WO2004084382A1 - 情報記録再生装置用モータとこれを用いた情報記録再生装置 - Google Patents
情報記録再生装置用モータとこれを用いた情報記録再生装置 Download PDFInfo
- Publication number
- WO2004084382A1 WO2004084382A1 PCT/JP2004/003197 JP2004003197W WO2004084382A1 WO 2004084382 A1 WO2004084382 A1 WO 2004084382A1 JP 2004003197 W JP2004003197 W JP 2004003197W WO 2004084382 A1 WO2004084382 A1 WO 2004084382A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- information recording
- base member
- stator coil
- rotor hub
- motor
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/085—Structural association with bearings radially supporting the rotary shaft at only one end of the rotor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, 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
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
Definitions
- the present invention 'relates to a motor for an information recording / reproducing device including a stator coil attached to a base member, and a rotor having an annular permanent magnet opposed to the stator coil, and an information recording / reproducing device using the same.
- a hard disk device (hereinafter referred to as an HDD) mounted on a terminal device such as a stationary personal computer or a portable notebook computer includes an information recording medium formed in a disk shape at a predetermined rotation speed.
- An information recording / reproducing device motor driven at a high speed is provided (for example, see FIG. 1 on page 5-6 of Japanese Patent Application Laid-Open No. 2000-350408).
- the information recording / reproducing device motor includes a rotor hub to which a ring-shaped permanent magnet is fixed, a stator coil disposed to face the outer peripheral surface of the permanent magnet, and a fluid that rotatably supports the rotor hub with respect to the stator coil. And a dynamic pressure bearing portion.
- the stator coil is fixed to a surface of a substantially plate-shaped bracket, and a through-hole is formed in the center of the bracket in a thickness direction.
- the axial end of a substantially cylindrical shaft (shaft) constituting the fluid dynamic bearing portion is fitted into the through hole.
- the rotor hub has a hole for inserting the shaft, and when the shaft fixed to the bracket is inserted into this hole, the rotor hub and the outer peripheral surface of the shaft and the surface of the bracket are in contact with each other. A gap is formed between them.
- the fluid dynamic bearing is configured by filling these gaps with lubricating oil.
- the conventional information recording / reproducing motor has a structure in which the shaft is fitted into the through hole of the bracket, when the shaft is mounted on the bracket, the axial position of the shaft with respect to the bracket is reduced. There was a problem that it was difficult to accurately perform positioning. Since the axial position of the shaft relative to the bracket also affects the axial position of the permanent magnet fixed to the rotor hub, the center of the magnetic circuit of the stator coil in the axial direction (magnetic center) and the permanent magnet The center of the magnetic circuit (magnetic center) could be shifted from each other.
- the present invention has been made in view of the above-described circumstances, and has as its object to provide a motor for an information recording / reproducing apparatus that can suppress vibration of a mouthpiece and generation of a pure tone. Disclosure of the invention
- a motor for an information recording / reproducing device comprises a rotor member and a stator coil attached to a base member of the information recording / reproducing device, wherein the rotor portion rotatably supports a rotor hub and the rotor hub.
- a shaft body wherein the rotor hub includes a permanent magnet in which a plurality of magnetic poles are arranged in an annular shape facing the stator coil, and the fluid dynamic bearing portion is fixed to the rotor hub;
- a sleeve fixed to the base member, a first abutting surface that abuts the stator coil in the axial direction, and a second abutment surface that abuts the sleeve in the axial direction.
- the abutment surface is provided.
- the sleeve constitutes the rotor portion together with the shaft body and the rotor hub, before the sleeve is brought into contact with the first abutting surface, the sleeve is preliminarily put to sleep.
- the permanent magnet can be positioned relative to each other. Since the first and second abutment surfaces facing in the axial direction are formed on one base member, the relative positioning of the first and second abutment surfaces in the axial direction can be determined. It can be performed accurately and easily.
- the permanent magnet is formed in the circumferential direction. Variations in the operating magnetic force are suppressed, and vibration of the rotor hub can be suppressed. In this case, the generation of a pure tone based on the variation of the magnetic center between the stator coil and the permanent magnet can be suppressed.
- a first fitting surface for fitting the peripheral surface of the stator coil to the base member, and a second mating surface for fitting the peripheral surface of the slip to the base member is characterized by being provided.
- the first fitting surface and the second fitting surface formed around the axis are formed on one base member.
- the relative positioning between the mating surface and the second mating surface can be performed accurately and easily.
- the relative positioning between the sleeve and the permanent magnet can be performed in advance before the peripheral surface of the sleeve is fitted to the second fitting surface.
- the base member is made of iron.
