Pole-amplitude modulation, pole-changing electric motors and...

Details Pole-amplitude modulation, pole-changing electric motors and... Pole-amplitude modulation, pole-changing electric motors and...

H - Electricity

02

K

310/112

H02K 3/00 (2006.01) H02K 3/28 (2006.01) H02K 17/14 (2006.01)

Patent

CA 1121436

Abstract The invention provides improved stator windings for pole-amplitude modulation (P.A.M.), pole-changing electric motors and generators, using symmetrical pole-combinations. In large machines of high pole-numbers, the effect of adjacent harmonics of m.m.f waveform becomes evident in the form of low-frequency vibration of the frame. In small machines the effect, although present, is less important. The invention provides stator windings, particularly for large machines, wherein the phase-winding coil grouping, selected primarily for sinusoidal modulation, is selected secondarily to include a third-harmonic modulation content, whereby the adjacent harmonic m.m.f. content is reduced for both alternative pole-numbers.

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