Servomotors are large electric machines such as single-phase induction motors, synchronous motors, three-phase asynchronous motors and direct current motors, and are used when a continuous power conversion is required. Servomotors generally operate at low speed with high torque. Some applications where servomotors are used are packers, mats with programmed stops, cutting and welding machines, graphic machines, computers, etc.
However, there are some special applications https://www.mrosupply.com/bearings/mounted-bearings/bearing-inserts/487570_cb22436h_rexnord/ in which it is not necessary to apply a continuous energy conversion process, but requires the use of a motor capable of performing a specific operation, ie the servomotor is suitable for this. The basic operating principle of these electric motors is the same as the operating principle of rotating electric machines.
The servo motor, often called the control motor, is an electric motor specially designed and built for use in feedback control systems, fulfilling the role of actuator element. These motors have a high dynamic response, requiring little rotor inertia. Another feature of these engines is that they have smaller diameter and longer length. When compared to solutions with frequency inverters and induction motors, its main advantages are rapid acceleration, high speed precision, greater torque control, and the possibility of position control.