Iron losses due to armature field of permanent magnet brushless machine in DC motor and AC generator

The armature field for permanent magnet brushless (PMBL) machine working as DC motor is different from that as AC machine, which causes that the iron losses of PMBL DC motor are not equal with those of PMBL AC machine. An experimental system is designed to separate the iron losses due to armature field from other losses for PMBL DC motor and AC generator. The analysis results of the test data for the prototype PMBL machine of 30kW show that the iron losses due to armature field for the prototype as the DC motor are much more than that as the AC generator, and the iron losses due to armature field in rotor for the PMBL DC motor is more than that for the PMBL AC generator.