Hi Orest,
Propusion Marine has two solutions for water cooling. The first is a retrofit cooling unit bolted between the air-cooled motor and the gear reduction unit. This setup along with forced air, has delivered a measured drop in winding temperatures of 30C under full load. You can see it here:
http://www.propulsionmarine.com/electric/7-kw-water-cooled-electric-drive
The second solution uses a water cooled motor, I think that Perm Motors in Germany manufactures the actual motor. This page has pics that show some of the internal cooling passages:
http://www.propulsionmarine.com/electric/10kw-water-cooled-electric-drive
You'll notice that James rates his systems more conservatively than the motor manufacturer does, he has observed that most drive systems installed in the bilge of a boat do not dissapate heat as well as the same motor on a test bench. So his ratings are based on observed performance, getting temperature readings from sensors installed in the motor windings while in use in a boat. His drive systems will not overheat when run continuously in a boat at rated capacity. I don't know if the other drive system vendors have collected this type of objective data from actual conversions.
I personally know that my air-cooled 5.5kW rated system will not exceed 100C while consuming a full 6kW of power deep in the bilge of my boat, the manufacturer of the motor says that the windings must be kept under 150C.
Fair winds,
Eric
1964 Bermuda 30 ketch, 5.5kW Propulsion Marine drive, 8kW Lithium batteries
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Orest Iwaszko <orestyko@...> wrote:
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> Has anyone used a water jacket of some kind or water tubes like a still from salt water to cool the electric motor . There may be a thread already if someone could steer me to it. Or is it feasible ?
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> Thanks Orest Port Alberni.
>
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