Patent ID: 9397543
Filing Date: 2016-07-19
CPC Classification: H02K,H02P

Claim Text:
1. An electromagnetic machine, comprising: a first stator winding having a first number of pole pairs; a second stator winding having a second number of pole pairs which is different to the first number of pole pairs, wherein the first and second stator windings are fixed relative to each other; and a modulator having a plurality of high magnetic permeability pole pieces arranged relative to the first and second stator winding so as to modulate electromagnetic fields produced by the first and second stator windings, thereby matching harmonic spectra of the first and second stator windings, wherein each of the modulator and either the first or second stator winding has a back iron portion such that the modulator and the first and second stator windings are located within the back iron of the modulator and the back iron of the first or second stator winding thereby providing a magnetic envelope for the modulated electromagnetic fields, and wherein: either the first or second stator winding is positioned between the other of the first or second stator winding and the modulator, the modulator is rotatable and the first and second stator winding are stationary relative to each other and the modulator, and the modulator is positioned adjacent to one side of either the first or the second stator winding.