DC motors and efficiency

I have a general question about DC electric motors. I have found a
servo motor with the right size and price to meet my application.
However, it's best efficiency is within the continuous torque range
that places the rpm higher than what I want (2700). However, this is
an underwater propulsion application and so the motor will have plenty
of cooling.
1) Can I operate this motor at a lower rpm (and thus higher torque for
the same power out) and still maintain efficiency being I am providing
2) Basically, how does complete cooling effect the efficiency and
continuous torgue ratings of these motors?
Thanks for any insight.
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What about a gear?
Reply to
Sjur Vestli

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