You might try to find a small centrifugal blower to establish some positive
pressure in airflow, which can be directed into one end of the motor (with
some flexible tubing).

Fans don't push much air when a restriction is encountered (the interior of
the motor case, or being piped to another location).

A small AC motor blower that doesn't have the blower motor in the air intake
stream, so as to not add heat to the cooling air, will potentially provide
years of service with only some routine cleaning to remove dust.

Dayton, among other manufacturers, make small blowers that will be
well-suited for the purpose of cooling small motors.

The only additional feature that one of these small blowers might need,
would be to add a screened cover for the air intake to reduce the chances
that big pieces of debris from entering the intake.

WB
..........
metalworking projects
www.kwagmire.com/metal_proj.html



"rashid111" wrote in message
...
Assuming one has a fairly straight approx 4.5" OD x 10" long round
motor with smooth surface, what would be a good way to get some heat
sink type of deal ?

I am thinking about

A) getting say 3/8 or 1/2 alum channel, cutting it into pieces the
length of the motor and attaching the "strips" flat bottom toward the
motor around the circumference. 3-4 zip-ties holding the Us against
the motor

B) doing something with copper or alum sticky foil, where you create
as many folds as possible in a "pleaded" fashion - infinitely messier
affair, but would it be more efficient in dissipating the heat ?