Abstract
This paper proposed an analytical method, based on conformal mapping (CM) method, for the accurate evaluation of magnetic field and eddy current (EC) loss in fault-tolerant permanent-magnet (FTPM) machines. The aim of modulation function, applied in CM method, is to change the open-slot structure into fully closed-slot structure, whose air-gap flux density is easy to calculate analytically. Therefore, with the help of Matlab Schwarz-Christoffel (SC) Toolbox, both the magnetic flux density and EC density of FTPM machine are obtained accurately. Finally, time-stepped transient finite-element method (FEM) is used to verify the theoretical analysis, showing that the proposed method is able to predict the magnetic flux density and EC loss precisely.
Highlights
Open-slot fault-tolerant permanent-magnet (FTPM) machines attract increasing attention due to the increasing requirement of high reliability in safety-critical applications.[1]
By considering the impact of skin effect and magnetic reaction, this harmonic model provided an accurate evaluation of eddy current (EC) loss
In Ref. 6, Chen et al proposed an analytical method based on the generalized image theory to predict 3-D EC loss and the analytical results are in a good agreement with finite-element method (FEM) ones
Summary
Open-slot fault-tolerant permanent-magnet (FTPM) machines attract increasing attention due to the increasing requirement of high reliability in safety-critical applications.[1]. Numerous analytical methods have been proposed to calculate the EC loss accurately. H. Polinder et al proposed a 1-D analytical model to predict the EC loss in segmented magnets.[4] the magnetic flux density was invariable over the magnet width and the magnetic flux reaction was neglected as well. The 2-D analytical model considering the effect of width on EC loss was proposed in Ref. 5. By considering the impact of skin effect and magnetic reaction, this harmonic model provided an accurate evaluation of EC loss. In Ref. 6, Chen et al proposed an analytical method based on the generalized image theory to predict 3-D EC loss and the analytical results are in a good agreement with finite-element method (FEM) ones. In this paper, an analytical method based on CM method will be proposed to analyze the EC loss of an open-slot FTPM machine
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