Patent ID: 8803393
Filing Date: 2014-08-12
Classification: H02K

Abstract:
1. An electrical machine comprising a stator device and a moving device, wherein the stator device is a multi-phase stator device comprising a plurality of phases arranged side-by-side in a lateral direction, perpendicular to a direction of motion of the moving device, where the stator device comprises a plurality of sets of teeth, each tooth protruding towards the moving device and comprising an interface surface facing the moving device, wherein the teeth of each set are distributed along the direction of motion, wherein the plurality of sets of teeth comprises two peripheral sets and a plurality of inner sets arranged in the lateral direction between the peripheral sets; where the teeth of the inner sets are wider, in the lateral direction, than the teeth of the peripheral sets and provide a common magnetic flux path shared by two neighbouring phases; wherein the interface surfaces of the teeth of the peripheral sets define a lateral extent of an active air gap region between the stator device and the moving device; wherein the stator device comprises at least two separate stator core sections that abut each other and share one of the plurality of phases; wherein the moving device comprises a plurality of permanent magnets separated from each other in said direction of motion by pole sections formed as rectilinear rods elongated in the lateral direction, the rods providing a magnetic flux path extending across the lateral extent of the active air gap region; and wherein the teeth of the respective sets are arranged displaced in the direction of motion relative to the teeth of the other sets.