JP2008079421A - Spindle motor stator fixing method and spindle motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator assembly technique by which the generation of an outgas is controlled while making a jig in a heating process unnecessary. <P>SOLUTION: A recessed portion 20A of a circular shape is formed on a base member 20. An adhesive 31, which has ultraviolet setting property and thermosetting property, is applied on the inside circumferential surface of the recessed portion 20A, while another adhesive 32, which has thermosetting property, is applied to the inside region from around the lower end portion inside circumferential surface of the recessed portion 20A. In this state, a stator 16 is mounted on the inside circumferential portion of the recessed portion 20A and fixed by a jig. The stator 16 is temporarily fixed by irradiating the ultraviolet ray and solidifying the adhesive 31 with the stator fixed by the jig. In this temporarily fixed state, the jig is removed. By putting into an oven the base member 20 with the stator 16 mounted and by performing heat treatment, the adhesive 32 is solidified. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for assembling a spindle motor mounted on a hard disk device or the like.

  In an assembly process of a spindle motor mounted on a hard disk device or the like, the stator is attached to the base member. This base member may be a part of a case of a hard disk device or a bracket attached to the device.

  For example, in an inner rotor type spindle motor, the outer peripheral surface of the stator core of the stator is fitted to the inner peripheral surface of the circular recess provided in the base member, and in that state, the stator core is fixed to the base member using an adhesive. is doing.

  In this case, in order to improve the centering accuracy (concentricity) of the stator core with respect to the base member, the outer periphery of the stator core is polished to improve the mounting accuracy of the base member with respect to the inner peripheral surface of the recess.

  The outer surface of the stator core is coated with an insulating resin, and a stator is formed by winding a coil thereon. That is, the coil is insulated from the stator core by the resin coating.

  However, if the outer peripheral surface of the stator core is cut to increase the concentricity of the stator core, the resin coating is peeled off. For this reason, it will be fixed to the base member with the outer peripheral surface of the stator core exposed, and there arises a problem that rust is generated in the stator core from this portion.

  In order to solve this problem, a method is adopted in which the outer diameter of the stator core is slightly smaller than the inner diameter of the circular recess of the base member so as not to damage the coating of the stator core. The stator core is fixed by filling an adhesive in between.

  There are various types of adhesives such as thermosetting adhesives, ultraviolet curable adhesives, and anaerobic adhesives, and it is desirable to use thermosetting adhesives that generate the least outgas. The spindle motor is used in, for example, a hard disk device. In the hard disk device, the space in which the hard disk is accommodated needs to be kept clean. This is because even a small amount of particles may cause a crash and damage data on the magnetic disk if it is caught between the disk and the magnetic head.

JP-A-2005-114106

  As described above, it is desirable to use a thermosetting adhesive as the adhesive. When using a thermosetting adhesive, the operation of fixing with a jig and heating in an oven or the like is performed with the adhesive applied between the members to be fixed.

  For example, a thermosetting adhesive is applied to the inner peripheral surface of the base member (primary application), and the stator is inserted. Further, a method has been adopted in which a thermosetting adhesive is applied between the status lots (secondary application), and the stator is fixed with a weight jig and then put into the oven.

  As described above, when the stator and the base member are bonded using the thermosetting adhesive, the members are put into the oven for the curing. And until the adhesive is solidified, it is necessary to align the stator core with the base member using a centering jig. That is, it is necessary to store the base member and the stator together with the centering jig in the oven, and a large-scale oven is required. Further, since the jig is stored in the oven together, the number of products that can be stored in the oven at a time is reduced. That is, the number of spindle motors that can be produced in a single heating process is reduced.

  Patent Document 1 relates to a technique for joining a bearing sleeve of a hydrodynamic bearing device to a base frame. In this document, two joint portions are provided between a bearing sleeve and a sleeve holding portion formed on a base frame through which the bearing sleeve is inserted. One is a joint formed at the back of the sleeve holding part, and an ultraviolet thermosetting adhesive is used. The other is a joint formed near the entrance of the sleeve holding part, and an anaerobic curable adhesive is used.

  Under such a structure, when assembly is performed by pushing the sleeve into the sleeve holding portion, the anaerobic curable adhesive is pushed inward of the joint portion. As a result, the joint near the entrance is immediately cured and temporarily fixed. Then, in a state where the temporary fixing is performed, the joining portion is heated while fixing the member using a simple jig, and the ultraviolet thermosetting adhesive is cured to complete the assembly. .

