Analysis of Analytical Magnetic Field and Flux Regulation Characteristics of Axial-Flux Permanent Magnet Memory Machine

Due to the high power density, short axial size, and wide permanent magnet (PM) flux linkage regulation range, an axial-flux PM memory machine (AFPMMM) with hybrid Halbach array is investigated in this article. To solve the problem of magnetic density variation of Halbach array composed of different...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2022-09, Vol.58 (9), p.1-9
Main Authors: Cao, Yongjuan, Feng, Liangliang, Mao, Rui, Li, Kang
Format: Article
Language:English
Subjects:
Air gaps
Analytical magnetic field
Analytical models
Arrays
axial-flux permanent magnet memory machine (AFPMMM)
Boundary conditions
Cartesian coordinates
Cylindrical coordinates
Finite element method
finite element method (FEM)
Flux density
flux regulation characteristic
Hysteresis models
Hysteresis motors
Magnetic circuits
Magnetic fields
Magnetic flux
Magnetic hysteresis
Magnetism
Mathematical analysis
Mathematical models
Permanent magnets
Stator windings
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Summary:Due to the high power density, short axial size, and wide permanent magnet (PM) flux linkage regulation range, an axial-flux PM memory machine (AFPMMM) with hybrid Halbach array is investigated in this article. To solve the problem of magnetic density variation of Halbach array composed of different types of PMs in asymmetric bilateral air-gap structure, the analytical method for calculating the air-gap flux density of AFPMMM is presented through mathematical analysis, which uses cylindrical coordinate system instead of Cartesian coordinate system and is solved by equivalent method, separated variable method, and boundary conditions. The magnetic field generated by the Halbach array is divided into three directions: radial, circumferential, and axial. The analytical model is compared with the finite element method (FEM) simulation results to verify its effectiveness. In addition, an approximate piecewise linear hysteresis model with parallelogram return line is established based on the analytical expression of magnetic field. By applying different pulse currents to change the residual flux density of PM, the flux regulation characteristics of the motor are studied, and it is found that the air-gap flux density of the motor can be smoothly adjusted by continuously changing the pulse current, which plays a positive role in solving the problem of online magnetic regulation of the motor.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2022.3194366