Abstract: A motor includes a holder, a rotor inside the holder with a shaft rotatable about a central axis, first and second bearings rotatably supporting the shaft, and a stator radially outside the holder. The holder includes a first holder, and a second holder extending upward from an upper end of the first holder. The stator is fixed to an outer peripheral surface of the first holder, and an outer ring of the first bearing is fixed to a lower end of an inner peripheral surface of the first holder. A portion of an outer ring of the second bearing is fixed to an inner peripheral surface of the second holder. The second holder is radially spaced from the stator core. A radial thickness of the second holder is less than a distance between an outer peripheral surface of the second holder and an inner peripheral surface of the stator core.

Abstract: A motor includes a rotor and a stator including a stator core including a core back and teeth, and a coil including a conductor including a wound portion wound around the teeth and an end extending from the wound portion. An axial position of the end is within a range from an end on one side to an end on the other side in an axial direction of the wound portion.

Abstract: A spindle motor includes a base, a shaft arranged on the base and extending in a vertical direction, a stator having a coil defined by a wound conductive wire and arranged on an upper surface of the base, and a rotor rotatably supported around the shaft. The base has a through hole that penetrates the base from the upper surface to a lower surface. The conductive wire is drawn out to the lower surface side through the inside of the through hole. The through hole is sealed by a sealing material. The through hole includes a columnar lower column body and a columnar upper column body. The lower column body is arranged on the lower surface side of the base. A cross-sectional area of the upper column body orthogonal to an axial direction is smaller than a cross-sectional area of the lower column body orthogonal to the axial direction.

Abstract: A stator core of a motor includes a disk portion and a pole-tooth yoke. The disk portion has a disk shape that extends in a radial direction around a central axis extending in a vertical direction. The pole-tooth yoke is located along a radially outer end of the disk portion. The pole-tooth yoke includes an annular portion and a pole tooth. The annular portion is connected to the radially outer end of the disk portion and extends in a circumferential direction. The pole tooth protrudes to one axial side from the annular portion. The disk portion and the pole-tooth yoke are defined by different members.

Abstract: A motor includes a rotor and a stator. The rotor can rotate about a central axis extending in an axial direction. The stator includes a stator core having an annular shape surrounding the central axis. The rotor includes a cylindrical portion, a first plate portion, a second plate portion, and a hole. The cylindrical portion is arranged on a radially outer side with respect to the stator and extends in the axial direction. The first plate portion is arranged on a first axial side with respect to the stator, and expands radially inward from a first axial end of the cylindrical portion. The second plate portion is arranged on a second axial side with respect to the stator, and expands radially inward from a second axial end of the cylindrical portion. The hole penetrates at least one of the cylindrical portion, the first plate portion, and the second plate portion.

Abstract: A rotor of a motor includes a cylindrical portion, a first plate portion, a second plate portion, and a side hole. The cylindrical portion is arranged on a radially outer side with respect to the stator and extends in the axial direction. The first plate portion is arranged on a first axial side with respect to the stator, and expands radially inward from a first axial end of the cylindrical portion. The second plate portion is arranged on a second axial side with respect to the stator, and expands radially inward from a second axial end of the cylindrical portion. The side hole penetrates the cylindrical portion in a radial direction. The stator holder has a holder through-hole. The holder through-hole is arranged on the radially inner side with respect to the stator and penetrates the stator holder in the axial direction.

Abstract: A spindle motor includes a base, a shaft arranged on the base and extending in a vertical direction, a stator having a coil defined by a wound conductive wire and arranged on an upper surface of the base, and a rotor rotatably supported around the shaft. The base has a through hole that penetrates the base from the upper surface to a lower surface. The conductive wire is drawn out to the lower surface side through the inside of the through hole. The through hole is sealed by a sealing material. The through hole includes a columnar lower column body and a columnar upper column body. The lower column body is arranged on the lower surface side of the base. A cross-sectional area of the upper column body orthogonal to an axial direction is smaller than a cross-sectional area of the lower column body orthogonal to the axial direction.

Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: A rotary drive apparatus that rotates while reflecting light emitted from a light source includes a motor, a flywheel supported by a rotating portion of the motor, and a plate-shaped mirror. The mirror is fixed to the flywheel with adhesives located at corner portions of the mirror and spaced apart from one another along end sides of the mirror. Thus, the mirror is fixed to the flywheel with the adhesives, and distortion of the mirror due to curing of the adhesives is reduced or prevented.

