7 results on '"Peter Kummeth"'
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2. First Heavy Load Bearing for Industrial Application with Shaft Loads up to 10 kN
- Author
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Joachim Bock, H. Walter, H.-W. Neumueller, Ch Frohne, Wolfgang Nick, W.-R. Canders, Peter Kummeth, K. Schippl, and H. May
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Cryostat ,History ,Engineering ,Bearing (mechanical) ,business.industry ,Stator ,Electrical engineering ,Heavy load ,Mechanical engineering ,Operation temperature ,Computer Science Applications ,Education ,law.invention ,Generator (circuit theory) ,law ,Levitation ,Critical current ,business - Abstract
We report on design, construction and testing of a heavy load HTS bearing for a 4 MVA HTS generator. According to the requirement profile of Siemens the bearing was designed for a shaft weight of 1000 kg. To meet these specifications, Nexans has designed and manufactured a HTS bearing fully encapsulated in a stainless steal cryostat with an operation temperature of −240 °C. The working elements of the bearing are single-domain YBCO monoliths fabricated by a top-seeded-melt-growth process, optimized for large batches with 64 pieces per batch. The monoliths exhibit trapped magnetic fields up to 1.4 T and self-field critical current densities at 77 K up to 1.3 × 105 Acm−2. The stator of the bearing comprises 270 such monoliths, which were arranged in nine rings. The levitation properties of the complete system, comprising the HTS stator and a permanent magnet rotor, were recently successfully tested. The system is the largest bearing manufactured worldwide and one of the first to be tested for industrial applications. more...
- Published
- 2006
- Full Text
- View/download PDF
Catalog
3. Resistive current limiters with YBCO films
- Author
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Peter Kummeth, H.-W. Neumuller, S. Fischer, H.-P. Krämer, Wolfgang Schmidt, Günter Ries, and B. Gromoll
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Cryostat ,Resistive touchscreen ,Materials science ,High-temperature superconductivity ,business.industry ,Liquid nitrogen ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,law.invention ,law ,Fault current limiter ,Limiter ,Optoelectronics ,Electrical and Electronic Engineering ,Current (fluid) ,Power-system protection ,business - Abstract
The aim of this work is to develop a function model of a resistive HTSC fault current limiter. The switching elements of the fault current limiter are bath-cooled in a liquid nitrogen cryostat. The elements consist of YBaCuO films which are deposited on different substrates with critical current densities of up to 3/spl middot/10/sup 6/ A/cm/sup 2/. For the most effective limiting samples so far the peak let-through current was twice tile nominal current and the steady short-circuit current below nominal current. The concept of a 100 kVA function model is introduced. more...
- Published
- 1997
- Full Text
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4. High-temperature-superconducting machines- a high-technology step for large rotating electric machines
- Author
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Wolfgang Nick, Joachim Frauenhofer, Martin Dr. Kaufhold, G. Nerowski, and Peter Kummeth
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Electric machine ,Engineering ,business.product_category ,Superconducting electric machine ,business.industry ,Electrical engineering ,Magnetic bearing ,Magnetic field ,law.invention ,law ,Electromagnetic coil ,Condensed Matter::Superconductivity ,Electric current ,business ,Synchronous motor ,Current density - Abstract
The presently available high temperature superconducting materials (HTS) transport electric current at high current densities with negligible electric losses. This makes it possible to create higher magnetic fields. Using these features in a rotating electric machine it is possible to reduce the over-all dimensions and weight of the machine, to increase the efficiency and to improve additional features of the machine. To address these goals Siemens started three R&D projects to develop, manufacture and test electric machines with high temperature superconducting field windings. A 400 RW synchronous motor was followed up by a 4000 kVA high speed generator. A 4000 kW high-torque motor will be the third step. Additional to the application in electric machines it is possible to use the substantial advantages of high temperature superconducting materials for passive magnetic bearings. These are operating without any control device of the magnetic field. Siemens started the development of heavy load HTS bearings in parallel to the development of HTS machines more...
- Published
- 2006
- Full Text
- View/download PDF
5. Manufacturing and Test of a 100 kVA HTS Transformer
- Author
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Peter Kummeth, Heinz-Werner Neumüller, Reinhard Schlosser, and Cord Albrecht
- Subjects
Engineering ,business.industry ,law ,Electronic engineering ,business ,Transformer ,Automotive engineering ,law.invention - Published
- 2006
- Full Text
- View/download PDF
6. Aspects on HTS applications in confined power grids
- Author
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W. Nick, Wolfgang Schmidt, Jörn Grundmann, A Kuhnert, Tabea Arndt, Peter Kummeth, Christian Schacherer, and Marijn Pieter Oomen
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business.industry ,Metals and Alloys ,Electrical engineering ,Topology (electrical circuits) ,Condensed Matter Physics ,Grid ,Power (physics) ,Power flow ,Distributed generation ,Materials Chemistry ,Ceramics and Composites ,Power grid ,Electric power ,Electric potential ,Electrical and Electronic Engineering ,business ,Computer Science::Distributed, Parallel, and Cluster Computing - Abstract
In an increasing number of electric power grids the share of distributed energy generation is also increasing. The grids have to cope with a considerable change of power flow, which has an impact on the optimum topology of the grids and sub-grids (high-voltage, medium-voltage and low-voltage sub-grids) and the size of quasi-autonomous grid sections. Furthermore the stability of grids is influenced by its size. Thus special benefits of HTS applications in the power grid might become most visible in confined power grids. more...
- Published
- 2014
- Full Text
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7. Development and construction of an HTS rotor for ship propulsion application
- Author
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Peter Kummeth, M. Frank, J J Rabbers, M Wilke, K. Schleicher, and Wolfgang Nick
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History ,Engineering ,Rotor (electric) ,Stator ,business.industry ,Siemens ,Electrical engineering ,Propulsion ,Automotive engineering ,Computer Science Applications ,Education ,law.invention ,Power (physics) ,Generator (circuit theory) ,Task (computing) ,law ,Electromagnetic coil ,business - Abstract
A low-speed high-torque HTS machine is being developed at Siemens on the basis of previous steps (400kW demonstrator, 4MVA generator). The goal of the programme is to utilize the characteristic advantages offered by electrical machines with HTS-excited rotor, such as efficiency, compact size, and dynamic performance. To be able to address future markets, requirements from ship classification as well as potential customers have to be met. Electromagnetic design cannot be focused on nominal operation only, but has to deal with failure modes like short circuit too. Utilization of superconductor requires to consider margins taking into account that the windings have to operate reliably not only in "clean" laboratory conditions, but in rough environment with the stator connected to a power converter. Extensive quality control is needed to ensure homogenous performance (current capacity, electrical insulation, dimensions) for the large quantity of HTS (45 km). The next step was to set up and operate a small-scale "industrial" manufacturing process to produce HTS windings in a reproducible way, including tests at operating conditions. A HTS rotor includes many more components compared to a conventional one, so tough geometric tolerances must be met to ensure robust performance of the system. All this gives a challenging task, which will be concluded by cold testing of the rotor in a test facility. Then the rotor will be delivered for assembly to the stator. In following machine tests the performance of the innovative HTS drive system will be demonstrated. more...
- Published
- 2010
- Full Text
- View/download PDF
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