JPH08149772A - Motor - Google Patents

Abstract

PURPOSE: To realize highly accurate recording and reproduction while reducing the size by preventing rotational vibration of an information recording medium, e.g. a disc. CONSTITUTION: The motor comprises a stator 102 including a core 115, a winding wire 116 and a board 117, and a rotor 101 rotatable with respect to the stator 102 and including a rotor case 107, a rotor magnet 109 disposed thereon and a shaft 103 supported rotatably with respect to the stator 102. The rotor 101 is provided with a magnet 150 for magnetically attracting the rotor in the axial direction X thereof to the stator 102 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of an optimum motor for use in rotating an optical disk such as a CD-ROM which is an information recording medium.

[0002]

2. Description of the Related Art A motor for rotating an optical disk, which is an information recording medium, such as a CD-ROM or a magneto-optical disk, has a structure as shown in FIGS. The motor M is a spindle motor, and has a rotor 1 and a stator 2, and a shaft 3 of the rotor 1 has a turntable 4
Is attached. A disc D is detachably attached to the turntable 4. An optical pickup 5 is arranged near the spindle motor M so as to be movable in the radial direction of the disk D.

As shown in FIGS. 8 and 9, the rotor 1 includes a shaft 3, a turntable 4, a rotor boss 6, and a rotor case 7.
And a rotor magnet 9. On the other hand, the stator 2 includes the iron core 15 and the magnet wire (winding) 1.
6, a stator substrate 17, a housing 18, a metal bearing 19, a thrust receiver 20, a thrust receiving pressing plate 21, a Hall element 22 and the like. In such a spindle motor, when the magnet wire 16 is energized, a magnetic field is generated in the magnet wire 16, and the magnetic field lines pass through the iron core 15 and the rotor magnet 9 of the rotor 1 is detected.
To interact with the magnetic field lines passing through the rotor yoke 7. As a result, the rotor 1 rotates about the shaft 3 with respect to the stator 2.

[0004]

However, such a spindle motor has the following problems. In this type of spindle motor, the attraction force of the rotor 1 saturates the stator 2 relatively quickly. In order to increase the attraction force, an expensive rotor magnet 9 having a high magnetic force is required, but if the diameter of the motor is small, a sufficient rotor portion 1 can be obtained.
Can not get the suction power of. If the magnetic attraction of the rotor 1 to the stator 2 is to be obtained by shifting the magnetic center of the magnet wire 16 and the magnetic center of the rotor magnet 9, the height of the motor is increased by the amount of the shift. It will increase and hinder miniaturization. If the attracting force of the rotor portion is not sufficiently obtained with respect to the stator portion, the vibration resistance of the disk D attached to the turntable 4 is deteriorated, which is not suitable for in-vehicle use or portable use, and highly accurate information can be obtained. Cannot record or play.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and it is possible to realize miniaturization and to prevent the rotational shake of an information recording medium such as a disk and perform recording and reproduction with high accuracy. The purpose is to provide a motor.

[0006]

According to the invention described in claim 1, the above object is to provide a stator including an iron core, a winding wire, and a substrate, a rotor case, and a rotor magnet arranged in the rotor case. A rotor having a shaft rotatably supported with respect to the stator, and a rotor rotatable with respect to the stator, wherein the rotor is magnetically arranged on the stator side in the axial direction of the rotor. This is achieved by a motor having a suction magnet for attracting to. The above-mentioned object is, in the invention described in claim 2, rotatably supported with respect to a stator including an iron core, a winding wire, and a substrate, a rotor case, a rotor magnet arranged in the rotor case, and the stator. And a rotor rotatable with respect to the stator, wherein the substrate of the stator attracts the rotor magnetically toward the stator in the axial direction of the rotor. This is achieved by a motor equipped with a magnet for use. In the invention according to claim 3, the above-mentioned object is rotatably supported with respect to a stator including an iron core, a winding wire and a substrate, a rotor case, a rotor magnet arranged in the rotor case, and the stator. A rotor rotatable with respect to the stator, the rotor case of the rotor magnetically attracting the rotor toward the stator in the axial direction of the rotor. This is achieved by a motor with a magnet for attraction. In the invention according to claim 4, the above-mentioned object is rotatably supported with respect to a stator including an iron core, a winding wire, and a substrate, a rotor case, a rotor magnet arranged in the rotor case, and the stator. A rotor rotatable with respect to the stator, the rotor case of the rotor magnetically attracting the rotor toward the stator in the axial direction of the rotor. The attraction magnet is achieved by a motor integrated with the rotor magnet.

