Quote:
Originally Posted by jsr
Sounds like either thermal grease or thermal pad (not sure since you first mentioned a jelly like substance, then a white pad later). Direct metal to metal contact is actually a poor method of heat transfer as neither surface is truly flat enough to conduct heat efficiently as air is a poor heat conductor. A thermal layer is usually used to account for the lack of actual contact between surfaces. Not sure how far the heatspreaders and heatsink are. How can you tell they're far apart? Because of how much jelly there is when you pull them apart? You also have to consider the environment the part will be used in. Perhaps they wanted some space as an impact from the top would translate directly to a compression of the PCA beneath if they were in direct (or near direct) contact, which may happen in an RC application (i.e. if the car/truck flips over with no lid).
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The heatsink is about 2mm away from the heatspreaders and in between is a layer of white pad that is made of some material that feels like hardened jelly.
I will try to take a picture of it when i get the chance to take apart the esc.
Right now it is in my e-savage.