Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Patent
1991-09-30
1994-05-24
Shoop, Jr., William M.
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
318705, 318714, H02P 146
Patent
active
053152255
ABSTRACT:
A converter for synchronous motor starting rectifies the input voltage from a polyphase input power source to develop a starting current having a substantial DC component. The starting current is then sequentially applied to each of the phase windings in the synchronous motor, with the sequential rate of application occurring at a continuously increasing frequency. The angular velocity of the motor synchronously increases with the increasing frequency of the sequential rate of application of the starting current to the phase windings. By application of the starting current at an increasing frequency, the synchronous motor operates in a forced commutation mode. The starting current is removed when the angular velocity of the motor is synchronous with the constant frequency of the polyphase input power source. When the starting current is removed, and the motor is synchronous with the input power, the input power may then be applied directly to the motor in a natural commutation mode.
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Heinrich Theodore M.
Schauder Colin D.
Cabeca John W.
Electric Power Research Institute
Shoop Jr. William M.
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