Patent ID: 7129667
Filing Date: 2006-10-31
Classification: G11B,H02P

Abstract:
1. A motor controller for simultaneously controlling operations of at least two system motors by pulse-width modulation, comprising: a pair of switches for supplying driving power to a pair of system motors among said at least two system motors, respectively; a pair of pulse signal generators for generating a pair of pulse signals respectively having predetermined duty ratios at predetermined cycles, and outputting said pulse signals to said pair of switches to turn on or off said pair of switches; and inversion means for inverting a phase of an input signal to one of said pair of pulse signal generators, such that a phase of one of said pair of pulse signals that is generated and output by one of said pair of pulse signal generators is phase shifted by 180 degrees with respect to a phase of a pulse signal generated and output by the other of said pair of pulse signal generators.