Building a pedal power bicycle 12 volt generator, ghetto style - Page 2

MetroMPG · 01-15-09, 07:51 AM

Over at EcoModder.com, someone commented...

Quote:

Check "Livin' with Ed" on the Green channel.. he does this every morning to make his toast... 15 mins on the bike.

I don't know if the blower motor will be the most efficient source of energy... I'd think using a car's alternator might yield you better results.

Yeah, I've seen Ed makin' his breakfast before. On "Cool Fuel Roadtrip" I think.

I'm under the impression that the perm magnet motor is a bit more efficient than a car alternator. According to Wikipedia, a modern alternator is only between 50-62% efficient. Though the output of the alternator can be much more than this motor.

MetroMPG · 01-15-09, 10:59 AM

A couple of people have expressed doubt about the suitability of my little motor/generator. I have to admit, I decided to use it based on a W.A.G. of its specs. Am I'm going to burn it out?

I just tested the blower in my car (it's the same size motor I pulled from the older - same - car). On the highest setting, it pulled 9.1 amps @ 12.5 volts or 113.75 watts (car not running).

That's great, since that must be its continuous "rating".

How does that measure against the amount of power I can transmit through it? Well, based solely on remembering the readouts on the stationary bikes at the Y, 100 watts is a light-moderate amount of effort. Sustain that long enough and you'll break a sweat.

Of course it's possible to put out peaks of much more than 100w, but I'm not going to be riding this thing for long periods or doing sprints on it.

So I'm thinking it's going to be just fine.

Tony Raine · 01-15-09, 11:57 AM

cool idea!

heres a thought though. belt drive. take the tire off the rim, and run a belt to the motor. the shape of the rim should keep the belt in place. an old v-belt (or maybe even a serpentine) should work.

i once took the cover off my elliptical machine to see how it worked. resistance was increased by tightening a belt around the "wheel" in the back. now you got me thinking........

palisades EAST · 12-08-11, 10:56 AM

Hi, we are 3 students at palisades charter high school in Los Angeles California...in our elective class called E.A.S.T., we work on projects that benefit the community and environment. so we saw your generator model and we made our own version (see pictures attached). We ran into two problems along the way:
1. the bike couldn't pedal because the kickstand was in the way...we were wondering how your bike worked if it had a kickstand at all
2. how to put on the generator (some instructions from your model would really help)...we used the alternator/generator model: MY1016 24 Volt 250 Watt Motor with 5M Belt Sprocket

please respond as soon as possible
and feel free to give us any new projects that you have

MetroMPG · 12-08-11, 04:04 PM

Hi Palisades students...

Quote:

Originally Posted by palisades EAST

1. the bike couldn't pedal because the kickstand was in the way...we were wondering how your bike worked if it had a kickstand at all

No kickstand on my bike.

I made a custom bike stand out of 1x4 wood. You can see several photos of it in this post: http://ecorenovator.org/forum/applia....html#post1731

Quote:

2. how to put on the generator (some instructions from your model would really help)...we used the alternator/generator model: MY1016 24 Volt 250 Watt Motor with 5M Belt Sprocket

I drove the motor directly via friction off the side of the tire.

Whether that will work for you or not will depend on what speed the motor needs to turn to generate the needed voltage.

You can see photos here showing how I mounted my motor. It was easier for me because the motor had a large flange on it, making it easy to mount to wood. Yours might need a different approach.

http://ecorenovator.org/forum/applia....html#post1732

MetroMPG · 01-15-09, 12:30 PM

That's funny: I took apart my dad's exercise bike over Christmas. (Was mulling over this project, and wanted to see how it worked.) Same deal with the friction belt on what amounted to a chain-driven flywheel.

The belt/rim idea works, but then it complicates using the bike as a bike if I have to keep re&re'ing the tire. That's where Doofus' idea of finding another rim would be good.

james · 01-15-09, 02:32 PM

Great idea, metrompg. We need one of these because we are off the grid, and have to use a generator from time to time this time of year. I would love to make one that is belt driven. I had a light that hooked up to the wheel of a bicycle when I lived in B.C. and I found that it sapped an amazing amount of power. you should use it to charge the battery in your metro and then run alternatorless.

