USRE38673E1 - Disk storage device having a hub sealing member feature - Google Patents

Disk storage device having a hub sealing member feature Download PDF

Info

Publication number
USRE38673E1
USRE38673E1 US09333397 US33339799A USRE38673E1 US RE38673 E1 USRE38673 E1 US RE38673E1 US 09333397 US09333397 US 09333397 US 33339799 A US33339799 A US 33339799A US RE38673 E1 USRE38673 E1 US RE38673E1
Authority
US
Grant status
Grant
Patent type
Prior art keywords
disk
rotor
stator
hub
member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US09333397
Inventor
Dieter Elsässer
Johann von der Heide
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Papst Licensing GmbH and Co KG
Original Assignee
Papst Licensing GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/08Arrangements for controlling the speed or torque of a single motor
    • H02P6/085Arrangements for controlling the speed or torque of a single motor in a bridge configuration
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02Details
    • G11B17/038Centering or locking of a plurality of discs in a single cartridge
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20Driving; Starting; Stopping; Control thereof
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20Driving; Starting; Stopping; Control thereof
    • G11B19/2009Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/50Reconditioning of record carriers; Cleaning of record carriers; Carrying-off electrostatic charges
    • G11B23/505Reconditioning of record carriers; Cleaning of record carriers; Carrying-off electrostatic charges of disk carriers
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G11B25/043Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K11/00Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/01Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K11/00Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30Structural association with control circuits or drive circuits
    • H02K11/33Drive circuits, e.g. power electronics
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K11/00Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40Structural association with grounding devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K29/00Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. of water or fingers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124Sealing of shafts
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1735Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at only one end of the rotor
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1737Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225Terminal boxes or connection arrangements
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08Structural association with bearings
    • H02K7/085Structural association with bearings radially supporting the rotary shaft at only one end of the rotor
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08Structural association with bearings
    • H02K7/086Structural association with bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2211/00Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
    • H02K2211/03Machines characterised by circuit boards, e.g. pcb
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28Layout of windings or of connections between windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08Structural association with bearings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2209/00Indexing scheme relating to controlling arrangements characterised by the waveform of the supplied voltage or current
    • H02P2209/07Trapezoidal waveform

Abstract

A disk memory drive includes a brushless drive outer rotor motor having an internal space and a stator with windings. The outer rotor coaxially encircles the stator and a substantially cylindrical air gap is defined between the stator and the rotor. The rotor includes permanent magnets and a hub fixedly connected with the magnet. A disk mounting section is provided on the hub for accommodating at least one storage disk positioned in a clear space, the mounting section being adapted to extend through a central aperture of the storage disk. The windings and the magnets interacting with the windings are disposed for at least half of the axial longitudinal dimension thereof within a space surrounded by the disk mounting section of the hub. Bearings rotatably mount the rotor and the hub.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

A broadening reissue application for U.S. Pat. No. 5,173,814 was filed on Dec. 20, 1994 and assigned Ser. No. 08/360,226. On Mar. 4, 1997, a continuation of this application was filed and was assigned Ser. No. 08/819,099. On Jun. 9, 1999, five continuation applications from the Ser. No. 08/819,099 application were filed. On Nov. 17, 1999, a sixth continuation application from the Ser. No. 819,099 application was filed. These applications, as currently pending, are described below:

a. “Disk Storage Device Having A Sealed Bearing Tube,” (Ser. No. 09/333,399 ), inventors Elsässer and von der Heide, filed Jun. 9, 1999;

b. “Disk Storage Device Having A Radial Magnetic Yoke Feature,” (Ser. No. 09/333,398 ), inventors Elsässer, von der Heide, and Müller, filed Jun. 9, 1999;

c. “Disk Storage Device Having A Hub Sealing Member Feature,” (Ser. No. 09/333,397 ), inventors Elsässer and von der Heide, filed Jun. 9, 1999;

d. “Disk Storage Device Having An Underhub Spindle Motor,” (Ser. No. 09/333,396 ), inventors Elsässer, von der Heide, and Müller, filed Jun. 9, 1999;

e. “Disk Storage Device Having A Particular Magnetic Yoke Feature,” (Ser. No. 09/333,400 ), now U.S. Pat. No. Re. 38,179, inventors Elsässer and von der Heide, filed Jun. 9, 1999; and

f. “Disk Storage Device Having An Undercut Hub Member,” (Ser. No. 09/441,504 ), inventors Elsässer and von der Heide, filed Nov. 17, 1999.

BACKGROUND OF THE INVENTION

This is a continuation of application Ser. No. 08/819,099, filed Mar. 4, 1997, now U.S. Pat. No. Re. 37,058, issued Feb. 20, 2001, which is a continuation of application Ser. No. 08/360,226, filed Dec. 20, 1994, now abandoned, which is a broadening reissue application of U.S. Pat. No. 5,173,814, issued Dec. 22, 1992 from application Ser. No. 07/653,100, filed Feb. 8, 1991, which is a continuation of application Ser. No. 07/402,917, filed Sep. 5, 1989, now U.S. Pat. No. 5,001,581, issued Mar. 19, 1991, which is a continuation of application Ser. No. 201,736, filed Jun. 2, 1988, now U.S. Pat. No. 4,894,738, issued Jan. 16, 1990, now U.S. Pat. No. Re. 35,792, issued May 12, 1998, which is a continuation-in-part of application Ser. No. 038,049, filed Apr. 14, 1987, now U.S. Pat. No. 4,843,500, issued Jun. 27, 1989, which is a continuation-in-part of application Ser. No. 767,671, filed Aug. 21, 1985, now U.S. Pat. No. 4,658,312, issued Apr. 14, 1987, which is a continuation of application Ser. No. 412,093, filed Aug. 27, 1982, now abandoned, which is a continuation-in-part of application Ser. No. 06/326,559, filed Dec. 2, 1981, now U.S. Pat. No. 4,519,010, issued May 21, 1985, said application Ser. No. 06/412,093 also being a continuation-in- part of application Ser. No. 06/244,971, filed Mar. 18, 1981, now abandoned, said application Ser. No. 07/201,736 also being a continuation-in-part of application Ser. No. 07/32,954, filed Mar. 31, 1987, U.S. Pat. No. 4,779,165, issued Oct. 18, 1988, now U.S. Pat. No. Re. 34,412, issued Oct. 19, 1993 which is a continuation of application Ser. No. 06/733,231, filed May 10, 1985, now abandoned, which is a continuation-in-part of the said application Ser. No. 06/412,093, said application Ser. No. 767,671 also being a continuation-in-part of Ser. No. 06/617,629, filed Jun. 6, 1984, now U.S. Pat. No. 4,556,829.

The invention relates to a disk storage drive for receiving at least one storage disk having a central opening, with an outer rotor type driving motor having a rotor casing mounted by means of a shaft in a bearing system so as to rotate relative to a stator and on which can be placed the storage disk for driving by the rotor casing, as described in U.S. patent application Ser. No. 353,584, now U.S. Pat. No. 4,438,542, issued Mar. 27, 1984.

The content of this patent is incorporated herein by reference to avoid unnecessary repetition. It relates to a storage drive for receiving at least one storage disk having a central opening. The driving motor extends coaxially at least partly through the central opening of the storage disk, and means are provided for connecting the storage disk and the driving motor rotor.

BRIEF SUMMARY OF THE INVENTION

One problem of the present invention is to further simplify the construction of a disk storage described in the aforementioned U.S. Pat. No. 4,438,542, while improving its operation. For example, the storage disk is to be reliably protected against undesired influencing by the magnetically active parts of the driving motor. In addition, a particularly space-saving and robust construction of the driving motor are to be achieved.

According to the invention, this first problem is solved in that at least the part of the rotor casing receiving the storage disk is made from a non-ferromagnetic material and carries the shaft directly or by means of a hub and in that a magnetic shield made from a ferromagnetic material in the form of a drawn can projects into the storage disk receiving part of the rotor casing and is connected thereto. The shielding surrounds the periphery of the magnetically active parts of the driving motor and also envelops the parts at one end. The shield has a central opening whose edge is directly radially adjacent the shaft or parts of the driving motor carrying or supporting the shaft. A rotor casing constructed in this way can be easily manufactured, and it effectively protects the magnetically sensitive storage disks, particularly magnetic hard storage disks, against magnetic stray flux emanating from the magnetically active parts of the driving motor. The shield is preferably in the form of a deep-drawn can, and the part of the rotor casing receiving the storage disk can be made from a lightweight metal by die casting.

If, in the manner described in the aforementioned U.S. Pat. No. 4,438,542, the driving motor is constructed as a brushless direct current motor with a permanent magnet rotor, then in accordance with a further development of the invention a printed circuit board with at least one rotary position detector and perhaps other electronic components for the control and regulation of the driving motor are mounted on the side of the stator remote from the closed end of the shielding can. This ensures that the rotary position detector and any further circuit components of the magnetic shielding arrangement do not interfere with the rotating parts.

Further advantageous developments of the invention also are disclosed, including features that contribute to a compact construction of the disk storage drive. In connection with disk storage drives of the present type, high demands are made on the concentricity of the storage disks. It is therefore generally necessary to machine the storage disk receiving part or to work it in some other way so that it is dimensionally true. As a result of other features of the invention, the necessary machining is reduced to a relatively small part of the circumferential surface of the storage disk receiving part and a trouble-free engagement of a storage disk on the shoulder of the storage disk receiving part is permitted.

Other features of the invention provide a robust precision mounting support for utilizing the available axial overall length for maximizing the distance between the bearings; and permit particularly large distances between the bearings where the axial installation area between a mounting or assembly flange and the end of the storage disk receiving part is limited. Installation space is available on the other side of this flange. Still other features provide for alternative solutions leading to particularly small radial runouts of the rotor; ensure a space-saving housing of the circuit board; and for solutions where importance is attached to a particularly shallow construction.

In a further development of the invention, a disk storage drive of the type disclosed in U.S. Pat. No. 4,779,165, issued Oct. 18, 1988, now U.S. Pat. No. Re. 34,412, issued Oct. 19, 1993, is considered. Some such disk storage drives have stationary shafts and a sealed off internal space within the motor.

In the construction of such data storage disk drives with stationary shafts, problems also have arisen in the following areas:

a) Achieving extremely high level of precision required for repeatable shaft runout;

b) Improving the sealing of the clean chamber; and

c) Achieving a and b within acceptable costs.

Yet another purpose of the present invention, therefore, is to provide a further development of the data storage disk drive of the above type having a stationary shaft by providing viable solutions for various combinations of the above problems, such as a and c; b and c; and a, b and c.

If the rotational position sensor device has several rotational position sensors, preferably of the type sensitive to magnetic fields, it is advantageous for these sensors to be supported on a common molded piece, especially if it is made by injection molding. The construction of the molded piece for the accommodation of several rotational position sensors in accordance with the invention simply ensures the precise mutual alignment of these sensors.

If required, the rotary position sensing arrangement can be mounted on a printed circuit board, together with any known type of commutation electronics. This printed circuit board can be supported on a fixed flange or bracket which is, in turn, connected to the shaft through which the connecting leads to the rotary position sensors may be brought out.

The control arrangement, which preferably takes the form of a control magnet device, can be mounted on the outside of a cover which seals off the space inside the motor. This cover may preferably serve as a bearing bracket as well. The control arrangement, however, also can be mounted on a part of the hub at a distance from the disk carrier stage outside the sealed internal space of the motor. A flange which serves to support the data storage disk or disks, may be connected to the remaining hub parts as one piece, or alternatively, this flange may form part of the cover which seals off the internal space of the motor.

In accordance with one variant of the present invention, at least the electric supply leads to the stator windings are brought out of the sealed internal space of the motor over a bearing support ring. This arrangement obviates the need to provide passages in the shaft to accommodate the winding connections. In yet another alternative arrangement, the rotary position sensing arrangement, together with the commutation electronics, if necessary, can both be housed in the sealed internal space of the motor with their leads and connections being brought out over the bearing support ring. In any event, none of the above arrangements requires the provision of passages formed through the stationary shaft, thus avoiding the need to weaken the shaft or to perform additional machining operations in the manufacturing thereof.

The bearing support ring can be a prefabricated component provided with recesses for the passage of the electric leads and connections. Alternatively, the aforesaid connections can be potted in situ inside the bearing support ring.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is described in greater detail hereinafter relative to non-limitative embodiments and the attached drawings, wherein:

FIG. 1 is a vertical partial sectional view through an embodiment of the invention along the line I—I of FIG. 2;

FIG. 2 is a plan view of the arrangement of FIG. 1;

FIG. 3 is a sectional view through another embodiment of the invention with an extended bearing tube;

FIG. 4 is a sectional view through a further embodiment of the invention;

FIG. 5 is a section through a disk storage drive motor, less the hub, according to the invention along line V—V of FIG. 6;

FIG. 6 is a section along line VI—VI of FIG. 5 and illustrating a rotational position sensor device located outside the sealed internal space of the motor;

FIG. 7 is a section similar to FIG. 6 of a modified embodiment of the invention;

FIG. 8 is a section similar to FIG. 6 of another modified embodiment of the invention;

FIG. 9 is a section similar to FIG. 6 of yet another modified embodiment of the invention;

FIG. 10 is a section similar to FIG. 6 of yet another embodiment of the invention;

FIG. 11 is a section through a disk storage drive according to the invention illustrating a rotational position sensor device located inside the sealed internal space of the motor with leads brought out through bearing support ring;

FIG. 12 is a partial section similar to but yet a variant of FIG. 7 of yet another embodiment of the invention having the rotational position sensor device located outside the sealed internal space of the motor;

FIG. 13 is a section illustrating a further variant of the embodiment shown in FIG. 6; and

FIG. 14 is a section illustrating yet another variant of the embodiment shown in FIG. 6.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The disk storage drive illustrated in FIG. 1, having an extremely shallow construction, has a brushless direct current motor 45 having a rotor casing 47 fixed to and coaxial with a rotor shaft 46. A stator lamination 48, carrying a stator winding 49, is mounted on a bearing tube 50. The rotor shaft 46 is rotatably mounted within the bearing tube 50 by means of two bearings 52 and 53. These are kept axially spaced by a pair of retaining rings 54. A cup spring 55 is supported on the underside of the bearing 53 by a retaining ring 56 resting on the rotary shaft 46, so that the bearings 52, 53 are axially braced relative to one another. The bearings 52, 53 are pressed into the bearing tube 50 at the time of assembly. Together with an assembly flange 24, the bearing tube 50 forms a one-piece die casting.

