IEEE Power & Energy Magazine - July/August 2019 - 97

Flexible. Accurate. Smart.

figure 8. Controller steps for series-parallel motor
control. (Source: L.W. Gant, Elements of Electric Traction
for Motormen and Others, New York: Van Nostrand,
1907, p. 155.)

starting resistance (R4-R7) reconnected. In Figure
8(d), all of the starting resistance is again removed, but
now the motors each have full voltage applied to their
armature-field connection, and they are operating at
full speed. The actual speed that the motors attain will
depend on the operating characteristics: line voltage at
that point and load torque requirements. The motors
are connected for movement in the reverse direction in
Figure 8(e). Dynamic braking is shown in the connection in Figure 8(f), where the motors are disconnected
from the line and allowed to send current through the
stating resistor and ground. This is different than what
Sprague called series-parallel control. He reconnected the motor fields in series and parallel in various combinations to achieve a constant-speed motor.
Figure 8 is an oversimplification of the connections. The major part missing is how a closed-circuit
transition is made between two motors running in
series and the same two motors suddenly running in
parallel. For that detail, the reader is referred to several
of many texts written on the subject.

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IEEE Power & Energy Magazine - July/August 2019

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - July/August 2019

Contents
IEEE Power & Energy Magazine - July/August 2019 - Cover1
IEEE Power & Energy Magazine - July/August 2019 - Cover2
IEEE Power & Energy Magazine - July/August 2019 - Contents
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IEEE Power & Energy Magazine - July/August 2019 - Cover3
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