MetroMPG · 01-15-09, 05:23 PM

Hey James - off the grid! Nice. You should post up your details.

You're right: it's not going to make a lot of power. Even if I can squeeze 10 amps @ 14 volts out of it (the output of a common car battery charger), it would take forever to completely charge a car battery. Which means I'll only be putting light loads on that battery.

If I ran my laptop from it all day (it pulls about 25 watts, and it's in use for about 10 hours a day on average), I'd then have to ride the bike for about two or 3 hours to replace that energy.

MetroMPG · 01-15-09, 05:38 PM

I wanted the uprights to contact the frame at two points on each side: lower chain stays, and the seat stays.

So I started by putting the bike on a sheet of paper and laying the boards against the bike to find the right width/angles at the base, which I traced out. As a result, the uprights have both negative toe-in and negative camber, to use some car terms:

To keep the thing from collapsing over sideways, I needed to buttress the uprights from the wide base. Triangulate! I checked to see how high I could attach the brace with some string (to make sure my heel cleared it when pedaling):

The chainstays rest in these cradles attached to the inside of the uprights:

Here's the finished stand, from above. Fore/aft stability is provided by that piece screwed to the base that runs underneath and inline with the tire. You can also really see the "toe-in" adjustment in this pic:

It's not quite as strong in the "fore / aft" plane - no triangulation. But it doesn't feel like it needs it. I can add something if need be (I'd like to watch someone else riding it).

And from the rear:

Whole thing took a couple of hours tops, to make, and seems to support the bike solidly with the rear tire about 2 cm off the base.

MetroMPG · 01-15-09, 05:47 PM

I liked Tim's drawing, so I basically did what he suggested:

Truth be told, I hadn't considered the idea of the hinge. But it's really useful for 2 reasons:

1) can easily swing the motor away from the stand and down to lift the bike out when it's time to be a bicycle again.

and, 2) the pivot means I can adjust the pressure against the tire via the bungee cord:

And here's the view of the motor hub contacting the smooth side of the tire:

01-15-09, 10:59 AM	#2
MetroMPG Infrequent noob Join Date: Aug 2008 Location: 1000 Islands region, Ontario, Canada Posts: 402 Thanks: 37 Thanked 20 Times in 19 Posts	Am I going to melt this little motor/generator? A couple of people have expressed doubt about the suitability of my little motor/generator. I have to admit, I decided to use it based on a W.A.G. of its specs. Am I'm going to burn it out? I just tested the blower in my car (it's the same size motor I pulled from the older - same - car). On the highest setting, it pulled 9.1 amps @ 12.5 volts or 113.75 watts (car not running). That's great, since that must be its continuous "rating". How does that measure against the amount of power I can transmit through it? Well, based solely on remembering the readouts on the stationary bikes at the Y, 100 watts is a light-moderate amount of effort. Sustain that long enough and you'll break a sweat. Of course it's possible to put out peaks of much more than 100w, but I'm not going to be riding this thing for long periods or doing sprints on it. So I'm thinking it's going to be just fine. __________________ . To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

12-08-11, 10:56 AM	#4
palisades EAST Lurking Renovator Join Date: Dec 2011 Location: Los Angeles Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Our bike generator.... Hi, we are 3 students at palisades charter high school in Los Angeles California...in our elective class called E.A.S.T., we work on projects that benefit the community and environment. so we saw your generator model and we made our own version (see pictures attached). We ran into two problems along the way: 1. the bike couldn't pedal because the kickstand was in the way...we were wondering how your bike worked if it had a kickstand at all 2. how to put on the generator (some instructions from your model would really help)...we used the alternator/generator model: MY1016 24 Volt 250 Watt Motor with 5M Belt Sprocket please respond as soon as possible and feel free to give us any new projects that you have

