Abstract: A motor includes a shaft, a bearing for supporting the shaft rotatably, a rotor including a rotor frame to be mounted to the shaft along an axial direction of the shaft, a stator confronting an outer wall of the rotor via a space, and a washer disposed between the bearing and the rotor frame. On top of that, a step section forming a recess is provided to the rotor frame at a place where the washer confronts the rotor frame.

Abstract: There is provided a motor with an improved sleeve holder and base plate combining structure and an optical disc drive using the same. The motor according to the present invention includes a base plate having a plate shape; a sleeve holder including a cylindrical body part having a sleeve fastened thereinto and a flange part formed to be horizontally protruded in an outer-diameter direction from the lower end portion of the body part to surface-contact the upper surface of the base plate.

Abstract: A motor includes a base having a shaft tube. A rotor includes a shaft rotatably supported by a shaft supporting assembly in the shaft tube. The shaft includes a retaining groove. A stator is coupled to the shaft tube of the base and includes at least one limiting member. A distal end of the at least one limiting member is received in the retaining groove of the shaft and prevents disengagement of the shaft from the shaft supporting assembly. The at least one limiting member further includes a bottom facing the shaft supporting assembly. A gap is formed between the bottom of the at least one limiting member and a top portion of the shaft supporting assembly. The gap provides a space for deformation of the at last one limiting member so that the distal end of the at least one limiting member extends into the retaining groove.

Abstract: A bearing holder mounting structure which allows a motor to be manufactured with a small number of parts without needing complex processing, and such motor are provided. A rotor 1 having a pair of bearings 5A and 5B and a washer 28 mounted thereon is inserted into an opening portion 23a of a motor housing 7 such that a rotor member 11 of the rotor 1 is received in a receiving concave portion 23. A bearing holder 9 is disposed on a bottom wall portion 29a of a fitting recessed portion 29 such that a flange portion 37 of the bearing holder 9 abuts on the bottom wall portion 29a of the fitting recessed portion 29. A retaining fitting 33 is then pressed into the fitting recessed portion 29 such that six engaging pieces 41 are located at positions slightly deviated from positions of six lead-out groove portions 31.

Abstract: There are provided an adhesive resin composition for a hard disk drive (HDD) motor and a HDD motor fabricated by the using the same. The adhesive resin composition includes: 45 to 55 parts by weight of an urethane methacrylate oligomer, 35 to 45 parts by weight of hydroxylalkyl methacrylate, 1 to 3 parts by weight of an acrylic acid, 1 to 2 parts by weight of organic hydroperoxide, and 2 to 5 parts by weight of a photo initiator. The HDD motor may be fabricated using the adhesive resin composition for a HDD motor prepared by controlling contents of an UV curable adhesive and a primer to reduce generation of outgas, whereby improved reliable quality of the motor may be obtained.

Abstract: There are provided a base assembly for a motor having improved noise and vibrations generating prevention characteristics by reducing cogging torque generated by a stator core, and a motor including the same. The base assembly includes: a base member having a shaft system of the motor, mounted therein; a stator core mounted on the base member, provided to correspond to a magnet provided in a rotating member of the motor, and having a coil wound therearound, the coil generating electromagnetic force; a dummy core provided on an upper portion or a lower portion of the stator core to thereby reduce cogging torque; and a damping sheet interposed between the stator core and the dummy core.

Abstract: Disclosed herein is a spindle motor including: a shaft insertedly mounted so as to be perpendicular to an upper side portion; a sleeve receiving the shaft therein to thereby rotatably support the shaft and forming a space between the sleeve and the shaft to thereby be spaced apart from the shaft so as not to contact the shaft; a holder having the sleeve mounted in an inner portion thereof and having a lower portion mounted on an upper portion of a plate; and the plate integrally supporting lower portions of the shaft and the sleeve and including connecting parts connecting the holder and the plate to each other and fixing parts fixing positions of the holder and the plate so that a lower surface of the holder is coupled thereto.

Abstract: There is provided a motor formed to have a simple coupling structure between a base plate and a sleeve holder, thereby implementing a simple structure and reducing costs and processes taken for manufacturing the motor, and an optical disc drive using the same. To this end, the motor includes a base plate having at least one protrusion formed therein, and a sleeve holder having a body part, of which the shape is cylindrical and in which a sleeve is fitted, and a flange protrudingly formed from a lower end of the body part in such a manner as to make surface-to-surface contact with an upper surface of the base plate, wherein the flange is formed to have at least one insertion hole, through which the protrusion is inserted so that the sleeve holder is coupled to the base plate.

