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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Im looking at may motors for flight, but i see two major types, the conventional cylinder type and the pancake type.
ive seen the ARdrone which uses a 2 pole very high RPM motor, with a tiny pinion, and a large gear on the prop. So can the pancake motors capabilites be duplicated with a cylinder motor, even if it has to be custom wound?
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Wikipedia?
The last link has this interesting quote:
"This is actually an interesting motor. It is designed by somebody called Lynch in England. He never went to University and doesn't know any mathematics and stuff like that, but he taught himself electrical engineering. And it turns out the motor he made is one of the world's leading motors in terms of power and mass. Lynch developed his own kind of algebra to do that but no other academic can understand what he's doing, but he seems to know more than many academics in electrical engineering departments because this motor is of very good performance"
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
pics
im currently reading th wikis' you cite. ive seen the old 5.25 floppy drive servo motors that use two discs with teeth whose windings minimise the air gap, if thats waht your meaning
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
But do the " pancake " motors for drones mean high torque, at 22 volts and low current? We'll try turning a 26x.5 prop in VABs. Then look at the air stream.
Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
I have seen this kind of motors in 5"25 floppys effectively
If I recall well enough the wire diameter was approximately the same as the one you showed, but I guess the spatial distribution of the coils would make for an easier rewinding
this would be a bit like a helicopter powered by a motor like this one ;)
before you yell at me, the analogy is not crappy, they have the ability :
if they made it into a motorcycle, you can surely make it into a helicopter
will you fancy an internal reduction like that one?
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
PCB motors are the latest iteration. Gaps in the <0.1mm range, totally sealed like a hard disk and the magnets are a single piece of N45 with the pattern embedded in it at manufacture.
Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
hmm what about 3D printed epoxy-ferrite or similar extrudable ferromagnetic compound in the form of a motor coil form or motor lamination (all rights blah blah... ;) )? it would extend the field into the amateur domain
I'd be interested to make a small 3D printer just for that
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Im looking at pancake motors, wondering how they work.
