hi i was wondering what would be a good motor for me to get that can pull up to 10 pounds that is compatible with arduino??
thanks
No motor's really compatible: you always need something in between, maybe just a transistor, but often an h-bridge. In either case, you control the motor with a signal from an IO pin through the intermediary. The transistor or the h-bridge is the part that needs to be compatible.
Also, motors aren't measured in force- they exert a torque: force at a distance. And gearing always helps... 8)
ok great thank you but what do i need to be able to have a motor that pulls 10 pounds?? what exactly do i need??
i am trying to make a robot that needs to be able to drive (slowly is fine) that will be able to pull 10 pounds
pull 10 lbs ?! Lift at what speed? AC or DC ??
The Arduino can control any motor. It only needs the proper interfacing devices..
i am trying to make a robot that needs to be able to drive (slowly is fine) that will be able to pull 10 pounds
You need to research elementary mechanics... gearing and so on.
The size of the wheels makes a difference for example. A motor of given torque with a small diameter wheel will exert a greater force than the same motor with a huge wheel.
If you need to exert a pull of 10lbf, that's the force you need at the circumference of the wheel. If you have a wheel of say 1" radius, that's a torque of 10 lbf.in. Halve that if you have two independently powered wheels each taking half the load.
EDIT: This might help.... note what they say about start-up torque.
Once you find a motor of the required mechanical characteristics, you then look at its electrical characteristics and choose a driver- an h-bridge maybe- that meets those needs. Then you figure out how to interface that to the Arduino.
ok great thank you so much! but my problem is finding the things that i need i can't find them online. and also i need to pull 20 pounds so i am going to use two motor. thanks
Don't forget the mass of the motors and the chassis and so on.....
where would be a good place to get these things and what do i need to get
sorry i am just a beginner with these things
There seem to be two threads on this problem - its unhelpful to split a thread like this,
no idea which one to respond to. Mark one as "solved" or something?
it is all the sam equestion
dtotino:
it is all the sam equestion
Again, in order to answer your question properly (without purchasing a motor too small, or too big - while too big is always ok, you may over pay for something you won't use), you are going to need to understand the mechanics of the situation.
MarkT can give you some pointers about torque equations and such; that said, I have found this book to be a complete and in-depth treatise on the subject:
Even brand new, it's quite a book for a low price.
Using Google and Youtube searches, find a robot similar to what you want to build, then post the link. Your 10 pound requirement may be a bit confusing. Do you want the bot to develop a 10 lb pulling force, or pull something weighing 10 lb that may be on a cart or similar.
i would like it to pull something that weighs 10 pounds
the 12V motor , 30 rpm, 120N/cm is capable to lift 5 lbs aprox. 2 inch/sec verically.
This is aprox 10W at max.
calculate yourself.
You know that 12V 80A (1000W) can lift 150 lbs 1m/s (loss in motor 25%)
What lifting speed do you need?
Guess that small motors are no more than 50-60% efficient
ok great thank you do youi think that this will work??
http://www.amazon.com/Amico-0-33A-600RPM-3-2Kg-cm-Torque/dp/B0087ZUGZY/ref=sr_1_29?ie=UTF8&qid=1389662434&sr=8-29&keywords=amico+dc+motors
Please don't double post.
It's not possible to answer your question about that motor without knowing the torque you need as others have tried to explain.
A simple way to get a rough idea is to make up your trailer (or a reasonable mock up) and pull it with a strong thread (or fine string) running over a pulley at the edge of a table. Hang different weights from the string until you know how much force it takes to move the trailer. A convenient weight might be an empty 2 litre coke bottle adding water to it gradually. 2 litres weighs 2Kg for all practical purposes.
The link to your motor specifies it's torque as 3.2Kg.cm so you should then have all the data you need to calculate an answer to your question. Allow a large margin (50% ?) for errors - better to buy a motor that is too big than too small.
...R
dtotino:
i would like it to pull something that weighs 10 pounds
Do you want to pull it up, or sideways ? Lifting something vertically is a different problem to dragging something along the ground, which is also a different problem to dragging it along the ground on some kind of little cart, or other wheeled device.
On a suitable surface, and with the tyres properly inflated ( and the handbrake off ), I can push a 2500 pound car. I certainly can't lift it off the ground.
michinyon:
On a suitable surface, and with the tyres properly inflated ( and the handbrake off ), I can push a 2500 pound car. I certainly can't lift it off the ground.
That's certainly true - but you got to get it rolling, first; it takes a bit of force to get it rolling first (static friction) vs keeping it rolling (kinetic friction).
Something else I attempted to explain in the OP's other thread was that he was going to find that most motors online were going to be referenced in what I referred to as "bubba-units" (ie - kg-cm, lb-in, etc) - and not SI units (newton-meters). You typically only see such units used on motors being sold to FIRST competitors (and sometimes in the datasheets of motors). That said, one can convert for "bubba-units" to SI units fairly easily (or vice-versa for purchasing decisions).
But - as we keep telling the OP - the torque needed has to be calculated first, if you want to make any headway starting from scratch...not sure if this has sunk in, yet.