Abstract: A storage disk drive motor 12 includes a stator unit 2, a rotor unit 3, a shaft 41 arranged in a coaxial relationship with a center axis 9, a sleeve unit 22 including a flange portion 223, and a base member 21, having a through-hole, fixed to the sleeve unit 22 by caulking. The flange portion 223 includes a flange lower surface 223b making contact with an upper surface 21a of the base member 21 and a jut 24 protruding downwards from a radial inner side of the flange lower surface 223b. The jut 24 includes a first outer circumferential surface 241 opposed to the inner circumferential surface 21c of the base member 21, a second outer circumferential surface 242 positioned below the first outer circumferential surface 241, and a groove 243 radially inwardly indented from the first outer circumferential surface 241 and the second outer circumferential surface 242.

Abstract: A heat insulation structure for cooling fan includes a base, a blade hub, and a stator. The base has a ceramic bearing sleeve, which defines an axial inner space for receiving at least one bearing therein. The bearing has an axial shaft hole; and a heat insulating nanomaterial is applied between the bearing and the bearing sleeve. The blade hub has a plurality of blades and a rotor shaft provided thereon. The rotor shaft has an end connected to the blade hub and another end inserted in the shaft hole on the bearing. The stator is fitted around the bearing sleeve, and a heat insulating nanomaterial is applied between the stator and the bearing sleeve. The ceramic bearing sleeve and the heat insulating nanomaterial together protect the bearing against damage caused by heat produced by windings wound around the stator to thereby largely increase the lifetime of the cooling fan.

Abstract: A motor may include a rotation shaft, a drive magnet, a drive coil, a case body covering the drive coil, a slide bearing supporting the rotation shaft and movable in an axial direction, and a bearing holder holding the slide bearing movably in the axial direction through an inner peripheral face. The bearing holder is fixed to an opposite-to-output side end face of the case body and an entire bearing holder is disposed on an outer side of the case body and the case body has opening part having a bearing holding face for slidably supporting the slide bearing together with an inner peripheral face of the bearing holder. A part of the slide bearing is disposed in an inside of the case body and the slide bearing is slidably held by the inner peripheral face of the bearing holder and the bearing holding face of the case body.

Abstract: A motor assembly includes a flexible base mount having an axial tube, a rigid outer mounting shell member inserted into and retained to the axial tube by retaining and retained members disposed therebetween, a stator winding subassembly surrounding the outer mounting shell member and supported by resting on a surrounding ledge of the axial tube, a plug member engaging in a socket cavity of the outer mounting shell member, a flexible inner mounting shell member inserted into the outer mounting shell member, a rotating shaft of a rotor subassembly received in the inner mounting shell member and rotatably born by an antifriction bearing, and an upper positioning ring resting on the bearing. Leakage of lubricant and deformation of the inner mounting shell member can be prevented.

Abstract: A motor is disclosed. The motor can include: a rotor equipped with a shaft; a base, in which a housing hole is formed and which includes a housing support portion protruding along a periphery of the housing hole; a housing, which may be inserted in the housing hole to be supported by the housing support portion and in which a through-hole is formed so that the shaft may be inserted in one side of the through-hole; and a rotor support, which may be inserted into the other side of the through-hole and in which a support indentation is formed to rotatably support the shaft. This motor can be manufactured by a simple process at a low manufacturing cost.

Abstract: A spindle motor includes a shaft arranged to extend in an axial direction, and a base portion arranged to define a portion of a housing, and including a through hole in which the shaft is inserted. A fixing region is defined between an inner circumferential portion of the base portion and a lower portion of the shaft. The fixing region includes a press-fitting region and an adhesion region defined on a lower side of the press-fitting region and in which a seal gap is defined between the inner circumferential portion of the base portion and the lower portion of the shaft. The seal gap is arranged to gradually decrease in radial width with increasing height. The seal gap is arranged to include an adhesive arranged therein over an entire circumference thereof.

Abstract: A spindle motor is disclosed, whereby a bearing is fixed at a support portion of a base to dispense with a bearing housing, thereby reducing the number of parts, shortening an assembly process and reducing the manufacturing cost. Furthermore, the bearing is fixedly inserted into the support portion integrally formed with the base to allow the bearing to maintain a perpendicularity relative to the base, whereby a rotation shaft supported by the bearing can maintain a perpendicularity, thereby reducing noise and vibration.

