| 摘要 |
PURPOSE:To enable a recovery smoothly returning to the set speed of rotation, with a hunting prevented from occurring, in cases that a rotational speed of the motor come to be above the set speed of rotation due to a disturbance. CONSTITUTION:A speed of DC motor 1 is detected by a frequency generator 3, being converted into a voltage signal by a F-V converter 4, with a signal inputted to a forward run-brake switching circuit 5, and in accordance with whether an operation at forward run or brake, are switched a drive circuit 2 and a differential amplifier outpout selector circuit 6. An output signal of differential amplifier 7 is given to the drive circuit 2 through the output selector circuit 6 and DC amplifier 8, making a control of the motor 1. The forward run-brake switching circuit 5, by means of switching the drive circuit 2 through a drive circuit switching circuit 9, will change a generating torque of the motor 1 to a positive direction and negative direction in a manner of interlocking, and in case of the rotational speed increasing due to a disturbance, a recovery to smoothly return to the initial speed of rotation can be operated without causing phenomena of hunting. |
