A company of Schneider Electric

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Submersible Absolute Linear Encoder

Developed to meet a wide range of feedback applications, Newall’s Spherosyn™ Absolute encoder offers accuracy
down to 3 micron and resolutions to 0.1 micron. With a
travel length of 9.25 meters and a traverse rate of up to 60 meters per second, the encoder is ideally suited for linear motor and other high velocity measurement applications, including CNC Feedback, pick and place machines, automotive transfer lines, packaging machines, printing machines, PC-based systems (no interface cards required), and more.

The Spherosyn™ Absolute encoder provides a true absolute position immediately upon power-up. The encoder does not use batteries or static memory to retain the positional data. True position can be reacquired once power is applied, regardless of duration or power-off movements.

Like all of Newall’s linear encoders, the Spherosyn™ Absolute is completely sealed and comes with an IP67 environmental rating (fully submersible). The encoder is tolerant to vibration and shock, easy to install, and requires no machined surface, backer bar, air purge, regular maintenance or cleaning.

Based on Newall’s established Spherosyn™ technology, the absolute encoders are made up of two components, the reader head and the scale. The scale is comprised of a stainless steel tube that houses a column of precision nickel-chrome ball bearings. The ball bearings are maintained under a calibrated pre-load to ensure accurate pitch spacing. Coded inserts are placed between the ball bearings in such a manner as not to interfere with the geometry of the ball-to-ball contact.

The aluminum cast reader head, contains a coil assembly, the supporting electronics and a sensor array that detect the target that is embedded in the coded scale inserts. An LED is mounted to the surface of  the reader head to simplify the installation and provide a visual feedback of the encoder operating status. The cavity of the reader head is filled with an epoxy resin that fully seals the electronics.

A high-speed Digital-Signal-Processor (DSP) is utilized in order to process the positional data and to communicate output protocols such as SSI (Pure Binary or Gray Code), CAN, RS232, RS485/RS422 and distance coded (Fanuc Serial Interface pending). Contact Newall for other protocols and field bus interfaces.