Re: Kostov rpm Limit

[Royce Chow <rufus@infosite.com>]

> Any suitable dielectric that can sustain the mechanical strain as not absorb
> moisture that would reduce its insulating capacity and can withstand the
> potentially high temperatures.  A .010 thickness of Mylar with a split sleeve
> of G-10 (Printed circuit board material) is a reasonable combination.  The
> Mylar will offset any moisture absorbed by the G-10 and the G-10 will absorb
> the mechanical force of the piano wire.  I'm sure Lee can recommend other more
> suitable and perhaps more exotic material that would be more suitable.
>  A preheated stainless steel ring pressed and shrink fitted with the proper
> insulation would be far less cumbersome than wire wrap.  I don't have my
> "bible" handy, however I believe the coefficient of expansion of copper is
> greater than that of steel, therefore it would become tighter on temperature
> rise which is a desirable goal.  I suspect a pressed on Kevlar sleeve may also
> do the trick.  I don't know the dielectric factor of Kevlar, but it may not be
> very good as its composition included carbon, therefore any insular would
> still
> be required.  
> 
> Best regards,
> 
> Leon
> 


Wow, this is cool! I had no idea this sort of thing could be done, and I had
never seen it mentioned before now on the list (although I've only been on
for like 6 months). Anyone out there know any other trick motor mods? :)

Royce Chow  KF6PEO
rufus@infosite.com