Abstract: A magnetic bearing (20) comprises: a rotor (22) to be supported for rotation about an axis (502); a stator (24) extending from a first end (30) to a second end (32) and comprising: one or more first permanent magnets (50); one or more second permanent magnets (52) of polarity substantially opposite to a polarity of the one or more first permanent magnets; and laminate teeth, encircled by radial windings (36A, 36B), axially between and extending radially inward of the one or more first permanent magnets on one side and the one or more second permanent magnets on the other side. The rotor comprises: one or more third permanent magnets (150); and one or more fourth permanent magnets (152) axially spaced from the one or more third permanent magnets.

Abstract: A cover member has a cylinder in the center of a cover part. A second sliding bearing is fastened to the cylinder. A rotary shaft protrudes upward from the cylinder without contact with the second sliding bearing. A first sliding bearing is a main bearing, which can radially support the rotary shaft, and the second sliding bearing is an auxiliary bearing which, when the rotary shaft is subjected to a load from the radial direction, bears that load in the radial direction together with the first sliding bearing. When the angle of inclination of the rotary shaft in the first sliding bearing is not maximal, the rotary shaft is supported only by the first sliding bearing, without the rotary shaft contacting the inside of the second sliding bearing. The amount of deformation of the rotary shaft when a load is applied to the rotary shaft from the radial direction and the rotary shaft first makes contact with the second sliding bearing is in a range from 0 to the maximum elastic deformation.

Abstract: A motor including a rotor and a stator that supports and rotates the rotor is disclosed. In accordance with an embodiment of the present invention, the motor includes a magnetic member, which is installed in the rotor such that the magnetic member faces the stator, and a stator magnetic body, which is a part of the stator and has a part corresponding to the magnetic member formed asymmetrically therein. In this way, the motor can prevent a whirling effect by installing the magnetic member, which forms a preload, even the motor is thinner.

Abstract: There is provided a spindle motor including a stator including a base member in which a stator core is fixedly installed, and a rotor including a rotor hub in which a driving magnet disposed to face the stator core is installed, wherein the driving magnet is installed on a magnet mounting part provided in the rotor hub so that the magnetic center thereof in an axial direction is disposed in a position higher than that of the magnetic center of the stator core in the axial direction in order to generate force directed in a downward axial direction by interaction with the stator core, and the stator core is formed of a soft magnetic material and includes protrusion parts formed at a front end portion thereof disposed to face the driving magnet and extended therefrom in the axial direction.

Abstract: A spindle motor according to an aspect of the invention may include: a base on which a sleeve is mounted; a rotor bound together with a shaft rotatably mounted on the sleeve and rotating by electromagnetic interaction with the stator; a pulling plate mounted on the base to generate a magnetic force in a rotary axis direction of the rotor; and an escape portion provided on the base at a position corresponding to the pulling plate and providing a space into which an adhesive may escape when bonding the pulling plate.

Abstract: Disclosed herein is a spindle motor in which the center of a main magnet configuring a rotor is positioned at a position higher than that of the center of a core configuring an armature, such that magnetic force generated in the main magnet acts downwardly, thereby easily preventing the floating of the rotor.

Abstract: Disclosed herein is a spindle motor. The spindle motor includes a main magnet formed to have an asymmetrical cross section without a pulling magnet according to the prior art that has been installed on an upper end of a core in order to prevent floating of a rotor, such that the main magnet may prevent the floating of the rotor instead of the pulling magnet.

Abstract: There is provided a pulling plate for a spindle motor, the pulling plate including: a body having a circular ring shape; and a plastic deformation part protruding upwardly from the body and plastically deformed when being mounted. Since the pulling plate is installed in the base member by deforming the plating deformation part, a coupling strength between the pulling plate and the base member may be improved. In addition, since the pulling plate may be installed in the base member only through the deformation of the plastic deformation part, an amount of deformation may be reduced. Further, contamination generated in the case that the puling plate clips the base member may be reduced as compared to a case in which the entire pulling plate is press-fitted into the base member.

Abstract: There is provided a base assembly for a motor, the base assembly including: a base supporting rotation of a rotating member of the motor; and a pulling plate provided to the base to thereby prevent excessive floating of the rotating member, wherein the pulling plate includes a body part not in contact with the base and an extension part extended from the body part to thereby contact the base.

Abstract: Disclosed herein are an electromagnetic module for a spindle motor including a shaft and a spindle motor having the same. The electromagnetic module includes: an armature including a core and a coil wound around the core; and a magnet facing the armature, wherein the magnet is provided with a protrusion part disposed over the core. The spindle motor includes: a rotor part including a shaft, a hub, and a magnet; a stator part including a sleeve rotatably supporting the shaft, a base having the sleeve coupled thereto, and an armature facing the magnet, fixedly coupled to the base, and including a core and a coil; and a fluid dynamic bearing part formed between the rotor part and the stator part by being filled with oil, wherein the magnet is provided with a protrusion part disposed over the core.

