AC machine system with induced DC field

Details AC machine system with induced DC field AC machine system with induced DC field

1989-09-14

1991-04-30

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310162, H02K 1902

Patent

active

050121480

ABSTRACT:
An AC machine system, in which the machine has an auxiliary rotating magnetic field, in addition to the main rotating field, with different speeds of rotation. The auxiliary field serves to induce AC voltages in the rotor windings, even when the machine is rotating at the synchronous speed of the main field. The induced AC is rectified, by having a rectifier circuit on the rotor, and provides DC excitation, to create fixed magnetic poles on the rotor. Thereby the machine functions at the synchronous speed of the main field, without the need for a DC exciting source, external to the rotor circuit. The presence of AC current components in the rotor coils, enable torque production at non-synchronous speeds also. The combination of main and auxiliary rotating fields can be implemented in several ways, such as a stator supply having more than one frequency components, or components of opposite sequence. It can also be done by appropriate design of the stator circuit.

REFERENCES:
patent: 4246506 (1981-01-01), Vartanian et al.
patent: 4289989 (1981-09-01), Schibline
patent: 4628245 (1986-12-01), Quayle
patent: 4835431 (1989-05-01), Lindgren

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