- the information recording / reproducing apparatus comprises: a motor for the information recording / reproducing apparatus; a thin plate-shaped information recording medium fixed to the rotor hub; and information recorded on the information recording medium.
- An HSA having an information conversion element for reproducing information recorded on a recording medium and a rocking means for positioning the information conversion element at a predetermined position, wherein the HSA is attached to the base member. It is characterized by having.
- the HSA since the HSA is fixed to one base member together with the stator coil and the rotor section, the relative positioning between the information recording medium and the information conversion element can be performed with high accuracy. It can be done easily. Further, since the vibration of the rotor hub can be suppressed, the rotor hub stably rotates when the information recording medium is rotated by the motor for the information recording / reproducing apparatus.
- FIG. 1 is a sectional view showing an HDD provided with a motor according to an embodiment of the present invention.
- FIG. 2 is an enlarged sectional view showing a fluid dynamic pressure bearing portion in the HDD of FIG.
- FIG. 3 is an enlarged sectional view showing a motor in the HDD of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- an HDD (information recording / reproducing device) 1 includes a base member 3 constituting a housing of the HDDI, and a motor (for the information recording / reproducing device) attached to the base member 3.
- Motor for the information recording / reproducing device
- HSA 7 The motor 5 includes a stator coil 11 and a rotor 13 attached to the base member 3.
- the stator coil 11 includes a ring-shaped yoke 14, a plurality of cores 15 protruding from the inner peripheral surface side of the yoke 14, and coils 17 wound around each core 15.
- the coil 17 is electrically connected to a power source (not shown). Therefore, an alternating magnetic field can be formed by the core 15 and the coil 17.
- the rotor portion 13 includes a rotor hub 21 formed in a substantially cylindrical shape with a bottom, and a fluid dynamic bearing portion 23 that rotatably supports the rotor hub 21.
- the fluid dynamic bearing portion 23 has a shaft body 25 and a shaft body insertion hole 27 a into which the shaft body 25 is inserted, and is formed in a substantially cylindrical shape with a bottom.
- a liquid 29 such as oil filled in a gap between the shaft body 25 and the shaft body insertion hole 27a.
- a dynamic pressure generating groove 24 for collecting the liquid 29 is formed on the outer surface 25 a to 25 c of the shaft 25 and the inner surface 27 b to 27 d of the shaft insertion hole 27 a.
- the liquid 29 is collected in predetermined gaps R1 to R3 to generate dynamic pressure.
- the dynamic pressure plays the role of a bearing, and the shaft 27 is rotatably supported by the sleeve 27.
- the sleeve 27 has a small-diameter cylindrical portion 31 forming the closed end side of the shaft insertion hole 27a, and a large-diameter cylindrical portion 33 having an outer diameter larger than the small-diameter cylindrical portion 31.
- An annular end surface 35 orthogonal to the center axis A 1 is formed between the outer peripheral surface 31a of the small-diameter cylindrical portion 31 and the outer peripheral surface 33a of the large-diameter cylindrical portion 3'3. Have been.
- the rotor hub 21 is formed in a substantially cylindrical shape with a bottom, and a central portion of the bottom wall portion 37 has a through hole 37 a centered on the center axis A 1. Is formed.
- the Rotahapu 2 cylindrical wall that protrudes from the through-hole 3 7 to be fixed to the shaft body 2 5 by fitting the upper end portion of the shaft body 2 5 to a c periphery of the bottom wall 3 7
- An annular permanent magnet 41 is fixed to the outer peripheral surface 39 a of the portion 39.
- the permanent magnet 41 is a so-called radially anisotropic neodymium magnet in which a plurality of magnetic poles are arranged in an annular shape, and the magnetic flux direction of each magnetic pole matches the radial direction of the permanent magnet 41.
- the permanent magnet 41 is located so as to have a certain gap between the outer peripheral surface 41 a and the tip surface 15 a of the core 15.
- a step (fixed portion) 37 b for supporting a magnetic disk (information recording medium) 91 formed in a thin disk shape is formed on the periphery of the bottom wall portion 37 of the rotor hub 21. ing. By fitting a central hole 91 a formed in the center of the magnetic disk 91 into this step portion 37 b, the center axis A 1 along with the magnetic disk 91 force S, the rotor hub 21 and the shaft body 25 are rotated. It can be rotated at any time.
- HSA 7 has a magnetic head (information conversion element) 45 and this magnetic head.
- Rocking means 47 for positioning the rod 45 at a predetermined position.
- the magnetic head 45 records information on the magnetic disk 91 and reproduces information recorded on the magnetic disk 91.
- the swing means 47 swings the substantially cylindrical shaft body 49 fixed to the base member 3, the swing arm 51, and the swing arm 51 about the center axis A2 with respect to the shaft body 49. And a bearing portion 53 that is movably supported.
