Hello, I'am new to this forum and this is actually my first post. And I have some questions about regaining braking energy.(adsbygoogle = window.adsbygoogle || []).push({});

We are thinking of using an electric motor to speed up and slow down a new and innovative train. The idea is to regain energy while the train is slowing down with the electric motor.

I've read some articles on the net about braking with electric motors and regaining energy, but I can't seem to find any good formula's for calculating the regained energy. The formula's I found are hard to understand and they differ a lot with other websites.

Maybe you could help me out. I would like to hear some idea's and formula's from you.

Thanks,

some specs of the train:

20 tons, 20.000kg

top speed 250 km/h , 70m/s

it rides on wheels, r=0,5m (max)

some formula's I found:

pdf url document from an electric motor manufacturer.

http://www.reliance.com/prodserv/standriv/appnotes/d7743.pdf

The formula's who are in this pdf document arent clear to me. Maybe because I'am familiar

with the metric system

http://img693.imageshack.us/img693/3609/formule.th.jpg [Broken]

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Regenerative Braking Energy

**Physics Forums | Science Articles, Homework Help, Discussion**