Abstract: There is provided a spindle motor including: a holder having a motor shaft system mounted thereon and including a stator providing rotational driving force to a rotating member; a first pulling magnet mounted on an upper portion of an outer edge of the stator in a radial direction; and a second pulling magnet mounted on a lower portion of the rotating member and preventing excessive floating of the rotating member due to attractive force between the first and second pulling magnets.

Abstract: There are provided a base assembly for a motor and a fan motor including the same. The base assembly includes; a holder including a shaft system of the motor mounted therein and a stator for providing rotational driving force to a rotating member; an extension member mounted on the holder and extended to an upper portion of the stator; and an attractive magnet positioned above the extension member in an outer diameter direction to thereby prevent excessive floating of the rotating member.

Abstract: Disclosed herein is a spindle motor including: a rotor including a shaft, a hub, and a magnet; a stator including a sleeve rotatably supporting the shaft, a base having the sleeve coupled thereto, and an armature facing the magnet, fixedly coupled to the base, and including a core and a coil; and a fluid dynamic bearing part formed between the rotor and the stator by being filled with oil, wherein the stator further includes a pulling plate disposed to face the magnet in an axial direction of a shaft, coupled to the base, and protruded upwardly toward the core in a axial direction of a shaft.

Abstract: The present invention provides a flywheel apparatus for use as an energy storage system, the apparatus comprising: a housing unit having a base; a flywheel assembly mounted within the housing unit, the assembly comprising a flywheel supported by a rotatable axle arranged to enable rotation of the assembly within the housing, the axle defining an axis of rotation; stabilising means located within the housing unit arranged to stabilise rotation of the flywheel assembly about the rotation axis; and levitation means arranged to levitate the flywheel assembly above the base of the housing unit, in order to create a clearance between the flywheel assembly and the base of the housing unit.

Abstract: In a brushless motor comprising: a stator S having a stator core 14 arranged surrounding a bearing part, and a core cover 15 arranged on a surface of the stator core; and a rotor R having a rotational shaft 22, a rotor case 21, and a drive magnet 25, the core cover 15 itself has an integrally formed rotor retaining part that enters a groove 22a in the rotational shaft 22.

Abstract: A spindle motor is provided. The spindle motor includes a base, a bearing housing, a bearing, a rotation shaft, a stator, a bushing, and a rotor. The bearing housing is installed on the base. The bearing is fixed inside the bearing housing. The rotation shaft is installed to be supported by and rotate on the bearing. The stator is disposed around the bearing housing. The bushing is coupled to the rotation shaft. The rotor is coupled to the bushing to rotate through interaction with the stator.

Abstract: There are provided a motor and a recording disc driving device, which may minimize a frictional force between a shaft and a bearing assembly to enable a rotor to be readily rotated at the time of initial movement of the rotor. The motor may include: a bearing assembly including a shaft rotatably fastened to the bearing assembly; a base fastened to a lower end portion of the bearing assembly; a stator fastened to the base and including a winding coil; and a rotor case fastened to an upper end portion of the shaft, and including a magnet fastened to the rotor case to be positioned to face the winding coil, wherein the magnet is fastened to the rotor case in such a manner as to be protruded towards a lower portion of the rotor case so that a magnetic force due to an eddy current generated in the base is increased.

Abstract: A spindle motor is provided. The spindle motor includes a base, a bearing housing, a bearing, a rotation shaft, a stator, a bushing, and a rotor. The bearing housing is installed on the base. The bearing is fixed inside the bearing housing. The rotation shaft is installed to be supported by and rotate on the bearing. The stator is disposed around the bearing housing. The bushing is coupled to the rotation shaft. The rotor is coupled to the bushing to rotate through interaction with the stator.

Abstract: A motor includes a bearing mechanism, a stationary unit including a stator arranged radially outwards of the bearing mechanism, and a rotary unit supported by the bearing mechanism at the upper side of the stationary unit for rotation about a center axis with respect to the stationary unit. The rotary unit includes a substantially cylindrical closed-top rotor yoke having a cover portion arranged to cover the stator. The bearing mechanism includes a substantially cylindrical closed-bottom bush formed by a press work, a sleeve fixed inside the bush and provided with an upper portion protruding beyond the bush and a shaft inserted into the sleeve. An upper end of the bush is lower than or flush with an upper end of the stator in a direction parallel to the center axis.

