Servo: The word comes from the Greek "slave" means. People want to be "servos" a handy tame tool that obeys the need for control signals. Before the signal arrives, the rotor is stationary; when the signal arrives, the rotor rotates immediately; when the signal disappears, the rotor can stop on its own. Because of its "servo" performance, hence the name.
Servo motor is generally divided into DC servo and AC servo,
1. For DC servo motor
Advantages: Accurate speed control, torque speed characteristics are hard, the principle is simple, easy to use, the price advantage
Disadvantages: brush commutation, speed limits, additional resistance, abrasive particles (for clean rooms)
2. For AC servo motor
Advantages: Good speed control features smooth control over the entire speed range with virtually no oscillation High efficiency, over 90% without heat High speed control Highly precise position control (depending on which encoder) Rated operation In the area, realize permanent torque; Low noise; No brush wear, maintenance-free; No wear particles, no sparks, Suitable for dust-free room,
Disadvantages: control is more complex, the drive parameters need to adjust the PID tuning parameters on-site, need more connections
DC servo motor applications
DC servo motor characteristics than the AC servo motor. Usually used in slightly larger power system, such as servo system position control.