An axial compact direct drive for a storage disk comprises a stator, a rotor carrying a hub for receiving storage disks and a bearing arrangement. The bearing arrangement is disposed at a radially external edge of the hub to rotatably support the hub against axial and radial movement. The rotor is electrically driven at locations in the center of the stator or at locations surrounding the stator.
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15. A storage disk drive, especially for a hard storage disk, comprising a stator, a rotor, a bearing arrangement (10, 12; 18, 19) and a coaxial hub (5, 7) having a radially external edge, to the outer surface of which one or more hard disks are secured, characterised in that the bearing arrangement comprises a bearing disposed in the region of the radially external edge of the hub which rotatably supports the hub against axial and radial movement.
1. A storage disk drive, especially for a hard storage disk, comprising a stator, a rotor, a bearing arrangement (10, 12; 18, 19) and a coaxial hub (5, 7) having a radially external edge, to the outer surface of which one or more hard disks are secured, characterised in that the bearing arrangement rotatably supports the hub (5, 7) exclusively in the region of the radially external edge of the hub.
30. A disk storage device comprising:
a clean room defined in part by a base plate; one or more hard data storage disks; a data read head mounted on the base plate for movement in operative relation to the disk within the clean room; a stator; a rotor; a bearing arrangement and a coaxial hub having a radially external edge, to the outer surface of which the one or more hard disks are secured, characterized in that the bearing arrangement comprises a bearing disposed in the region of the radially external edge of the hub which rotatably supports the hub against axial and radial movement.
24. A disk storage device comprising:
a clean room defined in part by a base plate; at least one hard storage disk; a data read for movement in operative relation to the disk within the clean room; a stator; a cylindrical rotor member having an outer diameter of first dimension; a coaxial hub having a radially external edge, to the outer surface of which said hard disk is secured; and a bearing arrangement mounted on said base plate including bearing elements rotatably supporting said coaxial hub in the region of the radially external edge against axial and radial movement, said bearing elements being restrained to follow a circular bearing path having a diameter greater than said first dimension.
17. A disk storage device comprising:
a clean room defined in part by a base plate; at least one hard storage disk; a data read head for movement in operative relation to the disk within the clean room; a stator; a cylindrical rotor member having an outer diameter of first dimension; a coaxial hub having a radially external edge, to the outer surface of which said hard disk is secured; and a bearing arrangement mounted on said base plate including bearing elements rotatably supporting said coaxial hub exclusively in the region of the radially external edge of said coaxial hub, said bearing elements being restrained to follow a circular bearing path having a diameter greater than said first dimension.
20. A disk storage device comprising:
a clean room defined in part by a base plate; at least one data storage disk; a data read for movement in operative relation to the disk within the clean room; a stator mounted on said base plate; a hub supporting said data storage disk, said hub having affixed to an inner surface thereof a magnetic element positioned to surround said stator for magnetically interacting therewith to rotate said hub, said hub having a radially external edge; and a bearing arrangement rotatably supporting said hub on said base plate exclusively in the region of the radially external edge of the hub, said bearing arrangement including a plurality of bearing elements and a cage device affixed to said hub for separating said bearing elements, said cage device further arranged to provide a sealing action between said hub and said base plate.
27. A disk storage device comprising:
a clean room defined in part by a base plate; at least one data storage disk; a data read for movement in operative relation to the disk within the clean room; a stator mounted on said base plate; a hub supporting said data storage disk, said hub having affixed to an inner surface thereof a magnetic element positioned to surround said stator for magnetically interacting therewith to rotate said hub, said hub having a radially external edge; and a bearing arrangement rotatably supporting said hub in the region of the radially external edge against axial and radial movement on said base plate, said bearing arrangement including a plurality of bearing elements and a cage device affixed to said hub for separating said bearing elements, said cage device further arranged to provide a sealing action between said hub and said base plate.
18. A disk storage device comprising:
a clean room defined in part by a base plate; at least one data storage disk; a data read head for movement in operative relation to the disk within the clean room; a rotatable disk mounting element forming a hub for supporting said storage disk in said clean room, said disk mounting element having a radially external edge; a cylindrical bearing support member mounted on said base plate; at least one bearing mounted on the outer surface of said bearing support member and engaging said disk mounting element for supporting the disk mounting element exclusively in the region of the radially external edge for rotation in the clean room; and a motor coupled to said disk mounting element for rotating said disk mounting element and said storage disk, said motor including stator and magnetic rotor elements mounted within said bearing support member.
