I understand that there are different opinions about these motor options. I haven’t tried any of the hobby king motors so I can’t say for sure about them but I have used TB’s motors and I run them very hard up a lot of long hills and they never get hot or cause my Esc’s to get hot. I just can’t help but believe that motors specifically designed for e-boards have got to be the best option. But that’s just my opinion.
Sorry, I’m up in northern California. Otherwise, I’d love to go ride and do some testing. Btw, what equipment are you using to get these readings? I’m thinking of getting some kind of meter to monitor these things.
I’m gonna try dual hub motors soon, but in the meantime, I might also try running my two 245kv motors together, staggered on one truck, or even try a dual uneven setup with a 260kv SK3 I just picked up. Just to make things even more interesting.
One more thing for when you’re out testing, can you test the effect of limiting throttle to like 80% or something? Maybe limiting your top speed to something more reasonable will allow you to use “full” throttle, and maybe yield interesting results?
And since you’re in test mode, do you happen to have different kv motors that you could test and compare?
My first Diy setup was dual hub motors with TB 12s Esc’s and 12s Lipo. I wanted to ease into it so I started at 40% power. I stayed there for a while. Top speed with the Carvons on that setting was still 20+ mph You shoul try that and see if it reduces heat. I also tried 60, 80 and finally 100% There was a substantial jump in power from 40 to 60 Not so much difference going from 60 to 80 or 80 to 100 You should try it at 40 and see. I’m not sure if that setting limits current or voltage. My guess is gonna be voltage because turning it down feels like your running lower voltage.
I only have the 2 TB 230kv motors
I’m gonna add that to my “to try” list. From your testing results so far, I’d also guess it would reduce the voltage.
I’m not no EE but from my experience what overheats the motor is the stress in terrain and/or over throttling and the energy/power has no where to go. That’s the quickest way to overheat it. Especially, when running at 12S this is more of an issue versus running at 6S.
Ex. Your board can’t move forward but you throttle too hard and drive more power to the motors but it can’t go anywhere. That power/energy has to go somewhere (supposedly?)
Maybe someone with more exp in “electronics” might know a bit more.
I had a dual 6S on 5065 280KV and man that thing was quick and didn’t overheat much if any. I’d say it’s about 70-80% up to a 12S dual setup. It just wouldn’t climb as steep of a hill as many times due to being a smaller motor it would get hot “quicker” than a 63mm motor.
The more I read about 12s vs 6s it’s almost the same and the only real difference (assuming they’re geared optimally) is on 6s unless you’re running high c batteries they will possibly suffer voltage sag as more amps are used with 6s. A lot of the attraction of high voltsge is a hold-over from when there wasn’t such high c rated batteries available. Now that there are high c batteries there’s no reason not to run 6s other than the batteries are more expensive. Hopefully I can run a 6s on 200kv and 12s on 90kv test tomorrow. The motors will likely run very similar temps but maybe the escs will run cooler or hotter. But I hear it can go either way and higher voltsge isn’t necessarily more efficient there either
Have you done a comparison ?
But as u say the real inefficiency is too much load for the motor. Too steep really…or you could say too fat
@Hummie that and/or someone goes up a hill and slows the momentum. Then your trying to start from almost a stop in the middle of the hill. That can cause a lot of load/heat too.
I’ve done a slight comparison but I didn’t notice a whole lot of difference. Although, I wasn’t testing for amp rating and more so just riding results. 6S, you just need higher KV and a dual/second motor helps.
It seems like dual drive is the way to go to limit amp draw and keep things cooler. I’m gonna have to try that too.
If your not climbing any hills though you shouldn’t need it at all. Dual motor IMO is only really needed for hills unless you want more traction.
As you say when you try to get up a hill from a standstill it’s the worst. Riding at as close to top speed is the most efficient and adding a load onto a really slow speed is the worst.
It’s been proven that different voltage systems perform just as efficiently if they’re optimized (gears and kv ) but the controllers will perform differently depending on what…bits…they have inside. I’d like to know what the vesc is best at
Even the assumption, which I had, that with a lower voltage set up you won’t get quite the kick isn’t true. As long as your batteries can take the amp draw and the esc is suited to the amp draw it’s just as good
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Do you ever run single drive?
Yeah, once in a while for testing but I like dual personally. I know some people who enjoy single though.
My single doesn’t overheat though. Unless, I try and go up too many crazy hills.
I’ve even had a friend and we were riding for about an hour and he was fine until I told him let’s burn his motor out.
That was climbing about 5-6 steep hills. I think he burned it out though because he lost momentum up a hill. He was a heavier rider and I was surprised his single motor handled what it handled lol. I was riding with my dual setup so mine doesn’t get nearly as hot.
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@torqueboards What voltage and gearing did you run on single drive? Was this on your 230kv motor? I’m gonna try dual drive soon, and dual hubs, but I really want to sort out my single drive issues first.
And that’s interesting that you burned up the motor doing this. My motor isn’t going past 110-120°F in the windings, but the esc heatsink is hitting 170-180°F+, all on about 1-2 easy miles. So, if there’s excessive resistance or amperage, it seems to be mostly confined to the esc.
Hello everyone! A topic about what is the real amp draw / current needs for a system surfaced on another topic.
It may not be exactly what this topic is about, but I thought it is related, so someone in the future reading this, might find it interesting.
So, gladly @DeathCookies made a simple template for everyone to enter their data into.
Any feedback / improvements would be great, as I think it is still possible to be changed and should be improved.
Poll for entering Amp draw data:
http://gct-hp.de/esk8/index.php
Feedback can be posted here: http://www.electric-skateboard.builders/t/custom-poll/6171
if you see ‘‘1’’ after the index.php in the link, delete that ‘‘1’’ and it should go. Link should look like this:
http://gct-hp.de/esk8/index.php
Dunno why that happens
Original discussion / idea about creating such thread started here:
Link to the poll doesn’t work for me.
EDIT: It works now.
How does Boosted do what they do with their different speed modes?
I’m new to this hobby and I’m not yet comfortable going full speed (28mph?) 20-22 is roughly where I chicken out and slow back down. I would love to be able to max my speed to let’s say 20 with a button and at the same time not fry anything
Easiest thing to do is just limit it by feel. Only throttle when you want to go faster, otherwise just coast.