CPC H02P 21/05 (2013.01) [B62D 5/0463 (2013.01); H02P 21/06 (2013.01); H02P 27/06 (2013.01)] | 16 Claims |
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.
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