I’m thinking about building a robot just with some old parts I have.
The main thing is the motors. I have 2 DC Motors
Specs below. (It’s a MFA975D Series with gear ratio 49:1)
Operation range(Voltage): 12V
No load – Speed 147RPM
Nm = 1,8
The tracks of the robot will be caterpillar from old tires, driven by chains onto a gear.
My robot might gonna weight approx 40kg
How do i calculate of the motors are strong enough and what speed would I be travelling in? Only horizontal no degrees inclined.
EDIT
Thanks for helping me with my issues guy, i appreciate it a lot! The 2 motors have to run in a controlled loop. So when I want to go forward both motors go forward, and same as backwards. When I wanna turn, the motors gonna work in opposite direction of each other.
The things I want to know is , could it be possible to even use that motor standard, or should it need to be gear lower, for more torque? And how I’m calculating the speed of a my machine with this motor, my weight, the friction (Rubber vs Asphalt).
Best Answer
I would say you would go by trial and error, since there are factors like how the weight is distributed on the motors, will each motor run independently or will you have a closed control loop?
As @tlfong01 said in the comments, you need to know your torque. Higher torque = bigger force of the motor but slower speed.
And as @Andy aka said, you also need to know your frictions.
Technically, any motor can lift/drag any weight, if it has enough torque, but it will be really slow