Abstract: A motor includes a stationary unit, a bearing mechanism, a rotary unit, and a chucking device. The rotary unit includes a rotor yoke provided with a cover portion extending around the chucking device and designed to allow the storage disk to be directly or indirectly mounted thereto and a removal-preventing member fixed to the cover portion to prevent removal of the rotary unit from the stationary unit. The removal-preventing member made of metal. The removal-preventing member includes a removal-preventing portion, an upper fixing portion having a plurality of upper protrusions inserted into the through-holes of the cover portion and bent toward the upper surface of the cover portion, and a lower fixing portion making direct or indirect contact with the lower surface of the cover portion and cooperating with the upper fixing portion to fix the position of the removal-preventing portion in a direction parallel to the center axis.

Abstract: A motor including a rotor and a stator that supports and rotates the rotor is disclosed. In accordance with an embodiment of the present invention, the motor includes a magnetic member, which is installed in the rotor such that the magnetic member faces the stator, and a stator magnetic body, which is a part of the stator and has a part corresponding to the magnetic member formed asymmetrically therein. In this way, the motor can prevent a whirling effect by installing the magnetic member, which forms a preload, even the motor is thinner.

Abstract: The spindle motor includes a rotating shaft, a rotor cover which is secured to the rotating shaft and rotates the rotating shaft, a bearing for rotatably supporting the rotating shaft, a holder for holding the bearing, and a holding magnet which is directly mounted to an inner wall of the rotor cover. In this case, the holding magnet is positioned above the bearing to prevent oil from being discharged from the bearing to the outside.

Abstract: A permanent magnetic motor having a magnetic axial bearing and one or more fluid bearings, wherein a stator unit is disposed on a baseplate, the stator unit being disposed opposite a magnet ring made up of permanent magnets and being separated from the magnet ring by an air gap, and the magnet ring is fixed to the inside circumference of a circumferential hub that is supported with respect to a bearing bush by means of the fluid bearings via a shaft, and at least one fluid dynamic axial bearing is preloaded with an axial attractive force component that is at least partly generated by a ferromagnetic pull ring that is fixed to the baseplate and disposed below the magnet ring and permeated by its field lines, characterized in that, seen magnetically, the stator unit is centered with respect to the magnet ring and has no significant axial offset and that the pull ring has no or only relatively low electrical conductivity at high magnetic permeability.

Abstract: An electric motor includes a stator portion, a rotor portion, and a bearing mechanism, wherein the rotor portion includes a rotor holder having a substantially cylindrical shape with a closed end, and a field magnet fixed to an inner circumference of the rotor holder; the stator portion includes a stator, a base portion to which the stator is fixed, and a magnetic member; and the magnetic member includes a cylindrical portion having a substantially cylindrical shape into which a lower end portion of an insulator of the stator is inserted, the lower end portion being a portion of an outer portion of the insulator and opposing the base portion, and a flat portion having a substantially annular shape which spreads outwardly in a radial direction from a lower edge of the cylindrical portion and opposes a lower edge of the field magnet.

Abstract: A magnetic field element includes magnetic field portions and a coupling portion and is rotatable on a rotation axis along a given direction. Each magnetic field portion includes a magnet and magnetic plates. The magnet includes first and second pole faces having different polarities from each other in the given direction. The magnetic-material plates are provided on the first and second pole faces. The magnetic field portions are annularly arranged along a circumferential direction around the rotation axis and spaced in the circumferential direction from one another. The coupling portion is made of a non-magnetic material and couples the magnetic field portions to one another.

Abstract: A thrust yoke is fixed into a second recessed portion of a base with adhesive. The second recessed portion has a first surface to be in contact with the bottom surface of the thrust yoke, and a second surface axially opposing the bottom surface of the thrust yoke with a gap therebetween. The thrust yoke has a bent portion at its radial end. The bent portion is bent downward. The thrust yoke also has a protruding portion extending downward from the bent portion. The protruding portion axially opposes the second surface of the second recessed portion of the base with a gap therebetween.

Abstract: A permanent magnetic motor having a magnetic axial bearing and one or more fluid bearings, wherein a stator unit is disposed on a baseplate, the stator unit being disposed opposite a magnet ring made up of permanent magnets and being separated from the magnet ring by an air gap, and the magnet ring is fixed to the inside circumference of a circumferential hub that is supported with respect to a bearing bush by means of the fluid bearings via a shaft, and at least one fluid dynamic axial bearing is preloaded with an axial attractive force component that is at least partly generated by a ferromagnetic pull ring that is fixed to the baseplate and disposed below the magnet ring and permeated by its field lines, characterized in that, seen magnetically, the stator unit is centered with respect to the magnet ring and has no significant axial offset and that the pull ring has no or only relatively low electrical conductivity at high magnetic permeability.