The rotor casing 47 comprises a storage disk receiving part 25 and a shielding can 26, which are joined together, for example, by riveting. The storage disk receiving part 25 is made from a non-ferromagnetic material, preferably lightweight metal. The rotor shaft 46 is pressed into a central opening of the storage disk receiving part 25. As an alternative, the shaft can be cast into the receiving part.

The shielding can 26 is made from a ferromagnetic material and can in particular be constructed as a soft iron deep-drawn part. A plurality of permanent magnetic segments or a one-part permanent magnet 69 are fixed to the inner face of shielding can 26 radially facing the stator lamination 48. The permanent magnet 69 preferably comprises a mixture of hard ferrite, for example, barium ferrite, and an elastic material. Thus, it is a so-called rubber magnet. The latter is trapezoidally or approximately trapezoidally radially magnetized via the pole pitch in a motor construction having a relatively small pole clearance. At the same time, the shielding can 26 forms the magnetic return path for magnet 69. The shielding can 26 surrounds the magnetically active parts 48, 49, 69 of the driving motor 45 on the periphery thereof, as well as on one end thereof. The bottom 28 of shielding can 26 is adapted to the shape of the coil winding heads 27 of the stator winding 49 and contains a central opening 29, whose edge is in the immediate radial vicinity of the circumferential surface of the bearing tube 50. In this way, the shielding can effectively prevents the magnetic flux from straying towards the outside of the storage disk receiving part 25.

The storage disk receiving part 25 has two stepped stages 74 and 75, each of whose circumferential surfaces in the present embodiment carry a plurality of radially distributed and projecting bearing webs 79 or 80. The outsides of bearing webs 79, 80 are ground in a dimensionally true manner to accommodate the internal diameter of the hard storage disks to be placed on the receiving part 25. The stepped stages 74, 75 form shoulders 81, 82 and are provided respectively with an annular recess 83 and 84 at the foot axially of bearing webs 79, 80. This structure ensures that storage disks mounted on the bearing webs 79, 80, and having either one of two opening diameters, will cleanly engage against either the shoulder 81 or 82.

The assembly flange 24 is provided with a recess 85 in which is housed a printed circuit board 86. This printed circuit board carries a rotary position detector, for example a Hall IC, as well as other circuit components for the control and regulation of the driving motor 45. The Hall IC 63 extends up axially from the circuit board 86 to the immediate vicinity of the stator lamination 48. The permanent magnet 69 projects axially over the stator lamination 48 in the direction of circuit board 86 until it partly overlaps the Hall IC 63. In this way, the Hall IC 63 or, if desired, some other magnetic field-dependent semi-conductor component, determines the rotary position of the rotor of the driving motor 45.

In the illustrated embodiment, the two bearings 52, 53 are spaced approximately the same axial distance from the axial center of the permanent magnet 69 and the stator lamination 48.

Disk storages are most usually operated in “clean chamber” environments to protect them against contaminants. By means of the assembly flange 24, the storage drive is arranged on a partition (not shown) which separates the ultra-clean area for receiving the storage disks from the remainder of the interior of the equipment. Dirt particles, grease vapors and the like from bearing 52 and parts of the driving motor 45 are prevented from passing into the storage disk receiving area by labyrinth seals 90 and 91. The labyrinth seal 90 is formed in the end of the bearing tube 50 away from the assembly flange 24 that projects into an annular slot 87 on the inside of the storage disk receiving part 25, accompanied by the formation of sealing gaps. Similarly, for forming the labyrinth seal 91, the end of the shield can 26 projects into the annular slot 88 of the assembly flange 24. The labyrinth seals 90, 91 are preferably dimensioned in the manner described in the aforementioned U.S. Pat. No. 4,438,542.

The embodiment of FIG. 3 differs from the arrangement according to FIGS. 1 and 2 in that storage disks having the same opening diameters are placed on bearing webs 79 of a storage disk receiving part 89, which surrounds the majority of the axial dimension of the magnetic shielding can 26. In other words, the magnetically active parts 48, 49, 69 of the driving motor 45 are partially located within the central opening of the storage disk. A bush-like hub 98 is pressed or cast into the storage disk receiving part 89. The rotor shaft 46 is then pressed into the hub 98. The edge of the central opening 29 in the bottom 28 of the shielding can 26 extends up to the portion 99 of the receiving part 89 which received the hub 98.

The bearing tube 50 projects in the axial direction on the side of the assembly flange 100 remote from the stator lamination 48. As a result, a particularly large axial spacing between the two bearings 52, 53 can be achieved. Axially, bearing 52 is in the vicinity of the axial center of the permanent magnet 69 and of the stator lamination 48. The axial spacing between bearings 52 and 53 is equal to or larger than double the bearing external diameter. To prevent electrical charging of the rotor which in operation rotates at high speed and which would disturb the operational reliability of the disk storage device, the rotor shaft 46 is electrically conductively connected to the equipment chassis by means of a bearing ball 78 and a spring contact (not shown). The printed circuit board 101, carrying the rotary position detector 63 and the other electronic components, is supported on the end of a spacer ring 102 facing an assembly flange 100 and is located between the flange and the stator lamination 48. An annular slot 103 is formed in assembly flange 100 and is aligned with the annular circuit board 101. The annular slot 103 provides space for receiving the wire ends and soldered connections projecting from the underside of the circuit board 101.

FIG. 4 shows an embodiment in which a storage disk receiving part 105 is axially extended in order to be able to house a larger number of storage disks than in the arrangement of FIG. 3. The bearing tube 50 is correspondingly axially extended in order to be able to use the existing installation space with a view to a maximum axial spacing between the bearings 52 and 53. The end of the bearing tube 50, remote from an assembly flange 106, embraces the hub 98 connecting the receiving part 105 and the shaft 46, accompanied by the formation of a labyrinth seal 107. The edge of the central opening 29 of shielding can 26 extends up close to the outside of the bearing tube 50. The free end of the shielding can 26 engages a recess 108 in the assembly flange 106. As a result, a further labyrinth seal 109 is formed. This embodiment otherwise corresponds to the structures already described herein.

In FIGS. 5 and 6, a brushless drive motor, designated as 110 has a stator 111 with a stator lamination stack 112. The stator lamination stack 112 is arranged radially and symmetrically with respect to a central axis of rotation 113 and forms six stator poles 114A to 114F in an essentially T-shaped configuration as seen from above in accordance with FIG. 5, which poles are positioned at regular angular intervals of 60°. Instead of one lamination stack, for example, a sintered iron core can also be provided. Pole shoes 115A to 115F, together with a permanent magnetic rotor magnet 116 define an essentially cylindrical air gap 117. The rotor magnet 116 is radially magnetized in four poles around its periphery as indicated in FIG. 5; that is to say, it has four sections 118A to 118D, and, on the internal side of the annular rotor magnet 116 toward the air gap 117 there are positioned, in alternating sequence, two magnetic north poles 119 and two magnetic south poles 120. The poles 119, 120 have, in the example depicted, a width of substantially 180°-el (corresponding to 90° mechanical). Thus, in the circumferential direction of the air gap 117, an approximately rectangular or trapezoidal magnetization is obtained. The rotor magnet 116 is mounted, typically by bonding, in an outer rotor casing or bell 121 of soft magnetic material, preferably steel, which serves both as a magnetic return path and as a magnetic shield. The casing 121 and the magnet 116 together form an external rotor 122. The rotor magnet 116 can include in particular a rubberized magnetic unit, or a plastic-bound magnet. Instead of a single-piece magnetic ring, curved magnetic segments can also be bonded or otherwise attached in the casing 121. Magnetic materials made from synthetic bonding compounds, a mixture of hard ferrite and elastomers, ceramic magnetic materials or samarium cobalt are all particularly suitable as materials for the magnetic ring or segments.

The stator poles 114A to 114F abut a total of six stator slots 123A to 123F. A three-phase stator winding is inserted into these slots. Each of the three phases comprises two 1200°-el fractional pitch windings or coils 124, 125; 126, 127; and 128, 129, each of which is wound around one of the stator poles 114A to 114F. Both of the coils of each phase, which are connected in series, lie, as depicted in FIG. 5, in a diametrically opposed manner and are preferably bifilar wound. As can be seen from the schematic depiction in FIG. 5, any overlapping between the coils 124 to 129 is avoided. This arrangement allows the end turns of the windings 130 (FIG. 6) to be kept as short as possible. In this embodiment of the present invention, optimal filling of the stator slots 123A-123F by the windings is achieved. Fasteners are generally not required to close the slot openings.

A hub 132, not depicted in FIG. 5, is provided with a cylindrical disk mounting section 131 and preferably is made of a light metal, especially aluminum or an aluminum alloy. It is mounted on the outer rotor casing 121. One or more storage disks 134, preferably magnetic or optical fixed storage disks, are provided on the disk mounting section 131, whereby the disk mounting section 131 extends through the conventional central aperture 135 of the storage disks. The lowest storage disk in FIG. 6 is located on a flange 133 of the hub 132 projecting radially outwardly. The data storage disks 134 can be maintained at an axial distance from each other by suitable spacers 136 and are secured to the hub 133 by means of a tightening device, not depicted, of a known type. In the embodiment shown in FIG. 6, the stator 111, the stator stack 112 and the stator winding (coils 124 through 129) as well as the rotor magnet 116 and the outer rotor casing 121 forming the iron shield, are all completely encompassed within the space occupied by the storage disk stage 131 on the hub 132.

In a central aperture 137 of a frontal wall 138 of the hub 132, which is relatively heavy for reasons of stability, are a ball bearing 139 and a magnetic field seal 140 on the side of the support which is axially oriented away from the drive motor 110. The seal 140 consists of two annular pole pieces 141, 142, a permanent magnet ring 143 located between both these pole pieces, and a magnetic fluid (not shown), which is inserted into an annular gap 144 between the magnetic ring 143 and a stationary shaft 145. Seals of this type are known under the designation of “Ferrofluidic Seal”. An internal space 146 is located within the motor and is sealed on the side of the space oriented away from the frontal wall 138 by means of a motor cover 147, which is inserted into the outer rotor casing 121 and the hub 132, by means, for example, of adhesion. The internal space 146 includes the internal parts such as the stator 111 and permanent magnet 116 as well as bearings 139 and 149. The motor cover 147 abuts with its cylindrical outer edge 247 the lower edge of the rotor casing 121. This allows a particularly easy assembling of the cover 147 within the hub 132. For sealing purposes, adhesive material 190 is placed in a circumferential groove 191 between the cover 147 and the hub 132.

The motor cover 147 is supported on the shaft 145 by means of an additional ball bearing 149. On the side of the ball bearing 149 away from the drive motor 110, there is a magnetic fluid seal 150, which has a construction corresponding to the seal 140. The seals 140, 150 ensure an effective sealing of the motor internal space 146, including the bearings 139, 149, relative to a clean chamber 148 which accommodates the storage disks 134.

The motor cover 147 is provided on the frontal side facing away from the drive motor 110 with an annular groove 151 receiving a control magnet ring 152. The control magnet ring 152 has four sections of alternating circumferential magnetization corresponding to the rotor magnets 116, which run in sequence in the circumferential direction and extend over 90°, so that alternating north and south poles, aligned with poles 119, 120 in the circumferential direction, are provided on the bottom side of the control magnetic ring 152.

A stationary flange 154 is disposed on the lower end of the shaft 145 in FIG. 6. The flange 154 is provided with threaded bores 192 for receiving fastening screws by which the disk storage drive may be connected to the disk drive frame, for example, over a wall delimiting the clean chamber 148, or the like. The flange 154 supports a printed circuit board 155 on its frontal side relative to the motor cover 147. Three rotational position sensors 156, 157, 158 are mounted on the printed circuit board 155. In the embodiment shown, these magnetic field sensors may be Hall generators, Hall-IC's, magnetically controlled photocells, magnetic diodes, or the like, which interact with the control magnet ring 152. The rotational position sensors 156, 157, 158 are suitably positioned in the circumferential direction with regard to the coils 124 to 129 so that the changes of the sensor switching conditions essentially coincide with the zero passages of current in the correspondingly positioned coils. This is attained, in accordance with the embodiment shown in FIG. 5, through the fact that the rotational position sensors are displaced by 15-mech with respect to the center of the apertures of the stator slots 123A to 123F. The rotational position sensors 156, 157, 158 may be supported by a common molded part 159 (see, for example, FIG. 14), preferably a plastic injection molded part. By using a common molded part 159 as the support for the rotational position sensors, their relative positioning with respect to one another can be maintained and reproduced in a particularly precise manner. The printed circuit board 155 is fixed to a ring 193 and is tightly pulled against the flange 154 by screws 194 screwed into a ring 193. An upwardly projecting outer rim 195 of flange 154 defines a hollow cylinder extending into an annular groove 196 provided in the bottom side of the flange 154. Thereby a labyrinth gap 197 is formed which provides for additional sealing between the stationary flange 154 and the rotary motor cover 147.

