The invention relates to an improved process for inserting a magnetized rotor shaft (403) into a stator core (406) of a permanent magnet generator (PMGs), comprising the steps of inserting a plurality of high energy magnets into the rotor shaft (403), the quantity and size of the magnets-being optimized depending on the capacity of the PMG; providing a screw jack shaft device having a pair of jack threaded shafts (405), a pointed rod member (407) attachable to the rotor shafts (403), a jack shaft holder (404) fixable to a base, and at least two end shields (408) each provided with a step, a stator core (406) for insertably accommodating the magnetized rotor shaft (403); wherein the pair of screw jack threaded shaft (405) is aligned on each side of the rotor shaft (403) and rotated by the pointed rod member (407) to advance the rotor into the stator core, wherein the bearing assembly of the PMG upon advancement of the rotor towards the stator core rest on the step of a first of said at least two end shields which is fixed on the stator frame, and wherein a second end shield at the opposite end is fixed to the stator frame after maintaining an uniform gap.
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