### Author Topic: Motor for QuadCopter  (Read 2922 times)

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#### vipulan12

• Robot Overlord
• Posts: 181
##### Motor for QuadCopter
« on: October 30, 2012, 08:08:41 PM »
Hey, I am currently looking for motors useful for quad copters

-the motors needs to have high RPM, adequate torque and be extremely light weight
-the quad copter is expected to lift a camera

currently the weight of camera and other parts are unknown
I am planning to use my arduino uno for this project

any suggestions or advice would be helpful

#### Soeren

• Supreme Robot
• Posts: 4,672
• Mind Reading: 0.0
##### Re: Motor for QuadCopter
« Reply #1 on: October 31, 2012, 04:14:42 PM »
Hi,

currently the weight of camera and other parts are unknown
I am planning to use my arduino uno for this project

any suggestions or advice would be helpful
Errr... Finding the total weight is not just a good idea - it's mandatory!

You can't find the needed motor/propellor combination without knowing how much weight it have to lift.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Engineering is based on numbers - not adjectives

#### vipulan12

• Robot Overlord
• Posts: 181
##### Re: Motor for QuadCopter
« Reply #2 on: November 04, 2012, 10:05:16 PM »
so lets say i have the the weight,How would i calculate it,What formula would you use?

#### jkerns

• Robot Overlord
• Posts: 265
##### Re: Motor for QuadCopter
« Reply #3 on: November 05, 2012, 08:24:58 AM »
Obviously, the total available thrust will have to exceed the total weight, right? And you need some margin to allow some motors to be throttled back to make it turn / move.

A quick google search for "brushless DC motor propeller thrust" turns up quite a few resources such as http://adamone.rchomepage.com/guide5.htm

Of course, you have the old chicken and egg problem - you don't know how much it will weigh until you pick the motors and the batteries. But you don't know what motor / batteries to pick until you know the weight. Right?  So you guess. Pick a weight, see what motors that leads you to, check to see if you are close to your target weight, then guess again. After a few tries, you should get a workable answer.
I get paid to play with robots - can't beat that with a stick.

http://www.ltu.edu/engineering/mechanical/bachelor-science-robotics-engineering.asp

#### vipulan12

• Robot Overlord
• Posts: 181
##### Re: Motor for QuadCopter
« Reply #4 on: November 18, 2012, 06:36:39 PM »
what is the formula to calculate lift for a quadcopter?

#### waltr

• Supreme Robot
• Posts: 1,944
##### Re: Motor for QuadCopter
« Reply #5 on: November 18, 2012, 07:43:07 PM »
Did you google "propeller thrust"?
Lot and lots if info from simple calulators to complete equations on the design of propellers for quad copters.

#### vipulan12

• Robot Overlord
• Posts: 181
##### Re: Motor for QuadCopter
« Reply #6 on: November 19, 2012, 02:55:00 PM »
i did but i dont know where to start
most of these calculators are complicated and have all kinds of features

#### waltr

• Supreme Robot
• Posts: 1,944
##### Re: Motor for QuadCopter
« Reply #7 on: November 19, 2012, 03:44:30 PM »
i did but i dont know where to start
most of these calculators are complicated and have all kinds of features
Exactly.
The solution is not a simple one and is the reason I said to google and read. As with any learning you need to spend time studing.
The simplest solution is to use the exact motor-propeller combination someone else has used to successfully build a quadcopter.

#### vipulan12

• Robot Overlord
• Posts: 181