- the shaft body 49 is formed in the base member 3, and is fitted into a through hole 3a penetrating in the direction of the central axis A2.
- the shaft body 49 is formed with a step portion 55 protruding outward in the radial direction so as to abut against the surface 3 b of the base member 3 orthogonal to the center axis A 2. .
- the swing arm 51 swings about a center axis A 2, and the tip 51 a of the swing arm 51 extends along the front surface 9 1 b and the back surface 9 1 c of the magnetic disk 9 1. It is movable between the peripheral portion of 1a and the peripheral portion on the outer peripheral side.
- the above-described magnetic head 45 is fixed to the tip end 51 a of the swing arm 51 so as to be opposed to the front surface 9 lb and the back surface 91 c of the magnetic disk 91.
- the base member 3 is made of iron, and has a main wall portion 61 formed in a flat plate shape and a circular protrusion formed in a substantially bottomed cylindrical shape protruding in the thickness direction of the main wall portion 61. 6 and 3 are provided.
- a circular through hole 67 around the central axis A1 is formed at the center of the bottom wall portion 65 that forms the circular protrusion 63.
- an annular inner cylindrical wall portion 69 protruding from the bottom surface 65a of the bottom wall portion 65 is formed.
- the inner peripheral surface of the inner cylindrical wall portion 69 (the second mating surface) 69 a) has an inner diameter substantially matching the outer diameter of the small-diameter cylindrical portion 31 of the sleeve 27.
- the inner cylindrical wall 6 The tip surface (second abutting surface) 6 9 b of 9 is formed perpendicular to the center axis A 1, and the outer peripheral surface of the small-diameter cylindrical portion 31 and the large-diameter cylindrical portion 33 of the sleeve 27. It comes into contact with the end face 35 formed between 31a and 33a.
- An outer cylindrical wall portion 71 protruding from the outer peripheral edge of the bottom wall portion 65 toward the main wall portion 61 includes a step portion 7 whose diameter increases from the bottom wall portion 65 side to the main wall portion 61 side. 3 is formed, and the stepped portion 73 has a large-diameter inner peripheral surface (first mating surface) 75 located on the side of the main wall portion 61 and an end surface perpendicular to the center axis A1 (first Abutting surface) 7'7.
- the large-diameter inner peripheral surface 75 is formed around the center axis A 1, and the inner diameter dimension substantially matches the outer diameter dimension of the outer peripheral surface 14 a of the yoke 14 constituting the stator coil 11. ing. Therefore, the large-diameter inner peripheral surface 75 can fit the stator coil 11.
- the end face 77 of the stepped portion 73 is formed perpendicular to the center axis A 1, and abuts on the axial end face 11 a of the stator coil 11 when the stator coil 11 is fitted. It is like that.
- the base member 3 having the above-described shape is formed by press-forming a plate-like member made of iron.
- the shaft member 25 When attaching the rotor portion 13 to the base member 3, the shaft member 25 is inserted into the shaft member insertion hole 27a of the sleeve 27 in advance, and the shaft member insertion hole 27a and the shaft member Liquid is filled into the gap between the fluid dynamic pressure bearing 5 and the fluid dynamic pressure bearing 23. Then, the rotor haptic 21 to which the permanent magnet 41 is fixed is attached to the shaft body 25 to form the rotor portion 13 in advance. Thereby, before attaching the rotor portion 13 to the base member 3, relative positioning between the sleeve 27 and the permanent magnet 41 can be performed.
- the base member 3 is formed by press molding, The relative positioning between the tip surface 6 9 b of the inner cylindrical wall portion 69 in the direction of the axis A 1 and the end surface 77 of the outer cylindrical wall portion 71, and the inner peripheral surface 69 a of the inner cylindrical wall portion 69 The relative position between the outer cylindrical wall portion 7 1 and the large-diameter inner peripheral surface 75 can be accurately and easily determined.
- the end face 35 and the outer peripheral face 31 a of the sleeve 27 are brought into contact with the tip face 69 b and the inner peripheral face 69 a of the inner cylindrical wall portion 69, and the end face of the stator coil 11.
- the relative positioning between the stator coil 11 and the permanent magnet 41 can be accurately and easily performed.
- the magnetic center of the stator coil 11 and the magnetic center of the permanent magnet 41 in the direction of the center axis A1 can be accurately matched in the circumferential direction. Further, the gap between the outer peripheral surface 41a of the permanent magnet 41 and the distal end surface 15a of the stator coil 11 can be maintained at a constant interval in the circumferential direction.
