DiSKo-HT

This project focuses on minimizing losses in high-temperature heat pumps (HTWP)-relevant drive and compressor power by dispensing with a gearbox. To achieve this goal, new high-speed motors will be developed by SciMo - Elektrische Hochleistungsantriebe GmbH and directly connected to a turbo compressor from Kompressorenbau Bannewitz GmbH . The consortium will demonstrate and analyse the power scaling of the high-speed motors to 250 kW by means of stacking. To carry out this task realistically, the stacked drive must be connected to a corresponding compressor and the entire machine must be developed as a single unit. Based on this, the fundamental investigations into vibration behaviour and rotor dynamics can be carried out, problem areas identified and solutions developed by the Chair of Structural Mechanics and Vehicle Vibrations at the Brandenburg University of Technology Cottbus-Senftenberg. The starting point for the development of the compressor in this project is a radial compressor from a series-produced turbocharger for medium-speed large engines from KBB. The project also aims to replace the turbine of the exhaust gas turbocharger with an electric direct drive. In this way, relatively low unit costs can be achieved based on the series product with minor application-related adaptations. Due to the typical maximum compression end temperatures of around 200 °C, a special aluminium alloy is used as standard for exhaust gas turbocharger compressor wheels for large engines. In the project, however, final compression temperatures of 300°C are targeted. Aluminium alloys can no longer be used for these requirements. For this reason, a material substitution to a significantly more robust titanium alloy is required. Regardless of whether the bearing pedestal near the compressor contains the thrust bearing or not, it must fullfil other functions in addition to absorbing the forces and torques. Among other things, the motors are thermally decoupled from the compressor by the intermediate bearing pedestal. In addition, the various cooling and lubrication media must be supplied and discharged. The resulting compression system will be installed and tested in the existing DLR pilot plant in Cottbus at the end of the project. This will be a further step towards the technological maturity of the developed unit.