Electric machine with continuous pole phase modulation

Details Electric machine with continuous pole phase modulation Electric machine with continuous pole phase modulation

1983-03-24

1984-12-18

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

H02P 748

Patent

active

044892659

ABSTRACT:
A pole phase modulated rotary electric machine is provided with a uniformly slotted stator structure and a main stator winding which spans the entire stator periphery. A control stator winding is wound in selected slots of the stator structure and the average phase change between adjacent slots of the stator structure is controlled by controlling the phase angle of current supplied to the control winding using a rotary magnetic induction phase shifter, an isolated variable reactance load, or a switching arrangement which varies the current amplitude and magnetic field axis of the controlled winding. Pole phase modulation provides a continuously variable magnetic speed control of induction type electrical machines operating at a fixed power frequency.

REFERENCES:
patent: 4152630 (1979-05-01), Wanlass
patent: 4338557 (1982-07-01), Wanlass
Rawcliffe, G. H., "Induction Motors Old and New", Electronics & Power, Jul. 1979, pp. 502-507.

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