Motor controller and electric power steering apparatus

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

2008-02-01

2010-10-12

Ro, Bentsu (Department: 2837)

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

C318S400020, C318S432000, C318S434000

Reexamination Certificate

active

07813626

ABSTRACT:
A microcomputer (an electric current command value calculating section) carries out field weakening control in which a d-axis electric current command value Id* is set to a negative value in correspondence with rotation angular velocity ω of a motor. The microcomputer determines whether an anomaly has occurred in an EPS. If it is determined that an anomaly is in a power supply system (step202: YES), the microcomputer determines whether the anomaly in the power supply system is failure of electric current flow in any phase (step203). If it is determined that electric current flow has failed in a certain phase, the microcomputer prohibits the field weakening control and outputs a motor control signal instructing to use two other phases free from the failure of electric current flow as electric current flowing phases (two phase drive mode, step204).

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