Recently, Sears has been emphasizing that their lighter duty air
compressors have universal motors. Is this a good thing? I've read that
UMC motors allow extension cord use, provide higher startup torque and
are lighter in weight. But, does all that come at the cost of long-term
durability vs. an induction type motor?
Universal motors run fast, hot, and noisy. They need brushes replaced in time
and after enough use the commutators were out. Only typically used on handheld
tools where power/weight ratio or cost is the biggest factor. Or if you need to
run off DC like old portable welder/generators provided.
I would never buy an air compressor with a universal motor, mainly since
whatever it's connected to is almost certain to be junk.
This is Turtle.
Sear has on their cheap models of air compressors a very cheaply made compressor
and the universial motor will probley out last the compressor anyway. I can see
their point here in why puy a 30 year running life motor on a 10 year running
life compressor. Just put a 10 year motor on a 10 year compressor and have
everything matching up to last about 10 years.
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