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Bearing-less, large shaft mounted optical incremental encoder

12 March 2013

Leine and Linde’s new 2000 series bearing-less optical encoders, available in the UK from Mclennan Servo Supplies, can be used on shaft diameters up to one metre.

For certain plant and machinery automation applications, where precision speed feedback control is required for large diameter drive shafts or where a large aperture through a rotating machine is desirable, Leine and Linde’s new 2000 series bearing-less optical encoders can provide a neat solution.

Available in the UK from Mclennan Servo Supplies the encoder can be used on shaft diameters up to one metre, and with a radial air gap requirement of up to 2.6 mm between the ring and the separate measuring head, it can accommodate large shaft run-out as well as high levels of shock and vibration.

Furthermore the construction of the ring, which is supplied in sections that are precision clamped around the shaft, facilitates straightforward assembly on the machine. The separate encoder ring segments can be fixed by face mounting to a flange with axial screws or with a special ‘ClampFit’ solution that automatically tightens the complete ring encoder around the mating shaft without the need for a flange.

With both assembly methods performed in-situ, there is no need for complex assembly and the ClampFit method particularly suits retrofitting precision speed control on existing machinery.

The speed pickup/measurement unit is available with several standard interfaces for incremental signal output. In particular, High Current HTL and Optolink suit long distance transmission, making them appropriate for process plant installations where control cabinets are often isolated far away from the machinery.

As part of its custom control and engineered system capability, Mclennan can help with specific applications for the new Leine and Linde 2000 series bearing-less encoders.

Examples of application areas for the range may include integrated use with large diameter brushless torque motors from another Mclennan distribution partner, Emoteq Inc – a part of the Allied Motion Technology Group.

These large aperture ‘Thin Ring’ frameless motors are supplied as separate rotor and stator units. They are available in eight frame sizes with outer/inner diameters from 170/95 mm to 792/620 mm, with larger frame dimensions on request as custom designs.

With continuous stall torque from 3 Nm to over 2 kNm, the compact motor length through the standard range is demonstrated by just 123 mm for the largest frame version. The Megaflux motor technology is well proven in many high technology applications such as laser scanning & printing machinery, machine tool axis drives, semiconductor manufacturing, robot base & joints, and many more.

Mclennan works closely with a small number of global motion control manufacturers and offers a complete range of brushed and brushless servo motors, stepper motors and complementary drive technologies together with motion controls.

With its own in-house design and manufacturing assembly facilities, the Hampshire based motion specialist supplies component level solutions as well as complete integrated mechatronics assemblies with customised mechanics, gearheads and other power train components.

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