Characteristic evaluation device and characteristic evaluation method of shaft coupling

A characteristic evaluation method of a shaft coupling for evaluating a characteristic of the shaft coupling by using a characteristic evaluation device, the shaft coupling being configured to connect a drive shaft and a driven shaft so as to transmit torque from the drive shaft to the driven shaft,

• the characteristic evaluation device comprising:
• a motor system including a drive motor configured to apply drive torque to the drive shaft, a rotation angle sensor configured to acquire a rotation angle of the drive shaft, and a motor control unit configured to control the drive motor based on a given torque command so as to cause the drive motor to output torque corresponding to the torque command;
• and
• a rotational load connected to the driven shaft,
• wherein the characteristic evaluation device is configured to output the torque command to the motor control unit so as to output the drive torque of a prescribed value and configured to calculate a frequency response of a gain of an amplitude of an angular velocity of the rotation angle against an amplitude of the torque corresponding to the torque command based on the rotation angle detected by the rotation angle sensor,
• the characteristic evaluation method comprising:
• acquiring the frequency response in a state where the shaft coupling connects the drive shaft and the driven shaft;
• and
• calculating the characteristic of the shaft coupling based on the acquired frequency response and a response characteristic of the motor system.