Rotatable transformer field excitation system for variable speed

Details Rotatable transformer field excitation system for variable speed Rotatable transformer field excitation system for variable speed

1978-03-24

1980-12-09

Rubinson, Gene Z.

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

318712, 318721, H02P 736

Patent

active

042387191

ABSTRACT:
A rotatable transformer field excitation system for an armature converter-fed variable speed self-controlled brushless polyphase synchronous motor wherein the armature converter is energized from an alternating current voltage source having one or more phases, and wherein the motor includes a rotor having a wound field winding and a rectifier circuit mounted on the rotor and rotatable therewith to energize the field winding with direct current from the rectifier circuit, and wherein the rotatable transformer includes a primary winding having a number of phases equal to the phases of the alternating current voltage source and having a plurality of coils located in slots on the inner periphery of and defining at least two poles of a rotatable transformer stator, the slots being spaced a predetermined distance from the center of the rotor axis, and a separate rotatable secondary winding, the number of phases of which equals the phases of the rotatable transformer, the secondary winding being formed by a plurality of coils mounted in slots on the outer periphery of the rotor and having the same number of poles as the stator and being electrically connected to the rectifier circuit to produce a direct current to energize the field winding, the rotatable transformer electrical characteristics being selected to have a magnetizing reactance which is greater than the equivalent load resistance presented to the rotatable transformer secondary winding by the rotating rectifier, and an electrical circuit connected between the alternating current source and the armature converter and to the rotatable transformer primary winding to energize the rotatable transformer primary winding with a voltage and current derived from the constant voltage of the alternating current source and from the variable current into the armature converter resulting in a current in the rotatable transformer secondary winding having a magnitude which is substantially independent of variations in motor speed is shown.

REFERENCES:
patent: 3210644 (1965-10-01), Sparrow
patent: 3461368 (1969-08-01), Haller
patent: 3462669 (1969-08-01), Picozzi
patent: 3866099 (1975-02-01), Bourbeau
patent: 4047095 (1977-09-01), Wijnterp

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