• Rotary Encoder is a sensor that detects and converts mechanical transfer or displacement into electric signal. It detects the position, speed, angle of FA system by means of converting analog signal generated from a revolution of the shaft into digital signal by the internal fixed circuit.

• High Resolution
• Easy to Record The Measuring Value
• High Stability
  Since it is digital output unlike analog output, it is highly stable because it is not affected even if there is noise below a certain level.
• Various Kinds of Type
  There are various kinds of rotary encoder with wide resolution, appearance.

• Rotary encoder is basically composed of mechanical part, light receiving / light emitting part, circuit part but it may be different depending on the model.
• The mechanical part is composed by shaft, frame, bearing.
• The light receiving / light emitting part are composed by light receiving and light emitting element, disk / mask.
• The circuit part is composed by the circuit which formalizes the signal generated from light receiving element.

Incremental Encoder

The light generated from light emitting element passes through rotating and fixed slit.
The light energy is converted into current through light receiving element and passes through fixed-waved circuit & output circuit and output as two rectangular pulses which have different phase of 1/4 cycle.

• It is output as rectangular waveform depending on the amount of rotating displacement of the shaft.
• The external counter figures out the number of pulses and the amount of rotating displacement is detected.
• You have to set the origin point to find a certain rotating displacement and add the number of pulse from the origin point accumulatively.
• You can add the extra circuit to the output circuit of rotary encoder and improve the electrical resolution by increasing the output pulse 2 times, 4 times.
• You have to find the origin point newly when the power is turned on after power off or power failure.