The connections of the rotational position sensors 156, 157, 158 and/or commutational electronics likewise positioned on the printed circuit board are conducted through one or more apertures 161 of the flange 154 which open into peripheral cutouts of the ring 193. The connections of the stator winding coils 124 to 129 of the drive motor 110 are, on the other hand, conducted outwardly through bores 162, 163 of the stationary shaft 145 out of the internal space of the disk storage drive, which is sealed off by means of the magnetic fluid seals 140, 150. The bores 162, 163 can be dimensioned relatively narrowly, because they only have to accommodate the connections of the stator winding but not the connections of the rotational position sensors and/or the commutation electronics (not shown). Furthermore, the rotational position sensors 156 to 158 located outside of the sealed space 146 can be closely adjusted. An excessive weakening of the shaft 145 is thereby avoided.

In a further modified embodiment shown in FIG. 7, the rotor magnet 116 is located directly within the hub 132′, which itself forms the magnetic shield, and is made of magnetically conductive material, preferably soft iron. The control magnet ring 152′ is located on the frontal side of the flange 133 facing away from the disk mounting section 131 of the hub 132′, and alternately magnetized in the axial direction. In this embodiment, the rotational position sensors 156, 157, 158 are axially opposed to the control magnet ring 152′. The magnetic fluid seal 150 ensures, together with a labyrinth seal 165 which replaces the magnetic fluid seal 140 of the embodiment in FIG. 6, the sealing of the internal space 146, including the bearings 139, 149 relative to the clean chamber 148. The connections of the stator winding 166 are conducted through the bores 162, 163 of the stationary shaft 145. It should be understood that, even in this embodiment, the rotational position sensors 156, 157, 158, can, if desired, be accommodated by a common support corresponding to the molded part 159 (FIG. 14), which support is attached to the printed circuit board 155.

Referring to FIG. 7, an end wall 132A of the hub 132 contains a plurality of threaded holes 332, one of which is shown in FIG. 7. In one exemplary embodiment of the present invention, three threaded holes are circumferentially displaced from one another by 120° mechanical. The holes 332 are used for fitting a clamping device for a number of rigid storage disks (not shown). Under the end wall 132A is located a cover ring 334 which seals the inner area of the motor relative to the clean chamber near the threaded holes 332. In the embodiment of the invention illustrated in FIG. 7, the cover ring 334 is attached to a lower surface of the end wall 132A.

If it is desirable to manufacture the hub 132′ from magnetically non-conducting, or poorly conducting, materials, such as light metal or alloy, a separate iron shield can be provided. This can be seen in the embodiment in FIG. 8. There, the rotor magnet 116 is accommodated in an iron shielding ring 167. The flange 169 supporting the storage disk 134 forms a part, separated from the hub 132, of the cover 170 which accommodates the ball bearing 149. The hub 132 and the cover 170 are closely connected with one another, so that the axial end section of the hub 132, which extends towards the cover 170, engages in an annular groove 171 of the cover 170.

In both embodiments of FIGS. 9 and 10, the control magnet ring 152′ is located in a groove 173 of a bearing support ring 174 on the end of the hub 132. The hub 132 itself forms the magnetic shield, and is accordingly made from conductive material, particularly steel. The control magnet ring 152′ interacts, as shown in FIG. 7, with the rotational position sensors 156, 157, 158, which are not shown in FIGS. 9 and 10. In the embodiment in FIG. 9, the internal space 146 is sealed off by means of the magnetic fluid seals 140, 150, but in the embodiment in FIG. 10, labyrinth seals 175 are provided in their place. The embodiment of FIG. 10 further differs from that of FIG. 9 by the stationary shaft 145′ in the area where it supports the stator lamination stack 112, and the area directly adjoining the same axially, being axially thickened so that the shaft 145 forms shoulders 176, on which the ball bearings 139, 149 are supported.

In the embodiments shown in FIGS. 8, 9, and 10, the connections of the stator winding are, in a manner preferably corresponding to the embodiments shown in FIGS. 6 and 7, brought out externally through recesses of the shafts 145 and 145′.

FIG. 11 depicts an embodiment similar to that of FIG. 11 of copending U.S. Ser. No. 733,231, in which a soft magnetic yoke ring 167 is inserted in the hub 132, the latter forming a disk mounting section 132 and preferably being made of light metal. Both the rotor magnet 116 and the control magnet 152′ are accommodated in the inner circumference of the yoke ring 167. In this embodiment, the printed circuit board 155 together with the rotational position sensors 156, 157, 158 are located within the space 146 sealed by the magnetic fluid seals 140, 150. The circuit board 155 may be suspended from the stator lamination stack 112 by supports 178. A bearing support ring 180 is provided for bringing outwardly the connections 180′ of the stator winding as well as the connections 180 of the rotational position sensors 156, 157, 158 and/or of the electronic commutating means which likewise may be mounted on the printed circuit board 155. The support ring 180 is made of the soft magnetic material, preferably ferromagnetic metal, and surrounds and is firmly fixed to shaft 145. The ball bearing 149 and the magnetic fluid seal 150 are disposed between the cover 147′ and the support ring 180. At least one and preferably a plurality of axially extending apertures 181 are provided in the support ring 180 for receiving the aforementioned connections. After introduction of the connections therein, which together are indicated at 182, the apertures 181 are sealed, e.g. by a potting compound or a mastic. This embodiment completely avoids bores in the stationary shaft 145 and therefore the solid shaft retains its full strength. The provision of a bearing support ring 180 provides for a particularly small eccentricity or run-out of the rotation members. A soft magnetic shield ring 184 is provided on the inside of the front wall 183 of the hub 132.

The embodiment of FIG. 12 corresponds to that of FIG. 7 with the exception that a connection 166 of the stator winding extends through a bearing support ring 185 rather than through the bores in the stationary shaft 145. The ring 185 surrounds the lower portion of the shaft 145. The ball bearing 149 and magnetic fluid seal 150 are disposed in the annular space between the support ring 185 and the ferromagnetic ring 153, which is inserted into hub 132′.

In an embodiment where the rotary position sensors are located externally, the winding leads can also be brought out through an inner bearing support ring encompassing the bearing 149, corresponding to the support ring 180 in FIG. 11. Furthermore, in an embodiment provided with an inboard rotary position sensing arrangement similar to that shown in FIG. 11, a bearing support ring 185 according to FIG. 12 mounted on the stationary shaft 145 and supporting the ball bearing 149 on the inside can be used to bring the connections out to the exterior.

The metal support ring 185 according to FIG. 12 ensures that the rotating parts will display particularly limited runout. The magnetic field of the magnetic liquid seal 150 can be contained in either the ferromagnetic support ring 185 or the ferromagnetic ring 153.

Instead of providing the bearing support rings 180 or 185 with apertures through which the connections can be brought out, the connections can also be potted in the bearing support ring directly.

FIG. 13 shows an embodiment similar to that shown in FIG. 6, of which it is only a further development in many respects.

A particular feature of this further embodiment is the provision of a flat air gap between rotational position indicator or magnetic control ring 152 and the rotational position sensor 156. The printed circuit board 155 is firmly fastened to a stationary flange part 154 with the screw 194. The outside edge of this flange 154 engages in a disk-shaped ring member 147, which may be the motor cover 147 (FIG. 6) in an axial direction like a hollow cylinder, so as to provide a labyrinth gap 197 acting as an additional seal between the stationary flange 154 and the disk-shaped ring member 147. The lower edge of the soft iron outer rotor casing 121 bears on the rotating ring member 147 whose cylindrical outer edge 244 is more easily inserted in the hub body 132 that the arrangement shown in FIG. 6. A mastic 190 is used as the sealant in a peripheral groove between the ring member 147 and the hub 132.

From the user's point of view, the entire motor assembly is fastened by use of appropriate fasteners in the hole 192. The connecting leads from the printed circuit board 155 to the rotational position sensor 156 are brought out through the passage or bore 161 shown with the disked lines, which extends outwardly from an oblique channel 161′ until it terminates in the peripheral apertures in the ring 193 which is brought to bear on the flange 154 by a screw 194.

The ring member 147 corresponds to the elements described in the various embodiments and examples as the covers 170, 147, 147′ and the rings 53, 74. Preferably, therefore, only 2 parts are needed to completely enclose the inner space 146 of the motor other than the stationary shaft 145 and the bearings 139, 149; namely, the rotor casing 132 and the disk-shaped ring member 147.

FIG. 10 shows a ring 175, somewhat L-shaped in section, which rotates together with the outer rotor of the hub, whereby the ring 175 encompasses an inner, essentially complementary mating part 165, so that the longer leg of the outside part 175 is only separated from the stationary shaft by a narrow gap 275. In combination with the inside mating part 165, this arrangement provides an effective labyrinth seal. This is referenced item 175′ in the lower part of FIG. 10, where the basic L-shaped section of the seal is indicated by a solid line and the complementary mating section is referenced 165′. The effectiveness of the labyrinth seal can be enhanced if a projection 175 on the part 175 is provided to project into a recess 165′, of the complementary part 165′. The arrangement may be seen also in the upper part of the drawing. In this way, the need to use a substantially more costly magnetic liquid seal of the type shown in FIG. 9 as items 140 and 150, can be avoided. Of course, the incorporation of a labyrinth seal of this type provided with these two interlocking L-shaped leg profiles has an independent significance in connection with data storage disk drives and is not required by the other design features of this motor. As already mentioned, the additional recesses 165′ provide further enhancement of the sealing action of the labyrinth seals. Elements of this type are manufactured as large volume extrusions or deep drawn die pressings and their cost hardly bears comparison with that of magnetic liquid seals. They provide a good low-cost means of the sealing of the clean chamber, because they can be installed at the points of access to the space inside the motor, either in an axial direction or otherwise.

FIG. 14 is a variant of FIG. 6 primarily in the provision of the groove 151 in the motor cover 147 which receives the magnet ring 152 and allows the rotational position sensor 156 to face the magnet ring across a cylindrical air gap vis-a-vis a planar gap in the embodiment shown in FIG. 6.

This invention is not restricted to the use of magnetic field-sensitive rotational position sensors. It can also be used, for example, with optical sensors.

Although the invention has been described in connection with a preferred embodiment and certain alternatives, other alternatives, modifications, and variations may be apparent to those skilled in the art in view of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations as fall within the spirit and scope of the appended claims.

Claims (40)