25. A disk storage device comprising:
a clean room defined in part by a base plate; at least one data storage disk; a data read head for movement in operative relation to the disk within the clean room; a rotatable disk mounting element forming a hub for supporting said storage disk in said clean room, said disk mounting element having a radially external edge; a cylindrical bearing support member mounted on said base plate; at least one bearing mounted on the outer surface of said bearing support member and engaging said disk mounting element to support the disk mounting element in the region of the radially external edge for rotation against axial and radial movement in the clean room; and a motor coupled to said disk mounting element for rotating said disk mounting element and said storage disk, said motor including stator and magnetic rotor elements mounted within said bearing support member.
19. A disk storage device comprising:
a clean room defined in part by a base plate; at least one data storage disk; a data read head for movement in operative relation to the disk within the clean room; a rotatable disk mounting element forming a hub for supporting said storage disk in said clean room, said rotatable disk mounting element having a radially external edge; a cylindrical bearing support member affixed to said rotatable disk mounting element; at least one bearing mounted on the outer surface of said bearing support member and engaging said base plate for supporting said disk mounting element exclusively in the region of the radially external edge for rotation in the clean room; and a motor coupled to said disk mounting element for rotating said disk mounting element and said storage disk, said motor including stator and magnetic rotor elements mounted within said bearing support member.
26. A disk storage device comprising:
a clean room defined in part by a base plate; at least one data storage disk; a data read for movement in operative relation to the disk within the clean room; a rotatable disk mounting element forming a hub for supporting said storage disk in said clean room, said disk mounting element having a radially external edge; a cylindrical bearing support member affixed to said rotatable disk mounting element; at least one bearing mounted on the outer surface of said bearing support member and engaging said base plate for supporting said disk mounting element in the region of the radially external edge for rotation against axial and radial movement in the clean room; and a motor coupled to said disk mounting element for rotating said disk mounting element and said storage disk, said motor including stator and magnetic rotor elements mounted within said bearing support member.
21. A disk storage device comprising:
a clean room defined in part by a base plate; at least one data storage disk; a data read head mounted on the base plate for movement in operative relation to the disk within the clean room; a stator mounted on said base plate; a hub supporting said data storage disk, said hub having affixed to an inner surface thereof a magnetic element positioned to surround said stator for magnetically interacting therewith to rotate said hub, said hub having a radially external edge; a bearing arrangement rotatably supporting said hub on said base plate exclusively in the region of the radially external edge of the hub; and a ventilation arrangement including an inlet opening in said base plate adjacent said stator and an outlet opening in said base plate outside the periphery of said hub, whereby rotation of said hub draws air into said inlet opening and ejects air through said outlet opening so that contaminants from said motor are removed by the flow of air through said outlet opening.
28. A disk storage device comprising:
a clean room defined in part by a base plate; at least one data storage disk; a data read head mounted on the base plate for movement in operative relation to the disk within the clean room; a stator mounted on said base plate; a hub supporting said data storage disk, said hub having affixed to an inner surface thereof a magnetic element positioned to surround said stator for magnetically interacting therewith to rotate said hub, said hub having a radially external edge; a bearing arrangement rotatably supporting said hub in the region of the radially external edge against axial and radial movement on said base plate; and a ventilation arrangement including an inlet opening in said base plate adjacent said stator and an outlet opening in said base plate outside the periphery of said hub, whereby rotation of said hub draws air into said inlet opening and ejects air through said outlet opening so that contaminants from said motor are removed by the flow of air through said outlet opening.
23. A disk storage device comprising:
a clean room; at least one data storage disk; a data head for movement in operative relation to the disk within the clean room; a rotatable disk mounting element forming a hub for supporting said storage disk in said clean room, said disk mounting element having a radially external edge; a permanent magnetic ring affixed to said rotatable disk mounting element, said ring having an outer diameter of a first dimension; a stator positioned within said permanent magnetic ring and separated therefrom by a substantially cylindrical air gap, said stator producing magnetic flux interacting with said permanent magnetic ring to rotate said rotatable disk mounting element and said data storage disk; a base plate defining a portion of the clean room, said base plate including a bearing support element defining a circular bearing path having a diameter greater than said first dimension; and bearing means engaging said bearing support element and said rotatable disk mounting element for rotatably supporting the disk mounting element in the region of the radially external edge against axial and radial movement on said base plate.
