Ferrite PM Optimization of SPM BLDC Motor for Oil-Pump Applications According to Magnetization Direction

This paper proposes optimizing the magnetization direction of isotropic ferrite permanent magnets (Fe-PM) to enable the maximization of back-electromotive force (B-EMF), torque density, and minimum torque ripple of surface permanent magnet brushless direct current motor. The concept design is divide...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2020-06, Vol.30 (4), p.1-1
Main Authors: Liu, Huai-Cong, Kim, Hyunwoo, Jang, Hyungkwan, Jang, Ik-Sang, Lee, Ju
Format: Article
Language:English
Subjects:
Air gaps
Back electromotive force
brushless direct current motor (BLDC)
Brushless motors
Circuits
Copper loss
D C motors
Direct current
electric oil pump
Electromotive forces
ferrite permanent
Ferrites
Finite element analysis
Finite element method
Flux density
Magnetic flux
Magnetism
Magnetization
magnetization direction
Mathematical models
Neodymium
Optimization
Permanent magnets
Powders
Shape
Stress concentration
Torque
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Summary:This paper proposes optimizing the magnetization direction of isotropic ferrite permanent magnets (Fe-PM) to enable the maximization of back-electromotive force (B-EMF), torque density, and minimum torque ripple of surface permanent magnet brushless direct current motor. The concept design is divided into two steps. First, two general Fe-PM electric oil pump motor models with radial and parallel magnetization are selected and compared with the neodymium permanent magnet models. Secondly, a finite element method (FEM) analysis is carried out with two different magnetization directions for each of the models in open-circuit and load operation. For more accurate results, the effects of no-load B-EMF, magnetic field distribution, air-gap flux density, copper loss, and efficiency are investigated. Finally, the validity and superiority of the FEM design results are confirmed by manufacturing the prototype motor and performing an experiment.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2020.2977615