[Amps] Air temps leaving the amp.

[KA4INM]

   On 02/03/14 10:24, Jim W8ZR Garland wrote:

> This raises an interesting issue. How does one reduce the impeller speed on
> a blower with a 120 VAC motor (capacitor start)? I've done some tests on
> several blowers (3370 rpm) and find the rpm doesn't vary appreciably as the
> voltage is varied over a significant range. Once the voltage gets low
> enough, of course, the blower stalls, but the rpm doesn't vary with the
> voltage. I suspect this is an inherent property of induction motors. I first
> discovered this effect years ago when I tried to reduce the blower speed of
> a Rotron blower in an 8877 amp. I switched in a 24V transformer to lower the
> voltage from 120V to 96V, but discovered it didn't make much difference.

   You simply restrict the intake air flow which unloads the motor.
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.