Using a Stepper Motor as a generator

Pedal-A-Watt Stationary Bike Power Generator

I would like to make a human powered generator for an art project.

Challenge: I am curious if a couple of NEMA 34 motors is large enough to capture all the power that a human can generate.

I’m looking at a couple of applications.

1) To run a 120V toaster. I suspect this might need as many as 5 people to peddle. Also to run a 60W incandescence bulb.

2) To charge a 12V battery.

I’m suspecting that a stepper motor is a good candidate to make the electricity. I think the first part of the project is to make up some BOMs that show what motor to use, the RPM that it would require and parts for a rectifier and whatever else is necessary to operate in these applications.

Does anybody know of any existing projects or have any recommendations?

Richard Guy Briggs brought the Pedal-A-Watt Stationary Bike Power Generator to my attention (in the picture). I think if we could figure out what motor it is they are using for a generator, that might be the thing to get.

I just added another link below where the motor looks the same. They’re calling it an Oatley DC motor.

I found it here for cheap. Here’s another.

A nice 500W.

A nice 350W.

Here’s a DIY 1000W one.

Another DIY using Volvo parts (more).

I noticed they claim the Oatley works well in a windmill (which would be low RPM). Well that one claims it only got to 5V, but that’s pretty low RPM so this might be promising.

http://www.econvergence.net/electro.htm
http://3nima.blogspot.com/2008/02/motors-24-volt-motors-24-volt-36-volt.html

http://www.los-gatos.ca.us/davidbu/pedgen.html
http://www.thebackshed.com/Windmill/Oatley-windmill.asp

Generator

http://theidea.bz/forum/index.php?topic=2577.0
http://makezine.com/extras/25.html
http://madscientisthut.com/wordpress/?tag=stepper-motor-generator
http://theidea.bz/forum/index.php?topic=2577.0
http://forums.makezine.com/comments.php?DiscussionID=112
http://www.gotwind.org/diy/stepper_motor.htm
http://www.reuk.co.uk/Electricity-with-Stepper-Motors.htm
http://www.thebackshed.com/Windmill/assemblyMini3.asp
http://RideMore.ca
http://tricolour.net/bicycle-generator.html
http://www.thebackshed.com/