Eltra Device Considers: Here’s What You Should Know

Eltra linear encoders check linear change and render position response in the form of electrical impulses. Furthermore, linear encoders provide precise position information for loads in servo-driven systems, in addition to the speed and direction data provided by a rotary encoder on the motor itself. According to the manufacturer, the addition of a linear encoder to stepper-driven systems, which generally operate in open-loop mode with no position feedback, increases the accuracy and reliability of the positioning system without the price and complexity of a servo motor.

To choose the linear encoder for a given application, first determine if the application needs absolute or incremental feedback.

Incremental Encoder

An incremental encoder is a kind of encoder that converts angular motion or shaft position into an analog or digital code, which can then be used to identify the position or motion of the encoder. The incremental encoder is one of the most often encountered rotary encoders.

In servo/light, industrial, and heavy-duty applications, incremental encoders may be used to provide positioning and motor speed feedback, among other things.


The use of incremental encoders provides excellent speed, and distance feedback since only a few sensors are involved, and the systems are both simple and economical. However, a reference device is required to calculate motion since an incremental encoder can only supply change information and cannot compute motion independently.

Absolute Encoder

The position value or data word sent by an absolute encoder at each rotation point indicates the encoder’s “absolute” location and is unique for each rotation point.


From the moment it is switched on, an absolute encoder can provide you with the exact position of the spinning shaft it monitors in real-time. How? A unique code from a disc that circles with the shaft is read by an optical, magnetic, or capacitive sensor and used to determine the sensor’s location.

Furthermore, an absolute encoder can achieve this without requiring the shaft to be rotated and retain its position even if power is suddenly interrupted. You will get a more accurate reading of your location if there are more distinct codes on the encoder disc.

The position of the shaft is known immediately when power is provided to an absolute encoder for the simple reason that it keeps the position of the shaft. Because you do not have to wait for a homing or calibration operation to complete because the shaft has been spun while the encoder was turned off, you may receive the position data you want much more quickly upon starting or after a power failure than you would otherwise. To get more detailed info on Eltra, visit on hyperlinked site.

On the other hand, an absolute encoder provides real-time delivery of the actual location. Therefore, achieving low latency when polling the encoder for a real-time position as necessary is becoming more crucial as more devices become digitized and linked to a common communication bus becomes more commonplace.

Who’s Who?

While linear encoders are often considered an add-on component to a system, the benefits they provide outweigh the additional labor and price. Because the linear encoder feedback allows the controller to adjust for screw positioning errors, a lower precision screw may be employed in ball screw-driven applications, for example.

Final Thoughts Our store is committed to offering the best possible prices and delivery times to its customers when it comes to encoders and other industrial equipment. However, when it comes to original equipment and replacement components, we’re typically not the official distributor or manufacturer’s dealer. Those trademarks and part numbers that appear on this page are the property of their respective owners.

Comments Off on Eltra Device Considers: Here’s What You Should Know