Servo Motor & Drive
A servomotor is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration.
It consists of a suitable motor coupled to a sensor for position feedback. It also requires a relatively sophisticated controller, often a dedicated
module designed specifically for use with servomotors. Servomotors are not a specific class of motor although the term servomotor is often used to refer
to a motor suitable for use in a closed-loop control system.
A servo drive receives a command signal from a control system, amplifies the signal, and transmits electric current to a servo motor in order to produce motion proportional to the command signal. Typically, the command signal represents a desired velocity, but can also represent a desired torque or position. A sensor attached to the servo motor reports the motor's actual status back to the servo drive. The servo drive then compares the actual motor status with the commanded motor status. It then alters the voltage frequency or pulse width to the motor so as to correct for any deviation from the commanded status.