JPH10248224A - Motor for hard disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize thin type rotor section and stator section by forming a stator coil by laminating a plurality of insulation substrates each having a thin film coil made of a conductive material and providing a configuration capable of rotating a rotor by this stator coil. SOLUTION: A stator coil 8 constituting a stator section is formed by laminating a plurality of insulation substrates each having a thin film coil made of a conductive material. This stator coil 8 is provided on a chassis 21, and a rotor magnet 7 constituting the rotor section is set to a hard disk 6 which is supported by the chassis 21 through a bearing 10 and a shaft 9. By doing this, a thin rotor section and a thin stator section can be realized because the thin stator coil 6 and the thin rotor magnet 7 are adopted, thereby obtaining a thin type hard disk-driving motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor for a hard disk drive, and more particularly, to a motor for a hard disk drive which can be reduced in size and thickness.

[0002]

2. Description of the Related Art In recent years, hard disk drives have been significantly reduced in size. However, there is a demand for further miniaturization, and at present, miniaturization of each component constituting the hard disk drive is being studied. Among these components, there is a great demand for a smaller and thinner motor for rotating the disk.

Hereinafter, a conventional hard disk drive motor (brushless motor) used for rotating a hard disk drive will be described with reference to the drawings.

FIG. 11 is a sectional view of a conventional motor for a hard disk drive. The hard disk drive motor shown in FIG. 11 includes a stator core 11, an exciting coil 12, a printed wiring board 1
3, a bracket 14, a rotor magnet 15, a rotor frame 16, a ball bearing 18, and a fixed shaft 19, and the excitation coil 12 is electrically connected to the printed wiring board 13 using solder or the like. FIG. 11 shows a state in which the hard disk 20 is provided on the rotor frame 16 constituting the hard disk drive motor.

[0005] Next, the operation of the hard disk drive motor configured using the above components will be described. First, an alternating current is supplied to the excitation coil 12 to generate a rotating magnetic field in the stator core 11, and the rotor (the rotor magnet 15 and the rotor frame 16 using The stationary shaft 19 is configured by a rotating magnetic field generated in the stator core 11.
Rotate around the axis. The rotation of the rotor in this manner causes the hard disk 20 provided on the rotor frame 16 to rotate. That is,
In the hard disk drive motor according to the conventional technique, a stator portion is configured using the stator core 11 and the excitation coil 12 and the like, and a rotor portion is configured using the rotor magnet 15 and the rotor frame 16 and the like.

[0006]

In the hard disk drive motor according to the prior art, the rotor portion has a certain value or more in order to prevent the hard disk 20 provided on the rotor frame 16 from being shaken. Therefore, the overall thickness of the rotor frame 16 needs to be increased to some extent. Further, as described above, in order to rotate the rotor part having a certain size, it is necessary to generate an appropriate rotating magnetic field in the stator part. It is necessary to form the exciting coil 12 by winding.

As described above, since the rotor and the stator constituting the hard disk drive motor according to the prior art both need to have a certain thickness and a certain size or more, this is the size of the hard disk drive motor.・
This was an obstacle to thinning.

Accordingly, the present invention has been made to solve such a problem, and realizes thinning of a rotor portion and a stator portion by using thin stator coils and rotor magnets. An object of the present invention is to provide a thinned hard disk drive motor.

[0009]

According to a first aspect of the present invention, a hard disk drive motor according to the present invention is formed by laminating a plurality of insulating substrates each having a thin-film coil made of a conductive material. And a rotor rotated by the stator coil. According to the hard disk drive motor according to the present invention, the stator coil includes:
Since a plurality of thin insulating substrates each having a plurality of thin film coils (for example, a thin insulating substrate having a thickness of about several μm) are laminated, a stator coil having a large number of turns and a small overall thickness is used. Can be realized. Therefore,
It is also possible to reduce the thickness of the hard disk drive motor constituted by using this.

A second structure of the hard disk drive motor according to the present invention for achieving the above object is as follows.
A stator coil formed by laminating a plurality of insulating substrates each having a thin film coil made of a conductive material, and a rotor magnet formed on one surface of a hard disk, wherein the insulating substrate and the hard disk are They are provided to face each other.

