Balanced and synchronized phase detector for an AC induction mot

Details Balanced and synchronized phase detector for an AC induction mot Balanced and synchronized phase detector for an AC induction mot

1997-01-21

1998-10-13

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318437, 318811, H02P 7628

Patent

active

058217266

ABSTRACT:
A balanced and synchronized phased detector circuit is provided for a three phase power controller for AC induction motors. The power controller includes a thyristor or switching element for each motor phase winding between a line phase terminal of a three power line and the motor's input terminals, and decides the sequence for firing the thyristors. The phase detector includes a dividing resistor network between each phase's line terminal and the front-end operational amplifiers used in the phase detector, and an adjustable dividing resistor network between each motor terminal and the front-end operational amplifiers. The resistor networks allow a differential voltage to be set between the phase line terminal and the motor terminal for each phase, to a voltage appropriate for firing the respective thyristor. By allowing control over the front-end differential voltage, the phase detector virtually elements vibrations encountered during operation of the motor.

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patent: 5140243 (1992-08-01), Lyons et al.
patent: 5241256 (1993-08-01), Hatanaka et al.

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