Motor faults are among the most difficult one to detect online due to the fact there are no centrifugal forces (which tend to move components) also thermal expansion plays important role as components tend to expand when they heat up so again online fault may not be detectable offline. Rotor flux monitoring system for synchronous motors monitors each pole magnetic flux as the pole passes the permanently installed flux probe and compares signals obtained from each pole for early detection of rotor windings shorted turns and ground faults.