Abstract: A winding machine includes a winding core around which a winding is wound, a first winding jig and a second winding jig positioned with the winding core interposed therebetween in an axial direction of a central axis of the winding core, and a first gripper and a second gripper that are located on an outer side of the winding core in a radial direction around the central axis. An outer edge portion of the first winding jig in the radial direction and an outer edge portion of the second winding jig in the radial direction are located on an outer side, in the radial direction, from the winding core. Each of the first gripper and the second gripper includes a pair of rollers to interpose and grip the winding. At least one of the first gripper or the second gripper is rotatable about the central axis.

Abstract: A motor includes a rotor that is rotatable about a central axis and a stator that radially opposes the rotor with a gap interposed therebetween. The stator includes a stator core that includes an annular core back surrounding the central axis and a tooth extending to a radially inner side from the core back, and a coil that is wound around the tooth. The stator core includes at least one hole penetrating in an axial direction of the central axis, and a slit including a space connecting the hole and a radially outer side of the stator core. A heat pipe is held in the hole and extends in an axial direction along the hole, and an adhesive is between the hole and the heat pipe.

Abstract: A coil attachable to a tooth extending to one radial side of the tooth from an annular core back surrounding a central axis of a motor includes a first winding body including a first wound flat wire, and a second winding body including a second wound flat wire, that is located on a radial side of the first winding body, and that is connected to the first winding body. When N is a freely-selected integer of 1 or more, and M is a freely-selected integer larger than N, the first winding body is an N-layer winding body aligned and wound in two rows aligned in a radial direction, and the second winding body is an M-layer winding body aligned and wound in two rows aligned in the radial direction.

Abstract: 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.

Abstract: Provided is a manufacturing method of a wire rod for forming a coil, the manufacturing method including the steps of: placing an element wire in a forming space surrounded by a plurality of split dies; and pressure-forming the element wire by moving the plurality of split dies in a direction of narrowing the forming space. In the step of pressure-forming the element wire, at least one of the plurality of split dies is moved, and the plurality of split dies each having a surface that changes in shape in a longitudinal direction of an element wire to pressure-form the element wire into the wire rod having a plurality of different cross-sectional shapes in the longitudinal direction.

Abstract: A method of manufacturing a coil includes forming a wound body by winding a coil wire in multiple layers, and forming a coil by pressing the wound body using a die surrounding the wound body and compressively deforming the wound body. The wound body has a contour of a rectangular or substantially rectangular shape in cross section, and includes coil wire portions located in the cross section of the coil wire, the coil wire portions being aligned along each side of the rectangular or substantially rectangular shape. The coil has a contour of a fan shape or approximate fan shape in the cross section, where the coil wire portions are aligned in a direction along an arc and a radial direction of the fan shape or approximate fan shape.

Abstract: A stator configured to rotate of a rotor about a central axis includes a first member having a plurality of first concavity portions located in a circumferential direction at a preset interval, each of first concavity portions having a pair of first inner side face and second inner side face whose a circumferential-directional distance therebetween with respect to the central axis becomes narrow from one radial-directional side towards the other radial-directional side with respect to the central axis; and a plurality of second members, each of which having a first protrusion extending along the first inner side face, a second protrusion extending along the second inner side face, and a teeth portion protruding from the first protrusion and the second protrusion to the other radial-direction side, wherein the plurality of second members are formed to corresponding to the plurality of concavity portions, respectively.

Abstract: A stator includes a core back, teeth, and coils. Each of the coils includes an axially extending portion extending in an axial direction and located on a circumferential first side of a corresponding one of the teeth to which the coil is mounted. Each of the coils includes a coil wire of which a portion defining or functioning as the axially extending portion has a quadrangle shape in sectional view. The core back includes, on its radial first surface, a first core back surface connecting to a joint portion, to which a corresponding one of the teeth is connected, of the radial first surface of the core back.

Abstract: A method of manufacturing a coil includes forming a wound body by winding a coil wire in multiple layers, and forming a coil by pressing the wound body using a die surrounding the wound body and compressively deforming the wound body. The wound body has a contour of a rectangular or substantially rectangular shape in cross section, and includes coil wire portions located in the cross section of the coil wire, the coil wire portions being aligned along each side of the rectangular or substantially rectangular shape. The coil has a contour of a fan shape or approximate fan shape in the cross section, where the coil wire portions are aligned in a direction along an arc and a radial direction of the fan shape or approximate fan shape.

Abstract: 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.

Abstract: Provided is a manufacturing method of a wire rod for forming a coil, the manufacturing method including the steps of: placing an element wire in a forming space surrounded by a plurality of split dies; and pressure-forming the element wire by moving the plurality of split dies in a direction of narrowing the forming space. In the step of pressure-forming the element wire, at least one of the plurality of split dies is moved, and the plurality of split dies each having a surface that changes in shape in a longitudinal direction of an element wire to pressure-form the element wire into the wire rod having a plurality of different cross-sectional shapes in the longitudinal direction.

