Servo Motors – The muscle for Automation

Servo Motors - The muscle for Automation

These unique motors are used in a wide range of applications, including cutting fish filets in food processing, positioning portals in furniture manufacture, and driving robots in the automotive industry.


The servo drive and servo motor are both regarded to be parts of a servo drive system. The servo drive carefully transforms electrical power from the mains into power for the motor.

For the regulation, creation of set points, and monitoring of the components, it comprises power electronics and control electronics.

Electrical power is converted into movement by the servo motor. It is made up of parts that produce torque, a sensor for angle and feedback, and, occasionally, a holding brake to keep the position at zero current. 


Servo motors typically operate with frequent changes in speed and torque, stationary operation to hold locations, and short-term operation with significant overloads.

A device to unwind, process, and rewind films is an illustration of a servo-driven application. The machine also contains five servo drives that position, transport, and process the material in addition to the two winding drives with three-phase asynchronous motors and frequency inverters.


The typical characteristics of servo motors are a slimline design, a high power density, a low moment of inertia, and a high efficiency

They provide the best drive behavior with excellent dynamic performance and precision. They have been designed to work with servo drives.

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Servo motors are far more compact and have significantly lower moments of inertia than conventional three-phase motors.

As a result, they accelerate much more quickly and offer sufficient power for jobs requiring automation in a limited area.

A typical synchronous servo motor with its active parts for producing torque, a resolver for measuring angles and speed, and a brake for maintaining position at zero current. 

It is evident that just a small percentage of the entire volume is occupied by the active components that generate torque. The holding brake, the shaft position sensor, and the generous roller bearings take up the majority of the motor volume.

Large insulation clearances are necessary to ensure compliance with safety requirements; these clearances are indicated in the longitudinal motor section as free spaces.

Motor connections can be made quickly and without error using plug connectors. 


The servo motor features three power terminals, one earth connection, at least six connections for the shaft encoder, and two connections for temperature monitoring, in contrast to three-phase AC motors without speed feedback. 

The high volume of connections makes connection process problems quite likely. With plug connectors, commissioning time can be cut in half and connection problems are minimized.

The drive analyzes the signal from the angle and speed sensors found in servo motors. 

This makes it possible to precisely and dynamically control the motor’s position and speed. When employing a frequency inverter with a three-phase AC motor, the speed and dynamics setting range is significantly smaller.

Additionally, brakes are frequently included with servo motors, especially in situations where the machine may move due to gravity. 

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The brake is a normally-on mechanism that maintains position when the drive’s power source is turned off.


Asynchronous and synchronous technologies are both available for servo motors. To know more about servo motors, Click here.

Asynchronous servo motors have a large speed range, however because of field weakening operation, there is less torque available above the rated speed. 

They are especially well suited for less dynamic mechanics, such as trip drives with toothed belts, because they have a higher mass inertia than synchronous servo motors.

High energy magnets are used in the rotor of synchronized MCS servo motors. They are smaller, require no magnetizing current, and have a lower inertia than asynchronous servo motors with the same rated torque. 

Higher dynamic performance and better acceleration are the end consequence.


  • Servo motors can work at a variety of speeds and torque levels when coupled with a servo drive. In the second image, a synchronous servo motor with a 7.5Nm rating is demonstrated. 
  • The available current mostly sets a limit on the operational range. 
  • It establishes the upper portion of the torque curve and is based on a 24A servo drive in this image. Various drives will result in various curves.
  • The output voltage of the drive, which is reliant on the supply voltage, determines the highest speed that a synchronous motor is capable of reaching.

 For mains voltages of 360, 400, and 440V. The asynchronous servo motor doesn’t have a set speed limit like synchronous servo motors do, which is a difference. Get high quality Asynchronous and Synchronous servo motors by epoch automation.

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