Essays about: "damper bars"

Found 3 essays containing the words 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

    University essay from Uppsala universitet/Institutionen för teknikvetenskaper

    Author : Roberto Felicetti; [2018]
    Keywords : 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;

    Abstract : 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. READ MORE

  3. 2. Damper Winding Fault Detection in Synchronous Machines

    University essay from

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

    Abstract : 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. READ MORE

  4. 3. Optimization and estimation routine for tuned mass damper

    University essay from Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Author : Chen Xiao Le; [2010]
    Keywords : Boring bar; Damper; Optimization routine; FRF; Dynamic property ;

    Abstract : An economic way to attenuate vibrations of a boring bar is by inserting a tuned mass damper into the free end and maximize its effect by pre-tuning. When tuning the damper, it is important to aquire the damper’s dynamics by frequency response function measurement. READ MORE