16. A disk storage device comprising:
a clean room; at least one data storage disk; a data read head for movement in operative relation to the disk within the clean room; a rotatable disk mounting element forming a hub for supporting said storage disk in said clean room, said disk mounting element having a radially external edge; a permanent magnetic ring affixed to said rotatable disk mounting element, said ring having an outer diameter of a first dimension; a stator positioned within said permanent magnetic ring and separated therefrom by a substantially cylindrical air gap, said stator producing magnetic flux interacting with said permanent magnetic ring to rotate said rotatable disk mounting element and said data storage disk; a base plate defining a portion of the clean room, said base plate including a bearing support element defining a circular bearing path having a diameter greater than said first dimension; and bearing means engaging said bearing support element and said rotatable disk mounting element for rotatably supporting the disk mounting element on said base plate exclusively in the region of the radially external edge of said disk mounting element.
2. A storage disk drive according to
3. A storage disk drive according to
4. A storage disk drive according to
5. A storage disk drive according to
6. A storage disk drive according to
7. A storage disk drive according to
8. A storage disk drive according to
9. A storage disk drive according to
10. A storage disk drive according to
11. A storage disk drive according to
12. A storage disk drive according to
13. A storage disk drive according to any one of the preceding claims, characterised in that a ventilation device is provided, consisting of an inlet opening (71) and an outlet opening (72), the openings (71) and (72) being provided with filter inserts.
14. A storage disk drive according to any one of the preceding claims, characterised in that an exchangeable stator part (1) is provided for subsequent mounting in the storage disk drive.
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The application relates to a storage disk direct drive including a motor and a bearing arrangement for rotatably supporting a hub that carries storage disks. In arrangements of this kind, as a result of the extreme accuracy required as a result of the increasingly small size of the storage disks of 2.5 to 1.8 or even 1.3 inches in diameter (1 inch=25.4 mm), it is difficult to observe the extreme tolerances and to meet the specific quality requirements which must be achieved in these motors. These requirements of errors relate to non-repeatable run out or NRR. In addition, the influence of temperature deviations must be compensated for. Furthermore, a specific load-carrying capacity must be guaranteed for the bearing arrangement and certain resonance frequencies must be avoided.
Therefore, the object of the invention is to design a massproducible subminiature motor by means of which the abovementioned properties are additionally obtained.
The invention will now be described in more detail, by way of example, with reference to the drawings, in which
FIG. 1 is a diagrammatical longitudinal sectional view of an external rotor variant.
FIG. 2 is a diagrammatical longitudinal sectional view of an internal rotor alternative variant.
FIG. 3 is a diagrammatical longitudinal sectional view of an external rotor variant.
FIG. 4 is a diagrammatical longitudinal sectional view of an internal rotor alternative variant.
FIG. 5 is a diagrammatical longitudinal sectional view of an external rotor variant.
FIG. 6 is a diagrammatical longitudinal sectional view of an internal rotor alternative variant.
FIG. 7 is a further embodiment showing a diagrammatical longitudinal sectional view showing the use of an integrated ball bearing.
internal stator 1 external stator 2 is supported on the upwardly projecting ring 16, in the embodiment according to FIG. 4, the internal stator 1 is directly connected, e.g. sealed or glued, to the base plate 8. An outer ring 13, which, in the case of the embodiment according to FIG. 4, projects upwardly from the plate 8 and is connected in one piece therewith, is designed to rotate in the embodiment according to FIG. 2, the hollow cylinder 11, as also shown in FIGS. 1 and 2, being formed by the rotating hub. This means that in the case of the embodiment according to FIGS. 1 and 2, the outer raceways of the bearings 10 are inserted into the cup-shaped hub and rotate therewith, whereas, in the case of the embodiments of FIGS. 3 and 4, the inner raceways of these external bearings 12 rotate with the pulled-down ring wall 17. In the case of the external rotor motors according to FIGS. 1, 3 and 5, the air gap is designated by the reference numeral 22, and in FIGS. 2, 4 and 6 for the internal rotor variants, the air gap is designated by the reference numeral 23. In FIGS. 1, 3 and 5, the pulled-down ring parts 17 carry the hollow cylindrical permanent magnetic ring 3 of large diameter which allows for a relatively large air gap surface, so that the magnetic flux passing through the air gap does not need to have an extremely high density as in the case of the embodiments of FIGS. 2, 4 and 6, this allowing the latter to be produced from a less expensive material. In an analogous manner, in the embodiments according to FIGS. 2, 4 and 6, permanent magnetic rings 4, 6 or ring segments are supported on the preferably ferromagnetic rotor shaft 6. The shaft 6, together with the ring or the ring parts 4, thus forms the internal rotor.
