US Digital HB6M Hollow Bore Optical Encoder (Rotary)

The HB6M is a high resolution hollow bore (hollow shaft / thru-bore) optical encoder with a machined aluminum enclosure and a clear anodized protective finish. The HB6M optical incremental encoder is designed to easily mount to an existing shaft to provide digital feedback information for any motion control application.

Typical applications include servo motor feedback, web process control, robotics, flux vector feedback, high power motors, textile machines and elevator controls.

The HB6M bearing style encoder features a hollow bore that accepts shaft diameters of 0.250" to 0.750" in diameter. The encoder slips over the shaft and is locked into place with two 6-32 set screws. A flexible anti-rotation tether compensates for shaft run out of up to 0.030" axial and 0.010" TIR. The flexible tether provides single point mounting for bolt circles from 2.50" up to 5.00".

The HB6M housing comes standard with a closed cover to limit particle ingress or an optional hole in the body to allow a shaft to pass completely through the encoder.

The mating connector is polarized and latches into the encoder. Depressing the latch tab allows the connector to be unplugged. Mating connector assemblies are available from US Digital stock.

The differential version has an internal differential line driver (26C31) that can source and sink 20mA at TTL levels. The cable that connects to this encoder should have 3 twisted pairs for the data channels plus power and ground. Group each pair of differential signals. The recommended receiver is industry standard 26C32. Maximum noise immunity is achieved when the differential receiver is terminated with a 150Ω resistor in series with a 0.0047µF capacitor placed across each differential pair. The capacitor simply conserves power; otherwise power consumption would increase by 20mA per pair, or 60mA for 3 pairs.

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