Search found 832 matches

by j bjork
Jan 16 2021 4:51am
Forum: Motor Technology
Topic: Kelly KBL 96251 and QS V3 273 trouble
Replies: 26
Views: 385

Re: Kelly KBL 96251 and QS V3 273 trouble

It was exactly that kind of break I mean. I dont think you will break the tubes. I might add that I dont have any experiace with that kind of problem myself, but when I built a fast bike I used a dual crown fork even though it is only rear wheel drive.. It might not break right away, but with time w...
by j bjork
Jan 16 2021 4:37am
Forum: General Discussion
Topic: Electric 450 CRF conversion.
Replies: 10
Views: 324

Re: Electric 450 CRF conversion.

Nice, very similar to my plans for the yamaha build :thumb:

Setting up the sevcon looks easy for you, it seems like it is not for most people :wink:
I am struggeling with the controller choice myself, it is hard to find a good powerful controller if not going the sevcon direction.
by j bjork
Jan 15 2021 1:20pm
Forum: Motor Technology
Topic: Kelly KBL 96251 and QS V3 273 trouble
Replies: 26
Views: 385

Re: Kelly KBL 96251 and QS V3 273 trouble

Shit, this thing looks seriously dangerous :shock: I would not want to be on it when it wheelies on full throttle, and the front wheel spins up to full speed before it hits the ground. It would be really interesting when the fork brakes when the wheel get traction again. I dont think your motors are...
by j bjork
Jan 14 2021 5:21am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

Haggan, du har pm. Soap, I will use the EV modules that you can see some of in a picture when I tried if they fit. I will probably parallel with some rc lipos or something to get some extra Ah and lower ir. The ev cells are very good, but not the most energy dense. So they make more sense on a daily...
by j bjork
Jan 13 2021 12:49pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

Thanks larsb, makes sense :thumb: So it seems like the 138 90h should be able to make about 30% more torque and power than the 130 70h, interesting. Thanks Soap_62, but I am not looking to find a motor that fits inside the housing. I want a big motor that can make big power for some time. I prefer a...
by j bjork
Jan 13 2021 3:08am
Forum: Motor Technology
Topic: Kelly KBL 96251 and QS V3 273 trouble
Replies: 26
Views: 385

Re: Kelly KBL 96251 and QS V3 273 trouble

Yes, and you will need a much beefier controller too. 250 phase amps on a 273, and you are talking about drag racing?
by j bjork
Jan 12 2021 1:03am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 77
Views: 5163

Re: True FOC: definition and examples

It may be possible sensorless in the motor, not in the controller..
by j bjork
Jan 10 2021 11:53am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

By common logic this should be able to give twice the power compared to a 138 70H How can you tell, rotor surface area? It would be really interesting to know how it compares to me1507 and zero 75-7. I havent seen numbers on the rotor size on those, but it seems the 7 in 75-7 stands for 70h ? The q...
by j bjork
Jan 10 2021 9:46am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

https://i.imgur.com/l5QT6CK.jpg This is the "base" batteries I plan to use. Then it will depend on the controller, but it would be nice if I could use 24s (2x12s modules) These are hard to reconfigure, the terminals are welded on the cells. And the cages around the cells are welded togeth...
by j bjork
Jan 10 2021 5:34am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

QSMOTOR 180 9000W 90H PMSM IPM mid drive motor For a long time, we are developing and testing our new 8000w mid drive motor, below is the result For Motor Item: QSMOTOR 180 9000W 90H PMSM IPM mid drivemotor SPEC ·Motor Type: PMSM IPM Motor With Hall Sensor ·Rated Power: 9000W (18000kW peak in few se...
by j bjork
Jan 09 2021 4:03pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

This is just planning, I might very well end up just making a new shaft and moving it forward a bit from where the output shaft is now. Then I will get some extra clearance for a not too small sprocket on the other side, and settle for a 2 stage reduction with relatively small sprockets on the first...
by j bjork
Jan 09 2021 1:39pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

Sure, 2 stage would be a lot easier. But I think you are wrong about being able to have a 15toot sprocket on the other side. There are no chain guide as you say, but instead the chain has to fit between the sprocket and swing arm. And the chain is thicker than the guide. The transmission wont take u...
by j bjork
Jan 09 2021 9:09am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

I want to do a 2 stage reduction on this bike, but I think I will have to do 3 stage instead: https://i.imgur.com/SmWdo9o.jpg With the output shaft in the standard position there is not much room for a bigger sprocket on the other side, if I just used a shaft that goes from one side to the other. ht...
by j bjork
Jan 09 2021 7:17am
Forum: E-Vehicles General Discussion
Topic: Bosch Motorsports e-GoKart Powertrain Young Star
Replies: 7
Views: 638

