A servomotor is a motor, very often sold as a complete module, which is used within a position-control or speed-control feedback control system mainly control valves, such as motor-operated control valves. Servomotors are used in applications such as machine tools, pen plotters, and other process systems. Motors intended for use in a servomechanism must have well-documented characteristics for speed, torque, and power. The speed vs. torque curve is quite important and is high ratio for a servo motor. Dynamic response characteristics such as winding inductance and rotor inertia are also important; these factors limit the overall performance of the servomechanism loop. Large, powerful, but slow-responding servo loops may use conventional AC or DC motors and drive systems with position or speed feedback on the motor. As dynamic response requirements increase, more specialized motor designs such as coreless motors are used. AC motors' superior power density and acceleration characteristics compared to that of DC motors tends to favor PM synchronous, BLDC, induction, and SRM drive applications. COUNT 5
QSN1 What may servo motors be used for? ANS1 machine tools, pen plotters, and other process systems QSN2 What must be well understood when applying a servo motor for use? ANS2 speed, torque, and power QSN3 What factors limit performance of servo motors? ANS3 winding inductance and rotor inertia QSN4 Large, slow servos can use what types of motors? ANS4 conventional AC or DC motors QSN5 When might coreless motors be used in servo applications? ANS5 As dynamic response requirements increase