  In Patent Document 1, since temporary fixing is performed using an anaerobic adhesive, there is an advantage that a simple jig is sufficient when performing a heating operation. However, the adhesives used are both anaerobic and ultraviolet thermosetting adhesives that generate outgas, and countermeasures against outgas are necessary.

  In view of the above problems, an object of the present invention is to provide a stator assembly technique in which generation of outgas is suppressed while a jig in the heating process is not required.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a method of fixing a stator of a spindle motor to a base member, wherein the base member has a substantially circular recess, and the recess has the A stator is disposed, and the inner peripheral surface of the recess has a structure facing the outer peripheral surface in the radial direction of the stator, and the step of applying a first adhesive having ultraviolet curing to the inner peripheral surface; Applying a thermosetting second adhesive to the bottom surface of the recess, attaching the stator to the recess, fixing the attached stator with a jig, irradiating with ultraviolet rays, A step of curing the first adhesive, a step of removing the jig, and a heating step of curing the second adhesive by heating the base member on which the stator is mounted in an oven. The And butterflies.

  According to a second aspect of the present invention, in the spindle motor stator fixing method according to the first aspect, the first adhesive is applied from the inner peripheral surface to the bottom surface portion.

  According to a third aspect of the present invention, in the stator fixing method for a spindle motor according to the first or second aspect, the second adhesive is the bottom surface and has a diameter from the vicinity of the lower end of the inner peripheral surface. It is characterized by being applied inward in the direction.

  According to a fourth aspect of the present invention, in the spindle motor stator fixing method according to any one of the first to third aspects, the vicinity of the outer peripheral surface of the stator is fixed by the first adhesive, and the lower portion of the stator is fixed. The vicinity of the surface is fixed with the second adhesive.

  According to a fifth aspect of the present invention, in the stator fixing method for a spindle motor according to any one of the first to fourth aspects, the first adhesive also has thermosetting properties, and in the heating step, too. The first adhesive is cured.

  A sixth aspect of the present invention is the spindle motor stator fixing method according to any one of the first to fifth aspects, wherein the base member constitutes a part of a case of a hard disk device.

  According to a seventh aspect of the present invention, a base member on which a stator is mounted, a sleeve fixed to the base member, and a plurality of magnets are arranged in a ring so as to face the stator, and are rotatably supported by the sleeve. The base member is formed with a substantially circular recess, the stator is annularly disposed in the recess, and the inner peripheral surface of the recess is an outer peripheral surface in the radial direction of the stator. The gap between the concave portion and the stator is filled with a first adhesive having ultraviolet curing property on the inner peripheral surface, and the bottom surface portion of the concave portion has thermosetting property. It is filled with the 2nd adhesive agent which has.

  The invention according to claim 8 is the spindle motor according to claim 7, wherein the first adhesive is filled from the inner peripheral surface to the bottom surface portion.

  The invention according to claim 9 is the spindle motor according to claim 7 or claim 8, wherein the second adhesive is the bottom surface portion, and is radially inward from the vicinity of the lower end portion of the inner peripheral surface. It is characterized by being filled toward.

  According to a tenth aspect of the present invention, in the spindle motor according to any one of the seventh to ninth aspects, the vicinity of the outer peripheral surface of the stator is fixed by the first adhesive, and the vicinity of the lower surface of the stator is the It is fixed with a second adhesive.

  An eleventh aspect of the present invention is the spindle motor according to any one of the seventh to tenth aspects, wherein the first adhesive also has thermosetting properties.

  According to a twelfth aspect of the present invention, in the spindle motor according to any one of the seventh to eleventh aspects, the base member constitutes a part of a case of a hard disk device.

  The stator fixing method of the spindle motor of the present invention uses a first adhesive having ultraviolet curing property and a second adhesive having thermosetting property. Then, the first adhesive is cured by ultraviolet irradiation, and the jig is removed and placed in an oven in a state where the stator is temporarily fixed to the base member.

  Thereby, when putting in an oven, a jig | tool becomes unnecessary and the space in an oven can be utilized effectively. Since the number of products that can be put into the oven by one heat treatment can be increased, the production efficiency of the spindle motor can be improved.

