JP2002320367A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor in which the stator core 14 can be fixed dismountably with high accuracy through a simple arrangement. SOLUTION: A magnetic plate 14a2 disposed at the central position of magnetism in the laminating direction of a stator core 14 is abutted in the laminating direction, against the core positioning face 12a2 of a core supporting part 12a disposed at a position corresponding to the central position of magnetism in the axial direction of a drive magnet 23. Central position of magnetism on the stator core 14 side and the center of magnetism on the drive magnet 23 side can thereby be matched substantially. When a structure where the entirety of the stator core 14 is tightened to the core supporting part 12a by a screw member 13 inserted from the fixed motor board 11 side is employed, center of magnetism on the stator core 14 side can be set efficiently and highly accurately with respect to the center of magnetism of the drive magnet 23 by simply fixing the stator core 14 to the core supporting part 12a, the stator core 14 is secured rigidly with respect to the core supporting part 12a by means of the screw member 13, and dismantling of the stator core 14, repair by replacement of a component, and recycling are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor in which a stator core composed of a laminate of a plurality of magnetic plates is fixed to a core support on the stator side.

[0002]

2. Description of the Related Art In a general motor, for example, as shown in FIG. 9, a plurality of core supports are fixed to a core holder 3 of a core holder 3 fixed to a fixed motor substrate 2 constituting a stator 1 side. A stator core 4 composed of a laminate of two magnetic plates is attached. A core support portion provided on the outer peripheral side of the core holder 3 has a core insertion surface 3a having a substantially cylindrical shape, and a core positioning surface 3b provided so as to protrude radially from the core insertion surface 3a. Are formed so as to form a step shape, and the stator core 4
Is inserted by press fitting or the like along the outer peripheral surface of the core insertion surface 3a. Then, the stator core 4
The lower magnetic plate 4a located at the lower end in the drawing is in contact with the core positioning surface 3b, whereby the entire stator core 4 is held at a predetermined position in the axial direction. .

[0003] A rotor case 5 having a substantially thin plate shape is rotatably disposed outside the stator core 4 so as to cover the stator core 4, and is attached to the inner peripheral side of the rotor case 5. The annular driving magnet 6 is arranged so as to be close to and opposed to each salient pole on the stator core 4 side.

In such a motor, the magnetic center of the drive magnet 6 in the axial direction is defined by the stator core 4
There is one which is made to coincide with the magnetic center in the axial direction on the side. This is to prevent vibration and noise caused by a deviation between the magnetic centers of the drive magnet 6 and the stator core 4.

[0005]

However, even if the magnetic centers of the drive magnet 6 and the stator core 4 are designed to coincide with each other as described above, the dimensions of the respective parts are not changed after the actual assembly. The magnetic center is likely to be shifted due to natural variations. In particular, since the laminated body forming the above-described stator core 4 is formed by stacking a plurality of magnetic plates in the axial direction, errors in dimensions in the laminating direction (axial direction) are likely to occur, and manufacturing is performed accurately. In addition, productivity may be significantly reduced due to the assembly and assembly.

Accordingly, an object of the present invention is to provide a motor having a simple configuration and capable of assembling a stator core with high accuracy.

[0007]

In order to achieve the above object, in the motor according to the first aspect, the core position determining surface of the core supporting portion is positioned at a position corresponding to the magnetic center position in the axial direction of the drive magnet. On the other hand, among the plurality of magnetic plates constituting the stator core, the magnetic plate disposed at the magnetic center position in the stacking direction of the stator core is positioned with respect to the core position determining surface in the core support. By being abutted in the stacking direction, the magnetic center position on the stator core side is held so as to substantially coincide with the magnetic center of the drive magnet, and the entire stator core is moved from the fixed motor substrate side. A configuration in which the core member is fastened and fixed to the core support portion by an inserted screw member is employed.

