DYNAMIC BRAKING DEVICE FOR INDEPENDENTLY EXCITED DC MOTOR

FIELD: electrical engineering; dynamic braking of dc drive motors for various industries. SUBSTANCE: device has controllable rectifier which is controlled by means of error signal coming from automatic brake acceleration regulating system of motor; filter; motor independently excited winding; contactor with one closing and one opening contacts; STOP button whose first lead is connected to one of phase leads of ac voltage supply and its second phase lead, to first lead of contactor coil through START button and contactor closing contact parallel-connected to STOP button, second lead of contactor coil being connected to second phase lead of ac voltage supply; speed-induced voltage sensor; electric motor; master unit whose output is connected to first input of comparison unit; output of speed-induced voltage sensor is connected through differentiating unit to second input of comparison unit whose output is connected to input of comparison unit whose output is connected to input of controllable rectifier; dc voltage supply is connected to armature winding of independently excited motor through first and second additional closing contacts of contactor. EFFECT: enhanced braking precision and operating reliability of device. 1 cl, 1 dwg