interesting. I had wondered if this concern of noise was worth worrying about.
Did this sheilding work?
are your can cables twisted pair? long? my understanding (shallow) is they are differentially encoded and like twisted pair to reduced noise concerns.
Glad youāre thinking about noise issues, EMI problems are super annoying to debug (especially since they usually only appear when youāre pumping lots of power out of a boardā¦ not really when you want the board to exhibit weird control issues!)
I recommend using twisted stranded pair(TSP) shielded wire. Use a wire that has a drain wire and ground it on one or both sides of the CAN bus (not grounding the shield will make it basically useless). Probably overkill, but doesnāt hurt. Gauge doesnāt matter, <24awg is fine.
Yup, exactly. This is one of the main benefit of the CAN protocol is that itās built to use CAN L and CAN H as differential signals, so they arenāt (appreciably) affected by noise when transmitted through twisted stranded pair wire.
Ideally CAN uses 120 Ohm, impedance controled cable to further control signal quality, but thatās expensive and entirely overkill for the bus speed, information, and run lengths for vesc esk8ās
They were v5ās yesā¦ admittedly it was only long track it was a noticeable issue. Looking though my old logs the motors were running 90+C @10.5kw 16s in 4wd config. I know @JeffyJ has similar or worse issues with 205kv. Iām yet to see the max 4 motors or escs north of 55c running 20kw peaks.
yes, the shielding did work. i had no issues after. the can cables were very long, probably around 50in and no they werenāt twisted.
edit: i also ran them beside a battery lead for the length of the enclosure once i shielded the can cable and had no issues
i also grounded the shielding.
There is something missing, because in reality that max 4 motor with max 4 esc run double the power (log confirmed) that a reacher and vesc combo of the same count does, and they do it much much cooler. My 10kw reacher setup could cook a chicken and thatās v6 6495. Passive cooling is obviously better with an inrunner but that wonāt be it.
I pushing 300 amps to the 56118s on 12s they handle it just fine. Honestly will go up to 350 - 400 if I feel like power is lackluster.
No need for that low kv. Just gear for it. At Tef1 I was using 11/78 ratio but still hitting 68mph with more to go on the 70125s at 16s. Benefits of inrunners is super high torque and speed. I am convinced they are the future of vesc.
Sure, but not the low end torque. And itās not output power that causes heat.
Whatās missing is that the hobbywing ESC pushes that high amperage at higher duty cycles, whereas with most VESCs we are running Liion and more conservative battery amperage limits.
And the heating issues we are seeing on reachers is I am pretty sure still mostly iron losses. Especially so long track. They accumulate over the straights and donāt cool off as easily as inrunners. And inrunners probably have lower iron losses to begin with as the max4 is only a 4 pole motor not 14ā¦ That said you can run reachers with 100C cutoff start 115C cutoff end, so you have extra temperature headroom to play with also. Not sure how hot you can get hobbywings.
A new Tronic should be able to push 300A battery, maybe even a bit more, so should be able to offer at least comparable performance to a max4 ESC.
In a couple months I should have a 20S5P tabless pack for my 4WD reacher build (85+95) so Iāll be testing the reachers at high power. Aiming for around 22kW peak - about 15-16kW in the rear and 6-7 in the front. Will be interesting to see but I am expecting them to handle it just fine. Iām not going to be running more phase amps then now, there wouldnāt even be a point.
Might I be able try your Board? I wanna Try @tuckjohn 's board too if Possible at a Intro sesh sometime? because that seems like the two different outcomes of my board revision.
I really Like how reacher motors feel but I want to stay competitive & would like to not be left in the dust as far as keeping my board up to date and fast. if learning how to ride with in-runners is the way to go im all for it.
For sure! Iām currently on the 56118s on 12s right now to be lightweight for Esk8con but would be happy to have you try. Hopefully I can resolve my senor issues by then too 
Iāll be at next garage sesh if you wanna pop in or just come
Sounds Great! Id Be ecstatic to Try it! no rush though I donāt need to ride it immediately. Inrunners Scare the Hell out of me.
What would your theoretical top speed be? And was that on 6"?
The motors are definitely better but I think you definitely need to make a large step in ESC cost and size to be able to run them properly. And run minimum size gear on the motor with a gear nearly as big as the tire itself on the wheelā¦ Which is giving up performance probably if you want to try something over 6" unless you get custom spurs.
I think itās the next step for sure, but the prices need to come down or we need to get even crazier for them to be āneededā. Reachers donāt really leave headroom but perform well enough already for much cheaper once accounted for the ESCs.
dude WTF insane
Thatās total power so its like 7.5-8 kw per motor. The plan is to run 100A batt per motor in the rear, which is the max I can do on D100S and 50A batt per motor in the front. We will see how it goes but shouldnāt really cause issues.
Little worried about the regen sag at the same amps though even on the best cells so Iām dropping down to 20S from 21
Come out to i2s Tuesday at the great park
4x 6484 reacher motors is more power then youāre ever going to need. 95% of the time Iām traction and talent limited.
Iād probably bump up the rear to 95s just to gain a bit more headroom with temps but agreed. Tbh just move your current motors to the front and buy 95s for the rear is what I would do in your case @CHADFARTHOUSE
Iāve pulled 296.7A battery at 56.5v.
oooo What time? Im not Seeing a Flyer on IG or Facebook
do you Think a 20s6P,7P,or 8P is best for that?
(P45B)