Power Electronics - Grainger Center for Electric Machinery and by ewghwehws

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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.

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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            Purposes of the Grainger Center

 • Organize a national collaborative network
   for machines innovation.
       –   California – Berkeley
       –   Georgia Tech
       –   Ohio State
       –   Purdue
       –   RPI
       –   Wisconsin



Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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            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.org
   for a view of the major topics for the 2003
   Future Energy Challenge.
 • Sponsored by USDOE, USDOD, IEEE, and
   by the Grainger Center.


Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                    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.



Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                               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.

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                               Project Overview

 • New energy sources such as miniature
   fuel cells.
 • Biomechanical research.
 • Ideas with the potential for revolutionary
   advances in machines and
   electromechanical devices.




Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                                Sample Projects

 • Linear motor design for the teaching
   laboratory.




 • This provides a true “open-frame”
   arrangement for detailed classroom
   experiments.
Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                                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.


Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                                Sample Projects

 • Battery equalization for improved battery
   management.
 • Keep battery voltages
   tightly matched during
   charge and discharge
   to maintain performance.
 • A simple switched-capacitor approach
   provides precise matching while avoiding
   tolerance limitations.

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                                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.



Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                                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.
 • Significant
   benefits at
   light load.

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                                Sample Projects

 • High-fidelity pulse width modulation
   (PWM) for audio applications – with spin-
   offs for drives.




Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                                 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.


Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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  Ac Motor Designs for 42 V Auto Systems



                                                                                 Source: Johnson
                                                                                  Electric, 1999.




Car motor usage is growing fast.
It will soon rise to 200 electric motors per car.
The 42 V system redesign is an opportunity.
Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                           Vehicle Applications
 • CEME has experience in electric and hybrid
   cars.




Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                 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.




Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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                                      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.

Grainger Center for Electric Machines and Electromechanics   University of Illinois at Urbana-Champaign
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