Bearing-less encoder rings ideal for heavy-duty applications

Some motors require a speed feedback sensor mounted on the main shaft between other parts in the machinery. Here the shaft dimensions may be large — sometimes around a metre — which means that a standard optical encoder is not suitable. Leine & Linde’s 2000 series bearing-less encoder rings for large shafts fits the bill. 

The encoder rings are designed to meet the demands found in heavy industries. For example, in heavy-duty applications, the motor often handles heavy mechanics and may be exposed to powerful shocks and vibrations, something that will result in a certain runout of the shaft. Leine & Linde’s 2000 series features a tolerated air gap between the rotating ring and the fix scanning unit. With an accepted air gap of up to 2.6 mm, the 2000 series offers several times better performance than most ring products found on the market. 

The Leine & Linde ring is segmented into pieces, something that facilitates commissioning and service. As the ring is often mounted on a shaft between other parts in the machinery, it may be difficult to access it, both when first mounting it and when performing service. With a segmented ring, the pieces may be mounted from two sides of the shaft and screwed together. Fixing the ring to the shaft can be made through flange mounting with axial screws or by Leine & Linde’s ClampFit solution for simplified commissioning. With ClampFit, the ring segments are screwed together in a way that automatically tightens the ring around the mating shaft. This saves commissioning time and enables fixing to a standard cylindrical shaft without any flange expansion prepared. 

The speed pickup unit is available with several market standard interfaces for incremental signals. The interfaces High Current HTL and Optolink have been specially designed for long distance transmission, something that makes them suitable for installations in the process industry where very long cables may be needed to reach out to each encoder in the factory. The company is also able to develop customized solutions based on a customer’s specific needs.

Leine & Linde’s 2000 series bearing-less encoder rings are available through Pickering, Ont.-based Durham Instruments. Contact Durham Instruments to learn more. 

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