[0007]

According to the above structure, in the invention according to claim 1, the rotor is provided with the attraction magnet for magnetically attracting the rotor to the stator side in the axial direction of the rotor. Even if vibration is applied, the rotor rotates stably with respect to the stator. With the above-mentioned object, in the invention according to claim 2, since the stator substrate is provided with the attraction magnet for magnetically attracting the rotor to the stator side in the axial direction of the rotor, vibration is applied. However, the rotor stably rotates with respect to the stator. According to the invention of claim 3, the rotor case of the rotor is provided with an attracting magnet for magnetically attracting the rotor to the stator side in the axial direction of the rotor. The rotor rotates stably with respect to the stator even when the load is applied. In the invention according to claim 4, the above object is to:
The rotor case of the rotor is provided with an attraction magnet for magnetically attracting the rotor to the stator side in the axial direction of the rotor. Since the attraction magnet is integrated with the rotor magnet, even if vibration is applied, The rotor rotates stably with respect to the stator.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

Embodiment 1 FIGS. 1 and 2 show a preferred embodiment of the motor of the present invention. 1 and 2 is a spindle motor, and is a motor M for rotating an optical disc, for example, a disc D such as a CD-ROM or a magneto-optical disc. The motor M includes a rotor 101 and a stator 102. The rotor 101 includes a shaft 103 and a rotor boss 10.
4, a rotor case 107, a rotor magnet 109, an adhesive 140, and a suction magnet 150. On the other hand, the stator 102 includes the iron core 115, the magnet wire 116, the stator substrate 117, and the housing 1.
18, a metal bearing 119, a thrust receiver 120, a thrust receiving pressing plate 121, a hall element 122, and the like.

The rotor boss 104 is fixed to the shaft 103 by, for example, press fitting. The rotor boss is integrated with the rotor case 107, and
A rotor magnet 109 is arranged on the inner surface of 7. On the inner surface side (lower surface) of the rotor boss 104, the adhesive 1
A suction magnet 150 is provided via 40.

On the other hand, the iron core 115 of the stator 102 is attached to the housing 118, and
A metal bearing 119 rotatably supports the shaft 103 of the rotor 101. The end of the shaft 103 is
It is supported by the thrust receiver 120. The Hall element 122 detects information about rotation such as the rotation speed of the rotor unit 101.

The disc D in FIG. 1 is a disc medium such as a compact disc (CD) or a CD-ROM. Information can be recorded on the disc medium D through an optical pickup 105 that is normally used, or information recorded on the disc D can be optically reproduced. There is.
The optical pickup 105 includes an objective lens 105a and a light emitting / receiving element 105b, and moves in the radial direction of the disc D to optically read information recorded on the disc D or to read information on the disc D. Is recorded.

In the first embodiment shown in FIG. 1 and FIG. 2, since the attraction magnet 150 is arranged inside the rotor boss 104, the rotor 101 is fixed to the stator 102 by the magnetic attraction force of the attraction magnet 150. Iron core 115
On the other hand, it is sucked in the axial direction of the rotor 101 (direction of arrow X). In this way, the rotor 101
In the state of being attracted to 02, power is externally supplied to the magnet wire 116 of the stator 102 to generate a magnetic field in the magnet wire 116,
The lines of magnetic force pass through the iron core 115 and interact with the lines of magnetic force passing from the rotor magnet 109 of the rotor 101 to the rotor case 107. As a result, the rotor 101 becomes
The disc D on the turntable 104 is stably rotated at a predetermined speed together with the turntable 104. That is, the rotor 101 is the stator 102
Since it is attracted by the attraction magnet 150, the attraction force increases in the arrow X direction with respect to the axial direction of the rotor 101 of the disk D, and the disk D rotates stably. Therefore, the vibration resistance of the disk is improved, and even if the motor is arranged so as to be inclined, the vibration resistance of the disk D is unlikely to change depending on the posture. Moreover, since it is not necessary to shift the magnetic centers of the magnet wire and the low tag net as in the conventional case, the motor can be downsized.

