I am creating an e-motor manual for several motors in our fleet. The chart I'm trying to create is displayed as a picture on sheet3 (the chart will be capable of displaying several power sections). The formula under "Real EFF%" is one obtained from a Mud Motor Manual posted online http://www.slb.com/~/media/Files/dri...k_handbook.pdf. The formula is on page 201. This formula doesn't display the RPM curve the same as what is seen in the picture. This is what is desired. An accurate calculation of the rotor RPM as the torque/pressure differential increases.

Any help would be greatly appreciated.

Mika
MotorPowerCalcs1.xlsx