What is claimed is:
1. A disk memory drive comprising: a brushless drive motor having an internal space defined therein and a stator including winding means defining magnetically active parts of the drive motor and having a given axial extension, the motor having an outer rotor with an inner circumference, an outer circumference and an open end coaxially encircling the stator and a substantially cylindrical air gap defined between the stator and the rotor, the rotor including a separate non ferromagnetic hub and a soft iron ring element interiorly of said hub and radially located means forming a permanent magnet interiorly of said ring having a predetermined axial extension fixedly connected therewith for magnetic interaction with said winding means; a disk mounting section provided on the outside of said hub for accommodating at least one storage disk for location in a clean chamber surrounding said rotor when the drive motor is mounted for operation, the disk mounting section on the hub along its axial length being adapted to extend through a central aperture of the storage disk, the winding means and the magnet means interacting therewith being disposed for at least half of the axial extension thereof within a space surrounded by the disk mounting section of the hub; and first and second axially separated bearing means having inner and outer races on a shaft rotatably mounting the rotor and the hub on the shaft, the motor also including rotating means interacting with stationary means for determining the rotational position of the rotor, the internal space of said motor, which includes the internal portions thereof with the bearing means, being sealed off against the clean chamber when the drive motor is mounted for operation, a disk-shaped ring member being located with precision at the open end of the rotor between the inner circumference of the rotor and the outer race of one of the axially separated bearing means, and means stationary containing leads establishing electrical connection between the internal space and the outside of the motor.
2. A disk memory drive according to claim 1, wherein said rotating means interacting with said stationary means comprises rotational position indicator means which includes permanent magnet poles disposed on the disk-shaped ring member for rotation therewith and wherein the rotational position sensor means is sensitive to magnetic fields and interacts with the permanent magnet poles.
3. A disk memory drive according to claim 2, wherein the shaft is a stationary shaft.
4. A disk memory drive according to claim 3 wherein the rotational position sensor means is mounted on a printed circuit board opposite the disk-shaped member ring.
5. A disk memory drive according to claim 4, further including electronic commutation devices for the electromagnetization of the stator also being mounted on the printed circuit board.
6. A disk memory drive according to claim 4, wherein the printed circuit board is supported on a flange fixed to the stationary shaft.
7. A disk memory drive according to claim 3, further including a magnetic shield means at least circumferentially surrounding the stator for shielding a clean chamber containing the disk from the magnetic flux of the stator and wherein the stationary shaft is of constant diameter and the outer rotor includes a bell-shaped housing with a substantially closed end and a substantially open end, the stator together with the magnetic shield being firmly mounted to the stationary shaft, the inner race of each bearing being firmly mounted on the stationary shaft on either axial side of the stator, the upper bearing being positioned inwardly adjacent of the closed end of the bell-shaped outer rotor, and the lower bearing being positioned adjacent the open end of the bell-shaped outer rotor.
8. A disk memory drive according to claim 2, wherein the internal space of the motor is sealed by means of a cover located at the open end of the outer rotor, the cover also serving as a bearing mounting flange, and the rotational position indicator means being mounted on the outside of the motor cover with respect to the sealed inner space of the motor.
9. A disk memory drive according to claim 2, wherein the outer rotor includes an outer rotor casing of ferromagnetic material, the outer rotor serving also as the hub, the rotational position indicator being mounted on a lower part of the hub outside the sealed inner space of the motor.
10. A disk memory drive according to claim 2, wherein further comprising a bearing mounting flange having projections in the actual axial direction that project into the disk-shaped ring member, and a labyrinth seal located between the projections and the ring member formed by a combination of cylindrical and radially flat gaps having only dimensions of normal clearances between moving parts.
11. A disk memory drive according to claim 10, wherein the projections on the bearing mounting flange are rectangular in section and extend axially.
12. A disk memory drive according to claim 10, wherein the ring member on which part of the bearing race is mounted is substantially flush in the axial direction with the mounting flange, the ring member being inserted in the outer rotor casing that forms the hub.
13. A disk memory drive having a brushless drive motor, comprising a stator having a predetermined axial extension, a coaxially positioned outer rotor encircling the stator and defining therebetween a substantially cylindrical air gap, the rotor having an inner circumference and an outer circumference and a predetermined axial extension, a cylindrically shaped permanent magnet having a predetermined axial extension disposed adjacent the air gap on the inner circumference of the rotor to rotate therewith and magnetically interact with the stator, a ferromagnetic hub on the outer circumference of the rotor firmly fixed to the motor magnet, the hub radially surrounding the predetermined axial extension of said permanent magnet and being provided on its outer circumference with a disk mounting section which can extend through the central opening in a storage disk to mount at least one storage disk thereon, a shaft having first and second axially separated bearing means mounted thereon rotatably mounting the rotor with hub on the shaft, and seals located axially outside of the axial extension of the first and second bearing means for sealing the space therebetween.
14. A disk memory drive according to claim 13, wherein the shaft is a stationary shaft.
15. A disk memory drive according to claim 14, wherein the seals are magnetic liquid seals.
16. A disk memory drive according to claim 14, wherein the seals are labyrinth seals.
17. A disk memory drive according to claim 14, wherein the stationary shaft projects axially externally of the upper and lower seals.
18. A disk memory drive according to claim 14, wherein the labyrinth seal is formed of a member having a substantially L-shaped cross-section, being mounted on and extending radially from the stationary shaft, the short leg of the L-shaped member extending axially outwardly.
19. A disk memory drive according to claim 16, further including a ring member of L-shaped cross section being provided on the rotor and being opposite and complementary to the stationary mounted L-shaped member, the longer leg of the L-shaped member on the rotor extending inwardly toward the stationary shaft with only a clearance dimension separating the two parts.
20. A disk memory drive according to claim 16, wherein the stationary L-shaped member lies inboard axially and is substantially encompassed by the rotating L-shaped ring, a flat radial labyrinth gap being formed radially between the respective short legs of the L-shaped members.
21. A disk storage device, comprising in combination:
a housing that encloses a clean chamber for providing an environment that is maintained substantially contaminant free;
at least one hard magnetic storage disk provided in said clean chamber for rotation about an axis, said at least one disk having a central opening;
at least one data head that is provided in said clean chamber and that allows information to be stored on and read from said at least one hard magnetic storage disk;
a motor support member forming part of said housing;
a hub member that is provided in said clean room, said hub member having a cylindrical portion that extends through the central opening of said at least one disk whereby said at least one disk is mounted on and rotated by said disk support member, said disk support member including an end wall, wherein a generally enclosed space is defined between adjacent surfaces of said disk support member and said motor support member, and wherein a plurality of holes are formed in said end wall that are generally parallel to said axis and extend through said end wall from said generally enclosed space to said clean room;
a brushless direct current motor that is mounted on said motor support member and that is adapted to rotate said disk support member about said axis, said brushless direct current motor including a stator concentric with said axis, a stator winding disposed on said stator, and a rotor mounted for rotation about said axis relative to said stator, said rotor having a permanent magnetic ring mounted on a magnetically conductive member in a manner such that a generally cylindrical air gap is defined between adjacent surfaces of said stator and said permanent magnetic ring, said brushless direct current motor further including a shaft aligned on an axis and at least one bearing affixed to said shaft;
a disk clamp assembly that is operatively engaged with said plurality of holes to secure said at least one disk to said hub member; and
wherein said hub member further includes a sealing member that is disposed on a surface of said hub member that defines a portion of said generally enclosed space, said sealing member generally reducing the transfer of contaminant particles that are created by the engagement of said disk clamp assembly with said hub member into said clean chamber.
22. The disk storage device of claim 21 wherein said magnetically conductive member provides at least a portion of a magnetic return path for said permanent magnetic ring.
23. The disk storage device of claim 21 wherein said shaft is rotatable about said axis.
24. The disk storage device of claim 21 wherein said permanent magnetic ring is formed from a generally radially oriented permanent magnetic material.
25. The disk storage device of claim 24 wherein said permanent magnetic ring is radially magnetized to form a plurality of permanent magnets of alternating polarity, the radial magnetization of said permanent magnets varies in a substantially trapezoidal manner in a circumferential direction, and a pole gap is defined between the magnetic poles in each of said permanent magnets such that the circumferential extent of each pole gap is small compared to the circumferential extent of the magnetic poles in the pair of permanent magnets adjacent thereto.
26. The disk storage device of claim 25 wherein said permanent magnetic material comprises a mixture of ferrite and an elastic material.
27. The disk storage device of claim 21 said hub member comprises a generally non-magnetically conductive material.
28. The disk storage device of claim 27 wherein said generally non-magnetically conductive material comprises aluminum.
29. The disk storage device of claim 21 wherein said rotor comprises an external rotor.
30. The disk storage device of claim 21 wherein said permanent magnetic ring coaxially surrounds the portion of said stator that forms said air gap.
31. A disk storage device, comprising in combination:
a housing that encloses a clean chamber for providing an environment that is maintained substantially contaminant free;
at least one hard magnetic storage disk provided in said clean chamber for rotation about an axis, said at least one disk having a central opening;
at least one data head that is provided in said clean chamber and that allows information to be stored on and read from said at least one hard magnetic storage disk;
a hub member that is provided in said clean room, said hub member having a cylindrical portion that extends through the central opening of said at least one disk whereby said at least one disk is mounted on and rotated by said disk support member, said disk support member further including an end wall, a plurality of holes being formed in said end wall that are generally parallel to said axis and extend through said end wall;
a brushless direct current motor that is adapted to rotate said disk support member about said axis, said brushless direct current motor including a stator concentric with said axis, a stator winding disposed on said stator, and a rotor mounted for rotation about said axis relative to said stator, said rotor having a permanent magnetic ring mounted on a magnetically conductive member in a manner such that a generally cylindrical air gap is defined between adjacent surfaces of said stator and said permanent magnetic ring, said brushless direct current motor further including a shaft aligned on an axis and at least one bearing affixed to said shaft; and
a cover ring that is disposed on a surface of said hub member so that the transfer of contaminant particles from said hub member into said clean chamber is generally reduced, said contaminant particles being created by the engagement of a disk clamp assembly with said plurality of holes in said hub member.
32. The disk storage device of claim 31 wherein said magnetically conductive member provides at least a portion of a magnetic return path for said permanent magnetic ring.
33. The disk storage device of claim 31 wherein said shaft is rotatable about said axis.
34. The disk storage device of claim 31 wherein said permanent magnetic ring is formed from a generally radially oriented permanent magnetic material.
35. The disk storage device of claim 34 wherein said permanent magnetic ring is radially magnetized to form a plurality of permanent magnets of alternating polarity, the radial magnetization of said permanent magnets varies in a substantially trapezoidal manner in a circumferential direction, and a pole gap is defined between the magnetic poles in each of said permanent magnets such that the circumferential extent of each pole gap is small compared to the circumferential extent of the magnetic poles in the pair of permanent magnets adjacent thereto.
36. The disk storage device of claim 35 wherein said permanent magnetic material comprises a mixture of ferrite and an elastic material.
37. The disk storage device of claim 31 said hub member comprises a generally non-magnetically conductive material.
38. The disk storage device of claim 37 wherein said generally non-magnetically conductive material comprises aluminum.
39. The disk storage device of claim 31 wherein said rotor comprises an external rotor.
40. The disk storage device of claim 31 wherein said permanent magnetic ring coaxially surrounds the portion of said stator that forms said air gap.
US09333397 1980-03-05 1999-06-18 Disk storage device having a hub sealing member feature Expired - Lifetime USRE38673E1 (en)

Priority Applications (23)

Application Number Priority Date Filing Date Title
CH3658/80 1980-05-10
CH365880 1980-05-10
DE3045972 1980-12-05
DE3045972 1980-12-05
US24497181 true 1981-03-18 1981-03-18
DE3135385 1981-09-07
DE19813135385 DE3135385A1 (en) 1980-03-05 1981-09-07 Disc storage unit
US06326559 US4519010A (en) 1980-12-05 1981-12-02 Driving mechanism for magnetic hard disc memories
US41209382 true 1982-08-27 1982-08-27
CH2680/84 1984-06-01
CH268084 1984-06-01
CH1374/85 1985-03-30
CH137485 1985-03-30
US73323185 true 1985-05-10 1985-05-10
US06767671 US4658312A (en) 1981-09-07 1985-08-21 Disk storage drive
US07038049 US4843500A (en) 1981-09-07 1987-04-14 Disk storage drive
US07201736 US4894738A (en) 1981-09-07 1988-06-02 Disk storage drive
US61762989 true 1989-06-06 1989-06-06
US07402917 US5001581A (en) 1981-09-07 1989-09-05 Disk storage drive
US07653100 US5173814A (en) 1981-09-07 1991-02-08 Disk storage drive having internal electrical connection passages and contamination seals at ends of the motor
US36022694 true 1994-12-20 1994-12-20
US08819099 USRE37058E1 (en) 1980-05-10 1997-03-04 Disk storage device having contamination seals
US09333397 USRE38673E1 (en) 1980-05-10 1999-06-18 Disk storage device having a hub sealing member feature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09333397 USRE38673E1 (en) 1980-05-10 1999-06-18 Disk storage device having a hub sealing member feature

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US07653100 Reissue US5173814A (en) 1980-03-05 1991-02-08 Disk storage drive having internal electrical connection passages and contamination seals at ends of the motor

Publications (1)

Publication Number Publication Date
USRE38673E1 true USRE38673E1 (en) 2004-12-21

Family

ID=33515038

Family Applications (1)

Application Number Title Priority Date Filing Date
US09333397 Expired - Lifetime USRE38673E1 (en) 1980-03-05 1999-06-18 Disk storage device having a hub sealing member feature

Country Status (1)

Country Link
US (1) USRE38673E1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040189105A1 (en) * 2003-03-25 2004-09-30 Twinbird Corporation Fixation framework for ring-shaped permanent magnet
US20080211325A1 (en) * 2003-12-05 2008-09-04 Valeo Systemes D'essuyage Electromotive Drive
US7684146B1 (en) * 2005-11-22 2010-03-23 Maxtor Corporation Hermetic seal for a spindle motor of a disk drive
US20100109465A1 (en) * 2008-10-30 2010-05-06 System General Corporation Motor structure and fan
US20150171713A1 (en) * 2012-05-25 2015-06-18 Robert Bosch Gmbh Electronically commutated dc motor with shielding