According to the motor having the above configuration, the magnetic plate disposed at the magnetic center position in the stacking direction of the stator core is moved in the stacking direction with respect to the core positioning surface of the core support. Just by making contact, the magnetic center on the stator core side can be assembled with high precision and efficiency with respect to the magnetic center of the drive magnet. Has been reduced.

At this time, since the stator core is fastened and fixed to the core supporting portion by the screw member, the stator core is firmly fixed and the stator core can be disassembled by loosening and removing the screw member. Thus, repairs by component replacement and recycling are facilitated.

Further, in the motor according to claim 2, in addition to the above-mentioned claim 1, the stator core includes a lower half-side laminate and an upper half-side laminate having different shapes in the lamination direction, and The center mounting hole of the laminated body is fitted to the outer peripheral surface of the core positioning surface in the core supporting portion, and the peripheral portion of the center mounting hole in the upper half-side laminated body is in the core supporting portion. Due to the axial contact with the core positioning surface, the holding force of the lower half-side laminated body fitted on the outer peripheral surface of the core positioning surface in the core supporting portion causes the entire stator core to be in the core position. Easy and stable attachment to the support.

Further, in the motor according to the third aspect, in addition to the second aspect, since the upper half-side laminate is inserted into the core supporting portion in a loosely fitted state, the entire stator core is formed. It can be more easily and stably attached to the core support.

On the other hand, in the motor according to the fourth aspect, in addition to the first aspect, since the core supporting portion is formed integrally with the bearing member, the stator core is also highly accurate with respect to the bearing member. It is designed to be mounted so as to have a positional relationship.

According to a fifth aspect of the present invention, in addition to the first aspect, the fixed motor substrate is provided with a screw insertion hole for passing the screw member in the axial direction, and the screw insertion hole is provided. A concave portion is formed in the opening portion for receiving the head of the screw member so as to be buried therein, and at least one side of the core support portion or the stator core is inserted from a screw insertion hole of the fixed motor substrate. A screw through hole is provided to allow the screw member to penetrate in the axial direction in a loosely fitted state, and a distal end portion of the screw member penetrating the screw through hole is screwed to the magnetic plate inside in the laminating direction.

Therefore, the present invention has such a structure.
According to the motor according to the above, the core supporting portion is sandwiched between the stator core and the fixed motor substrate, so that the fixing is performed more firmly, and an extremely stable stator core fixing structure is obtained, and at the same time, the screw member Head of
Since it does not protrude from the fixed motor substrate, the fixed motor substrate can be mounted smoothly without any trouble, and the motor can be made thinner.

Further, in the motor according to the sixth aspect, in addition to the fifth aspect, the screw through hole is formed so as to cut off the outer peripheral edge of the core supporting portion, so that the core having a small diameter is formed. An excellent stator core fixing structure can be obtained for the support portion.

According to a seventh aspect of the present invention, in addition to the first aspect, the stator is provided with magnetic attraction means for urging the rotor side to pull in the axial direction. If the magnetic attraction means for urging the rotor side toward the stator side is used in combination with the above-described configurations, the magnetic center on the rotor side can be easily aligned with the magnetic center on the stator side. And it is maintained with high precision.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a spindle motor used in a rotary drive of various media disks such as a CD-ROM will be described below.

The entirety of the spindle motor for the shaft-rotating type media disk drive shown in FIGS.
Stator set 10 as a fixing member and stator set 1
0 and a rotor set 20 as a rotating member assembled in the axial direction. In the stator set 10, the fixed motor substrate (base plate) 1
1, a core holder 12 having an integral sliding bearing member is mounted on a substantially central portion on the front side (upper side in the drawing), and the core holder 12 includes three screw members 13
And is fixed together with the stator core 14. The detailed configuration of these will be described later.

A metal bearing 15 as a sliding bearing member is integrally formed on the inner peripheral portion of the core holder 12. As the metal bearing 15 formed integrally with the core holder 12, for example, a sintered oil-impregnated bearing member is employed, and a rotating shaft 21 is provided in a bearing hole provided in a central portion of the metal bearing 15. It is rotatably inserted and supported in the radial direction.

