What is an Encoder

An encoder is an electro mechanical feedback device used to give information on position, speed, count or direction. Encoders are a type of position sensor and part of our product range here at Variohm. 

Encoders are used within a wide range of equipment throughout many different industries and convert motion into an electrical signal to be read by the system control device enabling a function or process. 

Encoders usually comprise of a plastic or metal housing to protect the electronics, usually operating on a magnetic or optical principles and a variety of mounting face options depending on the application requires. 

What is an Encoder used for?

Some of the most common applications for encoders include;

• Cut-to-length applications 
• Robotics
• Printing & Labelling
• Packaging
• Automation
• Filling
• Sorting
• Conveying 

Types of Encoders

There are two main types of Encoders; Incremental Encoders and Absolute Encoders

What is an Incremental Encoder

An incremental (or relative) encoder has two output signals; A and B or high and low, it provides a steady stream of high and low outputs, moving from one position to another repetitively. The specific position of the device is not measured, the output given shows that the position has changed.

Incremental encoders are used for applications where repetitive movement in the same direction needs to be monitored such as; 

• General factory automation 
• Heavy duty applications in paper mills and similar 
• Robotics 
• Speed measurement 

What is an Absolute Encoder

An absolute encoder provides a true absolute position using a variety of digital interfaces/outputs with high resolution (bit) for greater accuracy.   

Absolute encoders can be used for applications when the exact position needs to be known such as;

• Telescope Position
• Crane Position
• Valve Positioning
• Machine Tool
• Linear Actuator
• Motor Position
• Hoist & Winch

There are two types of absolute encoders; single turn and multi-turn. Single turn absolute encoders can give the exact position within one full turn. Multi-turn absolute encoders can give position feedback through multiple shaft rotations - sometimes up to half a billion turns. Multi turn encoders can always give exact position even if the power is switched off and the encoder is moved it will know its new position when power is restored.

Encoders from Variohm 

Take a look at the full ranges we can offer for;

• Absolute shaft encoders with both single and multi-turn outputs
• Absolute hollow shaft encoders with both single and multi-turn outputs
• Incremental hollow shaft encoders
• Incremental rotary shaft encoders