Patent ID: 8093766

Claim:
A cylindrical linear motor comprising: an armature formed by a plurality of cylindrical coils arranged in an axial direction inside a cylindrical yoke formed by a magnetic material and a frame covering the outside of the cylindrical yoke, and a field pole which is coaxially arranged in a hollow space of the armature via a magnetic gap, as well as formed by a plurality of cylindrical columnar magnets magnetized in an axial direction arranged inside a stainless steel pipe with the same magnetic N or S poles facing each other, and end blocks are arranged at both ends of the stainless steel pipe, wherein the field pole and armature move relatively, the frame is formed by a resin material whose electric conductivity is nearly zero, and the end block is formed by an end block mounted with either a bolt or a pin which is forced in an array direction of a magnetic pole, the bolt or pin pressing the cylindrical columnar magnets to attain close contact between the cylindrical columnar magnets in the array direction.