M.S. student Ross Liederbach with advisors P. T. Krein, K. Kim, and E. Rosenbaum Wide-bandgap device materials offer promising characteristics for power conversion at high temperatures. Several applications already benefit from high temperature (~200 °C) power conversion electronics, but pushing to more extreme temperatures, 250 ° up to 400° C, could prove even more advantageous. […]
Resonant Split-Phase Switched Capacitor Converter with High Step-Up Voltage Ratio
MS student Benjamin Macy with advisor R. Pilawa-Podgurski There has been a renewed interest in switched-capacitor converters (SCC) because they can achieve high-voltage conversion ratios, small size, and IC integration. SCCs can have high power densities through the elimination or reduction of magnetic components and the relatively high energy density of capacitors compared to inductors. […]
Converter Rating Analysis for Photovoltaic Differential Power Processing Systems
PhD student Christopher Barth with advisor R. Pilawa-Podgurski Recent advances in semiconductor and microcontroller technology are opening new opportunities in power electronics design. Traditionally, inverters have employed a minimal number of active switching components and used large passive inductors to filter two or three voltage levels into sinusoidal currents. This results in a relatively simple […]
AC Losses in a 1 MW PM Electric Machine Using High-Frequency Air-Core Armature Windings
MS student Jonathan Martin with advisor K. Haran The highest power density megawatt-class electrical machines have been developed on the order of 9.16 kW/kg using cryogenic high-temperature superconductor windings. To translate the same class of electric machines to aerospace applications using non-cryogenic technology, the electrical loading per unit weight must be maximized. Additionally, these applications […]
Actively Shielded Air-Core Superconducting Machines
MS student David Loder with advisor K. Haran An important challenge in the design of air-core superconducting machines is containing the magnetic fields within the electric machine. Current solutions result in large reductions of the high power density achievable through the use of superconducting windings. We address this challenge with an actively shielded electromagnet design, […]
Induction Motor Drive Design Based on Drive-Cycle Energy Minimization
MS student Xuan Yi with advisor K. Haran The goal of this high-speed electrical machine project funded by NASA and the Grainger Center for Electric Machinery and Electromechanics is to build a permanent magnet machine with 13 KW/kg (8hp/lb) power density and over 96% efficiency under rated conditions. The targeted power density (twice or three […]
Mechanical Design of High-Speed, High-Frequency Air-Core Machine
MS student Yuanshan Chen with advisor K. Haran A high power density electric machine (8 hp/lb) and integrated high-frequency drives were proposed by Professor Kiruba Haran in the NASA Fixed Wing Project. It is an unconventional inside-out permanent magnet motor with an advanced composite rotor structure. The motor’s cantilever design requires consideration for its mechanical […]
Fully Integrated AC-AC Modular Machine Drive Based on GaN Devices
CEME Collaborator Yehui Han – University of Wisconsin-Madison An integrated modular motor drive (IMMD), as shown in Figure 8, has advantages of small size and high power density. Without extra transmission cables, installation cost of an IMMD is lower, fault-tolerance is improved, and the radiated electromagnetic interference (EMI) is reduced. Target applications include electric vehicles, […]
Hybrid Machines for DC Generation Systems
MS student Andy Yoon with advisor K. Haran Induction motors (IM) and permanent magnet synchronous motors (PMSM) are major types of electric machines prominent across many industries. PMSM, proven to require low maintenance with a long lifespan, is much utilized by the electric vehicle industry. IM has not only proven to be reliable, but also […]
Electromagnetic and Mechanical Performance Analysis of Additive Manufactured Electric Machines Using Finite Element Simulations
CEME Collaborator Julia Zhang – Oregon State University Additive manufacturing is opening new ground for innovations in low-volume production due to faster and cheaper prototyping, reduced lead times, and shorter supply chains. This research focuses on numerical simulations to analyze mechanical and electromagnetic properties of an electric machine made with an additive manufacturing process. ABAQUS […]