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  1. perbear

    DW Documentary: Will Germany's Car Industry Survive

    Norway is way ahead on the electric car user side due to: 100% renewable electric power Political pressure to reduce GHG emissions and with no big thermal power plants, transport is a huge CO2 source Cars are heavy taxed based on weight & emissions. Making BEVs tax except gave them a...
  2. perbear

    BBSHD Brake Sensor - Hydraulic brake

    Do you have pictures of the brake sensor?
  3. perbear

    Potting Batteries, Thoughts and Experiments

    I think these battery packs are suitable for our velomobile but I have not found data on charging. As we use regeneration on our bike that is quite important. What is the charge rating of the 36V LiGo, peak and continous?
  4. perbear

    Project: Home made velomobile design with crank or mid motor

    Maybe something like this one? http://www.podbike.com
  5. perbear

    Mid drive motor with spur gear instead of chain

    And try to print it with a 3D printer in strong material. Then you can make herringbone style gears...
  6. perbear

    Project: Home made velomobile design with crank or mid motor

    I think it is fair result. Remember you get a lot of drag exposing the front wheels, and if your vehicle profile results in lift (or downforce) it will result in extra drag. I used the OpenFOAM based Caedium (http://www.symscape.com/node/1082) and it gave 11 N in drag at 10 m/s for my...
  7. perbear

    Project: Home made velomobile design with crank or mid motor

    Nice and impressive works! Have you considered buying premade seats? Alligt, NL sells a nice injection molded recumbent seat with two different glass fibre grades, PA6-GF30 and PA6-GF40: http://alligt.nl/afbeeldingen/100_2268.JPG The best thing is that a 3D CAD model of the seat can be found...
  8. perbear

    I'm making a k-drive

    Impressive, I really hope you get it to work well, it is very useful for velombiles! :) The Delft HPV team used such a drive in the VeloX 2: They complained about lower efficiency and that it was a fragile construction...
  9. perbear

    "pedal to charge battery" - better solution needed

    Low noise and mass is important for a series hybrid type pedal generator. Next year I shall build a series hybrid velomobil. This is my plan for the pedal generator: 1) Use a small hub motor with low noise. I plan to use Cute Q85 (1.7 kg) which is probably large enough. 2) Since these hub...
  10. perbear

    cute q100, 24v versus 36v and hall sensors support?

    Grin Technologies (ebikes.ca) has put Cute Q100 with 328 RPM winding thru their motor test stand. The result was used to define a cute Q100 motor model for their ebike simulator. So it is easy to find the approximate ebike performance using this motor before you build. Pretty neat for anyone...
  11. perbear

    Experimental Cargo Ebike Trip, Vancouver to SF Maker Faire

    Yes, in the EU all electronic devices connected to mains and consuming more than 75W need to comply to the standard EN 61000-3-2: Electromagnetic compatibility (EMC) Limits. Limits for harmonic current emissions (equipment input current ≤ 16 A per phase) With a suitable PFC harmonic current...
  12. perbear

    Experimental Cargo Ebike Trip, Vancouver to SF Maker Faire

    I see from the pictures that on the charger cover you have puts both C and US certifications plus a CE mark indicating compliance to European safety legislation. What EN standards have you planned to comply to? It would be nice if you cover enough to fulfil the charger requirements in EN 15194 -...
  13. perbear

    CycloTricity conversion

    Fortunately, they have now three different rear motors on offer, one for roller brakes, one for V-brakes and one for disc brakes: http://www.keyde.com/?do=product&lang=en&event=view&ids=12
  14. perbear

    I did a gun-control petition

    That's a pretty political.../quote] With the exception of tailor made target shooting firearms this is an exact observation independent of political view. In Norway it is fairly easy to aquire firearms as long as you have an acceptable reason for use (hunting, law enforcement, organized target...
  15. perbear

    Q85 250W motor current load issue

    I have Q85 front motor without rim/spokes. The weight on my IKEA scale is 1.72 kg. This is the narrow unit for rim brakes only.
  16. perbear

    EU is trying to kill the ebike!!!

    That is why we need to keep EU legislation sane and sound.
  17. perbear

    EU is trying to kill the ebike!!!

    At least there is some progress :lol: PS: Please send in the petition
  18. perbear

    EU is trying to kill the ebike!!!

    The latest proposal from EU on ebikes is a disaster. It will make it very difficult to make or modify ebikes in Europe. Only approved vehicle and parts will be allowed on or off roads. ETRA, the European light vehicle traders organisation, need your backing for objecting to the latest...
  19. perbear

    The T.I. bq78pl116 and bq78pl116EVM

    I am unhappy with Google groups so I will make my own homepages. The web hotel is up and running, only need to transfer contents from Google groups to the new site. Will try to do this real soon now. The new site is http://www.nohassel.org. Cheers, Per
  20. perbear

    The T.I. bq78pl116 and bq78pl116EVM

    I have made a 12S BMS based on the bq78PL114 chip. It is especially made for ebikes and works fine with standard RC LiPos using standard 2.5 mm c/c balancing connectors. A description of the BMS can be found on http://groups.google.com/group/nohassel. The balancing current is less than 100mA but...
  21. perbear

    Cute-85/Q85 250W Front Driving Hub Motor - BMSBattery/EcityP

    Remember that the EU limit is 250 W supplied by the wheel, not by the motor. It is also continous power, normally specified as S1, not the peak or time-limited maximum power, that is usually much higher. For example has the new Bosch Pedelec motor 250W S1 (continous) power but 500W peak power...
  22. perbear

    Repository for 3D Part Models, Drawings & Schematics

    I have made a complete 3D model of minimotor geared hubmotor (front) in Solid Edge, complete with internal parts. Enjoy :-)
  23. perbear

    New TI BMS chipset?

    Normally a reflow oven that functions well with QFN and other difficult packages is expensive. You may make one from a toast oven with additional temperature profiling electronics (not expensive). The additional accurate temperature control is important if you use fine pitch components or...
  24. perbear

    New TI BMS chipset?

    I (or rather my comrades) use a small but professional reflow oven with profile optimized for the leadless solder paste we have been using for several years now. A reflow oven is more or less required since you need to heat the board, parts and past very close to maximum allowable temperature...
  25. perbear

    New TI BMS chipset?

    John (and others using bq78PL114(S12)), For the moment I am waiting for the solder paste mask, I did not order it until I was certain the board was bugfree (as far as I can tell from the bare board). But as soon as we know something useful I will post results here or in the Nohassel group. Per
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