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http://dx.doi.org/10.5370/KIEE.2014.63.10.1377

Eddy Current Loss Analysis in Radial Flux Type Synchronous Permanent Magnet Coupling using Space Harmonic Methods  

Min, Kyoung-Chul (Dept. of Electrical Engineering, Chungnam National University)
Kang, Han-Bit (Dept. of Electrical Engineering, Chungnam National University)
Park, Min-Gyu (Dept. of Electrical Engineering, Chungnam National University)
Cho, Han-Wook (Dept. of Electric, Electronic and Comm. Eng. Edu. Chungnam National University)
Choi, Jang-Young (Dept. of Electrical Engineering, Chungnam National University)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.63, no.10, 2014 , pp. 1377-1383 More about this Journal
Abstract
This paper deals with eddy current loss of magnetic coupling with radial permanent magnet (PM) using analytical method such as a space harmonic method. Superposition of two kinds analysis model is used to analyze eddy current loss induced in inner PM and outer PM of magnetic coupling. When the eddy current is induced, the environmental temperature increases, and the permanent magnet(PM) characteristics are degraded because the performance of PM is greatly influenced by temperature rise. Hence, the calculation of eddy current loss becomes an important factor in the magnetic coupling. In order to analyze eddy current loss, first, on the basis of the magnetic vector potential and two-dimensional(2-D) polar-coordinate system, the magnetic field solutions of the radial magnetized PM are obtained. And we obtain the analytical solutions for the eddy current density produced by permanent magnet. Lastly, analytical solutions for eddy current loss are derived by using equivalent, electrical resistance calculated from magnet volume and analytical solution for eddy current density. This analytical results are validated by comparing with the 2-D finite element analysis (FEA).
Keywords
Permanent magnet coupling; Eddy-current loss; Analytical solutions; FEA;
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