Sökning: "ripple"

Visar resultat 1 - 5 av 46 avhandlingar innehållade ordet ripple.

  1. 1. Modeling and Analysis of the Interaction of Batteries and Power Electronic Converters

    Författare :Rúdi Soares; Oskar Wallmark; Remus Teodorescu; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Alternating current; aging; electric vehicles; harmonics; lithium-ion batteries; power converter; resonant filters; ripple; temperature control.; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : This thesis deals with the interaction of batteries and power electronic converters in automotive applications. Even if the additional heating caused by (unwanted) alternating currents is disregarded, there has been a concern that alternating currents can be harmful for batteries. LÄS MER

  3. 2. Thermal and State-of-Charge Balancing of Batteries using Multilevel Converters

    Författare :Faisal Altaf; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thermal balancing; Convex optimization; DC-link ripple; Battery ripple; Battery control; Hybrid electric vehicles.; Multilevel converter; Cell balancing;

    Sammanfattning : Driven by the needs to reduce the dependence of fossil fuels and the emissions of conventional vehicles there has in recent years been an increasing interest in battery-powered electrified vehicles (xEVs). In xEVs, the battery pack, built from many small cells, is one of the most expensive components in the powertrain. LÄS MER

  4. 3. On Fluid Power Piston Pumps : With Special Reference to Flow Ripple Reduction

    Författare :Maria Pettersson; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : Among the major disadvantages of fluid power systems, leakage and an unpleasant sound level can be mentioned. Both drawbacks increase with increasing pressure ripple. Functional problems may be caused, even fatigue and breakdown. A main source of noise is hydrostatic pumps. LÄS MER

  5. 4. Rural migration in Sweden : a new green wave or a blue ripple?

    Författare :Susanne Hjort; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; rural; migration; gentrification; middle class; Sweden; reflexivity; quantitative methods; Human geography; economic geography; Kulturgeografi; ekonomisk geografi; Social and Economic Geography; kulturgeografi;

    Sammanfattning : .... LÄS MER

  7. 5. Synchronous Reluctance Machine (SynRM) in Variable Speed Drives (VSD) Applications

    Författare :Reza Rajabi Moghaddam; Chandur Sadarangani; Alfredo Vagati; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Synchronous Reluctance Machine SynRM ; Torque; Torque Ripple; Design; Optimization; FEM; Control; Standard Size; Measurement; Performance Comparison; Induction Machine IM ; Interior Permanent Magnet Machine IPM ; Variable Speed Drive VSD ; General Purpose GP ; Field Oriented Control FOC ; Direct Torque Control DTC ; Heat Run; Test; Thermal; Operation Diagram; Circle Diagram; Electrical engineering; Elektroteknik;

    Sammanfattning : This thesis is comprehensively dedicated to the theoretical and experimental reevaluation of the Synchronous Reluctance Machine (SynRM). A simple approach to derive the SynRM main characteristics and behavior is followed. An introduction to an evaluation of the different control strategies in is given. LÄS MER