Controller with two modes of braking induction motors

Details Controller with two modes of braking induction motors Controller with two modes of braking induction motors

1986-05-14

1987-12-08

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Braking

318763, 318809, H02P 320, H02P 540

Patent

active

047120541

ABSTRACT:
To a controller utilizing thyristors have been added delayed resetting circuits connected to timing circuits for enabling delayed firing, and also circuits for inverting polarity of error signal in order to accommodate regenerative and reverse-plug braking. Other additional circuits include circuits for controlling a ramp generator for developing different segments of a ramp required for different modes of operation of a motor. Sequence switching circuits in the circuits controlling operation of the motor determine that full acceleration or deceleration of a selected mode is completed before a newly selected mode is started. For smooth starting and stopping of elevators, a curve-shaping circuit succeeding the ramp generator gradually changes the slope at the very ends of a selected segment of the ramp, and a brake control circuit having an input connected to the motor and output switching circuits for controlling disconnection of the motor and application of holding brakes, synchronizes disconnection of the motor and application of mechanical brakes when the motor ceases rotation.

REFERENCES:
patent: 4042069 (1977-08-01), Ohira et al.
patent: 4207508 (1980-06-01), Habisohn
patent: 4311949 (1982-01-01), Pelkmann et al.
patent: 4319665 (1982-03-01), Komuro et al.
patent: 4355704 (1982-10-01), Makinen
patent: 4483419 (1984-11-01), Salihi et al.
patent: 4501343 (1985-02-01), Salihi
patent: 4503937 (1985-03-01), Cevenec et al.

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