  Moreover, it is sufficient to prepare a small amount of jigs necessary for the ultraviolet irradiation process, and the same number of jigs as the number of products to be put into the oven are not necessary as in the prior art. As a result, the number of jigs used can be greatly reduced, and the cost can be reduced.

  Further, by reducing the number of jigs to be used, assembly variations due to individual differences in jigs can be reduced.

  Furthermore, by reducing the number of jigs to be used, the number of man-hours for checking the dimensions of the jig itself can be greatly reduced.

  In the method of the present invention, only a part of the ultraviolet curable adhesive is used, and a thermosetting adhesive with less outgassing is used in combination. Thereby, the generation of particles is reduced, which is suitable for application to a hard disk device or the like of a spindle motor assembled by the method of the present invention.

{Configuration of spindle motor}
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of a spindle motor 1 according to the present embodiment. The spindle motor 1 is an inner rotor type spindle motor and is mounted and fixed on a base member 20.

  The base member 20 is a planar plate member, and a substantially circular recess 20A is formed in a part of the base member 20 in plan view. That is, the base member 20 is formed with a substantially circumferential bent portion 20B in plan view, and the base member 20 is bent downward at the bent portion 20B, and the height of the step is lowered to form the recess 20A. It is doing. The spindle motor 1 is placed and fixed in the recess 20A.

  A sleeve holding portion 20C for inserting and holding the sleeve 11 of the spindle motor 1 is formed at a substantially central portion of the recess 20A. A substantially circular sleeve insertion hole is formed in a substantially central portion of the recess 20A, and a substantially cylindrical sleeve holding portion 20C is formed around the hole.

  An insertion hole for the shaft 12 is provided in the central portion of the sleeve 11, and the shaft 12 is rotatably supported in the insertion hole. A rotor hub 13 that forms a rotor portion together with the shaft 12 is fixed to the upper end of the shaft 12. The rotor hub 13 is a substantially circular member formed in a plan view that is formed like a cup upside down. The outer peripheral end of the rotor hub 13 is provided with a flange 13a projecting outward in the radial direction, and a magnet holding part 13b projecting downward at a slightly inner portion in the radial direction from the flange 13a.

  The magnet holding portion 13b is a substantially cylindrical member in which a part of the rotor hub 13 extends downward, and a retaining member 14 is attached to the inner peripheral surface thereof. The retaining member 14 is a substantially cylindrical member, and its upper end portion is arranged so as to overlap with a protrusion formed on the upper end portion of the outer peripheral surface of the sleeve 11 in the axial direction, and includes a rotor including the rotor hub 13. The portion is configured not to be detached from the sleeve 11.

  An annular rotor magnet 15 magnetized with multiple poles is mounted on the outer peripheral surface of the magnet holding portion 13b. An annular stator 16 is disposed at a position facing the rotor magnet 15 in the radial direction.

  The stator 16 includes a stator core 16a formed by projecting a plurality of teeth from the annular core back portion toward the center in the radial direction, and a multi-phase (for example, three-phase) stator coil 16b wound around each tooth. It is composed of The stator 16 having such a configuration is attached to the base member 20. Specifically, a plurality of annular stator mounting holes 20D, 20D,... Are formed in the recess 20A of the base member 20, and the stator coil 16b of each tooth is fitted into the stator mounting hole 20D. In this manner, the stator 16 is mounted on the base member 20.

  A cap member 17 is attached to the lower part of the sleeve 11 and the shaft 12. As shown in the figure, the gap between the inner peripheral surface of the sleeve 11 and the outer peripheral surface of the shaft 12, the gap between the upper end surface of the sleeve 11 and the lower end surface of the rotor hub 13, the lower end surface of the sleeve 11 and the shaft 12, Lubricating oil 18 is filled in the gap between the upper end surface of the cap member 17. Then, a radial dynamic pressure generating groove having a herringbone shape, for example, is formed on either the inner peripheral surface of the sleeve 11 or the outer peripheral surface of the shaft 12, so that the radial fluid dynamics between the sleeve 11 and the shaft 12 are formed. The pressure bearing part is constituted. Further, a thrust fluid dynamic pressure generating groove, for example, having a spiral shape is formed on either the upper end surface of the sleeve 11 or the lower end surface of the rotor hub 13, so that a thrust fluid dynamic pressure bearing is provided between the sleeve 11 and the rotor hub 13. Part.

