Which motors do i need?

Community General Discussions
1

Hello,

I was looking for a new challenge in building robots.

The new robot is 100 kg and needs 4 motors. I am a quite noob with motors. 

i used this website to calculate the torque needed for the motors

https://www.robotshop.com/blog/en/drive-motor-sizing-tool-9698

but the problem was that the outcome was that I need 4 motors of 30 Nm. I think that is very much and i can't find motors of 30 Nm

can anyone help me with this problem?

 

Thanks a lot

2

Motor Sizing

Did you adjust the speed and incline? 100kg at 2m/s up a 20 degree incline will require a big motor.

3

The speed has no influence

The speed has no influence on the torque.

Oh yes that’s the clue, i didn’t change the incline.

Then i need something with 10 Nm. But it is still a lot i think?

4

i can better avoid incline’s

i can better avoid incline’s i think hahaha

5

I found one i

I found one i think

http://robokitsworld.com/motors/high-torque-dc-geared-motor-300rpm

but can someone explain the difference between stall and rated torque? because the rated torque is too low 

and i want to connect the motors to a 11.1 V lipo battery, is this a big problem?

6

Wheels

Another factor in the equation is the wheel. What diameter, support mechanism, and drive connection to motor?

7

I avoid inclines so it is

I avoid inclines so it is 1.5Nm and then is 30kg cm more than oke. 

8

Motors

In your pursuit of hefty motors, don’t overlook used resources like power chairs, (electric wheel chairs), power seat motors, screw jacks, (from old satellite dishes & RV’s), and rechargable drills.

In many cases these can be obtained for free, (or nearly so), and would more than meet your requirements. For example, the motors in my robot, “Jazzy”, are from a Pride Mobility Jazzy model power chair that easily moves a 300lb person around while drawing less than 6 amps.

https://www.robotshop.com/letsmakerobots/user/4388/pages/robot

 

 

9

Well, if your motor could

Well, if your motor could deliver 30 kg/cm continuous then yes.

But the motor you found has a stall torque of 30 kg/cm which is more like 5/6 kg/cm continuous.

 

About avoiding inclines, i’d suggest you take your motor a bit stronger to be on the safe side.

A 1 degree incline is NOT much, basically the floor in your house/appartment could be 1 degree off from perfect level and then you wouldnt even be able to drive it around at home. 1 degree requires 2.8Nm or 28.55Kg/cm torque!