The rotating shaft 21 protrudes upward from an opening provided at the upper end side of the metal bearing 15 in the figure, and the lower end of the rotating shaft 21 forms a part of a spherical surface. A pivot portion 21a is provided. On the other hand, a thrust plate 16 is mounted so as to close an opening provided at the lower end of the metal bearing 15 in the figure, and a disk-shaped thrust receiving member 17 is mounted on the inner surface side of the thrust plate 16. ing. The pivot portion 21a provided on the lower end side of the rotary shaft 21 in the figure is arranged to make point contact with the upper surface of the thrust receiving member 17 in the figure. By the bearing structure, the whole of the rotating shaft 21 is supported in the thrust direction.

At this time, the point contact position between the pivot portion 21a and the thrust receiving member 17 in the pivot bearing structure is set to a reference position of the magnetic center position in the axial direction of the stator core 14 (vertical direction in the drawing). The magnetic center position of the stator core 14 will be described later.

Further, a region on the radially outer side of the core holder 12 formed integrally with the metal bearing 15 is
A stepped core support portion 12a is provided, and the above-described stator core 14 is inserted and fixed to the outer peripheral surface side of the core support portion 12a. A drive coil 18 is wound around each salient pole portion provided on the stator core 14.

At this time, as shown in FIGS. 3, 4 and 5, a relatively small-diameter substantially cylindrical shape is formed on the outer peripheral side wall surface of the core supporting portion 12a provided on the core holder 12. A core insertion surface 12a1 formed so as to be formed is provided, and a core positioning surface 12a2 is provided so as to protrude radially outward from a lower end edge of the core insertion surface 12a1 in the drawing. The outermost peripheral wall surface of the core positioning surface 12a2 is formed on a core fitting surface 12a3.

The center mounting hole of the stator core 14 is fitted to the core fitting surface 12a3 of the core support portion 12a by press-fitting or warm fitting, etc., and extends along the core insertion surface 12a1. The center mounting hole of the stator core 14 is inserted in the axial direction, and the peripheral portion of the center mounting hole of the stator core 14 is in axial contact with the core positioning surface 12a2.

That is, the stator core 14 is formed of a laminate of a plurality of magnetic plates.
The laminated body has two parts in the axial direction, that is, a laminated body 14a on the upper half side in the figure and a laminated body 14b on the lower half side in the figure.
It is composed of The lower half-side laminate 14b on the lower side in the drawing is fitted to the core fitting surface 12a3 having the maximum outer diameter of the core supporting portion 12a by press fitting or warm fitting. More specifically, as shown in FIG. 7, the core supporting portion 12a is provided at the center of each magnetic plate constituting the lower half-side laminate 14b.
A center mounting hole 14b1 having an appropriate press-fit tolerance is formed through the core fitting surface 12a3 that forms the outer peripheral wall surface of the core positioning surface 12b2, and the center mounting hole of the lower half-side laminate 14b is formed. 14b1 is the core supporting portion 12a
And is fixedly inserted into and fixed to the core fitting surface 12a3.

On the other hand, in the upper half-side laminate 14a in the upper part of the drawing, as shown in FIG. 6, the above-described portion is provided at the center of each magnetic plate constituting the upper half-side laminate 14a. A center mounting hole 14a1 having an inner diameter slightly larger than the outer diameter of the core insertion surface 12a of the core support portion 12a is formed therethrough, and the center mounting hole 14a of the upper half-side laminate 14a is formed.
1 is mounted on the outer peripheral side wall surface of the core insertion surface 12a of the core support portion 12a in a non-contact loose fit state having a gap in a radial direction.

