JP2502796Y2 - Motor - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly to a motor having a support member for supporting the rotor portion in the axial direction of a rotating shaft between the rotor portion and the stator portion.

[0002]

2. Description of the Related Art FIG. 4 is a plan view of a stator portion of a spindle motor of a disk device which is an example of a conventional motor.

In the figure, reference numeral 1 denotes a motor substrate (hereinafter simply referred to as a substrate) on which a stator portion 2 of a spindle motor (hereinafter simply referred to as a motor) is arranged. Since the rotor portion (the outer shape of the rotor case 8 forming the rotor portion is shown by a chain line in the drawing) is pivotally supported by the stator portion 2, the entire motor is provided on the substrate 1. . Reference numeral 3 is a bearing that axially supports a spindle shaft (not shown) of the rotor portion, and 4 is a support member that similarly supports the rotor portion in a rotatable manner in the axial direction of the spindle shaft (perpendicular to the paper surface). Reference numeral 5 is a support plate which is provided on the substrate 1 and serves as a base of the support member 4, and 6 is a coil which is also provided on the substrate 1 and applies a rotational force to the rotor portion. Further, 7 is a Hall element for detecting the reference position in the rotation direction of the rotor portion, and like the coil 6,
It is provided on the substrate 1.

In recent years, from the viewpoint of making the spindle motor thinner, the substrate 1 is formed to have a smaller thickness, and therefore the support plate 5 is allowed in relation to the coil 6 in order to prevent the substrate 1 from warping. It is formed as large as possible. Further, from the viewpoint of downsizing the spindle motor, the index magnet 9 of the rotor portion is provided inside the rotor case 8, and therefore the hall element 7 of the stator portion 2 is arranged so as to face the index magnet 9. It is arranged in a region near the center. Therefore, the three coils 6a in the same direction as the Hall element 7
Is arranged closer to the center than the other coils 6b, and accordingly, the coil 6a is arranged closer to the center on the outer peripheral portion of the support plate 5 which is formed as large as possible as described above. In addition, three notches 5a are formed along the circumferential direction.

[0005]

In the stator portion 2, the supporting plate 5 is fitted to the bearing 3 and simply placed on the substrate 1 in order to simplify the assembling process. It is provided. Therefore, when the support member 4 rotates with the rotation of the rotor portion, the support plate 5 also gradually rotationally displaces in the rotation direction of the support member 4.

Therefore, when the support plate 5 is rotationally displaced from the normal position of the support plate 5 shown in FIG. 4, the notches 5a are arranged so as to be closer to the ends 5a and 5b along the radial direction and to the center. The coil 6a comes into contact with the coil 6a and damages the coil 6a. As a result, the problem of insulation failure of the coil 6a occurs and the motor becomes defective.

Therefore, the present invention has been made in view of the above-mentioned problems, and by preventing the rotational displacement of the support plate,
The purpose is to prevent motor failure.

[0008]

In order to achieve the above object, the present invention provides a rotor portion having a rotary shaft, a rotor case fixed to the rotary shaft, and a magnet provided on the rotor case. A supporting plate for supporting the bearing of the rotor part and a plurality of coils radially arranged on the outer peripheral side of the supporting plate are a stator part arranged on the substrate, Among the coils, a predetermined first coil is provided in a portion closer to the center than the other second coils, and the supporting plate is a cutout for disposing the first coil closer to the center. A motor having a portion formed on the outer peripheral portion, wherein the solder or the electronic component that comes into contact with an end surface of the cutout portion of the support plate to prevent rotational displacement of the support plate is exposed in the cutout portion. Set in a convex shape And is a configuration.

[0009]

The rotation displacement of the supporting plate is prevented by the contact between the end surface of the notch of the supporting plate and the solder or the electronic component provided on the substrate in the notch of the supporting plate in a convex shape. The supporting plate is positioned in the circumferential direction.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway plan view of a spindle motor of a disk device which is an embodiment of a motor according to the present invention, FIG. 2 is a plan view of a stator portion of the motor shown in FIG. 1, and FIG. 2 is a sectional view taken along line III-III in FIG. Incidentally, FIG. 3 shows a cross section in a state where the rotor portion is mounted, but a cutting line III-III is shown in FIG. 2 for clarifying a cross section.

