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The Grainger Center for Electric Machinery and Electromechanics – Update, May 2002. May 2002. P. T. Krein, Director Grainger Center for Electric Machinery and Electromechanics Dept. of Electrical and Computer Engineering. Purposes of the Grainger Center.
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The Grainger Center for Electric Machinery and Electromechanics – Update, May 2002 May 2002 P. T. Krein, Director Grainger Center for Electric Machinery and Electromechanics Dept. of Electrical and Computer Engineering
Purposes of the Grainger Center • Establish leadership in electric machines and electromechanics. • Nurture a new generation of engineers for the electric machinery field. • Advance the technologies of machines and electromechanics. • Support student team programs in the field, such as the Future Energy Challenge.
Purposes of the Grainger Center • Organize a national collaborative network for machines innovation. • California – Berkeley • Georgia Tech • Ohio State • Purdue • RPI • Wisconsin
Purposes of the Grainger Center • Stimulate activity in the processing and use of electrical energy as it relates to expanding the scope and applications of machines and electromechanics. • Please see http://www.energychallenge.orgfor a view of the major topics for the 2003 Future Energy Challenge. • Sponsored by USDOE, USDOD, IEEE, and by the Grainger Center.
About the Grainger Center • Started in 1999 with a $1.4 million grant from the Grainger Foundation. • This included extensive equipment support as well as operations. • Grant support will be renewed in 2002. • A new faculty member (Pat Chapman) was added and supported through the CEME.
Project Overview • Fundamentals of machine design. • Best use of materials. • Point-by-point selection. • Field analysis for “optimization.” • MEMS work from the application and electromechanics viewpoints. • Motor control (from a systems perspective). • Power electronic devices to expand the application of drives.
Project Overview • New energy sources such as miniature fuel cells. • Biomechanical research. • Ideas with the potential for revolutionary advances in machines and electromechanical devices.
Sample Projects • Linear motor design for the teaching laboratory. • This provides a true “open-frame” arrangement for detailed classroom experiments.
Sample Projects • Induction machine optimization for “dedicated inverter” operation. • Select among copper, aluminum, and steel at each point in the rotor, to maximize torque while minimizing losses. • Take advantage of an electronic drive to deliver the necessary frequency to provide high torque and low loss.
Sample Projects • Battery equalization for improved battery management. • Keep battery voltagestightly matched duringcharge and dischargeto maintain performance. • A simple switched-capacitor approach provides precise matching while avoiding tolerance limitations.
Sample Projects • Gallium-nitride device development for power electronics. • GaN is an important alternative to SiC. • Has the advantages of a high-bandgap material, plus it is in production for LEDs. • A very promising material for power semiconductors.
Sample Projects • Efficiency-optimizing control for motor drives. • This is based on the ripple-correlation concept invented at Illinois. Motor flux is adjusted in real time to minimize power consumption. • Significantbenefits at light load.
Sample Projects • High-fidelity pulse width modulation (PWM) for audio applications – with spin-offs for drives.
Future Projects • Fast 3D magnetics for machine design and analysis. • Power processing for miniature fuel cells, and a possible “fuel cell center.” • Nonlinear controls for complicated motor-load combined systems. • Noise mitigation in machine applications. • Active filters to minimize drive EMI.
Ac Motor Designs for 42 V Auto Systems Car motor usage is growing fast. It will soon rise to 200 electric motors per car. The 42 V system redesign is an opportunity. Source: Johnson Electric, 1999.
Vehicle Applications • CEME has experience in electric and hybrid cars.
Miniature Power Applications • A sample design challenge: • Efficient miniature power for communications, network nodes, and MEMS devices. • Supply just a few milliwatts, with very high efficiency. • Example: power on a chip.
Conclusion • The Grainger CEME is being built up as the national leader in electric machines and electromechanics. • We intend to nurture a new generation of machine designers with broad systems expertise and a background in fundamental electromechanics. • We seek to pursue revolutionary concepts in the design, control, and use of all types of electromechanical devices.