| 摘要 |
PROBLEM TO BE SOLVED: To enable stable control for a motor which has a small inertia moment or when sampling interval of rotating speed cannot be reduced without the reduction in a starting torque, by controlling torque ripples with a more simplified circuit and for number of external parts. SOLUTION: A control input voltage Vc to be impressed to a control input terminal 711 is inputted to non-inverted input terminals of preamplifiers 710, 720 connecting the reference voltages Vt1, Vt2 which are generated by dividing a circuit power supply voltage Vcc with resistors 23, 35, 24. Respective output currents I2, I3 are inputted to a resistor 22, and it is then compared with a voltage generated in a resistor 21 by a motor current Im of a DC motor 40 with an error amplifier 800. An output current of the error amplifier 800 is inputted to the base of the transistor 30 for controlling the motor current Im of the DC motor 40 connected to the collector of transistor 30 by means of a control input voltage Vc. |
