MOTOR SPEED CONTROL SYSTEM, MOTOR CONTROL CIRCUIT, AND MOTOR

摘要

PROBLEM TO BE SOLVED: To provide a full-logic formation-enabled PWM control system in which a PWM cycle can be varied and a duty ratio can be configured according to load operation conditions.;SOLUTION: This system is provided with a PWM fundamental wave generation means 12 for frequency-dividing a fundamental frequency signal to generate a PWM fundamental wave, a PWM frequency setting means 22 for setting the PWM cycle based on the PWM fundamental wave, a duty ratio formation means 24 for forming a duty ratio within the PWM cycle (N/M:N≤M where M represents a maximum clock count), and a PWM control signal outputting means for outputting the PWM control signal with the duty ratio to a load driving circuit.;COPYRIGHT: (C)2009,JPO&INPIT