Embodiment 2 Embodiment 2 of FIG. 3 is different from Embodiment 1 shown in FIGS. 1 and 2 in that the attraction magnet 250 is arranged on the stator substrate 117 on the stator 202 side. Is.
However, regarding each of the other constituent elements of the second embodiment of FIG. 3, the same elements as those of the corresponding constituent elements of the first embodiment of FIG. Example 1 of FIG. 2 is a type in which the attraction magnet is attached to the rotor 101 side, and the motor of FIG. 3 is a type in which the attraction magnet 250 is attached to the stator 202 side. As shown in FIG. 3, by arranging the attraction magnet 250 on the stator substrate 117, the attraction magnet 250 attracts the iron core 116 and the rotor case 107 in the arrow X direction. As a result, the suction force increases in the arrow X direction with respect to the axial direction of the rotor 201 of the disk D, and the disk D rotates stably. Therefore, the vibration resistance of the disk is improved, and even if the motor is arranged so as to be inclined, the vibration resistance of the disk D is unlikely to change depending on the posture. Moreover, since it is not necessary to shift the magnetic centers of the magnet wire and the low tag net as in the conventional case, the motor can be downsized. Suction magnet 250
Is easy to install, and the weight of the rotor 201 is
The weight of the rotor 101 in FIG. 2 is reduced.

Third Embodiment FIG. 4 shows a third embodiment of the motor of the present invention. Regarding each of the other components of the third embodiment of FIG.
The same elements as the corresponding constituent elements of the first embodiment of FIG.
The same reference numerals are given and the description thereof is omitted. Example 3 of FIG.
Then, the attraction magnet 316 is attached to the rotor case 107.
Attached to. That is, an extension portion 107a is formed on the rotor case 107 along the outer side in the radial direction, and the attraction magnet 316 is attached to the lower surface of the extension portion 107a. In this case, the attracting magnet 316 magnetically attracts the portion of the stator substrate 117 to move the rotor 301 to the stator 302.
Can be sucked to the side. As a result, the suction force increases in the arrow X direction with respect to the axial direction of the rotor 301 of the disk D, and the disk D rotates stably. Therefore, the vibration resistance of the disk is improved, and even if the motor is arranged so as to be inclined, the vibration resistance of the disk D is unlikely to change depending on the posture. Moreover, since it is not necessary to shift the magnetic centers of the magnet wire and the low tag net as in the conventional case, the motor can be downsized.

Fourth Embodiment FIG. 5 shows a fourth embodiment of the motor of the present invention. Figure 5
Regarding the other constituent elements of the fourth embodiment, the same elements as the corresponding constituent elements of the first embodiment of FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the attraction magnet 416 is arranged on the inner surface of the rotor case 107. The attraction magnet 416 is formed integrally with the rotor magnet 109 and has a substantially L-shaped cross section. The attraction magnet 416 is arranged at a position facing the iron core 115 in the axial direction of the shaft 103. As a result, the suction force increases in the arrow X direction with respect to the axial direction of the rotor 401 of the disk D, and the disk D rotates stably. Therefore, the vibration resistance of the disk is improved, and even if the motor is arranged so as to be inclined, the vibration resistance of the disk D is unlikely to change depending on the posture. Also,
Since it is not necessary to shift the magnetic centers of the magnet wire and the low tag net as in the conventional case, the motor can be downsized.

Embodiment 5 FIG. 6 shows Embodiment 5 of the motor of the present invention. Figure 6
Regarding the other constituent elements of the fifth embodiment, the same elements as the corresponding constituent elements of the first embodiment of FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the rotor 5
01 and a stator 502. An extension portion 507a is formed on the rotor case 507 of the rotor 501. A magnet 516 for attraction is provided on the lower surface of the extension portion 507a.
Is arranged. The rotor magnet 109 and the attraction magnet 516 are integrally formed, and are substantially L-shaped in cross section. This suction magnet 516 is
For example, by magnetically attracting the portion of the stator board 117 and the iron core 115,
It can be sucked to the 2 side. This allows the disc D
The suction force increases in the arrow X direction with respect to the axial direction of the rotor 501, and the rotor 501 stably rotates. Therefore, the vibration resistance of the disk is improved, and even if the motor is arranged so as to be inclined, the vibration resistance of the disk D is unlikely to change depending on the posture. Also, since it is not necessary to shift the magnetic centers of the magnet wire and the low tag net as in the past,
The motor can be downsized.

