Search found 889 matches

by j bjork
Jan 20 2021 12:36pm
Forum: Motor Technology
Topic: Split phases and run dual controllers?
Replies: 9
Views: 384

Split phases and run dual controllers?

On my new build I will run the new QS 180 90h mid drive IPM motor. The problem is to find any good, powerful controller and then fit it on the bike.. So I am considering splitting the motor phases by mesuring strand by strand in to 6 equal phases and run dual controllers. The strands will then be pa...
by j bjork
Jan 20 2021 8:39am
Forum: EBike Technical
Topic: building the BESC - 100V, 400A motor controller
Replies: 53
Views: 3113

Re: building the BESC - 100V, 400A motor controller

It would be nice, but dont use M5. Isn't there an M6 version?
by j bjork
Jan 20 2021 3:12am
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

Re: Yamaha YZF250F

I hope this works, here you can see what difference higher phase amps make: https://ebikes.ca/tools/simulator.html?motor=MX4503&batt=cust_100_0.01_8&cont=cust_200_200_0.03_V&cont_b=cust_200_400_0.03_V&motor_b=MX4503&batt_b=cust_100_0.01_8&bopen=true Basically you get more tor...
by j bjork
Jan 19 2021 2:08pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

Re: Yamaha YZF250F

I have seen them before, but that was some time ago. It seems to be mote info now, there was detailed info of a lot of features. The 84V max voltage dosent sound that inspiring, but it seems like it is possible to use up to 92V "possibly with reduced output" And it seems like it is not pos...
by j bjork
Jan 17 2021 2:22pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

Re: Yamaha YZF250F

It looked a little interesting, but it was hard to see much of it on these small pictures. (You had to be logged in to get bigger pictures) I wonder if it is better than just using 2 sprockets and a chain, I guess I will have to do some calculations to find out. I guess the final gear can be a littl...
by j bjork
Jan 17 2021 1:42pm
Forum: EBike Technical
Topic: building the BESC - 100V, 400A motor controller
Replies: 53
Views: 3113

Re: building the BESC - 100V, 400A motor controller

Interesting to see that you are making progress :)

I played a little with the vesc tool, but I didnt have a controller to connect to.

I think vesc should have mtpa and field weakening now, but I didnt see anything about it in the vesc tool.
Do you know if they will work on this board?
by j bjork
Jan 16 2021 1:57pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

Re: Yamaha YZ250F

Similar bike, but I will have 2 or 3 stage reduction so I get the sprocket in a better position and get better gearing.
I will not have the battery modules open like that, I will build some kind of case for them.
I dont want my batteries wet and muddy..

My modules are from vw passat gte.
by j bjork
Jan 16 2021 4:51am
Forum: Motor Technology
Topic: KBL96251 trouble (24" 2x Motor bike build)
Replies: 31
Views: 673

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: 13
Views: 675

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: KBL96251 trouble (24" 2x Motor bike build)
Replies: 31
Views: 673

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 Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

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 Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

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: KBL96251 trouble (24" 2x Motor bike build)
Replies: 31
Views: 673

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: 5594

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 Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

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 Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

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 Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

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 Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

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 Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

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 Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

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: 9
Views: 934

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: 1033

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: 1033

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: 1033

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 Build Threads
Topic: Yamaha YZF250F
Replies: 68
Views: 3498

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.