Joined: 16 Oct 2004
Posts: 436
Location: roleystone perth. WA
give me his email and a list of who wants some _________________ For West ausies interested in robotics email me at: theoneshrug@hotmail.com
OR
dragoonarie@gmail.com
best quote ever:: "Those Gas-Turbine style warehouse heaters arent illegal, and neither is remote controlling one as far as I know."
Mon Jan 02, 2006 5:23 pm
Valen Experienced Roboteer
Joined: 07 Jul 2004
Posts: 4436
Location: Sydney
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. _________________ Mechanical engineers build weapons, civil engineers build targets
Tue Jan 03, 2006 9:12 am
DumHed Experienced Roboteer
Joined: 29 Jun 2004
Posts: 1219
Location: Sydney
yeah I was kinda wondering how they could double the efficiency when conventional electric motors are already 80-90% efficient. _________________ The Engine Whisperer
- fixer of things
Tue Jan 03, 2006 10:28 am
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
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
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.
This page seems to be the guys personal page and has more information then the actual company website. _________________ https://www.halfdonethings.com/
Tue Jan 03, 2006 12:31 pm
Totaly_Recycled Experienced Roboteer
Joined: 15 Jun 2004
Posts: 1346
that is very similar to an idea i had also as i always thought that useing one side of the field was a waste
Tue Jan 03, 2006 3:03 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
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
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. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Tue Jan 03, 2006 3:17 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
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. _________________ https://www.halfdonethings.com/
Tue Jan 03, 2006 3:24 pm
kkeerroo Experienced Roboteer
Joined: 17 Jun 2004
Posts: 1459
Location: Brisbane
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. _________________ Get Some!!!
Secretary of the Queensland Robotics Sports Club inc.
Tue Jan 03, 2006 3:57 pm
Valen Experienced Roboteer
Joined: 07 Jul 2004
Posts: 4436
Location: Sydney
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 _________________ Mechanical engineers build weapons, civil engineers build targets
Tue Jan 03, 2006 11:52 pm
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