1 to 3, the structure of a spindle motor (hereinafter, simply referred to as a motor) 10 is almost the same as that of a conventional motor, and a stator portion 20 is impregnated by a spindle shaft 21 in a radial direction. A bearing 12 made of a binding metal, a support plate 14 arranged around the bearing 12 and supporting a support member 13 described later, and a rotor portion 30.
The coils 15a and 15b that apply a rotational force to the motor are arranged on a motor substrate (hereinafter, simply referred to as a substrate) 11.

Further, the rotor portion 20 has the spindle shaft 21 supported by the bearing 12, the rotor case 22 fixed to the spindle shaft 21 and having a substantially disk shape formed of a thin steel plate, and the coils 15a and 15b. A magnet 23 disposed on the lower surface of the rotor case 22 facing the
It comprises a drive pin 24 provided on the rotor case 22 for rotating a mounted disc (not shown), and a magnet 25 for magnetically fixing a metallic hub of the disc to the rotor case 22.

Further, an index magnet 26 is provided at an inner portion of the outer peripheral portion of the rotor case 22,
Hall elements 27 are provided at three locations on the substrate 11 facing the index magnet 26.

The support member 13 is one of the bearings that axially supports the rotor portion 30 in the axial direction of the spindle shaft 21 with respect to the bearing 12 that axially supports the rotor portion 30. This is a configuration in which 13a is held by an annular guide frame 13b in a rollable state. A steel ball 13a having exposed portions at the upper and lower portions of the guide frame 13b is sandwiched between a support plate 14 provided on the substrate 11 and a support plate 27 provided on the lower surface of the rotor case 22, and the steel ball 13a Bearing 1
By rolling around the circumference of the rotor 2, the rotor portion 30 is supported in the axial direction of the spindle shaft 21 with respect to the stator portion 20 in a rotatable state.

As shown in FIG. 2, the support plate 14 on the side of the stator section 20 has the coil 15a in the same direction as the Hall element 27, as described in the prior art.
In order to dispose them closer to the center side of 0, three notches 14a having ends 14b and 14c along the radial direction are formed along the circumferential direction.

In the motor 10 of this embodiment, the end portions 14b and 14c are located inside the cutout portion 14a.
A land for soldering, which is not related to other circuit wiring, is formed in advance on a portion of the substrate 1 which is in close proximity to, and solder 16 having a height of 0.2 to 0.7 mm is soldered on it. Form. Alternatively, electronic parts such as a chip jumper and a chip resistor may be mounted by soldering. Motor 1 of this embodiment
In No. 0, the notches 14a are provided at three locations, so the solder 16 is provided at a total of six locations.

As described above, by providing the solder 16 with an appropriate height in the vicinity of the ends 14b and 14c of the cutout 14a, the support plate 14 can rotate the support member 13 as described above. Even if it is attempted to rotate with it, any one of the end portions 14b, 14 corresponding to the rotation direction is
The c and the solder 16 come into contact with each other to prevent rotational displacement of the support plate 14. That is, when the support plate 14 rotates in the clockwise direction and the support member 13 rotates in the direction of the arrow A in FIG. 2, the end portion 14c and the solder 16 come into contact with each other to prevent the support plate 14 from rotating. On the contrary, when the support plate 14 rotates counterclockwise, the end portion 14b and the solder 16 come into contact with each other to prevent the support plate 14 from rotating.

In this way, the support plate 14 is fixed in position in the circumferential direction even if the rotor portion 20 rotates and the support member 13 rotates, so that the cutout portion 14 of the support plate 14 is fixed.
The ends 14b and 14c of a do not come into contact with the coil 15a provided near the center to cause insulation failure in the coil 15a, and the failure of the motor 10 is prevented.

The land for the solder 16 is the coil 1
Both ends of the windings 5a and 15b are formed at the same time as the lands used when soldering to the substrate 1, and the solder 16
The soldering work is also performed at the same time as the soldering work on both ends of the windings of the coils 15a and 15b (the soldering on both ends of the windings of the coils 15a and 15b is shown by 17 in the figure). Therefore, the formation of the solder 16 for preventing rotation does not affect the conventional process of forming the motor 10, and the present invention does not increase the cost of the motor 10.

