| 摘要 |
PURPOSE:To make it possible to cut electric peak power in actuation by reducing gradually the electric current of a synchronizer in accordance with the output pattern of a function generator after detecting the revolving speed of the synchronizer reaching a fixed value by an upper-limit-speed detector. CONSTITUTION:Function generator 24 outputs a signal that decreases as its input increases as shown in fig. (a) and is reset on the disappearance of the input. On receiving the signal from upper-limit-speed detector 26, oxcillator 25 integrates and outputs, as shown in fig. (b), the number of pulses the oscillator generates by itself and is reset at the time of the disappearance of the input. Checking the output of speed generator 9, upper-limit-speed detector 26, when the value exceeds a fixed value, generates the ON signal shown in fig. (c) and then resets on the end of actuation by a signal from an actuating interlock. For the purpose, before synchronizer 6 reaches its rated speed, the output of current control circuit 15 is gradually decreased as shown in fig (d) in accordance with the output pattern of fucntion generator 24 shown in fig. (a), and consequently a gradual change can be made as shown by the solid line in fig. (e) without generating any peak. |
