IEEE Power & Energy Magazine - May/June 2019 - 12

figure 3. The three-phase squirrelcage induction motor of Dolivo-Dobrowolsky, 1889 [5]. (Photo courtesy
of Deutsches Technikmuseum, Berlin,
AEG Archives.)

Exhibition in Frankfurt, Germany, Carl
Hering, vice president of the American
Institute of Electrical Engineers, noted
that, in the case of the drehstrom, or threephase ac system, "Each lead will act as
the return lead for the other two in multiple, and therefore only three leads are
required, although there are three distinct
currents." (See [2] and [3].)
Wherever possible, the need for
only three terminals was highlighted

figure 4. A demonstration table of Allgemeine Elektricitäts-Gesellschaft (AEG),
Berlin, 1890, consisting of three-phase ac connecting wires (foreground) and
(from left to right) a phase-reverse switch, a 2-hp three-phase induction motor,
and direct coupling with a dc generator for charge. (Photo courtesy of Deutsches
Technikmuseum, Berlin, AEG Archives.)

with pride by the proponents of the new
class of polyphase system. Michael
Dolivo-Dobrowolsky, the chief elec-

trician of the Allgemeine ElektricitätsGesellschaft in Berlin and the creator
of the first three-phase squirrel-cage



http://www.powerworld.com

IEEE Power & Energy Magazine - May/June 2019

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2019

Contents
IEEE Power & Energy Magazine - May/June 2019 - Cover1
IEEE Power & Energy Magazine - May/June 2019 - Cover2
IEEE Power & Energy Magazine - May/June 2019 - Contents
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IEEE Power & Energy Magazine - May/June 2019 - Cover3
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