Technology of Kinetic Energy Storage Systems

Flywheels are the oldest known kind of energy storage. Nowadays, kinetic energy storage systems are used only in niche applications. The high complexity of the systems resulting in high investment costs and difficult loss mechanisms aggravate a broader economic application.

Hence higher energy content can be achieved by increasing the moment of inertia or the revolution speed. The usage of magnetic bearings and vacuum environments enable high revolution speeds (up to 30,000 rpm to 60,000 rpm) and furthermore enable the decrease of losses as well as wear and tear. The maximum revolution speed is limited by mechanic tension inside the flywheel caused by centrifugal forces, calling for fiber-plastic composites.

Picture: IMS

Our research objective is to enhance the economic feasibility of kinetic energy storage systems by improving the energy- and power density as well as reducing energy losses and system complexity. Novel concepts are developed and tested in real-world applications.

Completed projects related to this key topic:

funded by BMWi, Period: 2015-2018

In this project, specific components of the kinetic energy storage systems, as for example the fiber composite rotor, the magnetic bearings and the touch-down bearings, are particularly investigated and further developed.

Contact: Daniel Franz,

Further information you can find on the Project webseite.

funded by BMWi, Period: 2013-2017

As a part of the Fabrik-Project, a specialized for the industrial use Kinetic Energy Storage System in outer rotor form is developed and tested.

Contact: P. Mouratidis, ; B. Schüßler,

Further information you can find on the Project website.

funded by BMWi, period 2014-2017

Target of the project “Siedlungsbausteine für bestehende Wohnquartiere – Impulse zur Vernetzung energieeffizienter Technologien” (Modules for existing residential quarters – Impulse for the interconnection of energy efficient technologies) is the development and intelligent integration of a hybrid energy storage system consisting of a refined flywheel in combination with a Li-Ion battery.

Contact: Maximilian Schneider,

Further information you can find on the Project website.

funded by Hessenagentur: HA-Projekt-Nr.: 327/12-17, Period: 2012-2014

This project ran in the framework of Hessen ModellProjekte with funds of LOEWE – Landes-Offensive zur Entwicklung Wissenschaftlich-ökonomischer Exzellenz, Förderlinie 3: KMU-Verbundvorhaben (State Offensive for the Development of Scientific and Economic Excellence).
Therewith, the first flywheel prototype in outor-rotor design was developed and built.