[Oblarg]

Originally Posted by Ether

Here's a very simple spreadsheet for a drivetrain with one CIM per wheel.

User inputs:

Cell A1 is the (lossless) vehicle free speed in feet/sec at the CIM's free speed of 5310 RPM.

Cell A2 is CIM current.

Cell A3 is the estimated drivetrain torque efficiency.

Output:

Cell A5 is the available motive pushing force at each wheel in lbf. Compare this to the weight on the wheel times the static coefficient of friction of the wheel to determine if the vehicle is traction limited or torque limited for the given current.

Anyone here have any data on the amount of internal frictional losses FRC drives actually have? I've always wondered about this, but never really gotten around to testing it. Just wondering how accurate the 80% efficiency figure in the spreadsheet actually is/