Absolute encoders Manufacturers online

Absolute encoders are sensors that are used to measure angular positions and provide a unique digital code for each position.

In contrast to incremental encoders, absolute encoders retain their exact position even after a power failure.

Below you will find the functionality and areas of application of absolute rotary encoders and their advantages:

How absolute encoders work:

An absolute rotary encoder uses a disk with optical, magnetic or capacitive markings that is divided into discrete steps.
In optical models, a light source shines through the coded disk. Depending on the position of the disk, different markings are detected, which the encoder converts into unique position data. the evaluation is similar for magnetic or capacitive encoders.
The absolute rotary encoder thus outputs a unique number per revolution that corresponds to the current position of the shaft.
In contrast to incremental encoders, absolute encoders always detect the exact angular position and do not need to be referenced after a restart.

Areas of application for absolute encoders:

1. Position determination:
Absolute encoders provide unambiguous position information that does not depend on the number of revolutions. They are used in applications where precise and captive position determination is required, e.g. in CNC machines or industrial robots.

2. Feedback in control systems:
They are used in closed control loops to provide accurate feedback to control systems. This is important for the precise control of machine movements in automation technology.

3. Safety-critical applications:
In safety-critical applications, such as elevators or cranes, absolute rotary encoders continuously provide accurate position data to ensure safe and reliable operation.

4. Multi-circuit applications (multiturn):
Multiturn encoders can track position over multiple revolutions. This is particularly useful in applications where large ranges of motion need to be covered, such as telescopes, wind turbines or lifting devices.

5. Synchronous generators and servo drives:
In power engineering and servo drives, absolute rotary encoders are used for precise position and speed determination to enable synchronization and control of motors and generators.

6. Detecting the start position after a power failure:
As absolute rotary encoders know their position even after a restart, they are used in systems that need to be ready for operation again immediately after a power failure without requiring a reference run.

7. Automated production systems:
In production lines and automated production systems, absolute rotary encoders help to monitor and control the exact position of workpieces or tools.

8. Medical technology and precision devices:
Absolute rotary encoders are used in medical devices and other precision applications where accurate and unchanging position data is critical.

Advantages of absolute encoders:

• Absolute encoders detect the exact position of the shaft as soon as it is switched on, without the need for a reference run. This saves time and avoids errors after power failures or restarts.
• The position information is retained even after a power failure, as absolute rotary encoders assign a unique position to each angle. They do not need to be set to zero or calibrated, which offers greater operational reliability.
• As each position is described by a unique code (e.g. a digital bit value), absolute rotary encoders can transmit more precise and reliable data, especially in safety-critical applications.
• Multi-turn absolute encoders not only detect the position within one revolution, but also the number of revolutions, making them useful for multi-turn applications.
• Absolute encoders are available in different versions (e.g. optical, magnetic, capacitive) so that they can be used in various environments and applications - from harsh industrial environments to high-precision measurement systems.
• Due to their design and the ability to measure the exact position without mechanical reset, absolute encoders require less maintenance compared to incremental systems.
• Absolute encoders generally offer high resolution, which means that even the smallest movements can be detected accurately. This is particularly important for positioning applications in robotics or automation.
• Absolute encoders support various digital interfaces such as CANopen, Profibus, Ethernet, SSI (Synchronous Serial Interface), which facilitates integration into industrial control systems.

Absolute encoders are indispensable in applications that require high precision and reliability, especially in safety-critical and automated systems.

Here are the most important aspects to look out for when buying absolute encoders:

When purchasing absolute encoders, there are several important aspects to consider to ensure they meet the specific requirements of your application:

• Singleturn encoders detect position within a single revolution. Multiturn encoders, on the other hand, can track the position over several revolutions. Choose the right type depending on your requirements.
• The resolution indicates how many unique positions the encoder can detect per revolution. A higher resolution enables more precise position measurements, which can be decisive in many applications.
• Make sure that the encoder supports the right interface for your system, such as SSI, CANopen, Profibus, EtherCAT or other industrial networks. Compatibility with your control architecture is crucial.
• Make sure that the encoder is compatible with the operating voltage of your system. common voltages are 5V, 12V or 24V.
• Consider the operating conditions such as temperature, humidity, dust and vibrations. Select an encoder that is suitable for the environment in which it is to be used.
• Check the mechanical compatibility of the encoder, including shaft type (hollow shaft, solid shaft), size and mounting options.
• Pay attention to the accuracy of the encoder, i.e. how accurately it can detect the position, as well as its long-term stability and reliability.
• In safety-critical applications, encoders with redundant measuring systems or integrated safety functions may be required. consider whether such functions are necessary for your application.
• Manufacturer certifications can be an indicator of quality. A more expensive absolute encoder with higher quality and longevity may be more economical in the long run.

By considering these factors, you can select an absolute encoder that is best suited to your specific requirements and offers reliable performance.

Absolute encoders can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Absolute encoders from all over the world can be found on Exportpages.