Patent ID: 7911095

Claim:
A servo motor with large rotor inertia, comprising: a casing comprising a hollow chamber and axial stages at front side and rear side thereof; a stator arranged in the chamber and comprising a ring and a plurality of coils around the ring, a through hole being defined at the center of the ring; a rotor comprising a rotation shaft and a magnetic body capped to the rotation shaft, wherein both ends of the rotation shaft are fixed to the axial stages such that the magnetic body is arranged in the through hole, an end of the rotation shaft extending out of the casing for connecting with a load; and only an inertia disk directly fixed to the rotation shaft of the rotor, wherein the inertia disk is located at another end of the rotation shaft, the inertia disk, being rotatable dependently with respect to the rotation shaft, is rotated to increase rotation inertia of the rotor when the stator is magnetized to rotate the rotor, as such the inertia disk with different radius and thickness can be provided to the server motor with same output power and an amount of inertia increment provided by the inertia disk depends on inertia required to match with the load.