200A, 14S lipos ESC to come!!!

[GriffinRU]

Originally Posted by BrianG

Is there a reason why FETs don't have an electrically insulated metal "insert" to help cool them? Adding a heatsink to the epoxy package definitely helps, but it IS plastic after all.

You do not want to do that if you plan to sink lots of Amps. Current design is great for given applications and it is much easier to deal with insulation of the tabs outside the package, while utilize FET's substrate as one connector and a heatsink at the same time.
There are 7 pin Dpak packages and direct-on Fet packages which are designed to maximize heat and current transfer.
The best way is to combine high-speed heatsinking (Copper) and low-speed (Alum), then ceramic can be utilized as long as it is very thin. And I think that is the idea behind all packages.

[rchippie]

The best way is to combine high-speed heatsinking (Copper) and low-speed (Alum), then ceramic can be utilized as long as it is very thin. And I think that is the idea behind all packages.

So when we mod the quark are we better off using a copper or aluminum heat spreader ?. And would it better to have a heat sink made from copper also ?. Thank's

[GriffinRU]

Originally Posted by rchippie

The best way is to combine high-speed heatsinking (Copper) and low-speed (Alum), then ceramic can be utilized as long as it is very thin. And I think that is the idea behind all packages.

So when we mod the quark are we better off using a copper or aluminum heat spreader ?. And would it better to have a heat sink made from copper also ?. Thank's

I am working with Mike on Brass-Copper heatsink for Quark, updates will come pretty soon :)

Originally Posted by lutach

Do you think that guy is for real with his true 150A continuous controller? What he basically said is that my controller is a 95A controller. I'll just have to wait and put out the numbers.

I haven't seen nor touched his controller, so I do not know yet.
I thought we did the estimate with you before.

[rchippie]

Originally Posted by GriffinRU

I am working with Mike on Brass-Copper heatsink for Quark, updates will come pretty soon :)





I haven't seen nor touched his controller, so I do not know yet.
I thought we did the estimate with you before.

Thank's artur for the heatsink update. Whats your opinion on the heat spreader for the quark, copper or aluminum ?. Artur how have you been ?.

[GriffinRU]

Originally Posted by rchippie

Thank's artur for the heatsink update. Whats your opinion on the heat spreader for the quark, copper or aluminum ?. Artur how have you been ?.

You welcome!
For Quark:
- use stock alum housing as external heatsink
- replace both alum internal plates with brass

Challenge:
- very tight inside
- galvanics, is it a problem? :)
- soldering...

[lutach]

I just heard from the engineer and he is having some trouble with the software. This is what he asked me: "We need to know when the brake apply. For example, to what exactly position you turn the trigger will just free the motor and to what position you turn the trigger will apply the brake." I told him that the brake has to be proportional with the trigger and it should not be applied when the throttle is at neutral. I know there is the "ms" things and I have no clue what they mean and if they could help them at all. Any inputs will be appreciated.

[MetalMan]

Originally Posted by lutach

I know there is the "ms" things and I have no clue what they mean and if they could help them at all. Any inputs will be appreciated.

My guess for "ms" is milliseconds. The transmitter sends out throttle pulses of 0-2ms long, depending upon the position of the trigger. 1ms is neutral. For airplane radios, I believe 0ms is neutral (since they don't have reverse).