Self-Excited Wound-Field Synchronous Motors for xEV

Paper #:
  • 2017-01-1249

Published:
  • 2017-03-28
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Abstract:
Compact, high efficiency and high reliability is required for an xEV motor generator. IPM rotors with neodymium magnet are widely applied for xEV motors to achieve these requirements. However, the neodymium magnet material has a big impact on motor cost and there is supply chain risk due to increased usage of these rare earth materials for future automotive xEV’s. On the other hand, a wound-field rotor does not need magnets and can achieve equivalent performance to an IPM rotor. However, brushes are required in order to supply current to the winding coil of the rotor. This may cause insulation issues on xEV motors which utilize high voltage and high currents. Therefore, it can be suggested to develop a system which supplies electric energy to the rotor field winding coil from stator without brushes by applying a transformer between stator coil and rotor field winding. Specifically, add auxiliary magnetic poles between each field winding poles and wind sub-coils to these poles. The magnetic flux generated from the stator induces field current in the sub-coils. Rectifying the induced current by a diode enables applying direct current to the field windings of the rotor. My paper confirms the equivalent performance between an IPM rotor and wound-field rotor by FEM simulation.
Also in:
  • SAE International Journal of Alternative Powertrains - V126-8EJ
  • SAE International Journal of Alternative Powertrains - V126-8
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