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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