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Emerald Group Publishing Limited
Copyright © 2011, Emerald Group Publishing Limited
Low-cost kit-form absolute encoder suits rotary and linear position feedback
Article Type: Mini features From: Assembly Automation, Volume 31, Issue 2
High-resolution absolute encoder provides 16-bit output for rotary or linear positioning in very compact size
Mclennan Servo Supplies has introduced a new low-cost absolute encoder system in a very compact kit-form that suits both rotary and linear motion applications. The new NEMO3 encoders from NUMERIK JENA are aimed at OEMs and machine builders that require space saving and inexpensive high-resolution absolute position feedback integrated directly into their machines.
With analogue or digital output, the encoder consists of a separate reading head and code data disk or linear scale with specially developed chrome-on-plastic (COP™) printing technology in a gray code pattern that will provide a 16-bit rotary position output over 360° or up to 2 μm linear position output. An optional rotary version can include up to 11-bit user-defined code patterns. Discs are available in standard formats from 26 to 42 mm in diameter and linear scales are supplied according to the length of travel required. High-temperature versions are available for use up to +85°C.
The reading head is powered from a user supplied 5 VDC and includes the collimated illumination module for 11 data tracks and two sin/cos tracks that provides a true differential output with 1,024 periods plus amplitude and offset error compensation. The measuring system uses a 16 MHz serial clock and can return information at a 1 ms rate for high-speed position feedback. An on-chip EEPROM stores calibration and configuration data so once set up, the encoder is a fit and forget solution.
The compact reading head is available in a standard version with all components mounted on a support frame or in a “Super Flat” design with a separate illumination module for extremely compact installations.
The MEMO3 is aimed at applications such as medical and processing equipment where absolute position feedback is critical and where set up datum routines associated with incremental encoders are not tolerated.
Mclennan Servo Supplies can supply the NEMO3 separately or as a part of systems solutions including servo or stepper motors, gearboxes, motion controllers and drive electronics, and other mechanical components as customised mechatronics solutions. For more information, please visit the web site: www.mclennan.co.uk