1. A system comprising: a proportional-integral-derivative (PID) regulator; and a fault detection unit for: receiving at least two outputs from the PID regulator, wherein the at least two outputs comprise at least two rotor reference frame D-Q currents, determining a magnitude of an amplitude for each of the at least two rotor reference frame D-Q currents, generating a detection signal based on the at least two rotor reference frame D-Q currents, wherein the detection signal identifies a single amplitude magnitude value based on the magnitudes of the amplitudes for each of the at least two rotor reference frame D-Q currents, and identifying an existence of a permanent magnet motor fault based on a comparison between the single amplitude magnitude value and an amplitude threshold value.