Motor brush structure and motor-driven power steering device using the same motor

Abstract

To present a motor brush structure capable of decreasing the current ripple and torque ripple substantially while minimizing the cost increase, and, by using the same motor, a motor-driven power steering device capable of suppressing generation of working sound, magnetostriction sound, radio noise, and cogging feel during steering operation. In a motor-driven power steering device used as a steering device for turning wheels such as front wheels of an automobile, a pair of shunt brushes for shunting are added to a pair of main brushes, these shunt brushes are disposed at positions for geometrically inverting the brush contact positions with segments, and it is composed so that the waveforms of the current flowing in the main brushes 11 from each segment of a commutator to each coil, the current into the shunt brushes, and the shunted current may be mutually inverted in phase to cancel each other.

Dependencies are inferred from the claim text.