The magnetic plate 14a2 (see FIG. 1) arranged on the lower end side of the upper half-side laminate 14a in the figure is positioned with respect to the core positioning surface 12a2 of the core support 12a.
It is configured to abut in the axial direction. The magnetic plate 1
The contact portion at 4a2 is set at the peripheral portion 14a3 of the center mounting hole 14a1 indicated by oblique lines in FIG.
Then, in this manner, the magnetic plate 1 of the upper half-side laminate 14a is
4a2 is axially abutted against the core position determining surface 12a2 of the core support portion 12a, so that the entire stator core 14 is positioned at a predetermined position in the axial direction, that is, the entire stator core 14 Are arranged so as to be positioned at the magnetic center position.

At this time, the upper half-side laminated body 14a and the lower half-side laminated body 14b of the stator core 14 are located at the magnetic center position of the whole stator core 14 arranged substantially at the center in the laminating direction (axial direction). The magnetic plate 14 is divided in the axial direction and is located at the lower end in the drawing of the upper half-side laminate 14a.
a2 is arranged at the magnetic center position of the stator core 14. Therefore, the magnetic center position of the stator core 14 is arranged on the core position determining surface 12a2 of the core support portion 12a.

The upper half-side laminate 14a and the lower half-side laminate 14b of the stator core 14 in the present embodiment are formed by laminating the same number of magnetic plates having the same thickness in the laminating direction. In addition, the magnetic center position is arranged at a center position in the stacking direction of the upper half-side laminate 14a and the lower half-side laminate 14b. However, such a symmetric shape in the thickness direction is not necessarily limited.

On the other hand, as shown in FIG. 1, a screw member 13 for fixing the stator core 14 is provided from the back side (lower side in the figure) of the fixed motor board (base plate) 11 in this embodiment. Are mounted so as to extend in the axial direction. Each of those screw members 13
In particular, as shown in FIG. 8, three screw insertion holes 11a, 11a, 11a penetratingly formed in the fixed motor substrate (base plate) 11 are mounted so as to pass therethrough. Core holder 12,
And a tip portion (upper end portion in the figure) of each of the screw members 13 penetrating the lower half-side laminate 14b of the stator core 14.
Are screwed to the upper half laminate 14 a of the stator core 14.

At this time, each of the screw members 13 includes
Countersunk screws are used, and each screw insertion hole 11 of the fixed motor substrate (base plate) 11 is adapted to correspond to the countersunk head 13a of each screw member 13.
“a” has a configuration in which an opening portion of the screw insertion hole 11a is provided with a concave portion having a mortar-shaped inclined surface. The dished heads 13a of the screw members 13 are accommodated and buried in the recesses of the screw insertion holes 11a. That is, by such an arrangement relation, the dish-shaped head 13a of each of the screw members 13 is formed.
Are mounted so as to form a flat surface without protruding from the surface of the fixed motor substrate 11.

For each such screw member 13, the core support portion 12a of the core holder 12 described above has a core position determining surface, as shown in FIGS. 2, 3 and 4, in particular. A threaded through hole 12a4 in the form of a groove is formed at a radially outwardly protruding portion constituting the portion 12b2 at a predetermined circumferential position corresponding to a portion through which the screw member 13 is inserted.
In the present embodiment, three recesses are provided. Each of the screw through holes 12a4 is provided so as to penetrate the core holder 12 in the axial direction, and the core support portion 12a
Is cut out in a groove shape having a substantially semicircular cross section.

On the other hand, as shown particularly in FIG. 7, the lower half-side laminated body 14b of the stator core 14 is provided on the inner peripheral wall surface of the center mounting hole 14b1 with the above-mentioned threaded thread on the core holder 12 side. In the present embodiment, the screw through-hole 14b2 is formed in a pair with the through-hole 12a4 in the circumferential direction.
It is recessed over each. That is, each of the screw through-holes 14b2 is formed in a groove shape having a substantially semicircular cross section substantially symmetric with the screw through-hole 12a4 on the core holder 12 side. By being symmetrically combined with the screw through hole 12a4 on the side, one hole shape through which the screw member 13 penetrates is defined.

