Essays about: "ripple currents"

Showing result 1 - 5 of 9 essays containing the words ripple currents.

  1. 1. Influence of current harmonics on the degradation of the catalyst coated membrane in PEMFC

    University essay from KTH/Kemiteknik

    Author : Evelina Ahlén Norberg; [2022]
    Keywords : Proton Exchange Membrane Fuel Cell; Ripple Current; Current Harmonics; Degradation; Marine transportation; Polymerelektrolytbränslecell; Rippelström; Strömoscillation; Åldring; Sjötransport;

    Abstract : Sjöfarten är idag dominerad av förbränningsmotorer som är beroende av fossila drivmedel. Elektrifiering är en av huvudstrategierna för att möjliggöra fossilfri energiförsörjning inom internationell sjöfart. READ MORE

  3. 2. CURRENT OVERSAMPLING ANALYSIS FOR ADVANCED CONTROL OF ELECTRIC AC DRIVES

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Marco Giuliato; [2019]
    Keywords : ;

    Abstract : The main purpose of this thesis is to develop a sensorless control for a synchronous reluctance motor by using the slope measurement of the current ripple introduced by the Space Vector Modulation.The position estimation is performed at each Space Vector Pulse Width Modulation period and it relies on the estimation of current derivatives. READ MORE

  4. 3. Investigation of sinusoidal ripple current charging techniques for Li-ion cells

    University essay from KTH/Skolan för elektro- och systemteknik (EES)

    Author : Sunilkumar Vadivelu; [2016]
    Keywords : Constant-current constant-voltage charging; electrochemical impedance spectroscopy; Li-ion cells; minimum-ac-impedance frequency; ripple currents; sinusoidal ripple-current charging; CC-CV-laddning; elektrokemisk impedansspektroskopi; Li-jonceller; SRC-CV-laddning;

    Abstract : In recent years, the demand for Li-ion-type batteries has been increasing significantly in various fields of applications including portable electronics, electric vehicles, and also in renewable energy support. These applications ask for a highly efficient charging strategy in order to maintain a long life cycle of the batteries. READ MORE

  5. 4. Power Electronic Stages for a TFPMSM in Wave Power Applications

    University essay from KTH/Skolan för elektro- och systemteknik (EES)

    Author : Gustaf Falk Olson; [2016]
    Keywords : transverse flux permanent magnet synchronous machine TFPMSM ; active rectifier; direct drive wave energy converter; feedback linearization; cascaded PID controller.;

    Abstract : Direct drive wave energy conversion systems have been identified as a potentially major contributor to the world’s energy demands, forecasting shares of up to 25 % of the energy mix. Anders Hagnestål conducts research at the Royal Institute of Technology where a novel linear transverse flux permanent magnet generator is developed. READ MORE

  6. 5. Evaluation of Hall-sensors for motor control in high precision applications for aircraft

    University essay from Uppsala universitet/Elektricitetslära

    Author : Oscar Forsberg; [2016]
    Keywords : Hall-effect sensor; motor control; electrical motor; PMSM;

    Abstract : A functioning prototype test motor with Hall-sensor feedback has been built, and the test results show that the motor performance in terms of speed ripple is well within the specified demands. The temperature demands however, have not been fully met. READ MORE