Patent ID: 7482716
Filing Date: 2009-01-27
Classification: H02K

Abstract:
1. A linear motor comprising: a permanent magnet row unit including: a plurality of permanent magnet rows each formed of a row of a plurality of permanent magnets; and a support for supporting said permanent magnet rows in a state where said permanent magnet rows are arranged in parallel, said permanent magnets constituting said permanent magnet row being magnetized so that magnetic poles of each of said permanent magnets appear on both sides thereof, which oppose each other in a direction in which said permanent magnet row are arranged, and so that different polarities of magnetic poles appear alternatively in the direction in which said permanent magnet row extends; and an armature unit including a plurality of coil units respectively provided corresponding to said permanent magnet rows, said armature unit being set with said permanent magnet row unit; each of said coil units of said armature unit including a coil made of annularly wound winding conductor and first and second claw pole type yoke units arranged at the coil, the first and second claw pole type yoke units being structured to be arranged on the coil so that a main portion of an internal space of each of said coil units is formed between the first claw pole type yoke unit and the second claw pole type yoke unit; the coil including a pair of linear portions extending linearly and facing each other with the main portion of the internal space therebetween and a pair of coupling portions coupling the pair of linear portions; the first and second claw pole type yoke units being arranged at the pair of linear portions of the coil, respectively, so that a corresponding one of the pair of linear portions extends through each of the first and second claw pole type yoke unit; each of the first and second claw pole type yoke units including first pole teeth, second pole teeth, and a yoke magnetically coupling the first pole teeth to the second pole teeth, the first pole teeth extending in one direction proceeding from said armature unit to said permanent magnet row unit and being arranged to form a row along the corresponding linear portion, the second pole teeth extending in the other direction opposite to the one direction and being arranged to form a row along the corresponding linear portion; the first and second claw pole type yoke units being arranged relative to the pair of linear portions of the coil, respectively, so that the first pole teeth of the first claw pole type yoke unit face the second pole teeth of the second claw pole type yoke unit and so that the second pole teeth of the first claw pole type yoke unit face the first pole teeth of the second claw pole type yoke unit; each of said permanent magnet rows being interposed between the first claw pole type yoke unit and the second claw pole type yoke unit of a corresponding one of said coil units so that the both sides of said each of said permanent magnet rows face the first and second pole teeth of the first claw pole type unit and the second claw pole type yoke unit, respectively; and one of said permanent magnet row unit and said armature unit constituting a movable element and the other of said permanent magnet row unit and said armature unit constituting a stator.