Apparatus and method for controlling resonance suppression of machine tool

A method of controlling resonance suppression of a machine tool, the method comprising:

• storing, in a basic data storage part, information about a high-frequency gain limit value, a maximum value of interlinkage magnetic flux by an equivalent permanent magnet, a natural frequency of a servo motor part, an angular velocity at an operation point, a direct current gain of a resonance suppression controller, inductance of a winding of a stator of the servo motor part, the number of pole pairs of the servo motor part, resistance of a winding of a stator of the servo motor part, and inertia moment of force of the rotor of the servo motor part;
• executing, by a PLC, a control command through communication with a numerical control part or a main operation part;
• executing, by a servo drive, the control command transmitted from the PLC;
• applying, by a power conversion part, electrical energy to the servo motor part having a first servo motor and a second servo motor based on a signal of the servo drive;
• storing, in a first servo motor feedback information storage part, feedback information about a position and a speed of the first servo motor which is generated when the first servo motor and the second servo motor operate in parallel;
• storing, in a second servo motor feedback information storage part, feedback information about a position and a speed of the second servo motor which is generated when the second servo motor and the first servo motor operate in parallel;
• and
• calculating, by a calculation part, an invalid torque value to be applied to the power conversion part based on data stored in the basic data storage part and feedback information of the first servo motor and the second servo motor stored in the second servo motor feedback information storage part and the first servo motor feedback information storage part,
• wherein the power conversion part controls and suppresses resonance, which occurs when the servo motor part operates, by adjusting electrical energy to be applied to the first servo motor and the second servo motor of the servo motor part based on a value calculated by the calculation part.