AN APPROXIMATE CALCULATION FOR 3-D ELECTROMAGNETIC FIELD OF THE SLOT-SKEWED ELECTRICAL MACHINE BY USING 2-D FEM

摘要

A new approximate method, which uses 2D finite element technique to calculate 3D electromagnet field of electrical machine with skewed slot stator, is introduced. Being considered about stator skewed slot effect, the coupling equation of nonlinear 2D transient eddy field and 6xternal circuit for 12-phase synchronous generator-rectification system is established based on this method. The electromagnet field and no-load EMF of this electrical machine are calculated, the fact that tooth harmonic voltage is reduced obviously by skewed slot is analyzed. The calculation results are the same as those by using the permeance harmonic method, which demonstrates the new approximate method is not only feasible but also effective.