Search found 832 matches
- 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...
- 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
Setting up the sevcon looks easy for you, it seems like it is not for most people
I am struggeling with the controller choice myself, it is hard to find a good powerful controller if not going the sevcon direction.

Setting up the sevcon looks easy for you, it seems like it is not for most people

I am struggeling with the controller choice myself, it is hard to find a good powerful controller if not going the sevcon direction.
- 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...
- 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...
- 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...
- 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?
- 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..
- 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...
- 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...
- 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...
- 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...
- 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...
- 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...
- 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)
- 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...
- 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...
- 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...
- 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.
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.
- 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...
- 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...
- 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.
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.
- 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...
- 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.
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.
- 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:

Resulted in this:


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



Resulted in this:


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


- 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...