| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect a torsional resonance frequency and a transfer function.SOLUTION: A control part 25 collects frequency spectrums of torque at each rotation frequency of a motor 3, produces a torque map representing a magnitude of a torque component by a brightness while setting a rotation frequency Fr to a vertical axis and a torque frequency F to a lateral axis, selects a line having a peak noticeably appearing on the line by torsional resonance from lines of Fr=F/N appearing on the torque map by peaks on frequency spectrums generated in frequencies F corresponding to the orders of the rotation frequency Fr, and sets the peak frequency on the selected line to a torsional resonance frequency. Then, a transfer function is calculated such that it coincides with the relationship between the frequency on the selected line and the magnitude of the torque component by using the set torsional resonance frequency. |
