Power & Energy Magazine - Spanish - July/August 2019 - 100

hasta que los procesos por los que funcionaban los motores fueran mejor
comprendidos, no solo por los investigadores, sino también también por los
ingenieros en ejercicio.
Otro problema era la alta resistencia de la armadura. Era significativamente más alta que en una máquina
moderna. Existían varios motivos para
esto. El enfriamiento mal diseñado de
la armadura era un factor. El calor se
generaba tanto por el flujo de corriente en los conductores de la armadura
como por las corrientes de Foucault en
el núcleo no laminado de la armadura.
Este calor aumentaba más la resistencia de los conductores de la armadura. Además, los conductores solían
conectarse en serie alrededor de la
armadura en lugar de hacerlo en un
grupo de rutas paralelas. Estas series,
o bobinas serie, como se les llamaría
más tarde, permitía el uso de solo dos
escobillas, pero aumentaba la resistencia de la armadura.
En 1887, el año en que comenzó el
proyecto de Richmond, el motor más
común era una máquina de CC con los
polos de campo conectados en paralelo
a la armadura. Este tipo de máquina llegó a ser llamada motor en derivación.
Debido a la alta resistencia de la armadura, la velocidad de un motor podría
disminuir en un 5  % desde una carga
nula hasta una carga completa. Esta regulación de velocidad no se consideró
aceptable para que un motor eléctrico
reemplazara un motor a vapor.
Prácticamente todos los motores a
vapor se utilizaban para hacer funcionar molinos o fresadoras con los que
sus propietarios se ganaban la vida
por el volumen de trabajo que se podía hacer en cierto tiempo. A medida
que mejoraba el negocio, se agregaron
más máquinas al eje de transmisión
del motor a vapor. Cada máquina de
producción accionada requeriría una
cierta cantidad de torque para producir
piezas a una cierta velocidad. Con más
máquinas, se requeriría más torque del
motor a vapor. Esta mayor carga de torque causaba que el motor a vapor disminuyera la velocidad y, consigo, toda
la línea de producción. Si no se inven100

ieee power & energy magazine

taba algún dispositivo para aumentar
automáticamente el torque de salida
del motor, los niveles de producción se
reducirían.
En 1788, James Watt inventó el
regulador del motor a vapor para ese
fin. Dentro de los límites de control
de su regulador (a menudo un contro-

lador proporcional simple), el motor
a vapor era una máquina de velocidad
constante. Su curva de torque/velocidad era (predominantemente) plana. Debido a la regulación deficiente
del motor eléctrico, se pensaba que
sería necesario algún medio regulador, como el del motor a vapor, para

®

julio/agosto 2019


http://boldtransmission.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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