Sökning: "bearing loss"

Visar resultat 1 - 5 av 73 avhandlingar innehållade orden bearing loss.

1. 1. Design and analysis of a novel low loss homopolar electrodynamic bearing

   Författare :Torbjörn A. Lembke; Chandur Sadarangani; Hannes Bleuler; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical engineering; Homopolar bearing; Electrodynamic bearing; Induction bearing; Elektroteknik; Electrical engineering; Elektroteknik;

   Sammanfattning : A novel homopolar electrodynamic bearing, together with a suitable permanent magnet drive, have been developed for high-speed applications where low losses and high reliability are essential and exclude the use of ball bearings, and yet where active magnetic bearings offer a too complex system solution. Considered applications are small turbomolecular vacuum pumps, and maintenance free flywheels for energy storage in remote telecom and satellite systems. LÄS MER

3. 2. Analysis and Verification of a Slotless Permanent Magnet Motor for High Speed Applications

   Författare :Jörgen Engström; KTH; []
   Nyckelord :slotless motor; airgap winding; permanent magnets; high speed; axial leakage; rotor sleeve losses; harmonic inductance; bearing loss; windage loss; end shield loss;

   Sammanfattning : .... LÄS MER

4. 3. I vinst och förlust : Köpmäns nätverk i 1500-talets Östersjöstäder

   Författare :Lovisa Olsson; Martin Wottle; Thomas Småberg; Dag Lindström; Södertörns högskola; []
   Nyckelord :HUMANIORA; HUMANITIES; Trade; Early modern history; Baltic Sea region; Credit networks; Urban history; Embedded economy; Network analysis; Town councils; Spatiality; Mobility; Economic history; Handel; Tidigmodern historia; Östersjöregionen; Kreditnätverk; Urbanhistoria; Inbäddad ekonomi; Nätverksanalys; Städernas råd; Spatialitet; Mobilitet; Ekonomisk historia; Historical Studies; Historiska studier; Östersjö- och Östeuropaforskning; Baltic and East European studies;

   Sammanfattning : This thesis aims to clarify how the merchant networks involved in the trade across the Baltic Sea interplayed with and contributed to create the economic culture of the Baltic Sea region. This is achieved by examining the economic, social, spatial and political aspects of the trade networks in relation to the social organisation of the early modern towns of Stockholm, Lübeck, Malmö and Reval (Tallinn) in the 16th century. LÄS MER

5. 4. Osteoarthritis of the Hip and Uncemented Total Hip Arthroplasty : Effects of Immediate Weight Bearing on Implant Stability, Bone Mineral Density, and Body Composition

   Författare :Olof Wolf; Hans Mallmin; Sune Larsson; Jan Milbrink; Per Mattsson; Per Adolphson; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Osteoarthritis of the hip; uncemented; total hip arthroplasty; stability; RSA; BMD; DXA; body composition; weight bearing; Orthopaedics; Ortopedi; Orthopaedics; Ortopedi;

   Sammanfattning : The initial recommendation for the postoperative regime after uncemented total hip arthroplasty (THA) was 6-12 weeks of partial weight bearing (PWB) to obtain a stable implant position during bone ingrowth. In recent years patients with uncemented THA have increasingly practiced full weight bearing (FWB) after surgery, which has largely been based on clinical experience rather than on scientific evidence. LÄS MER

7. 5. Slotless High-Performance Electric Drives : Harmonic Loss Analysis, Sensorless Control, and Inverter Design

   Författare :Jonas Millinger; Oskar Wallmark; Juliette Soulard; Zi-Qiang Zhu; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite-element analysis; harmonic losses; sensorless control; slotless motor drives; thermal modeling; wide-bandgap inverter; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Electric motor drives are a cornerstone for many fundamental functions in today’s society, and their expected dominance within the transport sector is considered one of the main keys to abate global warming. Subsequently, the incentives for improved performance of electric motor drives cannot be sufficiently emphasized. LÄS MER