Compact, heavy-duty encoder

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Third Quarter 2005 Other technologies

Kübler's new A02H series of heavy incremental encoders with large hollow-shaft fills an important gap in the market. Traditional heavy-duty incremental encoders have tended to be large and cumbersome in design and often expensive to buy. This type of special encoder can handle all sorts of extreme applications imaginable, but in practice many applications with cranes, in drives in the steel industry or in general heavy machinery only require heavy duty encoders that offer a sensible compromise between the cost of purchase and the performance. The widespread practice of over-engineering needs to be kept in check. To achieve this goal many users up till now have been installing standard encoders with a large hollow shaft - with questionable success. These products are not designed for high loads on their bearings, shocks and high rotation speeds, so the rate of failure is naturally unacceptably high.

Kübler's new heavy-duty encoders solve these problems. Their overall depth is up to three times shorter than traditional heavy-duty devices, yet they are many times more robust than standard hollow shaft encoders. The user can thus save on expensive installation in or on drives and can avoid high failure rates. The new A02H series is a heavy-duty hollow shaft encoder with a bore of up to 42 mm diameter. The overall depth however is a mere 50 mm at most.

The clever mechanical construction avoids any axial displacement of the hollow shaft, caused by heavy axial impacts, for example. This eliminates 90% of current encoder failures. The high-grade stainless steel hub-shaft fixing has been balanced, which supports the high continuous rotating speed of up to 6000 rpm offered by this new family of encoders.

All the devices come with UL approval as standard and can also be delivered in an explosion-proof version (zones 2 and 22). Resistance to shock is at least 200 g/6 ms. A wide range of mechanical accessories is available for fixing the encoders. In addition, the manufacturer also offers customised fixing solutions for special projects. As far as the electronics is concerned, the encoders are available either for 5 V d.c. with RS422 output or for 10 to 30 V d.c. with push-pull output as well as with sinusoidal output, with 1 Vss for either 5 V d.c. or 10 to 30 V d.c. supply.

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Compact, heavy-duty encoder

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