Abstract: A stator configured to rotate of a rotor about a central axis includes a first member having a plurality of first concavity portions located in a circumferential direction at a preset interval, each of first concavity portions having a pair of first inner side face and second inner side face whose a circumferential-directional distance therebetween with respect to the central axis becomes narrow from one radial-directional side towards the other radial-directional side with respect to the central axis; and a plurality of second members, each of which having a first protrusion extending along the first inner side face, a second protrusion extending along the second inner side face, and a teeth portion protruding from the first protrusion and the second protrusion to the other radial-direction side, wherein the plurality of second members are formed to corresponding to the plurality of concavity portions, respectively

Abstract: A motor armature includes a core including a stack of electromagnetic steel sheets, a tooth portion extending in a radial direction of the motor, and a conductive wire that is wound around the tooth portion in a circumferential direction. First recessed portions extending in the radial direction are located in a surface of the tooth portion of each of the electromagnetic steel sheets of the core.

Abstract: An inspection signal generator of an acoustic device outputs a first inspection signal. An amplifier receives a first reference signal, and outputs a second inspection signal according to the first inspection signal. A first detector is electrically connected to an output side of the amplifier, and outputs a first detection signal based on the second inspection signal. The first detector is electrically connected to the output side of the amplifier, and outputs the first detection signal based on the second inspection signal. A determiner compares a first detection signal output from the first detector with a preset determination reference signal so as to detect electrical abnormality between a ground terminal and an output terminal electrically connected to the output side of the amplifier.

Abstract: A proximity alarm device includes a control unit, an amplifying unit, an output terminal, a ground terminal, a detection unit, and a determining apparatus. The control unit receives an input of a referencing signal. An output of the control unit is electrically connected to the amplifying unit. An output of the amplifying unit is electrically connected to an output terminal. The ground terminal is electrically connected to a ground. The output of the amplifying unit is electrically connected to the detection unit. An output of the detection unit is electrically connected to the determining apparatus. Then, the determining apparatus compares a detection signal detected by the detection unit and a determination reference signal with each other.

Abstract: An inspection signal generator of an acoustic device outputs a first inspection signal. An amplifier receives a first reference signal, and outputs a second inspection signal according to the first inspection signal. A first detector is electrically connected to an output side of the amplifier, and outputs a first detection signal based on the second inspection signal. The first detector is electrically connected to the output side of the amplifier, and outputs the first detection signal based on the second inspection signal. A determiner compares a first detection signal output from the first detector with a preset determination reference signal so as to detect electrical abnormality between a ground terminal and an output terminal electrically connected to the output side of the amplifier.

Abstract: A motor armature includes a core including a stack of electromagnetic steel sheets, a tooth portion extending in a radial direction of the motor, and a conductive wire that is wound around the tooth portion in a circumferential direction. First recessed portions extending in the radial direction are located in a surface of the tooth portion of each of the electromagnetic steel sheets of the core.

Abstract: A proximity alarm device includes a control unit, an amplifying unit, an output terminal, a ground terminal, a detection unit, and a determining apparatus. The control unit receives an input of a referencing signal. An output of the control unit is electrically connected to the amplifying unit. An output of the amplifying unit is electrically connected to an output terminal. The ground terminal is electrically connected to a ground. The output of the amplifying unit is electrically connected to the detection unit. An output of the detection unit is electrically connected to the determining apparatus. Then, the determining apparatus compares a detection signal detected by the detection unit and a determination reference signal with each other.

Abstract: A spindle motor includes a flat stator, a rotor magnet arranged above the stator, and a magnetic portion made of a ferromagnetic material. The magnetic portion is positioned lower than the stator and the magnetic portion are axially overlapped with coils. A magnetic attraction force is generated between the magnetic portion and the rotor magnet. Since the magnetic portion is positioned lower than the stator, it is possible to cause magnetic fluxes to efficiently flow between the rotor magnet and the stator. Further, the stator includes a protrusion protruded radially outward beyond an outer circumferential portion of a rotor hub. Accordingly, in a plan view, the stator is positioned radially outward of the rotor hub.

Abstract: A protrusion (7b3) directed axially downwards is provided at a bottom portion (7b) of a housing (7), and an outer peripheral surface (7b31) of the protrusion (7b3) is fixed to an inner peripheral surface (6a) of a bracket (6). When a thrust load is applied to the bottom portion (7b) of the housing (7), a part of the load is supported by the bracket (6) via the protrusion (7b3). Thus, a strength of a boundary portion (P) between a side portion (7a) and the bottom portion (7b) of the housing (7) increases, making it possible to prevent rupture of the boundary portion (P) due to an excessive thrust load. On the other hand, a wall thickness of the bottom portion (7b) can be made invariable, so it is possible to suppress deformation through molding shrinkage of a thrust bearing surface formed on an inner end surface (7b1) of the bottom portion (7b).