News Release from Baumer Group International Sales


Wind Industry Profile of

Belt-like flexibility for very large shafts: Flexible magnetic tape encoder for speed and position feedback

Whilst there is a nearly unlimited selection of encoders for small and medium-sized drives, large shafts used to call for expensive specialized solutions such as toothed belt concepts. Now things have changed, there are high-precision encoders easy to install which will fit almost any large shaft of torque motors and generators in the hydro and wind power industry.

By the Hdmag MSGP technology innovation Baumer presents a magnetic encoder platform with flexible magnetic tape to fit almost any large diameter. The customized flexible magnetic tape of predefined circumference will be buckled on the drive or generator shaft just like a belt. By help of the welded fastener the tape is tightened on the shaft and can be quickly exchanged when required. The narrow axial design without torque support will consume only little space on the shaft and by operating on the non-contact sensing principle and by renouncing on any mechanical bearings the encoder will be free from wear and provide a nearly unlimited service life.

To ensure uninterrupted sensing across the fastening gap, the flexible magnetic tape encoder features an integrated dual sensor head and a signal processing unit which is applied for patent. The large permissible tolerances on axial displacement (+/- 5 mm) and air gap (up to 3 mm) ease alignment of the sensor head and in the second place ensure reliable detection unaffected by mechanical backlash and vibrations. The fully encapsulated electronics integrated in the sensor head is optimally protected against soiling, shocks and vibrations. The integrated FPGA-based signal processing allows for very high angular resolutions better than 0.003° respectively more than 100.000 ppr and will remain unaffected by thermal shaft expansion.

“Best Innovation 2010”
Baumer was granted the "Best Innovation 2010" award of ABB Crane Systems for their pioneering innovation in bearingless encoder technology. Unrivaled flexible installation thanks to the capability to fit even the largest shafts and eased adaptation to existing fittings were the hallmark design benefits recognized in the awards ceremony held on "Supplier Day 2011" in Sweden. The non-contact sensing method free from wear excels with ultimate measuring accuracy and longevity and hence will ensure maximum yield for the end customer.

Photo: Belt-like flexibility for very large shafts: Flexible magnetic tape encoder for speed and position feedback. (Photo: Baumer)

Press contact:
Heinrich Greiner
Marketing - Communication
Product Segment Motion Control
Phone +49 (0)7720 942-253

Baumer Group
Heinrich Greiner

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