  In the vicinity of the lower side of the cap member 17, a substantially circular sealing member 21 is attached from the back side of the base member 20. Further, another seal member 22 is attached to the outer peripheral portion of the seal member 21. The seal member 22 seals the lower surface of the stator mounting hole 20D at the lower position of the stator mounting hole 20D.

  In the above configuration, the rotor hub 13 integrated with the rotor magnet 14 is rotationally driven by sequentially switching and supplying current to the stator coils 16b of each phase of the stator 16 and changing the magnetic flux in each tooth. A magnetic disk (not shown) is mounted on the rotor hub 13, and the magnetic disk is rotated by the rotational drive of the rotor hub 13.

{Assembly method of spindle motor to base member}
Next, a method for attaching the spindle motor 1 to the base member 20 will be described. FIG. 2 is an enlarged view of a side cross section near the outer periphery of the recess 20 </ b> A of the base member 20. Thus, a stator mounting hole 20D for inserting the stator 16 is formed slightly inside the outer peripheral portion of the recess 20A. That is, the base member 20 forms a flat portion again after being bent downward at the bent portion 20B, but the stator mounting hole 20D is formed at a position slightly inside from the vicinity of the lower end portion of the bent portion 20B. Yes. Further, the lower end of the stator mounting hole 20 </ b> D is sealed by a seal member 22.

  First, as shown in FIG. 3, an adhesive 31 is applied to the inner peripheral surface of the recess 20A. That is, the adhesive 31 is applied to the inner peripheral surface of the bent portion 20B. More specifically, the adhesive 31 is applied from the region slightly below the upper end of the inner peripheral surface of the recess 20A to the bottom surface of the recess 20A. As described above, the bent portion 20B is formed in a substantially circumferential shape in plan view. Therefore, the adhesive 31 is applied substantially circumferentially to the inner surface of the circumferential bent portion 20B. The adhesive 31 is an adhesive having both ultraviolet curable and thermosetting properties.

  Next, as shown in FIG. 4, an adhesive 32 is applied to the bottom surface of the recess 20A. In other words, the adhesive 32 is applied from the vicinity of the lower end portion of the inner peripheral surface of the concave portion 20A (the inner peripheral surface of the bent portion 20B) to the inner region in the radial direction. The adhesive 32 is an adhesive having thermosetting properties. Since the adhesive 32 does not have ultraviolet curability, it is an adhesive that generates little outgas.

  As described above, the adhesive 31 having ultraviolet curable property and thermosetting property is applied to the inner peripheral surface of the recess 20A, and the radial direction (herein, the radial direction is the direction of the spindle motor 1) from the vicinity of the lower end portion of the inner peripheral surface. In this case, the adhesive 32 having a thermosetting property is applied to a slightly inner region.

  FIG. 5 shows a state in which the stator 16 is mounted so that the stator coil 16b is aligned with the stator mounting hole 20D in such a state. That is, FIG. 1 is a view of a state in which all the components of the spindle motor 1 are mounted on the base member 20, but FIG. 5 is a view of the state before the sleeve 11 and the rotor portion are attached to the base member 20. Thus, when the spindle motor 1 is assembled, first, the stator 16 is mounted on the base member 20. The spindle motor 1 operates by utilizing a change in magnetic pole generated between the stator 16 and the rotor magnet 15. Therefore, high accuracy is required for the centering accuracy of the stator 16.

  As shown in FIG. 4, with the adhesive 31 and the adhesive 32 applied to the inner peripheral surface of the recess 20A, as shown in FIG. The space between the outer peripheral surface of the stator core 16a and the inner peripheral surface of the recess 20A is filled.

  FIG. 6 is an enlarged view of the bonding portion. A state in which the adhesive 31 is filled between the outer peripheral surface of the stator core 16a and the inner peripheral surface of the recess 20A is shown. In the figure, the area indicated by sand is the adhesive 31.

  The adhesive 32 is filled between the outer peripheral surface of the stator core 16 a and the inner peripheral surface of the stator insertion hole 20 </ b> D, or between the lower end surface of the stator coil 16 b and the upper end surface of the seal member 22. . In the figure, the region shown in a honeycomb shape indicates the adhesive 32.

