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Drop-Downs of an Outer Rotor Flywheel in Different Planetary Touch-Down Bearing Designs

Schüßler, Benedikt ; Hopf, Timo ; Rinderknecht, Stephan (2022):
Drop-Downs of an Outer Rotor Flywheel in Different Planetary Touch-Down Bearing Designs. (Publisher's Version)
In: Actuators, 11 (2), MDPI, e-ISSN 2076-0825,
DOI: 10.26083/tuprints-00021226,
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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Drop-Downs of an Outer Rotor Flywheel in Different Planetary Touch-Down Bearing Designs
Language: English
Abstract:

With an increase in renewable energy in the electricity grid, more storage capacity for grid stabilization and energy flexibilization is necessary. Dynamic grid stabilization is one possible application for flywheels. To increase the energy density of flywheels, they can be built as highly integrated outer rotor systems. The losses of the flywheel are reduced by magnetic levitation and operation under vacuum conditions. In the case of the failure or overload of the active magnetic bearings, the system needs touch-down bearings to prevent system destruction. Planetary touch-down bearings consisting of several small bearing units circumferentially distributed around the stator are especially suited for these systems. In the literature, these planetary touch-down bearings are rarely investigated, especially the number of bearing units. Therefore, this paper investigates the influence of the number of touch-down bearing elements in simulations and experiments for an 8-element and a 6-element touch-down bearing arrangement. For the investigation, drop-downs at four different speeds were performed. Simulation and experimental results showed that, for the 6-element touch-down bearing, in contrast to the 8-element touch-down bearing, maximal velocity did not increase with the drop-down speed. Therefore, the touch-down bearing arrangement with fewer elements is preferrable.

Journal or Publication Title: Actuators
Volume of the journal: 11
Issue Number: 2
Publisher: MDPI
Collation: 16 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
Divisions: 16 Department of Mechanical Engineering > Institute for Mechatronic Systems in Mechanical Engineering (IMS)
Date Deposited: 03 May 2022 11:18
Last Modified: 03 May 2022 11:18
DOI: 10.26083/tuprints-00021226
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-212260
Additional Information:

Keywords: flywheel; energy storage; outer rotor; drop-down; touch-down bearing; backup bearing; catcher bearing; auxiliary bearing; vacuum

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21226
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