Electric machine having a passive axial electrodynamic bearing
Prototype on test bench
Self-bearing motors for high-speed applications
Self-bearing motors are under development to respond to issues related to compactness and high spin speed operation. To date, their structures are based on the active control of the currents as a function of the rotor position. As a result, these motors require power electronics, controllers and sensors, thus reducing the reliability and increasing the cost and complexity
The UCL invention
Our new device consists in a passively self-levitated axial flux permanent magnet motor in which the permanent magnets and the windings interact, as in classical machines, to produce a driving torque. However, the windings also present a short-circuited path within which currents are passively induced when there is a rotor axial out-centering. By their interaction with the permanent magnets, these currents generate a restoring thrust force in the absence of any control regarding the axial position.
TRL 4 Prototype has been tested and functionality has been demonstrated over a limited range of operating conditions.
IPR This work was the subject of a PCT patent application filed on the 18th of May 2018 (PCT/EP2018/063174).
Joint developments, licensing opportunities
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