Patent ID: 8330307
Filing Date: 2012-12-11
Classification: H02K

Abstract:
1. A linear motor including two permanent magnet rows each of which consists of a plurality of permanent magnets fixed on an elongate yoke such that polarities of the permanent magnets alternately change and which are opposed to each other, and an armature including a plurality of cores and a, plurality of coils wound on the respective cores, wherein the armature is disposed between the two permanent magnet rows such that the cores of the armature opposes to the two permanent magnet rows in a first direction perpendicular to each of the two permanent magnet rows, and the armature is moved relative to the two permanent magnet rows along a straight line by application of an electric current to the coils, wherein an improvement comprises: each of the plurality of cores extending in the first direction, and the plurality of cores being arranged in a second direction parallel to the straight line and perpendicular to the first direction, the plurality of coils being disposed on the plurality of cores such that the coils on the cores adjacent to each other in the second direction are arranged in a zigzag pattern and are spaced apart from each other in the first direction, with a gap left therebetween in the first direction, wherein the armature further includes a heat pipe having opposite end portions wherein one of which is inserted in the gap and the other of which extends outwardly of the gap, the armature further including a plurality of fins fixed to the above-indicated other of the opposite end portions of the heat pipe, wherein the plurality of cores are provided by a plurality of mutually independent core blocks, and the armature further includes a fixing device by which the plurality of mutually independent core blocks are fixed to each other, and wherein the fixing device includes (a) two beam members disposed on respective end faces of the core blocks that are opposed in a third direction perpendicular to the first and second directions, and (b) fastening members which force the two beam members against the respective end faces of the mutually independent core blocks, for fixing the core blocks together.