Abstract
This article proposes an analytical model of modular spoke-type permanent magnet (MSTPM) machines based on air-gap field modulation (AFM) theory. Firstly, a fundamental AFM model of open-circuit MSTPM machines is introduced. The open-circuit air-gap field of MSTPM machines is determined by three fundamental elements including the primitive magnetizing magnetomotive force (MMF) produced by permanent magnet (PM), and two modulators which consist of stator and rotor permeance. The analytical MMF excited by PM (PM-MMF) can be calculated by using magnetic circuit method, while the stator and rotor permeance models are developed based on relative permeance (RP) method. Thereafter, a general model is proposed to calculate the open-circuit back electromotive force (EMF) of MSTPM machines. Further, the winding inductance model is established on the basis of equivalent magnetic circuit method and RP model. Finally, the machine performance is predicted by the analytical model, and verified by both finite element analysis (FEA) and experimental results.
Highlights
IN recent years, in-wheel traction (IWT) machines have been increasingly hot research topics due to the high torque density, and excellent system efficiency [1]-[3]
According to the available literature, a variety of machine topologies have been designed for the IWT applications, including the switched reluctance (SR) machines [4], the surface permanent magnet (SPM) machines [5], the V-shaped interior permanent magnet (IPM) machines [2], the flux-switching permanent magnet (FSPM) machines [1], the magnetic gear (MG) machines [6], etc
A general analytical model of modular spoke-type permanent magnet (MSTPM) machines has not been built in existing literature, with magnetic field, back-electromotive force (EMF), and winding inductance included
Summary
IN recent years, in-wheel traction (IWT) machines have been increasingly hot research topics due to the high torque density, and excellent system efficiency [1]-[3]. An analytical prediction of air-gap field in MSTPM machines has been derived based on conformal mapping method [7]. A general analytical model of MSTPM machines has not been built in existing literature, with magnetic field, back-EMF, and winding inductance included. It is certain that an analytical model of the MSTPM machines can be built based on the general AFM theory. Two-dimensional (2D) finite element analysis (FEA) projects are built, and corresponding prototyped machines are assembled and tested to verify the analytical results
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