Essays about: "electric current"

Showing result 1 - 5 of 221 essays containing the words electric current.

  1. 1. Bearing current and shaft voltage measurement in electrical motors

    University essay from Högskolan Väst/Avdelningen för data-, elektro- och lantmäteriteknik

    Author : Edo Kolic; [2017]
    Keywords : Modulated drive; electrical motors; production;

    Abstract : Due to the fast-rising voltage pulses of pulse width modulated drives, the generated shaft voltage of electrical motors causes electrical discharge currents in bearings. These discharges can cause bearing failure leading to costly maintenance and unexpected production stops. READ MORE

  2. 2. Electric Field Domains in Quantum Cascade Lasers

    University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/Matematisk fysik (N)

    Author : Tim Almqvist; [2017]
    Keywords : quantum cascade laser; QCL; electric field domain; EFD; NDR; negative differential resistivity; simulations; Tim; Almqvist; kvantkaskadlaser; Physics and Astronomy;

    Abstract : Quantum cascade lasers (QCLs) are periodic semiconductor heterostructures, capable of producing laser gain. They have become an important source of coherent radiation in the mid infrared, and THz frequency regions. QCLs are non-linear electric devices, and often have bias regions of negative differential resistivity (NDR). READ MORE

  3. 3. Load-current response to severe changes of voltage

    University essay from KTH/Elektroteknisk teori och konstruktion

    Author : Shuhan Ma; [2017]
    Keywords : ;

    Abstract : Electric loads, such as computers, lamps, refrigerators and heaters connected to low-voltage distributionsystems in homes and offices differ widely in how their current responds to changes in the applied voltage.These voltage changes could be a total collapse of the voltage, a weak or strong reduction of amplitude,or a sudden phase-shift. READ MORE

  4. 4. Simulation and Optimization of a Hybrid Renewable Energy System for application on a Cuban farm

    University essay from Uppsala universitet/Fasta tillståndets fysik

    Author : Malin Frisk; [2017]
    Keywords : renewable energy; hybrid energy system; Cuba;

    Abstract : This paper presents an analysis of the feasibility of utilizing a hybrid renewable energy system to supply the energy demand of a milk and meat farm in Cuba. The study performs simulation and optimization to obtain a system design of a hybrid renewable energy system for application on the farm Desembarco del Granma in the Villa Clara province in the central part of Cuba, for three different cases of biomass availability. READ MORE

  5. 5. Electricity retailer –from liability to asset

    University essay from KTH/Hållbarhet och industriell dynamik; KTH/Hållbarhet och industriell dynamik

    Keywords : Electricity retailer; profitability; positioning; competitive strategy; servitization; homogenous product;

    Abstract : Electricity retailers have difficulties to differentiate themselves from each other, dueto increased competition and political regulations. The electric energy tradingmarket is facing a paradigm shift. READ MORE