| 摘要 |
PURPOSE: To maintain the balance of an operation force transmitted to a guide ring by a method wherein operation forces generated by a pair of electric servomotors are individually determined by a force sensor and a servomotor control part is regulated so that the two operation forces are balanced with each other. CONSTITUTION: An opening control command K responding to a difference between a speed control command V and detecting position signals PA and PB is outputted from an opening control device 15 and the operation forces of motor-drive servo motors 4 and 5 are generated according to an opening control command K therefrom. The operation forces of the motor-driven servo motors 4 and 5 are individually detected by load cells 50 and 51 being a force sensor, and detecting signals FA and AB to indicate detecting forces therefrom. A force deviation signalΔF between the FA and FB is added to the opening control command K by adders 55 and 56. In a case of FA<FB, theΔF forms a negative value and in a case of FA>FB,ΔF forms a positive value and regulation is made so that the operation forces of the motor-driven motors 4 and 5 are balanced with each other. This constittution high-precisely balances the operation forces, transmitted to a guide ring 1, with each other.
|
