Self-compensating permanent magnet bearing
High axial load rotating systems: flywheel and turbine
Permanent magnet bearings provide a magnetic force between a rotor and a stator of rotating system. These bearings can be used to relieve the load of on mechanical bearings within an hybrid system to increase the lifetime of the mechanical bearings, and to decrease the losses inside the system. However, properties of permanent magnets are not constant and depend on operating temperature and demagnetization due aging. This change of properties result in a variation of the magnetic force taking place in permanent magnet bearings.
The UCL invention
The new device developed allows maintaining constant levitation force even when the operating temperature varies or due to ageing of magnet. The solution consists in a deformable cavity containing a fluid under constant pressure and able to move in response to a change of permanent magnets properties, thus maintaining levitation force constant.
TRL 4 Prototype has been tested and functionality have been demonstrated over a limited range of operating conditions.
IPR This work was the subject of an EP patent application filed on the 10th of August 2018 (EP18188404).
Joint developments, licensing opportunities
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