Freescale (www.freescale.com) describe en aplicación la elaboración de un control de ventilador de techo utilizando su microcontrolador MC9RC08KA2. La idea básica consiste en utilizar un control de fase tradicional con Triac produciendo los pulsos de control a través del microcontrolador, como muestra la figura 1.

 

Figura 1 - Principio de funcionamiento del control de fase
Figura 1 - Principio de funcionamiento del control de fase

 

En este circuito el punto de producción del tren de muñones determina cuánto del semiciclo de la tensión de la red pasa al motor y por lo tanto su velocidad de rotación. El instante de la producción de este pulso en función de la frecuencia y tensión de la red son generados por el microcontrolador.

Para mayor seguridad de operación el disparo se realiza a través de un optodiac que aísla el circuito de baja tensión del microcontrolador del circuito de alta tensión del motor. El circuito completo de la aplicación se muestra en la figura 2.

 

Figura 2 - Circuito completo del control de motor de ventilador de techo.
Figura 2 - Circuito completo del control de motor de ventilador de techo.

 

La aplicación tiene en cuenta que muchos motores de fase única poseen un devanado auxiliar para obtener más torque, como muestra la figura 3.

 

Figura 3 - Enrollamiento auxiliar en el motor.
Figura 3 - Enrollamiento auxiliar en el motor.

 

Conforme podemos ver por el circuito este devanado es accionado por una llave centrífuga que permite acelerar el motor de modo sincronizado con su movimiento. Este circuito auxiliar se desconecta cuando el motor alcanza el 75% de su velocidad máxima. Sin embargo, con el uso de un circuito electrónico de control es posible eliminar la llave centrífuga como muestra la figura 3 y así obtener el mismo rendimiento.

 

Figura 4 - Uso de la tecnología PSC para eliminar la clave centrífuga.
Figura 4 - Uso de la tecnología PSC para eliminar la clave centrífuga.

 

Freescale tiene una placa de demostración para este proyecto. Los interesados pueden consultar a esta empresa.

 

 

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