EP0509635A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Disk drive unit
Assignee: Hitachi Ltd
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Filing: 1992-03-11
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Granted: —
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Expires: 2012-03-11
Abstract
Abstract A motor has a stator (4) and a rotor (3), the stator (4) having cores (9A) and drive coils (1) which generate magnetic fields for rotating the rotor (3). The stator (4) also has a yoke (9B,9C) surrounding the rotor (3) and the rotor (3) is positioned such that it is closer to one part (9B) of the outer periphery of the yoke than another part (9B) of the yoke. Such a motor is particularly suitable for use in a disk drive unit as a spindle motor (2) for rotating the disk (1). Then an actuator (12) for moving a head (11) may be located adjacent the part (9B) of the outer periphery of the yoke (9b,9C) which is closest to the rotor. This permits the head (11) to approach closely the axis of rotation of the disk (1) without the spindle motor (2) interfering with the movement of the head (11). The continuous yoke (9B,9C) prevents magnetic flux leakage from the spindle motor interfering with the actuator (12). The actuator (12) may itself have a yoke (9D) integral with the yoke (9B,9C) of the spindle motor (2), and/or other components in common.
Inventors
- 👤 Fumio Tajima
- 👤 Hiroshi Kanazawa
- 👤 Hiroshi Katayama
- 👤 Kazuo Ohnishi
- 👤 Tadashi Takashashi
- 👤 Nobuyoshi Mutoh
- 👤 Shigeki Morinaga
- 👤 Nobuyoshi Tsuboi
- 👤 Hideki Nihei
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 14:56
CPC Classifications
G; G11; G11B; G11B25/00; G11B25/04; G11B25/043; G11B15/00; G11B19/00; G11B19/20; H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/146; H02K16/00; H02K21/00; H02K21/12; H02K21/14; H02K21/16; H02K7/00; H02K7/14; H02K2201/00; H02K2201/15; H02K41/00; H02K41/02; H02K41/03
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
91 words
A motor comprising a stator (4) and a rotor (3) rotatable about a rotation axis, wherein the stator (4) has means (9A,10) for generating magnetic fields for rotating said rotor (3) about said rotation axis and a yoke (9B,9C) extending continuously around the rotor (3): characterised in that: the rotor (3) is located within the stator (4) such that the rotation axis is closer to a first part (9C) of the outer periphery of the yoke (9B,9C) than to a second part (9B) of the outer periphery of the yoke (9B,9C).
Claim 2
Dependent Claim
17 words
A motor according to claim 1, wherein the rotor (3) includes at least one permanent magnet (5).
Claim 3
Dependent Claim
35 words
A motor according to claim 1 or claim 2, wherein said means (9A,10) for generating magnetic fields comprises a plurality of cores (9A) and a plurality of field coils (10) associated with said cores (9A).
Claim 4
Dependent Claim
28 words
A motor according to claim 3, wherein said cores (9A) extend from said yoke (9B,9C) and have free ends spaced by a predetermined distance from said rotor (3).
Claim 5
Dependent Claim
37 words
A motor according to claim 4, wherein the inner periphery of said yoke (9B,9C) between said rotation axis and said first part (9C) of said outer periphery is spaced from said rotor (3) by said predetermined distance.
Claim 6
Dependent Claim
38 words
A motor according to any one of the preceding claims, wherein said inner periphery of said yoke (9B,9C) between said rotation axis and said first part (9C) of said outer periphery has a plurality of grooves (18a,18b) therein.
Claim 7
Dependent Claim
65 words
A motor according to any one of the preceding claims wherein said outer periphery of said yoke has a curved part (9B) and a straight part (9C) interconnecting the ends of said curved part (9B), such that said curved part (9B) and said straight part (9C) form a major sector of a circle with said rotation axis being coincident with the center of said circle.
Claim 8
Dependent Claim
38 words
A motor according to any one of claims 1 to 6 wherein said outer periphery of said yoke (9B,9C) is in the form of an ellipse and said rotation axis is displaced from the foci of said ellipse.
Claim 9
Dependent Claim
36 words
A motor according to any one of claims 1 to 6 wherein said outer periphery corresponds substantially to a major segment of a circle and said rotation axis is coincident with the center of said circle.
Claim 10
Dependent Claim
35 words
A disk drive unit having a rotatable support (21) for a disk (1) and a motor (2) according to any one of the preceding claims for rotating said rotatable support (21) about a rotation axis.
Claim 11
Dependent Claim
55 words
A disk drive unit according to claim 10, also having a head (11) for interacting with said disk drive (1) and an actuator (12) for moving said head relative to said rotation axis, said actuator (12) being located beyond said outer periphery of said yoke (9B,9C) adjacent said first part (9C) of said outer periphery.
