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Re: [Amps] Centrifugal Blowers

To: Byron Tatum <>
Subject: Re: [Amps] Centrifugal Blowers
From: Roger - W7TZ <>
Date: Thu, 27 Jan 2022 10:54:35 -0800
List-post: <>
I used to have a catalog that described how to slow blowers and it depended
on the type of motor. One type you can use a resistor in line, the other
type requires the use of an ac capacitor in-line.

73, Roger


On Thu, Jan 27, 2022 at 7:03 AM Byron Tatum <> wrote:

> Thanks Guys-    I appreciate all the suggestions on repairing my blowers.
> The units I have are Kooltronics KBB47-5 with a motor #7162-0802. This
> motor is 3400 RPM at 60 Hz. I am looking for a lower speed motor as this
> blower is excessively noisy and I can get by with less airflow in SSB/CW
> service. I need to stay with my existing housings as I cannot find any
> replacements that have same bolt hole pattern (2-5/8" square) or flange
> dimensions (3-1/4" square).    What happens to these motors if I reduce the
> voltage to slow them? Or, do they work this way, in other words is the
> frequency of AC what should be varied? Say I was to lower AC voltage to 60
> or 70 VAC, will the motor be negatively affected?Thanks,Byron W5FH
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