That’s actually how I’ve got the caps arranged now.
I haven’t talked about this much since I don’t wanna just keep posting renders and adding to meaningless hype. I’ll tell more about it once I’ve got a working unit on hand.
That’s actually how I’ve got the caps arranged now.
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Beautiful! And there is no meanignless hype. The more the better! I am also looking forward in your new FOCer and hope i can use it for my future E-Bike project instead of the Phaserunner from ebikes.ca..
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yeahy last time that didn’t go well *cough * Jeff *cough *
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Speak for yourself I’ve got some 3 shunt focboxes 
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Been working on this revision. I decided to change the layout in favor of higher reliability for the gate driver and MOSFETs. The dimensions are 72mm x 84mm x 25mm(ish). This is overall a 16% smaller footprint than the previous revision with the caps mounted horizontally.
I just field tested this on my ebike at 70A 72V(20s). Ran great after dialing it in (upped the time constant and used motor sat compensation).
I tried to implement an NRF module but I messed up which pins on the MCU can be used for another UART’s TX and RX. Turns out it’s not arbitrary (I didn’t read the datasheet like I’m apposed to…) Will be seeking to fix it so an NRF module can at least be an option. The goal is to also allow the caps and/or connectors to be soldered on the opposite side if needed. Would be an option available for bulk orders.
pics with heatsink to follow…
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Beefy heatsink. The idea is that a top cap can be designed to fit over the top side. 3D printer, injection molded, or even cast aluminum for even more cooling.
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Looking good, how we doing on a beta run? I’d love to get in if there’s any spots available…just about to build a couple of new batteries endless possibilities 
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Can’t wait
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That’s a beauty
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Someone posted this up the other day, not sure which thread but hope it wasn’t this one! This sink is 10mm tall stock.
https://www.amazon.com/dp/B07V7WQVB1/ref=cm_sw_r_cp_apa_i_gcKaFbECH3G5A
Sharing a single piece of heatsink(we dual ESC 97% of the time here) is more efficient than two separate ones afaik, maybe there’s a better heatsink out there but this is close unless there are FETs right up to the edge of the 84mm dimension.
It would help for the vertically challenged.
EDIT: I see the capacitors(Samxon 220uF which is 21mm long) make it no difference to go to a shorter heatsink. Maybe there is a shorter cap option in order to fulfill that remit? Something about 15mm-16mm tall, with a 10mm heatsink and 5mm(?) standoffs total height above pcb could reduce by 5mm.
And since there is components on the underside of the pcb, maybe there is real estate to have smaller Aluminum Electrolytic caps on the underside to equal up to a single Samxon 220uF.
So even shorter again on the flip-side, like so 12.5mm (could be ignorant here I’m no EE don’t punch me too hard)
https://eu.mouser.com/ProductDetail/Nichicon/URY2A101MHD1TO?qs=OZVHsXXMeBVVm7yKMl77cg%3D%3D
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nope found it on teh flux thread, but probably you predated that considerably
Is that a flipsky dual taken with a flipsky camera?
grainy AF
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DIY flipsky dual it’s 2 X FS 6.6 I repaired there is a 20mm copper shim and heat transfer pads under the fets. Bad photos are my specialty.
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I don’t want to reduce the amount of capacitance. I could possibly look at the option having the Caps horizontally like the previous revision but that will tack on 20mm of length. This would allow for a slimmer heat sink. What do you think is the more important dimension here to optimize? Length or girth? (giggity)
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The general consensus is one half a dozen of the other but the one thing that gets em riled up is too much height and too much length (or width!). For this reason dual ESC is favoured since that is the most used platform, hence the huge popularity of Unity.
So what we see here is 25mm-ish or more with additional cooling. The caps on their side would work and most do it that way, footprint notwithstanding.
A custom CNC’d heatsink is another way to offset height and this is what the other guys do typically, of course this ends up costing the consumer more nut yeah height would be the major concern. In saying that eFoil, eBike etc typically need one ESC and care little about that.
If you care about high voltage market adoption by esk8 it can’t be ignored in which case you need to research the high-amp VESC6 product range by these vendors (maybe include ZESC & Maytech as well)
In fact this may be a better approach we see little of the ESCs linked here or high voltage at all due to size & the horrible freaking cost.
In order to get a better idea of what the market demands some competitor analysis is required, so if we can exclude tiny stuff and anything built on top of VESC4 standards which is not the market for this offering (Cheap FOCer already takes care of that) then the competitors are
Flipsky (
)
FSESC75200 75V High Current 200A ESC Base On Vesc For E-Foil Fighting Robot Surfboard AGV Robot Arm
Size:100mmx61mmx30mm
Maker-X
GO-FOC HI200/HI100 75V 200A
Size: 112*73*36 （Including heat sink
LaCroix (in beta)
Stormcore 100D
126X70X24mm
Of course everybody is creaming themselves with the wish for a 100D, the 100S is essentially half of that or not much larger than a focbox OG
Trampa
VESC 75V 300A
141mm Length 82mm Width 18mm Height
VESC 100V 250A
141mm Length 82mm Width 18mm Height
?Insert forgotten vendor here?
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Thanks for the comparisons here!
Seems about 25mm of height is about right. One key property I’m trying to hit still is cost. This isn’t meant to be the smallest, or most powerful, or highest end controller. It’s meant to be the best bang for your buck while still fitting the bill for typical power needs.
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Hey Lucas, great work as always!
Have you come up with a price point for these yet? Would be sick to have a 15S funwheel.
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I have a target price but it all boils down to what it costs me to make these. I’m trying to with hold from any guesstimates until I have pricing for services like assembly, kitting, and shipping.
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This is exactly what’s in my mind while reading this thread
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Future Motion who? lol
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