Sökning: "stator"

Visar resultat 1 - 5 av 111 avhandlingar innehållade ordet stator.

  1. 1. Partial discharges detected by stator slot couplers

    Författare :Jörgen Blennow; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PD; statistical analysis; attentuation; on-line; SSC; partial discharges; stator slot couplers; frequency spectrum; state estimation; pulse shape; stator winding model; distortion;

    Sammanfattning : .... LÄS MER

  3. 2. Partial Discharges in Large Rotating Machines - Continuous On-line Monitoring and Localisation, Based on a New Developed Technique (InTech)

    Författare :Abkar Kheirmand; Chalmers University of Technology; []
    Nyckelord :InTech; detection; on-line monitoring; insulation; stator; condition control; PD measurement; Powerformer; winding; rotating machine; partial discharge;

    Sammanfattning : Partial discharges (PD) that originate from dielectrically defective parts of the insulation system result in its degradation, which may ultimately lead to a failure of high voltage apparatus. This has resulted in development of numerous PD measuring techniques. One of the most widespread applications of PD measurement is in rotating machines. LÄS MER

  4. 3. Analysis of the Performance of Different V2F Turbulence Models in a Stator Vane Passage Flow

    Författare :Andreas Sveningsson; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; heat transfer; RANS; realizability; V2F; stator flow;

    Sammanfattning : When designing the cooling system of modern gas turbines it is important to be able to predict the heat transfer from the hot gas to the walls surrounding the gas path. One flow feature making this rather complicated is the presence of secondary, three-dimensional flow structures, often referred to as horse shoe vortices, which greatly enhance the rate of heat transfer to the endwall, especially in the leading edge region. LÄS MER

  5. 4. Diagnostics of stator insulatin by dielectric response and variable frequency partial discharge measurements : a study of varied low frequencies in stator insulation, with particular attention to end-winding stress-grading

    Författare :Nathaniel Taylor; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical engineering; Elektroteknik;

    Sammanfattning : Stator insulation is a critical to the reliability of electrical generators and motors. It is common industrial practice to use electrical measurement of partial discharges (PD) and some form of current-voltage measurement as part of the condition assessment of stator insulation at maintenance times. LÄS MER

  7. 5. Permanent magnet motor drives with switched stator windings

    Författare :Eckart Nipp; KTH; []
    Nyckelord :;

    Sammanfattning : Permanent magnet (PM) motors aretoday regarded as aninteresting solution for a wide range ofinverter-fedvariable-speed drives. The generally increasedinterest in these motors hasled to many investigations on theirfeasibility for vehicle propulsion. LÄS MER