Servo Motor

伺服电机Common

A motor with position feedback that can be closed-loop controlled precisely for position and speed.

A servo motor is a motor fitted with position feedback, such as an encoder, that together with a servo drive forms a closed control loop able to precisely track position, velocity, or torque commands. “Servo” describes this closed-loop, tracking style of control, not any particular motor construction — internally it's usually a permanent-magnet synchronous motor or a brushless DC motor. Unlike a stepper motor, it can detect and correct errors in real time, keeping its accuracy even when the load changes. Industrial robots, CNC machine tools, and robot joints all make heavy use of servo motors. A humanoid robot's joint module is, in essence, a compact servo system: a motor plus a reducer plus an encoder plus a driver.

Also called: Servo System
Related: Servo Drive (Motor Driver) · Rotary Encoder · Permanent Magnet Synchronous Motor (PMSM) · Stepper Motor · Joint Actuator Module · Cascade Control
Sources: Servomotor - Wikipedia