Claims
- 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, 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 brushless DC motor including a stator concentric with said axis, a stator winding disposed on said stator, a shaft aligned on said axis, at least one bearing affixed to said shaft, and a rotor that is 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 DC motor further including a hub member having a generally cylindrical portion that extends through the central opening of said at least one disk to mount said at least one disk for rotation about said axis in said clean chamber; wherein said brushless DC motor is mounted in said clean chamber so that at least a portion of said hub member is contiguous with at least a portion of said rotor and so that the space of said clean chamber that is occupied by said at least one hard magnetic storage disk is axially separated from the space of said clean chamber that is occupied by said permanent magnetic ring in a direction along said axis; wherein said brushless DC motor further includes a bearing tube having an inner cylindrical surface to which an outer race of said at least one bearing is affixed, a labyrinth seal being defined between an outer cylindrical surface of said bearing tube and a cylindrical surface of said motor that coaxially surrounds at least a portion of said bearing tube, said labyrinth seal reducing at least some of the transfer of contaminants from said at least one bearing into said clean chamber; and a filter positioned within said clean chamber, said clean chamber being formed to direct an airflow that is created during operation of said disk storage device through said filter to entrap at least some of the contaminants that are released from said motor into said clean chamber.
- 22. The disk storage device of claim 21 wherein the outside diameter of the generally cylindrical portion of said hub member is smaller than at least one of the distances specified in a group consisting of: the inner diameter of said permanent magnetic ring, the outer diameter of said permanent magnetic ring, the inner diameter of said magnetically conductive member, and the outer diameter of said magnetically conductive member.
- 23. 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.
- 24. The disk storage device of claim 21 wherein said shaft is rotatable about said axis.
- 25. The disk storage device of claim 21 wherein said permanent magnetic ring is formed from a generally radially oriented permanent magnetic material.
- 26. The disk storage device of claim 25 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.
- 27. The disk storage device of claim 26 wherein said permanent magnetic material comprises a mixture of ferrite and an elastic material.
- 28. The disk storage device of claim 21 said hub member comprises a generally non-magnetically conductive material.
- 29. The disk storage device of claim 28 wherein said generally non-magnetically conductive material comprises a light metal.
- 30. The disk storage device of claim 29 wherein said light metal comprises aluminum.
- 31. The disk storage device of claim 21 wherein said rotor comprises an external rotor.
- 32. The disk storage device of claim 21 wherein said permanent magnetic ring coaxially surrounds the portion of said stator that forms said generally cylindrical air gap.
- 33. The disk storage device of claim 21 wherein said bearing tube is mounted stationary with respect to said housing and said stator.
- 34. The disk storage device of claim 21 wherein said cylindrical surface of said motor is formed in a portion of said rotor.
- 35. The disk storage device of claim 21 wherein said labyrinth seal includes first and second portions that define first and second axes, said first axis being disposed at an angle with respect to said second axis.
- 36. The disk storage device of claim 35 wherein said first longitudinal axis is disposed at a 90° angle with respect to said second longitudinal axis.
- 37. 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 brushless DC motor including a stator concentric with said axis, a stator winding disposed on said stator, a shaft aligned on said axis, at least one bearing affixed to said shaft, and a rotor that is 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 DC motor further including a hub member having a generally cylindrical portion that extends through the central opening of said at least one disk to mount said at least one disk for rotation about said axis in said clean chamber; wherein said brushless DC motor is mounted in said clean chamber so that at least a portion of said hub member is contiguous with at least a portion of said rotor and so that the outside diameter of the generally cylindrical portion of said hub member is smaller than at least one of the distances specified in a group consisting of: the outer diameter of said permanent magnetic ring, the inner diameter of said magnetically conductive member, and the outer diameter of said magnetically conductive member; and wherein said brushless DC motor further includes a bearing tube having an inner cylindrical surface to which an outer race of said at least one bearing is affixed, a labyrinth seal being defined between an outer cylindrical surface of said bearing tube and a cylindrical surface of said motor that coaxially surrounds at least a portion of said bearing tube, said labyrinth seal reducing at least some of the transfer of contaminants from said at least one bearing into said clean chamber; and a filter positioned within said clean chamber, said clean chamber being formed to direct an airflow that is created during operation of said disk storage device through said filter to entrap at least some of the contaminants that are released from said motor into said clean chamber.
- 38. The disk storage device of claim 37 wherein said magnetically conductive member provides at least a portion of a magnetic return path for said permanent magnetic ring.
- 39. The disk storage device of claim 37 wherein said shaft is rotatable about said axis.
- 40. The disk storage device of claim 37 wherein said permanent magnetic ring is formed from a generally radially oriented permanent magnetic material.
- 41. The disk storage device of claim 40 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.
- 42. The disk storage device of claim 41 wherein said permanent magnetic material comprises a mixture of ferrite and an elastic material.
- 43. The disk storage device of claim 37 said hub member comprises a generally non-magnetically conductive material.
- 44. The disk storage device of claim 43 wherein said generally non-magnetically conductive material comprises a light metal.
- 45. The disk storage device of claim 44 wherein said light metal comprises aluminum.
- 46. The disk storage device of claim 37 wherein said rotor comprises an external rotor.
- 47. The disk storage device of claim 37 wherein said permanent magnetic ring coaxially surrounds the portion of said stator that forms said generally cylindrical air gap.
- 48. The disk storage device of claim 37 wherein said bearing tube is mounted stationary with respect to said housing and said stator.
- 49. The disk storage device of claim 37 wherein said cylindrical surface of said motor is formed in a portion of said rotor.
- 50. The disk storage device of claim 37 wherein said labyrinth seal includes first and second portions that define first and second axes, said first axis being disposed at an angle with respect to said second axis.
- 51. The disk storage device of claim 50 wherein said first longitudinal axis is disposed at a 90° angle with respect to said second longitudinal axis.
Priority Claims (5)
Number |
Date |
Country |
Kind |
3658/80 |
May 1980 |
CH |
|
3045972 |
Dec 1980 |
DE |
|
3135385 |
Sep 1981 |
DE |
|
2680/84 |
Jun 1984 |
CH |
|
1374/85 |
Mar 1985 |
CH |
|
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 Failure,” (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), now U.S. Pat. No. Re. 38,178, 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.
This is a continuation of application Ser. No. 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. 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. 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. 326,559, filed Dec. 2, 1981, now U.S. Pat. No. 4,519,010, issued May 21, 1985, said application Ser. No. 412,093 also being a continuation-in-part of application Ser. No. 244,971, filed Mar. 18, 1981, now abandoned, said application Ser. No. 201,736 also being a continuation-in-part of application Ser. No. 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. 733,231, filed May 10, 1985, now abandoned, which is a continuation-in-part of the said application Ser. No. 412,093.
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Divisions (1)
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