Abstract: A motor includes a rotating portion with a shaft extending along a rotation axis and a rotor that rotates together with the shaft, a stationary portion with a stator located radially outside of the rotor and a magnetic sensor located above the rotor to detect a rotational position of the rotor. The rotor includes a rotor core, a rotor magnet located radially outside of the rotor core and under the magnetic sensor, in contact with the rotor core or located opposite to the rotor core with a first gap therebetween. A recessed portion is recessed from each of an upper end surface and an outer circumferential surface of the rotor core. An inner circumferential surface of a lower end portion of the rotor holder is fixed to a radially inner surface of the recessed portion.

Abstract: A motor includes a shaft, a rotor magnet, an armature, an upper bracket, a lower bracket, and a fixing member. An insulator includes magnetic pole tooth insulating portions, each of which covers a separate one of magnetic pole teeth, and a core back insulating portion configured to cover at least portions of upper and lower end surfaces of a core back. A stator core includes a fixing member arranging portion. The core back insulating portion includes a core back insulating projecting portion configured to project in an axial direction away from a surface covering the core back, and including a radially inner surface located radially inward of a radially inner end of the fixing member arranging portion. The core back insulating projecting portion includes a cut portion at a position radially opposed to the fixing member.

Abstract: A motor includes an armature arranged radially outside a rotor magnet, and a casing configured to fix the armature and hold upper and lower bearings configured to rotatably support a shaft at a radial center thereof. The armature includes a stator core, an insulator arranged to cover the stator core, coils each of which is defined by a conducting wire wound around a separate one of magnetic pole teeth with the insulator intervening therebetween, and passage lines each of which is arranged circumferentially between adjacent ones of the magnetic pole teeth to electrically connect one of the coils and another one of the coils with each other. The insulator includes magnetic pole tooth insulating portions arranged to cover a separate one of the magnetic pole teeth; and a core back insulating portion integral with each magnetic pole tooth insulating portion.

Abstract: A motor includes a bearing portion including upper and lower bearings, a shaft rotatably supported by the bearing portion, a rotor magnet that rotates together with the shaft, an armature radially outside the rotor magnet, a casing that fixes the armature and holds the upper and lower bearings at a radial center thereof, and a cover. The armature includes a stator core including magnetic pole teeth, an insulator that covers at least upper and lower surface of each of the magnetic pole teeth, and coils. The casing includes a hole passing through an axial end surface of the casing in the axial direction, and the cover is opposite the hole between the casing and the armature.

Abstract: A motor includes a rotating portion with a shaft extending along a rotation axis and a rotor that rotates together with the shaft, a stationary portion with a stator located radially outside of the rotor and a magnetic sensor located above the rotor to detect a rotational position of the rotor. The rotor includes a rotor core, a rotor magnet located radially outside of the rotor core and under the magnetic sensor, in contact with the rotor core or located opposite to the rotor core with a first gap therebetween. A recessed portion is recessed from each of an upper end surface and an outer circumferential surface of the rotor core. An inner circumferential surface of a lower end portion of the rotor holder is fixed to a radially inner surface of the recessed portion.

Abstract: A motor includes a rotating portion including a shaft and a rotor, and a stationary portion including a stator and a magnetic sensor. The magnetic sensor is located above the rotor to detect the rotational position of the rotor. The rotor includes a tubular rotor core defined by laminated steel sheets; a rotor magnet including an upper end surface at an axial level higher than an axial level of an upper end surface of the rotor core; and a rotor holder including a ferromagnetic body, and above the rotor core and radially inside of the rotor magnet. Each of the rotor core and an outer cylindrical portion of the rotor holder is in contact with the rotor magnet or opposite to the rotor magnet with a gap intervening therebetween.

Abstract: An inner-rotor motor includes a shaft, a rotor magnet, a stator, a housing including a housing tubular portion extending along a rotation axis, a cap, and a bearing portion. The cap is located above the housing, and includes a cap bottom portion and a cap tubular portion which extends downward from the cap bottom portion. A core back of the stator includes a tubular outer circumferential surface including a plurality of stator contact portions in contact with the housing tubular portion. The stator contact portions are spaced from one another in a circumferential direction. The cap tubular portion includes a plurality of cap contact portions in contact with the housing and spaced from one another in the circumferential direction. At least one of the cap contact portions is located at a circumferential position different from a circumferential position of each stator contact portion.

Abstract: A motor includes a shaft supported by upper and lower bearings and rotatable about an axis; a rotor magnet fixed to the shaft; a stator arranged radially outside and opposite to the rotor magnet with a gap therebetween; an upper bracket holding the upper bearing; and a lower bracket holding the lower bearing. The upper bracket includes an upper cylindrical cover press fitted to a stator core from above, an upper bearing holding portion, and a top plate portion arranged to join the upper cylindrical cover and the upper bearing holding portion. The lower bracket includes a lower cylindrical cover press fitted to the stator core from below, a lower bearing holding portion, and a bottom plate portion arranged to join the lower cylindrical cover and the lower bearing holding portion. Each of the upper and lower brackets is fixed to the stator core through press fitting.

