What are the three methods for servo driver to control servo motor?

Servo motor driver controls servo motor in three ways: speed control mode, torque control mode and position control mode. 1. The mechanical arm of a robot or spacecraft can be manufactured by controlling a servo motor. The servo motor is controlled by the controller, and the code inside the controller is written by the engineer. A controller without code or program will not control the servo motor to work. 2. The manipulator used on spacecraft is a combination of position control mode, torque control mode and speed control mode. Because of the high precision requirement of spacecraft manipulator, position control mode is needed. The other two modes are only auxiliary, which makes the manipulator work more efficiently.