E-bike design

1. May 10, 2014

anas@pibeam

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???

2. May 10, 2014

What have you tried so far?

3. May 12, 2014

anas@pibeam

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
v=2*pi*r*N/60
then with that speed i found out the torque
p=2*pi*N*T/60
then i compared this one with
T=TE*r*RF
TE-Tractive effort
RF-Resistance factor
and P=F*v
F= mu*m*g
i am not sure where i had done the mistake

4. May 14, 2014

CWatters

Do you need to use maths?

How much power can a racing cyclist generate? Google it.

5. Mar 19, 2016

Newsome

Here's i given some specification-
• Spoke to center (STC) technology allows better flex and traction on trails
• Modern design with super slim profile