Citations (182)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB393617A (en) 1930-12-08 1933-06-07 Gen Electric Improvements in and relating to electric motors
US3250929A (en) 1963-10-28 1966-05-10 Syncro Corp Heat sink construction for generator regulators
US3290525A (en) 1963-10-11 1966-12-06 Gustav H Sudmeier Alternator structure
DE1954409U (en) 1966-11-11 1967-02-02 Brieden & Co Maschf K Foerderrohr with basalt insert, in particular blasversatzrohr.
US3329845A (en) 1964-03-16 1967-07-04 Lear Jet Corp Self-shielding motor
DE1244283B (en) 1963-09-10 1967-07-13 Hitachi Ltd Brushless electric motor with means for speed control and speed stabilization
US3527969A (en) 1967-10-27 1970-09-08 Papst Motoren Kg Soundproofed housing for electric motors
DE2028228A1 (en) 1969-06-10 1970-12-17
US3596121A (en) 1969-09-10 1971-07-27 Robbins & Myers Electric induction motor
US3634873A (en) 1969-06-12 1972-01-11 Sanyo Electric Co Hermetically sealed dc-motor-compressor unit
US3691542A (en) 1970-11-02 1972-09-12 Diablo Systems Inc Magnetic memory disk drive apparatus with reduced r. f. noise
US3706085A (en) 1971-06-09 1972-12-12 Gen Instrument Corp Magnetic holddown for magnetic disc system
US3732025A (en) 1971-06-15 1973-05-08 Miles Machinery Co Method for machining valve body castings
DE2319579A1 (en) 1972-04-20 1973-10-25 Mettoy Co Ltd electric motor
US3805134A (en) 1971-09-18 1974-04-16 Victor Co Ltd Brushless dc motor using hall elements
US3840761A (en) 1972-05-25 1974-10-08 Papst Motoren Kg Axial air gap,collector-less d-c motor
US3845339A (en) 1971-09-01 1974-10-29 Papst Motoren Kg Permanent magnet rotor electric motor
US3849800A (en) 1971-03-13 1974-11-19 Ibm Magnetic disc apparatus
DE2346380A1 (en) 1973-05-23 1974-11-28 Papst Motoren Kg Brushless DC motor
US3860843A (en) 1970-06-26 1975-01-14 Matsushita Electric Ind Co Ltd Rotating electric machine with reduced cogging
US3864610A (en) 1972-06-30 1975-02-04 Fuji Electric Co Ltd Speed control device for brushless dc motor
US3867748A (en) 1974-03-07 1975-02-25 Libbey Owens Ford Co Supporting and driving frangible rollers
US3873897A (en) 1972-05-25 1975-03-25 Papst Motoren Kg Collector-less D-C motor
US3888403A (en) 1972-11-24 1975-06-10 Sony Corp Tape drive system
US3891905A (en) 1972-12-08 1975-06-24 Papst Motoren Kg Brushless d-c motor
US3940670A (en) 1973-09-07 1976-02-24 Canon Kabushiki Kaisha Speed control apparatus for a D.C. motor having hall generators
US3967200A (en) 1973-10-26 1976-06-29 Matsushita Electric Industrial Co., Ltd. Speed detector for use with miniature DC motor
US3977804A (en) 1974-03-03 1976-08-31 Miyakawa Industry Company, Ltd. Multiple spindle drilling machine for wide flange beams
US3988024A (en) 1974-06-14 1976-10-26 Tokyo Shibaura Electric Co., Ltd. Turntable apparatus
US4005490A (en) 1975-05-15 1977-01-25 Sperry Rand Corporation Magnetic disc memory
US4008422A (en) 1974-02-18 1977-02-15 Tanaka Instrument Co., Ltd. Fractional horsepower brushless direct current motor
US4031558A (en) 1974-08-27 1977-06-21 Sony Corporation Head drum assembly with electrical noise shield
US4034411A (en) 1975-07-11 1977-07-05 International Business Machines Corporation Magnetic disk information storage apparatus
GB1486070A (en) 1975-04-02 1977-09-14 Ibm Magnetic disc file including a clean gas system
US4062049A (en) 1976-04-02 1977-12-06 Burroughs Corporation Integrated Disk File Module and memory storage system
DE2612464C2 (en) 1976-03-24 1978-03-23 Papst-Motoren Kg, 7742 St Georgen
US4092572A (en) 1975-09-04 1978-05-30 Pioneer Electronic Corporation Brushless D.C. motor driving system
US4101945A (en) 1976-09-07 1978-07-18 Sycor, Inc. Drive spindle assembly for disc file
US4115715A (en) 1974-04-08 1978-09-19 Papst-Motoren Kg Brushless d. c. motor
US4130845A (en) 1977-07-08 1978-12-19 Microdata Corporation Disc cabinet recirculating air flow system
US4136366A (en) 1976-09-08 1979-01-23 Hitachi, Ltd. Cassette tape recorder and method for producing the same
DE2840057A1 (en) 1977-09-14 1979-03-22 Sony Corp Brushless DC motor
DE2841137A1 (en) 1977-09-22 1979-04-05 Sony Corp record player
US4150406A (en) 1977-11-30 1979-04-17 Stollorz Herbert R Transducer lifting means employing plural flexures
US4167692A (en) 1976-11-01 1979-09-11 Sony Corporation Brush-less DC motor
US4174484A (en) 1975-07-24 1979-11-13 Papst-Motoren Kg Motor with a disk rotor
US4181867A (en) 1975-07-21 1980-01-01 Papst-Motoren Kg Brushless direct-current motor
US4185308A (en) 1976-09-24 1980-01-22 Tokyo Shibaura Electric Co., Ltd. Enclosed-type magnetic disc recording and/or reproducing apparatus
US4190870A (en) 1978-07-05 1980-02-26 International Business Machines Corporation Disk drive assembly
US4194225A (en) 1978-06-06 1980-03-18 International Memories, Inc. Housing for disk drive unit
US4193646A (en) 1976-11-20 1980-03-18 Teldix Gmbh Flywheel with spring loaded bearing
US4197489A (en) 1978-01-27 1980-04-08 Mfe Corporation Spindle drive system
GB1572586A (en) 1978-03-22 1980-07-30 Mfe Corp Disc drive system
US4216512A (en) 1978-08-21 1980-08-05 Sycor, Inc. Disc recorder with brushless DC motor drive
US4228387A (en) 1977-09-14 1980-10-14 Exxon Research & Engineering Co. Variable reluctance stepper motor drive and method of operation as a DC brushless motor
FR2453527A1 (en) 1979-04-02 1980-10-31 Computer Peripherie Tech Motor mechanism comprising a motor induced dish
US4249221A (en) 1979-04-23 1981-02-03 Sli Industries, Inc. Method and apparatus for preventing contamination of a rotating magnetic disc
US4252353A (en) 1979-04-26 1981-02-24 Ferrofluidics Corporation Self-activating ferrofluid seals
US4268878A (en) 1979-06-01 1981-05-19 New World Computer Company, Inc. Gas circulation and filtration apparatus for magnetic disc recording systems
US4275339A (en) 1979-12-21 1981-06-23 International Business Machines Corporation Bifilar brushless DC motor
US4280072A (en) 1977-05-26 1981-07-21 Matsushita Electric Industrial Co., Ltd. Rotating electric machine
US4280155A (en) 1979-06-04 1981-07-21 Memorex Mini Disc Drive Corp. Method of improving air flow in compact disc drive
US4282554A (en) 1979-01-26 1981-08-04 Priam Enclosed disc drive with improved air flow
US4283644A (en) 1978-09-22 1981-08-11 Sony Corporation DC Motor
US4285016A (en) 1979-06-04 1981-08-18 Microcomputer Systems Corp. Disc, tape and hybrid disc-tape memory apparatus and drive assembly
US4286184A (en) 1978-11-21 1981-08-25 Siemens Aktiengesellschaft Electronic motor having a multi-pole external rotor
DE2749729C3 (en) 1977-11-07 1981-08-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
GB1604121A (en) 1977-04-08 1981-12-02 Sony Corp Dc motors
US4307425A (en) 1978-10-02 1981-12-22 Nippon Telegraph & Telephone Public Corporation Breathing device for a closed housing of a magnetic memory device
US4317146A (en) 1979-12-03 1982-02-23 Micropolis Corporation Compact magnetic disk storage system
US4329722A (en) 1980-05-15 1982-05-11 Priam Corporation Enclosed disc drive having combination filter assembly
US4329604A (en) 1979-08-06 1982-05-11 Micropolis Corporation Low loss brushless DC motor
US4336470A (en) 1976-06-15 1982-06-22 Giorgio Gutris Rotary electric machine of the in-out type provided with integral stator supporting means, component for said machine and method for assembling the same
US4337491A (en) 1978-11-03 1982-06-29 International Memories, Inc. Brushless D.C. motor assembly
DE3144629A1 (en) 1980-12-05 1982-07-08 Papst Motoren Gmbh & Co Kg Drive means for magnetic disk storage
US4352133A (en) 1977-07-18 1982-09-28 Nixdorf Computer Ag Magnetic disc memory
US4356437A (en) 1979-07-20 1982-10-26 Hitachi, Ltd. Control circuit for DC motors
US4359761A (en) 1978-07-27 1982-11-16 Papst Motoren Kg Electric motor with multiple shafts
US4363057A (en) 1979-07-16 1982-12-07 International Business Machines Corporation Recirculating filter duct design
US4363046A (en) 1980-05-24 1982-12-07 Sony Corporation Deflectable transducer head assembly
US4365187A (en) 1980-05-15 1982-12-21 Rotron Incorporated Brushless D.C. motor
US4365916A (en) 1980-02-26 1982-12-28 Miyakawa Industry Co., Ltd. Turning type multi-spindle attachment
US4366516A (en) 1979-05-29 1982-12-28 Hitachi, Ltd. Precision machinery component
DE2647675C3 (en) 1975-10-23 1983-01-20 Hitachi, Ltd., Tokyo, Jp
DE3135385A1 (en) 1980-03-05 1983-03-17 Papst Motoren Gmbh & Co Kg Disc storage unit
EP0015739B1 (en) 1979-03-09 1983-04-27 Skf (U.K.) Limited Labyrinth seals
EP0069545A3 (en) 1981-07-02 1983-04-27 Irwin International, Inc. Disc recorder with integral cartridge tape module
US4394594A (en) 1975-07-24 1983-07-19 Papst-Motoren Kg Motor with a disk rotor
US4396959A (en) 1980-09-24 1983-08-02 Quantum Corporation Data transducer position control system for rotating disk data storage equipment
US4396964A (en) 1980-07-02 1983-08-02 Storage Technology Corporation Recirculating air system for magnetic disk drive
US4398134A (en) 1979-05-15 1983-08-09 Papst-Motoren Kg Two-pulse permanent magnet brushless D-C motor
GB2013388B (en) 1978-01-26 1983-09-28 Exxon Research Engineering Co Magntetic data storage disc drive
EP0094484A1 (en) 1982-05-17 1983-11-23 International Business Machines Corporation Self-ventilated recirculating airflow system
US4430603A (en) 1980-07-18 1984-02-07 Mueller Rolf Brushless direct current motor having a once-around pulse generating means
US4445159A (en) 1980-11-29 1984-04-24 Hitachi, Ltd. Chassis for video tape recorder
GB2072924B (en) 1980-03-27 1984-05-23 Sony Corp Optical discs and disc drive mechanisms employing magnetic drive coupling
DE2225442C3 (en) 1972-05-25 1984-06-28 Papst-Motoren Gmbh & Co Kg, 7742 St Georgen, De
US4497138A (en) 1980-11-05 1985-02-05 Buderus Aktiengesellschaft Apparatus for simultaneously grinding inner and outer workpiece surfaces
GB2075240B (en) 1980-03-05 1985-03-13 Papst Motoren Kg Disc storage drive
US4438542A (en) 1980-03-05 1985-03-27 Papst-Motoren Gmbh & Co. Kg Disk storage drive
US4516177A (en) 1982-09-27 1985-05-07 Quantum Corporation Rotating rigid disk data storage device
US4519010A (en) 1980-12-05 1985-05-21 Papst-Motoren Gmbh & Co. Kg Driving mechanism for magnetic hard disc memories
US4529900A (en) 1978-07-29 1985-07-16 Sony Corporation Brushless motor
US4535373A (en) 1980-12-29 1985-08-13 Papst-Motoren Gmbh & Co. Kg Labyrinth seal in disk storage drive
EP0151258A1 (en) 1984-02-07 1985-08-14 Siemens Aktiengesellschaft Divided housing with peripheral ring seal for magnetic disc memory
EP0151260A1 (en) 1984-02-07 1985-08-14 Siemens Aktiengesellschaft Magnetic disc memory comprising a stack of discs with double sided bearing within a partially resilient casing
US4553183A (en) 1982-06-28 1985-11-12 Atasi Corporation Memory storage apparatus having improved housing and base plate arrangement
US4554473A (en) 1980-05-10 1985-11-19 Papst-Motoren Gmbh & Co. Kg Brushless direct current motor system
US4562496A (en) 1982-02-25 1985-12-31 Matsushita Electric Industrial Co., Ltd. Magnetic tape recording and/or reproducing apparatus
USRE32075E (en) 1980-09-24 1986-01-28 Quantum Corporation Data transducer position control system for rotating disk data storage equipment
DE3538480A1 (en) 1984-10-29 1986-04-30 Priam Corp Grounded main memory plate arrangement
US4599664A (en) * 1982-03-01 1986-07-08 Papst-Motoren Gmbh & Co Kg Disk storage drive
DE2617860C2 (en) 1976-04-23 1986-07-10 Flux-Geraete Gmbh, 7000 Stuttgart, De
US4607182A (en) 1984-05-26 1986-08-19 Georg Muller Nurnberg Gmbh Motor spindle with integrated bearing races
US4616538A (en) 1984-04-27 1986-10-14 Uma Corporation Chuck assembly
US4656545A (en) 1983-07-28 1987-04-07 Nippon Seiko Kabushiki Kaisha Magnetic disc memory device
US4658312A (en) 1981-09-07 1987-04-14 Papst-Motoren Gmbh & Co. K.G. Disk storage drive
US4672487A (en) 1984-02-07 1987-06-09 Siemens Aktiengesellschaft Magnetic disk memory having a disk pack hub seated at both sides of a disk pack
US4672250A (en) 1984-11-15 1987-06-09 A. O. Smith Corporation Drive motor bearing apparatus
US4701653A (en) 1982-07-27 1987-10-20 Papst-Motoren Gmbh & Co Kg Disk drive with internal brake and static discharge
US4717977A (en) 1986-09-25 1988-01-05 Micropolis Corporation High capacity Winchester disk drive
US4725904A (en) 1981-10-05 1988-02-16 Tandon Corporation Magnetic disk memory apparatus with improved contamination control
US4739425A (en) 1984-02-07 1988-04-19 Siemens Aktiengesellschaft Magnetic disk memory comprising a membrane spring-braced bearing of a disk pack which is rotatably mounted at both ends
US4739427A (en) 1987-01-14 1988-04-19 Micropolis Corporation High capacity hard disk construction
US4739203A (en) 1986-10-24 1988-04-19 Shicoh Engineering Co. Ltd. Single-phase brushless motor with cogging features
US4743995A (en) 1985-10-31 1988-05-10 International Business Machines Corporation Disk file with in-hub motor
DE2804787C2 (en) 1977-03-17 1988-05-19 Papst-Motoren Gmbh & Co Kg, 7742 St Georgen, De
USRE32702E (en) 1978-11-03 1988-06-21 Papst-Motoren Gmbh & Co Kg Brushless D.C. motor assembly
US4754351A (en) 1984-08-22 1988-06-28 Maxtor Corporation Method and apparatus for controlling radial disk displacement in Winchester disk drives
US4779165A (en) 1981-09-07 1988-10-18 Papst-Motoren Gmbh & Co. Kg Disk storage drive
US4797762A (en) 1987-09-22 1989-01-10 Micropolis Corporation Stress free winchester drive shaft mounting
US4805055A (en) 1986-11-24 1989-02-14 Maxtor Winchester disc drive actuator structure
US4814652A (en) 1987-02-27 1989-03-21 Maxtor Corporation Disk drive motor with thermally matched parts
US4829657A (en) 1987-02-27 1989-05-16 Maxtor Corporation In-spindle motor assembly for disk drive and method for fabricating the same
EP0172459B1 (en) 1984-07-31 1990-02-14 Hitachi, Ltd. Spindle assembly for magnetic disks
US4905110A (en) * 1988-03-25 1990-02-27 Magnetic Peripherals Inc. Disk drive spindle motor
US4928029A (en) 1987-02-27 1990-05-22 Maxtor Corporation In-spindle motor assembly for disk drive and method for fabricating
US4949000A (en) 1988-07-18 1990-08-14 Mueller And Smith, Lpa D.C. motor
US4991211A (en) 1984-11-29 1991-02-05 Papst-Motoren Gmbh & Co. Kg Integrated driving system for signal-processing devices
EP0263932B1 (en) 1986-10-14 1992-07-15 International Business Machines Corporation Disk file including a filtration system
DE3122049C2 (en) 1980-06-06 1992-12-10 Papst-Motoren Gmbh & Co Kg, 7742 St Georgen, De
US5173814A (en) 1981-09-07 1992-12-22 Papst-Motoren Gmbh & Co. Kg Disk storage drive having internal electrical connection passages and contamination seals at ends of the motor
DE3314079C2 (en) 1982-04-19 1993-03-11 Papst-Motoren Gmbh & Co Kg, 7742 St Georgen, De
US5216557A (en) 1981-09-07 1993-06-01 Papst-Motoren Gmbh & Co. Kg Disk storage device having a brushless dc drive motor
US5251081A (en) 1991-05-31 1993-10-05 International Business Machines Corporation Spindle grounding device
USRE34412E (en) 1981-09-07 1993-10-19 Papst-Motoren Gmbh & Co. Kg Disk storage drive having motor drive with non-corrodible hub
US5382853A (en) 1980-06-06 1995-01-17 Papst Licencing Gmbh Brushless DC drive motor with external rotor for use in disc drives and like devices
US5424887A (en) 1980-03-05 1995-06-13 Papst Licensing Gmbh Disk storage drive
USRE35792E (en) 1981-09-07 1998-05-12 Papst Licensing, Gmbh Disk storage drive
JP4887809B2 (en) 2006-01-31 2012-02-29 沖電気工業株式会社 The paper sheet stacking apparatus
JP4886510B2 (en) 2003-07-21 2012-02-29 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングRobert Bosch Gmbh Method and apparatus for determining the position and / or the intended position of the relative vehicle relative to the roadway of the opposite traffic lane of multi-lane during the parking process
JP4934714B2 (en) 2008-12-18 2012-05-16 キヤノン株式会社 The information processing apparatus and a control method and program
JP4946716B2 (en) 2007-08-10 2012-06-06 日産自動車株式会社 Under cover support structure
JP4971909B2 (en) 2007-08-24 2012-07-11 キヤノン株式会社 Game program, as well as computer equipment and its control method
JP4985110B2 (en) 2007-06-01 2012-07-25 住友電気工業株式会社 Vehicle driving support system, a driving support device, a vehicle and a vehicle driving support method
JP5090905B2 (en) 2004-05-19 2012-12-05 クラリアント ファイナンス (ビーブイアイ) リミティド Bridged monoazo dye
JP5126669B2 (en) 2008-02-15 2013-01-23 株式会社ニコン Infrared zoom lens
JP5133410B2 (en) 2007-07-20 2013-01-30 カーディアック ペースメイカーズ, インコーポレイテッド Devices and methods for respiratory therapy
JP5157011B2 (en) 2008-04-28 2013-03-06 株式会社小松製作所 Surge voltage suppression circuit of the switching device
JP5162002B2 (en) 2011-05-20 2013-03-13 藤倉ゴム工業株式会社 Method for producing a cable sealing member
JP5184516B2 (en) 2006-05-16 2013-04-17 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Simplified biphasic defibrillator circuit has a make-only switching
JP5242209B2 (en) 2008-03-24 2013-07-24 古河電気工業株式会社 The method of manufacturing an optical fiber
JP5250704B2 (en) 2009-03-13 2013-07-31 ローゼンベルガー ホーフフレクベンツテクニーク ゲーエムベーハー ウント ツェーオー カーゲー Sealing of the contact pins which are spring-biased
JP5323010B2 (en) 2010-07-05 2013-10-23 レノボ・シンガポール・プライベート・リミテッド The information input apparatus, the screen arrangement methods, and computer-executable program
JP5339727B2 (en) 2004-12-31 2013-11-13 サン−ゴバン グラス フランス The method for bending a glass sheet by suction
JP5351719B2 (en) 2009-11-25 2013-11-27 パナソニック株式会社 Automotive lighting device
JP5355509B2 (en) 2010-07-06 2013-11-27 株式会社 ナミ潜水社 Water stop apparatus of the water tank
JP5355106B2 (en) 2008-01-29 2013-11-27 ネステク ソシエテ アノニム System and a control method for such a system to vary the fluid temperature
JP5357010B2 (en) 2006-04-24 2013-12-04 コーニンクレッカ フィリップス エヌ ヴェ Coil system and a magnetic resonance system
JP5370309B2 (en) 2010-07-30 2013-12-18 三菱電機株式会社 Hand-drying apparatus
JP5376809B2 (en) 2008-02-13 2013-12-25 エヌ・ティ・ティ・コミュニケーションズ株式会社 The wireless terminal device, the method and program
JP5441619B2 (en) 2009-10-30 2014-03-12 ソニーモバイルコミュニケーションズ, エービー Short-range wireless communication device, short-range wireless communication system, a control method for near field communication device, the control program of the near field communication device, and the mobile phone terminal
JP5458011B2 (en) 2007-08-03 2014-04-02 ビオ−ラド・イノベーションズ Antibodies to the new BNP (1-32) epitope and the epitope
JP5525725B2 (en) 2007-12-17 2014-06-18 ランクセス・インコーポレーテッド Diene - Hydrogenation of the base polymer latex
JP5543360B2 (en) 2007-12-06 2014-07-09 コーニンクレッカ フィリップス エヌ ヴェ Apparatus for applying energy to an object, method and computer program
JP5753876B2 (en) 2013-07-03 2015-07-22 京楽産業.株式会社 Game machine
JP5822571B2 (en) 2011-07-07 2015-11-24 キヤノン株式会社 Sheet feeding apparatus and an image forming apparatus
JP5830965B2 (en) 2011-06-28 2015-12-09 日産自動車株式会社 Braking force control device
JP5830312B2 (en) 2011-09-05 2015-12-09 染矢電線株式会社 Wire with terminals
JP5922273B2 (en) 2008-11-18 2016-05-24 住友化学株式会社 Photosensitive resin composition
JP6120871B2 (en) 2011-12-15 2017-04-26 ビーエーエスエフ ソシエタス・ヨーロピアBasf Se Adverse prepared from biological agents and polyalkoxylates of the melt, solid pesticidal formulation which may comprise polycarboxylate complexed with liquid adjuvant killing
JP6134771B2 (en) 1997-09-23 2017-05-24 ザ デパートメント オブ ベテランズ アフェアズ Composition for maintaining the organ, the method and apparatus

