Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 45 users online :: 4 registered, 0 hidden and 41 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Electric Bycicle! (Now with Video)

All non-spudgun related discussion goes here such as projects, theories, serious questions, etc. All "off-topic" posts (aka useless posting, determined by moderators) will be removed.
Sponsored 
  • Author
    Message

Unread postAuthor: Lentamentalisk » Sat Nov 01, 2008 1:09 am

well, from my experience with attaching the motor to the wheel like that, you will have to buy new tires very very very often. I would suggest directly gearing the motor to the chain, with some sort of ratchet mech like the back wheel has. That way you can get varying torque, as well as speed, by just shifting gears.
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: VH_man » Sat Nov 01, 2008 7:35 am

Lentamentalisk wrote:well, from my experience with attaching the motor to the wheel like that, you will have to buy new tires very very very often. I would suggest directly gearing the motor to the chain, with some sort of ratchet mech like the back wheel has. That way you can get varying torque, as well as speed, by just shifting gears.


I tried that, and getting the right gear ratio off of the motor would take farrrrr more money and engineering than i would like. as long as the wheel doesnt slip it doesnt cause much wear.
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: THUNDERLORD » Sat Nov 01, 2008 8:53 am

Great job making a working prototype VH_man!
Looks like a good idea to have everything mounted on the seat post because with a removable seat post, the assembly can be transported, stored or switched to a different bike easily.
BTW, I would've replied before, but I'm still out of town with very limited internet times. But I'll be moving today and getting that straightened out ASAP in my new place (As well as some new projects hopefully) :) . Sorry the wheel sprocket I suggested didn't work out. Do you plan on using it for something else or...? 8)
  • 0

-----SPEED,STRENGTH, AND ACCURACY.-----
"Procrastination" is five syllables for "Sloth".
Theopia 8)
Born To Be Alive!

THUNDERLORD
Major General
Major General
 
Posts: 1264
Joined: Fri Mar 28, 2008 1:42 pm
Reputation: 0

Unread postAuthor: VH_man » Sat Nov 01, 2008 9:16 am

If i ever get some spare cash and access to machining facilites (which i will sometime soon) i will attach a Gearbox and an Electromagnetic Clutch (from a car AC Unit) directly to the wheel with the large sprocket i have. Untill then, this is what i will stick with. It works quite well, and is actually quite small. I am suprised.....

Only further modification i will make to this will be some uprights running off the frame to help maintain a good level of friction between the wheel and roller.
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: VH_man » Sun Nov 02, 2008 10:36 am

Bump

Video has been posted on First page.
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: psycix » Sun Nov 02, 2008 11:22 am

Awesome!
Could you post detailed specs of the motor: how much amps does it draw and whats the power output?

Have you already tried different sizes of rollers? Maybe you may increase the power of it when picking another torque conversion factor.

Anyways, its a lovely help-motor to aid lazy people biking.

judgment_arms wrote:and the other for all the duck tape!

Well, it does not matter whether it is duct or electrical tape, it is surely not DUCK tape....
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: VH_man » Sun Nov 02, 2008 12:26 pm

Specs:

Nominal v: 12v
No Load RPM: 5280
Stall Current: 115A
Kt: 3 oz-in/A
Kv: 440 rpm/V
Efficiency: 74%

I just added side braces to aid in nulling the "motor falls off the wheel" problem. Works even better now, i dont loose traction when i go over bumps.

And, i will eventually buy a larger sprocket for the roller drive, as i too feel it could still use a little gearing down......... If i can find a 120 tooth one, i could even re-try my attemps at driving it directly from the wheel.....
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Sponsored

Sponsor
 


Unread postAuthor: john bunsenburner » Sun Nov 02, 2008 2:29 pm

1. wer did u get the motor
2. i got a small question which is some what off topic: i have a shake table made from a piece of woad mounte on two copper tubes that fit into each other not i want this manual shake table to be electric could you help me seeing that you are working with motors(yes this is a school project!)
  • 0

User avatar
john bunsenburner
Major General
Major General
 
Posts: 1446
Joined: Sun Oct 19, 2008 5:13 am
Reputation: 0

Unread postAuthor: VH_man » Sun Nov 02, 2008 3:23 pm

The motor is a CIM motor. its a 25 dollar motor that is relatively hard to come by at this time of year (FIRST season) but its relatively easy to find one on some robotics sites. just type in CIM motor. Youll find it. I got my motor for free... :-D

2. I dont know what your talking about.... Rephrase it?
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: littlebro05 » Sun Nov 02, 2008 3:30 pm

Rofl awesome bike!!!

Didn't sound like it was having any trouble but i'd assume like you said before it will probably overheat after a couple of minutes.

You know what you could do! Buy a one gear BMX bike, then get a longer chain for your motor and stick it on the back wheel of your bike where the other chain is. I'd imagine that the rubber wouldn't wear out at all XD.
  • 0

It's Nerf or Nothing.

Don't start crying when I play this as my hobby, Paintball, Airsoft and Nerf are equally good hobbies, except you can play Nerf in public. Good day! Hmph!
User avatar
littlebro05
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 417
Joined: Wed Oct 17, 2007 5:04 am
Reputation: 1

Unread postAuthor: VH_man » Sun Nov 02, 2008 3:37 pm

Actually, I did some testing, and the "hotness" i was getting was just because its like 30 degrees out here now. the change in temperature from warm motor to cooolld air was.... a large difference.

Its really more a problem of the battery dies hella fast now. If i pedal with the motor up hills, it can actually hit its top speed and not have any problems. I just have to give it a little "boost" every once and a while.
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: littlebro05 » Sun Nov 02, 2008 3:57 pm

Hmm you know what, I feel like going to a hobby store and find a decent sized motor or some sort of store to make my own easy pedal thing XD. I'd assume it's not water proof though :(?
  • 0

It's Nerf or Nothing.

Don't start crying when I play this as my hobby, Paintball, Airsoft and Nerf are equally good hobbies, except you can play Nerf in public. Good day! Hmph!
User avatar
littlebro05
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 417
Joined: Wed Oct 17, 2007 5:04 am
Reputation: 1

Unread postAuthor: starman » Sun Nov 02, 2008 4:08 pm

Just saw the video...looks solid enough. It would be nice if you could get a little more speed though. That's a really creeping pace for road travel.

I like your idea of retoothing your gears for a little more speed.
  • 0

Last edited by starman on Sun Nov 02, 2008 4:10 pm, edited 1 time in total.
User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: VH_man » Sun Nov 02, 2008 4:10 pm

Id need a new motor, which is a possibility. I have a 200 watt Hub motor on my Christmas list........
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: SEAKING9006 » Wed Nov 05, 2008 7:02 pm

I wish my school did FIRST. Our team competes in BEST, so we are fairly limited in our ability to build, based mainly on the stuff they give us, as well as size restrictions.

I feel that my school would completely SWEEP FIRST, because we have a full machine shop, and DAMN smart people. (Not to mention they know me by name at Fastenal.)
  • 0

Completed projects:
CA1 SMSS Basic Inline
CA3 PDAB Airburst Cannon

Current Project: Bolt action rifle (25x140mm + 1in shot)

SEAKING9006
Colonel
Colonel
 
Posts: 734
Joined: Mon Jun 23, 2008 3:20 pm
Location: Texas
Reputation: 0

PreviousNext

Return to Non-Spudgun Related Discussion

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Yahoo [Bot]

Reputation System ©'