| 摘要 |
PURPOSE:To perform the positioning control system of a linear motor having stable and high speed servo properties by switching the gain of an error amplifier between the case that a linear motor movable element is moved at the prescribed speed and the case that the element is moved at more than the prescribed speed. CONSTITUTION:A speed command signal in response to an error between a position command applied from a point P2 and a signal of a potentiometer 41 and a speed feedback signal are differentially compared at an addition point 28, and amplified by K1 and K2 times by error amplifiers 29, 30, respectively. The output of error amplifiers 29, 30 are fed through a switch 31 and a voltage/current converter 33 to a current controller 34. The switch 31 is shifted to the K1 side when the speed of the movable element of a linear motor is the prescribed speed or higher set by a level detector 32, and to the K2 side when the speed is the prescribed speed or lower set by the detector 32. |