Claim 12
Dependent Claim
95 words
A disk drive according to claim 10 or claim 11 also including a head (11) for interacting with said disk (1), and an actuator (12) for moving said head (11) relative to said rotation axis, said actuator (12) comprising a movable part (19) and a fixed part (18), said fixed part (18) having a further means (23,24) for generating magnetic fields for driving said movable part (19) and a further yoke (9D0 supporting said second means; wherein said yoke (9B,9C) of said motor (2) and said further yoke (9D) of said actuator (12) are integral.
Claim 13
Dependent Claim
125 words
A disk drive unit according to any one of claims 10 to 12 also including a head (11) for interacting with said disk (1) and an actuator (12) for moving said head (11) relative to said rotation axis, said actuator (12) comprising a movable part (19) and a fixed part (18), said movable part (20) being drivable by magnetic fields generated by said fixed part (18); wherein said stator (4) of said motor (2) has at least one first drive coil (10) and said fixed part (18) of said actuator (10) has at least one second drive coil (23) and said at least one first drive coil (10) and said at least one second drive coil (23) are both on a common insulating substrate (23).
Claim 14
Dependent Claim
91 words
A disk drive unit according to any one of claims 10 to 12 also including a head (11) for interacting with said disk (1) and an actuator (12) for moving said head (11) relative to said rotation axis, said actuator (12) comprising a movable part and a fixed part (18) said movable part (19) being drivable by magnetic fields generated by said fixed part; wherein said stator (4) of said motor (2) and said fixed part (18) of said actuator (21) each include piezoelectric parts interconnected by integral piezoelectric material (32).
Claim 15
Dependent Claim
47 words
A disk drive unit according to any one of claims 10 to 14 wherein said actuator (12) is arranged to move said head (11) along a predetermined locus, and an extension of said locus intersects sid first part (9C) of said outer periphery of said yoke (9B,9C).
Claim 16
Dependent Claim
71 words
A disk drive unit according to any one of claims 10 to 15 wherein: said rotor comprises at least one permanent magnet (5): and said disk has a region of magnetic material (1b) being direct magnetic interaction between said at least one permanent magnet (5) and said region (1b) of said disk, whereby said direct magnetic interaction provides a holding force for holding said disk (11) on said rotatable support (21).
Claim 17
Dependent Claim
42 words
A disk drive unit according to any one of claims 10 to 16 wherein said disk is a magnetic disk (1), and there is a magnetic shielding member (23) between said motor (2) and at least a part of said disk (1).
Claim 18
Dependent Claim
132 words
A disk drive unit having a rotatable support (21) for a disk (1) and a motor (2) for rotating said rotatable support (21) about a rotation axis; said motor (2) having a stator (4) and a rotor (3) rotatable about said rotation axis, said rotor (3) comprising at least one permanent magnet (5) and being drivable for rotation about said rotation axis by the interaction of magnetic fields generated by said stator (4) with at least one permanent magnet (5); said disk having a region of magnetic material (1b); characterised in that; there is direct magnetic interaction between said at least one permanent magnet (5) and said region (1b) of said disk (1), whereby said direct magnetic interaction provides a holding force for holding said disk (1) on said rotatable support (21).
Claim 19
Dependent Claim
50 words
A disk drive according to claim 18, wherein said stator (4) has at least one yoke (9B,9C) around said rotor (3) and said at lest one permanent magnet (5) has a height in the direction of said rotation axis greater than the height of the yoke (9B,9C) in said direction.
Claim 20
Dependent Claim
27 words
A disk drive unit according to claim 18, or claim 19 wherein said region (1b) of said disk (1) is proximate the center of said disk (1).
Claim 21
Dependent Claim
134 words
A disk drive unit having a rotatable support (21) for a disk (1) and a motor (2) for rotating said rotatable support (21) about a rotation axis, said motor (2) having a stator (4) and a rotor (3) rotatable about said rotation axis, said stator (4) having first means (9A,10) for generating magnetic fields for rotating said rotor (3) and a first yoke (9B,9C) supporting said first means; said disk drive unit also including a head (11) for interacting with said disk (1) and an actuator (12) for moving said head relative to said rotation axis, said actuator (12) comprising a movable part (19) and affixed part (18) said fixed part (18) having second means; characterised in that: said yoke of said motor (2) and said yoke (9D) of said actuator (12) are integral.
Claim 22
Dependent Claim
28 words
A disk drive unit according to claim 21, wherein said actuator (12) is a linear actuator arranged to cause said head (11) to move along a linear locus.
