| 摘要 |
PURPOSE:To allow speed control with an appropriate response time upon fluctuation of load. CONSTITUTION:A zero setting section 11 is inserted between the speed setting section 3 and the current control operating section 4 of a speed controller 9 through a switch 10. The zero setting section 11 is switched by the switch 10 to set the speed forcibly at zero for the current control operating section 4. A detection speed from a current detecting section 6, a set speed, and a speed difference from the set speed calculated at the speed control operating section 4 are fed to a speed increase detecting section 12. The speed increase detecting section 12 decides abrupt increase of detected speed and turn the switch 10 from the speed setting section 3 side to the zero setting section 11 side and eventually turns the switch 10 from the zero setting section 11 side to the speed setting section 3 side when the detected speed is settled to the set speed. |