According to the hard disk drive motor of the present invention, the stator portion is formed by using the stator coil, and the rotor portion is formed by using the rotor magnet. It is possible to reduce the thickness of the rotor portion, and it is also possible to reduce the thickness of a hard disk drive motor formed using these components. Specifically, since the stator coil is formed by laminating a plurality of thin insulating substrates each having a plurality of thin film coils (for example, a thin insulating substrate having a thickness of about several μm), the number of turns is small. A large and thin stator coil can be realized. Further, since the rotor portion is formed by forming the rotor magnet on the hard disk, it does not require a rotor frame or the like which has been conventionally required. Therefore, the rotor portion can be much thinner (smaller) than the rotor portion according to the related art.

Further, in the hard disk drive motor according to the present invention, the plurality of rotor magnets are provided in an annular shape on one surface of the hard disk so that the hard disk is appropriately rotated in opposition thereto. Preferably, the plurality of stator coils are provided in an annular shape. According to this preferred example, the hard disk can be appropriately rotated by appropriately arranging the rotor magnet and the stator coil in an annular shape.

Further, in the hard disk drive motor according to the present invention, it is preferable that the rotor magnet is formed using a ferromagnetic thin film. According to this preferred example, since a thin rotor magnet can be formed, a thin rotor portion can be realized. Further, as the ferromagnetic thin film,
For example, samarium-cobalt-based material or cobalt-
Platinum-based materials are exemplified. If these materials are used, a thin rotor magnet having a high coercive force can be obtained.

Further, in the hard disk drive motor according to the present invention, it is preferable that the rotor magnet is formed using a thin piece of a permanent magnet. According to this preferred example, since a thin rotor magnet can be obtained relatively easily, a thin rotor portion can be easily formed.

Further, in the motor for a hard disk drive according to the present invention, it is preferable that the insulating substrate is formed by using a film made of a polymer material. It is preferably at least one material selected from the group consisting of polyethylene, naphthalate and polycarbonate. According to this preferred example, an insulating substrate having excellent thermal stability or dimensional stability can be formed, so that a highly durable stator coil can be manufactured with high accuracy.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a motor for a hard disk drive according to a first embodiment of the present invention.

In the motor for a hard disk drive according to this embodiment shown in FIG. 1, a stator coil 8 constituting a stator portion is provided on a chassis 21, and a rotor magnet 7 constituting a rotor portion is mounted on a bearing. The hard disk 6 is supported by the chassis 21 via the shaft 10 and the shaft 9. Note that, as shown in the present embodiment, a core 22 may be arranged in the stator coil 8 as necessary.

According to the present embodiment, since the hard disk 6 is provided with the rotor magnet 7 having a reduced thickness, and the rotor is configured, a thin rotor can be realized. Further, since the present embodiment has a configuration in which the hard disk 6 is directly rotated, it is possible to more effectively prevent the hard disk 6 from being shaken than a configuration in which the hard disk is rotated via a rotor frame as in the related art. Further, since it is possible to make the rotor portion much thinner than the rotor portion according to the related art, the rotating magnetic field for driving the rotor portion to rotate can be made smaller than before.

Further, according to the present embodiment, the stator coil 8 is formed by laminating a “coil substrate” in which a plurality of thin film coils 4 are formed on an insulating substrate 5 as shown in FIG. Therefore, if a thin substrate having a thickness of several μm is used as the insulating substrate, it is possible to realize a stator coil 8 having a large number of turns and a small overall thickness, and thus a thin stator portion. be able to.

As described above, according to the present embodiment, the stator section is constituted by using the stator coil 8 which is made thinner, and the rotor section is constituted by using the rotor magnet 7 which is made thinner. Therefore, a thin hard disk drive motor can be realized.

Hereinafter, components such as the stator coil 8 and the rotor magnet 7 which are thinned to form the thin stator portion and the thin rotor portion will be specifically described. FIG. , Stator coil 8 constituting motor for hard disk drive according to first embodiment
Is shown. FIG. 3 is an exploded perspective view showing a laminated state of a stator coil 8 configured by laminating a coil substrate in which a plurality of thin film coils 4 are formed on an insulating substrate 5. Although FIG. 3 shows that there is a gap between the coil substrates, no actual gap is provided in actuality, and as shown in FIG. It is laminated. FIG. 5 shows a plan view of the coil substrate.

As shown in FIGS. 2, 3 and 5, the coil substrate comprises a plurality of thin film coils 4 on an insulating substrate 5.
Are arranged in an annular shape. The required number of coil substrates are stacked to form the stator coil 8.

As the insulating substrate 5, a film made of a polymer material is used. For example, polyimide film,
It is preferable to use a material having excellent thermal stability or dimensional stability, such as a polyamide film, a polyethylene naphthalate film, and a polycarbonate film.

