Sökning: "damper bars"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden damper bars.

  1. 1. Field Current Control for the Damping of Rotor Oscillations and for the Alternative Start of Synchronous Machines : Further Innovative Applications of Field Current Active Control besides UMP-Compensation

    Master-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper

    Författare :Roberto Felicetti; [2018]
    Nyckelord :asynchronous start; current control; damping bars; damper winding; d-axis; q-axis; hunting; natural frequency; Park s reference frame; rotor back-EMF; rotor oscillations; synchronous motor;

    Sammanfattning : The possibility to save energy in synchronous machines operation by dismissing d-axis damping bars and surrogating them with active excitation current control in sectored field winding is proved. In particular a way to recover the energy of rotor oscillations during power regulation is shown by means of a studycase generator whereas a self-starting machine is analytically and numerically designed in view of its next construction and test. LÄS MER

  3. 2. Damper Winding Fault Detection in Synchronous Machines

    Uppsats för yrkesexamina på avancerad nivå,

    Författare :Fredrik Holmgren; [2016]
    Nyckelord :Fault detection; condition monitoring; motor diagnostics; synchronous machines; synchronous motors; electrical machines; motor drives; damper winding; damper bars;

    Sammanfattning : This thesis aims to identify methods for detection of damper winding faults in synchronous machines (SMs) powered by variable frequency drives (VFDs). The problem of failing damper windings has received attention after reports of serious damage which have been discovered during maintenance checks. LÄS MER

  4. 3. Vertikaltransportör : Till pappersrullar

    M1-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013); Karlstads universitet/Avdelningen för maskin- och materialteknik

    Författare :Luiz Benicio Ferreira Neto; [2013]
    Nyckelord :vertikaltransportör hiss till pappersrullar examensarbete exjobb kau karlstads universitet luiz ferreira camatec 2013 maskinteknik fem analys beräkningar;

    Sammanfattning : This project includes a thesis performed at Karlstad University in spring 2013. The thesis is included in the mechanical engineering program and contains 22.5 university points, which is equivalent to 480 hours of work including self-study. LÄS MER

  5. 4. Reglering av turbins ledskenor i vattenkraftverkmed hjälp av elektriska ställdon

    M1-uppsats, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE)

    Författare :Samir Hadzic; Jakub Luszczynski; [2012]
    Nyckelord :Vattenkraftverk; Ledskenor;

    Sammanfattning : Hydropower is the largest renewable energy source available in today's society. Operation and production is handled by high-tech electronics. LÄS MER

  7. 5. Dämplindningens inverkan på spänningens kurvform i en vattenkraftsgenerator

    Uppsats för yrkesexamina på avancerad nivå, Elektricitetslära

    Författare :Marielle Perup; [2010]
    Nyckelord :generator; övertoner; tomgångsspänning; dämplindning; dämpkrets; dämpstavar;

    Sammanfattning : Harmonics are a well-known problem that has to be dealt with in the design of thegenerator. Internationally accepted standards limits the amount of harmonics allowedin the no-load voltage. These limits can be difficult to fulfill with integral slot winding,where the number of slots per pole and phase is an integer. LÄS MER