| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor rotation control device that can control an applied voltage by means of an existing motor driver when implementing rotation control using a reverse voltage of a motor. <P>SOLUTION: The motor rotation control device includes a bridge circuit 1, a motor drive circuit 2, a differential voltage detection circuit 3, and a voltage control circuit 4. The bridge circuit 1 has resistances on three sides, respectively, and has a DC motor on one side. The motor drive circuit 2 applies a DC voltage to a series connection of the DC motor M and the first resistance Rs. The differential voltage detection circuit 3 detects a differential voltage Eb of a junction VM of the DC motor and the first resistance and a junction E1 of the second resistance and the third resistance. A reference voltage command section 41 of the voltage control circuit outputs a reference voltage Vctl determined by a target rotational frequency Nm. A voltage subtraction section 42 subtracts the absolute value of the differential voltage from the reference voltage. A PWM signal based on the resultant voltage is generated, and the motor drive circuit 2 supplies a DC voltage Vcc depending on the duty ratio of the PWM signal to the bridge circuit 1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
