Roman - I distinctly remember what I believe to
be Mica insulators (best described appearance-wise
as simply 'clear and glistening' ) used in such common
household products as toaters ... Have you seen that
as well?

Jim

----- Original Message -----
From: "Jim" <jvpoll@dallas.net>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, August 29, 2001 7:59 AM
Subject: Re: [OT]: How to heatsink a lot of power electronics?


> Roman:
>       "... and a lot of DC motors used mica
>       as the main insulator between the copper
>       commutator segments on the armature."
>
> Now that you mention it, I *do* recall seeing Mica
> used in applications like that on DC motors.
>
> Jim
>
> ----- Original Message -----
> From: "Roman Black" <fastvid@EZY.NET.AU>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Wednesday, August 29, 2001 1:13 AM
> Subject: Re: [OT]: How to heatsink a lot of power electronics?
>
>
> > Jim wrote:
> > >
> > > Dan:
> > >      "Mica is somewhat flimsy in the robustness
> > >       category. I wonder whether it will flake
> > >       apart under the constant vibration from the
> > >       motor."
> > >
> > > How would this ocurr if the insulator is coated
> > > in HS compound/thermal grease and securely
> > > held between the heatsink and transistor body?
> > >
> > > I have *never* seen a Mica insulator 'flake' apart
> > > in use -
> >
> > I agree Jim, and a lot of DC motors used mica as
> > the main insulator between the copper commutator
> > segments on the armature. :o)
> > -Roman
> >
>
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