Power & Energy Magazine - Spanish - July/August 2019 - 104
Para entender
por qué
fracasó el
motor de
Sprague,
necesitamos
revisar el
enfoque
tecnológico de
fines del siglo
XIX.
Este campo más fuerte produce más
torque, lo que provoca que el motor aumente la velocidad hasta que se logre
un equilibrio del torque del motor y el
torque de la carga. El equilibrio ocurrirá a una velocidad un tanto menor que
la presente al darse el torque de carga
adicional. Esta reducción moderada de
velocidad es una característica del motor en derivación.
El motor compuesto acumulativo tiene un campo en serie y uno
de derivación. Un torque de carga
creciente provoca un aumento en
la corriente de la armadura similar
al motor en derivación. Esta mayor
corriente de la armadura también
fluye a través del campo en serie,
que fortalece el campo en derivación. Como resultado, la FCEM de
la armadura se desarrolla a una velocidad un tanto menor que para un
motor en derivación. Normalmente
se ve este motor como uno en derivación con algunas características
en serie. Suele utilizarse en el servicio de ascensores: el campo en serie
se utiliza para poner en marcha la
cabina del ascensor y con frecuencia
hace cortocircuito una vez que funciona a pleno rendimiento.
El campo del motor en serie transmite la misma cor riente que lleva
la armadura. Al igual que con otros
104
ieee power & energy magazine
motores, a medida que aumenta el
torque de carga, se reduce la velocidad, permitiendo un mayor flujo de
corriente. En este caso, sin embargo, esta corriente fluye a través del
campo en serie y la armadura. Debido a la gran cantidad de corriente
en la armadura, el campo en serie es
mucho más fuerte que el campo en
derivación similar. La FCEM de la
armadura se desarrolla a una velocidad significativamente menor que
con los otros motores. Esta reducción de velocidad considerable es
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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 - 123
Power & Energy Magazine - Spanish - July/August 2019 - Cover3
Power & Energy Magazine - Spanish - July/August 2019 - Cover4
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