Position control device for servomotor

Details Position control device for servomotor Position control device for servomotor

1994-03-30

1995-05-23

Ip, Paul

Electricity: motive power systems

Positional servo systems

318561, 31856811, 318610, 318618, F15B 900

Patent

active

054184401

ABSTRACT:
A position control device for a servomotor in use of a NC machine tool, a robot or the like detects a case that a control shaft is collided with something in error to stop the servomotor at a high speed so as to minimize damages of the machine. When an estimated disturbance torque estimated by a disturbance torque observer 9 is over an allowance disturbance torque, an alarm signal is outputted. At this point, a plugging control unit 11 outputs a braking torque current command in a direction of stopping the servomotor until the servomotor 5 is stopped. An operation mode determination unit 12 receives an operation mode of the machine during the operation to set the allowance disturbance torque corresponding to the operation mode to the determination unit 10. According to the present invention, the detection of the collision of the machine 6 can be performed at higher speed and a braking distance after the detection so that damages of the machine during the motor rotates at a high speed can be minimized.

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