Sökning: "direct current dc"

Visar resultat 1 - 5 av 62 uppsatser innehållade orden direct current dc.

1. 1. Analys och minskning av effektförlusterna i en borstlös likströmsmotor med vektorstyrning

   Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Industriell elektroteknik och automation

   Författare :Lider Xavier Garcia Parrales; [2023]
   Nyckelord :Effektförluster Borstlös likströmsmotor BLDC Vectorstyrning Field-oriented Control FOC Blockkommutering Block commutation MTPA; Technology and Engineering;

   Sammanfattning : This report addresses power losses in an electric motor arising from various sources. The choice of motor control strategy can decrease efficiency if not implemented correctly or if the motor model in the control loop is overly simplified. LÄS MER

3. 2. Thermal Modeling and Simulationwith High Voltage Solid StateRelays for Battery DisconnectionApplications : The potential of replacing mechanical contactors with semiconductors

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

   Författare :David Radisic; Johan Mårtensson; [2023]
   Nyckelord :SSR; SSCB; SiC MOSFET; BEV; Pre-charge; Solid-state relay; Solid-state circuit breaker; Electric vehicles; DC fast-charge; Simulink; BDU;

   Sammanfattning : The swift shift of the automotive industry towards electrification is primarily propelled by technological advancements in battery technology. To stay competitive and meet the new demands of the industry, there is a crucial need for novel ideas and innovation. LÄS MER

4. 3. Evaluation of MPC and PI control on a Tribometer : Design and comparison of control methods for a Pin-on-Disc Tribometer

   Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

   Författare :Ehab Ziad Raheem; Tore Malmström; [2023]
   Nyckelord :Control Theory; MPC; PI; PI-Cascade; Tribometer; Pin-on-Disc; Reglersystem; MPC; PI; PI-Kaskadreglering; Tribometer; Stift-På-Skiva;

   Sammanfattning : This thesis compares Model Predictive Control (MPC) and Proportional-Integral (PI) control in a pin-on-disc tribometer. The tribometer consists of a geared Direct Current (DC) motor driving a flywheel and a voice coil actuating a pin onto the surface of the flywheel. LÄS MER

5. 4. Effects of Forest Ditch Cleaning on Surface Water Quality

   Master-uppsats, SLU/Dept. of Aquatic Sciences and Assessment

   Författare :Emeli Arvidsson; [2023]
   Nyckelord :Ditch cleaning; forest clear-cut; water quality; water chemistry;

   Sammanfattning : Ditch cleaning (DC) is recommended by authorities to Swedish landowners to maintain forest productivity after forest harvest by lowering groundwater tables of catchment soils. Knowledge regarding the impact of this practice on surface water quality is limited, and results from previous research vary. LÄS MER

7. 5. 2 + 1 Dimensional Chern-Simons Theory for Landau-Ginzburg Theory

   Kandidat-uppsats,

   Författare :Adam Fredriksson; [2023]
   Nyckelord :2 1 dimensional Chern-Simons theory; superconductivity.;

   Sammanfattning : In this work, 2 + 1 dimensional Chern-Simons theory have been used in an attempt to describe superconductivity. It was examined if the two defining properties of superconductivity, infinite direct current (DC) conductivity and the Meissner effect, as well as the two characteristic length scales of superconductors, the London penetration depth and the coherence length, could be obtained. LÄS MER