Absolute Encoders: Accuracy Even in Complex Systems！

An absolute rotary encoder determines its position using a static reference point. The method is slightly different depending on whether the absolute rotary encoder is optical encoder or magnetic encoder, but the principle is the same either way. There are two discs, both with concentric rings with offset markers. One disc is fixed to the central shaft; the other moves freely. As the disc turns, the markers along the track of absolute encoders change position on the fixed disc. Each configuration along the disc of an absolute rotary encoder represents a unique binary code. Looking at the binary code within the absolute rotary encoder determines the absolute position of the object. For optical absolute encoders, the marker is an opening which lets through light. For magnetic absolute encoders, the markers are a magnetic sensor array that passes over a magnet and detects the position of the magnetic poles.
By having an integrated reference, an absolute rotary encoder is intrinsically able to deliver higher quality feedback:

Higher overall resolution and orientation
Better start up performance because of low homing (or initial position) time
Accurate motion detection along multiple axes
Multiple output protocols for better electronics integration
Better recovery from system or power failures
Another key feature of absolute encoders is the different output options. Encoders can’t just collect feedback data; they have to send it somewhere in a language that the larger system can understand. Absolute encoders use binary coding, which is translatable into many different protocols. If you have multiple components using the same communications bus (such as multiple electronics systems on a fire truck), then it is critical that the absolute rotary encoder can communicate with the bus.

The only cost of absolute encoders is increased system complexity.

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