IEEE Electrification - March 2022 - 3

French mathematician, Denis Auroux.
My first impression of the MIT open
course was: " God bless MIT and the
Internet. " The course is just too good.
Students learn how to think rigorously
and use numbers and examples for
understanding and moving forward.
There are so many great courses
online, e.g., linear algebra from Gilbert
Strang and physics courses from Walter
Lewin, just to name a few.
Following the example of MIT,
Prof. Saifur Rahman launched PES
University to provide lifelong learning
education opportunities to PES
members. Each month there are
webinars from PES University. Similarly,
the IEEE Power Electronics Society
and Industry Applications Society
both offer webinars. I hope authors
consider contributing webinars to
help disseminate their articles.
Letters to the Editor
Quite often, I receive messages from
colleagues telling me that they enjoy
reading IEEE Electrification Magazine.
If you also enjoy reading it, and you'd
like to provide feedback, please send
me an email (fll@ieee.org). Selected
letters will be published.
New Columns
The magazine plans to launch two new
columns: " History " and " What's Popular. "
I offer my own experiences as
examples of learning from the classic
and current articles.
Classic Articles (History)
While doing a computer simulation to
start a synchronous generator, a student
in my group found that the
machine can only reach half of its
nominal speed. Increasing the rotor
resistance solves the issue. Later, while
reading Chapter 9 ( " Unbalanced Operation
and Single-Phase Induction
Machines " ) of the third edition of
Krause's book Analysis of Electric
Machinery and Drive Systems, we
learned of the Goerges phenomenon,
discovered in the 1890s. The book then
pointed to a 1950 paper for detailed
explanation. This led to our reading of
the classic article published in 1950
by Garbarino and Gross, titled " The
Goerges Phenomenon-Induction
Motors with Unbalanced Rotor Impedances. "
In merely seven pages, after a
concise explanation, it presents the
circuit representation of an induction
machine under rotor impedance
imbalance. Indeed, it took quite some
effort for us to apply all relevant theories
(symmetric component and space
vector) to derive the circuit. We then
conducted a computer simulation in
the MATLAB/Simscape environment.
The analysis results can all be matched
by simulation results.
After sharing our article (as a tribute
to Garbarino and Gross) with colleagues
in both industry (Bob Nelson of
Siemens) and academia (Gerald Heydt
of Arizona State University and Peter
Sauer of University of Illinois at Urbana-Champaign),
we further learned
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IEEE Electrification - March 2022

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