Pole-amplitude modulation pole-changing electric motors and gene

Details Pole-amplitude modulation pole-changing electric motors and gene Pole-amplitude modulation pole-changing electric motors and gene

1979-03-19

1981-04-07

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310198, 318773, H02K 300

Patent

active

042609232

ABSTRACT:
The invention provides improved stator windings for pole-amplitude modulation (P.A.M.) pole-changing electric motors and generators. In large machine 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 content, whereby the adjacent harmonic m.m.f. content may be reduced for both alternative pole-numbers.

REFERENCES:
patent: 3175142 (1965-03-01), Rawcliffe
patent: 3949253 (1976-04-01), Broadway
patent: 4013909 (1977-03-01), Broadway
patent: 4127787 (1978-11-01), Auinger
patent: 4144470 (1979-03-01), Auinger
patent: 4158788 (1979-06-01), Godwin

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