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

2010-12-28

Benson, Walter (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S799000, C318S800000, C318S437000

Reexamination Certificate

active

07859206

ABSTRACT:
A microcomputer includes a calculating section calculating a d-axis electric current command value and a q-axis electric current command value and a signal generating section. The signal generating section generates a motor control signal through feedback control in a d-q coordinate system based on the d-axis electric current command value and the q-axis electric current command value. The microcomputer also has an anomaly determining section, which detects an anomaly if a failure of electric current flow has occurred in any one of phases of a motor. If the anomaly is detected, the microcomputer produces a motor control signal instructing to use, as electric current flowing phases, two phases other than the phase with the failed electric current flow. At this stage, the microcomputer calculates the d-axis electric current command value in such a manner as to produce the q-axis electric current value corresponding to the q-axis electric current command value except for values at angles corresponding to the phase with the failed electric current flow.

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