Re: AC Induction Motors burning out under no load?

On Sun, 10 Jul 2005 03:04:03 GMT, Rich Grise <richgrise@xxxxxxxxxxx>
wrote:

>On Fri, 08 Jul 2005 22:43:32 +0200, Mark wrote:
>
>> Not exactly electronics but most probably the best place to ask. I am
>> looking into the design of a blower unit to inflate bouncy castles
>> etc. The normally use a 1.5HP, capacitor start AC Induction motor with
>> an impeller housed in a Snail shell type housing. One comment that has
>> come up during my research into a design, is that users of these
>> things are saying that if a blower is left running but not inflating
>> anything, they burn out after a while under no load. Is this a motor
>> problem or is it a cooling problem, any idea's.
>
>It could be a problem if the motor depends on the flow through
>the blower for its cooling air. If the motor can still get cooling
>air, and it's only driving a squirrel-cage, I'd say you've got
>no worries. IF the motor itself still has good airflow, even when
>the squirrel-cage is totally blocked off and screaming like
>a banshee, THEN it's probably OK.
>
>The thing is, keep the motor cool.
>
>Most commercially sold motors have some kind of thermal cutout these
>days anyway, don't they?
>
>Have Fun!
>Rich
Yep rich, we are slowly coming to the conclusion that we need to
include a small amount bleeding from the air chamber through to the
motor chamber to overcome this problem.
.

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