Patent ID: 8264178
Filing Date: 2012-09-11
Classification: H02P

Abstract:
1. A brushless motor control apparatus comprising: a voltage supplying means for supplying a voltage of a rectangular wave from each of a plurality of pairs of switching elements to a corresponding one of a plurality of windings of a brushless motor, wherein the switching elements of each pair are connected with each other in series; a pulse width modulation (PWM) signal generating means for generating and outputting a PWM signal to drive the plurality of pairs of switching elements of the voltage supplying means; a counter that counts down to zero from a maximum value of the PWM signal through a predetermined time period; and a control means for controlling the PWM signal generating means such that the PWM signal generating means generates and outputs a PWM signal, which corresponds to a count value of the counter, for the predetermined time period from timing of changing the voltage of the rectangular wave, which is supplied from the voltage supplying means, to zero.