Abstract: There is provided a motor including a sleeve rotatably supporting a shaft; a sleeve holder having the sleeve inserted thereinto and including fixing parts; and a base member including fixing counterparts corresponding to the fixing parts of the sleeve holder and fixedly coupled to the sleeve holder, wherein the sleeve holder and the base member have guide parts and guide counterparts respectively provided therein, the guide parts and guide counterparts having corresponding shapes and guiding the sleeve holder to a mounting position thereof.

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 disclosed, wherein the spindle motor is formed at an outer periphery of a first protruder of a bearing housing having a gap relative to the inner periphery of the coupling hole of a base with a guide portion contacting an inner periphery of a coupling hole, whereby, the bearing housing is not moved on the base by the guide portion, and whereby the bearing housing is always coupled to a predetermined area of the base, such that when the base assembled with parts is coupled to the product, the parts are always positioned at a predetermined area of the product, thereby improving product reliability.

Abstract: A motor assembly includes a flexible base mount having an integrally formed axial tube, support ledges disposed on the axial tube to axially support a stator disposed on the axial tube to be firmly engaged with the stator for further ensuring immobility, a flexible mounting shell member axially insertable into the axial tube and having a receptacle cap at a lower end thereof, retaining and retained members disposed between the mounting shell member and the axial tube to guard relative movement therebetween, and an antifriction bearing disposed in the mounting shell member to bear a revolving shaft of a rotor. All the constituted components can be standardized and modularized. With such simple construction, the motor assembly can be easily assembled.

Abstract: This rotating electric machine is so formed that the length from an end portion of a rotor core closer to a rotating shaft support portion to a portion first coming into contact with the rotating shaft support portion when a rotating shaft portion is inserted into the rotating shaft support portion is larger than the length from an end portion of the rotating shaft support portion closer to a stator to an end portion of a stator core opposite to the rotating shaft support portion.

Abstract: There are provided a motor in which a coupling structure between a sleeve holder and a base plate is improved to thereby reduce manufacturing costs and manufacturing process of the motor, and to an optical disc drive using the same. The motor may include a base plate including at least one protrusion supporting part formed therein; and a sleeve holder including a cylindrical shaped body part to which a sleeve is fastened in an inside of the sleeve holder, an extension part protruded such that an outer diameter is extended along an outer circumferential surface of the body part, and a flange part vertically protruded in an outer diameter direction from a lower end portion of the extension part so as to make surface contact with an upper surface of the base plate, wherein the sleeve holder is fastened to the base plate while an outer circumferential surface of the protrusion supporting part is brought into contact with an inner circumferential surface of the extension part.

Abstract: There is provided a motor formed to have a simple coupling structure between a base plate and a sleeve holder, thereby implementing a simple structure and reducing costs and processes taken for manufacturing the motor, and an optical disc drive using the same. To this end, the motor includes a base plate having at least one protrusion formed therein, and a sleeve holder having a body part, of which the shape is cylindrical and in which a sleeve is fitted, and a flange protrudingly formed from a lower end of the body part in such a manner as to make surface-to-surface contact with an upper surface of the base plate, wherein the flange is formed to have at least one insertion hole, through which the protrusion is inserted so that the sleeve holder is coupled to the base plate.

Abstract: There is provided a motor with an improved sleeve holder and base plate combining structure and an optical disc drive using the same. The motor according to the present invention includes a base plate having a plate shape; a sleeve holder including a cylindrical body part having a sleeve fastened thereinto and a flange part formed to be horizontally protruded in an outer-diameter direction from the lower end portion of the body part to surface-contact the upper surface of the base plate.

Abstract: There is provided a motor and an optical disc drive using the same, more particularly, a motor having an improved coupling structure between a rotor and a stator, and an optical disc drive using the same. The motor includes: a shaft; a sleeve supporting the shaft so as to be rotatable; a stator coupled to an outer circumferential surface of the sleeve and extended outwardly in an outer diameter direction of the sleeve; and a base plate coupled to the outer circumferential surface of the sleeve under the stator and supporting the stator.

