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E-bike design

  1. May 10, 2014 #1
    This is my requirement for one of my projects on E-bike.
    front wheel drive three wheeler with brushless DC geared motor.
    vehicle speed = 25 kmph
    Gross weight = 120 kg
    front wheel dia = 30 cm
    whether 250 Watts motor can able to achieve this requirement?
    What equations has to be used to find out the torque required to drive the vehicle on flat road???
    someone please help me out..
  2. jcsd
  3. May 10, 2014 #2


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    What have you tried so far?
  4. May 12, 2014 #3
    i have tried some basic formula to find whether the motor suits my requirements..but the answer is not coming
    first i tried to find out the motor speed from velocity using
    then with that speed i found out the torque
    then i compared this one with
    TE-Tractive effort
    RF-Resistance factor
    and P=F*v
    F= mu*m*g
    i am not sure where i had done the mistake
  5. May 14, 2014 #4


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    Do you need to use maths?

    How much power can a racing cyclist generate? Google it.
  6. Mar 19, 2016 #5
    Here's i given some specification-
    • Spoke to center (STC) technology allows better flex and traction on trails
    • Modern design with super slim profile
    • Industry-leading power-to-weight ratio
    • Power – 500W / 1000W
    • Torque – 25/50 Nm (18/37 lb-ft)
    • Weight – 3.9 kg (8.6 lb)
  7. Mar 19, 2016 #6


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    old thread alert.
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