Endless Sphere

Thought about doing the same with my kona stinky. A bit overpowered, that front wheel will like to fly

:es: It’s a really good name. A bit mystic, environmental, makes you curious. I know that us scandinavians are generally better than americans at english but i never found the name hard :mrgreen: My point is: It won’t be easy to find a better name that doesn’t leave a sour taste in comparison. Don’t...

forum wasn't sold to the highest bidder. The moderators of the forum were already trying to sell it to someone else without asking or informing me, for about $5k from what I remember. So someone that was involved with that secret sale came directly to me to ask if I knew about it. I didn't have tim...

How can you tell, rotor surface area? Same max rpms given from QS for both motors Power proportional to rpms*torque -> only torque diff needs to be found Torque proportional to airgap surface * lever given same flux and materials -> (Pi*180*90*(180/2))/(pi*138*70*(138/2))=2.2 But a lot of assumptio...

That 75-7 & sevcon combination is nice, 50kW
Truly expensive stuff though.

If the apt961000 would be known here, combined with QS138 90H or one of the unobtainable larger QS mid motors.. if i’d been looking for a new build then i’d try that.

Correct, seems that MTPA was introduced in VESC:
https://hackaday.io/project/164932-axio ... -into-vesc
Then i guess next step is to get an axiom

It’s not a standard interface. best bet is to grind it down and just bolt the sprocket you want to the outside of the mount. Could be done with simple tools.

j bjork wrote: ↑

Jan 07 2021 6:46am

@j bjork: wonder if the bac8000 might do look-up table field weakening. haven't seen any program screens here on ES yet.. might be worth checking

VESC guys seems to be working on mtpa https://github.com/vedderb/bldc/pull/91

True, every thread derails after five pages or so. If you don’t have control of the motor then you’re not close, the other parts are easy and could be disregarded if you don’t get them to work. Seems there is at least some new data on the new controllers in the thread now, the old data probably won’...

I don’t find square wires to be that difficult but it’s true they cannot be wound as quickly as a softer/lower diameter multiwire wind. The thicker wires have the benefit of being bulletproof in comparison to the super thin wires on many chinese rc motors. Anything less than a true 30% is a poor win...

That’s the problem, me neither. The program started out following the manual back when i got my first votol but now it’s not even following the text on the setting screens. Users don’t know which revision of this they got.. it’s a total mayhem.

@amberwolf:You should read the Votol thread This controller currently seems to have undergone an update that rendered the program incomprehensible. Any users with Votol issues should be directed to https://endless-sphere.com/forums/viewtopic.php?f=7&t=95969. I recommend to stay away from the Vot...

I’ve done some square wire winds, it’s really dependent on the way you shape the wire. This is a 60% winding. F5428A80-C891-4365-9FAF-5BCA42ABB9B2.jpeg From there it’s hard to get a large increase in fill whatever method is used. 90% or whatever is mentioned in the paper won’t ever be wound on a mot...

The fets are rated at 150V, most likely the caps also.
This doesn’t mean it’s safe for 150V, used voltage needs to be lowered/derated to cover voltage spikes.

It’s a grey scale, probably a bit over 120V works and 140V don’t.

It’s weird, i am hoping for about these rpms with 120V
I guess the votols were improved a bit since my early edition. What’s your noload current at 7500rpm?

2V out of 80V is 2.5%
Will you even notice a difference?

Drupa wrote: ↑

Dec 29 2020 4:29am

Does anyone know how to get the excel file of the Port Configuration Setting?
I cant reach that link from any download soure

You won’t need it to get this fixed.. but you can ask QS for it. Judy@tzquanshun.com
Please upload it if you get it.

you'll find that those extra wires don't give a large increase in fill if it's not a (really) crappy motor winding. The other thing is that the windings closest to the magnets are more affected by eddy losses. I’ve seen some tests where it wasn't worth it to pack the final layer closest to the slot ...

@drupa: you should ask j bjork or bartosh to check this thread and measure their Votol hall voltages. I don’t have access to a votol currently. 3V just seems to low to get good function. You can see what noisy hall signals look like here: https://endless-sphere.com/forums/viewtopic.php?f=30&t=87...

Looking forward to seeing your results with this mod

”Hall error” in a Votol means your throttle signal is outside of voltage limits. It’s stupid that it’s called hall error since there are potentiometer throttles out there also, Votol should switch to ”throttle error” Check voltage settings for the throttle and throttle connections to fix this issue.

Time to change that five
I also wonder if your hall connection and setting is ok. Only way to know is to do the trials.

You can use the google translate app to scan the pic and translate.

Current capability is defined by how many cells in parallell, not in series.

There’s no clear answer on continuous and peak for different bms’s, all sellers define it / exaggerate by different amounts

No, you lose a bit of efficiency but it doesn’t matter

Just don’t overpower and burn your motor (which you can do with any controller type.)

Judging by the pic it seems that motor is 8pole / 4 pole pair, you wrote 5 pole pair above? What is controller setting? Some hall checks: -How is hall pcb fastened? Can it move at all? (lock it!) -Are halls aligned equally close to the magnets?(should be) -You can try to lift hall cable away from co...