5 important questions about servomotors

What is a servomotor?

A servomotor also called servomechanism and is often abbreviated to servo. The name of the servomotor comes from a Latin word servus which translated into English means slave or servant. Actually, the name servo motor is related to the term servo mechanism. It is a device used to automatically control a mechanical system without direct mechanical connections. A servo is an electric motor and it can be said that this is one of the most important motors in the 21st century in mass production.

Servomotor

See our offer for Panasonic servomotors

What can a servo motor do?

7 most important properties of a servomotor:

  1. Large speed range
  2. Clockwise and anticlockwise rotation and standstill.
  3. Large torque range in both directions of rotation
  4. Accurate speed and torque
  5. Short torque adjustment time
  6. High standstill torque
  7. Short lead time

These types of motors are specially developed to carry out complex and accurate assignments. They rotate 360°, can stop at specified times and have the ability to change direction, i.e. turn back and forth. They are great devices because a servo can quickly start up and then come to a standstill again. In addition, they can run at many different speeds and can be programmed very well.

How does a servo motor work?

With a servo, the motor is constantly monitored to adjust its movements. So it is more of a mechanism than a specific motor. This concerns motors that continuously keep their moment, speed, position and acceleration the same. The motors use a sensor, feedback encoder and a controller to create a feedback system.

It works step by step as follows: Servo motors run on electricity. They contain a spinning rotor on ball bearings, which is controlled by an encoder or pulse generator. Such an encoder sends a signal to a sensor, which automatically measures the position of the rotor. The sensor sends a signal to the servo amplifier, which controls the movements of the rotor. By programming the encoder, a servo-rotor has its own feedback mechanism.

What is the difference between stepper motors and servo motors?

A big misunderstanding is that a stepper motor is also a kind of servomotor, yet this is not correct and it does make a difference. With a stepper motor there is no feedback, while this is characteristic of servo motors and this is exactly what “servus” stands for.

The 4 biggest differences between a stepper motor and servo motor:

What are different types of servo motors?

More or less there are two types of servomotors. The first are DC servo motors that operate on direct current and the second are AC servo motors that operate on alternating current. Below is a table with the main features:

 

Engine Benefits Disadvantages
DC servo motor
  • Wash for very large powers
  • Predecessor of servo technology
  • Carbon Brushes
  • DC power supply
  • Expensive engines
  • Maintenance sensitive
AC servo motor
  • Small mass inertia
  • High speed possible
  • Fast torque build
  • High thermal load
  • Compact design
  • Low maintenance
  • Not worth mentioning
As can be seen in the table, there are no significant drawbacks for the AC servo motor. Then why would you use a reducer? Firstly, because this allows you to achieve a very low speed, possibly together with a higher torque. Second, also if you want higher torque (there are high torque servo motors only they get exponentially more expensive compared to the smaller motors). Thirdly, for inertia matching, so that the load does not determine the behavior of the motor. Fourth, to absorb the high radial or axial forces of the application. And ultimately also because gear units are available in right-angled versions and because of this you can turn a corner because otherwise the motor is outside the construction.

See our offer for Siemens servomotors

Productcategories

Why is the SIMATIC ET 200SP so powerfull?

Why is the SIMATIC ET 200SP so powerfull?

The SIMATIC ET 200SP is a I/O system, this ensures communication between computer systems. It has standard IP20 protection that can communicate with SIMATIC PCS 7 automation systems via PROFINET IO or PROFIBUS DP. It is designed for installation in enclosures or...

What is a PLC?

What is a PLC?

PLC stands for Programmable Logic Controller . These are electronic devices in the form of a digital computer. They are designed for controlling production processes and come in various shapes and sizes. For example, you have large ones that have 10,000 entrances and...

Inverter

Inverter

What is a frequency converter? A frequency converter (frequency converter) or also called drive in the field, is a type of motor controller that an electric motor drives by changing the frequency of a supplied power supply while the voltage varies with it so that the...

11 tips for an effective HMI

11 tips for an effective HMI

There are many different ways to develop HMI screens for machine and process automation applications. An effective structure requires discipline in the design. The feel, appearance and ease of use of an HMI can vary widely. This is because of all the tools, object...

Introducing: Peter Brakenhoff

Introducing: Peter Brakenhoff

PartTracker is growing. In order to give our clients the attention they deserve, we have strengthened our team with Peter Brakenhoff. So this month we ask our five questions to Peter. Who are you and what are you doing here? My name is Peter Brakenhoff, I live in the...

A new colleague

A new colleague

PartTracker is busy. Time to welcome a new colleague. This summer, Wesley van Beelen started in the role of Sales Support Engineer. We just asked him a few questions. Who are you and what are you doing here? My name is Wesley van Beelen, 22 years old. My hometown is...

Earn more with the circular economy

Earn more with the circular economy

The change of our economy to a circular economy offers opportunities for production companies and their panel and machine builders. You may think that sustainability is 'not your thing' and still participate because it is now a profitable business activity. Billions...

25 years of product support?

25 years of product support?

How long does a machine remain operational. It is difficult to attach hard figures to this. Still, you want to have spare parts and repairs available for as long as possible. That's a challenge. As long as the machine is running, you want to make use of optimal...