The two screw through holes 12a4, 1
4b2 is inserted into each of the screw members 1
3 are inserted so as to penetrate in the axial direction, and the distal end portion (upper end portion in the drawing) 13b of each of the screw members 13 is fixed to the fixing hole 14a2 provided in the upper half side laminated body 14a of the stator core 14. Each is screwed by its own threading action. And in such a screwed state,
By tightening each of the screw members 13, the core supporting portion 12 a of the core holder 12 is firmly fixed between the stator core 14 and the fixed motor substrate 11 while being sandwiched in the axial direction. Has become.

Further, a boss portion 22a of an outer rotor type rotor case 22 having a thin bottom dish shape is fixed to an upper protruding portion of the rotary shaft 21.
At the outermost peripheral portion of the rotor case 22 extending radially outward from the outer case 2a, an annular cylindrical upright wall 22 is formed.
The drive magnet (permanent magnet) 23, which is also formed in a ring shape, is attached to the inner peripheral surface of the cylindrical upright wall 22b. A drive magnetized surface is formed on both the inner and outer circumferential surfaces of the annular drive magnet 23, and the drive magnetized surface on the inner circumferential side of the drive magnet surface is formed with respect to each salient pole portion of the stator core 14 described above. Are arranged so as to approach from the radially outer side. The magnetic center position of the drive magnet 23 in the axial direction is substantially aligned with the magnetic center position of the stator core 14 in the axial direction.

That is, as described above, the lower magnetic plate 14a2 of the upper half-side laminate 14a constituting the stator core 14 is laminated on the core position determining surface 12a2 of the core support 12a. By being positioned so as to abut in the direction (axial direction), the magnetic center position of the entire stator core 14 is
The core positioning surface 12a2 is set on the core positioning surface 12a2, and the core positioning surface 12a2 is located at the point contact position between the pivot portion 21a and the thrust receiving member 17 which constitute the pivot bearing described above. Is arranged at a position separated from the reference position by a predetermined distance in the axial direction, that is, the magnetic center position of the drive magnet 23 in the axial direction.

That is, the stator core 14 is simply mounted on the core support portion 12a, and the stator core 14
The entire magnetic center position is positioned so as to easily and accurately match the magnetic center position of the drive magnet 23.

On the other hand, a suction magnet 19a separate from the drive magnet 23 is mounted in a radially inner peripheral area of the magnetic plate located on the upper end side of the stator core 14 in the drawing. The attraction magnet 19a has a magnetic attraction force to draw the entire rotor case 22 in the axial direction toward the stator core 14 side, and the magnetic center of the driving magnet 23 and the stator core 14
This is for rotating and driving the rotor case 22 while maintaining the magnetic center of the rotor case 22 substantially in the axial direction, so as to prevent the vibration and noise generated when the two magnetic centers are displaced from each other. ing.

Similarly, the magnetic attraction member 19b is provided on the fixed motor substrate (base plate) 11 so as to face the drive magnet 23 in the axial direction.
The magnetic center of the drive magnet 23 and the magnetic center of the stator core 14 substantially coincide with each other in the axial direction by including the magnetic attraction member 19b in the magnetic circuit of the drive magnet 23. The rotor case 22 may be driven to rotate while maintaining the relationship.

Further, a hub table 25 as a disk mounting portion is provided on the upper surface side of the rotor case 22 in the figure. The hub base 25 is fixed so as to be inserted outside the boss portion 22a of the rotor case 22. A mounting hole of a recording media disk (not shown) is inserted into the hub base 25. Thus, the recording medium disk is mounted in a state where the entire recording medium disk is positioned in the radial direction.

In the spindle motor according to the present embodiment having such a configuration, the magnetic plate 14a2 of the upper half-side laminated body 14a disposed at the magnetic center position of the stator core 14 is fixed to the core position of the core support portion 12. Surface 12a2
The magnetic center of the stator core 14 is assembled with high precision and efficiency to the magnetic center of the drive magnet 23 only by making contact with the magnetic core in the stacking direction. Manufacturing and assembly errors are very well reduced.