01-15-09, 12:30 PM	#6
MetroMPG Infrequent noob Join Date: Aug 2008 Location: 1000 Islands region, Ontario, Canada Posts: 402 Thanks: 37 Thanked 20 Times in 19 Posts	That's funny: I took apart my dad's exercise bike over Christmas. (Was mulling over this project, and wanted to see how it worked.) Same deal with the friction belt on what amounted to a chain-driven flywheel. The belt/rim idea works, but then it complicates using the bike as a bike if I have to keep re&re'ing the tire. That's where Doofus' idea of finding another rim would be good. __________________ . To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

01-15-09, 05:23 PM	#8
MetroMPG Infrequent noob Join Date: Aug 2008 Location: 1000 Islands region, Ontario, Canada Posts: 402 Thanks: 37 Thanked 20 Times in 19 Posts	Hey James - off the grid! Nice. You should post up your details. You're right: it's not going to make a lot of power. Even if I can squeeze 10 amps @ 14 volts out of it (the output of a common car battery charger), it would take forever to completely charge a car battery. Which means I'll only be putting light loads on that battery. If I ran my laptop from it all day (it pulls about 25 watts, and it's in use for about 10 hours a day on average), I'd then have to ride the bike for about two or 3 hours to replace that energy. __________________ . To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

01-15-09, 05:38 PM	#9
MetroMPG Infrequent noob Join Date: Aug 2008 Location: 1000 Islands region, Ontario, Canada Posts: 402 Thanks: 37 Thanked 20 Times in 19 Posts	Here's how I made the bike stand I wanted the uprights to contact the frame at two points on each side: lower chain stays, and the seat stays. So I started by putting the bike on a sheet of paper and laying the boards against the bike to find the right width/angles at the base, which I traced out. As a result, the uprights have both negative toe-in and negative camber, to use some car terms: To keep the thing from collapsing over sideways, I needed to buttress the uprights from the wide base. Triangulate! I checked to see how high I could attach the brace with some string (to make sure my heel cleared it when pedaling): The chainstays rest in these cradles attached to the inside of the uprights: Here's the finished stand, from above. Fore/aft stability is provided by that piece screwed to the base that runs underneath and inline with the tire. You can also really see the "toe-in" adjustment in this pic: It's not quite as strong in the "fore / aft" plane - no triangulation. But it doesn't feel like it needs it. I can add something if need be (I'd like to watch someone else riding it). And from the rear: Whole thing took a couple of hours tops, to make, and seems to support the bike solidly with the rear tire about 2 cm off the base. __________________ . To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

01-15-09, 11:57 AM	#3
Tony Raine Helper EcoRenovator Join Date: Sep 2008 Posts: 57 Thanks: 0 Thanked 0 Times in 0 Posts	cool idea! heres a thought though. belt drive. take the tire off the rim, and run a belt to the motor. the shape of the rim should keep the belt in place. an old v-belt (or maybe even a serpentine) should work. i once took the cover off my elliptical machine to see how it worked. resistance was increased by tightening a belt around the "wheel" in the back. now you got me thinking........

01-15-09, 02:32 PM	#7
james Lurking Renovator Join Date: Jan 2009 Posts: 19 Thanks: 0 Thanked 0 Times in 0 Posts	Great idea, metrompg. We need one of these because we are off the grid, and have to use a generator from time to time this time of year. I would love to make one that is belt driven. I had a light that hooked up to the wheel of a bicycle when I lived in B.C. and I found that it sapped an amazing amount of power. you should use it to charge the battery in your metro and then run alternatorless.

01-15-09, 05:47 PM	#10
MetroMPG Infrequent noob Join Date: Aug 2008 Location: 1000 Islands region, Ontario, Canada Posts: 402 Thanks: 37 Thanked 20 Times in 19 Posts	Attached the motor to the stand... I liked Tim's drawing, so I basically did what he suggested: Truth be told, I hadn't considered the idea of the hinge. But it's really useful for 2 reasons: 1) can easily swing the motor away from the stand and down to lift the bike out when it's time to be a bicycle again. and, 2) the pivot means I can adjust the pressure against the tire via the bungee cord: And here's the view of the motor hub contacting the smooth side of the tire: __________________ . To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.