| 摘要 |
PURPOSE:To obtain sufficient speed control even at a low speed by increasing the resolution of a pulse generator by n-times and at a low speed by setting the speed set value by n-times leaving the output from the pulse generator as it is. CONSTITUTION:The pulse number of a pulse generator 3 is converted into a speed signal with an F/V converter 4 and the output of a speed setter 5 is converted into a speed command signal with a D/A converter 6. The deviation signal between the speed command signal and the speed signal is supplied to a motor 2 through a speed regulator 7 and a thyristor converter 1. Here, let the resolution of the pulse generator 3 be n-times. At a high speed, contacts 82A and 82D are closed and the output of the speed setter is set by one(1) time. At the same time, the pulse signal is divided by 1/n. On the other hand, at a low speed, the contacts 82B and 82C are closed and the output of the speed setter 5 is increased by n-times, while the pulse signal is divided by 1/1. |
