US 11,837,979 B2
Electric motor control device and electric power steering apparatus using the same
Masahiko Orii, Tokyo (JP); Isao Kezobo, Tokyo (JP); Tatsuya Mori, Tokyo (JP); and Genki Fujii, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/598,414
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jun. 27, 2019, PCT No. PCT/JP2019/025626
§ 371(c)(1), (2) Date Sep. 27, 2021,
PCT Pub. No. WO2020/217548, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-083633 (JP), filed on Apr. 25, 2019.
Prior Publication US 2022/0181998 A1, Jun. 9, 2022
Int. Cl. H02P 21/00 (2016.01); H02P 21/05 (2006.01); B62D 5/04 (2006.01); H02P 21/06 (2016.01); H02P 27/06 (2006.01)
CPC H02P 21/05 (2013.01) [B62D 5/0463 (2013.01); H02P 21/06 (2013.01); H02P 27/06 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electric motor control device for controlling an electric motor, having saliency, by an inverter of a vector control scheme, the electric motor control device, comprising:
a fundamental electric-current instruction generator for outputting a d-axis fundamental electric-current instruction and a q-axis fundamental electric-current instruction for thereby outputting fundamental torque from the electric motor;
a position dependency component generator for outputting a position dependency component of the electric motor in accordance with a rotational position of the electric motor;
an electric current correction instruction calculator for calculating a d-axis current correction instruction and a q-axis current correction instruction from said d-axis fundamental electric-current instruction and said q-axis fundamental electric-current instruction, and from said position dependency component;
an electric current correction instruction superposition device for generating a d-axis electric current instruction by performing superposition of said d-axis current correction instruction on said d-axis fundamental electric-current instruction, and for generating a q-axis electric current instruction by performing superposition of said q-axis current correction instruction on said q-axis fundamental electric-current instruction; and
an electric current controller for controlling an electric current to flow through the electric motor by way of the inverter, based on the d-axis electric current instruction and the q-axis electric current instruction, wherein
the electric current correction instruction calculator calculates a ratio being determined in advance to become a magnitude of said d-axis current correction instruction and that of said q-axis current correction instruction, and said ratio is preliminarily specified or specified in accordance with a state of the electric motor.