DIY motor from a motorcycle magneto stator?

[erajomppa]

I'v been reading a lot of diy articles, posts and instructables for the past few weeks and I am intrigued by the idea of making my own BLDC motor, one that would have that sweet low kv and lots of torque so I could easily use it to make a powerful (small, but >1kW) EV.

Gobrushless have their 53mm stator (http://www.gobrushless.com/shop/index.php?app=ccp0&ns=prodshow&ref=53-35-12), but thats a bit pricey for a cheapskate like me.

So how about these: http://www.aliexpress.com/item/12-p...2313043965.html?spm=2114.01010208.3.35.4ZTdxQ

12 poles, outer diameter 88mm. The stator poles are not too big, they would need to be rewired (I think?) and they might need some special arrangements to get them attached to a shaft. Is this a silly idea? I think it might have potential, but as far as I know there might be a fundamental error in this whole idea?

another link that shows the outer diameter:
http://www.aliexpress.com/item/Moto...998728868.html?spm=2114.01010208.3.121.4ZTdxQ

 

[SolarRay]

The plate is too thick (0.7mm).
Very large iron loss.
http://electrotransport.ru/ussr/index.php?topic=36552.0;topicseen

 

[erajomppa]

Oh, okay. Nice find on the thread, I read some of it through (google translate). So even 0.7mm plate is too thick huh? 0.35 is 2-4 times better, at least according to them. What is the plate thickness of a standard BLDC motor stator?

I just looked at gobrushless stator and they proclaim 2mm thickness on a single stackable plate? http://www.gobrushless.com/shop/index.php?app=ccp0&ns=prodshow&ref=S-250-22-12
Is it that they already might have few layers of plates and they are just sold in 2mm packages?

 

[erajomppa]

Okay this is their 4mm thick 18mm stator, in the picture you can clearly see that there is multiple layers of plates inside it

So yeah, kinda answered that quickly myself.

EDIT: counted 11 layers. 4mm/11 = ~0.36mm (though gotta count some for the enamel layers)