Numerical control system and motor drive controller

A numerical control system that controls machine drive systems included in a machine tool that performs machining using a tool, according to a numerical control program, the system comprising:

• processing circuitry
• to acquire a disturbance force or a disturbance torque applied to each of the machine drive systems, and coordinate-transform the disturbance force or the disturbance torque into a tool reference coordinate system for output;
• and
• to calculate cutting process parameters that determine characteristics of a cutting process model and dynamic characteristic parameters that determine characteristics of a dynamics model of the machine tool, using the disturbance force or the disturbance torque output, states of the machine drive systems, predetermined equation models, and cutting conditions, wherein
• the equation models define relationships between the cutting process parameters, the dynamic characteristic parameters, and the disturbance force or the disturbance torque, and
• the processing circuitry is further configured to correct commands of the numerical control program based on a simulation of the dynamics model and the cutting process model.