Machine learning device, control system, and machine learning method

A machine learning device that performs machine learning of optimizing coefficients of a filter provided outside a servo control unit and provided in a motor control device that controls the rotation of a motor on the basis of measurement information of an external measuring instrument provided outside the motor control device and a control command input to the motor control device, the machine learning device comprising:

• a state information acquisition unit that acquires state information including the measurement information, the control command, and the coefficients of the filter;
• an action information output unit that outputs action information including adjustment information of the coefficients included in the state information to the filter;
• a reward output unit that outputs a reward value for reinforcement learning using a value function based on a difference between the measurement information and the control command;
• and
• a value function updating unit that updates an action value function on the basis of the reward value output by the reward output unit, the state information, and the action information.