Stanley Hong and Chandler Seo with adviser Kevin Kim Previously, we have reported recordhigh peak drain current and maximum transconductance of GaN metal-semiconductor field-effect transistors (MESFETs) using a selective-area-growth (SAG) technique performed by plasma-assisted molecular beam epitaxy (PAMBE). The PAMBE- based SAG enabled selective growth of heavily doped n+-GaN layer (1.0 × 1019 cm-3) only […]
Hybrid Passive Components
Daisy Chen with adviser Patrick L. Chapman This project involves design and construction of miniature filter components that have both capacitive and inductive (i.e., “hybrid”) behavior. These components are implemented on semiconductor substrates with a minimum footprint. The purpose is to miniaturize power-converter components so that power density is increased while efficiency is maintained. The […]
Dynamic Simulation of Dual Mechanical Port Machine
Yuan Zhang with adviser L. Xu, The Ohio State University The dual mechanical port (DMP) machine shown in Figure 10 has more than one mechanical port—the outer phase modulation (PM) rotor and the inner wound rotor. The PM rotor is sandwiched by the stator and inner wound rotor. The black parts of PM rotor represent […]
Evaluation of Torque-Angle-Based Induction Motor Control Scheme
Guoliang Zhang with adviser P. T. Krein In previous work, a torque-angle-based analysis and control method for the induction machine was proposed and simulated. A hardware platform based on inverter technology and fast-prototyping DSP software was set up and tested. The constant-torque-angle (CTA) controller proposed by Guoliang Zhang with his adviser P. T. Krein was […]
Hand-Cranked Electric Generator to Poper Remote Off-Grid Villages
Aristidis Zachas and Long Wu with advisers T. G. Habetler, D. M. Divan, and R.G. Harley, Georgia Institute of Technology The concept of a portable hand generator has been successfully evaluated, and a final design has been developed. From the research conducted, it is noted that the output power available from a person is in […]
A Framework for the Analysis and Design of Vector Controllers for Induction Machines
Zakdy Sorchini with adviser Philip T. Krein The development of controllers for induction machines has been incremental rather than revolutionary. The traditional current-flux model is partially responsible for this, because the control objectives (torque and flux magnitude) are implicit to the model. This project makes contributions to the understanding and performance improvement of induction machine […]
An Extended Field Reconstruction Technique for Optimization of Permanent Magnet Synchronous Machine Drive Systems
Brad Deken with adviser Steve Pekarek, Purdue University Designers of permanent magnet synchronous machine (PMSM) drive systems face the challenge of selecting a machine geometry and stator excitation that must meet a number of competing requirements for torque density, torque ripple, cost, mass, etc. Tools that are used to create PMSM designs are often based […]
Mathematical Field Computation as an Analytical Tool for Electric Machines
Tim O’Connell with adviser PhilipT. Krein The domain of achievable electric machine topologies is growing quickly, given the recent increase in the availability of inverters, exotic permanent magnet materials, and low-cost, precision manufacturing. These new possibilities require the advancement of available design tools. While finite element analysis (FEA) is a powerful analysis tool that is […]
Magnetic Equivalent Circuits Applied to Induction Machine Design
Marco Amrhein with adviser Philip T. Krein The design of induction machines has traditionally been done with analytical models, which usually consist of an electrical equivalent circuit approximation of the machines. These models are enhanced with empirical equations that were based on measurement results in order to include various effects. Machine designers use these models […]