To that end, the Leine & Linde 600 and 900 series of absolute rotary encoders are available utilizing inductive sensor technology designed for environments where temperature, strong magnetic fields, shock or vibration are extreme. In these applications, encoders using magnetic or optical measurement standards may not support the expected reliability and availability goals.
It is important to note that unlike glass disks which can fracture, plastic disks which can warp or degrade, or magnetic code wheels that can de-magnetize, the inductive code disk in these Leine & Linde encoders is manufactured using robust fiber-composite construction and printed circuit technology. The rotor and stator are of similar construction, and can be separated by relatively large gaps for even greater resistance to shock and vibration.
Technology description: The inductive measurement process is accomplished when an excitation field is generated in the stator, and this field is the modulated by conductive patterns on the rotor. Since this is not an optical process, it is inherently resistant to contamination from oil or grit. Because the rotor and stator scanning fields involve the entire area of both surfaces, the measurement is free of eccentricity errors and can be used to generate quite high resolutions. For example, single-turn resolutions up to 19 bits with turn counting up to 16 bits yields a 35-bit measurement. To put this in perspective, using this technology on a machine tool lead-screw with ½” pitch would provide resolution of about one millionth of an inch over a distance of about ½ mile!
When this form of inductive measurement technology is combined with robust bearing designs and available with explosion-proof enclosures as in Leine & Linde’s 600 and 900 encoder series, the industry standard for harsh environment rotary encoders is raised to the next level.
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