On 02/28/2017 04:08 AM, EVDL Administrator via EV wrote:
On 27 Feb 2017 at 16:55, Mark Hanson via EV wrote:
Heat sink grease should be NON conductive electrically but thermally
conductive white grease.
Though I'm far from an expert (EE dropout here), this makes sense to me.
Mainly you want just a thin film of heatsink grease. It fills the voids in
the mating surfaces so heat transfers better. In my admittedly limited
experience, I don't think you usually rely on a heatsink for an electrical
connection anyway. Yes? No?
Generally, yes. There are a LOT of electrically insulating, thermally
conductive silicon pads that you can purchase to electrically isolate
components from heatsinks.
However, in the Curtis 1231c controller, the main internal heat sink is
also an electrically conductive part of a power rail. (It is isolated
from the outer case by a large Silicon pad.)
This is why I'm asking for advice, as electrically insulating thermal
compounds are easy to find, but I don't have a lot of experience with
electrically conductive ones.
When I disassembled the unit the parts had a thin film of what looked
like (yellow/clear?) grease between them and the heatsink (NOT a white
thermal paste).
Jay
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Read EVAngel's EV News at http://evdl.org/evln/
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
