Patent ID: 9236829
Filing Date: 2016-01-12
CPC Classification: B25B,F16P,G01R,H02P

Claim Text:
1. A motor driving circuit for driving a motor, comprising: a detecting circuit configured to detect a detection signal indicative of a current state of the motor; a command value generating unit configured to generate a command value indicative of a target state of the motor; an error amplifier configured to generate an error signal by amplifying an error between the detection signal and the command value; a pulse width modulator configured to generate a pulse signal having a duty cycle corresponding to the error signal; and an output circuit configured to apply a switching voltage having a duty cycle corresponding to the pulse signal across the motor, wherein the command value generating unit is configured to provide a variation to the command value, wherein the command value generating unit includes: wherein the set voltage generating part is configured to provide a variation to the set voltage, and wherein the set voltage generating part modulates the set voltage with a predetermined frequency.