A method of winding a stator of a polyphase brushless DC motor, the stator including uniformly spaced stator teeth which project inwardly from a stator core and leave a cylindrical inner region exposed. The teeth are wound in pairs with a winding wire to form a winding pair, the winding of each winding pair being performed by, starting from a wire beginning of a winding wire, winding a first stator tooth in a first direction, guiding the winding wire to a second stator tooth which immediately follows the first stator tooth in a first circumferential direction, and winding the second stator tooth in a second direction opposite to the first direction. The winding pairs are structured to be supplied with current so that a north pole and a south pole are opposite each other in the stator in the circumferential direction.

An automatic winding device for winding wire onto a pole of a multi-pole rotor, the pole includes a bottom and a head, the device comprising: a support vice supporting the rotor and capable of rotational movement about a first axis, a needle plate, centred on the pole along the first axis and comprising four placement needles, which is capable of translational and rotational movement about the first axis, a conducting wire, attached to the rotor and to a wire winder, in contact with at least one placement needle, the winding device being able to perform a number of sequences from an “initial configuration” to a “winding configuration” wherein, successively, the needle plate is rotated and the pole is moved translationally with respect to the needle plate along the first axis so as to wind the conducting wire around the pole as far as a “final configuration”.

An automatic winding device for winding wire onto a pole of a multi-pole rotor, the pole includes a bottom and a head, the device comprising: a support vice supporting the rotor and capable of rotational movement about a first axis, a needle plate, centred on the pole along the first axis and comprising four placement needles, which is capable of translational and rotational movement about the first axis, a conducting wire, attached to the rotor and to a wire winder, in contact with at least one placement needle, the winding device being able to perform a number of sequences from an “initial configuration” to a “winding configuration” wherein, successively, the needle plate is rotated and the pole is moved translationally with respect to the needle plate along the first axis so as to wind the conducting wire around the pole as far as a “final configuration”.

Provided is a segment-core coupled body, including a plurality of segment cores each including a core back and a tooth; and a plurality of coupling portions configured to couple the core backs to one another, wherein the plurality of segment cores and the plurality of coupling portions are each a laminated body of magnetic sheets, wherein the plurality of coupling portions each include: a posture holding portion adjacent to a gap defined between adjacent core backs; a first thin portion configured to couple one corner portion of the adjacent core backs and the posture holding portion; and a second thin portion configured to couple another corner portion of the adjacent core backs and the posture holding portion, and wherein, the posture holding portion projects toward a radially outer side with respect to the adjacent core backs.

A stator for use in a motor includes a stator core, an insulator, a coil, and a terminal pin. The stator core includes a core back having an annular shape and teeth. The insulator covers at least a portion of the stator core. The coil is defined by a conductive wire wound around the teeth via the insulator. The terminal pin extends axially upward from an upper surface of the insulator and is connected to an end portion of the conductive wire. The insulator includes an annular portion, first protruding portions, and second protruding portions. The annular portion covers at least a portion of the core back and is centered on the central axis. The plurality of first protruding portions cover at least a portion of each of the teeth and protrude radially outward from the annular portion.

A stator for use in a motor includes a stator core, an insulator, a coil, and a terminal pin. The stator core includes a core back having an annular shape and teeth. The insulator covers at least a portion of the stator core. The coil is defined by a conductive wire wound around the teeth via the insulator. The terminal pin extends axially upward from an upper surface of the insulator and is connected to an end portion of the conductive wire. The insulator includes an annular portion, first protruding portions, and second protruding portions. The annular portion covers at least a portion of the core back and is centered on the central axis. The plurality of first protruding portions cover at least a portion of each of the teeth and protrude radially outward from the annular portion.

A stator has a plurality of core pieces being arranged in a ring shape around a rotation axis, and is configured such that a coupling part having a fitting structure is formed between the core pieces adjacent to each other in an arrangement of the ring shape, the coupling part allowing rotation about a pillar portion and restricting displacement in the axis direction by a snap-fit coupling that is formed with the pillar portion being provided on the yoke side of one of the core pieces and extending in a direction parallel to the axis and an open ring portion being provided on the yoke side of the other of the core pieces.

A manufacturing method for a coil includes: a step of winding a wire (conductive wire) in multiple layers and multiple rows and forming a coil having a trapezoidal cross-sectional shape; a step of arranging the coil in a molding space surrounded by a plurality of split dies; and a step of moving the slit die in a direction of narrowing the molding space to mold the cross-sectional shape of the coil. In the step of molding the cross-sectional shape, at least one of the plurality of split dies is moved to mold the cross-sectional shape into a fan shape by surfaces formed in the split dies.

A manufacturing method for a coil includes: a step of winding a wire (conductive wire) in multiple layers and multiple rows and forming a coil having a trapezoidal cross-sectional shape; a step of arranging the coil in a molding space surrounded by a plurality of split dies; and a step of moving the slit die in a direction of narrowing the molding space to mold the cross-sectional shape of the coil. In the step of molding the cross-sectional shape, at least one of the plurality of split dies is moved to mold the cross-sectional shape into a fan shape by surfaces formed in the split dies.

A motor is provided that reduces noise and vibration, and a method is provided for manufacturing the motor and a cleaner having the motor. The motor includes a stator including a plurality of teeth that are spaced apart from each other in a predetermined interval in a circumferential direction and a coil that is wound around the plurality of teeth, a rotor that is disposed inside the stator, and a cage that is disposed in at least one of a plurality of slots that are formed between the plurality of teeth. The cage is configured to include a flow path to inject a bonding agent into at least one slot.