Motor Power Calculations

[Ether]

Originally Posted by DMetalKong

I was hoping some more experienced heads could verify if what I am doing in correct.

Whether or not it is correct depends on what your design goal was, but you didn't say... so it's not clear (to me) why you used the free speed in your final calculation.

I know there is the JVN design calculator, but as far as I can tell it doesn't work well trying to mix and match motors in a single drivetrain.

As a first approximation, when you combine two motors, you generally want to gear down the faster one to match the slower one's speed, so that each motor is always operating at the same % of its own free speed. So gear down the RS550 19300/5310 = 3.63:1 (as you said).

You can then take that motor combination, and calculate an approximate effective motor curve for the combination, and then treat it as a single motor for purposes of further calculation using JVN's calculator.

If you want to factor in the efficiency of the 3.63:1 gearing it gets a little more complicated, but still doable.