| 摘要 |
PURPOSE:To organize a motor speed control circuit into a simplified circuit structure by the use of a CPU, by detecting the rotating speed and by measuring the time of waveform in integral multiples of the pulse. CONSTITUTION:A motor speed control device has a motor 1, a detecting means 2, a measuring means 3 and a control means 4, in which with the detecting means 2 the rotating speed of the motor 1 is detected as the change of a frequency response of pulse, with the measuring means 3 the time of waveform in integral multiples on high level or low level of pulse is measured. And with the control means 4 the measured value obtained by the measuring means 3 is compared with the set value. When the measured value is lower than the set value, the motor 1 is not driven for the next time. However, when the measured value is higher than the set value, the motor is driven accordingly. |
