| 摘要 |
PROBLEM TO BE SOLVED: To enable stable rotary velocity control of a DC motor by changing the charging velocity of charging voltage, due to an inverse electromotive force to set the off a time utilizing this inverse electromotive force which is generated during the off time of motor. SOLUTION: This control circuit consists of a switching element FET to turn on and off a DC motor M, a first charging voltage V10 connected in series to the DC motor M to start the charging when the switching element FET is off, a first threshold value voltage V11 preset depending on the control of rotary velocity of the DC motor M, a second charging voltage V14 for starting the charging, when the switching element FET is on and a second threshold value voltage consisting of the voltage value of a predetermined level. When the switching element FET is off, the switching element FET is turned on, when the charging voltage of the first charging voltage reaches the first threshold value voltage. When the switching element FET is on, the control is performed to turn off the switching element FET when the second charging voltage reaches the second threshold value. |
