Patent ID: 6977450

Claim:
A linear motor comprising: a rod-like member having a cylindrical body made of a non-magnetic material and a plurality of plate-like segment magnets accommodated in the cylindrical body such that they are stacked in a longitudinal axial direction of the cylindrical body; and a coil member having a polyphase coil, wherein said rod-like member is arranged to extend through a center bore of said coil member, and said rod-like member and said coil member are moved relative to each other by applying a current to the polyphase coil of said coil member, said linear motor being characterized in that said rod-like member comprises the cylindrical body having a substantially oval or substantially rectangular cross section and the plurality of segment magnets having a substantially oval or substantially rectangular plate shape which are accommodated in the cylindrical body and stacked in the axial direction of the cylindrical body, and that the section of the center bore of said coil member is substantially oval or substantially rectangular corresponding to the shape of the section of said rod-like member.