| 摘要 |
PROBLEM TO BE SOLVED: To provide a servomotor speed control device that precisely calculates a rotational speed of a servomotor over a wide rotational speed range.SOLUTION: A servomotor speed control device 180 determines in a rotational speed determination section 1812 a magnitude relationship of a motor command speed output from a motor speed command section 1811 with a predetermined first rotational speed and a second rotational speed higher than the first rotational speed, and adopts as a rotational speed of a servomotor 142 a calculation result of an input capture rotational speed calculation section 1813 if the motor command speed is equal to or lower than the first rotational speed and a calculation result of a phase count rotational speed calculation section 1814 if the motor command speed is equal to or higher than the second rotational speed. In addition, if the motor command speed is higher than the first rotational speed and lower than the second rotational speed, the calculation result of the phase count rotational speed calculation section 1814 is adopted as the rotational speed of the servomotor 142 while the input capture rotational speed calculation section 1813 and the phase count rotational speed calculation section 1814 are operated. |
