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Thread: Torque converter on electric moped

              
   
   
  1. #1
    Senior Member DRZ400's Avatar
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    Torque converter on electric moped

    Found this on you tube....something I always wanted to try. He put a Comet TAV torque converter on EV bike. Doesn't say much other than it blows belts.

    https://www.youtube.com/watch?v=3w2Ni2zrrL8
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
    Alltrax SPM72400, 400 amp Controller, all LED lighting
    2014 CRF450X Supermoto
    http://www.evalbum.com/1955
    http://www.evalbum.com/3337

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    Senior Member Hugues's Avatar
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    Interesting, i mean, the torque converter way of working, i was not aware of how they worked.

    The guy is using a mechanical one, but the main type are hydraulic ones used in automatic transmissions, as explained here:
    https://en.wikipedia.org/wiki/Torque_converter

    and demonstrated here:
    https://www.youtube.com/watch?v=z5G2zQ_3xTc

    Any advantage of using an hydraulic torque converter on an electric bike ? Maybe i could fit one in my rear wheel, although they look rather heavy and complicated.

    We don't need the de-coupling of the motor and the wheel as needed with gas engine, but the doubling of the torque near stall speed could be cool.

    But maybe i'm just talking out of my ass here, what do I know...just tell a guy he can double his torque and half of his brain shuts down and the other half is just trying to imagine how would that feel when the green light comes on.
    Regards from Switzerland
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    Senior Member DRZ400's Avatar
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    The mechanical units are used on snowmobiles, side by sides and scooters (Ruckus) by the ba-zillions! Be cool to find a small hydraulic unit....but I think the autotrans pump plays a role too? Or could it be used stand alone by filling with fluid. You would then need a spline output to sprocket. Looks like the output shaft is not designed to be side loaded however.
    Last edited by DRZ400; 09 September 2015 at 1218.
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
    Alltrax SPM72400, 400 amp Controller, all LED lighting
    2014 CRF450X Supermoto
    http://www.evalbum.com/1955
    http://www.evalbum.com/3337

  4. #4
    Senior Member Hugues's Avatar
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    Well, the fun did not last long,
    According to this article:
    http://auto.howstuffworks.com/auto-p...converter4.htm

    The torque doubling effect near stall speed only happens when the motor is spinning much faster than the transmission.

    Would be a bit strange to have your electric motor iddling when bike is stopped.
    Regards from Switzerland
    My 2.5 Upgrade Thread

  5. #5
    Senior Member DRZ400's Avatar
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    The motor would be turning much faster from zero mph closing in until to hit your top speed. Idle doesn't matter.
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
    Alltrax SPM72400, 400 amp Controller, all LED lighting
    2014 CRF450X Supermoto
    http://www.evalbum.com/1955
    http://www.evalbum.com/3337

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    Read down further in the comments. This is what the vid poster says: "@theslowblade It's made by GTC. It has an incredible torque output but it wastes a lot of power and the belt's do not hold up well to the excessive torque. It's made for a go-kart so it was highly modified (new motor mount holes, welding, CNC milling, lathe machining etc). It was a fun project but I will probably switch back to direct drive, it handles the torque just fine and is very efficient."

    This is seems to be the typical outcome for people (some of them excellent designer/ fabers) who try to use these variable speed drives.

  7. #7
    Senior Member DRZ400's Avatar
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    Sure...but the temptation to try is the big torque increase off the line. We need a 2 speed tranny like RC cars have 10:1 switches to 5:1 after 40 mph!
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
    Alltrax SPM72400, 400 amp Controller, all LED lighting
    2014 CRF450X Supermoto
    http://www.evalbum.com/1955
    http://www.evalbum.com/3337

  8. #8
    Senior Member tomdb's Avatar
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    just get a planetery gear set with lockers. just like drag cars have. Reduction to start then straight through.

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    The RC two speed is something like Tesla tried with their early Roadsters. The massive amounts of torque kept tearing up the two-speed boxes. Their solution, as I heard, was to go to a HD single-speed reduction box and increase the size of the motor by 20-25%. And the rest, as they say, is history.

    Multi speed boxes may be useful , like you say, for performance or in commercial vehicle carrying widely varying loads. But these belt-drive variable speed drives are a very inefficient way to go. Some need cooling fans almost as large as the cooling fans on the ICEes driving them.

    Or,is this just your sneaky way to resurrect the never ending "transmission" debate? Things a little slow for ya on the ole El Moto?!!

  10. #10
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    don't forget the Silver Giant II.

    http://truecousins.dk/silvergiant/si...giant%20ii.htm

    https://www.youtube.com/watch?v=mYqG-qxfJZM

    It had a two speed tranny. Was superseded by big motor/controller/battery...no tranny Silver Bulitt

    .https://www.youtube.com/watch?v=ntk5rlv14HI

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