Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Patent
1993-07-27
1995-12-12
Cabeca, John W.
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
318706, 363 50, 363 55, 361 71, H02P 146
Patent
active
054752922
ABSTRACT:
An apparatus for restarting an inverter after momentary interruption by detecting a power restoration after a momentary outage of a power supply that supplies power to the inverter for driving a synchronous motor. The apparatus includes a frequency detecting portion that detects the frequency of a terminal voltage of the synchronous motor, a phase difference detector that detects the phase difference between the terminal voltage of the synchronous motor and the output voltage command value of the inverter, a phase controller that performs synchronous control so that the frequency and phase of the output voltage command value of the inverter and those of the terminal voltage of the synchronous motor agree with each other, and a restarting portion that restarts the inverter under the condition that the synchronization has been completed after the power restoration of the power supply. This makes it possible to reduce the restarting time after a momentary interruption of the power supply, and to reduce the rush current at the restarting, and the capacity of the inverter.
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Ishii Shin'ichi
Nakanishi Takashi
Cabeca John W.
Fuji Electric & Co., Ltd.
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