JP2003230247A - Stator supporting mechanism in motor, and method of manufacturing the supporting mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive stator supporting mechanism in a brushless motor by fixing a cap member and a stator core to a bearing housing firmly with good reliability in simplified structure, and doing away with the process of calking or bonding, and a method of manufacturing this supporting mechanism. <P>SOLUTION: A bearing housing 1 is press-fitted in the mounting hole 2a of a stator base 2, and a mounting part 1a is fixed to the stator base 2 by calking or the like. Moreover, a circuit board 3 is mounted on the opposite side from the mounting part 1a of the bearing housing 1 of the stator base 2. Moreover, the center hole 5a of the stator core 5, which is received on the step 1b of the peripheral large-diameter part of the bearing housing 1 and on which a coil 4 is wound, fits on the peripheral middle diameter part 1c of the bearing housing 1. Moreover, a bearing 6 is press-fitted at the inside periphery 1d of the bearing 1 so as to bear a rotary shaft 7. A cap member 9 is attached into the opening 1e of the bearing 1 so as to catch an oil packing 8 and a stator core 5. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an outer rotor type brushless motor. More specifically, the present invention relates to a stator support mechanism and a brushless motor including this mechanism.

[0002]

2. Description of the Related Art An outer rotor type brushless motor has a structure in which a bearing housing is fixed to a central portion of a stator base, and a shaft fixed to the center of a cup-shaped rotor yoke is rotated at an inner peripheral portion of the bearing housing. It holds a bearing that can be freely supported. An annular magnet having a plurality of magnetic poles is fixed to the inner peripheral portion of the cup-shaped rotor yoke. On the outer peripheral portion of the bearing housing, a stator having an armature formed by winding coils around a plurality of arms protruding in the radial direction from the central portion of a stator core formed by stacking magnetic plates is a magnetic pole of this annular magnet. It is fixed and supported facing the.

The brushless motor configured as described above is generally used as a spindle motor of a disk drive device (hereinafter abbreviated as a device). In recent years, in particular, this device has been required to have high performance such as miniaturization, high speed, low noise, low vibration, and long life, and the same high performance has been required for the spindle motor constituting this device. There is. In recent years, in response to this increase in performance, a hydrodynamic bearing has been adopted as the bearing of the brushless motor.

In this dynamic pressure fluid bearing, a dynamic pressure generating groove such as a herringbone groove is provided on the outer circumference of the rotary shaft or the inner peripheral surface of the bearing sleeve that is in sliding contact with the rotary shaft, and the gap between the rotary shaft and the sleeve is lubricated. This is a bearing having a structure in which a fluid is filled and a pressure is generated in the lubricating fluid in this gap by rotation of the rotating shaft, and the bearing of the rotor is rotatably supported by this pressure.

In the hydrodynamic bearing thus constructed, the bearing device itself can be miniaturized, and since fluid is present between the rotary shaft and the bearing, it is excellent in low noise, low vibration and impact resistance. Since the allowable load value can be large, it has the ability to suppress the runout of the rotating shaft to an extremely small level.

However, most of the lubricating fluid filled in the above-mentioned hydrodynamic bearing uses oil, so if this oil leaks out and is exhausted, the performance of the motor will be significantly deteriorated, and
Further, since there is a possibility that the leaked oil will scatter and contaminate the device, a cap member for preventing oil leakage is attached to the opening of the bearing housing.

[0007]

However, in the structure of the stator constructed as described above, the bearing housing and the stator core are fixed to each other and the cap member and the bearing housing are fixed to each other by press fitting, caulking or an adhesive. Since it was carried out by adhesion using the above, the fixing force is lowered due to impact during assembly work, repeated expansion and contraction due to temperature difference in the atmosphere used, and variations in the amount of adhesive applied. There is a risk that the stator core or the cap member may come off the bearing housing.

Further, at the assembly site of the motor, the caulking work and the adhering work require additional steps, which increases the cost, and it has been difficult to realize the cost reduction required by the market.

The present invention solves the above drawbacks.
A cap member for preventing leakage of oil of the lubricating fluid is inserted into the opening of the bearing housing, and the cap member is fitted and the stator core around which the coil is wound is fitted into the bearing housing. The present invention provides a stator support mechanism for a brushless motor, which realizes a strong and reliable fixation to the bearing housing, eliminates the step of caulking and bonding, and is inexpensive and simple.

