only universal (AC/DC) motors are amendable to speed control via a dimmer,
and then only if the dimmer can handle the back emf from the motor.

"SteveB" wrote in message
...
I want to put a low rpm motor on a pump to aid a thermosiphon device. It's
for an outside shower, and I think the thermosiphon would just move too
slowly. I found a pump, but it needs a drive. Would I be better off to
just buy a low RPM motor, even a 12v. DC and run it off a transformer, or
would an AC motor work with a dimmer without damage? The resistance on
shaft drag would be minimal, so a small 12v. DC should handle it.

Hint: I got a couple of 1.3 and 1/4 hp motors laying around.

Steve




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