Abstract
The output torque of an interior permanent magnet synchronous motor (IPMSM) can be controlled within its allowable range using a pulse-width modulation (PWM) inverter. In this paper, the effect of the load torque on the iron losses of an IPMSM is studied by investigating three driving conditions, namely no-current, no-load and load conditions. The experimental data demonstrates that a torque increase from 0 N·m to 1 N·m causes an iron loss increase of about 20 %. Three-dimensional (3D) finite element analysis (FEA) is performed and demonstrates that the magnet eddy current losses are the most affected by the torque increase.
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