At the classes I've gone to, the teachers said that stopping and starting
was worse, and that once they get up to speed, there's very little strain on
a motor of this type. I don't remember anyone ever asking them why. I always
assumed it was from the heat generated while the armature was straining to
get up to speed but still didn't have enough air flow to cool it properly.
As for the bearings, I don't know if sleeve or ball bearings makes a
difference, but I assume the blower wheel must be balanced properly to cause
minimal bearing wear.

"Mark" wrote in message
oups.com...

Bob wrote:
It's
much worse to stop and start them all the time. Once those motors get
going,
they have very little strain on them.



Could you explain why?

The bearings are being worn whenever the shaft turns.
What typically breaks on these,....... the bearings.

What wear is caused by starting and stopping the motor? These
typically do not have a centrifugal switch or anything like that so
what's the problem with starting and stopping?

On a normal winter day my furnace and blower run 25% of the time,
seems like a waste of energy and wear and tear on the blower bearings
to run the blower 24/7.

Mark