Analytical model for magnetic field calculation of SPMSM with chamfered pole considering iron core saturation

To effectively optimise pole shape for surface-mounted permanent magnet synchronous machine (SPMSM), an analytical model of SPMSM with the chamfered pole is proposed for no-load and on-load magnetic field calculation. In this model, the pole of SPMSM is approximately segmented into pieces with regul...

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Bibliographic Details
Published in:IET electric power applications 2020-10, Vol.14 (10), p.1856-1864
Main Authors: Yu, Zhanyang, Li, Yan, Jing, Yongteng, Du, Jianmin, Wang, Zicheng
Format: Article
Language:English
Subjects:
air‐gap flux density
analytical model
chamfered pole
electric potential
electromagnetic torque
finite element analysis
harmonic distortion
iron core saturation
line no‐load
magnetic field parameters
magnetic fields
on‐load magnetic field calculation
outer rotor type SPMSM
permanent magnet machines
permanent magnet motors
pole shape
pole‐arc coefficient
regular shape
Research Article
rotors
surface‐mounted permanent magnet synchronous machine
synchronous machines
synchronous motors
torque
uniform magnet property
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Summary:To effectively optimise pole shape for surface-mounted permanent magnet synchronous machine (SPMSM), an analytical model of SPMSM with the chamfered pole is proposed for no-load and on-load magnetic field calculation. In this model, the pole of SPMSM is approximately segmented into pieces with regular shape and uniform magnet property, and magnetic field parameters can be obtained by subdomain superposition. Meanwhile, iron core saturation is considered to get a correction coefficient to revise air-gap flux density, inducing flux linkage, line no-load back electromotive force (EMF) and electromagnetic torque. Based on this analytical model, the geometry optimisation of PM can be optimised by end thickness of pole, pole-arc coefficient of cutting and remanence, and the waveform total harmonic distortion of air-gap flux density and no-load back EMF are greatly reduced. To verify the analytical model, an outer rotor type SPMSM with 20-poles and 72-slots for tractor application is designed and manufactured. Finally, the effectiveness of the improved method is validated by the finite-element method and experimental test.
ISSN:1751-8660
1751-8679
1751-8679
DOI:10.1049/iet-epa.2019.1013