[0010]

In order to solve the above problems, as in the invention described in claim 1, a bearing for supporting the rotating shaft of the rotor is held in the inner peripheral portion, and a lubricating fluid is provided in the opening. In a stator supporting mechanism of a motor, which comprises a bearing housing in which a cap member for preventing leakage of the oil is inserted and a stator core having a coil wound around the outer periphery is fixed, a receiving portion provided on a part of the outer periphery of the opening side of the bearing housing and This can be achieved by providing a retaining means that is provided on the side surface of the cap portion and that includes a locking portion that engages with the receiving portion.

According to a second aspect of the present invention, a cap holding portion that is pressed in the radial direction from the stator core may be provided in the locking portion of the retaining means, or the third aspect of the invention. As described above, this can be achieved by providing the retaining portion of the retaining means with the stator pressing portion that axially presses the stator core.

The receiving portion may be a protrusion provided near the opening-side outer peripheral edge of the bearing housing, and the locking portion may be provided on the cap portion. 6. The cap portion, which is made of an elastic portion and has a window portion fitted into the protrusion as the locking portion, is pressed against the cap portion in the radial direction from the stator core as in the invention according to claim 5. The cap pressing portion is provided, and the cap pressing portion is a flange portion that is pressed against the peripheral wall of the central hole of the stator core and fits the window portion into the protrusion as in the invention according to claim 6. Can be achieved by

Further, as in the invention described in claim 7, the receiving portion is a concave circumferential groove provided on the outer periphery of the opening side of the bearing housing, and the locking portion is provided on the cap portion. A cap portion comprising an elastic portion and having a claw portion having an L-shaped cross section that is fitted into the concave circumferential groove as the locking portion, and the cylindrical side surface portion of the cap portion is formed as in the invention according to claim 8. A cap pressing portion that is pressed in the radial direction from the stator core is provided, and the cylindrical side surface portion is pressed against the peripheral wall of the central hole of the stator core so that the claw portion is formed into the concave circumferential groove, as in the invention according to claim 9. This can be achieved by cutting the opening to be fitted.

Further, as in the invention described in claim 10, the receiving portion is a concave circumferential groove provided on the outer periphery of the bearing housing on the opening side, and the locking portion is provided on the cap portion. The cap part which is made of an elastic part and has a cut-and-raised claw whose upper surface side fitted into the concave circumferential groove as the locking part is cut off and bent inward, and the cap part has the cap part according to claim 11. As in the invention, a cap pressing portion that is pressed in the radial direction from the stator core is provided, and the cap pressing portion is the same as the invention according to claim 12.
This can be achieved by forming a flange portion that is pressed against the peripheral wall of the central hole of the stator core and that fits the cut-and-raised claw into the concave peripheral groove.

The method of manufacturing the stator support mechanism for the motor is the same as the invention according to claim 13.
The retaining means according to claim 3 is prepared, the bearing housing is fixed to the stator base, the bearing is press-fitted into a predetermined position of the inner peripheral portion of the bearing housing, and then the lubricating fluid is filled into the bearing housing. This can be achieved by inserting the cap member into the opening of, and fitting the central hole of the stator core around which the coil is wound into the retaining means of the cap member and into the outer peripheral portion of the bearing housing.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a main part of a stator support mechanism showing a first embodiment of the present invention. In FIG. 1, the bearing housing 1 is press-fitted into a mounting hole 2a of a stator base 2 and the mounting portion 1a is fixed to the stator base 2 by caulking or the like. Further, the circuit board 3 is provided on the surface of the stator base 2 opposite to the mounting portion 1a of the bearing housing 1.
Is installed.

Further, a stator core 5 wound with a coil 4 is received by the outer peripheral large diameter step portion 1b of the bearing housing 1.
The central hole 5a of the above is fitted into the outer peripheral medium diameter portion 1c of the bearing housing 1. A bearing 6 is press-fitted into the inner peripheral portion 1d of the bearing housing 1 to support a rotating shaft 7. A cap member 9 is attached to the opening 1e of the bearing housing 1 so as to fix the oil packing 8 and the stator core 5.

2 and 3 are perspective views of the bearing housing 1 and the cap member 9 for explaining the mounting structure in more detail. In FIG. 2, the bearing housing 1 is made of a metal material or a resin material, and has a small outer peripheral diameter portion 1f.
In the vicinity of the opening 1e, a wedge-shaped projection 1g that is inclined in the direction opposite to the opening 1e and has a maximum diameter smaller than the diameter of the central hole 1a of the bearing housing 1 is formed.