The magnetic storage disks are not only situated on the highly precise cylindrical outer surface 7, but also lie on the radially projecting shoulders 14 (FIGS. 1-4), 15 (FIGS. 5 and 6). These shoulders 14, 15 partly cover the bearings 10 and 12, particularly in the case of the embodiments according to FIGS. 3 and 4, so that it is also possible with respect to the design to provide labyrinth sealing elements at the gaps 28, 29. As shown in FIGS. 1-7, hub 5, a magnetic hard data storage disk 102, and a read head 104 are positioned in a clean chamber or clean room CR, sealed from elements, as readily apparent to those of ordinary skill in the art. FIGS. 5 and 6 show an arrangement of long axial design intended to drive a plurality of disks. In these embodiments, the cylindrical surface 7 is of longer design. Two bearings 18, 19 inserted axially on top of one another into the external rotor bell 5, 24 are provided, separated by a spacer ring 31 on the stator side. In both embodiments according to FIGS. 5 and 6, the outer raceways of the bearings 18, 19 carry the hollow cylindrical wall 24 of the storage disk hub which is pulled down flush with the shoulder 15 reaching as far as the plate 8. In the embodiments of FIGS. 1, 3 and 5, the central disk 5 which forms the centre center of the hub is, so to speak, shaftless, whereas, in the embodiments of FIGS. 2, 4 and 6, this disc passes over into the central shaft 6 which rotates.
In the case of the embodiments according to FIGS. 1, 3 and 5, the internal stator can also be supported via what is referred to as a vertical shaft, although the bearing means then do not engage this vertical shaft.
In all of the embodiments of the invention (see all of FIGS. 1 to 6) it is essential that the elements for the bearing arrangement 10, 12, 18 and 19 are situated radially outside the actual motor, i.e. that they surround the latter. The driving motor is then almost inserted into the bearing arrangement.
In view of the criteria mentioned at the outset, this new concept according to the invention has proven to be advantageous in these special motors for a high load-carrying capacity and for good preloading, and also for noise generation and also quiet physical running. These bearing arrangements of relatively large radial design according to the invention also have a larger ball number, this also being advantageous for the required properties.
A further embodiment according to FIG. 7 (page 4/4 of the drawings) shows another arrangement of the invention also of long axial design. In comparison to the previous arrangements, this is characterised characterized in that an integrated ball bearing is provided instead of a conventional ball bearing 12. This consists of balls 121, an inner raceway 122, an outer raceway 123 and a ball cage device 73. The races preferably have adjacent surfaces in the shape of a truncated cone and are precision turned or ground. The ball cage device 73 is placed on the rotor part 17. It has finger-like projections, preferably of a plastic material, which separate the balls of the bearing at a suitable spacing. As a result of its dimensions, the ball cage device serves simultaneously as a sealing element in order to keep abraded particles from the region of the bearing arrangement away from the region of the data storage or the magnetic disks, i.e., clean chamber CR. This function is supported by an optionally provided sealing plate 74. A ventilation device is provided as a further additional measure against contamination of the data storage region, i.e., clean chamber CR. This consists of an inlet opening 71 with an integrated filter (not shown) 802 of cellulose or foam material, and an outlet opening 72 which is also situated in the stator part 13 and is also provided with an integrated filter (not shown) 902. Integrated filter 802 and integrated filter 902 are shown in FIG. 8 and FIG. 9, respectively. A negative pressure is produced at the inlet opening 71 by the rotational movement of the rotor part/hub 5, so that air is drawn in at this point. On the other hand, excess pressure is produced at the opening 72, so that the air drawn in at this point escapes and any abraded particles produced are preferably discharged at this point. It will be understood that the arrangement is assembled in the conventional manner, i.e. the rotor part/hub 5 is displaced out of its coaxial position, after which the ball bearing balls are inserted on one side. The rotor part/hub 5 is then returned to its coaxial set position, the balls are distributed by rotation and finally the ball cage device is mounted. According to the invention, the stator 1 is advantageously inserted into and fixed to the arrangement subsequently in order to maintain small air gaps between the stator and the magnet 3.
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