US 12,244,251 B2
Motor drive device, motor driving method, and non-transitory computer readable medium
Masaki Hirakata, Hino (JP)
Assigned to FUJI ELECTRIC CO., LTD., Kanagawa (JP)
Filed by FUJI ELECTRIC CO., LTD., Kawasaki (JP)
Filed on Jan. 23, 2023, as Appl. No. 18/158,428.
Claims priority of application No. 2022-054951 (JP), filed on Mar. 30, 2022.
Prior Publication US 2023/0353076 A1, Nov. 2, 2023
Int. Cl. H02P 21/22 (2016.01); H02P 5/50 (2016.01)
CPC H02P 21/22 (2016.02) [H02P 5/50 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A motor drive device comprising:
a first drive unit configured to drive a plurality of first motor phases included in a first motor;
a second drive unit configured to drive a plurality of second motor phases included in a second motor;
a common sensor configured to detect a total current flowing through a phase pair obtained by selecting one phase from the plurality of first motor phases and one phase from the plurality of second motor phases;
at least one first motor phase sensor configured to detect each current flowing through each phase not included in the phase pair among the plurality of first motor phases;
at least one second motor phase sensor configured to detect each current flowing through each phase not included in the phase pair among the plurality of second motor phases; and
a drive control unit configured to control drive amounts of the first drive unit and the second drive unit for the plurality of first motor phases and the plurality of second motor phases by using respective current detection values of the common sensor, the at least one first motor phase sensor, and the at least one second motor phase sensor, wherein
the drive control unit includes a failure detection unit configured to detect a failure of any sensor in response to a total current amount of flowing into the first motor and the second motor being outside a predetermined error range from 0, the total current amount being calculated by using respective current detection values of the common sensor, the at least one first motor phase sensor, and the at least one second motor phase sensor, wherein
in a winding short-circuit state, the first motor and the second motor allow respective phase currents with a difference falling within a predetermined error range to flow, the difference being a difference in magnitude between a first current vector and a second current vector obtained by converting respective phase currents, and
the drive control unit includes a common sensor failure identification unit configured to identify a failure of the common sensor in response to a fact that it is detected that the any sensor of the common sensor, the at least one first motor phase sensor, and the at least one second motor phase sensor has failed, and the difference in magnitude between the first current vector calculated by using a current detection value of the at least one first motor phase sensor and the second current vector calculated by using a current detection value of the at least one second motor phase sensor is within the predetermined error range in a winding short-circuit state of the first motor and the second motor.