Search found 1961 matches

by larsb
Jan 12 2021 2:41am
Forum: E-Bike Non-hub Motor Drives
Topic: QS 3000 138 motor bike installation generalized
Replies: 6
Views: 293

Re: QS 3000 138 motor bike installation generalized

Thought about doing the same with my kona stinky. A bit overpowered, that front wheel will like to fly :thumb:
by larsb
Jan 12 2021 1:27am
Forum: General Discussion
Topic: Is this the same KnightMB that sold us out?
Replies: 188
Views: 32409

Re: Is this the same KnightMB that sold us out?

: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...
by larsb
Jan 11 2021 2:40pm
Forum: General Discussion
Topic: Is this the same KnightMB that sold us out?
Replies: 188
Views: 32409

Re: Is this the same KnightMB that sold us out?

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...
by larsb
Jan 10 2021 11:56pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZF250F
Replies: 24
Views: 1037

Re: Yamaha YZ250F

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...
by larsb
Jan 10 2021 12:39pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: ME1507 vs QS motors
Replies: 13
Views: 846

Re: ME1507 vs QS motors

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.
by larsb
Jan 09 2021 5:05am
Forum: E-Scooter and Motorcycle General Discussion
Topic: ME1507 vs QS motors
Replies: 13
Views: 846

Re: ME1507 vs QS motors

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 :D
by larsb
Jan 07 2021 3:43pm
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 609
Views: 81116

Re: QS 3000w midmotor

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.
by larsb
Jan 07 2021 12:49pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: ME1507 vs QS motors
Replies: 13
Views: 846

Re: ME1507 vs QS motors

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
by larsb
Jan 07 2021 1:55am
Forum: Motor Technology
Topic: No load motor, controller testing, runaway.
Replies: 16
Views: 359

Re: No load motor, controller testing, runaway.

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’...
by larsb
Jan 06 2021 2:52am
Forum: E-Bike Technical
Topic: Maximizing Copper Fill
Replies: 7
Views: 283

Re: Maximizing Copper Fill

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...
by larsb
Jan 06 2021 2:26am
Forum: Motor Technology
Topic: No load motor, controller testing, runaway.
Replies: 16
Views: 359

Re: No load motor, controller testing, runaway.

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.
by larsb
Jan 06 2021 1:19am
Forum: Motor Technology
Topic: No load motor, controller testing, runaway.
Replies: 16
Views: 359

Re: No load motor, controller testing, runaway.

@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...
by larsb
Jan 06 2021 12:30am
Forum: E-Bike Technical
Topic: Maximizing Copper Fill
Replies: 7
Views: 283

Re: Maximizing Copper Fill

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...
by larsb
Dec 31 2020 4:37am
Forum: E-Bike Technical
Topic: Programming APT AE96600 controller (UPDATE: don't buy, unstable program)
Replies: 193
Views: 26984

Re: Programming APT AE96600 controller (UPDATE: don't buy, unstable program)

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.
by larsb
Dec 29 2020 1:56pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: KTM 200 exc goes electric
Replies: 212
Views: 25253

Re: KTM 200 exc goes electric

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?
by larsb
Dec 29 2020 11:49am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: KTM 200 exc goes electric
Replies: 212
Views: 25253

Re: KTM 200 exc goes electric

2V out of 80V is 2.5%
Will you even notice a difference?
by larsb
Dec 29 2020 11:39am
Forum: E-Vehicles General Discussion
Topic: Motor Hall Fault
Replies: 44
Views: 652

Re: Motor Hall Fault

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.
by larsb
Dec 29 2020 7:36am
Forum: E-Bike Technical
Topic: Maximizing Copper Fill
Replies: 7
Views: 283

Re: Maximizing Copper Fill

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 ...
by larsb
Dec 29 2020 2:18am
Forum: E-Vehicles General Discussion
Topic: Motor Hall Fault
Replies: 44
Views: 652

Re: Motor Hall Fault

@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...
by larsb
Dec 28 2020 9:19am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: KTM 200 exc goes electric
Replies: 212
Views: 25253

Re: KTM 200 exc goes electric

Looking forward to seeing your results with this mod :thumb:
by larsb
Dec 28 2020 8:47am
Forum: E-Vehicles General Discussion
Topic: Motor Hall Fault
Replies: 44
Views: 652

Re: Motor Hall Fault

”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.
by larsb
Dec 27 2020 1:18pm
Forum: E-Vehicles General Discussion
Topic: Motor Hall Fault
Replies: 44
Views: 652

Re: Motor Hall Fault

Time to change that five :wink:
I also wonder if your hall connection and setting is ok. Only way to know is to do the trials.
by larsb
Dec 27 2020 1:13pm
Forum: Battery Technology
Topic: BMS Amps question ?
Replies: 5
Views: 148

Re: BMS Amps question ?

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 :wink:
by larsb
Dec 26 2020 10:44am
Forum: E-Bike General Discussion
Topic: Is a sinewave controller healthier for a motor?
Replies: 4
Views: 265

Re: Is a sinewave controller healthier for a motor?

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.)
by larsb
Dec 25 2020 9:58am
Forum: E-Vehicles General Discussion
Topic: Motor Hall Fault
Replies: 44
Views: 652

Re: Motor Hall Fault

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...