IEEE Power & Energy Magazine - July/August 2019 - 94

Field Winding
Horseshoe Magnet
Armature

Primary Gearwheel
(Outline)
Secondary
Gearwheel

Mounting
Spring
Axle
Bogie Transom

Road Wheel
Top of Rail

figure 6. Sprague's wheelbarrow motor mounting arrangement that solved
the problem of meshing gears with a moving wheel axle. [Copied with
permission from Dr. Piers Connor, PRC Rail Consulting Ltd., The Railway
Technical Website, "The Early History of the DC Traction Motor" (http://
www.railway-technical.com/trains/rolling-stock-index-l/the-early-history-ofthe-dc.html).]

Transformer

Bags
CUSTOM FITTED
U.V. STABILIZED
FIRE RETARDANT AVAILABLE
WEATHER PROOF

1.800.231.6074 * reefindustries.com

94

ieee power & energy magazine

figure 7. A drawing for a Sprague motor showing the method of reconnecting
fields to allow for motor starting and
constant-speed operation. (Source: U.S.
Patent 315180, 7 April 1885.)

In "Some Facts About Electric Traction," Sprague said about the Richmond
motors, "No resistance coils whatsoever
are used by us in handling the motors,
the entire regulation being performed
by commutations of the circuits, and
by the character of the regulation which
is characteristic of a series motor on
a constant potential circuit, which as
it slows down takes more current and
pulls very much harder." He obviously
understood how a field in series motor armature will produce more torque
for starting. However, he switched the
series connection out after the car was
underway. This would explain why his
problems were more prevalent when
the car was moving. When climbing a
july/august 2019



http://www.railway-technical.com/trains/rolling-stock-index-l/the-early-history-of-the-dc.html http://www.railway-technical.com/trains/rolling-stock-index-l/the-early-history-of-the-dc.html http://www.railway-technical.com/trains/rolling-stock-index-l/the-early-history-of-the-dc.html http://www.reefindustries.com

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
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IEEE Power & Energy Magazine - July/August 2019 - Cover3
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