Pages: [1]   Go Down
Author Topic: Suggestions on where to buy a high torque 12v DC motor  (Read 3165 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 46
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi guys,
I bought one of these: http://www.pololu.com/catalog/product/1107
but, it doesn't have enough power/torque for by project.
I need a motor that can turn about 100 lbs. at around 4-6 rpms under load.
Does anyone have any suggestions on where I can buy a motor that can do this without breaking the bank?

Logged

USA
Offline Offline
God Member
*****
Karma: 14
Posts: 644
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Perhaps this site might have what you are looking for.  They are a surplus store that specializes in various sized motors, pumps, pneumatics, etc...
Logged

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 545
Posts: 27357
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Might look here too to see if anything meets your torque/budget needs
http://www.mpja.com/DC-Motors/products/100/
Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

Offline Offline
Newbie
*
Karma: 0
Posts: 46
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

thx for the suggestions guys.
Logged

USA
Offline Offline
God Member
*****
Karma: 14
Posts: 644
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

While looking at the site of another surplus store I often patronize, I found this 12 VDC car seat motor on sale for $12.50.  They don't mention a torque rating, but given it's intended use and the fact that you'll have to down gear anyway (the shaft goes 190 RPM), it should be able to move over 100 lbs easily.
Logged

0
Offline Offline
Shannon Member
****
Karma: 215
Posts: 12467
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I need a motor that can turn about 100 lbs. at around 4-6 rpms under load.

100lbs is meaningless in this context - for a motor you need torque (turning force) measured in Nm (or sometimes ft-lbs).
Torque requirement is easy to assess for a winch since you multiply the pull-force by the radius of the cable-drum to get the torque on the shaft.

For a vehicle its harder to know the torque without knowing more about transmission, terrain, slope, tyres...

For simply turning a heavy wheel on a bearing you need to know friction losses, but you may need a lot of torque to accelerate the wheel to speed fast enough (and then braking torque to stop it).  Torque here is angular-acceleration times moment-of-inertia (plus any friction losses).  Moment of inertia is proportional to mass and proportional to radius _squared_.

[ You meant RPM - its already plural "revolutions per minute" smiley-wink ]
Logged

[ I won't respond to messages, use the forum please ]

Pages: [1]   Go Up
Jump to: