Abstract: A motor includes a rotating portion rotatable about a center axis that extends vertically and a stationary portion that rotatably supports the rotating portion. The stationary portion includes a stator facing at least a part of the rotating portion in a radial direction, a circuit board disposed axially below the stator, and a resin portion covering at least a part of the stator, and the circuit board. The stator includes a plurality of coils disposed in a circumferential direction. The circuit board includes an axially upper surface mounted with an electric element that is disposed at least at one of positions including a position between two coils of the plurality of coils, adjacent to each other in the circumference direction, and a position below the coil.

Abstract: A motor includes a motor control circuit having a ground terminal, and a current limiting part disposed on a path electrically connecting the ground terminal and an external ground terminal included in an external circuit disposed outside the motor.

Abstract: 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.

Abstract: A stator assembly for use in a motor includes an annular stator and a circuit board. The stator having an annular shape is centered on a central axis extending vertically. The circuit board is above the stator in an axial direction. The stator includes a stator core, an insulator, a conductive wire, and a terminal pin. The stator core includes teeth. The insulator covers at least a portion of the stator core. The conductive wire is wound around the teeth via the insulator to define a coil. 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 circuit board includes a solder portion on an upper surface. The solder portion enables electrical connection with the terminal pin and is covered with a coating layer.

Abstract: A centrifugal fan includes a motor, an impeller, a circuit board, and a casing. The motor has a stator and a rotatable rotor. The impeller is fixed to and rotates with the rotor. The casing has a lower casing recessed downward and provided with a board housing portion accommodating the circuit board. The impeller includes a boss portion, blade portions, an upper shroud, and a lower shroud. The blade portions are disposed at intervals in the circumferential direction on an outer peripheral surface of the boss portion and extend radially outside. The upper shroud is connected to at least a portion of each of the blade portions on the upper side. The lower shroud is connected to at least a portion of the blade portion on the lower side. At least a portion of the lower end surface of the blade portion faces the upper surface of the circuit board.

Abstract: A motor includes a bearing housing, a stator, and a fixing member. The stator includes a stator core, an insulator, and a lead. The insulator is an insulating body that covers at least a portion of the stator core. The lead is wound around the stator core with the insulator interposed therebetween. The bearing housing includes a first bearing holding portion and a second bearing holding portion that hold two bearings; and an intermediate portion that is positioned between the first bearing holding portion and the second bearing holding portion in the vertical direction. The lower surface of the fixing member is in contact with the upper surface of the stator. The fixing member is fixed at a position opposite the intermediate portion in the radial direction. As a result, the displacement of the stator relative to the bearing housing is suppressed.

Abstract: A motor includes a rotating portion rotatable about a center axis that extends vertically and a stationary portion that rotatably supports the rotating portion. The stationary portion includes a stator facing at least a part of the rotating portion in a radial direction, a circuit board disposed axially below the stator, and a resin portion covering at least a part of the stator, and the circuit board. The stator includes a plurality of coils disposed in a circumferential direction. The circuit board includes an axially upper surface mounted with an electric element that is disposed at least at one of positions including a position between two coils of the plurality of coils, adjacent to each other in the circumference direction, and a position below the coil.

Abstract: A stator assembly for use in a motor includes an annular stator and a circuit board. The stator having an annular shape is centered on a central axis extending vertically. The circuit board is above the stator in an axial direction. The stator includes a stator core, an insulator, a conductive wire, and a terminal pin. The stator core includes teeth. The insulator covers at least a portion of the stator core. The conductive wire is wound around the teeth via the insulator to define a coil. 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 circuit board includes a solder portion on an upper surface. The solder portion enables electrical connection with the terminal pin and is covered with a coating layer.

Abstract: 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.

Abstract: A centrifugal fan includes a motor having a rotor, an impeller that is fixed to the rotor, a circuit board electrically connected to the motor, and a casing that accommodates the motor, the impeller, and the circuit board. The impeller includes a cylindrical boss portion fixed to the rotor, a plurality of blade portions that are arranged in a circumferential direction and extend radially outward, an upper shroud having an annular shape and connecting axially upper portions of the blade portions, and a lower shroud having an annular shape and connecting axially lower portions of the blade portions. The casing has a lower casing disposed axially below the impeller. The lower casing has a board accommodating portion for accommodating the circuit board, and a cover member facing a lower end face of the blade portions and an upper face of the circuit board in the axial direction.

Abstract: A centrifugal fan includes a motor, an impeller, a circuit board, and a casing. The motor has a stator and a rotatable rotor. The impeller is fixed to and rotates with the rotor. The casing has a lower casing recessed downward and provided with a board housing portion accommodating the circuit board. The impeller includes a boss portion, blade portions, an upper shroud, and a lower shroud. The blade portions are disposed at intervals in the circumferential direction on an outer peripheral surface of the boss portion and extend radially outside. The upper shroud is connected to at least a portion of each of the blade portions on the upper side. The lower shroud is connected to at least a portion of the blade portion on the lower side. At least a portion of the lower end surface of the blade portion faces the upper surface of the circuit board.

Abstract: A motor includes a bearing housing, a stator, and a fixing member. The stator includes a stator core, an insulator, and a lead. The insulator is an insulating body that covers at least a portion of the stator core. The lead is wound around the stator core with the insulator interposed therebetween. The bearing housing includes a first bearing holding portion and a second bearing holding portion that hold two bearings; and an intermediate portion that is positioned between the first bearing holding portion and the second bearing holding portion in the vertical direction. The lower surface of the fixing member is in contact with the upper surface of the stator. The fixing member is fixed at a position opposite the intermediate portion in the radial direction. As a result, the displacement of the stator relative to the bearing housing is suppressed.

Abstract: A motor includes a heat dissipating structure. The motor may be used for a fan and includes on an upper surface of a circuit board a heat dissipating layer. The heat dissipating layer has a high thermal conductivity. The fan also includes a coil provided on the teeth of a stator core. The heat dissipating layer and the coil axially face each other, and thermal conductive members are arranged therebetween. An outer dimension of the circuit board is greater than that of an impeller cup so that a radially outward portion of the circuit board protrudes radially outwardly from the impeller cup. The heat generated by the coil is transferred to the heat dissipating layer via the thermal conductive members. Therefore, the heat is dissipated from a wide area, which efficiently dissipates heat from the fan. In addition, since the circuit board and the heat dissipating layer protrude radially into an air-flow generated by an impeller, the heat transferred to the heat dissipating layer is actively dissipated.

Abstract: A motor includes a heat dissipating structure. The motor may be used for a fan and includes on an upper surface of a circuit board a heat dissipating layer. The heat dissipating layer has a high thermal conductivity. The fan also includes a coil provided on the teeth of a stator core. The heat dissipating layer and the coil axially face each other, and thermal conductive members are arranged therebetween. An outer dimension of the circuit board is greater than that of an impeller cup so that a radially outward portion of the circuit board protrudes radially outwardly from the impeller cup. The heat generated by the coil is transferred to the heat dissipating layer via the thermal conductive members. Therefore, the heat is dissipated from a wide area, which efficiently dissipates heat from the fan. In addition, since the circuit board and the heat dissipating layer protrude radially into an air-flow generated by an impeller, the heat transferred to the heat dissipating layer is actively dissipated.