At this time, since the stator core 14 is fastened and fixed to the core supporting portion 12a by the screw member 13, the stator core 14 is firmly fixed and the screw member 13 is loosened and removed. The stator core 14 can be disassembled, and repair by component replacement and recycling can be easily performed.

Further, in this embodiment, the stator core 1
4, since the center mounting hole 14b1 of the lower half-side laminate 14b is fitted to the core fitting surface 12a3 of the core supporting portion 12a, it is fitted to the core fitting surface 12a3 of the core supporting portion 12a. The entire holding of the stator core 14 is easily and stably attached to the core supporting portion 12a by the holding force of the lower half-side laminate 14b. Further, in the present embodiment, since the upper half-side laminate 14a is loosely inserted into the core support portion 12a, the entire stator core 14 is more easily and stably inserted into the core support portion 12a. It is designed to be attached.

On the other hand, in the present embodiment, the core support 12a
Are formed integrally with the metal bearing 15 as a bearing member, so that the stator core 14 is also attached to the metal bearing 15 so as to have a highly accurate positional relationship.

Further, in this embodiment, since the core supporting portion 12 is held between the stator core 14 and the fixed motor substrate 11 by the screw member 13, the fixing is more firmly performed and extremely stable. Thus, a fixed stator core fixing structure can be obtained. In addition, the fixed motor substrate 11
Since a concave portion for accommodating the head 13a of the screw member 13 so as to be buried therein is formed in an opening portion of the screw insertion hole 11a provided in the
Since it does not protrude from the fixed motor substrate 11, the fixed motor substrate 11 can be mounted smoothly without any trouble, and the motor can be made thinner.

Further, in the present embodiment, the screw holes 12
Since a4 is formed by notching the outer peripheral edge of the core support portion 12a, a good stator core fixing structure can be obtained even for the core support portion 12 having a small diameter.

Further, in this embodiment, the rotor set 2
Since the attraction magnet 19a as a magnetic attraction means for urging the zero side to the stator set 10 side is also used, the magnetic center of the rotor set 20 side and the stator set 1
The state where the magnetic center on the 0 side coincides with the precision with higher accuracy is favorably maintained. That is, since the magnetic center position on the stator core 14 side and the magnetic center position on the drive magnet 23 side are set so as to substantially coincide with each other, there is no vibration due to displacement of both, and a stable rotation state is obtained. It is supposed to be.

Although the embodiments of the present invention made by the inventor have been specifically described above, the present invention is not limited to the above-described embodiments, and can be variously modified without departing from the gist thereof. Needless to say.

For example, the stator core can be fixed to the core insertion surface 12a1 of the core support portion 12a by press fitting or the like.

Further, the stator core 14 is
When mounting on the a, if an adhesive is interposed in the gap between the stator core 14 and the core support portion 12a, the action and effect such as vibration prevention can be obtained. Then, when the adhesive is interposed in the above-mentioned gap portion, the passage width of the portion B1 which is open toward the radially outer side in the above-mentioned gap portion is gradually increased toward the outer side. Adhesive B by capillary action
Leakage can be prevented well.

Further, the above-described embodiment is the same as the CD-RO
Although the present invention is applied to a spindle motor for an M disk drive device, the present invention is not limited thereto, and various media disks such as a hard disk, a floppy (registered trademark) disk, and a DVD are used. The present invention can be similarly applied to a motor for rotating the motor and various other various motors.

The sliding bearing member to which the present invention is applied includes:
The present invention is not limited to the metal bearing as in each of the embodiments described above, and the present invention can be similarly applied to an apparatus using a dynamic pressure bearing member using dynamic pressure of a lubricating fluid.

