Encoder
Encoder
[2] An encoder is a device that measures devices' position/direction/speed.
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Types
Types
[2] [2.2] Most encoders are classified as either rotary or linear types, which are further subcategorized based on measurement techniques: either absolute or quadrature.
Linear and rotary encoder
Linear and rotary encoder
[2.2] A rotary encoder provides feedback based on a rotating device. This encoder can convert an object's anguilar position/motion based on the shaft measurement
Absolute and quadrature encoder
Absolute and quadrature encoder
An absolute encoder [2.2] measure angular position (Fig. 1) and encodes a motor's absolute measurement anytime. At each point along its linear graph, an absolute encoder's rotational axis associates to a specific code, meaning the encoder's instantaneous position is known right from powering the encoder. The name refers that it measures and outputs the exact, unique physical position of a shaft/linear axis relative to a fixed start "absolute" point instead of a just counting steps/movement overtime.
[2.2] Fig. 1
An quadrature/increment encoder [2.2] measures distance, linear position, and speed (Fig. 1), and depicts incremental changes in the encoder's position. IO knowing the actual position, increment encoders encode positions by respect to a known reference point.
increment: occuring/increasing in small/steady steps over time, IO big sudden change
[2] [2.2] Encoders can be classified based on the technology being used, such as: mechanical, magnetic, optical, electromagnetic, capacitive, laser, inductive.
Position encoder
Position encoder
[2.2] A position encoder measures an object's mechanical position, the absolute position, or the position change (an increment change) .
[2.2]
Single and multiturn absolute encoders
Single and multiturn absolute encoders
[2.2] An absolute encoder is further classified as single or multiturn type
[2.2]
Operation
Operation
[2.2] An encoder often uses a transducer to measure distances between 2 points. A cable/rod runs between the transducer and the detected object for movement. As the transducer moves, its data is collected from the cable to output a signal linear to the object's movement. The measured distance is used by the linear encoder to determine the object's position.
[2.2]
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