FIG. 6 shows the planar shape of each of the thin-film coils 4 shown in FIGS. 2, 3 and 5. Specifically, the thin-film coil 4 is formed by the patterned coil portion 1, outer electrode portion 2, and inner electrode portion 3. The thin-film coil 4 is formed on the insulating substrate 5 by using a lithography technique, and is made of a material such as copper, gold, or aluminum by a method such as a plating method, a vapor deposition method, and a sputtering method using a resist pattern. Thus, it is formed as a highly conductive material thin film.

Next, a specific configuration of the stator coil 8 will be described. As described above, the stator coil 8
Is constituted by stacking a plurality of thin film coils 4 by stacking a plurality of coil substrates (FIGS. 2 and 3).
), And each coil substrate is configured as shown in FIG. The thin-film coil 4 formed on the coil substrate has a shape as shown in FIG.

Here, when laminating the coil substrates,
It is necessary to appropriately electrically connect the thin film coil 4 formed on each coil substrate to the thin film coil 4 formed on the upper and lower coil substrates. Hereinafter, the electrical connection of the thin film coil 4 formed on the insulating substrate 5 will be described with reference to FIG.

First, on the thin film coil 4a shown in FIG. 6A, a coil portion 1a constituting the thin film coil 4a is provided.
A thin film coil 4b having a coil portion 1b wound in the reverse direction (FIG. 6)
(See (b)). At this time, the thin film coil 4a
Outer electrode part 2 having a contact hole constituting
a and the outer electrode portion 2b constituting the thin-film coil 4b are stacked so as to overlap each other, and the thin-film coil 4a and the thin-film coil 4b are electrically connected via the contact hole of the outer electrode portion 2a.

Next, on the thin film coil 4b, a thin film coil 4c (see FIG. 6C) having a coil portion 1b constituting the thin film coil 4b and a reversely wound coil portion 1c is laminated. At this time, the inner electrode portion 3b having the contact hole constituting the thin-film coil 4b and the inner electrode portion 3c constituting the thin-film coil 4c are laminated so as to overlap with each other. To electrically connect the thin film coil 4b and the thin film coil 4c.

Next, on the thin film coil 4c, a thin film coil 4d (see FIG. 6D) having a coil portion 1c constituting the thin film coil 4c and a reversely wound coil portion 1d is laminated. At this time, the outer electrode portion 2c having the contact hole constituting the thin-film coil 4c and the outer electrode portion 2d constituting the thin-film coil 4d are laminated so as to overlap with each other. To electrically connect the thin film coil 4c and the thin film coil 4d.

By laminating a coil substrate formed by forming a plurality of thin film coils 4 on an insulating substrate 5 in accordance with the above-described laminating method, a stator coil 8 in which four thin film coils 4 are laminated is formed. (See FIG. 2). It is preferable to use a conductive paste such as a silver paste or a carbon paste for connecting the thin film coil 4 through the contact hole. It should be noted that the stator coil 8 according to the present invention is not limited to the four-layer one, and for example, as shown in FIG. It is possible to obtain the number of stacked stator coils 8.

FIG. 7 is a plan view of a coil substrate according to this embodiment having a thin film coil 4 having another shape. FIG. 8 shows the shape of each of the thin-film coils 4 shown in FIG. The thin-film coil 4 formed on the coil substrate constituting the hard disk drive motor according to the present embodiment is not limited to the above-described circular shape (see FIG. 6).
A trapezoidal shape as shown in FIG. Further, other shapes such as a triangular shape and a quadrangular shape may be used.

FIG. 9 is a plan view of a rotor portion constituting the hard disk drive motor according to the first embodiment of the present invention. As shown in FIG. 9, in the present embodiment, the hard disk 6 is provided with the rotor magnet 7 having a reduced thickness, and the rotor is configured. Therefore, a thin rotor can be realized. In the rotor portion, a rectangular rotor magnet 7 is arranged in an annular shape on one surface of a hard disk 6. In addition, the shape, arrangement position, and the like of the rotor magnet 7 are not limited to the present embodiment, and can be appropriately changed.

The rotor portion may be configured such that a thin film magnet formed by using the lithography technique is used as the rotor magnet 7 and the rotor magnet 7 is disposed on the hard disk 6 or a bulk magnet processed into a flake shape. May be used as the rotor magnet 7 and fixed to the hard disk 6. The material for forming the thin film magnet is not particularly limited, but it is preferable to use a samarium-cobalt or cobalt-platinum material capable of obtaining a high coercive force. As the material for forming the bulk magnet, all commonly used permanent magnet materials can be used.

