Abstract: The invention related to a spindle motor for hard disk drives with improved running accuracy where the sheet metal package or the complete stator consisting of sheet metal package and windings is encompassed by a centering casing of plastic, which is preferably applied by means of an injection molding operation. Depending on the design of the spindle motor the centering casing can be centered on the stationary shaft and/or on the outer rings/inner raceways pertaining to the sets of roolling bodies. Furthermore, a stator without centering casing is described whose sheet metal package is centered directly on the outer rings/inner raceways.

Abstract: The invention relates to a spindle motor, in particular for driving a hard disk drive, with a stator, a rotor and a shaft disposed between stator and rotor, which supports at least one roller bearing, which comprises an inner and an outer bearing ring with roller bodies disposed between them. According to the invention the spindle motor comprises a device for the temperature compensation. In a first embodiment the invention is distinguished thereby that at least one equilibration element is provided which acts onto the outer and/or inner bearing ring, [which element is] disposed between the corresponding bearing ring and a part supporting the bearing ring, and has a specified coefficient of thermal expansion &agr;. In a second embodiment the shaft is used as equilibration element, wherein the shaft comprises a material with a low coefficient of thermal expansion &agr;.

Abstract: The invention relates to a spindle motor for solid-plate running gears with a stator, a rotor, the shaft of which is turnably borne with the aid of rolling bearings with respect to the stator, and a shell, in which the shell is constructed as a separate pot-shaped part closed on one side, on the outer circumference of which the stator is held and on the inner circumference of which the outer rings of the rolling bearings are held.

Abstract: The invention relates to a spindle motor having a sealing support film which prevents exchange of air between the interior and surroundings of the spindle motor. In spindle motors for hard disk drives it is extremely important to construct the spindle motor so that it is sealed tight against the external environment, ie so that from the connecting side of the spindle motor no admission of air to the interior of the spindle motor can occur. A further characteristic of the invention consists in that the support film is bonded and fixed in place in sealing manner by means of an adhesive which does not give off gas or does so only very slightly.

Abstract: A spindle-drive motor for hard drives having a baseplate, a shaft and one or more bearings for rotational mounting of a rotationally driven rotor, with at least one magnetic fluid seal arranged between the stationary part and the rotating part of the spindle-drive motor. The seal is formed of an upper and a lower yoke lamination and a magnet disk arranged between the yoke laminations, where a concentric chamber is formed so that it is open toward the inside on one side to hold a magnetically conducting fluid. A flux concentrating lamination extends into this chamber. In one embodiment of this invention, the flux concentrating lamination is in direct or indirect contact with one end face of the inner bearing ring of the bearing, while the outer part of the magnetic fluid seal is in direct or indirect contact with the end face of the outer bearing ring of the bearing.

Abstract: A motor mount for small high-speed motors, consisting of radial and axial bearing components. The axial bearing is configured as a magnetic bearing and the radial bearing as an air bearing.

Abstract: The present invention concerns a sealing contacting system for the stator windings of spindle motors, which are provided for installation in the base plate of hard disk drives. The present invention has a peripheral, self-contained sealing surface free from interruptions, which avoids jumps or unevenness in the peripheral sealing region, eliminating previously unavoidable radial capillary gaps, so that hermetic sealing is produced between the region of the hard disks formed from clean space and the external ambient region.

Abstract: The invention relates to a disk drive with spindle motor and electrical connection arrangement, comprising a baseplate, a central shaft, an armature which is mounted rotatably with respect to the baseplate by means of a suitable bearings and on which at least one storage disk is arranged, and a stator-side winding stack provided with coils and attached to the baseplate by means of a winding support, the electrical connection of the coils of the winding stack being effected by means of terminal tags. The terminal tags simultaneously serve as soldering terminals for the ends of the wires coming from the coils and as contact springs for non-positive spring-loaded connection to corresponding contact lands on the printed circuit board.

Abstract: This invention relates to a driving device, especially for hard disk drives, consisting of a stator, a rotor, an axis as well as corresponding bearings. The winding packet constituting the drive is arranged, together with the corresponding laminated core, on a holding sleeve, which projects axially on both sides over the laminated core. Possible production methods relating to this invention are also described.

Abstract: The present invention relates to a spindle motor with a magnetic seal. A method and an apparatus are described for sealing spindle motors, preferably those used for disk storage units.

Abstract: The present invention concerns an electronically commutated motor, in which for commutation, the output signals of a number of correspondingly arranged Hall sensors are initially evaluated to generate a multiple-figure digital code and in which, after startup of the motor, only one figure of the code is still generated by evaluation of the output signal of a single Hall sensor, while the remaining figures of the digital code are taken from a table stored in an electronic logic component as bit pattern or determined by means of a corresponding algorithm. The advantage of this expedient is that commutation no longer depends on the position-tolerance arrangement of several Hall sensors, but occurs at the best possible time.

Abstract: A drive apparatus for hard disc memories with an integrated labyrinth seal and a motor to drive the rotor cap that has at least one hard memory disc fastened to it. Between a stationary shaft and the rotor cap at least two bearings are arranged which are separated from the space determined for storing the hard memory discs by labyrinth seals. In the design of the labyrinth seals, the rotor cap has in its lower/upper areas radially inwardly-directed annular flanges whose inside radial face forms an upper/lower seal gap of the labyrinth seal in connection with the stationary shaft. A separate upper/lower labyrinth seal is connected solidly to the rotor cap at a distance from the lower/upper seal gap, whose inner radial face forms an upper/lower seal gap in connection with the stationary shaft.

Abstract: The invention relates to a spindle motor with a contact arrangement which comprises a stationary base flange carrying a central spindle, a hub which is pivotably borne on the spindle by means of suitable bearings and on which at least one hand disk is arranged, and a stator-sided winding assembly fastened to the base flange by means of a winding support, with the winding assembly being arranged opposite a rotor magnet, with electric contacting of the winding assembly being accomplished by means of a terminal fitting equipped with terminal lugs to which the leads coming from the winding assembly are connected. The invention is characterized by contact pins being arranged in/on the winding support which allow direct contacting between the leads of the winding assembly and the terminal lugs of the terminal fitting.

Abstract: A spindle-drive motor, especially for driving a hard drive, with a stator, a rotor, an axle between them having at least one bearing, and a drive, where the rotor or stator is provided with a bushing which accommodates at least one bearing. The bushing and bearing together form a sealing gap which seals the rotor and the stator with respect to each other.