1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Intelligent motor e-bike

  1. Sep 18, 2013 #1
    hi, i am doing an electric bicycle project. The basic improvement required would be the asist of the motor using arduino to solve for the high starting torque of the bicycle. And i don't know where should i start??? Is there any comments?
    Last edited by a moderator: Sep 18, 2013
  2. jcsd
  3. Sep 19, 2013 #2


    User Avatar
    Science Advisor

    The torque on the shaft of a DC motor is directly proportional to the current. It is probable that the lack of torque is due to the motor current being limited by the resistance of the motor. The battery voltage is probably appropriate for running speed, but not for starting.

    A motor has a current rating and it's shaft is made strong enough to handle the resulting torque. If the starting current flowing is not the maximum rating then you might consider the following. If you could momentarily connect two batteries in series, you could get twice the voltage, so twice the starting current and twice the starting torque. Once moving, switch the batteries back into parallel.

    It might be wise at this stage to familiarise yourself with switching motor controllers such as the H-bridge. http://en.wikipedia.org/wiki/H_bridge
  4. Sep 19, 2013 #3
    I would imagine what the motor is ment to be then design it on paper
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook