Evaluation device, evaluation method and control device

A control device that controls an electric motor by closed loop control, the control device comprising:

• a speed control parts for generating a torque command for rotating the electric motor;
• a filter parts for applying a notch filter to the torque command;
• a speed detection parts for detecting a rotational speed of the electric motor;
• a characteristic acquisition parts for changing a parameter associated with a characteristic of the notch filter from a first value, which is a prescribed value, to a second value, and acquiring a change in a frequency response characteristic of the electric motor when the notch filter is applied;
• and
• a determination parts for determining the necessity of the notch filter based on the change in the frequency response characteristic that has been acquired,
• wherein the parameter is a parameter that represents a width or a depth of the notch filter, and the second value is a parameter having a filter effect smaller than the first value.

An evaluation method performed by an evaluation device that determines the necessity of a notch filter inserted in a control system that controls an electric motor by closed loop control, the evaluation method comprising:

• a characteristic acquisition step for changing a parameter associated with a characteristic of the notch filter from a first value, which is a prescribed value, to a second value, and acquiring a change in a frequency response characteristic of the electric motor when the notch filter is applied;
• and
• a determination step for determining the necessity of the notch filter based on the change in the frequency response characteristic that has been acquired,
• wherein the parameter is a parameter that represents a width or a depth of the notch filter, and the second value is a parameter having a filter effect smaller than the first value.