Permanent magnet bearing for axial rotor load compensation
(2019)
Files
MVB_thesis_compressed.pdf
Open Access - Adobe PDF
- 7.12 MB
Details
- Authors
- Supervisors
- Dehez, Bruno
- Abstract
- In applications with high axial load, the constraints imposed on the mechanical thrust bearings limit the service life of the system and lead to significant maintenance and repair costs. In addition, this load results in high friction losses reducing the efficiency of the system. In order to relieve this axial force and to increase the lifetime and energy efficiency, a permanent magnet bearing is used as axial load compensator. Permanent magnet bearings used as load relievers are useful for various applications such as hydro turbines, vertical axis wind turbines, or flywheel energy storage systems. However knowing the challenges in the supply of permanent magnets, their rational and efficient use is critical. This thesis provides different tools to help designers to integrate permanent magnet bearings working as axial rotor load compensators. To this end, this work first compares axisymmetric bearing topologies based on dimensions maximizing the force per permanent magnet volume. Then, wide range of permanent magnet materials are compared based on their ability to withstand demagnetization and temperature effects. Nevertheless, magnetic bearings can suffer a loss of performances due to temperature and aging effects on the permanent magnet material. An original solution is proposed to compensate passively these negative effects. Finally, practical implementations are carried out in the context of a flywheel electrical energy storage system and allow to validate experimentally the expected performance.
- Affiliations
Citations
Van Beneden, M. (2019). Permanent magnet bearing for axial rotor load compensation. https://hdl.handle.net/2078.5/62965