Sökning: "Lumped Element Modelling"

Hittade 4 uppsatser innehållade orden Lumped Element Modelling.

  1. 1. High-Frequency Voltage Distribution Modelling of a Slotless PMSM from a Machine Design Perspective

    Master-uppsats, KTH/Elkraftteknik

    Författare :Patrik Brauer; [2018]
    Nyckelord :Windings; drives; transients; surges; steep-fronted; slotless; litz-wire; effective relative permeability; Lindningar; elektriska drivlinor; transienter; spänningspulser; litz-tråd; effektiv relativ permeabilitet;

    Sammanfattning : The introduction of inverters utilizing wide band-gap semiconductors allow for higher switching frequency and improved machine drive energy efficiency. However, inverter switching results in fast voltage surges which cause overvoltage at the stator terminals and uneven voltage distribution in the stator winding. LÄS MER

  2. 2. Network Modelling of Cooling of Hydro-Generators. A Thermal and Fluid Model.

    H-uppsats, Chalmers tekniska högskola/Institutionen för tillämpad mekanik

    Författare :Marc Cabré Gimeno; [2017]
    Nyckelord :Hydropower; Generator; Cooling; Ventilation; Lumped element; Thermal network; Fluid network; Transient simulation; 3D network modelling; parametric study;

    Sammanfattning : Air-cooling is the most common way of cooling large generators like those used inhydropower. However, because these machines are quite complex and therefore, understandingthe cooling of these machines is not easy. LÄS MER

  3. 3. Modelling a piezoelectric-driven actuator for active flow control

    Master-uppsats, Linköpings universitet/Linköpings universitet/ReglerteknikTekniska högskolan

    Författare :Emma Ring; [2014]
    Nyckelord :Piezoelectric actuator; Lumped Element Modelling; Equivalent circuits; Active Flow Control; Simulink;

    Sammanfattning : Flow control is an area of research of particular interest within automotive and aerospace industries since methods used to affect the fluid flow around vehicles can reduce drag and therefore lower their fuel consumption. One of these methods, which has generated a lot of interest in later years, is called active flow control and uses different types of actuators to impact the surrounding flow. LÄS MER

  4. 4. Thermal modelling of the Synchronous Reluctance Machine

    Uppsats för yrkesexamina på avancerad nivå, KTH/Elektrisk energiomvandling

    Författare :Mohamad Mahmoudi; [2012]
    Nyckelord :;

    Sammanfattning : In this paper two methods for thermally modelling the Synchronous Reluctance Machine (SynRM) have been developed and compared to measured data. The first is an analytical method for estimating the end winding temperature based on Brostr¨oms formula. Curve fitting to the measured data was done by Gauss-Newton estimation. LÄS MER