More 540C-7XL inside pics
 

Just a few more pics inside... thats one compressed coil!

Strange, even the Feigao incorporates a segmented rotor, too....hmmm.

BTW, zeropointbug, if you want to add more pics, you dont need to open up a new thread. Just click "post reply" and then choose " manage attachement".

I would think that segmented rotors would be less expensive, maybe?

Pretty dang simple though! Hmmm, why are they still more expensive than brushed motors? They are mass produced enough that you'd think they could bring the price down even further.

Actually most segmented motors are the Highend ones, which cost lots of money.

hmmm, that is interesting. ;)

That's not very many segments for a segmented rotor. The lehners have 10 or more.

Really, 10, are you sure? Maybe the magnets are typically of the higher grade then the smaller ones. Like N48 grade, i think are the highest grade for 80' C currie temperature. Then there magnet grading in the 100, 120, 150, 180, and 200 C range. Those are the high end ones, i would think they are using 150, prob 180C temp magnets?

I saw a picture of a lehner rotor. I didn't get an exact count, but there were a lot of segments each less than 1/8 inch thick.

Really, hmmm, i wonder what the benefit is going that way. Maybe it gives more consistent magnetic field? I think they have 6 poles total, if i'm not mistaken?

The use of a segmented system reduces magnetic flux "eddy" currents, which are losses. Instead of having large eddy currents in a solid core, you have a bunch of much smaller ones, which apparently is better. Which is the same reason pwer transformers use many plates instead of a solid core. This page explains it.

Using segmented system may also have something to do with reducing hysteresis, but not quite sure on that. It's been a LOONG time since I was in shcool studying magnetic theory.

From my understanding, having more segments would create better efficiency and less resistance with better flow of "eddy" currents. the more segments that are used, the better the conductivity creating less loss? Did I understand that right?

Using three thick slices doesn't make it a 'segmented magnet' The feigao's use this as following;

1 core for the s
2 cores for the L
3 cores for the XL

BrianG, right, i don't know why i didn't think of that! Duuuh ;) Honeywell has magnetic core that has 10,000's of laminates, then with ton's of force it's squeezed to together with resin. They are suppossed to have super low losses, if you put a NIB magnet inside them, you can't even attract a small nail to stay on it...

Serum, that's what i was think for the Feigao motors...

The 'normal' 7XL uses the same compressed coils bytheway..

Serum, ya i know. Do you know if the Hacker do the same? THey must, they are pretty much identical...

Does anyone have any thoughts on the Hacker compared to the Nemesis motors? Hacker pretty much started the brushless car market (not intentionally)

I think the hackers use segmented magnets.

I just found this pic on the net of a C50 which was opened..

http://www.runryder.com/fastphoto/32193/IMG_0922.jpg

lol, the link takes you to a little logo...

I don't know what you are seeing, but i tried it from another IP address and was able to see the picture..

does that rotor fit in a feigao/wanderer motor?

what the bleep, why is it so greasy and fried looking.

...I have a cousin in Holland named Niels.... it that you?! lol

I always wonder why the cools are not straight in the middle where the rotor runs.

BTW, it looks like the 3-phase wires coming out are actually all the wires from the motor just bundled up and then strung out and soldered together...

Can anyone confirm this?

Having a can that is a finned heat sink is a very nice option it seams like it would transfer heat much more efficiently than an add on heat sink. Even with artic silver a bolt or clip on heat sink wouldn't transfer the heat as well. It would be interesting to see a comparison of the two to see how much of a difference it is.:032:

Yes Zero, it are all the wires from the coils.


The reason it looks so bad, is because these come from a fried C50

Serum, ah, icic

smhertzog, yes, an integrated heatsink in the motor can would transfer heat much better, it's quite thin, there is probably 4 times more surface area than a smooth can version; PLUS the heatsink IS the can, so its the entire circumference of the can. Im sure it will run up to 20 degrees F cooler than a bare can.

One thing i don't like about the 540C-xxx motors is the mounting screw holes which are two beside each other on each side of the shaft, whereas the smooth can motors have 1 hole every 90 degrees from the next. This doesn't leave to much for mounting options... or maybe i could just make a mount for it and than make the mount adjustable instead? (for changing pinions)

there is a slight design flaw in feigoas integrated heatsink design that limits it usefulness somewhat.
On the 380c motors there are fins but nowhere for the air to escape or flow thus it would create an air pocket in-between these fins.
The bottom line is they tried to emulate the c40 and kontronik twist motors using and extruded section with fins for the casing but in the end this means the arrangement of the fins is inferior to that of the c40 and twist motors

Yah, the 380 size motors the fins are circumventing around the can, the 540C cans the fins are length-wise so if it up in the path of air flow, it will be kept quite a bit cooler that the smooth can versions.

I think? Is that true for the 380 motors?