Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
Heat sinks
Took my brushless controller apart to clean it and modify a few things - and i noticed that between the heatsink and the top of the fets is a rubber sheet isolating it from the heatsink? that shouldnt be right?
shouldnt the fet cases touch the heatsink directly to sink the heat ill get a pic in a while to show you what i mean.
and on the same subject i got onto thinking - would it be better to replace the finned style heatsink with a solid piece of aluminium of the same dimensions? i mean its not like the fins can dissippate much in 3 minutes in an enclosed heater (aka robot) so would it be better to just have as much thermal mass as possible in it? _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Fri Nov 21, 2008 12:24 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
The rubber mat would be there if the FETs had an electrically active heatsink tab. If the ESC is using the common plastic mini package then the mat is probably just there for insurance - if something conductive got in there, it could short FET leads to the HS and cause mayhem. I'd check the FET cases and take the mat out if they are not conductive.
The HS is probably finned for lighter weight in a model plane. A bigger thermal mass would be better until it was all heated up to a critical temp. A finned HS and air flow is the best bet if you can manage it.
Fri Nov 21, 2008 2:25 pm
dyrodium Experienced Roboteer
Joined: 24 Aug 2004
Posts: 6476
Location: Sydney
Fit a fan to it like with the cyclone glen!
It could well be thermal conductive foam too.
I must say I noticed it with my esc. No one's exploded a sentilon yet, so don't worry too much. _________________ ( •_•)
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
yeah my concern has always been that the heatsink never heated up on mine when the motor would get seriously hot so just not thinking the heatsink was being conducted to thermally but ill just leave it then if the rubber stuff is heat conductive _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Fri Nov 21, 2008 3:42 pm
DumHed Experienced Roboteer
Joined: 29 Jun 2004
Posts: 1219
Location: Sydney
yeah it'll be a thermally conductive mat.
They work pretty well, and are much easier than using thermal paste _________________ The Engine Whisperer
- fixer of things
Fri Nov 21, 2008 5:24 pm
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