DEVICE FOR DYNAMIC BRAKING OF THREE-PHASE INDUCTION MOTOR Russian patent published in 2004 - IPC

FIELD: electric drive dynamic braking in various industries.

SUBSTANCE: proposed device has contactor incorporating coil with four make and one break contacts, STOP button, START button, controlled rectifier, speed-induced voltage sensor, and limiting amplifier. Novelty is introduction of differentiating unit, setting unit, comparison unit, and mentioned rectifier control unit; output of start-induced voltage sensor is connected through break contact of contactor to input of differentiating unit whose output is connected to first input of comparison unit; limiting amplifier output is connected to input of setting unit whose output is connected to second input of comparison unit; output of the latter is connected through rectifier control unit to control input of controlled rectifier.

EFFECT: enhanced braking precision and operating reliability of device.

1 cl, 1 dwg