In FIG. 3, the cap member 9 is a cup-shaped member made of an elastic member made of metal or resin, and the side surface of the cylinder has a flange portion 9e and a bent portion 9d which are cut toward the opening side, and the inner diameter of the cylinder. The size is larger than the diameter of the outer peripheral small diameter portion 1f of the bearing housing 1 and smaller than the diameter drawn by the base of the protrusion 1g of the bearing housing 1, and the flange portion 9
The outer diameter of e is slightly larger than the diameter of the central hole 5a of the stator core 5, and a hole 9a having a diameter larger than the outer diameter of the rotating shaft 7 is formed in the center. Further, the cylindrical side surface 9b having the flange portion 9e is provided with a window portion 9c having a size capable of being fitted into the wedge-shaped protrusion 1g of the bearing housing 1, and the bent portion 9 expands toward the outer side of the opening. The widened tip is cut and bent to a position that draws a circle larger than the diameter of the central hole 5a of the stator core 5.

Referring to FIGS. 1, 2 and 3, the cap member 9 attached to the opening 1e of the bearing housing 1 is shown.
The state of fixing the stator core 5 by the cap member 9 will be described. That is, the flange portion 9e of the cap member 9 attached to the opening 1e of the bearing housing 1 with the oil packing 8 sandwiched between the central hole 5 of the stator core 5 and the flange portion 9e.
The window portion 9c is pressed by the peripheral wall of a, and the window portion 9c is fitted into the protrusion portion 1g of the bearing housing 1. Further, the tip of the bent portion 9d of the cap member 9 is provided at the outer peripheral large-diameter portion step portion 1 of the bearing housing 1.
The peripheral surface 5b of the peripheral edge of the central hole 5a of the stator core 5 fitted to the position b is pressed.

The oil packing 8 prevents the oil of the lubricating fluid from leaking out, and its central hole is formed with a minimum clearance that does not hinder the rotation of the rotary shaft 7. The oil packing 8 may be omitted if the central hole 9a of the cap member 9 can also prevent the leakage of the oil. Further, the protrusion 1h provided in the axial direction on the outer peripheral medium diameter portion 1c of the bearing housing 1 in FIG. 2 is for positioning the stator core 5 fitted in the outer peripheral medium diameter portion 1c. If this positioning can be performed by an assembly jig, the protrusion 1h may be omitted. It should be noted that the protrusion 1g of the bearing housing 1 and the window 9c and the bent portion 9d of the cap member 9 which form the retaining means according to the present invention may be provided at one or more locations.

FIG. 4 illustrates a method of manufacturing a stator support mechanism according to the present invention. First, the mounting portion 1a of the bearing housing 1 is inserted into the mounting hole 2a of the stator base 2 and fixed by caulking or the like. The fixing may be performed by welding, press fitting, bonding, or an integral molding method of insert or outsert. Next, the circuit board 3 is mounted on the side surface of the stator base 2 opposite to the mounting portion 1a. The circuit board 3 may be one in which the structure and the circuit portion are integrated, such as an iron board. Next, the bearing 6 is pressed into the inner peripheral portion 1d of the bearing housing 1 to a predetermined position. Next, while the oil packing 8 is housed inside, the window 9c of the cap member 9 is aligned with the protrusion 1g of the bearing housing 1 and is inserted into the outer peripheral small-diameter portion 1f of the bearing housing 1.

Next, the insertion guide portion 5c of the stator core 5 around which the coil 4 is wound is aligned with the core insertion positioning projection 1h of the bearing housing 1, and the central hole 5a of the bearing housing 1 is fitted into the cap member 8 while being fitted therein. The outer peripheral large diameter portion step portion 1b is fitted into the outer peripheral medium diameter portion 1c. As a result, the flange portion 9e of the cap member 9 is pressed against the peripheral wall of the central hole 5a of the stator core 5, so that the window portion 9c is firmly fitted into the protruding portion 1g of the bearing housing 1 and the bent portion of the cap member 9 is bent. 9d is the stator core 5
The central hole 5a of the stator core 5 spreads out, presses the peripheral surface of the central hole 5a of the stator core 5, and the stator core 5 and the cap member 9 are firmly fixed to the bearing housing 1. Further, the stator core 5 fixed by closing the bent portion 9d of the cap member 9 with a dedicated jig can be easily removed from the bearing housing 5, and the model can be changed and the parts can be reused.

FIG. 5 is a cross-sectional view of the essential parts showing the structure of the brushless motor having the stator support mechanism according to the first embodiment of the present invention. In FIG. 5, a bearing housing 1 is fixed to a stator base 2, and a circuit board 3 is mounted on the stator base 2.

