Power & Energy Magazine - Spanish - July/August 2019 - 106
y debilita el campo en derivación.
Esto significa que la FCEM se reduce sin una (gran) caída de velocidad.
La FCEM normalmente disminuye
por una reducción en la fuerza del
campo más que por una reducción
en la velocidad. Esta FCEM menor
permite un aumento en la corriente
de la armadura, llevando el torque
del motor a un punto en que coincida
con el torque de carga. Los motores
compuestos diferenciales casi nunca
se utilizan. Tienden a ser inestables.
Si se presentan subidas de corriente,
el campo en serie puede dominar el
campo en derivación y hacer que la
armadura rote al revés. Su característica más destacada, sin embargo, es
su torque de velocidad con una curva
muy plana. No obstante, la desventaja
es que, al sobrecargarse mucho, consumirá una gran cantidad de corriente de la armadura en su intento por
mantener una velocidad constante.
Richmond,
Virginia,
1887-1888
Los motores Richmond d e Sp r a g ue
eran muy similares a
los motores que había
estado fabricando durante varios años. El
gráfico 6 muestra uno
de sus motores instalado en un tranvía.
Eran motores compuestos diferenciales.
La patente estadounidense 315180 de Sprague, emitida el 7 de
abril de 1885, detalla
su diseño. El gráfico
7 es un diagrama que
muestra las conexiones para los campos.
La letra A indica los
bobinados de la ar-
Los parámetros
de diseño
para las
proporciones
del campo
de motor se
conocían
como Ley de
Sprague, y
puede que se
haya mostrado
reacio a
renunciar a
un diseño por
el que era
famoso.
madura y la B indica
los bobinados de los
polos de campo. En
este diagrama, que
acompañaba la solicitud de patente, Sprague describía "una
disposición por donde
el motor en derivación
simple podría pasar a
ser uno diferencial...
la relación entre la
bobina en derivación
y en serie podría cambiarse". El conmutador utilizado por el
operador para cambiar las conexiones
de campo se muestra
en D. En este caso, se
utilizó el término conmutador en su sentido
general: un dispositivo que conmuta. El
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6874
800-722-8078 * pr-tech.com
106
ieee power & energy magazine
julio/agosto 2019
http://www.pr-tech.com
Power & Energy Magazine - Spanish - July/August 2019
Table of Contents for the Digital Edition of Power & Energy Magazine - Spanish - July/August 2019
Contents
Power & Energy Magazine - Spanish - July/August 2019 - Cover1
Power & Energy Magazine - Spanish - July/August 2019 - Cover2
Power & Energy Magazine - Spanish - July/August 2019 - Contents
Power & Energy Magazine - Spanish - July/August 2019 - 2
Power & Energy Magazine - Spanish - July/August 2019 - 3
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Power & Energy Magazine - Spanish - July/August 2019 - Cover3
Power & Energy Magazine - Spanish - July/August 2019 - Cover4
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