Discussion in 'Electric Bicycles' started by LipoEbiker, Nov 9, 2010.

  1. LipoEbiker

    LipoEbiker New Member

    A solution to many problems as suggested and a few more!
    1 start off with a 5 pound 1500 to 4000 RPM 1000 watt rated motor at 88 to 93% efficiency. This would consist of a 5 1/4 od Stator and a 4"dia rotor with 12 or 14 poles usig N-50-H hi temp magnets. Parallel Y windings to fill the lams up with the most copper with the right amount of turns to get a kv of about 55.5 RPM per volt with about 4 to 5 lbf·ft per amp in 3 phase design where the freespin rpm does not have to many losses until above 5000 rpm. The super inductance from the PM rotor design is what will supply instant on demand torque as needed and still have a wide rpm efficiency. The size required of a aluminum case would be 5.25"od X 2.5" with a 1" X 17mm or 5/8" shaft.

    2 Motor drive sprockets from 9 teeth to 14 teeth (12 tooth is preferred for the average hills) Composite wheel hub sprockets on a gokart type hub adapter from 80 to 92 teeth. (90 tooth is preferred for steep hills) and over 25 mph on the flats on a single ratio.

    3 The right chain for each drive. A 1000 watt motor used with either #35 or #219 chain adjustment is minimal and you will never need to replace the chain. The pedal chain can go straight to a derailer or a multi speed infernal gear hub. Using a 1000 motor to a legal speed of 20 MPH on the steepest hills Anywhere you only need ONE gear ratio for exlent performance and efficiency at any speed up to 25 MPH at 72 volts. The single reduction for the motor can go on either side of the wheel and can go on either side with the use of a derailer Multi Gerard hub or Both using a Sram Dual Drive hub with a freewheel for the motor and a pedal chain freewheel ot freewheel cassette used in common with 3 speeds that shift the motor and pedal drive at the same time. The sram Dual Drive with both the chains on one side is the nicest if you can find all the parts. The low gear and the high gear allows for extra high torque for extra loads on hills and the 3rd gear allows for good motor efficiency up to 45 MPH. You can pedal up to about 32mph with a cadence of close to 100 rpm. A easy fix is to shift up the next larger size pedal chain-ring. A bike without pedals is a breeze to adapt.

    3 Finding a bike you can mount it on with some batteries.

    4 FUN!:cool:

    Try to get your state to allow it ? :tt1:

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