BLDC eddy current loss

[sonni]

Hello, i am new to this community. My name is sonni and i am a electric longboard builder from germany.

A mate and i discussed if their is a eddy current loss ,when we screw a metrical 3 mm bolt (10mm long) into the stator and statorcarrier of a 6354 brushless outrunner motor(diameter 63mm, 54mm long).
The screw is next to glueing our only chance to fix the stator on the carrier. I realy dont like glueing

By the way we dont know if it is a big disadvantage when the isolation of the inner bore, from the stator to the statorcarrier is removed?

I experienced som heat dissapation of my diy hub motor. I have never thought about the eddy current in this case but perhabs a isolated stator could solve my problem?


Has anybody some thoughts for me? I am no motor spezialist and thankfull for every answer.

Greetz Sonni

 

[amberwolf]

If you put anything thru the layers of a stator's laminations that shorts them to each other, it's going to keep them from working as designed, and probably cause heat. I don't know how bad the problem would be.

Miles (others too) has posted quite a bit of info over the years on how this kind of stuff works, but you'd have to poke around the forums to find it.

 

[athlon]

lamination works because they are insuladet , if you put a screw shorting the lamination together there wil be a huge drop in efficiency and the motor will have a localized overheating.

Also drilling a hole will interfere with the magnetic flux and some other parts of the lamination will saturate ( this it happends only if you drilled a hole in a high flux zone of the lamination , )

 

[sonni]

Thanks for your replies.
I have recognized that most of the stators are not isolated at the inner bore, where it is supported by the statorcarrier. Is the glue in between enough isolation?

Greetz sonni