Magnetics Business & Technology - May/June 2020 - 22

RESEARCH & DEVELOPMENT

Parallel Inner-Magnet Device Can Create More Power in Electrical Generators

Purdue University researchers have come up with a way to reduce the size and increase the efficiency of some electric generators, which are
used in automobiles, aircraft and microgrids.
Electric generators have a plethora of uses - ranging from automotive to aircraft to microgrids. There is currently a strong desire
to reduce the size and increase the efficiency of the devices.
Researchers at Purdue University have come up with an effective way to reduce the size and increase the efficiency of the
moderate- to low-power electric generators used in those applications.
A wound rotor synchronous machine contains a field winding - a
group of insulated current-carrying coils - on the rotor used to
create a rotating magnetic field and regulate the output voltage.
Associated with this winding are losses, which generate heat that
must be removed from the spinning rotor. Permanent magnets
can also be used to generate the magnetic field with much less
loss and heat generation, but this approach does not facilitate

output voltage regulation.
"The Purdue parallel inner-magnet device is a hybrid solution
that creates some of the field with a permanent magnet and
some of the field with a field winding," said Scott Sudhoff, the Michael and Katherine Birck Professor of Electrical and Computer
Engineering in Purdue's College of Engineering, whose research
focuses on power electronics and electromechanical devices.
"This allows for regulation, but with lower losses than a conventional machine."
Omar Laldin, a former Ph.D. student of Sudhoff, helped lead
the Purdue team that created the inner-magnet device. Sudhoff
said the device could be used in a variety of AC and DC (with a
rectifier) generator applications. Key issues include the questions of the best machine structure in terms of merging the two
field sources, electromagnetic damping and fault performance.
The team has validated the design code through finite element
analysis based testing.
The team has worked with the Purdue Research Foundation
Office of Technology Commercialization to patent the technology
and is looking for commercialization partners. Sudhoff also has
worked with the same office on other technologies.

Purdue University researchers developed a parallel inner-magnet
device to reduce the size and increase the efficiency of the moderateto low-power electric generators.

22

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May/June 2020

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Magnetics Business & Technology - May/June 2020

Table of Contents for the Digital Edition of Magnetics Business & Technology - May/June 2020

Magnetics Business & Technology - May/June 2020
Contents
Editor’s Choice/ Features
Magnetics Technology Flying High, Hot & Cold in Solar Orbiter Mission to the Sun
Carpenter Technology Moves Forward in Soft Magnetics and Additive Manufacturing, Exclusive Interview with CEO Tony Thene
Technique Uses Magnets and Light to Control, Reconfigure Soft Robots
Research & Development
Product News
Industry News
Annual Industry Resource Guide
Events Calendar/ Advertising Index
Magnetic Field at Martian Surface Ten Times Stronger than Expected
Visions
Magnetics Business & Technology - May/June 2020 - Magnetics Business & Technology - May/June 2020
Magnetics Business & Technology - May/June 2020 - Cover2
Magnetics Business & Technology - May/June 2020 - Contents
Magnetics Business & Technology - May/June 2020 - Editor’s Choice/ Features
Magnetics Business & Technology - May/June 2020 - 5
Magnetics Business & Technology - May/June 2020 - Magnetics Technology Flying High, Hot & Cold in Solar Orbiter Mission to the Sun
Magnetics Business & Technology - May/June 2020 - 7
Magnetics Business & Technology - May/June 2020 - 8
Magnetics Business & Technology - May/June 2020 - 9
Magnetics Business & Technology - May/June 2020 - Carpenter Technology Moves Forward in Soft Magnetics and Additive Manufacturing, Exclusive Interview with CEO Tony Thene
Magnetics Business & Technology - May/June 2020 - 11
Magnetics Business & Technology - May/June 2020 - 12
Magnetics Business & Technology - May/June 2020 - 13
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Magnetics Business & Technology - May/June 2020 - Research & Development
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Magnetics Business & Technology - May/June 2020 - Product News
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Magnetics Business & Technology - May/June 2020 - Industry News
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Magnetics Business & Technology - May/June 2020 - Annual Industry Resource Guide
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Magnetics Business & Technology - May/June 2020 - Events Calendar/ Advertising Index
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