| 摘要 |
PURPOSE:To realize speed control with a simple constitution by providing a speed setting means for setting the rotational speed of motor, a motor speed detecting means, and a switching means for switching between the signals from both means and a set torque signal and additionally providing the pulse width control function of a driving circuit with a speed control function. CONSTITUTION:Analog switch output from a switch 13 is set to be a speed detection signal prior to seating and a motor is driven at a speed equal to the value of a speed setting volume 18. A CPU 7 turns a switching means, i.e., analog switches 16, 17, to current detecting side upon seating thus operating a constant current control circuit 4 so that an externally set torque level is achieved. The sequence is controlled according to a command fed from the CPU 7. In other words, a torque control PWM circuit is applied, as it is, in speed control by taking advantage of the operational difference before and after seating thus realizing a speed control circuit by additionally providing a simple switching circuit and a simple program and facilitating the work. |
