When a motor runs on current it gets hot. Fans need to be strategically mounted and ducted to be effective. Ambient temperature can be changed by introducing air from another part of the boat. Ducting is necessary to draw air out of the inside of the motor. Motors have omnidirectional fans which by their nature a compromise. Accentuating the cooling system increases power and efficiency. Electroprops have incredible cooling systems with fan(s), ducting, and some with radiators and pumps.
To make power you need to make high RPM. To make efficiency you ned to make low propeller RPM, hence the need for reduction. Without reduction the motor needs to be significantly oversized for the application, but it can be done. Up to 48 volts is a bargain. Going to 72 volts adds thousands of dollars but at higher power levels is desirable for simplicity.
On Feb 28, 2016, at 3:24 PM, William Grace jwsys@iconz.Co.Nz [electricboats] <electricboats@yahoogroups.com> wrote:
It is easy enough to fabricate and install an additional small fan to provide cooling air to a slow turning motor generating high torque. Probably cheaper than a reduction gearbox; certainly easier. Computer cooling fans use negligible power and may be adequate.
Cheers
Bill Grace
Wellington
New Zealand.
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Posted by: "james@electroprop.com" <james@electroprop.com>
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