| 摘要 |
PURPOSE:To prevent a motor from burning or disconnecting by stopping the energization of the motor when the state that the voltage or one end of a resistor connected in series with the motor becomes the prescribed value or higher or lower continues for the prescribed time or longer. CONSTITUTION:When a switch 21 is closed, transistors 29, 31 are turned ON, and a motor 38 is normally turned. When the rotating speed of the motor 38 is decelerated in this state, the potential of one end (a) of a resistor 40 connected in series with the motor 38 rises, and the output of a comparator 53 becomes H. When the output of the comparator 53 becomes H for the prescribed time or longer, transistors 29, 31 become OFF. When a switch 22 is closed, transistors 32, 34 are turned ON, and the motor 38 is reversely rotated. When the motor 38 is decelerated in this state, the potential at the point (a) decreases, and the output of the comparator 53 becomes H. When the output of the comparator 57 becomes H for the prescribed time or longer, the transistors 32, 34 become OFF. |