[0053]

As described above, in the motor according to the first aspect of the present invention, the stator core is positioned with respect to the core position determining surface of the core supporting portion disposed at a position corresponding to the magnetic center position in the axial direction of the drive magnet. By contacting the magnetic plate disposed at the magnetic center position in the laminating direction in the laminating direction in the laminating direction, the magnetic center position on the stator core side is held so as to substantially coincide with the magnetic center on the drive magnet side, and the entire stator core is , Which employs a configuration in which the magnetic core on the stator core side is fixed to the magnetic core of the drive magnet simply by assembling the stator core to the core support portion with a screw member inserted from the fixed motor substrate side. The stator core to the core support with screw members. By tightening and fixing, the stator core is firmly fixed, and by loosening and removing the screw member, disassembly of the stator core, repair by replacement of parts, and recycling are facilitated, so both motor performance and productivity are improved. be able to.

According to a second aspect of the present invention, in addition to the first aspect, the stator core includes a lower half-side laminate and an upper half-side laminate having different shapes in the laminating direction. The center mounting hole of the laminated body is fitted to the outer peripheral surface of the core positioning surface in the core supporting portion, and the peripheral portion of the center mounting hole in the upper half-side laminated body is in the core supporting portion. The entire stator core is brought into contact with the core support portion by the holding force of the lower half-side laminate that is axially abutted against the core position determination surface and is fitted to the outer peripheral surface of the core position determination surface in the core support portion. Since it is designed to be easily and stably attached, it is possible to further improve the productivity, in particular, among the effects described above.

Further, the motor according to claim 3 is:
In addition to the above-mentioned claim 2, the upper half-side laminated body is loosely inserted into the core supporting portion so that the entire stator core can be more easily and stably attached to the core supporting portion. Therefore, among the effects described above, particularly, the productivity can be further improved.

According to a fourth aspect of the present invention, in addition to the first aspect, the core supporting portion is formed integrally with the bearing member, and the stator core also has a highly accurate positional relationship with the bearing member. Since it is configured to be mounted as described above, the above-described effects can be further improved.

According to a fifth aspect of the present invention, in addition to the first aspect, the fixed motor substrate further includes a screw insertion hole through which the screw member penetrates in the axial direction. A concave portion is formed in the opening to receive the head of the screw member so as to be buried therein, and at least one side of the core support portion or the stator core has a screw inserted from a screw insertion hole of the fixed motor substrate. A screw through hole is provided to allow the member to pass through the member in a loosely fitted state in the axial direction, and a tip end portion of the screw member penetrating the screw through hole is screwed to the magnetic plate inside in the laminating direction. By doing so, the core support portion is sandwiched between the stator core and the fixed motor substrate, so that more secure fixing is performed and the head of the screw member does not protrude from the fixed motor substrate. , Together with the attachment is carried out smoothly without any trouble of fixing the motor substrate, since it is that as it becomes possible thinning of the motor, while further improving the above effect, it is possible to enhance the usefulness of the motor.

Further, in the motor according to the sixth aspect, in addition to the fifth aspect, the screw through hole is formed so as to cut out the outer peripheral edge of the core supporting portion, and is formed in the small diameter core supporting portion. Also, since a good stator core fixing structure can be obtained, the usefulness of the motor can be enhanced while further improving the above-described effects.

Further, the motor according to claim 7 is:
In addition to the above-mentioned claim 1, the stator side is provided with magnetic attraction means for urging the rotor side to pull in the axial direction, so that the magnetic center on the rotor side and the magnetic center on the stator side are provided. Are maintained easily and with high precision in the state of the coincidence, so that among the above-mentioned effects, particularly the motor performance can be further improved.

[0060]

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing a structural example of a motor for a CD-ROM drive device to which the present invention is applied.

