| 摘要 |
PURPOSE:To enable to drive a pulse motor at near a resonance frequency by increasing an inertial moment near a resonance frequency to decrease the frequency. CONSTITUTION:A position detector 16 detects the position of an injecting cylinder 10, and a command pulse generator 17 receives a position signal 21 and outputs a command pulse 19 for driving a pulse motor 13 to move a spool 12 to the prescribed opening at the prescribed speed. When the frequency near the resonance frequency omega0 is programmed in a command pulse generator 17, an inertia switching signal 20 is output to a clutch 23 immediately before a command pulse of near the frequency omega0 is issued, the output shaft of a pulse motor 13 and a flywheel 24 are coupled to increase the inertia moment of the system to reduce the frequency omega0. |
