| 摘要 |
PURPOSE:To shorten a rise time by providing a signal changeover means for each region using a desired value as an input signal and the current value of a motor rotational speed as a feedback signal after a servomotor reaches a target constant-speed rotary region. CONSTITUTION:When reaching a target constant-speed rotary region of a current value S1 is discriminated by constant-speed rotary-region reaching discriminating means 11, 12, a controlled variable Sc to a driver circuit 20 is changed over selectively from a fixed quantity Scst to a variable value. When a start command is written to an output port 15, the signal changeover means for each region 11, 12 change over a fixed quantity Scst so as to be input to the driver circuit 20 because the number of revolution of a DC servomotor 1 is zero, and the CPU 11 outputs a fixed quantity Scst to the driver circuit 20 as the controlled variable Sc. Accordingly, the DC servomotor 1 is acceleration-controlled, a feedback signal Sf is interrupted until the servomotor reaches a target constant-speed rotation from a rotational drive start point, and a fixed quantity Scst is added as the controlled variable Sc in place of a desired value Sg, thus allowing reaching the target constant-speed rotary region at an early time. |
