Rotary phase converter
AssigneeRonk Electrical Industries, Inc.
InventorClaude M. Hertz
Life of this patent
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Abstract
A self-starting rotary converter for connection to a single-phase a.c. power source and for supplying polyphase current to a polyphase electrical load. A generally annular polyphase stator has a predetermined number of poles and at least three stator windings symmetrically oriented physically and electrically. An induction rotor positioned within the stator rotates about a central axis thereof when the stator is energized by single-phase a.c. power. One of the stator windings has at least one electrical tap positioned intermediate its ends, and a second stator winding has one of its ends connected to the tap to effect electrically nonsymmetrical operation of the stator. This maintains the currents supplied to the phases of the polyphase load at its maximum rating substantially balanced.
Claims7
A self-starting rotary converter for connection to a single-phase a.c. power source and adapted to supply polyphase current to a polyphase electrical load, said converter comprising:
- a generally annular polyphase stator having a predetermined number of poles and at least three stator windings symmetrically oriented physically and electrically, each winding having a substantially equal number of active turns;
- an induction rotor positioned within said stator for rotation about a central axis thereof when the stator is energized by single-phase a.c. power;
- and
- one of said stator windings having at least one electrical tap positioned intermediate the ends thereof, and a second of said stator windings having one end thereof adapted to be connected to said tap to effect electrically nonsymmetrical operation of said stator without changing the number of active turns of any winding whereby the currents supplied to the phases of the polyphase load at its maximum rating are maintained substantially balanced.
Dependencies are inferred from the claim text.