Hi All,
I am a mechanical design engineer by profession but have recently taken an interest in combat robotics, where my electrical expertise is at a novice level at best.
I have started to do some sums based on using two "S28-400 Magmotors" to drive a 4wd robot (One motor per side of the robot). I am slightly confused about the current usage of the motor when stalled. The spec sheet says that this motor has a 26N.m stall torque, and that the stall current can be as much as 570 Amps, which is very high, so i will use a gear reduction of 12:1 to which will give me a maximum tractive force of 3.5 times the normal force of the robot. So hopefully the robot will wheel spin before ever reaching its stall torque and frying my electrics.
In short i just wanted to ask for some advice as to how i can limit this 570 stall current and how i can determine whether the robot will wheel spin before reaching this peak current.
I could fuse the circuit to ensure the speed controller (probably a Vantec RDFR) does not see current levels higher than its max stated 220 amps, but i also dont want to run the risk of blowing the fuse in combat and being a sitting duck for my opponent. |But i also want to have lots of torque so that i can push the other robots about.
I hope that all makes sense?
What would you suggest?
Cheers,
Mech King
I am a mechanical design engineer by profession but have recently taken an interest in combat robotics, where my electrical expertise is at a novice level at best.
I have started to do some sums based on using two "S28-400 Magmotors" to drive a 4wd robot (One motor per side of the robot). I am slightly confused about the current usage of the motor when stalled. The spec sheet says that this motor has a 26N.m stall torque, and that the stall current can be as much as 570 Amps, which is very high, so i will use a gear reduction of 12:1 to which will give me a maximum tractive force of 3.5 times the normal force of the robot. So hopefully the robot will wheel spin before ever reaching its stall torque and frying my electrics.
In short i just wanted to ask for some advice as to how i can limit this 570 stall current and how i can determine whether the robot will wheel spin before reaching this peak current.
I could fuse the circuit to ensure the speed controller (probably a Vantec RDFR) does not see current levels higher than its max stated 220 amps, but i also dont want to run the risk of blowing the fuse in combat and being a sitting duck for my opponent. |But i also want to have lots of torque so that i can push the other robots about.
I hope that all makes sense?
What would you suggest?
Cheers,
Mech King