US Digital

The HB5M is a hollow bore (hollow shaft / thru-bore) optical encoder with a machined aluminum enclosure and a clear anodized protective finish. The HB5M optical incremental encoder is designed to easily mount to an existing shaft to provide digital feedback information for any motion control application.  The HB6M has a compliant mounting method that makes it more tolerant of radial and axial shaft runout than a standard kit encoder.

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

The HB5M bearing style encoder features a hollow bore that accepts shaft diameters of 5mm to 8mm in diameter. The encoder slips over the shaft and is locked into place with two 4-40 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 mounting for two 4-40 machine screws on a 1.812" bolt circle.

The HB5M 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. Custom cables are also readily available (see the Cables / Connectors page).

The differential version has an internal differential line driver (26C31) attached to the encoder module 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 110 Ohms resistor in series with a 0.0047f 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.