Analysis method of eddy current loss in magnet of permanent magnet motor

摘要

PPROBLEM TO BE SOLVED: To analyze an eddy current loss by shortening a calculation time, and to highly precisely analyze the eddy current loss including the magnetic resistance of a stator. PSOLUTION: In a step (S1), the analysis of the whole motor is performed as two-dimensional static magnetic field analysis by considering that a reaction magnetic field created by in-magnet eddy currents is made smaller and more ignorable than a magnetic field created by armature currents and a magnet. In steps (S2-1) and (S2-2), three-dimensional analysis for calculating an eddy current loss in a magnet is performed by a step-by-step method by defining only a magnet as an analytic region, and three-dimensional analysis under no consideration of a reaction magnetic field created by the eddy currents in the step (S2-1), and three-dimensional analysis under consideration of a reaction magnetic field created by the eddy currents in the step (S2-2). Furthermore, the three-dimensional eddy current loss analysis of the magnet is performed by calculating the magnetic resistance of the whole motor to the eddy currents of the magnet by the two-dimensional analysis of the whole motor in which the magnetizing quantity M of the magnet is changed, and thus replacing this with an equivalent gap. PCOPYRIGHT: (C)2010,JPO&INPIT