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Underwater electrics?

R

raid517

Jan 1, 1970
0
Hi I am considering a project to design a very simple underwater power
tool type device. The project is essentially very simple - and
consists of nothing much more than a basic electric motor, a
rechargeable battery and a gearing mechanism.

The problem is I'm not sure how I can make the recharging mechanism
for this work?

I mean, is there any way to come up with a recharging mechanism which
would not be affected by water? The power tool must be capable of
being quickly recharged, so that as soon as one takes it out of the
water you would need to begin recharging it pretty much immediately.
This needs to be very fast and easy to do - but at the moment I'm
finding it hard to imagine a mechanism which would not cause the
recharging points on the device to be shorted out if the device was
placed on the charger while wet.

The device would consume quite a lot of energy - probably equivalent
to a 12V power drill. (Although this project is not an attempt to
design an underwater power drill).

Has anyone here got any insight on this? Or perhaps you are interested
in helping out in order to help me build/market this device...?

Any input is welcome...

Kind regards,

GJ
 
T

The Al Bundy

Jan 1, 1970
0
raid517 said:
Hi I am considering a project to design a very simple underwater power
tool type device. The project is essentially very simple - and
consists of nothing much more than a basic electric motor, a
rechargeable battery and a gearing mechanism.

The problem is I'm not sure how I can make the recharging mechanism
for this work?

I mean, is there any way to come up with a recharging mechanism which
would not be affected by water? The power tool must be capable of
being quickly recharged, so that as soon as one takes it out of the
water you would need to begin recharging it pretty much immediately.
This needs to be very fast and easy to do - but at the moment I'm
finding it hard to imagine a mechanism which would not cause the
recharging points on the device to be shorted out if the device was
placed on the charger while wet.

The device would consume quite a lot of energy - probably equivalent
to a 12V power drill. (Although this project is not an attempt to
design an underwater power drill).

Has anyone here got any insight on this? Or perhaps you are interested
in helping out in order to help me build/market this device...?

Any input is welcome...

Kind regards,

GJ

Maybe you can use the principle of a electric toothbrush? Charging works
like a transformer, but then the primary is the base station and the
secondary is inside the toothbrush. The only thing you have to do is to
scale it to the right power that you need for charging.

Al
 
R

raid517

Jan 1, 1970
0
Ok, I'll look at that thanks.... I don't own an electric toothbrush,
so are you saying that it has a mechanism that is unaffected by
moisture?

Would it even be possible to scale it up to anything approaching the
12v of (for example) an electric drill?

Any mechanism like this would be interesting to me.

GJ
 
M

Matthew Snape

Jan 1, 1970
0
Perhaps you could use some sort of dynamo to transfer the power from a
motor to a recharge circuit. That way the only connection would be
mechanical. If the device already uses a motor it could use the same
one as a generator.
 
Hi I am considering a project to design a very simple underwater power
tool type device. The project is essentially very simple - and
consists of nothing much more than a basic electric motor, a
rechargeable battery and a gearing mechanism.
and every thing else


Ok are you designing this Commercial Dive industry? If so you don't
need a battery. Most dive umbilical's communication systems have
extra wires that aren't used. Back up wires. Also you could power it
using a battery charger. When I used desco pot(hardhat) we would just
power are lights using this simple method. Now that I am a electrical
engineer what was I thinking.

For power tools I love air or hydraulic. They work just as good
underwater as they do top side. And a heavy jack hammer will give you
a great massage. The best you ever had.

If its for scuba then you would have to design a container to keep the
water out. If you want a real simple one go by pvc pipe 3inch and two
end caps and some epoxy and buy a Black and Decker 8-18volt cordless
drill batteries pack and have fun. You may want a pressure relief
valve but you will drill holes for wires and this will be its weak
point incase batteries release a lot of gas. Or you could install the
valve using a drill and tap.

Once your idea works then you can design a real pressure housing.
 
G

gothika

Jan 1, 1970
0
and every thing else


Ok are you designing this Commercial Dive industry? If so you don't
need a battery. Most dive umbilical's communication systems have
extra wires that aren't used. Back up wires. Also you could power it
using a battery charger. When I used desco pot(hardhat) we would just
power are lights using this simple method. Now that I am a electrical
engineer what was I thinking.

For power tools I love air or hydraulic. They work just as good
underwater as they do top side. And a heavy jack hammer will give you
a great massage. The best you ever had.

If its for scuba then you would have to design a container to keep the
water out. If you want a real simple one go by pvc pipe 3inch and two
end caps and some epoxy and buy a Black and Decker 8-18volt cordless
drill batteries pack and have fun. You may want a pressure relief
valve but you will drill holes for wires and this will be its weak
point incase batteries release a lot of gas. Or you could install the
valve using a drill and tap.
If the app is low voltage you can have external posts on the casing.
I use stainless steel bolts with steel washers with silicone
washers/bushing. You can even seal them with silicone rubber sleeves
hermetically sealed onto the power cables.
 
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