Sixth Embodiment FIG. 7 shows a sixth embodiment of the motor of the present invention. Figure 7
Regarding the other constituent elements of the sixth embodiment, the same elements as the corresponding constituent elements of the first embodiment of FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. The sixth embodiment shown in FIG. 7 has a shape formed by combining the fifth embodiment shown in FIG. 6 and the fourth embodiment shown in FIG. That is, the attraction magnets 616 and 626 are connected to the rotor magnet 109, and these magnets 109, 616, 626 are
It substantially covers the inner surface of the rotor case 608. The attraction magnets 616 and 626 are arranged at positions facing the iron core 115 in the axial direction of the shaft 103. As a result, the suction force increases in the arrow X direction with respect to the axial direction of the rotor 601 of the disk D, and the disk D rotates stably. Therefore, the vibration resistance of the disk is improved, and even if the motor is arranged so as to be inclined, the vibration resistance of the disk D is unlikely to change depending on the posture. Moreover, since it is not necessary to shift the magnetic centers of the magnet wire and the low tag net as in the conventional case, the motor can be downsized. In the motor of the present invention, a magnet is provided in a part of the rotor or the stator so that the rotatable rotor can be attracted in the axial direction, and the vibration resistance of the disk directly connected to the rotor is increased. Optimal for heavy duty applications with high vibration and impact. Since it is not necessary to use an expensive magnet having a high magnetic force, an inexpensive motor can be provided. Since the motor has plenty of posture, it is also suitable for vertical type and portable type.

The present invention is not limited to the above embodiment. In the embodiment described above, an optical disc which is an information recording medium, for example, a compact disc (CD) or a CD-RO.
It is used to rotate the disc when recording information on the M, magneto-optical disc, or reproducing the information recorded on these optical discs. However, the present invention is not limited to this, and the motor of the present invention can be incorporated in various devices other than the optical disk drive. For example, it can be used in the case where a laser polygon mirror is mounted on a turntable as an object and is rotated, or in a motor for winding and driving a tape such as a magnetic tape.

[0020]

As described above, according to the present invention, miniaturization can be achieved, and recording / reproducing can be performed with high accuracy by preventing rotational shake of an information recording medium such as a disc.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a disk drive device to which a first preferred embodiment of a motor according to the present invention is applied.

FIG. 2 is a sectional view showing the first embodiment of the motor shown in FIG. 1 in detail.

FIG. 3 is a diagram showing a second embodiment of the motor of the present invention.

FIG. 4 is a diagram showing Embodiment 3 of the motor of the present invention.

FIG. 5 is a diagram showing a fourth embodiment of the motor of the present invention.

FIG. 6 is a diagram showing Embodiment 5 of the motor of the present invention.

FIG. 7 is a diagram showing a sixth embodiment of the motor of the present invention.

FIG. 8 is a diagram showing an example of a conventional motor.

9 is an enlarged sectional view showing the conventional motor of FIG.

[Explanation of symbols]

 Reference Signs List 101 rotor 102 stator 103 shaft 104 turntable 108 rotor case 109 rotor magnet 113 shaft 115 iron core 116 magnet wire (winding wire) 117 stator substrate 118 housing 119 metal bearing 121 thrust bearing retainer plate 150 magnet for attraction X rotor axial direction

Claims (4)

[Claims] 1. A stator including an iron core, a winding wire, and a substrate, a rotor case, a rotor magnet arranged in the rotor case, and a shaft rotatably supported with respect to the stator. And a rotatable rotor, and the rotor is provided with an attraction magnet for magnetically attracting the rotor to the stator side in the axial direction of the rotor. 2. A stator including an iron core, a winding wire, and a substrate, a rotor case, a rotor magnet arranged in the rotor case, and a shaft rotatably supported with respect to the stator. And a rotor that is rotatable, and the substrate of the stator is provided with an attraction magnet for magnetically attracting the rotor to the stator side in the axial direction of the rotor. 3. A stator including an iron core, a winding wire, and a substrate, a rotor case, a rotor magnet arranged in the rotor case, and a shaft rotatably supported with respect to the stator. And a rotatable rotor, wherein the rotor case of the rotor is provided with an attraction magnet for magnetically attracting the rotor to the stator side in the axial direction of the rotor. . 4. A stator including an iron core, a winding wire, and a substrate, a rotor case, a rotor magnet arranged in the rotor case, and a shaft rotatably supported by the stator. The rotor case of the rotor is provided with an attraction magnet for magnetically attracting the rotor on the stator side in the axial direction of the rotor, and the attraction magnet is A motor characterized by being integrated with the rotor magnet.