Patent ID: 9490686
Filing Date: 2016-11-08
CPC Classification: H02K

Claim Text:
1. A linear motor comprising: a magnetic field part having a plurality of permanent magnets arranged in a straight line in such a manner that N poles and S poles are formed alternately; and an armature having a core which has a plurality of teeth arranged opposite to the magnetic field part with a gap created therebetween and U-phase, V-phase and W-phase coils wound on the plurality of teeth of the core, the armature linearly moving relative to the magnetic field part, wherein among the plurality of teeth with the U-phase, V-phase and W-phase coils of 120-degree different phases from each other directly wound around, a width in a relative moving direction of each of teeth placed at both ends in the relative moving direction is smaller, from a base part to an end part thereof, than a width in the relative moving direction of each of other teeth, wherein the coils of 120-degree phase difference are directly wound around the teeth placed at both ends, wherein the number of the plurality of teeth is set to be a multiple of three, the plurality of teeth including the teeth placed at the both ends and the other teeth, and the plurality of teeth being directly wound by the U-phase, V-phase and W-phase coils, and wherein all distances from centers of each of the plurality of teeth with the U-phase, V-phase and W-phase coils directly wound around to centers of respective adjacent teeth in the relative moving direction of the armature are equal to each other.