Electric motor controller and electric motor controller for vehicle steering apparatus

Abstract

The present invention provides an electric motor controller and an electric motor controller for vehicle steering apparatus. The electric motor controller comprises a current drive unit driving the motor based on an axis current value in a rotating coordinate system that rotates in accordance with a control angle that is a rotational angle used in a control, an addition angle calculation unit calculating an addition angle that is added to the control angle, a control angle calculation unit obtaining a current value of the control angle by adding the addition angle to an immediately preceding value of the control angle in each predetermined calculation cycle, a torque detection unit detecting a torque that is applied to a motor driven member except a motor torque, a changing unit changing a parameter for controlling the electric motor in accordance with a detected torque that is detected by the torque detection unit, and a suspending unit suspending the operation of the changing unit, until an absolute value of the detected torque becomes equal to or smaller than a predetermined value.

Description

[0001] The entire contents of Japanese Patent Application No. 2009-019976 filed on January 30, 2009 are incorporated herein by reference. technical field [0002] The present invention relates to a motor control device for driving a brushless motor and a motor control device for a vehicle steering device. Background technique [0003] A brushless motor can be used, for example, as a driving source of a steering device for a vehicle. An example of a steering device for a vehicle is an electric power steering device. A motor control device for driving and controlling a brushless motor is generally configured to control the supply of motor current based on the output of a rotation angle sensor for detecting the rotation angle of a rotor. As the rotation angle sensor, a resolver that outputs a sine wave signal and a cosine wave signal corresponding to the rotor rotation angle (electrical angle) is generally used. However, the resolver is expensive, has a large number of wires,...

AI Technical Summary

Problems solved by technology

However, the resolver is expensive, the number of wiring is large, and the installation space is large

Therefore, there is a problem of hindering cost reduction and miniaturization of devices having brushless motors

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