Abstract: The method for manufacturing a stator core includes: a punching step in which magnetic segments are punched out of an electromagnetic steel sheet that is coated with an organic insulating coating; a laminating step in which a laminated body is formed by laminating a predetermined number of the punched magnetic segments; a first preheating step in which a welding position on a wall surface of the laminated body is heated locally from a first end to a second end in a direction of lamination to decompose an organic component in the insulating coating thermally at the welding position; and a first welding step in which the welding position at which the organic component in the insulating coating is decomposed thermally is welded from the first end to the second end in the direction of lamination to interconnect and integrate the laminated magnetic segments.

Abstract: A windingly laminated core of a rotary electric machine, having a first number of magnetic poles in total and configured by unit cores, each of which is formed in an arc and thin plate shape and has a second number of magnetic poles, wherein a winding lamination is applied to the unit cores in a circumferential direction and in a spiral manner so as to form a cylindrical shape and a lamination thickness in an axial direction of the winding lamination is set to a predetermined thickness, includes an adjustment unit core having magnetic poles whose number is less than the second number, wherein the adjustment unit core is arranged at a start or an end of the winding lamination, in a circumferential direction, in order to align a rotational phase of the start of the winding lamination to a rotational phase of the end of the winding lamination.

Abstract: A method of making generally symmetrical lamination stacks for electrical machines comprises producing generally symmetrical pole tips from alternating asymmetrical pieces that each have an additional layer in the asymmetrical portion. With the alternating asymmetrical pieces combined, the resulting pole tip is generally symmetrical with a larger possible pole tip width compared with currently-used interleaved stamping techniques.

Abstract: A stator core manufacturing method has a winding process including an L-bending process in which an outer edge of a strip of steel sheet is bent at an angle to a general plane of the strip, an edgewise-bending process in which the outer edge of the strip is bent edgewise into an arc, and a roll-bending process in which the outer edge of the strip is bent into a curve warping in a thickness direction of the strip, wherein the L-bending process, the edgewise-bending process and the roll-bending process are performed successively in a predetermined sequence before the strip is wound in a spiral fashion so as to form a generally cylindrical core.

Abstract: A manufacturing method of a stator core of a rotating electrical machine includes a finishing process that simultaneously moves a coining punch divided in a circumferential direction and arranged around a helically stacked core to a center side in a radial direction and presses an outer surface of a core-back part of the helically stacked core while pressing an end side of the helically stacked core in an axial direction by a holding device.

Abstract: The invention relates to an electric machine, comprising a rotor (8; 50; 76) and a stator (9; 29; 77), wherein the rotor (8; 50; 76) and/or the stator (9; 29; 77) comprise at least one laminated core (2; 11; 32; 72) having a substantially rectangular cross-section, wherein the laminated core (2; 11; 32; 72) comprises a sheet metal strip (1), wherein the sheet metal strip (1) is wound in a coil shape.

Abstract: A laminated core 10 including a plurality of segment core sheets 13 spirally wound and laminated in layers while connecting portions 12 connecting the adjacent segment core sheets 13 are bent, ends of the segment core sheets 13 are aligned with each other and the connecting portions 12 in the adjacent layers are circumferentially displaced relative to each other, the connecting portions 12 located in outer peripheral areas 11 of the segment core sheets 13, the laminated core 10 comprising: a concave cutout 22 formed on a radially outward side of the connecting portion 12, the concave cutout 22 accommodating a radially expanded part 21 within an outer circle of the laminated core 10, the radially expanded part 21 formed in the connecting portion 12 radially outward at the bending of the connecting portion 12; an interior cutout 23 formed on a radially inward side of the connecting portion 12, the interior cutout 23 defining a bent position of the connecting portion 12; and depressed receptacles 16, 17 resp

Abstract: A windingly laminated core of a rotary electric machine, having a first number of magnetic poles in total and configured by unit cores, each of which is formed in an arc and thin plate shape and has a second number of magnetic poles, wherein a winding lamination is applied to the unit cores in a circumferential direction and in a spiral manner so as to form a cylindrical shape and a lamination thickness in an axial direction of the winding lamination is set to a predetermined thickness, includes an adjustment unit core having magnetic poles whose number is less than the second number, wherein the adjustment unit core is arranged at a start or an end of the winding lamination, in a circumferential direction, in order to align a rotational phase of the start of the winding lamination to a rotational phase of the end of the winding lamination.