Abstract: A spindle motor is disclosed, the spindle motor including a bearing assembly including a first floor plate, a first lateral plate extended from an upper edge of the first floor plate, a second lateral plate formed by being protruded from the first floor plate to a direction facing a bottom surface, a bearing housing including the second floor plate and a bearing formed with a rotation shaft hole by being accommodated in the bearing housing; a base plate formed with a burring unit coupled to a periphery of the first lateral plate; a stator including a core coupled to the periphery of the first lateral plate and a coil wound on the core; a rotation shaft inserted into the rotation shaft hole of the bearing; a rotor including a yoke coupled to the rotation shaft and a magnet arranged on the yoke to face the core; an adhesive member arranged at a space formed by the first floor plate, the second floor plate and the burring unit; and a strength reinforcement member including a body fixed to a bottom surface of the

Abstract: The present invention relates to a motor, particularly, to a spindle motor and a method of manufacturing the same, in which a base plate is integrated with a bearing housing an insert molding or insert injection method at the same time when the bearing housing is made of resin, thereby being capable of securing the verticality of a bearing and a pivot assembled with the bearing housing and the base plate, reducing the manufacturing cost, and improving the efficiency of a manufacturing process. The motor of the present invention includes a rotor, a pivot configured to have one end connected to the rotor, a bearing configured to rotatably support the outer circumferential face of the pivot, and a bearing housing made of resin and configured to comprise a first concave groove for receiving the bearing and a second concave groove for supporting the other end of the pivot.

Abstract: There are provided a motor and a disk driving device equipped with the motor. The motor may include a core on which a coil is wound, a rotor having a magnet generating an electromagnetic force through an interaction with the coil, and rotating a shaft, a sleeve housing including an inner diameter part to which a sleeve supporting the shaft is press-fitted, a core seating part extended outside in an outer diameter direction from the inner diameter part, and an outer diameter part extended to an axial lower side of the sleeve from the core seating part, and a base plate including a strength reinforcement part formed therein, the strength reinforcement part being brought into contact with the outer diameter part and at least one part of an inner surface of the core seating part.

Abstract: A motor assembly includes a flexible base mount having an integrally formed axial tube, support ledges disposed on the axial tube to axially support a stator disposed on the axial tube to be firmly engaged with the stator for further ensuring immobility, a flexible mounting shell member axially insertable into the axial tube and having a receptacle cap at a lower end thereof, retaining and retained members disposed between the mounting shell member and the axial tube to guard relative movement therebetween, and an antifriction bearing disposed in the mounting shell member to bear a revolving shaft of a rotor. All the constituted components can be standardized and modularized. With such simple construction, the motor assembly can be easily assembled.

Abstract: There is provided a motor including a sleeve supporting a shaft; a sleeve holder allowing the sleeve to be fixed to an inner circumferential surface thereof and having a coupling rack protruding downwardly from a bottom surface in an axial direction; and a base plate having a sleeve holder insertion hole provided therein such that the sleeve holder insertion hole has a curvature defined by an inner circumferential surface thereof, in contact with an outer circumferential surface of the coupling rack of the sleeve holder, and a bottom surface thereof, in contact with a coupling portion of the coupling rack.

Abstract: Disclosed herein is an assembly structure of a bearing and a holder of a brushless DC motor. The bearing is forcibly fitted into a hollow space formed through the holder. A beveled mouth edge is formed on the upper end of the circumferential inner surface of the holder through which the bearing enters the holder. Therefore, the assembly structure can enhance the workability of the process of assembling the bearing with the holder.

Abstract: A heat insulation structure for cooling fan includes a base, a blade hub, and a stator. The base has a ceramic bearing sleeve, which defines an axial inner space for receiving at least one bearing therein. The bearing has an axial shaft hole; and a heat insulating nanomaterial is applied between the bearing and the bearing sleeve. The blade hub has a plurality of blades and a rotor shaft provided thereon. The rotor shaft has an end connected to the blade hub and another end inserted in the shaft hole on the bearing. The stator is fitted around the bearing sleeve, and a heat insulating nanomaterial is applied between the stator and the bearing sleeve. The ceramic bearing sleeve and the heat insulating nanomaterial together protect the bearing against damage caused by heat produced by windings wound around the stator to thereby largely increase the lifetime of the cooling fan.

Abstract: A bearing holder and a spindle motor having the same are disclosed. The bearing holder in accordance with an embodiment of the present invention can include a body, which has an insertion hole formed therein such that a bearing is inserted into the insertion hole, a first supporting protrusion, which is protruded downward from a bottom surface of the body along a circumference of the insertion hole, and a first bent indentation, which is formed on an inner circumferential surface of the first supporting protrusion such that the first supporting protrusion is bent toward an inner side. Thus, unnecessary deformation in the bearing holder can be prevented while the bearing holder is coupled to a base plate. Moreover, since the bearing holder forms an accurate positional relationship with respect to the base plate, noise and vibration can be prevented from occurring during the operation of the motor.

