Motion Control is a sub-field of automation in which the position, velocity, or torque of a machine’s moving parts are controlled with high precision. While a standard VFD might just spin a pump, a motion control system allows a robotic arm to pick up a component within $0.01\text{ mm}$ of accuracy while moving at high speeds.

Like AC Servo driver and Motor systems, Hybrid controller, Position controller. How to tune a PID loop for a servo motor. The difference between Absolute and Incremental encoders. How to select the right gearbox ratio for your torque requirements.