Analytical Model of a Spoke-Type Permanent Magnet Synchronous In-Wheel Motor With Trapezoid Magnet Accounting for Tooth Saturation

This paper presents an analytical model for the prediction of the performance in a spoke-type permanent magnet synchronous in-wheel motor with a trapezoid magnet accounting for tooth saturation. The impact of magnet shape on modeling is considered. To match the standard boundary conditions, the trap...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 66; no. 2; pp. 1162 - 1171
Main Authors Liang, Peixin, Chai, Feng, Yu, Yanjun, Chen, Lei
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Air gaps
Analytical calculation
Analytical models
Back electromotive force
Boundary conditions
Finite element method
lumped magnetic circuit model (LMCM)
Magnetic analysis
Magnetic circuits
magnetic field distribution
Magnetic fields
Magnetic flux
Magnetism
Mathematical analysis
Mathematical model
Mathematical models
Model accuracy
Motors
Performance evaluation
Permanent magnet motors
Permanent magnets
Saturation
Saturation magnetization
spoke-type permanent magnet synchronous in-wheel motor (STPMSIWM)
trapezoid magnet
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Summary:This paper presents an analytical model for the prediction of the performance in a spoke-type permanent magnet synchronous in-wheel motor with a trapezoid magnet accounting for tooth saturation. The impact of magnet shape on modeling is considered. To match the standard boundary conditions, the trapezoid magnet is simplified to sector magnets. According to the invariance principle of the magnetic field created by the magnet, the dimension of the sector magnet is calculated with a lumped magnetic circuit model. Then, the motor is divided into six subdomains, i.e., shaft, inner sector magnet, outer sector magnet, rotor slot, air-gap, and stator slot. Based on the boundary conditions, the magnetic field, back electromotive force, and torque are obtained by solving Poisson's and Laplace's equations. The effect of tooth saturation is considered. The finite-element method and experiments are employed to validate the accuracy of the analytical model. In addition, the proposed method can also be used to evaluate the performance of the spoke-type motor with any irregular magnet.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2018.2831194