I'd say that cooling the motors is always a very good thing to do, if you can find an efficient way to do it. Because the motor winding resistance is strongly temperature dependent (it increases with increasing temperature) the cooler you can keep the windings the lower their resistance will be and hence the lower their resistive losses will be. A side effect is that because cooler windings have less loss they don't produce as much heat for a given torque, so keeping them cool even when you're not drawing a lot of torque from them is beneficial.
Most motors don't easily lend themselves to water cooling, without some fairly difficult modifications, which is a shame, as we are almost always surrounded by water that is both cooler than the air around us and around 24 times better than it at getting rid of heat. If you can arrange direct water cooling of the motor windings, then there will be both a modest efficiency gain in normal use and a significant increase in the maximum continuous current that the motor will handle.
Jeremy
--- In electricboats@yahoogroups.com, Michael Mccomb <mccomb.michael@...> wrote:
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