are becoming a preferred choice for electric vehicle application, due to their high power density, high efficiency and high reliability [1,2,3,4].Surface-mounted permanent magnet (SPM) machines are widely used because of their simple structure, which brings the advantages of easy manufacturing, maintenance, and recycling
The current excitation is the same sinusoidal current waveform when the PMSM operates at certain load conditions in both models
Summary
Permanent-magnet synchronous machines (PMSM) are becoming a preferred choice for electric vehicle application, due to their high power density, high efficiency and high reliability [1,2,3,4]. Surface-mounted permanent magnet (SPM) machines are widely used because of their simple structure, which brings the advantages of easy manufacturing, maintenance, and recycling. The main problem with SPM machines is the existence of losses. Iron losses can account for a significant component of the total loss in PM machines [5,6,7]. The problem of the stator iron losses in synchronous machines has been deeply analyzed [9,10,11,12,13]. Most of them are partly or totally using finite-element method
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