Avancerad sökning

Visar resultat 1 - 5 av 249 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Iron Losses in Electrical Machines - Influence of Material Properties, Manufacturing Processes, and Inverter Operation

   Författare :Andreas Krings; Juliette Soulard; Oskar Wallmark; Annette Mütze; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; AC machines; cobalt-iron; eddy current losses; electrical steel sheets; inverter-fed machines; iron alloys; iron loss measurements; machine design; magnetic hysteresis; magnetic losses; magnetic materials; nickel-iron; permanent magnet machines; silicon-iron; soft magnetic composites; slot-less machines; soft magnetic materials; thermal effects.; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : As the major electricity consumer, electrical machines play a key role for global energy savings. Machine manufacturers put considerable efforts into the development of more efficient electrical machines for loss reduction and higher power density achievements. LÄS MER

3. 2. Heat-transfer simulations applied to electrical machines

   Författare :Kristian Rönnberg; Christophe Duwig; Jens Walther; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; energy efficiency; heat transfer; electric machines; high fidelity simulation; modal analysis; Engineering Mechanics; Teknisk mekanik; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Electrification and energy efficiency are two important aspects in present scenarios describing a sustainable future. Electric motors constitute a large fractionof industry’s electricity demand today, and it is expected to remain high inthe future. LÄS MER

4. 3. Testing and Modelling of Electrical Traction Machines : Performance Characterisation with Measurements from Transient Operation

   Författare :Sebastian Hall; Industriell elektroteknik och automation; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical machines; Interior permanent magnet synchronous machines IPMSMs ; characterisation; Testing; Modelling; Electrical machines; Interior permanent magnet synchronous machines IPMSMs ; Testing; Characterisation; Modelling;

   Sammanfattning : This thesis presents methods to derive and model the performance characteristics of interior permanent magnet machines – a machine type which is commonly used for propulsion of electrical vehicles. The thesis divides the performance characteristics into three subcategories: The electromagnetic properties, the loss profile and the thermal behaviour of the machines. LÄS MER

5. 4. Thermal Analysis and Management of High-Performance Electrical Machines

   Författare :Shafigh Nategh; Chandur Sadarangani; Aldo Boglietti; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Computational fluid dynamics; directly cooled electric machines; finite element analysis; heat transfer; hybrid electric vehicle; induction machines; lumped-parameter thermal model; permanent-magnet assisted synchronous reluctance machines.;

   Sammanfattning : This thesis deals with thermal management aspects of electric machinery used in high-performance  applications  with  particular  focus put  on electric machines designed for hybrid electric vehicle applications.In the first part of this thesis,  new thermal models of liquid (water and oil) cooled electric machines are proposed. LÄS MER

7. 5. Optimum design of electrical machines

   Författare :O. W. Andersen; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : .... LÄS MER