US 12,132,436 B2
Stepping motor abnormality detecting device
Jumpei Niwa, Nara (JP); Yoshio Horiike, Osaka (JP); Koichi Toyota, Nara (JP); and Yukihiro Omoto, Nara (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/997,735
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Jun. 18, 2021, PCT No. PCT/JP2021/023143
§ 371(c)(1), (2) Date Nov. 1, 2022,
PCT Pub. No. WO2021/261387, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 2020-109221 (JP), filed on Jun. 25, 2020.
Prior Publication US 2023/0198433 A1, Jun. 22, 2023
Int. Cl. H02P 8/38 (2006.01); H02P 8/12 (2006.01)
CPC H02P 8/38 (2013.01) [H02P 8/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A stepping motor abnormality detecting device comprising:
a stepping motor driver configured to output a drive pulse for driving a stepping motor;
a power supply configured to supply power to the stepping motor driver;
a current level detector configured to detect a current level of current flowing in the stepping motor driver; and
a determiner configured to determine whether or not the stepping motor is in a normal operation state by comparing the current level detected by the current level detector with a determination threshold predetermined based on a current level when the stepping motor operates normally, wherein
the current level detector includes a power supply impedance estimator that estimates power supply impedance of the power supply, and the determination threshold or the current level is corrected based on the power supply impedance estimated.