Power Spring Design?
Power Spring Design?
(OP)
I am working on a spiral spring powered dynamo system. Where a dynamo is driven by spiral spring through gears.
I am new to the spring design and need help in designing. Does anyone know how to design a spring that could store 100 kilo Joule of energy? The energy stored in the spring will then be used to drive a gear box which in turn drives the dynamo motor connected to it.
Also, please suggest the type of spiral spring that could be used, the best website/book/software that could be used for spiral spring design.
Thanks a lot
I am new to the spring design and need help in designing. Does anyone know how to design a spring that could store 100 kilo Joule of energy? The energy stored in the spring will then be used to drive a gear box which in turn drives the dynamo motor connected to it.
Also, please suggest the type of spiral spring that could be used, the best website/book/software that could be used for spiral spring design.
Thanks a lot





RE: Power Spring Design?
That's about 1kg lifted straight up 10,000 meters, if the metric conversions are working right.
RE: Power Spring Design?
1 j = 1 N*m
1 kJ = 1000 J = 1000 N*m
100 kJ = 100*1000 N*m = 10'000 kg*m approx
RE: Power Spring Design?
RE: Power Spring Design?
http://www.vulcanspring.com/downloads/spring-desig...
RE: Power Spring Design?
You are just going to have to learn how to do this. Your 100kJ is stored in your spring as strain energy, E=δF/2.
You need to select material, design a spring, and test your design for stored energy, yield stress and metal fatigue. If it does not work (and it won't), you need to tweak your design and try again. I agree with the others that 100kJ will be a challenge. I think you will wind up with a weird shape.
--
JHG
RE: Power Spring Design?
Keith Cress
kcress - http://www.flaminsystems.com
RE: Power Spring Design?
RE: Power Spring Design?
Jboggs: Thanks for the list, I'll contact them.
byrdj: Thanks for the link, I am looking for detailed flat spiral power spring design, please suggest me formulas/books/software that I can refer while designing.
drawoh: Is there a paper/formulas that I can refer to design a flat spiral power spring which uses all the design aspects that you are suggesting.
In detail description on spring design:
I am working on a flat spiral spring powered dynamo system. Where a dynamo is driven by spiral spring through gears. The spring needs to provide a constant torque of 1 Nm for 3 hours.
Can someone please suggest design formulas that can be used to design such spring.
Thanks a lot guys, you have really provided lot of suggestions.
Regards
RE: Power Spring Design?
We are back to how much energy you want to store.
RE: Power Spring Design?
RE: Power Spring Design?
1 rpm is a lot different to 100
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RE: Power Spring Design?
RE: Power Spring Design?
Cheers
Greg Locock
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RE: Power Spring Design?
Regards
RE: Power Spring Design?
RE: Power Spring Design?
RE: Power Spring Design?
Andy
RE: Power Spring Design?
If you are going to design stuff like this, you need a copy of Roark's Equations for Stress and Strain. Other than that, I suggest you pull out your mechanics of materials texts and read up on strain energy. This is how complex beams are solved, even when they are not springs.
A handy tip, especially given the safety warnings above: When you assemble your mechanism, your spring should be compressed by a screw or a nut, not by hand. When I do this, I make studs long enough that I can install the clamping nut by hand, even though I will need a wrench to do the actual compression.
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JHG