Abstract: A spindle motor is disclosed, wherein the spindle motor is integrally formed by a one side-exposed cylindrical bearing housing by pressing a metal sheet plate to save material costs and to simplify an assembly process of constituent elements, whereby the manufacturing cost can be reduced, and a bearing housing is press-fitted or bonded to a base without caulking process to make a perpendicularity of the bearing housing against the base accurate, whereby a perpendicularity of a rotation shaft against the base is also accurate, and whereby noise and vibration are reduced, and the integral formation of the bearing housing inhibits oil discharged from the bearing from leaking toward a lower surface of the bearing housing, thereby prolonging the life of the product.

Abstract: A bearing holder mounting structure which allows a motor to be manufactured with a small number of parts without needing complex processing, and such motor are provided. A rotor 1 having a pair of bearings 5A and 5B and a washer 28 mounted thereon is inserted into an opening portion 23a of a motor housing 7 such that a rotor member 11 of the rotor 1 is received in a receiving concave portion 23. A bearing holder 9 is disposed on a bottom wall portion 29a of a fitting recessed portion 29 such that a flange portion 37 of the bearing holder 9 abuts on the bottom wall portion 29a of the fitting recessed portion 29. A retaining fitting 33 Is then pressed into the fitting recessed portion 29 such that six engaging pieces 41 are located at positions slightly deviated from positions of six lead-out groove portions 31.

Abstract: In a motor, a bearing housing is made of a thermoplastic resin material. A bottom portion of the bearing housing includes a first large diameter portion, a small diameter portion, and a second large diameter portion. The first large diameter portion of the bearing housing is arranged on an upper surface of the base. An outer circumferential surface of the small diameter portion of the bearing housing is arranged radially opposite a side peripheral surface of a base hole. The second large diameter portion is arranged to be in direct contact with a lower surface of the base through caulking.

Abstract: A spindle motor is disclosed. The spindle motor includes a rotation shaft; a bearing rotatedly supporting the rotation shaft inserted therein; a bearing housing supporting the bearing and coupled to a stator; and a base plate coupled to the bearing housing, wherein the base plate has a reverse burring part projected from an upper part of the base plate along the outer surface of the bearing housing and burred from the upper surface of the bearing housing towards the lower surface opposite to the upper surface to support the outer surface of the bearing housing.

Abstract: A dynamoelectric machine, such as a totally enclosed fan cooled (TEFC) induction motor has a double-wall bearing housing heat shield that envelops and thermally isolates the bearing housing from the rest of the motor housing interior. The shield defines an air channel between the shield outer and inner walls. Optionally the air channel may be constructed to enable circulating air flow through a shield intake in communication with an air flow source, such as air ducted from the TEFC motor axial cooling fan. The air channel also defines an exhaust. Air flow within the air channel transfers heat out of the motor housing, lowering bearing housing operating temperature. Air flow rate may be varied in response to motor operational parameters.

Abstract: An inner rotor type motor includes a base having a pivotal portion. A stator is mounted to the base and includes a body and a coil unit engaged with the body and surrounding a hole of the body. A rotor includes a rotatable member, a shaft, and a permanent magnet. The rotatable member includes an engaging portion and a sidewall provided along a periphery of the engaging portion extending into the hole of the stator. The shaft includes an end coupled to the engaging portion. The other end of the shaft is coupled to the pivotal portion. The permanent magnet is mounted to an outer periphery of the rotatable member and aligned with the coil unit. The axial length of the shaft without permanent magnet mounted thereto can be reduced, allowing reduction of axial heights of the motor and a heat dissipating fan utilizing the motor.

Abstract: A spindle motor is disclosed, wherein the spindle motor includes a bearing housing coupled to the base plate, a bearing disposed in the bearing housing, and a rotating shaft inserted into the bearing to rotatably support to the bearing, a portion of bearing protruded from a circumferential face of the bearing is press-fitted into an inner face of the bearing housing.

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 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 spindle motor is disclosed. The spindle motor includes a bearing housing inserted therein by a bearing, a stator fixed at a periphery of the bearing housing, a rotation shaft rotatably supported by the bearing and formed thereunder with a hitching unit, a rotor fixed at the rotation shaft, and a support member arranged at a floor surface of the bearing housing to rotatably support the hitching unit and formed with a hitching protruder at which the hitching unit is hitched, whereby the number of constituent components is reduced to improve the assemblage.

