US 12,283,906 B2
Motor control device
Ryou Morihashi, Yamanashi (JP); and Satoshi Ikai, Yamanashi (JP)
Assigned to FANUC CORPORATION, Yamanashi (JP)
Appl. No. 18/272,212
Filed by FANUC CORPORATION, Yamanashi (JP)
PCT Filed Feb. 3, 2022, PCT No. PCT/JP2022/004309
§ 371(c)(1), (2) Date Jul. 13, 2023,
PCT Pub. No. WO2022/172859, PCT Pub. Date Aug. 18, 2022.
Claims priority of application No. 2021-020144 (JP), filed on Feb. 10, 2021.
Prior Publication US 2024/0088820 A1, Mar. 14, 2024
Int. Cl. G05B 19/4155 (2006.01); H02P 6/16 (2016.01); H02P 29/028 (2016.01); H02P 29/032 (2016.01)
CPC H02P 29/028 (2013.01) [H02P 6/16 (2013.01); H02P 29/032 (2016.02)] 5 Claims
OG exemplary drawing
 
1. A motor control device for controlling a motor of a machine tool, robot or industrial machine,
the motor control device comprising a controller,
wherein the controller includes:
a first abnormality detector which detects abnormality in a separate position detector serving as a detector, or a feedback cable connected to the separate position detector;
a second abnormality detector which detects abnormality in a rotary encoder of a motor serving as a detector, or a feedback cable connected to the rotary encoder; and
a switching unit which switches from full-closed control to semi-closed control or control only by the separate position detector,
wherein the switching unit, when detecting abnormality in any of the first abnormality detector or the second abnormality detector, switches to control which uses only either of the detectors for which abnormality is not detected.