Patent ID: 9059626
Filing Date: 2015-06-16
Classification: H02K

Abstract:
1. An electric machine comprising: a stator; and a mover capable of reciprocal linear motion with respect to the stator, one of the stator and the mover including one or more permanent magnet arrays and one or more winding portions, each of the one or more permanent magnet arrays including at least one of: wherein each winding portion of the one or more winding portions includes a winding conductor in the form of a coil and disposed to surround the one or more permanent magnet arrays, the other of the stator and the mover including one or more magnetic pole piece arrays, wherein each magnetic pole piece array includes a plurality of magnetic pole pieces spaced along a corresponding permanent magnet array of the one or more permanent magnet arrays, wherein a pitch of the plurality of permanent magnets and a pitch of the plurality of magnetic pole pieces are determined such that magnetic flux flows through two of the permanent magnets magnetized in the same direction and located in the permanent magnet array with one permanent magnet interposed between the two permanent magnets, and also flows through one or two of the magnetic pole pieces facing the one permanent magnet interposed between the two permanent magnets and magnetized in a direction different from the direction of magnetization of the two permanent magnets, wherein the pitch of the plurality of magnetic pole pieces included in each magnetic pole piece array is defined as P=360° in terms of electrical angle, and wherein the pitch of the plurality of permanent magnets included in each discrete permanent magnet array for the winding portion corresponding to one phase is defined as τp=P/2.