Further, on the inner peripheral portion of the bearing housing 1, a rotary shaft 7 is press-fitted into the center of a rotor yoke 12 having a cup-shaped annular magnet 11 having a plurality of magnetic poles fixed to the inner peripheral surface thereof. A bearing 6 which is rotatably supported is held, and a cap member 9 holding an oil packing 8 for preventing leakage of oil is fixed to the opening. A stator core 5 around which a coil 4 is wound is fixedly attached to the outer peripheral portion of the bearing housing 1. The stator core 5 and the cap member 9 are fixed to the bearing housing 1 by inserting the stator core 5 and the cap member 9 into each other via the bearing housing 1 as described above.

FIG. 6 is a cross-sectional view of a main part of a stator support mechanism showing a second embodiment of the present invention. FIG. 7 is a perspective view showing details of the cap member according to FIG. The configuration of FIG. 6 is basically the same as the configuration of FIG. 1, except that a concave circumferential groove 21g is formed at a position overlapping the central hole 5a of the stator core 5 of the outer peripheral small diameter portion 21f of the bearing housing 21. .

The cap member 29 is, as shown in FIG.
It is a cup shape made of an elastic member made of metal or resin, and extends toward the outside of the opening on the side surface of the cylinder, and its tip is cut and raised to a position where it draws a circle larger than the diameter of the central hole 5a of the stator core 5, and is bent. The bent portion 29d is formed.

Further, it is cut at the opening side at a position different from that of the bent portion 29d on the cylindrical side surface, spreads outward in the direction of the opening, and is bent inward at the opening end peripheral edge 29e in an L-shaped cross section. A side cutout portion 29g having a claw portion 29f is formed. The inner diameter dimension of the cap member 29 is larger than the diameter of the outer peripheral small diameter portion 21f of the bearing housing 21, and the outer diameter dimension of the opening end peripheral edge 29e of the side surface cutout portion 29g is slightly larger than the diameter of the central hole 5a of the stator core 5. Further, the inner diameter of the claw portion 29f is formed larger than the diameter of the peripheral wall 21i which is the bottom of the concave peripheral groove 21g of the bearing housing 21.

The cap member 29 thus constructed
When the oil packing 8 is attached to the opening 21e of the bearing housing 21, the side cutout portion 29g of the cap member 29 is pressed against the peripheral wall of the central hole 5a of the stator core 5, and the claw portion 29f thereof is recessed in the bearing housing 1. It is fitted into the circumferential groove 21g. Further, the tip of the bent portion 29d of the cap member 29 has the outer peripheral large-diameter portion step portion 2 of the bearing housing 21.
The vicinity 5b of the peripheral edge of the central hole 5a of the stator core 5 fitted up to 1b is pressed.

As described above, the cap member 29 is firmly fixed to the bearing housing 21 while firmly sandwiching the oil packing 8, and at the same time, the stator core 5 is firmly fixed to the bearing housing 21 by the cap member 29. . In addition, the concave circumferential groove 21g of the bearing housing 21
May be formed entirely around the outer peripheral small diameter portion 21f, but may be formed in a part with a width in which the claw portion 29f can be fitted.

FIG. 8 is a cross-sectional view of a main part of a stator support mechanism showing a third embodiment of the present invention. 9 is a perspective view showing details of the cap member according to FIG. The configuration of FIG. 8 is basically the same as the configuration of FIG. 1, except that a concave circumferential groove 31g is formed in the outer peripheral small diameter portion 31f of the bearing housing 31.

The cap member 39 is, as shown in FIG.
A cup-shaped member made of an elastic member made of metal or resin, which extends toward the outer side of the opening on the side surface of the cylinder, and is cut and raised to a position where its tip draws a circle larger than the diameter of the central hole 5a of the stator core 5. Bent part 39d
have.

Further, on the side surface of the cylinder, there are provided a flange portion 39e whose opening side is cut at a position different from that of the bent portion 39d, and a claw portion 39f which is notched on the side opposite to the opening portion of the side surface of the cylinder and bent inward. Has been formed. The cap member 3
The inner diameter of 9 is the outer peripheral small diameter portion 31f of the bearing housing 31.
And the outer diameter of the flange portion 39e is slightly larger than the diameter of the central hole 5a of the stator core 5. The diameter dimension drawn by the tip of the claw portion 39f is the peripheral wall 31i which is the bottom of the concave peripheral groove 31g of the bearing housing 31.
Is formed to be larger than the diameter dimension of.

