Sökning: "stator"

Visar resultat 16 - 20 av 126 avhandlingar innehållade ordet stator.

1. 16. A Generator Perspective on Vertical Axis Wind Turbines

   Författare :Fredrik Bülow; Hans Bernhoff; Jens Sørensen; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; VAWT; PM generator; Wind power; Stator core loss;

   Sammanfattning : The wind energy conversion system considered in this thesis is based on a vertical axis wind turbine with a cable wound direct drive PM generator. Diode rectifiers are used to connect several such units to a single DC-bus and a single inverter controls the power flow from the DC-bus to a utility grid. LÄS MER

3. 17. Linear wave energy converter : Study of electromagnetic design

   Författare :Erik Lejerskog; Mats Leijon; Giuseppe Passoni; Uppsala universitet; []
   Nyckelord :Wave energy; permanent magnets; linear generator; closed stator slots; offshore experiments;

   Sammanfattning : The thesis presents results from synchronous linear wave energy converters developed at Uppsala University. A study is done on closed stator slots and a study presenting offshore data focusing on the power absorption from a wave energy converter (WEC). LÄS MER

4. 18. Turbomachinery Aeroacoustic Calculations using a Time Domain Chorochronic Method

   Författare :Martin Olausson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rotor Stator interaction; Fan-Noise; Time lag; Chorochronic; Nonlinear; Computational Aeroacoustics;

   Sammanfattning : Noise regulations for aircrafts that fly over populated areas are continuously becoming stricter. This in combination with increasing computational capabilities has boosted interest in aeroacoustic computations in the aerospace industry. LÄS MER

5. 19. Theoretical and Experimental Analysis of Operational Wave Energy Converters

   Författare :Erik Lejerskog; Mats Leijon; Rafael Waters; John Ringwood; Uppsala universitet; []
   Nyckelord :ocean wave energy; WEC; permanent magnet; linear generator; closed stator slots; offshore experiments;

   Sammanfattning : This thesis studies wave energy converters developed at Uppsala University. The wave energy converters are of point absorbing type with direct driven linear generators. The aim has been to study generator design with closed stator slots as well as offshore experimental studies. LÄS MER

7. 20. Turbomachinery Aeroacoustic Calculations using Nonlinear Methods

   Författare :Martin Olausson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nonlinear; CFD; Time Spectral; CAA; Ffowcs-Williams Hawkings; Broadband; Time lag; Computational Aeroacoustics; Fan-Noise; Rotor-Stator interaction; Buffer layer; Oscillating sphere; Newton-GMRES; Computational Fluid Dynamics; Acoustic analogies; Sponge; Counter-Rotating Propfan; Harmonic Balance Technique; Tone; FWH; Chorochronic periodicity; Hybrid RANS LES;

   Sammanfattning : Noise regulations for aircraft that fly over populated areas are becoming continuously stricter. This in combination with increasing computational capabilities has boosted interest in aeroacoustic computations in the aerospace industry. LÄS MER