Abstract: A suction ring is fixed to a motor base and is provided with an outer circumferential section having a first outer diameter that is smaller than an inner diameter of a wall section of the motor base. A plurality of protruded sections each have a second outer diameter larger than the inner diameter of the wall section of the motor base and protrudes outward in a radial direction from the outer circumferential section of the suction ring. The plurality of protruded sections of the suction ring are press fitted into a wall section of the motor base and secures the suction ring to the motor base. One surface of the suction ring coincides with a bottom surface of the ring magnet covering a whole range of a projected area of the ring magnet that is projected onto the surface of the suction ring.

Abstract: An apparatus to deliver air to a patient through a mask, including an air blower (33) where the impeller (5) is rotated by an electromotor including a rotor (3) and a stator (8), the stator having at least three sectors (8a, 8b and 8c), the rotation of the rotor being enabled by changes of the polarity of the sectors, each sector's polarity configuration constituting one step of the rotor's rotation, the apparatus including a driving unit (36) changing the sectors' polarity when the rotor is at its optimal position, so that the efficiency of the electromotor enables the blower to have fast accelerations and decelerations within one patient's breath step, the breath step consisting of one inspiration and one expiration.

Abstract: A motor. The motor includes a stator, a rotor, a top magnetic structure, and a bottom magnetic structure. The stator is disposed in a frame. The rotor is also disposed in the frame, corresponding to the stator. The rotor comprises a shaft, extended axially from the rotor. The shaft does not contact the stator or the frame. The bottom magnetic structure is at the bottom of the frame. The top magnetic structure is on the top of the frame. The top and bottom magnetic structures are opposite to each other in an axial direction. Magnetic attraction generated between the first magnetic structure and the second magnetic structure attracts and positions the shaft therebetween such that the first magnetic structure, the second magnetic structure, and the shaft are coaxially aligned.

Abstract: Embodiments of the present invention effectively control, by a simple structure, floating of a rotor of a fluid dynamic bearing motor mounted in a hard disk drive. In one embodiment, a base is formed of a magnetic material. The attractive force caused by the magnetic force acts between a bottom of the base and a magnet unit that is constituted of a rotor magnet and a back yoke. This makes it possible to attract a rotor to the base against the buoyant force produced by a thrust bearing, and thereby to effectively control the rotation of the rotor. On the bottom of the base, at a position facing the magnet unit, a convex part protruding from the inner surface of the base is formed in a ring-shape. Adjusting the height, or the width, of the convex part makes it possible to control the magnetic back pressure applied to the rotor.

Abstract: A prestressing structure for rotationally balancing a motor includes a motor stator, a motor rotor, a magnetically conductive member and a balancing magnet. The motor stator has an axial hole and an axial tube extending therethrough. An end of the axial tube provides with the magnetically conductive member. The motor rotor has an inner surface and a shaft seat mounted thereon. A top portion of the shaft seat provides with the balancing magnet which has at least one surface successively attracting at least one surface of the magnetically conductive member for stabilizing rotary movement of the motor.

Abstract: A capstan motor for a magnetic recording and reproducing apparatus includes a stator having a coil disposed on outer peripheral direction thereof, and a rotor having a magnet to correspond to coil and rotated by an electromagnetic interaction between the coil and the magnet. A capstan shaft is rotated integrally with the rotor, is fixed on the rotor and installed so that one side of the capstan shaft is cohered with a pinch roller taking a tape therebetween to drive the tape with the pinch roller. The magnet has a predetermined shape and is provided to apply magnetic force of the magnet eccentrically for an electromagnetic force generated on the coil so that a predetermined thrust can be applied to the capstan shaft toward one direction between upper and lower directions of the shaft direction.

Abstract: A rotational balancing structure for an A.C. motor comprises a casing having an axle seat for rotatably holding a shaft of a rotor. A balancing sheet and a stator are mounted in the casing. The stator comprises plural stacked silicon steel plate wound around by a winding. An insulating ring is mounted to an end of the stator. Each of the stator and the insulating ring has a central hole. The rotor comprises an induction ring that is received in the central hole of the stator with an end face of the induction ring extending through the central hole of the stator for mutual attraction with the balancing sheet fixed on the casing.

Abstract: Vibration applied to a rotary shaft in an axial direction is suppressed when the rotary shaft is supported by a single hearing. A width dimension in a direction parallel with an axial direction of rotor-side magnetic poles of a permanent magnet unit is set to be larger than a width dimension in the direction parallel with the axial direction of stator-side magnetic poles. The rotor-side magnetic poles are fixed to a peripheral wall portion of a cup member such that the rotor-side magnetic poles completely face the stator-side magnetic poles and project toward a front side further than an end face of the stator-side magnetic poles on a motor support side. By using thrust formed of magnetic attracting force generated by decentering a magnetic center of the rotor-side magnetic poles and a magnetic center of the stator-side magnetic poles, the vibration of the rotary shaft in the axial direction is suppressed.