- the magnetic center of the stator coil 11 in the direction of the center axis A1 and the magnetic center of the permanent magnet 41 are accurately matched in the circumferential direction, and the stator coil 11
- the gap between the stator coil 11 and the permanent magnet 41 and the variation of the magnetic center and the Due to this, the vibration of the rotor hub 21 and the generation of a pure tone can be suppressed.
- the base member 3 When the base member 3 is made of iron, the thickness of the base member 3 can be reduced while maintaining rigidity for holding the stator coil 11 and the sleep 27 in place. Therefore, the motor 5 can be made thinner. Furthermore, since the iron base member 3 has high rigidity, it is possible to suppress the base member 3 from vibrating when the rotor hub 21 is rotated.
- the HSA 7 and the rotor portion 13 are fixed to one base member 3, so that the relative position between the magnetic disk 91 and the magnetic head 45 is increased. Positioning can be performed accurately and easily. Further, since the vibration of the mouth hub 21 can be suppressed, when the magnetic disk 91 is rotated by the motor 5, the rotor haptic 21 rotates stably.
- the fluid dynamic pressure bearing portion 23 fills the gap between the shaft body 25 and the sleeve 27 with the liquid 29, but the present invention is not limited to this. Any configuration may be used as long as the rotor hub 21 and the shaft body 25 can be freely rotated with respect to the sleeve 27 by the fluid. Therefore, a gas such as air may be used instead of the liquid 29.
- the present invention is not limited to the magnetic disk 91, and may be, for example, an optical disk.
- an optical pickup for recording information on the optical disk and reproducing the information recorded on the optical disk is provided at the tip 51a of the swing arm 51. Just do it.
- the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes a design change or the like without departing from the gist of the present invention.
- the magnetic center of the stator coil in the axial direction and the magnetic center of the permanent magnet are accurately matched in the circumferential direction, and the gap between the permanent magnet and the stator coil is constant in the circumferential direction. Since the gap can be maintained, it is possible to suppress the vibration of the rotor hub and the generation of a pure tone based on the variation of the magnetic center gap between the stator coil and the permanent magnet.
- the base member is formed of iron, the thickness of the base member in the axial direction can be reduced, so that the motor for the information recording / reproducing apparatus can be reduced in thickness.
- the HSA When the information recording / reproducing device motor is provided in the recording medium driving device, the HSA is fixed to one base member together with the stator coil and the rotor portion. Relative positioning can be performed accurately and easily. In addition, since the rotor hub can be rotated stably, it is possible to prevent problems when writing information to the information recording medium or reading information from the information recording medium. .
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Rotational Drive Of Disk (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003075299A JP2006180566A (ja) | 2003-03-19 | 2003-03-19 | 情報記録再生装置用モータとこれを用いた情報記録再生装置 |
JP2003-075299 | 2003-03-19 |
Publications (1)
Publication Number | Publication Date |
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WO2004084382A1 true WO2004084382A1 (ja) | 2004-09-30 |
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ID=33027859
Family Applications (1)
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PCT/JP2004/003197 WO2004084382A1 (ja) | 2003-03-19 | 2004-03-11 | 情報記録再生装置用モータとこれを用いた情報記録再生装置 |
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WO (1) | WO2004084382A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001056023A (ja) * | 1999-08-18 | 2001-02-27 | Seiko Instruments Inc | スピンドルモータ |
EP1280147A2 (en) * | 2001-07-17 | 2003-01-29 | Matsushita Electric Industrial Co., Ltd. | Information recording and reproducing apparatus having a spindle motor and manufacturing method of spindle motor |
JP2003049828A (ja) * | 2001-08-06 | 2003-02-21 | Seiko Instruments Inc | 流体動圧軸受及びスピンドルモータ |
JP2003070217A (ja) * | 2001-08-27 | 2003-03-07 | Sony Corp | スピンドルモータおよびスピンドルモータを有する情報記録再生装置 |
-
2003
- 2003-03-19 JP JP2003075299A patent/JP2006180566A/ja active Pending
-
2004
- 2004-03-11 WO PCT/JP2004/003197 patent/WO2004084382A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001056023A (ja) * | 1999-08-18 | 2001-02-27 | Seiko Instruments Inc | スピンドルモータ |
EP1280147A2 (en) * | 2001-07-17 | 2003-01-29 | Matsushita Electric Industrial Co., Ltd. | Information recording and reproducing apparatus having a spindle motor and manufacturing method of spindle motor |
JP2003049828A (ja) * | 2001-08-06 | 2003-02-21 | Seiko Instruments Inc | 流体動圧軸受及びスピンドルモータ |
JP2003070217A (ja) * | 2001-08-27 | 2003-03-07 | Sony Corp | スピンドルモータおよびスピンドルモータを有する情報記録再生装置 |
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JP2006180566A (ja) | 2006-07-06 |
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