The cap member 39 thus constructed
Is attached to the opening 31e of the bearing housing 31 with the oil packing 8 sandwiched therebetween, the flange portion 39e of the cap member 39 is pressed against the inner wall of the central hole 5a of the stator core 5, and the claw portion 39f of the flange portion 39f has a concave periphery of the bearing housing 31. It is fitted in the groove 31g. Further, the tip of the bent portion 39d of the cap member 39 has the outer peripheral large diameter step portion 3 of the bearing housing 31.
The vicinity 5b of the peripheral edge of the central hole 5a of the stator core 5 fitted up to 1b is pressed.

As described above, the cap member 39 firmly holds the oil packing 8 and holds the bearing housing 31.
At the same time, the stator core 5 is firmly fixed to the bearing housing 31 by the cap member 39. The concave circumferential groove 31g of the bearing housing 31 may be formed entirely around the outer peripheral small diameter portion 31f, or may be partially formed with a width that allows the claw portion 39f to be fitted therein.

[0036]

As described above, according to the first aspect of the invention, the bearing for supporting the rotating shaft of the rotor is held in the inner peripheral portion, and the cap member for preventing the leakage of the lubricating fluid is provided in the opening. In a stator supporting mechanism for a motor, which comprises a bearing housing to which a stator core is inserted and fixed and a coil is wound around the outer periphery, a receiving portion provided on a part of the outer periphery of the opening of the bearing housing and a side surface of the cap portion. The cap member can provide a strong and highly reliable fixation to the outer periphery of the bearing housing on the opening side by providing the retaining member including the locking portion that engages with the receiving portion.

According to the invention described in claim 2,
According to the invention described in claim 3, according to the invention described in claim 3, the cap of the retaining means is provided with a cap pressing portion which is pressed in the radial direction from the stator core. By providing the stator pressing portion that presses in the axial direction, the cap member can firmly fix the opening side outer periphery of the bearing housing and the stator core to the bearing housing.

According to the invention as set forth in claim 4, the receiving portion is a protrusion provided in the vicinity of the outer peripheral edge of the bearing housing on the opening side, and the locking portion is provided on the cap portion. According to the invention described in claim 5, the cap portion is formed of an elastic portion and has a window portion fitted into the protrusion as the locking portion. The cap portion is pressed in the radial direction from the stator. According to the invention described in claim 6, the cap pressing part is a flange part that is pressed against the peripheral wall of the central hole of the stator core and that fits the window part into the protrusion. Can be provided by

Further, according to the invention described in claim 7, the receiving portion is a concave circumferential groove provided on the outer periphery of the bearing housing on the opening side, and the locking portion is provided on the cap portion. According to the invention described in claim 8, the cylindrical side surface portion of the cap portion is formed of an elastic portion, and has a claw portion having an L-shaped cross section that is fitted into the concave circumferential groove as the locking portion. According to the invention described in claim 9, the cap pressing portion is pressed in the radial direction from the stator, and the cylindrical side surface portion is pressed by the peripheral wall of the central hole of the stator core so that the claw portion becomes the concave circumferential groove. It can be provided by cutting the opening to be fitted.

Further, according to the invention described in claim 10, the receiving portion is a concave circumferential groove provided on the outer circumference of the opening of the bearing housing, and the locking portion is provided on the cap portion. A cap part comprising an elastic part and having a cut-and-raised claw that is cut inward and is bent inward from the upper surface side that is fitted into the concave circumferential groove as the locking part, and the cap part is defined in claim 11. According to the invention, there is provided a cap pressing portion that is pressed in the radial direction from the stator, and according to the invention described in claim 12, the cap pressing portion is pressed against the peripheral wall of the central hole of the stator core and the cut and raised portions are formed. It can be provided by forming a claw as a flange portion to be fitted into the concave circumferential groove.

According to the invention described in claim 13, the method for manufacturing the stator support mechanism of the motor is provided with the retaining means according to any one of claims 1 to 3, and the bearing housing is fixed to the stator base. The bearing is press-fitted at a predetermined position on the inner peripheral portion of the bearing housing, filled with a lubricating fluid, the cap member is inserted into the opening of the bearing housing, and the coil of the stator core is wound. The central hole can be provided by fitting it into the retaining member of the cap member and fitting it into the outer peripheral portion of the bearing housing.

