Analytical model and design of spoke-type permanent-magnet machines accounting for saturation and nonlinearity of magnetic bridges

Based on subdomain model, this paper presents an analytical method for predicting the no-load magnetic field distribution, back-EMF and torque in general spoke-type motors with magnetic bridges. Taking into account the saturation and nonlinearity of magnetic material, the magnetic bridges are equiva...

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Veröffentlicht in:Journal of magnetism and magnetic materials 2016-11, Vol.417, p.389-396
Hauptverfasser: Liang, Peixin, Chai, Feng, Bi, Yunlong, Pei, Yulong, Cheng, Shukang
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container_issue
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container_title Journal of magnetism and magnetic materials
container_volume 417
creator Liang, Peixin
Chai, Feng
Bi, Yunlong
Pei, Yulong
Cheng, Shukang
description Based on subdomain model, this paper presents an analytical method for predicting the no-load magnetic field distribution, back-EMF and torque in general spoke-type motors with magnetic bridges. Taking into account the saturation and nonlinearity of magnetic material, the magnetic bridges are equivalent to fan-shaped saturation regions. For getting standard boundary conditions, a lumped parameter magnetic circuit model and iterative method are employed to calculate the permeability. The final field domain is divided into five types of simple subdomains. Based on the method of separation of variables, the analytical expression of each subdomain is derived. The analytical results of the magnetic field distribution, Back-EMF and torque are verified by finite element method, which confirms the validity of the proposed model for facilitating the motor design and optimization. •The no-load magnetic field of poke-type motors is firstly calculated by analytical method.•The magnetic circuit model and iterative method are employed to calculate the permeability.•The analytical expression of each subdomain is derived..•The proposed method can effectively reduce the predesign stages duration.
doi_str_mv 10.1016/j.jmmm.2016.05.106
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subjects Analytical model
Design analysis
Lumped parameter magnetic circuit model
Magnetic bridge
Magnetic field distribution
Magnetic fields
Magnetic material
Magnetic materials
Mathematical analysis
Mathematical models
Motors
Nonlinearity
Saturation
Spoke-type permanent-magnet machines
title Analytical model and design of spoke-type permanent-magnet machines accounting for saturation and nonlinearity of magnetic bridges
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