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Novel Three-Phase Electronic Transformer
(2024)IEEE Transactions on Power ElectronicsElectronic transformers enable galvanic isolation and voltage level adaption at high frequency, and thus the magnetic core volume and weight can be reduced substantially compared to traditional transformers operating at the grid frequency. This article introduces a novel phase-modular single-stage three-phase electronic transformer (3Φ-ET) which advantageously enables the use of standard power transistors with unipolar voltage blocking ...Journal Article -
Linear-Rotary Position Control System With Enhanced Disturbance Rejection for a Novel Total Artificial Heart
(2024)IEEE Open Journal of the Industrial Electronics SocietyA novel implantable total artificial heart, hereinafter referred to as the ShuttlePump, is currently under development in a research collaboration between the Medical University of Vienna, the Power Electronic Systems Laboratory of ETH Zurich and Charite Berlin. Its novel, low-complexity, pulsatile pumping principle requires a specially shaped piston performing a controlled, synchronized linear-rotary motion while providing the necessary ...Journal Article -
Automatic Time-Division Multiplexing for Inductive Power Transfer to Multiple Stainless-Steel-Enclosed Receivers
(2024)IEEE Journal of Emerging and Selected Topics in Power ElectronicsLinear actuators employed in the food-processing or pharmaceutical industry must be enclosed in stainless steel (SS) for hygienic reasons. Therefore, cables and cable carriers should be avoided and wireless, i.e., inductive power transfer (IPT) should be employed. To achieve high efficiencies, the magnetic field components of the IPT system should be oriented parallel to the SS enclosures, which can be achieved with a coaxial arrangement ...Journal Article -
Novel Acoustic Failure Prediction Method for Active Magnetic Bearing Systems
(2024)IEEE/ASME Transactions on MechatronicsFor magnetic bearing manufacturers, the installation situations in systems in the field are often unknown and not accessible. Hence, the final system vibration spectrum with respect to excitations by operating the system and therefore mechanical resonances are unknown as well. But to avoid failure, they need to be known before the speed is initially ramped-up in a magnetic bearing suspended system. Therefore, there is a need for an ...Journal Article -
Supercritical Operation of Bearingless Cross-Flow Fan
(2024)MachinesThis paper presents a decoupled bearingless cross-flow fan (CFF) that operates at a supercritical speed, thereby increasing the maximum achievable rotational speed and fluid dynamic power. In magnetically levitated CFF rotors, the rotational speed and fan performance are limited by the bending resonance frequency. This is primarily defined by the low mechanical bending stiffness of the CFF blades, which are optimised for fluid dynamic ...Journal Article -
Comparative Analysis of Force and Eddy Current Position Sensing Approaches for a Magnetic Levitation Platform with an Exceptional Hovering Distance
(2024)ActuatorsThis paper provides a comparative analysis between a force sensor and an eddy current sensor, focusing on their usability to determine the position of a circular levitating permanent magnet (PM) mover within an axially symmetric magnetic levitation platform (MLP) with an exceptionally large air gap. The sensors enable closed-loop control, which is essential for accurately and stably maintaining the mover’s radial position. For the considered ...Journal Article -
Comparative Evaluation of Three-Phase Three-Level Flying Capacitor and Stacked Polyphase Bridge GaN Inverter Systems for Integrated Motor Drives
(2024)ElectronicsThis article presents a comprehensive comparative evaluation of a three-phase Three-Level (3L) Flying Capacitor Converter (FCC) and a Stacked Polyphase Bridge Inverter (SPBI), specifically a converter system formed by two Series-Stacked Two-Level three-phase Converters (2L-SSC), for the realization of a 7.5 kW Integrated Motor Drive (IMD) with a high short-term overload capability. The 2L-SSC requires a motor with two three-phase windings ...Journal Article -
Reaction Force-Based Position Sensing for Magnetic Levitation Platform with Exceptionally Large Hovering Distance
(2024)ActuatorsThis work introduces a novel sensing concept based on reaction forces for determining the position of the levitating magnet (mover) for magnetic levitation platforms (MLPs). Besides being effective in conventional magnetic bearings, the applied approach enables operation in systems where the mover is completely isolated from the actuating electromagnets (EMs) of the stator (e.g., located inside a sealed process chamber) while levitating ...Journal Article -
Energy Efficiency is Not Enough!
(2024)IEEE Power Electronics MagazineIn its latest report, the Intergovernmental Panel on Climate Change (IPCC) concludes that any further increase of global temperatures aggravates climate-related risks like species losses, extreme heat and humidity with significant consequences for human health, or negative impacts on food production and water availability; the projected negative outcomes escalate with higher temperature increases [1]. Therefore, worldwide efforts and ...Journal Article -
Nonisolated Three-Phase Current DC-Link Buck-Boost EV Charger With Virtual Output Midpoint Grounding and Ground Current Control
(2024)IEEE Transactions on Transportation ElectrificationNonisolated three-phase AC/DC converter concepts facilitate more compact and more efficient realizations of future electric vehicle (EV) chargers. However, without the galvanic isolation and/or high common-mode (CM) impedance provided by an isolation transformer, nonisolated chargers must employ other means to suppress CM leakage currents to ground sufficiently and to prevent nuisance tripping of mandatory residual current devices (RCDs). ...Journal Article