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PCB Oz rating and A capacity?

Posted: Tue Nov 16, 2010 3:37 pm
by bob332

i build and fly multi-rotor radio controlled copters. currently have been flying the 4 rotor versions and when building a power distribution pcb, a friend and i came up w/ a design and we milled it out. total size is less than 2" x 2" w/ trace cutouts as we are just using 1 side of a 2oz pcb. nobody can give me a max amount of A for the traces and i am wondering if there is a formula to figure out what the pcb trace can handle w/out an additional Cu wire soldered onto the traces. i have attached a pic of the current power distribution board, not fully finished, just has the connectors that go to the electronic speed controls which feed the motors. i need to solder on the main power feed that will connect to a battery that is 12.6V max and can burst upto ~50A. for size reference, the distance between the traces is .060 (1/16")

a friend of mine is currently flying this same board w/ no beefing of the traces and is pulling at least 20-30A if not more w/ no issues, but we don't want to burn through a trace because these quads don't glide, they just drop and weighing 2#s or so, don't want that to happen.



Re: PCB Oz rating and A capacity?

Posted: Tue Nov 16, 2010 5:09 pm
by CeaSaR
Put "PCB Trace Width" in the search box next to the Servo Magazine logo above and
click on the post of the same name. You'll find the answers there.