Patent ID: 8624458

Claim:
An electrical, rotary machine, said machine comprising: a first stator core section being substantially circular and including a plurality of teeth, a second stator core section being substantially circular and including a plurality of teeth, a coil arranged between the first and second circular stator core sections, and a rotor including a plurality of permanent magnets, wherein the first stator core section, the second stator core section, the coil and the rotor are encircling a common geometric axis, and wherein the plurality of teeth of the first stator core section and the second stator core section are arranged to protrude towards the rotor, wherein the teeth of the second stator core section are circumferentially displaced in relation to the teeth of the first stator core section, and the entirety of the teeth of the second stator core section are radially separated from the entirety of the teeth of the first stator core section by a circumferentially extending area, the area extending circumferentially and not being interrupted by teeth from the first or second stator core section, the area forming a ring unbroken by the teeth from the first or second stator core section, wherein the permanent magnets in the rotor are separated in the circumferential direction from each other by axially extending pole sections made from soft magnetic material, wherein the axially extending pole sections that separate the permanent magnets extend axially to both the first and second stator core sections, and wherein the magnetization direction of the permanent magnets of the rotor is substantially circumferential so as to cause the magnetic flux path generated in an axially extending pole section during use of the electrical rotary machine to extend at least circumferentially and axially and to concentrate the magnetic flux from a facing area of the adjacent permanent magnets to a position of a tooth of one of the stator sections, wherein each tooth of the first stator core section is circumferentially positioned in the middle of the gap formed between two teeth of the second stator core section.