Re: Bosch Motorsports e-GoKart Powertrain Young Star

Yes, it is nothing new. It has been on most Audi cars for the last few years. Not sure if it is Bosch or another manufacturer though. They use 48v systems on bigger engines (v6 etc.) and 12v on smaller (4 cyl)
by j bjork
Jan 09 2021 7:09am
Forum: E-Scooter and Motorcycle General Discussion
Topic: ME1507 vs QS motors
Replies: 13
Views: 842

Re: ME1507 vs QS motors

Correct, seems that MTPA was introduced in VESC: https://hackaday.io/project/164932-axiom-100kw-motor-controller/log/179447-mtpa-merged-into-vesc Then i guess next step is to get an axiom :D It has been a while since I read the axiom thread, but from what I remember it is high voltage and price. Bu...
by j bjork
Jan 08 2021 5:48am
Forum: E-Scooter and Motorcycle General Discussion
Topic: ME1507 vs QS motors
Replies: 13
Views: 842

Re: ME1507 vs QS motors

@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 Bartosh is testing the bac8000, but it dosent seem to encouraging so far. I...
by j bjork
Jan 08 2021 5:39am
Forum: E-Scooter and Motorcycle General Discussion
Topic: ME1507 vs QS motors
Replies: 13
Views: 842

Re: ME1507 vs QS motors

Another person here on Endless has a go kart build and used Goldenmotor, Motenergy ME1304 then a Zero 75-7. Nice, is there a build thread? Something that bothered me in the thread I linked to was that (from what I remember) the guy from ME thought the power was what to be expected. But you are righ...
by j bjork
Jan 07 2021 2:27pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

Nothing is decided yet, but I am looking at the qs 180 90h.
Qs recommends 750-850 phase amps, and 72-96V.
So I guess I should try to find a controller that can do 1000pA and 96V nominal in that case..

It would be nice with a 6 phase motor, and use dual controllers.
by j bjork
Jan 07 2021 6:46am
Forum: E-Scooter and Motorcycle General Discussion
Topic: ME1507 vs QS motors
Replies: 13
Views: 842

Re: ME1507 vs QS motors

I dont think there are much info available about the 180 motors, but you can find some around page 50 in the qs sales thread. Threads like this makes me doubt sevcon: https://endless-sphere.com/forums/viewtopic.php?f=30&t=109180 Interesting about golden motor: https://endless-sphere.com/forums/v...
by j bjork
Jan 06 2021 8:15am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Re: Yamaha YZ250F

Well, the connecting rod broke. I dont really know why so far. But first things first, checking weights: https://i.imgur.com/LEMHBG9.jpg https://i.imgur.com/YF0tkPm.jpg 49kg both front and rear. This is dry weght, no oil, no coolant and no fuel. Well, not even a chain. https://i.imgur.com/LYbcWTg.jp...
by j bjork
Jan 06 2021 7:47am
Forum: Battery Technology
Topic: Battery to battery charging
Replies: 13
Views: 486

Re: Battery to battery charging

I have a nuc 24fet, (not on this bike) nice controller but not powerful enough.
It is a nice feature, but it heats up both motor and controller.
So not very good if you want to ride hard right after charging.
by j bjork
Jan 05 2021 2:27pm
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 1271
Views: 130462

Re: Votol EM-100 & EM-150 controllers

Thank You. I will try to make the settings according to your recommendations. I would be grateful if you could show me how to activate the calibration mode and check the motor timing on the display screen. If you dont wan to wait you can look for it in the thread. It is already posted, I think it i...
by j bjork
Jan 05 2021 2:17pm
Forum: Battery Technology
Topic: Battery to battery charging
Replies: 13
Views: 486

Re: Battery to battery charging

Thanks fechter, that was the answer I was looking for.
I was mostly worried if there would be a problem with paralleling them.
They have fans, but it is probably a good idea to make a duct under the cooling fins and mount bigger ones.
by j bjork
Jan 05 2021 12:19pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Yamaha YZ250F
Replies: 21
Views: 913

Yamaha YZ250F

A bunch of money and:

Image

Resulted in this:

Image

Image

2018, It is supposed to have run 105 hours.
There is a little problem though:

Image

Image
by j bjork
Jan 05 2021 7:27am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Chinese 125cc + Honda IMA motor
Replies: 10
Views: 364

Re: Chinese 125cc + Honda IMA motor

Yea, kind of, the original nominal voltage is 144V and the nominal pack voltage I have is 96V which is 2/3 of its original spec. But despite this it should produce the same torque up to the max RPM so it's a matter of final drive gear ratio. I can always rewind it of it's if it's wildly underpowere...