Absolute Shaft Encoder
Absolute shaft encoders assign a unique, digitally encoded signal to each individual measured increment. Single turn as well as multi - turn types are available.
The special feature of absolute shaft encoders is that they assign a unique, digitally encoded signal to each individual measured increment. The method of transducing in these absolute encoders prevents erroneous readings whether by a power failure, or by a transient malfunction. After the absolute shaft encoders are switched on again, or power is restored, the position can be read out. Absolute shaft encoders are not necessary to move to a reference position, as it is for shaft encoders of the incremental type.
Example of application for absolute encoder
- Overhead support robots
- Ventilation flaps
- Spinning machines
- Conveyor belts
- Cam controllers
- Injection moulding machines
- Packaging machinery
- Extruders
- Folding machines
- Printing machines
- High lift storage systems
- Stamping machines
Absolute shaft encoders generate a signal for each incremental change in position. Encoder diameter ranges from 30 to 76mm with push - pull / push - pull complimentary/ line driver (RS422) outputs are available.
With the optical transformation, a line coded dise made of metal plastic or glass and positioned on a rotary bearing interrupts the infrared light ray emitted by gallium arsenide sender diode. The number of lines determines the resolution, i.e. the measuring point within a revolution. The interruptions of the light ray are sensed by the receptor element and electronically processed. The information is then made available as a rectangular signal at the encoder output.
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