Bearing-less Hollow Shaft Encoder

Easy attachment even to the larges WEA-driving shaft

  • Wear-free magnetic hollow shaft encoders
  • Inner diameter of up to 740 mm
  • Rugged and vibration-proof sensing principle


There is a trend towards slow speed in motors and generators. Requiring limited gear stages, sometimes even no gearbox at all, these motors save costs and energy. However, low speed calls for higher torque to end up with the same yield of transmitted power. Large machines often provide giant shafts that in the past nearly could not be matched by the encoders available on the market. But now things are different.

HDmag is the name of the Baumer encoder series of wear-free magnetic hollow shaft encoders featuring inner diameters of up to max. 740 mm (fig. 1). Specifically conceived for large motor and generator shafts, they open up new solutions. The encoders feature an encoder wheel that is attached right away at the drive shaft and a separate sensor head. A magnetic scale fitted on the outside of the encoder wheel is sensed tangentially. It is covered with a bandage to provide additional protection. The encoders are mounted straight to the hub, and thanks to the narrow axial design and without torque support they consume only minimal installation space on the shaft. The bearing-less design ensures wear-free operation for years. The noncontact sensing principle of the HDmag encoders is capable of wide radial and axial gap tolerances of up to 3 mm between encoder wheel and sensing unit to equalize thermal and mechanical backlash and to ease installation and enhance operational safety.

The encoder wheel provides 524288 pulses per revolution. The signal processing integrated in the sensor head enables optional generation of square signals (HTL or TTL) or sine/cosine signals, latter with max. 32768 periods per revolution. The absolute encoder configuration provides a 17 bit resolution. The fully encapsulated electronics in the sensor head is optimally protected against soiling, shocks and vibration. Presently shaft diameters of maximum 740 mm are available, but even larger diameters are technically feasible. The Baumer HDmag encoder series endures even the harshest environments that prevail in drive´engineering or the wind power industry.

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