>Rich's comment
>
>> If that does not quiet it down, you may need to
>>purchase a transformer that is designed to work satisfactorily on 50Hz
>>mains.
>
>does bring out the fact that although 60Hz to 50Hz doesn't look that
>much - only (!) 20%, it can have a major effect on transformers that are
>a bit light on iron. Also, it's worth remembering that most blowers and
>fans use induction motors, so they run 20% slower; anything at all
>marginal on airflow at 60Hz could be in trouble. Is the quantity of air
>proportional directly to blower speed, speed squared or what? - Rich,
>this sounds like something in your area of expertise.
Beats me, Peter. However, the delivered air pressure in mm of water
column does seem to drop off pretty fast as a centrifugal blower's
rotational speed decreases.
cheers
Rich---
R. L. Measures, 805-386-3734, AG6K
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