The motor 1 of this embodiment constructed as described above
According to No. 0, the support plate 14 can be maximized and the substrate 11 can be thinned to realize the thinning of the motor 10. At the same time, the index magnet 26 and the hall element 27 are arranged inside the rotor case 22. By arranging, downsizing of the motor 10 can be realized. Therefore, when the motor 10 is used as a spindle motor for a disk device or the like as in the present embodiment, it greatly contributes to downsizing and thinning of the disk device.

Further, in the present embodiment, since the support plate 14 is circumferentially fixed on the substrate 11 as described above, the rotation of the support member 13 is more stable as compared with the conventional one, whereby the spindle shaft 21 is rotated. The change in squareness with respect to the substrate 11 is improved as compared with the conventional case.

In this embodiment, one notch 1
Although the solder 16 is formed at the positions close to the both ends 14b and 14c with respect to 4a, the present invention is not limited to this, and in the motor in which the rotation direction is predetermined, two of the notches are formed. The solder may be provided only on one of the two ends that prevents the rotational displacement of the support plate in the specific direction.
Further, the same effect can be obtained by providing an electric component (chip component) instead of forming the solder 16.

[0023]

As described above, according to the present invention, the end face of the notch portion of the supporting plate and the solder or the electronic component convexly provided on the substrate in the notch portion of the supporting plate come into contact with each other. It is possible to prevent rotational displacement of the supporting plate and fix the position in the circumferential direction. As a result, it is possible to prevent the notch portion of the supporting plate from coming into contact with the first coil provided closer to the center than the second coil to cause insulation failure in the first coil. It is possible to prevent defects.

Further, since the supporting plate is positionally fixed on the substrate in the circumferential direction, the rotation of the supporting member is more stable than in the conventional case, and the change in the squareness of the rotating shaft with respect to the substrate is improved as compared with the conventional case. be able to.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a spindle motor of a disk device which is an embodiment of a motor according to the present invention.

FIG. 2 is a plan view of a stator portion of the motor shown in FIG.

[Fig. 3] III-I in Fig. 2 of the motor according to the present invention
It is sectional drawing which follows the II line.

FIG. 4 is a plan view of a stator portion of a spindle motor of a disk device, which is an example of a conventional motor.

[Explanation of symbols]

 10 Spindle Motor 11 Motor Board 12 Bearing 13 Supporting Member 14 Support Plate 14a Cutouts 14b, 14c Ends 15a, 15b Coil 16, 17 Solder 20 Stator 21 Spindle Shaft 22 Rotor Case 23, 25 Magnet 24 Drive Pin 26 Index Magnet 27 Hall element 30 Rotor part

 ─────────────────────────────────────────────────── ─── Continued front page (72) Tadao Nakazawa, 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa Prefecture, Japan Victor Company of Japan, Ltd. (72) Daihachiro Takasu, 3-7-3, Nakamachi, Musashino-shi, Tokyo In YAKU Co., Ltd. (72) Inventor Sakaguchi ▲ Takahiro Yu 3-7-3 Nakamachi, Musashino-shi, Tokyo Inside teack Co., Ltd. (72) Yoji Abe 3-7-3 Nakamachi, Musashino-shi, Tokyo TEAC Incorporated (72) Inventor Hiroshi Yagawara 3-7-3 Nakamachi, Musashino-shi, Tokyo Inside TEAC Co., Ltd. (56) Reference JP 61-251464 (JP, A) JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A rotor part having a rotating shaft, a rotor case fixed to the rotating shaft, a magnet provided on the rotor case, a support plate for supporting a bearing of the rotor part, and A plurality of coils radially arranged on the outer peripheral side of the supporting plate includes a stator portion arranged on the substrate, and among the plurality of coils, the predetermined first coil is the other coil. It is located closer to the center than the second coil,
The supporting plate is a motor in which a notch for arranging the first coil closer to the center is formed in an outer peripheral portion, and the supporting plate is in contact with an end surface of the notch of the supporting plate. A motor having a structure in which a solder or an electronic component for preventing rotational displacement of the above is provided in a convex shape on the substrate exposed in the notch.