  Next, the jig 3 is mounted in such a state. FIG. 7 is a side view of the jig 3. The jig 3 includes a lower jig 31 for placing and supporting the base member 20 on the upper part, and an upper jig 32 for fixing the base member 20 to which the stator 16 is mounted from the upper part.

  The lower jig 31 includes a support base 31a having a substantially circular shape in plan view, on which the base member 20 is placed and supported, and a protrusion 31b protruding upward from the center of the support base 31a. The lower jig 31 supports the base member 20 by inserting the protrusions 31b on the inner peripheral surface side of the sleeve support portion 20C formed on the base member 20. The upper jig 32 includes a stator fixing portion 32a and a screw portion 32b.

  FIG. 8 is a diagram showing a state in which the base member 20 with the stator 16 mounted thereon is placed on the support base 31a, and the upper jig 32 is mounted from above. That is, the stator 16 is mounted on the concave portion 20A of the base member 20 with the adhesive 31 and the adhesive 32 applied thereto, and the base member 20 in this state is placed on the support base 31a and the top is moved upward. It is fixed with a jig 31. By rotating the screw portion 32 b of the upper jig 31, the stator fixing portion 32 a is pressed toward the lower jig 31, and the base member 20 and the stator 16 are sandwiched and fixed by the lower jig 31 and the upper jig 32. I have to.

  At this time, as shown in the figure, the outer peripheral lower end surface of the stator fixing portion 32a abuts on the inner peripheral end surface of the stator core 16a, so that the centering accuracy of the stator core 16 is maintained. That is, when the protrusion 31b of the lower jig 31 is inserted into the inner peripheral surface of the sleeve holding portion 20C and the base member 20 is positioned, the inner peripheral surface of the stator core 16 contacts the stator fixing portion 32a. As a result, the stator 16 is centered.

  In this way, ultraviolet light is irradiated from above the stator 16 in a state where the base member 20 and the stator 16 are sandwiched and fixed by the jig 3. As shown in FIG. 6, an adhesive 31 is applied between the outer peripheral surface of the stator core 16a and the inner peripheral surface of the recess 20A of the base member 20 (the inner peripheral surface of the bent portion 20B). The adhesive 31 is exposed to the outside on the upper end side of the gap. And since this adhesive agent 31 has ultraviolet curing property, this adhesive agent 31 can be hardened by irradiating an ultraviolet-ray from the upper side. In this state, the adhesive 32 is not cured.

  When the adhesive 31 is cured, the stator 16 is temporarily fixed to the base member 20. In this state, the jig 3 is removed. At this time, since the stator 16 is fixed by the adhesive 31 while being fixed by the jig 3, the centering accuracy is maintained high.

  Then, the base member 20 on which the stator 16 with the jig 3 removed is mounted is put into an oven for heat treatment. By this heat treatment, the adhesive 32 is cured, and the adhesion state of the stator 16 to the base member 20 is strengthened. Further, as described above, the adhesive 31 has ultraviolet curability and also has thermosetting properties. Accordingly, the portion that is not exposed to the outside and is not cured by the ultraviolet rays is also cured by the heat treatment, and the adhesion state of the stator 16 can be strengthened.

  Thus, in the present embodiment, in order to attach the stator 16 to the base member 20, the adhesive 31 that is the first adhesive having ultraviolet curing properties and thermosetting properties, and the first thermosetting properties are provided. Adhesive 32, which is the second adhesive, was used. Then, with the jig 3 securing the centering accuracy of the stator 16, ultraviolet light is irradiated and temporary fixing is performed. Next, in the temporarily fixed state, the jig 3 was removed, and the base member 20 and the stator 16 were put into an oven to perform heat treatment.

  Thereby, since the jig | tool 3 can be removed at the time of oven insertion, the member size thrown into oven can be made very small. Conventionally, the base member 20 and the stator 16 are thrown into the oven with the jig 3 attached. As shown in FIG. 8, the jig 3 that is many times thicker than the base member 20 is thrown in. Space was needed in the oven. On the other hand, according to the method of the present embodiment, as shown in FIG. 5, only the very thin base member 20 and the stator 16 need be put into the oven. The space in the oven occupied by one set can be very small.