Further, the stator core fixed by closing the cap retaining means with a dedicated jig can be easily detached from the bearing housing, and the model can be changed and the parts can be reused.

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts of a stator support mechanism showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a bearing housing in FIG.

FIG. 3 is a perspective view showing a cap member in FIG.

FIG. 4 is an explanatory diagram illustrating the procedure of FIG. 1.

5 is a cross-sectional view of essential parts showing the structure of a motor including the stator support mechanism of FIG.

FIG. 6 is a cross-sectional view of a main part of a stator support mechanism showing a second embodiment of the present invention.

7 is a perspective view showing a cap member in FIG.

FIG. 8 is a cross-sectional view of essential parts of a stator support mechanism showing a third embodiment of the present invention.

9 is a perspective view showing a cap member in FIG.

[Explanation of symbols]

1 Bearing housing 2 Stator base 3 circuit board 4 coils 5 Stator core 6 bearings 7 rotation axis 8 oil packing 9 Cap member 10 oil

Claims (13)

[Claims] 1. A cap member for holding a bearing for supporting a rotating shaft of a rotor at an inner peripheral portion of an inner peripheral portion, an opening portion and an outer peripheral portion of a bearing housing and preventing leakage of a lubricating fluid at the opening portion. In a stator support mechanism for a motor, in which a stator core with a coil wound around it is fixed to the receiving part provided on a part of the outer circumference on the opening side of the bearing housing, and on the side surface of the cap part. A stator support mechanism for a motor, characterized in that the motor stator support mechanism is provided with a retaining portion that is configured to include a locking portion that engages with the receiving portion. 2. The stator supporting mechanism for a motor according to claim 1, wherein the locking portion is provided with a cap pressing portion which is pressed in the radial direction from the stator core. 3. The stator supporting mechanism for a motor according to claim 1, wherein the engaging portion is provided with a stator pressing portion that axially presses the stator core. 4. The receiving portion is a protrusion provided in the vicinity of an outer peripheral edge of the bearing housing on the opening side, and the locking portion is an elastic portion provided in the cap portion, and serves as the locking portion. The stator supporting mechanism of the motor according to claim 1, wherein the cap portion has a window portion fitted into the protrusion. 5. The stator supporting mechanism for a motor according to claim 4, wherein the cap portion includes a cap pressing portion that is pressed in the radial direction from the stator. 6. The stator supporting mechanism for a motor according to claim 5, wherein the cap pressing portion has a flange portion that is pressed against the peripheral wall of the central hole of the stator core to fit the window portion into the protrusion. 7. The receiving portion is a concave circumferential groove provided on the outer periphery of the bearing housing on the opening side, and the locking portion is an elastic portion provided in the cap portion, and the locking portion serves as the locking portion. The stator supporting mechanism for a motor according to claim 1, wherein the cap portion has a claw portion having an L-shaped cross section that is fitted into the concave circumferential groove. 8. The stator supporting mechanism for a motor according to claim 7, wherein the cylindrical side surface portion of the cap portion is a cap pressing portion that is pressed in the radial direction from the stator core. 9. The stator supporting mechanism for a motor according to claim 8, wherein the cylindrical side surface portion is pressed by a peripheral wall of a central hole of the stator core and an opening portion for inserting the claw portion into the concave circumferential groove is cut. 10. The receiving portion is a concave circumferential groove provided on the outer periphery of the bearing housing on the opening side, and the locking portion is an elastic portion provided in the cap portion, and the locking portion serves as the locking portion. 2. The stator support mechanism for a motor according to claim 1, wherein the upper surface side to be fitted into the concave circumferential groove is a cap portion having a cut-and-raised claw that is cut off and bent inward. 11. The stator supporting mechanism for a motor according to claim 10, wherein the cap portion includes a cap pressing portion that is pressed in the radial direction from the stator core. 12. The stator supporting mechanism for a motor according to claim 11, wherein the cap pressing portion has a flange portion that is pressed against a peripheral wall of a central hole of the stator core and that fits the cut-and-raised claws into the concave circumferential groove. . 13. A retaining means according to any one of claims 1 to 3 is prepared, the bearing housing is fixed to a stator base, and the bearing is press-fitted into a predetermined position of an inner peripheral portion of the bearing housing, and then lubricated. It is filled with fluid, the cap member is inserted into the opening of the bearing housing, and the central hole of the stator core around which the coil is wound is fitted into the retaining means of the cap member and the outer peripheral portion of the bearing housing. A method for manufacturing a stator support mechanism for a motor that is fitted therein.