This paper deals with a permanent magnet synchronous generator (PMSG) for diesel engine generators. Generally,
a silicon steel sheet is used to minimize eddy current losses of the stator and rotor cores of a generator.
However when a silicon steel sheet is employed to produce the core of the stator and rotor, manufacturing costs
increase due to the high cost of the silicon steel sheet. To reduce these costs, a 5 mm SSC400 rolled steel can be
used as an alternative to the silicon steel sheet. However, the SS400 rolled steel with a thickness of 5 mm can
increase the eddy current losses of the core. In this paper, in order to overcome this problem, a slit type rotor
core is employed. In this case, eddy current losses can be reduced, resulting in improved THD (Total Harmonics
Distortion) of the induced EMF (Electro-Motive Force). The eddy current losses and THD of the induced
EMF according to the number of slits is also analyzed. Moreover, a prototype is produced for the final model,
and the effectiveness is confirmed through experiments.