Encoder is a sensing device that provides feedback. Encoders convert motion to an electrical signal that can be read by some type of control device in a motion control system. The encoder sends a feedback signal that can be used to determine position, count, speed, or direction. A control device can use this information to send a command for a particular function.
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The encoder converts angular displacement or linear displacement into electrical signals. According to the working principle, encoders can be divided into two categories: incremental type and absolute type.
The incremental encoder converts the displacement into a periodic electrical signal, and then converts the electrical signal into a count pulse. The number of pulses represents the magnitude of the displacement.
Each position of the absolute encoder corresponds to a certain digital code, so its indication value is only related to the starting and ending positions of the measurement, and has nothing to do with the intermediate process of the measurement.
Incremental encoders have one disadvantage: loss of axis position in the event of a power failure. However, with absolute encoders, the axis position is not lost even in the event of a power failure. Absolute encoders are more expensive, more precise and larger than incremental encoders.
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