Abstract
This paper describes the eddy current loss analysis of a double-sided cored slotless-type permanent magnet linear synchronous generator using the space harmonic method. To calculate the eddy current, an analytical solution was derived by applying the Maxwell equation, magnetic vector potential, and Faraday’s law in a two-dimensional (2-D) Cartesian coordinate system. Based on the armature reaction field distribution produced by the armature winding current, we obtained an analytical solution for the eddy current density distribution. Then, an analytical solution for eddy current loss induced in a permanent magnet (PM) was derived using the equivalent electrical resistance calculated from the PM’s volume and eddy current density distribution solution. Finally, the resulting current was determined based on analysis of the eddy current loss. The analytical results produced using this application of the space harmonic method were validated extensively through comparison with finite element method results.
Highlights
Owing to high energy densities of Nd-Fe-B permanent magnets, they can be miniaturized, which in turn enables the production of relatively lightweight, high-efficiency permanent magnet generators
This paper described an analytically driven interpretation of eddy current losses in a doublesided cored slotless-type permanent magnet linear synchronous generator with a Halbach array
After modeling the armature current density in terms of space and time harmonics, the magnetic field distribution owing to the armature current based on the magnetic vector potential in a 2-D Cartesian coordinate system was applied to obtain the governing equation coefficients
Summary
Owing to high energy densities of Nd-Fe-B permanent magnets, they can be miniaturized, which in turn enables the production of relatively lightweight, high-efficiency permanent magnet generators. High eddy currents can cause an increase in temperature in a permanent magnet, causing it to operate at the knee point of the B–H curve, and tend towards demagnetization This potential degradation of PMLSG performance makes eddy current loss analysis significantly important at the time of initial design.[4] Eddy current analysis has been performed widely using both the finite element method (FEM) and analytical methods. The number of initial parameters used is often limited, and increasing the size of the initial model or changing the design parameters is not frequently done in FEM analysis and is difficult in reality As they can be used to obtain analysis results quickly, it is often advantageous to use an analytical method in the initial design. The space harmonic method to calculate the eddy current loss of a double-sided cored slotless-type PMLSG
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