Patent ID: 7847579

Claim:
A method for evaluating a permanent magnet motor, wherein the rotor is rototably mounted in proximity to a stator with windings such that the rotating rotor induces a voltage in the windings of the stator, the method comprising the steps of: spinning a rotor of the permanent magnet motor at an end-of-line motor test or an end-of-line transmission manufacturing test; determining a total harmonic distortion of the permanent magnet motor at the windings, wherein the determining step includes calculating the total harmonic distortion (THD) from the equation THD = V 2 2 + V 3 2 + V 4 2 + ⋯ + V n 2 V 1 where V n refers to the voltage of harmonic n; and comparing the determined total harmonic distortion of the permanent magnet motor with a baseline total harmonic distortion.