制御系まで含めた永久磁石モータの磁気回路解析

概要

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The recent importance of designing and analyzing permanent magnet (PM) motors taking into consideration magnetic nonlinearity, torque ripple due to slot harmonics, and the eddy current loss of rare-earth magnets is increasing following an increase in the power density of PM motors. In addition, both their drive circuits and controllers should be taken into account together since powerful and efficient motor drives are not achieved without current vector control. The finite element method (FEM) is widely used for designing and analyzing motors, but it is difficult to take current vector control into account. The magnetic circuit method has a simple analytical model and it is relatively accurate for calculations. Furthermore, electric-magnetic-mechanical coupled analysis can easily be carried out. We propose here a method of calculating a magnetic circuit for a PM motor with MATLAB/Simulink, and discuss a demonstration simulated using current vector control.