  This can greatly increase the number of base members 20 (or the number of stators 16) that can be put into the oven at one time. That is, since the space for the jig 3 is not required in the oven, a large number of products can be input by that amount, and the production efficiency can be greatly improved.

  In addition, the number of jigs 3 can be greatly reduced. Conventionally, for example, assuming that 600 sets of base members 20 and stators 16 are put in an oven, the number of sets, that is, 600 jigs 3 are required.

  In this regard, for example, when the set of 600 base members 20 and the stator 16 is heat-treated in an oven using the method of the present embodiment (in practice, a larger number of sets are used in an oven of the same size). However, here, the comparison is made with the same number.) The number of jigs 3 put into the oven is zero. Then, for example, about 10 or 20 jigs 3 may be used in the process of irradiating ultraviolet rays, which is the previous process. During the heat treatment, the ultraviolet irradiation process may be sequentially performed using these 10 to 20 jigs 3 to prepare a set for the next heat treatment. In this way, the number of jigs 3 can be greatly reduced, and the production cost can be reduced.

  In addition, the reduction in the number of jigs 3 used also leads to a reduction in product assembly variations caused by individual differences in the jigs 3. Even in comparison with the case where as many as 600 jigs 3 are used as in the prior art, variations due to individual differences can be made extremely small. Furthermore, it is possible to significantly reduce the jig dimension checking man-hour (jig management man-hour).

  Moreover, in this Embodiment, as shown in FIG. 4, the area | region which uses the adhesive agent 31 is a part, and the usage-amount of the adhesive agent 31 which has ultraviolet curable property can be decreased. Thereby, generation | occurrence | production of outgas can also be suppressed few.

{Outgas generation amount test}
FIG. 9 is a diagram comparing outgas generation amounts. In the figure, Type A and Type B are graphs in which the amount of gas generated after the stator 16 is mounted on the base member 20 by the method of the present embodiment is measured. The adhesive (TB1350C) used in this test is an adhesive containing an acrylic component having ultraviolet curing properties and thermosetting properties. That is, it corresponds to the adhesive 31 in the above embodiment. On the other hand, the adhesive (TB2087L) used in this test is a thermosetting epoxy resin adhesive. That is, it corresponds to the adhesive 32 in the above embodiment.

  Type A and Type B indicate gas generation amounts measured when an adhesion method corresponding to the method of the above embodiment is performed. That is, a thermosetting adhesive (TB2087L) and an ultraviolet curable and thermosetting adhesive (TB1350C) are used in combination.

  On the other hand, Type C is a graph showing the amount of gas generated when only a thermosetting adhesive (TB2087L) is used for bonding, and Type D is an adhesive having ultraviolet curing properties and thermosetting properties ( It is a graph which shows the gas generation amount at the time of adhere | attaching using only TB1350C).

  As shown in this graph, compared with the case of using only the ultraviolet curable adhesive (TB1350C) (Type D), the Type A or Type B method according to the method of the present embodiment generates very little gas. The result was obtained.

  In addition, by devising the heating time and introducing a degassing step, the amount of gas generated may be less than or equal to Type C using only thermosetting adhesive (TB2087L). did it. In the test shown in the figure, with respect to Type A and Type B, the amount of gas generated could be greatly reduced by applying heat treatment at 60 ° C. for 1 hour and 110 ° C. for 3 hours after irradiation with ultraviolet rays. .

  Thus, the spindle motor assembling method of the present embodiment is suitable for application to a hard disk device or the like because the generation amount of outgas is suppressed.

{Aspect of base member}
10 and 11 are diagrams showing the spindle motor 1 attached to the base member 20 by the above method. FIG. 10 is a diagram showing the inner surface side of the case 21 of the hard disk device 2, and FIG. 11 is a diagram showing the outer surface side of the case 21. The spindle motor 1 is attached to the inner surface side of the case 21.

  In the above embodiment, the base member 20 constitutes a part of the case 21 of the hard disk device 2 as shown in the drawing. For example, in the case of such a configuration, after the jig 3 is removed, the case 21 and the stator 16 are set as a set and heat treatment is performed in an oven.

  In addition, as shown in FIGS. 10 and 11, the base member 20 is a part of a case such as a hard disk device as it is, and there is a configuration in which the base member 20 is a part of a bracket. In this case, the bracket on which the spindle motor 1 is mounted is attached to various devices. In this case, the bracket on which the stator 16 is mounted is set and put into an oven for heat treatment.

