Credit: By Todd Degler, Product Manager, Eaton Hydraulic Motors
The speed and torque requirements of the application will determine the size of motor. This will point users into what displacement (how much fluid is needed to turn one revolution) is needed. Speed and torque can be determined with the following basic motor equations. These are the starting points for finding the properly sized motor.
Theoretical torque (in.-lbs) = in.3/rev x pressure differential/(2Pi)
Theoretical speed (rpm) = gpm x 231 / in.3/rev
Gerotor & Geroler Motors
Choosing a Gerotor Motor Cheat Sheet (DRAFT) by [deleted]
Considerations choosing Gerotor motors