Patent application number | Description | Published |
20120014629 | Porous hydrodynamic bearing - There is provided a porous hydrodynamic bearing including a sleeve supporting a shaft, wherein the sleeve is formed of a sintered body containing at least one metal powder selected from a group consisting of SUS 304, SUS 430, and iron (Fe). In the sleeve formed of the sintered body containing at least one metal powder selected from the group consisting of SUS 304, SUS 430, and iron (Fe), surface pores and inner pores are not in communication with each other, whereby a leakage phenomenon of dynamic pressure may be reduced, as compared to a sleeve made of an alloy of Cu and Fe in which opened pores are formed. | 01-19-2012 |
20120104889 | Spindle motor - There is provided a spindle motor including: a sleeve including a hollow part having a shaft inserted thereinto and rotatably supporting the shaft; a thrust plate coupled to a lower portion of the shaft in an axial direction to thereby rotate together with the shaft; a cover plate coupled to a lower portion of the sleeve in the axial direction and covering the hollow part; and a step part stepped upwardly from a lower surface of the thrust plate in the axial direction so that the shaft and the thrust plate are easily coupled to each other and having surface roughness greater than that of other portions of the thrust plate. | 05-03-2012 |
20120153761 | Base assembly for motor and motor including the same - There is provided a base assembly for a motor, including: a base member having a shaft system of the motor mounted therein; a pulling plate bonded to the base member to prevent excessive floating of the motor; and at least one adhesive filling part formed in the pulling plate, and providing an adhesion space for an adhesive used for bonding the pulling plate to the base member to increase a contact area with the adhesive. | 06-21-2012 |
20120187789 | Hydrodynamic bearing assembly and motor including the same - There is provided a hydrodynamic bearing assembly including: a sleeve having a shaft inserted thereinto and supported thereby; a thrust plate coupled to one end of the shaft; an extension part formed at the thrust plate to be extended in an axial direction so as to be coupled to the shaft; and a coupling part formed at the shaft to contact an inner surface of the extension part so as to be coupled to the extension part. | 07-26-2012 |
20120311616 | SPINDLE MOTOR HAVING SHAFT WITH AXIALLY UPWARDLY OPENING INSERTION GROOVE - There is provided a spindle motor including a stator and a rotor, including: a shaft rotatably mounted with respect to the stator; and a rotor case coupled with the shaft and including a protruding part protruded axially downwardly from a lower portion of an inner diameter part thereof, wherein the shaft is provided with an outer wall part formed to have an insertion groove opened axially upwardly into which the protruding part is inserted so as to compensate for a reduction in adhesion due to a reduction in a thickness of the rotor case. | 12-06-2012 |
20120313470 | Motor - There is provided a motor including: a sleeve supporting a shaft and a thrust plate coupled to the shaft through oil; a hub operating together with the shaft and including a magnet coupled thereto; a base including the sleeve and a core coupled thereto, the core including a coil wound therearound; and a base cover coupled to the sleeve to thereby close a lower portion of the sleeve, wherein an interval between the sleeve and the hub is smaller than an interval between the thrust plate and the base cover in order to maintain a state of non-contact between the thrust plate and the base cover. | 12-13-2012 |
20130002079 | Motor - There is provided a motor including: a sleeve supporting a shaft; a hub operating together with the shaft and including a magnet; a base coupled to the sleeve and including a core having a coil wound therearound, the coil generating rotational driving force; and a magnetic flux increase space part formed to be enclosed between the magnet and the hub in order to increase magnetic flux density between the magnet and the core. | 01-03-2013 |
20130069491 | BASE ASSEMBLY FOR MOTOR AND MOTOR INCLUDING THE SAME - 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. | 03-21-2013 |
20130076179 | BEARING ASSEMBLY AND MOTOR INCLUDING THE SAME - There is provided a bearing assembly including: a sleeve supporting a shaft and including a circulation hole through which oil is circulated; a thrust plate coupled to the shaft and generating dynamic pressure in the oil; and a base cover coupled to the sleeve to thereby close a lower portion of the sleeve, wherein the oil passes through the circulation hole and is then supplemented between the thrust plate and the base cover in order to suppress bubblegeneration due to leakage of the oil filled between the thrust plate and the base cover at the time of rotation of the shaft. | 03-28-2013 |
20130076181 | BASE ASSEMBLY FOR MOTOR AND MOTOR INCLUDING THE SAME - There are provided a base assembly for a motor having improved noise and vibrations generating prevention characteristics by reducing a 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, disposed 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; and a dummy core coupled to the base member so as to be positioned on a lower portion of the stator core to thereby reduce cogging torque. | 03-28-2013 |
20130113316 | BEARING ASSEMBLY AND MOTOR INCLUDING THE SAME - There is provided a bearing assembly including: herringbone-shaped first and second fluid dynamic pressure parts formed in upper and lower portions of at least one of an outer peripheral surface of a shaft and an inner peripheral surface of a sleeve in an axial direction to be spaced apart from each other; and a first auxiliary fluid dynamic pressure part formed to be bent upwardly from an end portion of a lower groove of the herringbone-shaped first fluid dynamic pressure part in an axial direction. | 05-09-2013 |
20130127273 | HYDRODYNAMIC BEARING ASSEMBLY AND MOTOR INCLUDING THE SAME - There are provided a hydrodynamic bearing assembly and a motor including the same. The hydrodynamic bearing assembly includes: a sleeve having a shaft hole into which a shaft is rotatably inserted; and a hub fixed to an upper end of the shaft and extended in an outer radial direction, wherein an upper surface of the sleeve and a lower surface of the hub have an oil interface formed therebetween to seal oil. | 05-23-2013 |
20130127274 | SPINDLE MOTOR - There is provided a spindle motor including: a hub operating together with a shaft and including a magnet; a base coupled to a sleeve supporting the shaft and including a core having a coil wound therearound, the coil generating rotational driving force; and a shielding part provided on the magnet and blocking magnetic flux introduced from the magnet into the base to thereby increase magnetic flux density between the magnet and the core, wherein the shaft and the hub rotate while descending via oil when power is applied to the coil. | 05-23-2013 |
20140054995 | FLUID DYNAMIC BEARING ASSEMBLY AND MOTOR HAVING THE SAME - The fluid dynamic bearing assembly of including: a sleeve formed to have a hollow into which a shaft is inserted; a sleeve housing formed to insert the sleeve therein; a bypass passage formed to axially communicate the upper portion and the lower portion of the sleeve between the sleeve and the sleeve housing and dispersing pressure of a lubricating fluid in the hollow; an oil sealing cap having an oil passage communicated with the bypass passage and taper-sealing the lubricating fluid within the oil passage; and a thrust plate formed to have a hole corresponding to a shape of the outer peripheral surface of the shaft and axially disposed under the sleeve. | 02-27-2014 |