Patent ID: 8901785
Filing Date: 2014-12-02
Classification: H02K

Abstract:
1. An electric motor comprising: a first electric motor element that comprises an iron core and a plurality of windings; and a second electric motor element that comprises a plurality of permanent magnets forming a plurality of poles and that is oppositely situated against the first electric motor element, wherein the plurality of windings of the first electric motor element are configured such that, when three-phase alternating current is supplied, the plurality of windings cooperate with the plurality of permanent magnets of the second electric motor element to generate thrusts of the electric motor, wherein, the iron core has a plurality of teeth that project toward the second electric motor element, the plurality of teeth including primary teeth around each of which a winding is wound and secondary teeth around each of which no winding is wound, these primary teeth and secondary teeth being situated alternately with each other, and wherein a ratio between the number of poles formed by the plurality of permanent magnets of the second electric motor element and the number of phases formed by the plurality of windings of the first electric motor element is 4:3, wherein the windings forming the phases are in contact with the secondary teeth, and wherein a width of the secondary teeth is ¼ or less of a width of the primary teeth in a direction in which thrust is generated.