The Effect of the Inverter Supply on Core Losses in Axial Flux Permanent Magnet Motor
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The drive system that is used in AFPM machines includes a DC source and multi-level power inverter. Thus, the produced voltage has lots of harmonics that can be seen in the stator flux. Non-sinusoidal voltages applied to electrical machines may lead to overheating. This issue is very essential in optimizing the motor design because neglecting it makes the predicted motor efficiency vary from the real value. In this paper, we shall examine the consequences of the drive system on core losses in a 500 kW Non-slotted Axial Flux Permanent Magnet motor. Some details of the inverter supply and motor loss mechanisms are discussed, and loss calculation methods used in this paper are introduced. A 3D finite element model is applied to calculate and compare the motor core losses in sinusoidal and PWM voltage supplies. The results illustrate that in terms of using inverter supply the core losses in the stator core rise by roughly 50 percent at full load condition
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