A method for manufacturing a stator for an electric rotary machine including a stator core formed by stacking a plurality of steel plates and a coil attached to the stator core, the method includes forming the steel plates, forming the stator core by stacking and fixing the plurality of steel plates with an adhesive, attaching the coil to the stator core, and changing a stack strength of the stator core, by deteriorating the adhesive such that a bending resonance frequency of the stator does not overlap with a pre-measured circular resonance frequency of the stator, the bending resonance frequency varying depending on the stack strength of the plurality of steel plates.

A stator includes a stator core which is annular and in which a plurality of metal plates are layered. The stator core includes a plurality of swaging portions, in which the metal plates are joined by swaging. A heat insulation space that blocks heat, which is transmitted from a welding portion, is formed in a swaging portion that is arranged in a position corresponding to the welding portion in a circumferential direction of the stator core among the swaging portions.

Metal sheets are connected in that a hole is introduced into metal sheets of a first stack, and a region of metal sheets of a second stack are deformed in a stack direction. The deformed region can be plastically deformed in such a way that there is interlocking of the deformed region with at least one metal sheet lying below same. In embodiments, the hole has a shape with a reduced width at the center.

A rotor for a rotating electric machine includes a rotor core provided with a pair of first magnets and a pair of second magnets that are located closer than the first magnets to an outer peripheral side of the rotor core. The rotor core includes a caulking portion disposed in a region between first and second imaginary lines in a radial direction of the rotor core. The first imaginary line is an arc passing through outer-peripheral-side end portions of respective long sides of rectangular-shaped cross sections of the first magnets. The second imaginary line is an arc passing through inner-peripheral-side end portions of respective long sides of rectangular-shaped cross sections of the second magnets. The arc of each of the first and second imaginary lines has a center of curvature that lies at an intersection of extensions of the long sides of the rectangular-shaped cross sections of the second magnets.

A rotor includes a magnet, a rotor core having an axially extending hole in which the magnet is accommodated, and a resin in the hole. The rotor core includes a first block and a second block that is arrayed in an axial direction together with the first block and is arranged such that a circumferential position of the hole is shifted with respect to the first block. Each of the first and second blocks has a resin groove that communicates with the hole included in each block, extends axially, and receives the resin. The resin groove of the first block and the resin groove of the second block are at least partially overlapped and connected in the axial direction, or are connected via the resin groove included in at least one other block disposed between the first and second blocks in the axial direction.

A motor component for a linear motor having a first primary part with two first electromagnetic coils and a second primary part with two second electromagnetic coils, arranged substantially parallel in relation to one another. At least one common laminated core unit is provided for the first and the second primary parts, which common laminated core unit comprises one-piece sheet-metal elements. Each of the one-piece sheet-metal elements of the laminated core unit in each case has first recesses, which are arranged one behind the other in the longitudinal direction of an adjustment path of the linear motor, for the first coils of the first primary part and at second recesses, which are arranged one behind the other in the longitudinal direction of the adjustment path of the linear motor, for the second coils of the second primary part.

A brushless motor that can uniformly wind a coil winding at a low cost even with a stator core in which intervals between tooth tips of a plurality of pole teeth provided in a circumferential direction of an annular section to protrude in a radial direction differ. An auxiliary tooth tip section is formed integrally on a tooth tip of a required pole tooth of a stator core in which a plurality of pole teeth are provided in a circumferential direction of an annular section to protrude in a radial direction, and in which circumferential intervals between adjacent tooth tips are not uniform, and gaps between the tooth tips of all the pole teeth of the stator core are formed uniform.

A laminated core includes a plurality of electrical steel sheets stacked in a thickness direction, each of the electrical steel sheets includes an annular core back part; a plurality of fastening parts are provided in the core back part at intervals in a circumferential direction; an adhesion region is formed on an outer circumferential side from the fastening parts in the core back part; and a non-adhesion region is formed on an inner circumferential side from the fastening parts in the core back part.

A rotor includes a shaft, a rotor core, at least one magnet, and at least one fixing portion. The shaft extends in an axial direction. The rotor core includes laminations, and at least one caulking portion. The laminations are stacked in the axial direction. The at least one caulking portion is located at a radial-directional inner side of the at least one magnet to caulk the laminations to each other. The at least one magnet is embedded in the rotor core. The at least one fixing portion fixes at least portions of outer peripheral edges of the laminations to each other.

A core product includes a first core block and a second core block. The first core block includes: a first block body including a first end surface and a second end surface, and a first resin injection portion; a first solidified resin provided in the first resin injection portion; and a first gate mark integrated with the first solidified resin and protruding outward more than the first end surface. The second core block includes: a second block body including a third end surface and a fourth end surface, and a second resin injection portion; a second solidified resin provided in the second resin injection portion; and a second gate mark integrated with the second solidified resin and protruding outward more than the fourth end surface. The first core block and the second core block are stacked such that the second end surface and the third end surface face each other.