Motor controller and electric power steering apparatus

Details Motor controller and electric power steering apparatus Motor controller and electric power steering apparatus

2008-02-25

2010-11-30

Benson, Walter (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400150, C318S400230, C318S432000, C318S638000

Reexamination Certificate

active

07843154

ABSTRACT:
A second computing section executing a compensation control is provided with a third computing section computing a d-axis correction amount, and a fourth computing section computing a q-axis correction amount. The respective computing sections compute a d-axis correction amount and a q-axis correction amount on the basis of an arithmetic expression constituted by a first term obtained by multiplying a correction coefficient relating to an object axis by a q-axis current command value and a second term obtained by multiplying a correction coefficient relating to an auxiliary axis by a d-axis current command value. The second computing section computes a d-axis current command value and a q-axis current command value which do not generate a torque ripple caused by a distortion of an induced voltage waveform, by adding the d-axis correction amount and the q-axis correction amount to the d-axis current command value and the q-axis current command value.

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