Servo motors

Title: Servo motors | Festo

Description: Servo motors from Festo offer the best efficiency, ease of operation, flexibility and precision in industrial automation.

Servo motors

For every application in industrial automation, servo motors from Festo are easy to operate, extremely flexible, and offer maximum precision as well as reliability – and are very cost efficient too. Servo drives can control and hold positions, torque and speeds precisely and in fractions of a second. This enables complex machine drives that can also realise difficult production processes. That is why servo motors are particularly suitable in robotics and for automation solutions.

You can find more products in the following category: Motors and servo drives

Servo motors from Festo

Festo servo motors together with servo drives form the perfect link between your mechanical system and your control system, and they are quick and easy to commission as a complete drive system with the Festo Automation Suite. Our motto is maximum connectivity of hardware and software. You can put together combinations of electric products that completely meet your application requirements, irrespective of your electromechanical system and control environment.

Festo Automation Suite

Servo motor EMMT-AS

Our EMMT-AS is a dynamic, brushless, permanently excited AC synchronous servo motor. It was designed primarily for demanding and dynamic applications. This motor, which is part of our Core Range, is characterised by an extremely low cogging torque, which enables it to achieve high synchronisation, even at low speeds, as well as good controllability and track accuracy in positioning tasks. The electronic rating plate contains all the important motor data. This can be read by the servo drive CMMT-AS and then used to automatically set the parameters for the servo motor. The space-saving one cable plug solution also significantly reduces installation effort.

Servo motor EMMT-AS

Servo motor EMMB-AS

The compact and extremely economical EMMB-AS is also a brushless, permanently excited AC synchronous servo motor. Available in four performance versions, it is suitable for simple positioning tasks, especially in the electronics industry, small parts assembly and in test stations. It is available as standard with a digital single-turn absolute measuring system, optionally also with a multi-turn system. When combined with axes ELGC, mini slides EGSC and motor controller CMMT-AS, the result is a perfect component match.

Servo motor EMMB-AS

Servo motor EMME-AS

Reliable, dynamic, precise: the EMME-AS is our powerful AC synchronous servo motor with optimised connection technology for dynamic applications. The motor is available with classic 2-cable standard lines. Degree of protection IP54 on the motor shaft without shaft seal, IP65 on the motor shaft with shaft seal and for the motor housing and power/encoder connection ensure safe operation. The brushless, permanently excited synchronous servo motor is available in variants with absolute safety encoder, multi-turn and HIPERFACE®.

Servo motor EMME-AS

What are servo motors?

The term servo motor comes from the Latin word "servus" – "servant". This is because servo motors were originally designed as simple auxiliary drives for use in machine tools. Today, a servo motor is generally understood as being mostly an electric motor that has a control mechanism and can provide feedback on its rotational or linear position.

Servo motors are characterised by:

  • High dynamic response
  • High positioning accuracy
  • High overload capacity in a wide speed range
  • High speed accuracy
  • Large rotational speed setting ranges

What are the different types of servo motors?

Servo motors can be operated with electronic position, torque or speed control. Sometimes they are also operated in a combination of different types of control mechanisms. They can be divided into two basic types – synchronous and asynchronous servo motors. The fundamental difference between synchronous and asynchronous servo motors lies in their operating mode and design.

A synchronous servo motor generates a magnetic rotating field that rotates exactly synchronously with the frequency of the applied voltage or current. The speed of the motor is thus directly proportional to the frequency of the applied voltage or current. Synchronous motors are typically used when high precision and speed are required.

An asynchronous servo motor, on the other hand, works differently. In an asynchronous servo motor, the magnetic field is generated by passing current through the rotor. The rotation of the rotor is caused by the interaction between the rotating magnetic field and the conductors in the rotor. The speed of an asynchronous servo motor depends on the load it is driving and is generally lower than that of a synchronous servo motor. Asynchronous servo motors are typically used for applications with higher torque.

So whether a synchronous or an asynchronous servo motor is better suited for the application always depends on the specific requirements.

Permanently excited synchronous servo motors, asynchronous motors and brushed DC motors are widely used as servo motors. AC servo motors are usually motors that are operated using supply voltages that are generated directly by rectifying an alternating voltage. In contrast, servo motors that can be operated directly using an extra-low voltage are called DC servo motors. However, this classification doesn't say anything about the motor type. According to this definition, permanently excited synchronous motors are used both as AC and DC synchronous motors. Asynchronous motors and reluctance motors are mainly used as AC servo motors; permanently or externally excited, brushed DC motors are used more as DC servo motors.

In which industries are servo motors used?

With increasing automation in all areas of machine and plant construction comes the need for ever shorter cycle times and greater flexibility when changing products. This development has led to the servo drives used today. These motors are mainly used for applications in the following industries:

  • Packaging technology
  • Plastics industry
  • Metal industry
  • Food and beverage industry

Servo motors are particularly valued in these industries because their performance and application can be scaled. They always offer the right performance, whether as a direct drive for high-precision axes or as a cost-effective motor-gear unit combination. In addition, the effort and time needed to cable and install servo motors is low, as they can be used with digital signal transmission and combined cables.