Patent ID: 6661130
Filing Date: 2003-12-09
Classification: H02K

Abstract:
A linear motor having a stationary member and a moving member located so as to face each other and so as to move said moving member along said stationary member, making use of a force generated between a magnet and an armature, said linear motor comprising:said stationary member having a slender shape; said moving member having a cylindrical shape and being fitted on said stationary member with clearance permitting movement relative to the stationary member; said armature being located on a side of the moving member and said magnet being located on a side of the stationary member, wherein said magnet comprises at least one row of magnet poles disposed along a longitudinal direction of the stationary member, and said armature comprises at least two rows of armature poles that are adjacent to one another, the armature poles being disposed along the longitudinal direction for interaction with the magnet poles; a first air flow path for cooling being formed to extend along said row of magnet poles on the side of the stationary member; a further air flow path for cooling being defined between said at least two rows of armature poles that are adjacent to one another; wherein said first air flow path for cooling is supplied with air flow by a first air supply means that introduces the air flow into said first air flow path for cooling, and wherein said air flow passes through the further air flow path so as to cool said armature located on the side of the moving member.