Patent ID: 9118271
Filing Date: 2015-08-25
Classification: H02P

Abstract:
1. A method for generating AC power in an electrical generator including a stator having a plurality of fractional-slot concentrated windings and a rotor having a plurality of field windings, the method comprising: inputting a test DC field current demand to an inverter; generating an initial DC field current in the inverter in response to the test DC field current demand, the initial DC field current being output to the plurality of field windings on the rotor to generate a test rotating magnetic field between the rotor and the stator; detecting characteristics of the test rotating magnetic field generated by the initial DC field current; determining a desired current waveform based on the detected characteristics of the test rotating magnetic field; generating a modified DC field current demand, based on the desired current waveform, to produce the desired current waveform; and inputting the desired current waveform to the inverter, thereby causing the inverter to output a non-sinusoidal AC current waveform to the plurality of field windings on the rotor to generate a sinusoidal rotating magnetic field, thereby generating AC power in the plurality of fractional-slot concentrated windings.