Method and apparatus for controlling the operation of synchronou

Electricity: motive power systems – With flywheel or massive rotary member

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318171, 318174, 318175, 318178, H02P 146

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active

040126790

ABSTRACT:
A method and an apparatus for controlling the operation of the synchronous motor are disclosed in which the synchronous motor is started with a starting power supply and operated with a steadying power supply. The starting power supply is adapted to alternately repeat acceleration and deceleration of the synchronous motor in the neighborhood of the frequency thereby to bring the synchronous motor into the point where the synchronous motor is in synchronism with the steadying power supply. The starting power supply comprises a current control circuit and a phase angle control circuit, which circuits control the motor current in such a manner as to prevent the voltage drop due to the synchronous reactance of the motor from exceeding the induced voltage of the motor, while at the same time controlling the power factor angle to be in the range from a lead 90.degree. to the angle corresponding to a maximum output point produced by said motor current.

REFERENCES:
patent: 2852726 (1958-09-01), Ocnaschek
patent: 3307092 (1967-02-01), Trocchio
patent: 3388305 (1968-06-01), Smith
patent: 3896351 (1975-07-01), Blaschke

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