Patent ID: 9588501
Date: 2017-03-07
CPC Classifications: G05B,H02P

Claim:
1. A servomotor control device comprising: an inverter circuit configured to drive a servomotor by converting direct current to alternate current and supplying the alternate current obtained by the conversion to the servomotor; a pulse width modulation circuit configured to output a pulse width modulation signal to the inverter circuit; a cutoff circuit configured to receive a safety signal and the pulse width modulation signal, outputs the pulse width modulation signal to the inverter circuit when the safety signal is turned on, and does not output the pulse width modulation signal to the inverter circuit when the safely signal is turned off; and a servomotor control circuit configured to output the safety signal to the cutoff circuit and receives a monitor signal output from the cutoff circuit, wherein the servomotor control circuit turns off, within one cycle time of the pulse width modulation signal, the safety signal input to the cutoff circuit where the pulse width modulation signal is turned off during servomotor drive and detects an abnormality when an off state is not detected using the monitor signal.