You make it sound like I'm going to have a heat dissapation problem. However, from a practical standpoint, that dosn't seem to be the case. At full throttle, the gearbox will generate less than 150W of heat and the surface area of the casing seems to take care of that. In addition, I know that my motor windings stay below 80C after more than 1 hour at full throttle (5.1kW), with the motor casing cooler than that. I have no external fans or cooling system.
Do you have any data on how hot your motor runs when you're pushing 5kW (or whatever your system is designed for) through your driveline for an extended period of time?
One of the things that I like about this forum is that we can get go farther than mere theories and into the real world examples of how our systems actually perform.
Eric
--- In electricboats@yahoogroups.com, James Sizemore <james@...> wrote:
>
> One thing your gear box does not do that a lot of the bolt to a large hunk of aluminum/steal setups do. Is give you anything to dump heat to. Your motor and gear box both are heat generators. My motors are bolted to a very substantial chunk of aluminum nicely painted black, which should make for quit the heat sink. If I ever push the motors to there limits that might come in handy. Thankfully we have a fair number of great vendors to choose from. And we can each pick the vendors we think makes the best product for our individual needs.
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> Mastervolts pods would be the ultimate in heat distribution submerging the entire motor in water, maybe someday we will get one of there customers on this forum. I would love to know what all they get with the motor, and the cost and finish of the setup.
>
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> On Sep 17, 2011, at 2:47 PM, Eric wrote:
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> > Another option is a Browning 3201 gearbox. The ME0907 should bolt directly to it. They have a built in thrust bearing, 97% overall efficiency including bearings and seals, 10,000 hours MTBF and come in 10 different gear ratios. To me, a single component that handles everything (reduction, thrust, motor mount, etc.) helps keep it simple.
> >
> > Fair winds,
> > Eric
> > Marina del Rey, CA
> >
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