My new BIG Brushless motor
 

Guys, thought you might get a kick out of this. I fix these things at work. I placed a dime on the mounting flange so you could get an idea of the size of this thing.

It is a submersible motor, and is water cooled. It has a hermetically sealed stator. This one is a little guy (only 75HP).Attachment 1075

Holy $h#t!! That thing is a MONSTER!!! Someone should fit it in a 1/10 truck:) ;)

What is it used for?

It is a submersible pump motor. This particular unit powers a pump (which I also rebuild) that goes inside a reverse-osmosis (RO) filtration system. This is a specially built motor that is made entirely of 316 stainless, has a special mechanical seal, and has a 17-4 PH mainshaft.

This particular motor and pump is heading back to a semiconductor manufacturer after being repaired. This particular customer of mine has about 15 of these units that run 'round the clock supplying clean water to the entire chip-fab.

Fabs from all over the country send their stuff here to be fixed. I also repair the pumps for Coca Cola that make Dasani drinking water.

It's a lot of work, -but it's still pretty cool stuff to work on. As a matter of fact, a lot of 3-phase AC induction motors are run on variable frequency drives (VFD's) that change the frequency of the AC, -esssentially doing the same thing as our ESC's do. The difference of course being that our ESC's are a form of "chopped DC", but the principle and operation is very very similar.

This one weighs in at almost 500 pounds!

Better build a big truck!

That's awesome! I'm curious, how much would a motor like that go for?

This one new is around 6 grand.

Thats not that bad.;)

Only 75 HP eh? That's 55,950 watts! :dft002: It would need a "few" batteries. And that must weigh quite a bit! A bit much for an R/C truck, unless it was a life size go cart or something. And for $6k, you could get a few LMTs and ESCs, with some cash left over for batteries. :)

What's the kV rating and max rpm of that motor - just for giggles?

A life size semi more like.

These aren't rated using the kV method like the DC setups are. The speed on AC induction motors is controlled by the frequency of the AC power. Here in the states, 60 Hz is the normal frequency on the mains.

You can vary the speed with a VFD (variable frequency drive), but some motors don't take kindly to being operated below their rated speed (heat buildup).

This particular motor runs at 3525 RPM at 460 Volts/60Hz. It is rated at 768 foot pounds of startup torque, and comfortably operates at 128 foot pounds when it is up to speed. Because it is water cooled, it can run well into the nameplate service-factor without too much concern. When I test this one on Monday, it will likely run somewhere around 105 amps at 480 volts.

Testing pumps around a 480 panel isn't for everyone, especially when hoses blow off (which does happen).

Oh well, gotta make the bacon so I can buy my playtoys. :027:

I once met a guy that built brushless motors for a living. I remember him telling me he worked on some really big brushless motors, like 400kW+. I showed him my little BASIC XL, and he seemed pretty impressed that something so small could have such a high power output.

Don't they use BL motors on the pods that hang under the big ships?

i thought i heard my neighbour talking about that..
6k is not bad, considering it's power/price ratio.

Possibly serum. I know the guy I spoke to made them for trains, but I presume they must be used in all sorts of applications

I would have to agree. The efficiency of these systems we play with are really good.

That's why I can't figure some of these hard-headed old-school guys that grumble about brushless motors.

Some people have a really difficult time embracing new technology and change. That's unfortunate, because brushless RC is here to stay, like it or not.

Just think what we'll have five years from now in BL or battery technology?

Kinda makes me wonder what lies on the horizon. I wonder if Lipoly's will get even smaller?

Whatever happens, if nothing else, maybe it will make the stuff we have now less expensive. Even in the last year or so, Lipoly's have dropped in price pretty significantly, -I like it!