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Feb 24, 2020, 09:45 PM
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Motor water proof

Interested in buying eBay thruster for rov and bait boat, so basically what I saw are just brush less motor mounted on base with propeller bolt on shaft, no water seal at all. Are those motor will last reasonably long? Just run them in water and dry after will be enough to keep them?
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Feb 25, 2020, 12:35 PM
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Depends on both the water and the motor. Lubricating after use as well as drying, if it is salt water insulation checks will be needed as well.
Feb 28, 2020, 01:37 PM
Out of the way, Peck!
Buy any brushless motor, replace the bearings with ceramic bearings, coat the stator wires with epoxy resin thinned with denatured alcohol to keep the copper isolated from corrosives such as salt water. Rinsing with fresh water post-mission is a good idea.

Boat props are formed to be very efficient in forward, but they are very inefficient in reverse. An ROV prop needs to run both forwards and reverse alot, so the prop works better if the blades are symmetrical. Try buying a 6-blade EDF and cutting off 3 blades. Water is alot thicker than air, so a 3-blade prop is the most efficient.

Since water is so much harder to move than air, you need a high-torque brushless motor. 2200kv might be good for a quadcopter (drone), but they overheat (or the ESC does) when trying to move a heavy ROV through thick water. Look for low-kv motors, like this 400kv one...

As well, a 20-amp ESC might be fine for a drone in air, but you'll need a higher-amp one for water. If you coat it with epoxy resin you can even immerse it in water for cooling. Or fill a separate WTC with mineral oil (which is non-conductive) and put the ESC's in that. I use aluminum pipe for my WTC's because it transfers heat to the surrounding water the best and just coat every surface in epoxy.

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