Patent Citations (222)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB393617A (en) 1930-12-08 1933-06-07 Gen Electric Improvements in and relating to electric motors
DE1244283B (en) 1963-09-10 1967-07-13 Hitachi Ltd Brushless electric motor with means for speed control and speed stabilization
US3290525A (en) 1963-10-11 1966-12-06 Gustav H Sudmeier Alternator structure
US3250929A (en) 1963-10-28 1966-05-10 Syncro Corp Heat sink construction for generator regulators
US3329845A (en) 1964-03-16 1967-07-04 Lear Jet Corp Self-shielding motor
DE1954409U (en) 1966-11-11 1967-02-02 Brieden & Co Maschf K Foerderrohr with basalt insert, in particular blasversatzrohr.
US3527969A (en) 1967-10-27 1970-09-08 Papst Motoren Kg Soundproofed housing for electric motors
US3527969B1 (en) 1967-10-27 1985-04-16
DE2028228A1 (en) 1969-06-10 1970-12-17
US3634873A (en) 1969-06-12 1972-01-11 Sanyo Electric Co Hermetically sealed dc-motor-compressor unit
US3596121A (en) 1969-09-10 1971-07-27 Robbins & Myers Electric induction motor
US3860843A (en) 1970-06-26 1975-01-14 Matsushita Electric Ind Co Ltd Rotating electric machine with reduced cogging
GB1328717A (en) 1970-11-02 1973-08-30 Diablo Systems Inc Magnetic memory disc drive apparatus with reduced rf noise
US3691542A (en) 1970-11-02 1972-09-12 Diablo Systems Inc Magnetic memory disk drive apparatus with reduced r. f. noise
US3849800A (en) 1971-03-13 1974-11-19 Ibm Magnetic disc apparatus
US3706085A (en) 1971-06-09 1972-12-12 Gen Instrument Corp Magnetic holddown for magnetic disc system
US3732025A (en) 1971-06-15 1973-05-08 Miles Machinery Co Method for machining valve body castings
US3845339A (en) 1971-09-01 1974-10-29 Papst Motoren Kg Permanent magnet rotor electric motor
GB1407431A (en) 1971-09-01 1975-09-24 Papst Motoren Kg Electric motor
US3805134A (en) 1971-09-18 1974-04-16 Victor Co Ltd Brushless dc motor using hall elements
DE2319579A1 (en) 1972-04-20 1973-10-25 Mettoy Co Ltd electric motor
US3922590A (en) 1972-04-20 1975-11-25 Mettoy Co Ltd Electrical systems and apparatus
GB1434192A (en) 1972-04-20 1976-05-05 Mettoy Co Ltd Electric motors
US3840761A (en) 1972-05-25 1974-10-08 Papst Motoren Kg Axial air gap,collector-less d-c motor
DE2225442C3 (en) 1972-05-25 1984-06-28 Papst-Motoren Gmbh & Co Kg, 7742 St Georgen, De
US3873897A (en) 1972-05-25 1975-03-25 Papst Motoren Kg Collector-less D-C motor
US3864610A (en) 1972-06-30 1975-02-04 Fuji Electric Co Ltd Speed control device for brushless dc motor
US3888403A (en) 1972-11-24 1975-06-10 Sony Corp Tape drive system
US3891905A (en) 1972-12-08 1975-06-24 Papst Motoren Kg Brushless d-c motor
DE2346380A1 (en) 1973-05-23 1974-11-28 Papst Motoren Kg Brushless DC motor
US3940670A (en) 1973-09-07 1976-02-24 Canon Kabushiki Kaisha Speed control apparatus for a D.C. motor having hall generators
US3967200A (en) 1973-10-26 1976-06-29 Matsushita Electric Industrial Co., Ltd. Speed detector for use with miniature DC motor
US4008422A (en) 1974-02-18 1977-02-15 Tanaka Instrument Co., Ltd. Fractional horsepower brushless direct current motor
US3977804A (en) 1974-03-03 1976-08-31 Miyakawa Industry Company, Ltd. Multiple spindle drilling machine for wide flange beams
US3867748A (en) 1974-03-07 1975-02-25 Libbey Owens Ford Co Supporting and driving frangible rollers
US4115715A (en) 1974-04-08 1978-09-19 Papst-Motoren Kg Brushless d. c. motor
US3988024A (en) 1974-06-14 1976-10-26 Tokyo Shibaura Electric Co., Ltd. Turntable apparatus
US4031558A (en) 1974-08-27 1977-06-21 Sony Corporation Head drum assembly with electrical noise shield
GB1486070A (en) 1975-04-02 1977-09-14 Ibm Magnetic disc file including a clean gas system
US4054931A (en) 1975-04-02 1977-10-18 International Business Machines Corporation Gas filtering arrangement for magnetic disk information storage apparatus
US4005490A (en) 1975-05-15 1977-01-25 Sperry Rand Corporation Magnetic disc memory
US4034411A (en) 1975-07-11 1977-07-05 International Business Machines Corporation Magnetic disk information storage apparatus
US4181867A (en) 1975-07-21 1980-01-01 Papst-Motoren Kg Brushless direct-current motor
US4394594A (en) 1975-07-24 1983-07-19 Papst-Motoren Kg Motor with a disk rotor
US4174484A (en) 1975-07-24 1979-11-13 Papst-Motoren Kg Motor with a disk rotor
US4092572A (en) 1975-09-04 1978-05-30 Pioneer Electronic Corporation Brushless D.C. motor driving system
DE2639055B2 (en) 1975-09-04 1980-06-19 Pioneer Electronic Corp., Tokio
DE2647675C3 (en) 1975-10-23 1983-01-20 Hitachi, Ltd., Tokyo, Jp
DE2612464C2 (en) 1976-03-24 1978-03-23 Papst-Motoren Kg, 7742 St Georgen
US4099104A (en) 1976-03-24 1978-07-04 Papst-Motoren Kg Brushless d-c motor system
US4062049A (en) 1976-04-02 1977-12-06 Burroughs Corporation Integrated Disk File Module and memory storage system
DE2617860C2 (en) 1976-04-23 1986-07-10 Flux-Geraete Gmbh, 7000 Stuttgart, De
US4336470A (en) 1976-06-15 1982-06-22 Giorgio Gutris Rotary electric machine of the in-out type provided with integral stator supporting means, component for said machine and method for assembling the same
US4101945A (en) 1976-09-07 1978-07-18 Sycor, Inc. Drive spindle assembly for disc file
US4136366A (en) 1976-09-08 1979-01-23 Hitachi, Ltd. Cassette tape recorder and method for producing the same
US4185308A (en) 1976-09-24 1980-01-22 Tokyo Shibaura Electric Co., Ltd. Enclosed-type magnetic disc recording and/or reproducing apparatus
US4167692A (en) 1976-11-01 1979-09-11 Sony Corporation Brush-less DC motor
US4193646A (en) 1976-11-20 1980-03-18 Teldix Gmbh Flywheel with spring loaded bearing
DE2804787C2 (en) 1977-03-17 1988-05-19 Papst-Motoren Gmbh & Co Kg, 7742 St Georgen, De
GB1604121A (en) 1977-04-08 1981-12-02 Sony Corp Dc motors
US4280072A (en) 1977-05-26 1981-07-21 Matsushita Electric Industrial Co., Ltd. Rotating electric machine
US4130845A (en) 1977-07-08 1978-12-19 Microdata Corporation Disc cabinet recirculating air flow system
US4352133A (en) 1977-07-18 1982-09-28 Nixdorf Computer Ag Magnetic disc memory
US4228387A (en) 1977-09-14 1980-10-14 Exxon Research & Engineering Co. Variable reluctance stepper motor drive and method of operation as a DC brushless motor
GB2005482B (en) 1977-09-14 1982-04-07 Sony Corp Brushless motors
DE2840057A1 (en) 1977-09-14 1979-03-22 Sony Corp Brushless DC motor
US4417167A (en) 1977-09-14 1983-11-22 Sony Corporation DC Brushless motor
DE2841137A1 (en) 1977-09-22 1979-04-05 Sony Corp record player
US4194743A (en) 1977-09-22 1980-03-25 Sony Corporation Record player
DE2749729C3 (en) 1977-11-07 1981-08-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
US4150406A (en) 1977-11-30 1979-04-17 Stollorz Herbert R Transducer lifting means employing plural flexures
GB2013388B (en) 1978-01-26 1983-09-28 Exxon Research Engineering Co Magntetic data storage disc drive
FR2415859B1 (en) 1978-01-26 1985-03-22 Exxon Research Engineering Co
US4197489A (en) 1978-01-27 1980-04-08 Mfe Corporation Spindle drive system
GB1572586A (en) 1978-03-22 1980-07-30 Mfe Corp Disc drive system
US4194225A (en) 1978-06-06 1980-03-18 International Memories, Inc. Housing for disk drive unit
US4190870A (en) 1978-07-05 1980-02-26 International Business Machines Corporation Disk drive assembly
US4359761A (en) 1978-07-27 1982-11-16 Papst Motoren Kg Electric motor with multiple shafts
US4529900A (en) 1978-07-29 1985-07-16 Sony Corporation Brushless motor
US4216512A (en) 1978-08-21 1980-08-05 Sycor, Inc. Disc recorder with brushless DC motor drive
GB2032197B (en) 1978-09-22 1983-08-17 Sony Corp Dc motors
US4283644A (en) 1978-09-22 1981-08-11 Sony Corporation DC Motor
US4307425A (en) 1978-10-02 1981-12-22 Nippon Telegraph & Telephone Public Corporation Breathing device for a closed housing of a magnetic memory device
US4337491A (en) 1978-11-03 1982-06-29 International Memories, Inc. Brushless D.C. motor assembly
USRE32702E (en) 1978-11-03 1988-06-21 Papst-Motoren Gmbh & Co Kg Brushless D.C. motor assembly
USRE32702F1 (en) 1978-11-03 1991-03-05 Brushless d.c.motor assembly
US4286184A (en) 1978-11-21 1981-08-25 Siemens Aktiengesellschaft Electronic motor having a multi-pole external rotor
US4282554A (en) 1979-01-26 1981-08-04 Priam Enclosed disc drive with improved air flow
EP0015739B1 (en) 1979-03-09 1983-04-27 Skf (U.K.) Limited Labyrinth seals
FR2453527A1 (en) 1979-04-02 1980-10-31 Computer Peripherie Tech Motor mechanism comprising a motor induced dish
US4249221A (en) 1979-04-23 1981-02-03 Sli Industries, Inc. Method and apparatus for preventing contamination of a rotating magnetic disc
US4252353A (en) 1979-04-26 1981-02-24 Ferrofluidics Corporation Self-activating ferrofluid seals
US4398134A (en) 1979-05-15 1983-08-09 Papst-Motoren Kg Two-pulse permanent magnet brushless D-C motor
US4366516A (en) 1979-05-29 1982-12-28 Hitachi, Ltd. Precision machinery component
US4268878A (en) 1979-06-01 1981-05-19 New World Computer Company, Inc. Gas circulation and filtration apparatus for magnetic disc recording systems
US4280155A (en) 1979-06-04 1981-07-21 Memorex Mini Disc Drive Corp. Method of improving air flow in compact disc drive
US4285016A (en) 1979-06-04 1981-08-18 Microcomputer Systems Corp. Disc, tape and hybrid disc-tape memory apparatus and drive assembly
US4363057A (en) 1979-07-16 1982-12-07 International Business Machines Corporation Recirculating filter duct design
US4356437A (en) 1979-07-20 1982-10-26 Hitachi, Ltd. Control circuit for DC motors
US4329604A (en) 1979-08-06 1982-05-11 Micropolis Corporation Low loss brushless DC motor
US4317146A (en) 1979-12-03 1982-02-23 Micropolis Corporation Compact magnetic disk storage system
US4275339A (en) 1979-12-21 1981-06-23 International Business Machines Corporation Bifilar brushless DC motor
US4365916A (en) 1980-02-26 1982-12-28 Miyakawa Industry Co., Ltd. Turning type multi-spindle attachment
DE3049334C3 (en) 1980-03-05 1993-09-30 Papst Motoren Gmbh & Co Kg Drive device for disk space
GB2075240B (en) 1980-03-05 1985-03-13 Papst Motoren Kg Disc storage drive
US5424887A (en) 1980-03-05 1995-06-13 Papst Licensing Gmbh Disk storage drive
US5708539A (en) 1980-03-05 1998-01-13 Papst Licensing Gmbh & Co. Kg Disk storage drive
US5729403A (en) 1980-03-05 1998-03-17 Papst Licensing Gmbh Disk storage drive
US5946161A (en) 1980-03-05 1999-08-31 Papst Licensing Gmbh Disk storage device having a labyrinth seal
US5777822A (en) 1980-03-05 1998-07-07 Papst Licensing Gmbh Disk storage drive
US4438542A (en) 1980-03-05 1985-03-27 Papst-Motoren Gmbh & Co. Kg Disk storage drive
DE3135385A1 (en) 1980-03-05 1983-03-17 Papst Motoren Gmbh & Co Kg Disc storage unit
GB2072924B (en) 1980-03-27 1984-05-23 Sony Corp Optical discs and disc drive mechanisms employing magnetic drive coupling
US4554473A (en) 1980-05-10 1985-11-19 Papst-Motoren Gmbh & Co. Kg Brushless direct current motor system
US5801900A (en) 1980-05-10 1998-09-01 Papst Licensing Gmbh Disk storage device, with hub and drive motor rotor features
US4329722A (en) 1980-05-15 1982-05-11 Priam Corporation Enclosed disc drive having combination filter assembly
US4365187A (en) 1980-05-15 1982-12-21 Rotron Incorporated Brushless D.C. motor
US4363046A (en) 1980-05-24 1982-12-07 Sony Corporation Deflectable transducer head assembly
DE3122049C2 (en) 1980-06-06 1992-12-10 Papst-Motoren Gmbh & Co Kg, 7742 St Georgen, De
US5661351A (en) 1980-06-06 1997-08-26 Papst Licensing, Gmbh Disc drive having a brushless DC drive motor with an external rotor for supporting one or more storage discs
US5382853A (en) 1980-06-06 1995-01-17 Papst Licencing Gmbh Brushless DC drive motor with external rotor for use in disc drives and like devices
US4396964A (en) 1980-07-02 1983-08-02 Storage Technology Corporation Recirculating air system for magnetic disk drive
