Discussions

Power dstribution

Posted by Christian D. Sabroe on May 29, 2013 at 12:58pm

Hi all

I’m construction a hexacopter with 6x50amp motors (D3548).

I haven’t succeeded in finding a power distribution board which can stand this amount of amp’s.

Q: Can I connect all six motors in one parallel circuit? Or should I divide them into two circuits to two separate batteries?

Thanks

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Replies

  • Euan Ramsay May 30, 2013 at 1:04am

    Gryphon do some awesome PDB's.

    http://www.gryphon-mall.com/product.php?id_product=92

     

    Rated at 260A continuous and 320A peak; this will probably fit within your model of 6x50 (300A) peak. Afterall, it's unlikely you'd be running at a constant 300A...? I'd have thought 200A constant draw would be more likely in normal flight (where you rarely use full stick on the throttle).

  • R. D. Starwalt May 29, 2013 at 6:53pm

    I think splitting your ESCs into two separate battery systems is a bad idea. Go the parallel route.

    If it is only a DC buss you need, fabricate two bars of aluminum approximately 10 mm square, one the positive, the other the negative. You probably would be fine to adapt electric earthing/grounding bar like the one below...

    220px-Busbars_for_earthing.JPG

    You will have to use an appropriately rated crimp lug on the +/- leads of the ESC or a good tinning of solder and insert into the buss holes (not my preferred method) and tighten the supplied screw onto the wire. If you go with a grounding bar, make sure it is rated for CuAl.

    After connection you should insulate the buss bar or you could use the supplied holes to screw the bar onto an insulating material. The voltage will be low so a spacing of 2 or 3 cm would be fine.

    Just an idea.

    -=Doug

  • Søren Kuula May 29, 2013 at 4:43pm
    Hi, if it were me I would connect then all together. 300 A max. sounds like something for several batteries in parallel.
    I would solder distributor spiders of cables (4 sq mm or maybe more) without using any boards. High current wiring is done in many ways (look around) but outside amateur drones, using big wires directly on boards, or using boards at all, is not common.
    U can also arrange it as 2 circuits of 1 batt and 3 ESCs each. I would is that case still have some wires connecting + and - between the 2. These wires normally carry little or no current.
    With batteries in parallel you MUST compare the 2 batteries' voltages before you connect them, every time. More than 50mV or so of difference can cause undesired high currents charging one batt off the other.
    Regards, Soren
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