| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor starting system where motor driving torque becomes constant even if power voltage changes. <P>SOLUTION: Prescribed power voltage is applied to a motor driver part, and an output signal is outputted and supplied from a speed control signal generating part for generating speed control voltage which is inversely proportional to power voltage as an I/F signal. A speed control signal selector part switches the signal to the speed control signal inputted from outside after a motor is started with the speed control signal generating part for generating the speed control signal corresponding to power voltage until the motor is completely started. The speed control signal is supplied to a comparator as control voltage for PWM conversion with a sawtooth wave and is supplied to the motor driver part as power which is inversely proportional to power voltage. The motor driver part feeds back a motor starting recognition signal being an inner signal to the speed control signal selector part. When the motor is judged to be completely started, the speed control signal selector part controls motor rotation speed by speed control voltage from outside. <P>COPYRIGHT: (C)2008,JPO&INPIT |