US4430603A (en) 1980-07-18 1984-02-07 Mueller Rolf Brushless direct current motor having a once-around pulse generating means
US4396959A (en) 1980-09-24 1983-08-02 Quantum Corporation Data transducer position control system for rotating disk data storage equipment
USRE32075E (en) 1980-09-24 1986-01-28 Quantum Corporation Data transducer position control system for rotating disk data storage equipment
US4497138A (en) 1980-11-05 1985-02-05 Buderus Aktiengesellschaft Apparatus for simultaneously grinding inner and outer workpiece surfaces
US4445159A (en) 1980-11-29 1984-04-24 Hitachi, Ltd. Chassis for video tape recorder
US4519010A (en) 1980-12-05 1985-05-21 Papst-Motoren Gmbh & Co. Kg Driving mechanism for magnetic hard disc memories
DE3144629A1 (en) 1980-12-05 1982-07-08 Papst Motoren Gmbh & Co Kg Drive means for magnetic disk storage
GB2092834A (en) 1980-12-05 1982-08-18 Papst Motoren Gmbh & Co Kg Driving Mechanism for Magnetic Disc Drive Unit
US4922406A (en) 1980-12-29 1990-05-01 Papst-Motoren Gmbh & Co. Kg Labyrinth seal in disk storage drive
US4535373A (en) 1980-12-29 1985-08-13 Papst-Motoren Gmbh & Co. Kg Labyrinth seal in disk storage drive
EP0069545A3 (en) 1981-07-02 1983-04-27 Irwin International, Inc. Disc recorder with integral cartridge tape module
US4779165A (en) 1981-09-07 1988-10-18 Papst-Motoren Gmbh & Co. Kg Disk storage drive
US5128819A (en) 1981-09-07 1992-07-07 Papst-Motoren Gmbh & Co. Kg Disk storage drive with radially extending motor shield
US5446610A (en) 1981-09-07 1995-08-29 Papst Licensing Gmbh Disk storage device having a brushless DC drive motor
USRE35792E (en) 1981-09-07 1998-05-12 Papst Licensing, Gmbh Disk storage drive
US5774302A (en) 1981-09-07 1998-06-30 Papst Licensing, Gmbh Spin drive motor for a disk storage device
US4658312A (en) 1981-09-07 1987-04-14 Papst-Motoren Gmbh & Co. K.G. Disk storage drive
USRE34412E (en) 1981-09-07 1993-10-19 Papst-Motoren Gmbh & Co. Kg Disk storage drive having motor drive with non-corrodible hub
US4843500A (en) 1981-09-07 1989-06-27 Papst-Motoren Gmbh & Co. Kg Disk storage drive
US5422769A (en) 1981-09-07 1995-06-06 Papst Licensing Gmbh Spin motor for rotating a storage disk in a disk drive
US5173814A (en) 1981-09-07 1992-12-22 Papst-Motoren Gmbh & Co. Kg Disk storage drive having internal electrical connection passages and contamination seals at ends of the motor
US5001581A (en) 1981-09-07 1991-03-19 Papst Motoren Gmbh & Co. Kg Disk storage drive
US5557487A (en) 1981-09-07 1996-09-17 Papst Licensing Gmbh Disk storage drive having particular diameter relationship and axial compactness
US5216557A (en) 1981-09-07 1993-06-01 Papst-Motoren Gmbh & Co. Kg Disk storage device having a brushless dc drive motor
US5040085A (en) 1981-09-07 1991-08-13 Papst-Motoren Gmbh & Co. Kg Disk storage drive directed to disk drive details
US5006943A (en) 1981-09-07 1991-04-09 Papst-Motoren Gmbh & Co., Kg Disk storage drive
US4725904A (en) 1981-10-05 1988-02-16 Tandon Corporation Magnetic disk memory apparatus with improved contamination control
US4562496A (en) 1982-02-25 1985-12-31 Matsushita Electric Industrial Co., Ltd. Magnetic tape recording and/or reproducing apparatus
US4599664A (en) * 1982-03-01 1986-07-08 Papst-Motoren Gmbh & Co Kg Disk storage drive
DE3314079C2 (en) 1982-04-19 1993-03-11 Papst-Motoren Gmbh & Co Kg, 7742 St Georgen, De
US4471395A (en) 1982-05-17 1984-09-11 International Business Machines Corporation Self-ventilated recirculating airflow system
EP0094484A1 (en) 1982-05-17 1983-11-23 International Business Machines Corporation Self-ventilated recirculating airflow system
US4553183A (en) 1982-06-28 1985-11-12 Atasi Corporation Memory storage apparatus having improved housing and base plate arrangement
US4701653A (en) 1982-07-27 1987-10-20 Papst-Motoren Gmbh & Co Kg Disk drive with internal brake and static discharge
EP0107380A3 (en) 1982-09-27 1985-05-22 Quantum Corporation A data storage device and a method of data storage
US4516177A (en) 1982-09-27 1985-05-07 Quantum Corporation Rotating rigid disk data storage device
US4656545A (en) 1983-07-28 1987-04-07 Nippon Seiko Kabushiki Kaisha Magnetic disc memory device
US4780777A (en) 1984-02-07 1988-10-25 Siemens Aktiengesellschaft Hermetically sealed, two-sided bearing structure for a magnetic disk memory
US4739425A (en) 1984-02-07 1988-04-19 Siemens Aktiengesellschaft Magnetic disk memory comprising a membrane spring-braced bearing of a disk pack which is rotatably mounted at both ends
EP0151260A1 (en) 1984-02-07 1985-08-14 Siemens Aktiengesellschaft Magnetic disc memory comprising a stack of discs with double sided bearing within a partially resilient casing
US4672487A (en) 1984-02-07 1987-06-09 Siemens Aktiengesellschaft Magnetic disk memory having a disk pack hub seated at both sides of a disk pack
EP0151258A1 (en) 1984-02-07 1985-08-14 Siemens Aktiengesellschaft Divided housing with peripheral ring seal for magnetic disc memory
EP0151259B1 (en) 1984-02-07 1988-11-09 Siemens Aktiengesellschaft Magnetic disc memory with two-sided bearing for a stack of disc biased by a membrane spring
US4692827A (en) 1984-02-07 1987-09-08 Siemens Aktiengesellschaft Divided housing for a magnetic disk drive comprising a peripheral sealing ring
US4616538A (en) 1984-04-27 1986-10-14 Uma Corporation Chuck assembly
US4607182A (en) 1984-05-26 1986-08-19 Georg Muller Nurnberg Gmbh Motor spindle with integrated bearing races
EP0172459B1 (en) 1984-07-31 1990-02-14 Hitachi, Ltd. Spindle assembly for magnetic disks
US4754351A (en) 1984-08-22 1988-06-28 Maxtor Corporation Method and apparatus for controlling radial disk displacement in Winchester disk drives
GB2166586A (en) 1984-10-29 1986-05-08 Priam Corp Grounding arrangement for head disk assembly
DE3538480A1 (en) 1984-10-29 1986-04-30 Priam Corp Grounded main memory plate arrangement
US4672250A (en) 1984-11-15 1987-06-09 A. O. Smith Corporation Drive motor bearing apparatus
USRE36016E (en) 1984-11-29 1998-12-29 Papst Licensing, Gmbh Disc storage device having an integrated driving system
US4991211A (en) 1984-11-29 1991-02-05 Papst-Motoren Gmbh & Co. Kg Integrated driving system for signal-processing devices
US4743995A (en) 1985-10-31 1988-05-10 International Business Machines Corporation Disk file with in-hub motor
US4717977A (en) 1986-09-25 1988-01-05 Micropolis Corporation High capacity Winchester disk drive
GB2195812B (en) 1986-09-25 1990-08-01 Micropolis Corp High capacity winchester disk drive
EP0263932B1 (en) 1986-10-14 1992-07-15 International Business Machines Corporation Disk file including a filtration system
US4739203A (en) 1986-10-24 1988-04-19 Shicoh Engineering Co. Ltd. Single-phase brushless motor with cogging features
US4805055A (en) 1986-11-24 1989-02-14 Maxtor Winchester disc drive actuator structure
US4739427A (en) 1987-01-14 1988-04-19 Micropolis Corporation High capacity hard disk construction
US4814652A (en) 1987-02-27 1989-03-21 Maxtor Corporation Disk drive motor with thermally matched parts
US4928029A (en) 1987-02-27 1990-05-22 Maxtor Corporation In-spindle motor assembly for disk drive and method for fabricating
US4829657A (en) 1987-02-27 1989-05-16 Maxtor Corporation In-spindle motor assembly for disk drive and method for fabricating the same
US4797762A (en) 1987-09-22 1989-01-10 Micropolis Corporation Stress free winchester drive shaft mounting
US4905110A (en) * 1988-03-25 1990-02-27 Magnetic Peripherals Inc. Disk drive spindle motor
US4949000A (en) 1988-07-18 1990-08-14 Mueller And Smith, Lpa D.C. motor
US5251081A (en) 1991-05-31 1993-10-05 International Business Machines Corporation Spindle grounding device
JP6134771B2 (en) 1997-09-23 2017-05-24 ザ デパートメント オブ ベテランズ アフェアズ Composition for maintaining the organ, the method and apparatus
JP4886510B2 (en) 2003-07-21 2012-02-29 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングRobert Bosch Gmbh Method and apparatus for determining the position and / or the intended position of the relative vehicle relative to the roadway of the opposite traffic lane of multi-lane during the parking process
JP5090905B2 (en) 2004-05-19 2012-12-05 クラリアント ファイナンス (ビーブイアイ) リミティド Bridged monoazo dye
JP5339727B2 (en) 2004-12-31 2013-11-13 サン−ゴバン グラス フランス The method for bending a glass sheet by suction
JP4887809B2 (en) 2006-01-31 2012-02-29 沖電気工業株式会社 The paper sheet stacking apparatus
JP5357010B2 (en) 2006-04-24 2013-12-04 コーニンクレッカ フィリップス エヌ ヴェ Coil system and a magnetic resonance system
JP5184516B2 (en) 2006-05-16 2013-04-17 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Simplified biphasic defibrillator circuit has a make-only switching
JP4985110B2 (en) 2007-06-01 2012-07-25 住友電気工業株式会社 Vehicle driving support system, a driving support device, a vehicle and a vehicle driving support method
JP5133410B2 (en) 2007-07-20 2013-01-30 カーディアック ペースメイカーズ, インコーポレイテッド Devices and methods for respiratory therapy
JP5458011B2 (en) 2007-08-03 2014-04-02 ビオ−ラド・イノベーションズ Antibodies to the new BNP (1-32) epitope and the epitope
JP4946716B2 (en) 2007-08-10 2012-06-06 日産自動車株式会社 Under cover support structure
JP4971909B2 (en) 2007-08-24 2012-07-11 キヤノン株式会社 Game program, as well as computer equipment and its control method
JP5543360B2 (en) 2007-12-06 2014-07-09 コーニンクレッカ フィリップス エヌ ヴェ Apparatus for applying energy to an object, method and computer program
JP5525725B2 (en) 2007-12-17 2014-06-18 ランクセス・インコーポレーテッド Diene - Hydrogenation of the base polymer latex
JP5355106B2 (en) 2008-01-29 2013-11-27 ネステク ソシエテ アノニム System and a control method for such a system to vary the fluid temperature
JP5376809B2 (en) 2008-02-13 2013-12-25 エヌ・ティ・ティ・コミュニケーションズ株式会社 The wireless terminal device, the method and program
JP5126669B2 (en) 2008-02-15 2013-01-23 株式会社ニコン Infrared zoom lens
JP5242209B2 (en) 2008-03-24 2013-07-24 古河電気工業株式会社 The method of manufacturing an optical fiber
JP5157011B2 (en) 2008-04-28 2013-03-06 株式会社小松製作所 Surge voltage suppression circuit of the switching device
JP5922273B2 (en) 2008-11-18 2016-05-24 住友化学株式会社 Photosensitive resin composition
JP4934714B2 (en) 2008-12-18 2012-05-16 キヤノン株式会社 The information processing apparatus and a control method and program
JP5250704B2 (en) 2009-03-13 2013-07-31 ローゼンベルガー ホーフフレクベンツテクニーク ゲーエムベーハー ウント ツェーオー カーゲー Sealing of the contact pins which are spring-biased
JP5441619B2 (en) 2009-10-30 2014-03-12 ソニーモバイルコミュニケーションズ, エービー Short-range wireless communication device, short-range wireless communication system, a control method for near field communication device, the control program of the near field communication device, and the mobile phone terminal
JP5351719B2 (en) 2009-11-25 2013-11-27 パナソニック株式会社 Automotive lighting device
JP5323010B2 (en) 2010-07-05 2013-10-23 レノボ・シンガポール・プライベート・リミテッド The information input apparatus, the screen arrangement methods, and computer-executable program
JP5355509B2 (en) 2010-07-06 2013-11-27 株式会社 ナミ潜水社 Water stop apparatus of the water tank
JP5370309B2 (en) 2010-07-30 2013-12-18 三菱電機株式会社 Hand-drying apparatus
JP5162002B2 (en) 2011-05-20 2013-03-13 藤倉ゴム工業株式会社 Method for producing a cable sealing member
JP5830965B2 (en) 2011-06-28 2015-12-09 日産自動車株式会社 Braking force control device
JP5822571B2 (en) 2011-07-07 2015-11-24 キヤノン株式会社 Sheet feeding apparatus and an image forming apparatus
JP5830312B2 (en) 2011-09-05 2015-12-09 染矢電線株式会社 Wire with terminals
JP6120871B2 (en) 2011-12-15 2017-04-26 ビーエーエスエフ ソシエタス・ヨーロピアBasf Se Adverse prepared from biological agents and polyalkoxylates of the melt, solid pesticidal formulation which may comprise polycarboxylate complexed with liquid adjuvant killing
JP5753876B2 (en) 2013-07-03 2015-07-22 京楽産業.株式会社 Game machine

