Control system, machine learning apparatus, maintenance assistance apparatus, data generating method, and maintenance assisting method

A machine learning apparatus, comprising:

• a non-transitory computer readable medium storing a database in which first information, second information and third information are stored and correlated with each other;
• and
• machine learning processing circuitry configured to perform machine learning based on the first information, the second information and the third information stored in the database,
• wherein the first information is associated with a rotational speed of a reducer in an actuator, the second information is associated with a torque acting on the reducer, the third information indicates a concentration of iron powder in grease in the reducer, and the machine learning builds a concentration estimation model indicating a relationship between the first information, the second information and the third information.

A method, comprising:

• obtaining learning data of first information, second information and third information that are correlated with each other;
• and
• performing machine learning based on the learning data,
• wherein the first information is associated with a rotational speed of a reducer in an actuator, the second information is associated with a torque acting on the reducer, the third information indicates a concentration of iron powder in grease in the reducer, and the machine learning builds a concentration estimation model indicating a relationship between the first information, the second information and the third information.