On 1/17/18 6:20 AM, Patrick Greenlee wrote:
Tony, Yes some variable speed motors (vice multi-speed) can cause
interference. I lucked out with my new variable speed one HP air
handler and don't detect any interference. Likewise with the other two
older variable speed air handlers. I can't detect a difference in noise
with all three running vs none running.
There are a whole variety of ways to do variable speed motors - some are
done with switching combinations of windings, some are with variable
speed drives (synthesising sine waves), some are clever schemes using
variable voltage.
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