Non-Patent Citations (19)

* Cited by examiner, † Cited by third party
Title
"American Metal Market, V. 92 (p. 10), Jan. 30, 1984: Composites Used Extensively In Buick Tin-Plating Systems".
"Machine Tools, New Edition", Ito et al., Published 1970.
"Motor in spindle gives micro-Winchester room for 140M bytes", J. Swartz, Mini-Micro Systems, Feb. 1983. pp. 143-144, 147-148.
"Who Need High Capacites?", M. Pearce, Computer Systems, Nov. 1983, pp. 81-84.
An Overview of the Sperry Flight Management Computer system for the Boeing 757/767 Airplanes (1979).
Brushless DC Drive Spindle "Sextant", Rotron Inc., Woodstock, N.Y., Nov. 17, 1980.
Drawing "GAE Motor" (1 sheet) Papst Motoren GmbH & Co. KG.
Drawing "Motor 9333 5310 001" (2 sheets) Papst Motoren GmbH & Co. KG.
Fixed-Head Disk Memory Unit for High Reliability Applications, Isozaki et al. NEC Research & Development, No. 44 Jan. 1977 at pp. 57-67.
German article entitled: "Diskettenanantrieb im Mini-Floppy-Laufwerk," taken from VDI-Berichte Nr. 482 Von Ing. (Grad.) K. Schramm, Nurnberg., pp. 56-59 (1983).
German article entitled: "Diskettenanantrieb im Mini-Floppy-Laufwerk," taken from VDI—Berichte Nr. 482 Von Ing. (Grad.) K. Schramm, Nurnberg., pp. 56-59 (1983).
German brochure entitled: "P.M. Computerheft-Computer Entdecken Und Vertehen", pp. 49-51 (Feb. 1984).
German brochure entitled: "P.M. Computerheft—Computer Entdecken Und Vertehen", pp. 49-51 (Feb. 1984).
Hardware Maintenance Manual for Control Data Fixed Disk Drive Model 9414.
Kobayashi et al., "Direct Drive System For Isolated Loop Drive." National Technical Report, vol. 22, No. 4, Aug. 1976.
Machinery and Production Engineering, V. 116, N. 3003 (pp. 861-862), 1970 "Universal Power Chucks Facilitate Small Batch Production".
Plastic Ridge Seal to Trap Airborne Submicron Particles, V.J. Trotter, Jr. IBM Technical Disclosure Bulletin, vol. 19, No. 4 Sep. 1976.
Production, V. 93, No. 5, May 1984 "Spotlight On Machining Centers".
Zweipulsige Kollectoriose Gleichstrom Motoren (No Month) 1977; Papst Motoren KG., Germany.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040189105A1 (en) * 2003-03-25 2004-09-30 Twinbird Corporation Fixation framework for ring-shaped permanent magnet
US7122919B2 (en) * 2003-03-25 2006-10-17 Twinbird Corporation Fixation framework for ring-shaped permanent magnet
US20080211325A1 (en) * 2003-12-05 2008-09-04 Valeo Systemes D'essuyage Electromotive Drive
US7684146B1 (en) * 2005-11-22 2010-03-23 Maxtor Corporation Hermetic seal for a spindle motor of a disk drive
US20100109465A1 (en) * 2008-10-30 2010-05-06 System General Corporation Motor structure and fan
US20150171713A1 (en) * 2012-05-25 2015-06-18 Robert Bosch Gmbh Electronically commutated dc motor with shielding
US9673686B2 (en) * 2012-05-25 2017-06-06 Robert Bosch Gmbh Electronically commutated DC motor with shielding

Similar Documents

Publication Publication Date Title
US6133655A (en) Claw-pole stepping motor with rotor including vibration reducing magnet
US4985792A (en) Disk drive spindle motor with externally mounted flux concentrator ring
US5962938A (en) Motor with external rotor
US4734606A (en) Electric motor with ferrofluid bearing
US5637945A (en) Brushless motor
US5352947A (en) Spindle motor assembly for disc drives
US4394594A (en) Motor with a disk rotor
US4875110A (en) Rotary head apparatus with motor magnet and yoke surrounding motor stator coil
US5633545A (en) Disk drive in-hub radial-gap spindle motor with coils generating axial fields
US4125792A (en) Brushless D-C motor
US4851731A (en) Structure of a flat-type brushless DC motor
US6198189B1 (en) Motor-driven device having improved water-proofness
US5124863A (en) Disk drive device having reduced thickness
US4755709A (en) Electric machine having magnetic bearing means
US4824122A (en) Compact magnetic fluid low pressure seal
US5045738A (en) Spindle motor
US4259604A (en) DC rotary machine
US4949000A (en) D.C. motor
US5668427A (en) Spindle motor having recessed stator coils
US5124602A (en) DC motor unit with a rotational speed detector
US4459501A (en) Toroidal generator and motor with radially extended magnetic poles
US5604390A (en) Permanent magnet motor with radically magnetized isotropic permanent magnet cylindrical yoke
US4642496A (en) Device for detecting the angular position of the rotor of a rotary electric machine with electronic switching
US6104114A (en) Brushless motor
US5894746A (en) Drive device for a front-loading washing machine