Abstract: A motor includes a stationary portion including a stator, and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion. The rotating portion includes a rotor hub portion extending in an annular shape around the central axis, a magnet including a pole surface radially opposite to the stator, a yoke fixed to a radial outside of the magnet, and connected to the rotor hub portion, a flywheel axially above the rotor hub portion, a first seal portion extending in an annular shape radially outside of the yoke; and a second seal portion extending in an annular shape radially outside of the first seal portion.

Abstract: A rotary drive apparatus rotates a flywheel that holds a mirror and a lens, and includes a motor and the flywheel. The flywheel is rotatable about a central axis extending in a vertical direction through the motor. The flywheel includes an accommodating portion in which the lens is located. The lens includes a base portion including a light-transmitting portion that allows reflected light to pass therethrough, a first contact portion contactable with the accommodating portion on one of upstream and downstream sides of the base portion with respect to the direction of travel of the reflected light, and a second contact portion contactable with the accommodating portion on another one of the upstream and downstream sides of the base portion with respect to the direction of travel of the reflected light. At least one of the first and second contact portions is a projection that projects from the base portion.

Abstract: A rotary drive apparatus is arranged to cause incoming light coming from a light source to be reflected, and rotate resulting reflected light, and includes a motor including a rotating portion arranged to rotate about a central axis extending in a vertical direction; and a flywheel supported by the rotating portion, and caused by the rotating portion to rotate about the central axis. The flywheel includes a lens arranged to allow the reflected light to pass therethrough; and a main body arranged to directly support the lens, or indirectly support the lens through a lens frame arranged to be in contact with at least a portion of a peripheral portion of the lens. At least one of the lens and the main body includes at least one projecting portion arranged to project toward another one of the lens and the main body. The other one of the lens and the main body includes at least one recessed portion into which the corresponding projecting portion is fitted.

Abstract: This rotary drive apparatus is arranged to cause incoming light coming from a light source to be reflected, and rotate resulting reflected light, and includes a motor including a rotating portion arranged to rotate about a central axis extending in a vertical direction; and a flywheel supported by the rotating portion, and caused by the rotating portion to rotate about the central axis. The flywheel includes a lens arranged to allow the reflected light to pass therethrough; a lens frame arranged to be in contact with at least a portion of a peripheral portion of the lens; and a main body arranged to support the lens or the lens frame. The main body includes an outer cylindrical portion arranged to define at least a portion of an outer circumferential surface of the main body, and an accommodating portion in which the lens frame is arranged. At least a portion of the lens frame and at least a portion of the main body are arranged to have a first adhesion portion therebetween.

Abstract: This rotary drive apparatus is arranged to rotate a mirror arranged to reflect incoming light coming from a light source, and includes a motor including a rotating portion arranged to rotate about a central axis extending in a vertical direction; and a flywheel including the mirror, and arranged to rotate while being supported by the motor. The flywheel further includes a tubular upper support member, and a lower support member having at least a portion thereof arranged below the upper support member. The mirror has at least a portion thereof arranged on the central axis, and is fixed while being in contact with at least a portion of a lower surface of the upper support member and at least a portion of an upper surface of the lower support member.

Abstract: This rotary drive apparatus is arranged to rotate a mirror which reflects incident light coming from a light source, and includes a motor including a rotating portion arranged to rotate about a central axis extending in a vertical direction; a flywheel including the mirror, and rotatably held by the rotating portion; and an impeller directly or indirectly fixed to the rotating portion. The impeller includes a tubular blade support portion arranged to extend along the central axis, and a plurality of blades arranged in a circumferential direction on an outer circumferential surface of the blade support portion. The blade support portion includes an impeller through hole arranged to pass through the blade support portion in an axial direction. The blades are arranged between the light source and the motor. The impeller through hole is arranged to define a light path over which the incident light travels.

Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: A pump a shaft portion arranged to extend in a vertical direction; a rotor portion arranged to surround an outer circumference of the shaft portion, and including a magnet; and a housing joined to the shaft portion, and arranged to contain the rotor portion. The housing includes a stator arranged opposite to the magnet; a rotor accommodating portion arranged to accommodate the rotor portion; and an inlet and an outlet each of which is arranged to pass through a portion of the rotor accommodating portion. A surface of at least one of the rotor portion, the shaft portion, and the rotor accommodating portion includes at least one first dynamic pressure groove arranged to support rotation of the rotor portion. A surface of at least one of the rotor portion and the rotor accommodating portion includes at least one second dynamic pressure groove arranged to transfer a fluid from the inlet to the outlet.