1. The problem statement, all variables and given/known data I have a motor with WK^2 = 4 lb-ft turning at 5400 RPM (3 * base speed) and I want to slow it to 1530 RPM (.85 * base speed). The motor is a 25HP 4 pole with a base speed of 1800 RPM. How much electrical energy must I absorb? 2. Relevant equations 3. The attempt at a solution I have calculated the kinetic energy of the motor @ 5400 RPM and 1530 RPM using Ke = 1/2 * Inertia * omega^2 and found the total Rotational energy lost. For Ke @ 5400 RPM I have calculated 3067 J and @1530 RPM I have calculated 869 J for a difference of 2197 J.