Incremental rotary encoder
5 VDC, 100 - 1 000 ppr | RE series Dunkermotoren GmbH

As standard, brushless DC motors of the BG range are equipped with Hall sensors for measuring current motor speed. Where more stringent demands are placed on the quality of regulation and positioning accuracy, the motors are available with a digital incremental encoder.
Incremental encoders have no sliding contacts and are not subject to wear. A light-emitting diode, a slotted metal disc, and a photo-diode
array form a photoelectric circuit.
An internal logic produces two square-wave signals phased at 90° to each other from the output of the photo-diodes, with or without a reference impulse.
Where the cable length between the motor and encoder is more than 2.5 m,
we recommend use of the RE .. TI, fitted with an additional power booster.
The standard supply voltage for the incremental encoder is 5 VDC. As specials, 24V versions are also available