Provided is a motor capable of having an improved output while keeping the mechanical strength of the stator core. A motor includes: a stator including a stator core including an annular yoke having an outer part and an inner part and teeth extending inwardly from the inner part of the yoke, and a coil wound around the teeth; and a rotor rotatably disposed inside of the stator. The stator core includes the lamination of sheet members made of a soft magnetic material. Each sheet member has a binding part to bind the sheet members in the lamination at a first part corresponding to the outer part of the yoke. At least the binding part of the first part is made of an amorphous soft magnetic material. The sheet member has a second part other than the first part, and the second part is made of a nanocrystal soft magnetic material.

A laminated core includes a plurality of electrical steel sheets stacked in a thickness direction, the electrical steel sheet includes an annular core back part and a plurality of tooth parts that protrude from the core back part in a radial direction and are disposed at intervals in a circumferential direction of the core back part, a fastening part is provided in a portion of the core back part corresponding to the tooth part, and an adhesion part is provided in the tooth part.

An electric-rotating-machine rotor has a rotor core in which ring-shaped plate materials that are each magnetic materials are stacked in an axial direction and a shaft-press-fitted into an inner circumferential surface of the rotor core; the inner circumferential surface has a first press-fitting portion that is an axial-direction section into which the shaft is inserted and a second press-fitting portion that is an axial-direction section adjacent to the first press-fitting portion and into which the shaft is inserted with an interference larger than that of the first press-fitting portion, and the shaft is press-fitted into the inner circumferential surface of the rotor core from the first press-fitting portion side. As a result, the electric-rotating-machine rotor in which no gap is caused between the stacked plate materials can be realized at low cost. Moreover, it is made possible to produce the electric-rotating-machine rotor through simple processes and at low cost.

A device for manufacturing a laminated iron core includes: a punch unit configured to form protrusions, and including N number of punches as a set, the N being a natural number larger than M; and N number of auxiliary punches. The N number of auxiliary punches are configured such that L number of auxiliary punches selected from the N number of auxiliary punches performs a nullification processing on a metal sheet, the nullification processing being configured to nullify a processing with the L number of punches among the N number of punches, the L being the natural number that is obtained by subtracting the M from the N. According to the above configurations, for example, since a processing position with the plurality of punches is limited in one position, a positional accuracy of protrusions formed in punched members with the plurality of punches is improved.

A rotor and a motor including the same. The motor includes a stator and a rotor configured to rotate by interacting with the stator. The rotor includes a plurality of permanent magnets disposed in a circumferential direction of the rotor and rotor cores disposed between the plurality of permanent magnets. The rotor core includes a notch cut inward from a circumferential surface thereof, and the notch is formed in an asymmetric shape. The rotor core has a notch formed on one side of the circumferential surface and the rotor core has a shape inverted left and right with the rotor core are alternately stacked, so that a magnitude of a synthetic cogging torque generated in the rotor is reduced.

A rotor lamination for an electric machine includes a body having a first axial surface, a second axial surface, a central opening, and an outer annular edge defining a radius. A plurality of magnet receiving openings are formed in the body. Each of the plurality of magnet receiving openings includes a first magnet receiving portion and a second magnet receiving portion. A composite insert is mounted in the body. The composite insert extending along the radius across the magnet receiving opening physically separating the first magnet receiving portion from the second magnet receiving portion.

A stator includes a yoke extending to surround an axis, and having an outer circumference and an inner circumference. The yoke has a crimping portion projecting from the outer circumference, and a split surface provided at a position different from a position of the crimping portion. The yoke has a magnetic path which is provided between the outer circumference and the inner circumference and through which magnetic flux flows. When L1 represents the width of the magnetic path, and L2 represents the width of the yoke including the crimping portion, L1<L2<2.6×L1 is satisfied.

A laminated core manufacturing method according to the present invention is a manufacturing method for a laminated core including: a laminated body that is configured by laminating core strips that are made of a magnetic material, the laminated body including: a core back portion; and a tooth portion; and electrically insulating members that are disposed on two side portions of the tooth portion, wherein the laminated core manufacturing method includes a bonding step in which the insulating members are pressed onto each of the side surfaces of the tooth portion of the laminated body so as to integrate the laminated body and also so as to fix the insulating members to the laminated body, by means of at least one of an adhesive and a pressure-sensitive adhesive that is disposed between each of the side surfaces of the tooth portion and the insulating members.

A laminated core for an electric machine includes a plurality of laminated core pieces. Each of the plurality of core pieces includes a first portion and a second portion having a plate thickness smaller than a plate thickness of the first portion.

The rotor includes a drive shaft, a first rotor core unit, and a second rotor core unit. The first rotor core unit is configured from a first iron core material having a through-hole into which the drive shaft is inserted, and a plurality of first permanent magnets, and includes a first reference surface at which the first iron core material is flush with or protruding further than first permanent magnets. The second rotor core unit is configured from a second iron core material having a through-hole into which the drive shaft is inserted, and a plurality of second permanent magnets, and has a second reference surface at which the second iron core material is flush with or protruding further than second permanent magnets, the second rotor core unit being laminated in an axial direction on the first rotor core unit such that the first reference surface and the second reference surface contact each other.