As described above, according to the present embodiment, the stator portion is formed by using the thin stator coil 8 formed by laminating a plurality of coil substrates, and the thin rotor magnet is directly formed on the hard disk 6. 7, the rotor portion is formed, and the thinned stator portion and the rotor portion are used to configure a hard disk drive motor. Therefore, a thin hard disk drive motor can be realized. it can.

FIG. 10 is a sectional view of a hard disk drive motor according to a second embodiment of the present invention. The structures of the stator section and the rotor section according to the present embodiment are basically the same as those of the stator section and the rotor section constituting the hard disk drive motor according to the first embodiment.

The difference between the present embodiment and the first embodiment lies in the structure near the shaft 9. In the present embodiment, since the shaft 9 and the chassis 21 are connected, a thinner hard disk drive motor can be realized.

In each of the above embodiments, although not shown, the insulating substrate 5 constituting the coil substrate is not shown.
Above, a magnetoresistive element may be arranged for rotation control. Further, in each of the above embodiments, the synchronous motor in which the hard disk 6 is provided with the thinned rotor magnet 7 to constitute the rotor unit is described, but the present invention is not limited to this. For example, an induction motor without the rotor magnet 7 may be used.

[0038]

As described above, according to the present invention, the rotor portion and the stator portion are made thinner by using thin stator coils and rotor magnets, and the hard disk drive is made thinner by using them. Motor can be obtained. Therefore, it is possible to reduce the size and thickness of the hard disk drive.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hard disk drive motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a stator coil provided in the hard disk drive motor of FIG. 1;

FIG. 3 is an exploded perspective view showing a stacked state of coil substrates constituting a stator coil provided in the hard disk drive motor of FIG.

FIG. 4 is an exploded perspective view showing a laminated state when a large number of coil substrates are laminated.

FIG. 5 is a plan view of a coil substrate constituting the stator coil shown in FIGS. 2 and 3;

FIG. 6 is a plan view of a thin film coil formed on the coil substrate of FIG. 5;

FIG. 7 is a plan view of a coil substrate having a thin film coil having another shape.

FIG. 8 is a plan view of a thin film coil formed on the coil substrate of FIG. 7;

FIG. 9 is a plan view of a rotor unit provided in the hard disk drive motor according to the first embodiment of the present invention.

FIG. 10 is a sectional view of a hard disk drive motor according to a second embodiment of the present invention.

FIG. 11 is a cross-sectional view of a conventional hard disk drive motor.

[Explanation of symbols]

 1, 1a, 1b, 1c Coil part 2, 2a, 2b, 2c Outer electrode part 3, 3a, 3b, 3c Inner electrode part 4, 4a, 4b, 4c Thin film coil 5 Insulating substrate 6 Hard disk 7 Rotor magnet 8 Stator coil 9 Shaft 10 Bearing 21 Chassis 22 Core

Claims (8)

[Claims] 1. A hard disk drive comprising: a stator coil formed by laminating a plurality of insulating substrates provided with thin-film coils made of a conductive material; and a rotor rotated by the stator coil. motor. 2. The insulating substrate, comprising: a stator coil formed by laminating a plurality of insulating substrates each having a thin film coil made of a conductive material; and a rotor magnet formed on one surface of a hard disk. And a hard disk drive motor provided so as to face the hard disk. 3. A plurality of rotor magnets are provided in an annular shape on one surface of the hard disk, and a plurality of stator coils are provided in an annular shape so as to oppose the rotor magnet and rotate the hard disk appropriately. The motor for a hard disk drive according to claim 2, wherein 4. The hard disk drive motor according to claim 2, wherein said rotor magnet is formed using a ferromagnetic thin film. 5. The hard disk drive motor according to claim 4, wherein the ferromagnetic thin film is formed using a samarium-cobalt-based material or a cobalt-platinum-based material. 6. The motor for a hard disk drive according to claim 2, wherein the rotor magnet is formed using a thin piece of a permanent magnet. 7. The hard disk drive motor according to claim 2, wherein the insulating substrate is formed using a film made of a polymer material. 8. The motor for a hard disk drive according to claim 7, wherein the polymer material is at least one material selected from the group consisting of polyimide, polyamide, polyethylene naphthalate, and polycarbonate.