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Forum Index : Other Stuff : Concept for pedal generator..
| Author | Message | ||||
| KiwiJohn Guru  Joined: 01/12/2005 Location: New ZealandPosts: 691 |
I have played around with a pedal generator and learned a few points among them the need to avoid friction as much as possible, to avoid gearing stages and to recognise that pedal power is not smooth. So I came up with this concept:- 
The generator consists of a wooden disc wheel, heavy MDF, or some such. This large diameter wheel provides an effective flywheel which is really necessary for a pedal machine. The generator consists of a few coils, four might be enough, arranged in pairs either side of the disk and connected together via a soft iron 'saddle' (i.e. 'U' shape) pole pieces. The magnets are mounted in holes in the wheel and pass between the coils. Now the interesting bit is that magnets are not uniformly placed around the wheel but instead are grouped so that maximum generator effect occurs at the two points in the cycle where pedal pressure is highest and none, or very few, when the pedals are at top and bottom. |
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oztules Guru Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
Thats downright cunning ....... I like it. ..........oztules Village idiot...or... just another hack out of his depth |
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| matt down south Regular Member  Joined: 20/10/2007 Location: AustraliaPosts: 50 |
maybe another set of switchable coils for warm up/power runs or female/male share exersize generator via a double/tripple pole switch matt |
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| KiwiJohn Guru Joined: 01/12/2005 Location: New ZealandPosts: 691 |
.... I think the way to do that Matt would be to adjust the load. |
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| BjBlaster Regular Member Joined: 04/04/2008 Location: AustraliaPosts: 55 |
I finally put together a F&P exercise bike. It's on my project page here. It's a bit rough, but I wanted to get it going and my wood prototype is working better than ever :) To control the load I used a basic adjustable FET to limit the charging current to warm up and slow down on. I really wanted to adjust the SMPS duty cycle but the old laptop power supply is fully potted (sealed) so you can't get in to do any mods. Have a look at the load controller on my blog here I'm going to make a rowing machine next.... Cheers Bj Check out my projects here in: Bj's Shed |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5031 |
Hi Bj Mate I've just had a look at your web site. Its bloody good! May I link to it from my Links page? Hey guys Bj has completed some very cool projects, I especially liked the electric whipper snipper with its little red battery trailer. http://www.bjblaster.com/ Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| BjBlaster Regular Member Joined: 04/04/2008 Location: AustraliaPosts: 55 |
Of course you can :) I'm glad you like it... it's sort of ended up being a live blog of my projects as I do them. I'm waiting for my holidays to get stuck into some more! Cheers Bj Check out my projects here in: Bj's Shed |
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GWatPE Senior Member  Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi Bj, I like the gold paint. This will protect the plastic quite well, but I think the ferrite magnets won't rust. I had some on an algae scraper in a salt water fish tank. I never saw rusting in over 10years. Neo is a different story though. Gordon. become more energy aware |
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| BjBlaster Regular Member Joined: 04/04/2008 Location: AustraliaPosts: 55 |
Well there you go - you learn something new everyday. I suppose you guys would know this from having your F&P mills out in the elements all year round :) I did find a lot of iron filings rusting in the magnets, so after cleaning them up they did look quite rust free... Check out my projects here in: Bj's Shed |
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sPuDd Senior Member Joined: 10/07/2007 Location: AustraliaPosts: 251 |
Bj, I've have not been able to see your site for quite a few months now. I'm on an Internode DSL account. Is your site up? I've been thinking you took it offline or moved it. It shows the header line at the top of IE, but fails to load. Has Internode wrongly blocked you? Maybe Chairman Rudd has blocked my access to you? sPuDd.. It should work ...in theory |
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| BjBlaster Regular Member Joined: 04/04/2008 Location: AustraliaPosts: 55 |
I'm with Amnet in Perth, and you should be able to reach it unless your ISPs DNS tables aren't updated or they buy their internet from somewhere in india or not here! Damn this interweb thing, one minute it works, the next it doesn't ever again! I've had 100% uptime for nearly 2 years in a row so check with your ISP as it could be blocked for some unknown reason. Let me know how you go. Cheers Bj Check out my projects here in: Bj's Shed |
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| sPuDd Senior Member Joined: 10/07/2007 Location: AustraliaPosts: 251 |
Bj, Sent an email to Internode, got the generic check firewall and virus scanner response. Low and behold a few days after the email I can see your site again! 
Happy Days... sPuDd.. It should work ...in theory |
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| BjBlaster Regular Member Joined: 04/04/2008 Location: AustraliaPosts: 55 |
Fantastic! I love the way companies say it's not them, then magically it all works again after you give them a stir 
While I'm here, don't forget to fight for our Internet rights - we don't want our traffic filtered/censored! Australian Internet Filtering Petition join in petitions like this if you feel that it is wrong. Now back to pedal powered F&Ps :) Cheers Bj Check out my projects here in: Bj's Shed |
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