Abstract: A motor is disclosed. The motor can include: a rotor equipped with a shaft; a base, in which a housing hole is formed and which includes a housing support portion protruding along a periphery of the housing hole; a housing, which may be inserted in the housing hole to be supported by the housing support portion and in which a through-hole is formed so that the shaft may be inserted in one side of the through-hole; and a rotor support, which may be inserted into the other side of the through-hole and in which a support indentation is formed to rotatably support the shaft. This motor can be manufactured by a simple process at a low manufacturing cost.

Abstract: A bearing device for a rotary motor 1 includes a stator 20 having provided thereon a coil 22 to which a current is fed; a rotor 30 rotating the inside of the stator 20 and having a rotor magnet 32; a motor shaft 33 having a screw portion meshing with a threaded aperture 31a provided within the rotor 30; a bearing support member 40 having a bearing 41 for the motor shaft 33 and molded of a thermoplastic resin; and a bearing side case 50 for housing the bearing support member 40 and molded of a thermoplastic resin, wherein an insert nut 46 is installed across the bearing side case and bearing support member to be united through outsert-molding.

Abstract: A spindle motor is disclosed, whereby a bearing is fixed at a support portion of a base to dispense with a bearing housing, thereby reducing the number of parts, shortening an assembly process and reducing the manufacturing cost. Furthermore, the bearing is fixedly inserted into the support portion integrally formed with the base to allow the bearing to maintain a perpendicularity relative to the base, whereby a rotation shaft supported by the bearing can maintain a perpendicularity, thereby reducing noise and vibration.

Abstract: A spindle motor is disclosed, wherein a coupling protruder of a stopper is penetrated into a rotor yoke by caulking. Therefore, no foreign objects that are generated from welding process are produced to inhibit the spindle motor from generating defects caused by the foreign objects and to improve the product reliability. Furthermore, the coupled protruder of the stopper is coupled to the rotor yoke by caulking, to make an assembly process simple. Still furthermore, the spindle motor according to the present invention is economical in that, in a case the coupled stopper is to be separated from the rotor yoke, the coupled stopper and the rotor yoke can be simply separated by cutting off a caulked portion of the coupled protruder, thereby allowing the rotor yoke to be re-used.

Abstract: A spindle motor component of hard disk with composite coating layer and a composite coating method hereof. The spindle motor component of hard disk includes a motor component base (1) and the composite coating layer which is coated on the base (1). The composite coating layer consists of an electrodepositing coating layer (2) and a spraying coating layer (3). The composite coating method includes a step of coating the electrodepositing coating layer (2) on the surface of the motor component base (1) and coating the spraying coating layer (3) on the electrodepositing coating layer (2), wherein the weight ratio of tin in the electrodepositing coating layer (2) is between 60 ppm to 300 ppm and the weight ratio of tin in the spraying coating layer (3) is no more than 50 ppm.

Abstract: A spindle motor includes a shaft arranged in an upward/downward direction along a central axis; a base member including a substantially cylindrical holder portion arranged around the central axis; a bearing unit arranged radially inward of the holder portion; and a rotating portion arranged above the base member to rotate about the central axis. The rotating portion preferably includes a mounting surface on which a disk is to be mounted. An adhesive containing an electrically conductive material and an adhesive containing an externally stimulated curing material and/or an anaerobic curing material are arranged in a clearance space defined between an inner circumferential surface of the holder portion and an outer circumferential surface of the bearing unit. The adhesive containing the electrically conductive material is arranged above the adhesive containing the externally stimulated curing material and/or the anaerobic curing material.

Abstract: A spindle motor is disclosed, wherein the spindle motor is formed at an outer periphery of a first protruder of a bearing housing having a gap relative to the inner periphery of the coupling hole of a base with a guide portion contacting an inner periphery of a coupling hole, whereby, the bearing housing is not moved on the base by the guide portion, and whereby the bearing housing is always coupled to a predetermined area of the base, such that when the base assembled with parts is coupled to the product, the parts are always positioned at a predetermined area of the product, thereby improving product reliability.

Abstract: An apparatus and method are provided for stiffening a base plate of a spindle motor to improve shock resistance and vibration response, and thereby increase reliability and performance of a disc drive memory system. A stiffener tab for stiffening a base plate is connected to the base plate, extends from the base plate, and is dimensioned to fit adjacent to a stator tooth. Stiffening of a base plate is especially useful in the case of stamped base plate designs that typically have uniform thickness, whereas cast base plate designs are formed with thicker sections. In an aspect, the present invention stiffens a motor cup portion of the base plate, and replaces stiffness lost by removal of material from the base plate to form holes for recessing a stator into the base plate. Axial and angular displacement of a spindle motor during shock events and vibration are decreased.