| 摘要 |
PURPOSE:To stably control the rotating speed of a DC motor by controlling the speed by a unipolar variable voltage bidirectionally and linearly. CONSTITUTION:A bed feeding mechanism 200 is driven by a DC motor 30. The motor 30 is driven by a bidirectional drive circuit 100 with a speed servo. When a unipolar speed control voltage Va input to the circuit 10 becomes the prescribed value VBS, a DC motor 30 stops, and when the speed control voltage Va becomes higher than it, a DC motor rotates in a normal direction at the speed proportional to the difference, and when the voltage Va, on the contrary, becomes lower than the motor stopping voltage VBS, the motor 30 rotates reversely at the speed proportional to the difference. |