FIG. 2 is an explanatory plan view showing a schematic structure of a stator set of the motor shown in FIG. 1;

FIG. 3 is an explanatory longitudinal sectional view of a core holder integrally having a bearing member used in the motor shown in FIG. 1;

FIG. 4 is an explanatory plan view of the core holder integrated with the bearing member shown in FIG. 3;

5 is an explanatory bottom view of the core holder integrated with the bearing member shown in FIG. 3;

FIG. 6 is an explanatory plan view showing a shape of a magnetic plate constituting an upper half-side laminate of a stator core used in the motor shown in FIG. 1;

7 is an explanatory plan view showing a shape of a magnetic plate constituting a lower half-side laminate of a stator core used in the motor shown in FIG. 1;

8 is an explanatory plan view showing a schematic structure of a fixed motor substrate of the motor shown in FIG. 1;

FIG. 9 is an explanatory longitudinal sectional view showing a structural example of a motor for a conventional CD-ROM drive device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stator set 11 Fixed motor board (base plate) 11a Screw insertion hole 12 Core holder 12a Core support part 12a1 Core insertion surface 12a2 Core positioning surface 12a3 Core fitting surface 12a4 Screw through hole 13 Screw member 13a Plate head 14 Stator core 14a Upper half-side laminated body 14a1 Center mounting hole 14a2 Magnetic plate 14a3 Peripheral portion 14b Lower half-side laminated body 14b1 Center mounting hole 14b2 Screw through hole 15 Metal bearing 17 Thrust receiving member 19a Attraction magnet 19b Magnetic attraction member 20 Rotor set 21 Rotation Shaft 22 Rotor case 21a Pivot part 23 Drive magnet (permanent magnet)

Continued on the front page F term (reference) 5H019 AA06 AA10 CC04 DD01 EE01 EE14 GG03 5H615 AA01 AA05 BB01 BB04 BB07 BB14 BB16 PP01 PP02 PP11 SS20 TT04 TT05 5H621 GA01 GA04 HH01 JK13 PP03

Claims (7)

[Claims] 1. A stator core comprising a laminated body of a plurality of magnetic plates mounted on a core support attached to a fixed motor substrate, wherein the stator core extends in a radial direction at the core support. The whole of the stator core is held at a predetermined position in the axial direction by contacting a part of the stator core in the stacking direction with respect to the core positioning surface provided as described above, and the stator core faces the stator core. Thus, in the motor in which the drive magnets on the rotor side are arranged, the core positioning surface of the core support is arranged at a position corresponding to the magnetic center position in the axial direction of the drive magnets. Of the plurality of magnetic plates constituting the stator core, the magnetic plate disposed at the magnetic center position in the stacking direction of the stator core is By being in contact with the core position determining surface of the core support portion in the stacking direction, the magnetic center position on the stator core side is held so as to substantially coincide with the magnetic center of the drive magnet. A motor, wherein the entire stator core is fastened and fixed to the core support portion by a screw member inserted from the fixed motor substrate side. 2. The stator core includes a lower half-side laminated body and an upper half-side laminated body having different shapes in a laminating direction, wherein a center mounting hole of the lower half-side laminated body has a core position in the core supporting portion. Along with the outer peripheral surface of the fixed surface, the peripheral portion of the center mounting hole in the upper half-side laminate is axially abutted on the core position determining surface of the core support. The motor according to claim 1, wherein: 3. The upper half-side laminate is loosely inserted into a core support portion.
Motor as described. 4. The motor according to claim 1, wherein said core supporting portion is formed integrally with a bearing member. 5. A screw insertion hole for passing the screw member in the axial direction is formed in the fixed motor substrate, and a head of the screw member is buried in an opening of the screw insertion hole. A recess is formed to accommodate the screw member, and at least one side of the core supporting portion or the stator core has a screw member inserted through a screw insertion hole of the fixed motor substrate, through which the screw member penetrates in a free-fit state in the axial direction. The through hole is provided, and a tip portion of a screw member penetrating the screw through hole is screwed to the stator core side.
Motor as described. 6. The motor according to claim 5, wherein the screw through-hole is formed so as to cut off an outer peripheral edge of the core supporting portion. 7. The motor according to claim 1, wherein a magnetic attraction means is provided on the stator side to urge the rotor side to pull in the axial direction.