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gemini motor


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Glen
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gemini motor

thought this could be an interesting read... still not sure how it works myself lol

http://www.abc.net.au/newinventors/txt/s1201795.htm
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Post Sun Jan 01, 2006 5:27 pm 
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dyrodium
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hehe yeah i saw that a while ago on the show... anyone up to asking for some samples? Razz Hmmm is it AC or DC?
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Post Mon Jan 02, 2006 3:13 pm 
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Knightrous
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Hmmm is it AC or DC?


Both. Looks like a very interesting motor.
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Post Mon Jan 02, 2006 3:39 pm 
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Big AL
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give me his email and a list of who wants some Very Happy
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Post Mon Jan 02, 2006 5:23 pm 
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Valen
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two words
THIN GAP

your standard electric motor makes a magnetic circuit with the iron in the laminations between the poles anyway.
thats how they get the efficency.
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Post Tue Jan 03, 2006 9:12 am 
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DumHed
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yeah I was kinda wondering how they could double the efficiency when conventional electric motors are already 80-90% efficient.
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Post Tue Jan 03, 2006 10:28 am 
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Knightrous
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I wouldn't call it a Thin Gap. ThinGaps don't use copper wound around a laminated stator, this Gemini motor does. If you could class the Gemini like any current motors, it's more like a brushed version of a brushless motor Razz

In this animation,


you can see it's like a LRK brushless motor, except it has inner magnets as well. I wouldn't say it's going to be twice as effecient, but using the other side of the coil to produce further torque must be a bonus.

I don't think this motor is going to be like the break through of anti-gravity technology, but it's pretty nifty if you ask me and I don't think it would be that hard to make.

EDIT: http://www.geminielectricmotor.com/ is there website, nifty video on how it works is here: http://www.geminielectricmotor.com/gemini%20all%20medium.wmv


EDIT2: More links and more information here: http://www.picknowl.com.au/homepages/jpettridge/

This page seems to be the guys personal page and has more information then the actual company website.
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Post Tue Jan 03, 2006 12:31 pm 
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Totaly_Recycled
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that is very similar to an idea i had also as i always thought that useing one side of the field was a waste

Post Tue Jan 03, 2006 3:03 pm 
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Nick
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Andrew, I hope you wrote that idea down somewhere - keep it about 10 years until the Gemini is out there generating profits, then hit them with patent infringement - its the new hi-tech way to riches Laughing

This motor looks like a brushless outrunner to me as well - it might not be so much more efficient than the very best motors, but it might achieve more efficiency from cheap parts, which is just as good in a commercial sense.
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Post Tue Jan 03, 2006 3:17 pm 
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Knightrous
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I think it's a cheaper solution to Brushless motors. It's similar to the outrunners, but you also pick up that bit more torque from the inner magnets and there's no need for some big assed expensive fancy electronic controller required to work it.

I think the Gemini motor will probably become a popular motor just on the fact that it's going to be half the price of other brushless motors the same size because it doesn't need an ESC to work.
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Post Tue Jan 03, 2006 3:24 pm 
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kkeerroo
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The motor is actualy just a new type of brushless motor (brushless as in no brushes or comutators). It reminds me of the way the Lynch, E-tek and Perm motors differ from the "common" cumutive type permanent magnet motors in that they also have two sets of magnets, one above the rotor and one bellow. A better way to put it instead of saying that it will double the efficiency of the motor is to say that it will half the in-efficiency.
Clever idea though.
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Post Tue Jan 03, 2006 3:57 pm 
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Valen
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thing is people arent seeing the "magnetic circuit" that your standard motor forms.
the one magnet has 2 poles, the magnetic field from the outer magnet will flow through the steel of the casing (which is usually a specific "magnetic" steel just for the purpose) and into the back of the next magnet where it "doubles" that magnets field output.
the same happens in the coil side of things (though *not* with his motor)
the magnetic field from all the opposing coils basically "adds up".
by going with a double magnet setup you loose that circuit effect.

when i was designing the magnetics for the wheel motors i found the only real reason for the double magnet setup is to get straigter field alignmnet across the face of the magnet. This means you can opperate somewhat more efficently if your coils are small relative to your magnet
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Post Tue Jan 03, 2006 11:52 pm 
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