Motor controller and electric power steering apparatus
First Claim
1. A motor controller having signal generating means that generates a motor control signal by performing an electric current feedback control in a d-q coordinate system, and a driver circuit that supplies a drive power of three phases to a motor based on the motor control signal, the motor controller comprising:
- memory means that stores a resistance value of each one of the phases of the motor,wherein the signal generating means corrects respective voltage command values of the d-q coordinate system based on the stored resistance values in such a manner as to suppress a torque ripple caused by a difference among the resistance values.
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Accused Products
Abstract
A signal generating section includes a second calculating section that corrects phase resistance. The calculating section stores resistance values of phases that have been measured in advance and a reference resistance value. The calculating section calculates correction components, which cancel a voltage drop term of a voltage equation of a d-q coordinate system changing depending on the rotation angle of the motor, based on the stored resistance values and the reference resistance value. The signal generating section superimposes the correction component and the correction component on a d-axis voltage command value and a q-axis voltage command value, respectively. The d-axis voltage command value and the q-axis voltage command value are thus corrected in such a manner as to suppress a torque ripple caused by difference among the resistance values of the phases.
46 Citations
4 Claims
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1. A motor controller having signal generating means that generates a motor control signal by performing an electric current feedback control in a d-q coordinate system, and a driver circuit that supplies a drive power of three phases to a motor based on the motor control signal, the motor controller comprising:
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memory means that stores a resistance value of each one of the phases of the motor, wherein the signal generating means corrects respective voltage command values of the d-q coordinate system based on the stored resistance values in such a manner as to suppress a torque ripple caused by a difference among the resistance values. - View Dependent Claims (2, 3, 4)
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Specification