Claim 23
Dependent Claim
28 words
A disk drive unit according to claim 21, wherein said actuator (12) is a rotation actuator arranged to cause said head (11) to move along a curved locus.
Claim 24
Dependent Claim
89 words
A disk drive unit according to any one of claims 21 to 23 wherein said stator (4) of said motor (2) has at least one first drive coil (10) for generating said magnetic fields generated by said stator (4) and said fixed part (18) of said actuator (12) has at least one second drive coil (24) for generating said further magnetic fields generated by said fixed part and said at least one first drive coil (10) and said at least one second drive coil (24) are etched conductive tracks.
Claim 25
Dependent Claim
199 words
A disk drive unit having a rotatable support (21) for a disk (1) and a motor (2) for rotating said rotatable support (21) about a rotation axis; said motor (2) having a stator (4) and a rotor (3) rotatable about said rotation axis, the rotor (13) being drivable for rotation about said rotation axis by magnetic fields generated by said stator (4), said disk drive unit also including a head (11) for interacting with said disk (1) and an actuator (12) for moving said head (11) relative to said rotation axis, said actuator (12) comprising a movable part (19) and a fixed part (18) said movable part (19) being drivable by further magnetic fields generated by said fixed part (18); wherein said stator (4) of said motor (2) has at least one first drive coil (10) for generating said magnetic fields generated by said stator (4) and said fixed part (18) of said actuator (12) has at least one second drive coil (24) for generating said further magnetic fields generated by said fixed part; characterised in that: said at least one first drive coil (10) and said at least one second drive coil (24) on a common insulating substrate.
Claim 26
Dependent Claim
31 words
A disk drive unit according to claim 25 wherein said at least one first drive coil (10) and said at least one second drive coil (24) are electrically interconnected in common.
Claim 27
Dependent Claim
30 words
A disk drive unit according to claim 26, wherein said at least one first drive coil (10) and said at least one second drive coil (24) are etched conductive tracks.
Claim 28
Dependent Claim
199 words
A disk drive unit having a rotatable support (21) for a disk (1) and a motor (2) for rotating said rotatable support (21) about a rotation axis; said motor (2) having a stator (4) and a rotor (3) rotatable about said rotation axis, the rotor (13) being drivable for rotation about said rotation axis by magnetic fields generated by said stator (4), said disk drive unit also including a head (11) for interacting with said disk (1) and an actuator (12) for moving said head (11) relative to said rotation axis, said actuator (12) comprising a movable part (19) and a fixed part (18) said movable part (19) being drivable by further magnetic fields generated by said fixed part (18); wherein said stator (4) of said motor (2) has at least one first drive coil (10) for generating said magnetic fields generated by said stator (4) and said fixed part (18) of said actuator (12) has at least one second drive coil (24) for generating said further magnetic fields generated by said fixed part; characterised in that: said at least one first drive coil (10) and said at least one second drive coil (24) on a common insulating substrate.
Claim 29
Dependent Claim
146 words
A disk drive unit having a rotatable support (21) for a disk and a motor (2) for rotating said rotatable support (21) about a rotation axis; said motor (2) having a stator (4) and a rotor (3) rotatable about said rotation axis, the rotor (3) being drivable for rotation about said rotation axis by magnetic fields generated by said stator (4), said disk drive unit also including a head (11) for interacting with said disk (1) and an actuator (12) for moving said head relative to said rotation axis, said actuator (12) comprising a movable part (19) and a fixed part (18) said movable part (19) being drivable by magnetic fields generated by said fixed part (18); characterised in that: said stator (4) of said motor (2) and said fixed part (18) of said actuator (12) each include piezoelectric parts interconnected by integral piezoelectric material (32).
Claim 30
Independent Claim
102 words
A method of operating a disk unit, said disk unit having a rotatable support (12) for a disk (1), a motor (2) for rotating said rotatable support (21) a sensor (11) and control means (13) for controlling the rotation of said motor (2); characterised in that: positional information is recorded around the periphery of the disk; and the method comprises: sensing said positional information on said disk (1) using said sensor (11); transmitting a position signal from said sensor (11) to said control means (13); and controlling said motor (2) using said control means (13) on the basis of said position signal.
Claim 31
Dependent Claim
53 words
A method according to claim 30 wherein said disk unit has a further sensor (20) for detecting the rotation of said motor 92) means for generating a rotation signal representing the rotation of said motor (2); wherein said position information is recorded on said disk (1) on the basis of said rotation signal.
References Cited (Backward Citations)
No citation records indexed.
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