Abstract: A method for manufacturing a yoke includes forming a through-hole that is open in a yoke bottom surface and a cylindrical bearing support portion by burring an edge of the through-hole using a burring punch, wherein the burring punch is located on a base end side at a distance from a cylinder front-end portion of the bearing support portion so as to form a ring-shaped flange portion inclined toward an inner radial side on the cylinder front-end portion of the bearing support portion.

Abstract: In a fan motor 1 for a vehicle, when opening a vent hole 11 in a cylinder bottom portion 2a of a yoke 2 of the fan motor 1, this is performed so that the opening part cannot be visually observed when the vent hole 11 is viewed head on. The vent hole 11 is formed by dividing the same at a laterally long dividing line so that, at a dividing line X having an angular shape whose left-right direction central portion intrudes into the side of a vent hole upper half portion 12, the upper half portion 12 has a spherical shape that bulges out to the outside of a bottom surface as it is further at the lower side and thus has an inside and outside staggered form with respect to a lower half portion 13.

Abstract: A rotating electric machine includes a shaft and an armature with a core that includes a shaft hole. The core includes a plurality of core materials that are laminated. When pressing in and fixing the shaft to the shaft hole, the shaft hole is applied with an ironing process in advance in order to rectify a cylindrical hole shape of the shaft hole.

Abstract: A method for manufacturing a yoke includes forming a through-hole that is open in a yoke bottom surface and a cylindrical bearing support portion by burring an edge of the through-hole using a burring punch, wherein the burring punch is located on a base end side at a distance from a cylinder front-end portion of the bearing support portion so as to form a ring-shaped flange portion inclined toward an inner radial side on the cylinder front-end portion of the bearing support portion.

Abstract: A laminated core segment 30 into which a stator core is split has a core main body 31 that extends in an arc shape. On one end section of the core main body 31 there is formed a connecting section 40, and on the other end section there is formed a connecting section 41. The connecting section 40 is able to connect with the connecting section 41 of another laminated segment 30. In the connecting section 40 there is provided a protruding protrusion section 48, and the protrusion section 48 interferes with an interference section 53 on the connecting section 41 side when the stator core 30 is forced towards the direction in which the stator core is split. As a result, an assembly operation of the stator core becomes easier, and a magnetically excellent connecting structure can be obtained.

Abstract: A rotating electric machine includes a shaft and an armature with a core that includes a shaft hole. The core includes a plurality of core materials that are laminated. When pressing in and fixing the shaft to the shaft hole, the shaft hole is applied with an ironing process in advance in order to rectify a cylindrical hole shape of the shaft hole.

Abstract: A rotating electric machine includes a bearing; a rotating shaft supported via the bearing; and a yoke with a bearing support portion formed on a yoke bottom surface. The bearing support portion houses the bearing, and on a cylinder front-end portion of the bearing support portion, integrally formed is a ring-shaped flange portion that is inclined toward an inner radial side so as to prevent the bearing from coming off one end side.

Abstract: A laminated core segment 30 into which a stator core is split has a core main body 31 that extends in an arc shape. On one end section of the core main body 31 there is formed a connecting section 40, and on the other end section there is formed a connecting section 41. The connecting section 40 is able to connect with the connecting section 41 of another laminated segment 30. In the connecting section 40 there is provided a protruding protrusion section 48, and the protrusion section 48 interferes with an interference section 53 on the connecting section 41 side when the stator core 30 is forced towards the direction in which the stator core is split. As a result, an assembly operation of the stator core becomes easier, and a magnetically excellent connecting structure can be obtained.

Abstract: In a fan motor 1 for a vehicle, when opening a vent hole 11 in a cylinder bottom portion 2a of a yoke 2 of the fan motor 1, this is performed so that the opening part cannot be visually observed when the vent hole 11 is viewed head on. The vent hole 11 is formed by dividing the same at a laterally long dividing line so that, at a dividing line X having an angular shape whose left-right direction central portion intrudes into the side of a vent hole upper half portion 12, the upper half portion 12 has a spherical shape that bulges out to the outside of a bottom surface as it is further at the lower side and thus has an inside and outside staggered form with respect to a lower half portion 13.

Abstract: Four knurls are formed by a molding apparatus (31) to be evenly spaced circumferentially on and protrude from an outer circumferential surface of an armature shaft (14). The molding apparatus (31) has a first mold (32) and a second mold (33), which are movable in directions of being close to and separating from each other, wherein the first mold (32) is provided with a pair of first molding edges (43) and the second mold (33) is provided with a pair of second molding edges (45). The respective molding edges (43) and (45) are formed into parallelogram sections, which have cutting faces (51) and (61) parallel to a moving direction of the second mold (33), extrusion faces (52) and (62) formed at acute angels with respect to the cutting faces (51) and (61), and load supporting faces (53) and (63) parallel to the extrusion faces (52) and (62). By pressing those molding edges (43) and (45) against the outer circumferential surface of the armature shaft (14), the knurls is formed.

Abstract: A plurality of square projections 26 are arranged in two mutually perpendicular directions at the pitch of P on to the surface of a plate member 27 between a first group of punched recesses 29a. The pitch P is twice the length of a side of each punched recess 29a. Shifted with respect to the first group of punched recesses 29a by P/2 in both the vertical and horizontal directions is a second group of punched recesses 29b. The punched recesses 29a and 29b define the projections 26 in the parts which are not occupied by these recesses generally in the pattern of a checker board. Because the projections 26 are separated from each other, and can effectively dissipate heat therefrom, the increase in the contact resistance due to heat generation can be prevented, and the efficiency of the starter motor can be increased.

Abstract: The capability of heat dissipation from the contact surface of a magnetic switch for a starter motor is improved without increasing the fabrication cost. A punch 28 having a plurality of square projections arranged in two mutually perpendicular directions at the pitch of P is applied to the surface of a plate member 27 to form a first group of punched recesses 29a. The pitch P is twice the length of a side of each punched recess 29a. Then, the punch 28 is shifted with respect to the first group of punched recesses 29 by P/2 in both the vertical and horizontal directions before forming a second group of punched recesses 29b. The punched recesses 29a and 29b define projections 26 in the parts which are not occupied by these recesses generally in the pattern of a checker board.