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A prototype of an [[/electric motor]] with a sensor-free [[/magnetic bearing]]. The magnetic bearing is exposed at one end of the motor. There is a cylindrical magnet fixed to the [[/shaft]] (at each end of the motor). The lifting force is provided by the [[/electromagnet|electromagnets]] (the [[/coil|coils]] with the [[/enamelled wire]]). The information about rotation and shaft position is derived directly from the driving coils, rather than by a dedicated sensor (which is the more common solution). 

The coils are driven in a three-phase system.  

The technology was demonstrated by Institute of Energy Systems and Electrical Drives, Vienna University of Technology at [[Coiltech]] 2015.


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{{tag>Files Magnetic_bearings Bearings}}