Planetary Backup Bearings for Flywheel Applications
High-speed flywheels can be used as kinetic energy storages for electrical energy.To increase the energy density of the flywheel,an outer rotor type flywheel can be utilized.The fly-wheels are supported by magnetic bearings and operated in vacuum conditions to provide a high efficiency.Backup bearings are needed to support the rotor in case of a malfunction of the magnetic bearings.However,since conventional backup bearings are not available for the high surface velocities above 200 m/s of the outer rotor type flywheels,a planetary backup bearing design was introduced.The present study investigates the experimental results of two test series conducted with a planetary backup bearing test rig.The rotor having similar properties to the outer rotor type fly-wheel was consecutively delevitated at rotational speeds of 1 – 20 krpm.In order to assess the severity of the delevitation events position,rotational speed,force,and thermal data were evaluated.The advancing wear of the planetary backup bearing was assessed with multiple methods.During the first test series,the rotor was mostly relevitated a few seconds after the drop-down.The second test series consisted only of full run-downs and led to a bearing failure.The results suggest that the planetary backup bearing is feasible in the proposed application.Multiple full run-downs were possible with neither unwanted rotor-stator contact nor damage to the rotor,magnetic bearings or electric machine.The proposed indicators were found to be applicable in the planetary backup bearing life-time assessment.The future work includes the experimental investigation of the planetary backup bearing in a full-scale outer rotor type kinetic energy storage.
Lukas Quurck Raine Viitala Daniel Franz Stephan Rinderknecht
Institute for Mechatronic Systems in Mechanical Engineering(IMS),Technical University Darmstadt Otto Aalto University School of Engineering,Department of Mechanical Engineering S(a)hk(o)miehentie 4P,P.
国际会议
the 16th International Symposium on Magnetic Bearings (第十六届国际磁悬浮轴承大会) (ISMB6)
北京
英文
1-9
2018-08-13（万方平台首次上网日期，不代表论文的发表时间）