Abstract: In an inner-rotor motor, an armature includes a stator core including an annular core back and magnetic pole teeth projecting from the core back; an insulator covering an upper and lower surface of each magnetic pole tooth of the stator core; and coils defined by a conducting wire wound around a separate one of the magnetic pole teeth with the insulator intervening therebetween. The insulator includes at least one protruding portion. An upper end of each protruding portion is arranged at an axial level higher than an axial level of a lower surface of a circuit board. The circuit board includes at least one penetration portion each of which is defined by a cut or a hole, and in each of which a corresponding one of the at least one protruding portion is arranged.

Abstract: A motor includes a stationary unit and a rotary unit arranged to rotate with respect to the stationary unit about a center axis extending in an up-down direction. The rotary unit includes a substantially cylindrical rotor holder, a plurality of magnets disposed radially inward of the rotor holder and arranged along a circumferential direction, and a non-magnetic magnet holder fixed to an inner circumferential surface of the rotor holder and arranged to hold the magnets. The magnet holder includes a plurality of pillars extending in the up-down direction and arranged to position the magnets in the circumferential direction, and a first ring and a second ring arranged to interconnect the pillars at positions spaced apart in the up-down direction. The first ring is positioned radially outward of the second ring, and the second ring is positioned radially inward of outer circumferential surfaces of the pillars.

Abstract: A motor includes a rotating portion including a shaft and a rotor, and a stationary portion including a stator and a magnetic sensor. The magnetic sensor is located above the rotor to detect the rotational position of the rotor. The rotor includes a tubular rotor core defined by laminated steel sheets; a rotor magnet including an upper end surface at an axial level higher than an axial level of an upper end surface of the rotor core; and a rotor holder including a ferromagnetic body, and above the rotor core and radially inside of the rotor magnet. Each of the rotor core and an outer cylindrical portion of the rotor holder is in contact with the rotor magnet or opposite to the rotor magnet with a gap intervening therebetween.

Abstract: An inner-rotor motor includes a shaft, a rotor magnet, a stator, a housing including a housing tubular portion extending along a rotation axis, a cap, and a bearing portion. The cap is located above the housing, and includes a cap bottom portion and a cap tubular portion which extends downward from the cap bottom portion. A core back of the stator includes a tubular outer circumferential surface including a plurality of stator contact portions in contact with the housing tubular portion. The stator contact portions are spaced from one another in a circumferential direction. The cap tubular portion includes a plurality of cap contact portions in contact with the housing and spaced from one another in the circumferential direction. At least one of the cap contact portions is located at a circumferential position different from a circumferential position of each stator contact portion.

Abstract: A motor includes a shaft supported by upper and lower bearings and rotatable about an axis; a rotor magnet fixed to the shaft; a stator arranged radially outside and opposite to the rotor magnet with a gap therebetween; an upper bracket holding the upper bearing; and a lower bracket holding the lower bearing. The upper bracket includes an upper cylindrical cover press fitted to a stator core from above, an upper bearing holding portion, and a top plate portion arranged to join the upper cylindrical cover and the upper bearing holding portion. The lower bracket includes a lower cylindrical cover press fitted to the stator core from below, a lower bearing holding portion, and a bottom plate portion arranged to join the lower cylindrical cover and the lower bearing holding portion. Each of the upper and lower brackets is fixed to the stator core through press fitting.

Abstract: A motor includes an armature arranged radially outside a rotor magnet, and a casing configured to fix the armature and hold upper and lower bearings configured to rotatably support a shaft at a radial center thereof. The armature includes a stator core, an insulator arranged to cover the stator core, coils each of which is defined by a conducting wire wound around a separate one of magnetic pole teeth with the insulator intervening therebetween, and passage lines each of which is arranged circumferentially between adjacent ones of the magnetic pole teeth to electrically connect one of the coils and another one of the coils with each other. The insulator includes magnetic pole tooth insulating portions arranged to cover a separate one of the magnetic pole teeth; and a core back insulating portion integral with each magnetic pole tooth insulating portion.

Abstract: In an inner-rotor motor, an armature includes a stator core including an annular core back and magnetic pole teeth projecting from the core back; an insulator covering an upper and lower surface of each magnetic pole tooth of the stator core; and coils defined by a conducting wire wound around a separate one of the magnetic pole teeth with the insulator intervening therebetween. The insulator includes at least one protruding portion. An upper end of each protruding portion is arranged at an axial level higher than an axial level of a lower surface of a circuit board. The circuit board includes at least one penetration portion each of which is defined by a cut or a hole, and in each of which a corresponding one of the at least one protruding portion is arranged.

Abstract: A motor includes a shaft, a rotor magnet, an armature, an upper bracket, a lower bracket, and a fixing member. An insulator includes magnetic pole tooth insulating portions, each of which covers a separate one of magnetic pole teeth, and a core back insulating portion configured to cover at least portions of upper and lower end surfaces of a core back. A stator core includes a fixing member arranging portion. The core back insulating portion includes a core back insulating projecting portion configured to project in an axial direction away from a surface covering the core back, and including a radially inner surface located radially inward of a radially inner end of the fixing member arranging portion. The core back insulating projecting portion includes a cut portion at a position radially opposed to the fixing member.