| 摘要 |
PURPOSE:To enable to control the rotating speed of a motor to the variations in a voltage of a power source and a load constantly by applying the storage energy of an inductance coil and the superposed energy of stored charge of a capacitor intermittently to a resistance bridge circuit which contains the DC motor at its one side. CONSTITUTION:When a current is supplied from a DC power source 1, a current control transistor 4, a switching transistor 7 become ON or OFF in a period in response to the capacity of an inductance coil 2 and a capacitor 3. The stored energy of the coil 2 and the stored charge of the capacitor 3 are discharged by this switching, and stepwise voltage is applied to a bridge circuit which has a DC motor 19, and resistors 14-16. When the applied voltage becomes excessive or when the rotating speed of the motor 19 increases, a control transistor 8 becomes ON, and a switching operation stops. |
