Submerged Motor
Submerged Motor
(OP)
We all know brushed motors in fuel tanks last 1000 's of hours
Why then with my brushed motor in my Radio Sub is the brush life about 5 minutes ,
Chlorinated pool water ,,,
low power
Suggestions appreciated
Why then with my brushed motor in my Radio Sub is the brush life about 5 minutes ,
Chlorinated pool water ,,,
low power
Suggestions appreciated





RE: Submerged Motor
Small brushless motors for computer fans are now down to a couple of bucks.
Why even bother with a brushed motor?
Mike Halloran
Pembroke Pines, FL, USA
RE: Submerged Motor
The water resistance wont confuse it ? and the back EMF for the motor timing wont get thrown out?, I hope not
Subs for a kids charity have a go meet
RE: Submerged Motor
RE: Submerged Motor
Read this thread:
http://www.eng-tips.com/viewthread.cfm?qid=337857
Mike Halloran
Pembroke Pines, FL, USA
RE: Submerged Motor
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Submerged Motor
RE: Submerged Motor
If you just can't hack a waterproof gland you can always go with a magnetic drive that has no penetrations. You can put everything in a single waterproof compartment. Whatever you do, you need to make sure you have a safety pressure release for a compartment. A rubber boot over an opening or something similar. If you short some batteries in a closed compartment you will end up with a bomb. A guy opened the compartment lid on a scuba power tow unit that had a water shorted battery in it. The cover came off like a bullet and hit him in the face killing him. Be safe.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Submerged Motor
silicon weather sealant around dc motor brushes/commutators Helpful Member!(9)
thread237-343881: silicon weather sealant around dc motor brushes/commutators
See also:
http://eng-tips.com/search.cfm?pid=237&action=...
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Submerged Motor
No silicon near the brushes
I did get a good 5 minutes each of performance before both brushed motors died
Fully submerged
Have now a 40A ESC and a Brushless innrunner on with bronze bearings substituting the ballraces, no pool time yet
This has been proven in tap water , dont know about pool water ,
What flush or dunking would you recommend after each running session , WD 40 ---- Innox ,,, Kero ,,,
RE: Submerged Motor
RE: Submerged Motor
RE: Submerged Motor
Mike Halloran
Pembroke Pines, FL, USA
RE: Submerged Motor
I will report if my ESC or motor dies on operation
RE: Submerged Motor
RE: Submerged Motor
This is just not correct application of an electric motor. Brushless is not a solution. Even if it were, do you realize it is controlled totally different than that brush motor? Much more complex driver required - did you plan to replace that too?
If it must run IN THE WATER and you want longer than 5 minute life you may want to consider a rubber band.
Or just spend a few bucks more and buy a sealed motor designed for that use - there are plenty out there - as evidenced by simple google search "waterproof submersible electric motors" - heck there even 12v ones on ebay. For occassional use, one of these in a brush motor design should last nearly forever.
www.KilroyWasHere<dot>com
RE: Submerged Motor
RE: Submerged Motor
www.KilroyWasHere<dot>com
RE: Submerged Motor
RE: Submerged Motor
www.KilroyWasHere<dot>com
RE: Submerged Motor
http://m.youtube.com/watch?v=2mVteXOBo0Y
RE: Submerged Motor
Flushed in tap water , so far OK , running at approx 1 metre depth , thats about the limit of my 36 Megahertz radio reception