US 11,916,506 B2
Motor control device
Yusaku Kawaguchi, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Jul. 12, 2022, as Appl. No. 17/862,750.
Claims priority of application No. 2021-116263 (JP), filed on Jul. 14, 2021.
Prior Publication US 2023/0029149 A1, Jan. 26, 2023
Int. Cl. H02P 29/024 (2016.01); H02P 27/06 (2006.01)
CPC H02P 29/024 (2013.01) [H02P 27/06 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A motor control device, comprising:
a motor having a multi-phase motor winding;
a drive circuit having drive elements corresponding to each phase of the motor winding and provided on either a low potential side or a high potential side of the motor winding;
a current detection unit having current detection resistors corresponding to each phase of the motor winding, and provided on a low potential side of the drive circuit provided on the low potential side of the motor winding, or on a high potential side of the drive circuit provided on the high potential side of the motor winding; and
a control unit having an actuator control unit configured to control a drive of the motor by controlling an on/off operation of the drive element, and an abnormality diagnosis unit configured to diagnose an abnormality in the current detection unit,
wherein
the abnormality diagnosis unit determines that the current detection unit is abnormal when a difference between a maximum value and a minimum value of a phase current when a same duty ratio is commanded to each phase is equal to or more than an abnormality determination threshold value;
the motor control device further comprises a reflux circuit having reflux elements provided corresponding to each phase of the drive elements,
one end of the motor winding is connected to the drive element, and the other end is connected by a connection portion, and
one end of the reflux element is connected to a connecting part between the drive element and the motor winding, and the other end is connected to the connection portion.