| 摘要 |
PURPOSE:To enable to maintain the output torque constant by variably controlling the supply current to a pulse motor in response to the pulse rate. CONSTITUTION:Drive information of phase in response to the pulse rate read out from an ROM2 is supplied to a motor drive circuit 9 through an interface logic circuit 5, a phase signal control logic circuit 8. Conversion code information corresponding to the supply current command value in response to the pulse rate from the ROM2 is converted by a D/A converter 4 to analog value, and amplified by an amplifier 22. A comparator 12 compares the voltage value Vc in response to the supply current amount and the voltage value Vi in response to the detected current from a current sensor 16, and applies a voltage control signal 15 to the motor drive circuit 9 through diodes D1-D4 in response to the result. |
