Design and Verification for the Torque Improvement of a Concentrated Flux-Type Synchronous Motor for Automotive Applications

In this paper, the design of the concentrated flux-type synchronous motor (CFSM) using ferrite permanent magnets to improve torque is proposed for an automotive chassis actuator. The thin pancake type CFSM of this paper has considerable axial magnetic leakage flux due to structural reasons. It is, t...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2019-07, Vol.55 (4), p.3534-3543
Main Authors: Park, Jong-Hyun, Jung, Kyung-Tae, Jung, Young-Hoon, Lim, Myung-Seop, Yoon, Myung-Hwan, Hong, Jung-Pyo, Jung, Jae-Woo
Format: Article
Language:English
Subjects:
Actuators
Air gaps
Alternate-stacking cores
automotive chassis actuator
axial magnetic leakage flux
Chassis
Circuit design
concentrated flux-type synchronous motor (CFSM)
Equivalence
equivalent magnetic circuit (EMC)
ferrite permanent magnet (PM)
Finite element analysis
Finite element method
Flux density
Leakage
Magnetic circuits
Magnetic cores
Magnetic flux
Magnetic separation
Permanent magnets
rotor overhang
Rotors
Saturation magnetization
shape ratio (SR)
Synchronous motors
Torque
torque improvement
Two dimensional analysis
two-dimensional (2-D) equivalent method
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Summary:In this paper, the design of the concentrated flux-type synchronous motor (CFSM) using ferrite permanent magnets to improve torque is proposed for an automotive chassis actuator. The thin pancake type CFSM of this paper has considerable axial magnetic leakage flux due to structural reasons. It is, therefore, necessary to improve the torque. In order to meet the required specifications in a constrained installation space, this paper proposes two methods for torque improvement. The first method is the alternate-stacking core as this structure removes the magnetic leakage flux path. The second method is the rotor overhang that increases the air-gap flux density. Furthermore, the structures require a three-dimensional (3-D) finite element method (FEM) analysis for accuracy. However, to analyze the characteristics easily and quickly, the 3-D structure is made into the equivalent 2-D FEM through an analytical method using an equivalent magnetic circuit. Finally, in this paper, the validity of the design process and the effectiveness for torque improvement is verified through experiments.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2019.2906296