Browsing by Author "Fischer, Manuel"

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    Analysis of the influence of static and dynamic eccentricity on back EMF of a permanent magnet synchronous motor
    (2017) Fischer, Manuel; Roth-Stielow, Jörg
    In this paper the measurement results that represent the back electromotive force (EMF) of a small drive permanent magnet synchronous machine (PMSM) are proposed. The focus is on the comparison between three mechanical configurations: the original one and a setup with static and dynamic eccentricity. Additionally, the influence of compensating currents is considered due to the circuitry of the windings belonging to one phase. This leads to quite similar gradients of back EMF in all three mechanical configurations.
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    Comprehensive comparison of a SiC MOSFET and Si IGBT based inverter
    (2019) Nitzsche, Maximilian; Cheshire, Christoph; Fischer, Manuel; Ruthardt, Johannes; Roth-Stielow, Jörg
    The investment which is necessary to replace Si IGBTs with SiC MOSFETs in medium to high power DC-AC inverters needs to be balanced carefully against the advantages SiC offers. This paper compares a 20 kW Si IGBT inverter with a 20 kW SiC MOSFET inverter. The power semiconductor components are operated identically in a modular half bridge module to ensure comparability. Thereby the measurement of the switching losses is explicitly not the focus but the overall efficiency while taking volume, current ripple, switching frequency and inductance into account. The limits of reasonable operating range shall be evaluated and an overview on the benefits of SiC on system level will be given.