So technically speaking there are three reasons why you give max V for motor:
@b264 is right, insulation on wiring etc does matter - and there are some very thinly insulated winding wires that will start causing problems at low voltages (~50V) if you provide enough of moisture to stator (moisture will get into cracks that are created during winding process)
common method with electric motors is to create something called “excitation pulses” to create Eddy current in stator (or rotor depends on which configuration you use) during nearest magnet position to amplify the main field flux on work phase of magnet pass - specifically useful technique on permanent magnet machines to achieve a very high low rpm torque. When you use excitation pulses, since those are square wave of very short duration, these generally create very little current in coils (compared to drive current) so you can use very high voltages for that.
Some motors use built in diodes to provide multipole configuration from less driving phases (switch reluctant motors are prime example) and here max voltage would be a diode max reverse voltage.
I know that this questions might seem over the top for some - I just wanted to know max rating for a motor.
In Carvons case Some of that has to do with the eprm limit in the vesc and can cause a DRV failure
Moving up in voltage won’t kill the motor
It will make the motor hit that limit and what use is that to anyone
So from what I understand would need a lower kv motor than what is used now to offset a higher voltage or a vesc with a higher limit
At the beginning I definitely will use vesc as learning curve for RWD, but going for AWD will require 240A out of battery pack, which makes:
cabling cumbersome
fusing strategy obscure
any bms way over-engineered
to many cells in parallel for my liking (if one cell fails you end up with rest of parallel setup dumping power into it).
It’s a third time I’ve writing this god damn reply … going from meeting to a f@#%$^@# meeting
Anyway my plan was to start with 12S graphen lipo for power stability and grow from there. So in the future I might go for higher voltage pack - but that will cause need for different esc. So I want to future proof the setup, and since those motors seem to have a more beefy shafts (no innuendo here) - it looks like a reasonable investment.
I’m with you on most of above, but changing over to graphene only solves the “too many cells” problem? Maybe fusing if you were thinking cell-level. Ar cables if you’re building a flexy setup.
Oh and if this is your first ride, I’ve found that even overbuilt, on e-boards things wear out and fail with alarming speed. I’m pretty sure it’s not just me (NYC commuter). It’s not often brought up directly, but everyone seems to have a pile of broken parts.
The v3/v4 design looks to address many many issues (beefy shafts lol), but, speaking from experience, I wouldn’t count on any e-board lasting forever.
True, but:
when I go for 65C graphens that theoretically can deplete them self in 55.3 seconds, then I will not get problems with cell temperatures, heat accumulation, issues with regen breaking peaking out voltages and them me trying to “run it out”.
about beefy shafts … sorry, but I was struggling for better term at that time, but I can surely compensate this with “larger rods” or “more girthy poles” (glad is made someone chuckle at least)
back to the subject, in terms of price and stuff breaking my grampa had a saying “everything cheap i more expensive in the long run”, which kinda makes sense, if you use hangers with flimsy shafts and you drive torque through those you may lose the wheel, then loose your teeth in the process … and last time I’ve checked implants are more expensive than most expensive e-skate motors So I understand that nothing lasts forever, I just want to minimise the failure rate on vital components (hence overkill batteries and “beefy shafts”)
ps. don’t get me started on C rating yes at 90% C rating may be true but when you get close to true 20% of SOC you can take C rating and divide by 10 easily - so as I said before bms should monitor cell voltages and give current limits to all the motors in setup rather than motors sensing the main bus voltage and users ending up with oscillation.
If you check on carvon Instagram , the speed drives r and XL are all ready with Jerry the motor part that is he’s waiting on the CNC’D trucks to come only thing that’s holding him back ,after they arrive still have to assemble them, 1-2 months to go before they start shipping them out
Just getting into esk8… looks like i just missed the hottest motor out there. ah well. Im going to ride something cheap and chinese in the meantime. I’ll catch the next wave.
From my (very recent!) research it looked that way. I think the direct drive concept is the engineering solution of the future. Seems like it would retain the best qualities of both outboards and in-wheel hubs. Im a big guy, but i live in houston where it is flat, so no crazy torque is really necessary so i was leaning towards hubs, but they all seem a little weak. Anyway, i bought a kickstarter board, ionboard x, to be able to skate around with my nephews since they also have boards until i build something. Its supposed to essentially be an improved meepo. Supposed to have 9 ply board. 2 x 500w hubs and 350Wh battery. The price was right… ill probably post a review when it arrives.
(glad is made someone chuckle at least)
So I understand that nothing lasts forever, I just want to minimise the failure rate on vital components (hence overkill batteries and “beefy shafts”)