It is side surface sectional drawing of the spindle motor attached to the base member. It is side surface sectional drawing of a stator mounting part. It is side surface sectional drawing of the stator mounting part of the state in which the adhesive which has ultraviolet curing property was apply | coated. It is side surface sectional drawing of the stator mounting part in the state by which the adhesive which has thermosetting was apply | coated to the inner side rather than the adhesive which has ultraviolet curable. It is side surface sectional drawing of the base member with which the stator was mounted | worn. It is side surface sectional drawing which shows the adhesion state of a stator. It is a side view of a jig. It is a side view which shows the state which has fixed the base member with which the stator was mounted | worn with the jig | tool. It is a figure which shows the test result which measured the generation amount of outgas. It is a figure which shows the case inner surface side of the hard-disk apparatus to which the spindle motor was attached. It is a figure which shows the outer surface side of a hard-disk apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spindle motor 20 Base member 16 Stator 16a Stator core 16b Stator coil 20A Recessed part 20B Bent part 20D Stator mounting hole 31 (having ultraviolet curing property and thermosetting property) Adhesive 32 (having thermosetting property)

Claims (12)

A method of fixing a spindle motor stator to a base member,
The base member has a substantially circular recess, the stator is disposed in the recess, and the inner peripheral surface of the recess is opposed to the outer peripheral surface in the radial direction of the stator,
Applying an ultraviolet curable first adhesive to the inner peripheral surface;
Applying a second adhesive having thermosetting property to the bottom surface of the recess;
Attaching the stator to the recess;
Fixing the attached stator with a jig;
Irradiating ultraviolet rays to cure the first adhesive;
Removing the jig;
Heating the base member on which the stator is mounted in an oven to cure the second adhesive;
A stator fixing method for a spindle motor, comprising: The stator fixing method of the spindle motor according to claim 1,
The method of fixing a stator of a spindle motor, wherein the first adhesive is applied from the inner peripheral surface to the bottom surface portion. In the stator fixing method of the spindle motor according to claim 1 or 2,
The method of fixing a stator of a spindle motor, wherein the second adhesive is applied to the bottom surface portion and radially inward from the vicinity of the lower end portion of the inner peripheral surface. In the spindle motor stator fixing method according to any one of claims 1 to 3,
A stator fixing method for a spindle motor, wherein the vicinity of the outer peripheral surface of the stator is fixed with the first adhesive, and the vicinity of the lower surface of the stator is fixed with the second adhesive. In the stator fixing method of the spindle motor according to any one of claims 1 to 4,
The method for fixing a stator of a spindle motor, wherein the first adhesive also has thermosetting properties, and the first adhesive is cured even in the heating step. In the stator fixing method of the spindle motor in any one of Claims 1 thru | or 5,
The spindle motor stator fixing method, wherein the base member constitutes a part of a case of a hard disk drive. A base member to which the stator is mounted;
A sleeve fixed to the base member;
A plurality of magnets arranged annularly at a position facing the stator, and a rotor rotatably supported by the sleeve;
With
The base member has a substantially circular recess, the stator is annularly disposed in the recess, and the inner peripheral surface of the recess faces the outer peripheral surface in the radial direction of the stator. ,
The gap between the recess and the stator is filled with a first adhesive having ultraviolet curing property on the inner peripheral surface, and a second adhesive having thermosetting property is filled on the bottom surface of the recess. A spindle motor characterized by The spindle motor according to claim 7, wherein
The spindle motor, wherein the first adhesive is filled from the inner peripheral surface to the bottom surface portion. The spindle motor according to claim 7 or 8,
The spindle motor according to claim 1, wherein the second adhesive is a bottom portion, and is filled inward in the radial direction from the vicinity of the lower end portion of the inner peripheral surface. The spindle motor according to any one of claims 7 to 9,
A spindle motor, wherein the vicinity of the outer peripheral surface of the stator is fixed with the first adhesive, and the vicinity of the lower surface of the stator is fixed with the second adhesive. The spindle motor according to any one of claims 7 to 10,
The spindle motor according to claim 1, wherein the first adhesive also has thermosetting properties. The spindle motor according to any one of claims 7 to 11,
The spindle motor, wherein the base member constitutes a part of a case of a hard disk device.

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