System and method for non-sinusoidal current waveform excitation of electrical generators

摘要

An electrical generator (26) includes a stator (36) having fractional-slot concentrated windings (42) and a rotor having field windings (52). A drive (10) is provided having a circuit (24) to control current flow to the field windings (52) and a controller (28) to input an initial DC field current demand to the circuit (24) to cause the circuit (24) to output an initial DC field current representative of a DC field current demand that would cause an electrical generator (26) having sinusoidal stator (36) windings to output a desired AC power. The controller (28) receives feedback on the magnetic field generated by the initial DC field current, isolates an ideal fundamental component of the magnetic field based on the feedback and to generate a modified DC field current demand, and inputs the modified DC field current demand to the circuit (24), thereby causing the circuit (24) to output an instantaneous non-sinusoidal current to the field windings (52) to generate a sinusoidal rotating air gap magnetic field.