Abstract: A stator of an outer rotor type motor is provided. The stator may include a helical core having stacked layers formed by winding a single metal sheet having a predetermined shape in a helical direction, a base and teeth that protrude from the base. The stator may also include an insulator made of electrical insulation material that surrounds the helical core, recesses formed in the base of the helical core that reduce stress due to the winding of the single metal sheet and disposed under the teeth, and auxiliary recesses formed in a bottom of the recesses.

Abstract: A laminated core (10) and a method for manufacturing the same formed with multiple continuous segment core pieces (13) wound in a spiral form by bending connecting portions (12) mutually connecting the segment core pieces (13), the connecting portions (12) being formed in an outer peripheral area (11), while the connecting portions (12) of vertically adjacent layers being displaced in a circumferential direction with inner edges or outer edges of the segment core pieces (13) fitted, the laminated core comprising: a concave cutout (21) provided in a radial exterior of each connecting portion (12) to dispose a radially expanded portion (20) within an outer circle of the laminated core (10), the radially expanded portion (20) being formed with each connecting portion (12) expanding radially outward at the time of bending each connecting portion (12); an interior cutout (22) provided in a radial interior of each connecting portion (12) to define a bending position of each connecting portion (12); and a receptacle

Abstract: A laminated spiral core includes core units and a plurality of swage portions. The core units form a rotor core. The core units have permanent-magnet attachment portions in which permanent magnets are to be disposed. Each of the core units has an arc shape. The plurality of swage portions connect the core units by swage-joining when the core units are spirally stacked in a predetermined number of layers. The plurality of swage portions are provided in the core units in a wave-shape to face the permanent-magnet attachment portions and provided at positions where an influence of magnetic flux paths in a rotor is minimal.

Abstract: In a brushless motor including a rotor having 2n poles and a stator having 3n slots, segment magnets are arranged in three columns in the axial direction, thus constituting rotor poles. The segment magnets of adjacent columns, which are identical in polarity, are displaced in the circumferential direction, thus forming a three-stage step-skew structure. The skew angle ?skew of each segment magnet is set to an electrical angle of 60° to 75°. The center angle of ?m of each segment magnet is set to 46.8° to 52.7°.

Abstract: A stator core is disclosed. The stator core is constructed in a structure in which stress and spring back of the stator core are minimized when a stator is manufactured in a spiral fashion, whereby workability is improved. The stator core includes a yoke formed in the shape of a band, a plurality of teeth protruding outward from one side of the yoke, the teeth being arranged at predetermined intervals in the longitudinal direction of the yoke, a plurality of notches formed at the inside of the yoke in the shape of a cutout such that the notches are arranged at equal intervals, and guide holes formed in the longitudinal direction of the yoke. The guide holes include holes formed at positions corresponding to the respective teeth and holes formed between the respective teeth.

Abstract: A laminated core (10) and a method for manufacturing the same formed with multiple continuous segment core pieces (13) wound in a spiral form by bending connecting portions (12) mutually connecting the segment core pieces (13), the connecting portions (12) being formed in an outer peripheral area (11), while the connecting portions (12) of vertically adjacent layers being displaced in a circumferential direction with inner edges or outer edges of the segment core pieces (13) fitted, the laminated core comprising: a concave cutout (21) provided in a radial exterior of each connecting portion (12) to dispose a radially expanded portion (20) within an outer circle of the laminated core (10), the radially expanded portion (20) being formed with each connecting portion (12) expanding radially outward at the time of bending each connecting portion (12); an interior cutout (22) provided in a radial interior of each connecting portion (12) to define a bending position of each connecting portion (12); and a receptacle

Abstract: A laminated body of a motor includes: a yoke spirally laminated to form a hollow cylindrical shape; a plurality of teeth protruding from one side edge of the yoke disposed along a longitudinal direction of the yoke and being separated apart at a predetermined distance; a plurality of notch portions on an opposite side edge of the yoke, each of the plurality of notch portions being aligned with each of the plurality of teeth; a stopping protrusion extendingly formed at a protruding end of the teeth in the longitudinal direction of the yoke; and an inclined portion having an inclined surface formed by decreasing a width of the stopping protrusion toward an end of the stopping protrusion so as to reduce cogging torque.