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  1. Goethe

    Yamaha YZ250F

    140 kg with 8kWh. Top speed 185 km/h.
  2. Goethe

    Yamaha YZ250F

  3. Goethe

    Yamaha YZ250F

    Sorry for hijacking your thread! 🙏 It’s a really nice build you are doing and I really really hope that the 3shul controller will work out fine. The qs180 did get to hot at the power level we needed. We dynoed 30kW at the rear wheel. We got approx 10 min in race pace before it got to hot. I...
  4. Goethe

    Yamaha YZ250F

    I’m building it right now. Me and my company have built a bike during the winter that I have been testing on race track until recently when we decided to sell the bike. I was supposed to race it two weekends ago but we sold it right before that. That bike had a qs180 and Fardriver. I’m going for...
  5. Goethe

    Yamaha YZ250F

    Hello Guys! Nice to have a Swedish fellow that also are trying a 3shul. I have ordered a cl1000 for a roadracing bike that will compete in the next race of the National championship. It’s only 4 weeks to the race so @Hackey, no pressure…. 😄
  6. Goethe

    Loosing sync when leaning and warm (HS3540)

    I use Anderson pp45. They dont look so happy so I will change those for something Thanks for the good inputs!
  7. Goethe

    Loosing sync when leaning and warm (HS3540)

    Hi! My HS3540 paired with a sinewave controller stutters when I lean in curves and put on some throttle. When the motor is cold there are no issues. But the warmer the motor gets the less lean angle and less amps it takes to get this problems. If I keep on riding It will get this problem even...
  8. Goethe

    Daisy chain BMS's.....risks?

    Hi! :D I about to move my BMS's out from being in series with the batteries in to braking the main power to a DCDC. I have measured the resistance between the negative balance lead and the In/Out connections of the BMS and it seems to be galvanic separated. Would be OK to do it like this or...
  9. Goethe

    Goethe's Mongoose Pinn'R + HT3525

    Hi! :D This bike I'm building for my 12 year old nephew. I will deliver it as ridable in dry condition and my brother will water and crash proof it later on. The bike is a really sweet ride! I've been enjoying my debug trips so much it's gonna be tough to give the bike away! :D Current...
  10. Goethe

    How to retro-fit halls in a HS3525?

    Honeywell ss411a are installed and working fine! The slots were on the other side of the stator opposed to what Doctor Bass guide said, they are on the same side as the phase cables. Maybe the side is random when the motor is built as sensorless?! I hade to use the grinder on the slot of the...
  11. Goethe

    How to retro-fit halls in a HS3525?

    Ok, thanks! I have bought halls and will mount them today.
  12. Goethe

    How to retro-fit halls in a HS3525?

    Hi! :D I put all eggs in one basket and went for sensorless HS3525 motors and controllers for three bikes I'm building. I finally got one of the bikes running but it only works satisfying at modarate amp's. It seems that pulling more than 35A is not possible without the controller loosing...
  13. Goethe

    Vaporware and failed EV companies

    AFAIK are there no individual who has leased a car. Some cars has gone to utility companies thats been involved in the project. The rest of the cars has gone to different companies that wants the enviromental profile. But whats important is that the product is carrying its costs and its out on...
  14. Goethe

    Vaporware and failed EV companies

    The Volvo C30 electric is NOT vaporware! The business case has been clear from the beginning that the car is only able for leasing. The project plan was followed and the car was released in time. All cars are now out on the streets in the hands of people who has leased a car. I'm working with...
  15. Goethe

    Lebowski's motor controller IC, schematic & setup, new v2.A1

    Amazing job you have done Lebowski! I would very much like to contribute to the work with integrating your code/chip in ebike controllers. I have been building ebikes for a while and have pretty good theoretical and practical skills with electronics and electric propulsion. My daily job is as a...
  16. Goethe

    Rescue low voltage Headway cell???

    I discharged one of the high SOC cells and I pulled out 11.7 Ah from a 12 Ah cell so they have had very little discharge. I have not tested every cell with the CBA so I don´t know the SOC of the cells that has 3.2 V. All of the low cells are now charged to SOC 25-50%, they responded quick to...
  17. Goethe

    Rescue low voltage Headway cell???

    Good idea... A+ = Very low discharge cells A = Normal cells B = High discharge cells /Göran
  18. Goethe

    Rescue low voltage Headway cell???

    I've single charged 2 cells now @ 0.05C until they reached 3 V then I charged them at 0.5C to about 50% SOC. I discharged one with my CBA III at 0.5C and it had about 50% capacity in it. Looks like they are OK then?! It´s strange....some of the cells are still close to 100% SOC and some are...
  19. Goethe

    Rescue low voltage Headway cell???

    Hi I've left my new Headway 38140 in storage to long without charging. Some of the cells are now in the 1,2-2,0 V range. What is the best way to save this cells? The cells are new and have never been used. BR Göran
  20. Goethe

    Doing the Math

    KF, have you thought of a stator solution with PCB's ? The one on the picture is 780 µm thick and contains 140 gr copper. They can be stacked in unlimeted number. /Göran
  21. Goethe

    Doing the Math

    Ok now it make more sense! :mrgreen: This is really a cool project! I will reset my brain with some sleep now, and hopefully I have forgotten all about iron stator and rotors and radial flux tomorrow. :wink: /Göran
  22. Goethe

    Doing the Math

    Ahaa! Sorry didn´t mean to get you off track! So you already have a coreless motor? Or are you designing one? Is the example with a flat spiral coil moving through a uniform magnetic field close to the real design? And what is K.I.S.S? /Göran
  23. Goethe

    Doing the Math

    To increase the efficiency in a motor without total redesign I would start to look at the magnets and airgap. I have been going through my papers and some stuff I've found on the web and I think we have to restart this whole thing from another angle. The magnetic flux is built up from many...
  24. Goethe

    Doing the Math

    I've tried your calculator and it worked fine! I think it would be wise to start calculating with the 2.53 m as only the part of the wire that is peripendicular to the magnetic field. /Göran
  25. Goethe

    Doing the Math

    No absolutely not! :D This is really interesting and I find very educating for me. It's just that I got many projects running and ideas spinning around in my head right now so I haven't got the mental rest to focus at this properly. I will get in the game soon! :D /Göran
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