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We had a similar problem and need regarding hand crank generators. Our solution was to partner with the engineering program at our local university. The university, UNCC, has a senior design program. A pair of ME majors developed a generator using a gear reduction DC motor housed in a custom designed 3D printed shell. The first one failed within 30 minutes.
The next year we sent in the same project as a redesign. The new one worked much better. To the astonishment of UNCC staff, this time the visitors ended up stripping the gears inside the gear reduction motor. We have since changed to a different gear ratio motor and have had minimal issues, other than a little more current than we like. The generators put out a max of 17 volts with a peak current of 1.4 amps. Each generator has a built in trim pot to control the total power output.
Tim Pula
Explore More Stuff Lab Manager
Discovery Place, Inc.
301 North Tryon Street
Charlotte, NC 28202-2138
704.372.6261 x492
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-----Original Message-----
From: Informal Science Education Network [mailto:[log in to unmask]] On Behalf Of Dan Zevin
Sent: Friday, March 08, 2013 10:32 PM
To: [log in to unmask]
Subject: Need a more robust hand crank generator
ISEN-ASTC-L is a service of the Association of Science-Technology Centers Incorporated, a worldwide network of science museums and related institutions.
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Greetings,
We're looking for a robust yet small, lightweight hand crank generator that can withstand a lot of use by teenagers. This one gave us about 20 hours of use before the small handle snapped off: http://www.k-tor.com/hand-crank-generator/
The crank needs to output at least 10W of power.
If you've got suggestions for something better, we'd love to know about them!
Thanks,
Dan
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Dan Zevin
Public Education Specialist
Space Sciences Laboratory
7 Gauss Way, MC 7450
University of California, Berkeley
Berkeley, CA 94720-7450
(510) 642-8326
(510) 643-5660 [fax]
[log in to unmask]
http://cse.ssl.berkeley.edu
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AST:7731^29u18e3
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For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.
Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
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