초록 ▼

A method and apparatus for improving the performance of polyphase AC machine is provided. The machines are excited with both a fundamental frequency and with an odd harmonic of the fundamental frequency so that a fundamental flux wave and an odd harmonic flux wave travel at a synchronized speed with

A method and apparatus for improving the performance of polyphase AC machine is provided. The machines are excited with both a fundamental frequency and with an odd harmonic of the fundamental frequency so that a fundamental flux wave and an odd harmonic flux wave travel at a synchronized speed within the air-gap of the machine. The phase angle between the fundamental and odd harmonic excitation is controlled to increase the magnetic loading of one portion of the machine, while reducing the magnetic loading of the another portion of the machine. In this manner, redistribution of the flux densities is effected to more efficiently use the various components of the machine to increase torque.

대표청구항 ▼

An apparatus for exciting a polyphase alternating current machine having at least one set of stator windings to controllably produce a flux wave of a preselected configuration in an air-gap of said machine, comprising: means for exciting at least a portion of said stator windings with a polyphase fu

An apparatus for exciting a polyphase alternating current machine having at least one set of stator windings to controllably produce a flux wave of a preselected configuration in an air-gap of said machine, comprising: means for exciting at least a portion of said stator windings with a polyphase fundamental frequency current and generating a resultant fundamental flux wave rotating in the air-gap of said machine at a first preselected speed; means for exciting at least a portion of said stator windings with an odd harmonic frequency current of said fundamental frequency current and generating a resultant odd harmonic flux wave rotating in the air-gap of said machine at said first preselected speed; and means for adjusting the phase relationship of said harmonic flux wave relative to said fundamental flux wave to produce a resultant flux wave having a peak amplitude greater than the amplitude of the fundamental flux wave.