US 12,395,108 B2
Motor drive device and electric vehicle system
Noriya Nakao, Tokyo (JP); Shun Taniguchi, Tokyo (JP); Toshiyuki Ajima, Tokyo (JP); and Keiji Kadota, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 18/277,117
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Aug. 31, 2021, PCT No. PCT/JP2021/032026
§ 371(c)(1), (2) Date Aug. 14, 2023,
PCT Pub. No. WO2022/180895, PCT Pub. Date Sep. 1, 2022.
Claims priority of application No. 2021-028016 (JP), filed on Feb. 24, 2021.
Prior Publication US 2024/0128908 A1, Apr. 18, 2024
Int. Cl. H02P 21/00 (2016.01); B60K 1/00 (2006.01); B60L 15/20 (2006.01); H02P 21/22 (2016.01)
CPC H02P 21/22 (2016.02) [B60K 1/00 (2013.01); B60L 15/20 (2013.01); B60L 2240/423 (2013.01); B60L 2240/427 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A motor drive device that controls torque generated by a motor, based on a d-axis current and a q-axis current, to drive the motor, the motor drive device comprising:
a d-axis current instruction generating unit that calculates a first d-axis current instruction;
a current instruction correcting unit that generates a positive correction quantity that is added to the first d-axis current instruction when a voltage across terminals of the motor is equal to or larger than a given value; and
a voltage feedback control unit that generates a negative correction quantity that is added to the first d-axis current instruction to prevent the voltage across the terminals of the motor from exceeding a given maximum output voltage, wherein
the motor drive device controls the torque, based on a second d-axis current instruction created by adding the positive correction quantity and the negative correction quantity to the first d-axis current instruction and on a q-axis current instruction.