Science Buddies: "Ask an Expert"

hi, m using a brushless dc motor for a electric car project and i need a min. speed of 80kmph. So can u tell me the specification of of motor should i use. i.e, rpm. n watt consumption.
Again advise me the battery i need to run the motor for 1 hr.
Thanks

Since this is in the grades 9-12 forum, I will assume you know the basic kinematic equations. If not, look here: http://wiki.answers.com/Q/What_are_the_ ... _equations.
From these, you can see that you would need to know either how long you can wait for your final velocity, or how far. These equations assume no air resistance, which is not "real world", but you can make some assumptions. You would also need to determine the mass of the final vehicle, including the motor. Do you have numbers for these things? (the mass of the vehicle and how long / far to wait for final velocity)? If so, please post them and we can work on the answer.

Keith

hi i want to know how much capacity of lead acid battery would i require to run a brushless motor of 1200rpm, 52nm torque and 6.5kw...
Give the voltage and current required to run the motor for 1/2/3 hrs. as feasible.

Hi justchill.jun,
I see that you have already posted this question in another forum and have received some guidance:
http://www.sciencebuddies.com/science-f ... =29&t=4795
We ask that you please ask follow-up questions in your original topic so that experts can see the background to your problem. Also, it would be helpful if you could explain any specific questions you have about details of the answers that have already been provided. For example, if you don't understand some term, or if you don't understand a certain calculation, please let us know. You should also give information about your level of education, current school setting, and why you are doing this project so that experts can provide appropriate responses.
Thank you,
Chris