Direct cooling with water is ideal, provided you deal with the obvious difficulties. An alternative is to indirectly cool with water. Cool the motor with air that is chilled by water. Water is generally cooler than the ambient air. A simple pump and radiator will chill the air. No fancy motor or motor parts needed.
--- In electricboats@yahoogroups.com, "Jeremy" <jeremy_harris_uk@...> wrote:
>
> It's a viable cooling strategy, if you can get the cool water where it's needed. It's the motor windings that generate the heat, so finding a way to get coolant as close to them as possible is key.
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