KR100672600B1 - Washing machine - Google Patents

Abstract

In order to efficiently mount the dual rotor type motor in the washing machine, the present invention includes a tub for storing the wash water; A double rotor including an outer rotor on which an outer magnet is supported on an inner circumferential surface, and an inner rotor provided on an inner side of the outer rotor to support an inner magnet on an outer circumferential surface; A bearing housing provided at the rear of the tub and supporting a rotating shaft connected to the dual rotor, and a bearing extending from the support; And it provides a washing machine comprising a stator including a core having both sides opposed to the outer magnet and the inner magnet, respectively, a coil wound on the outer surface of the core, and a fixing part fixed to the fastening portion.

Washing machine, double rotor, motor, stator

Description

Washing machine

1 is a cross-sectional view of a washing machine according to the prior art.

2 is a cross-sectional view showing a mounting structure of a double rotor type motor according to an embodiment of the present invention.

Figure 3 is an exploded perspective view of a double rotor type motor according to an embodiment of the present invention.

Figure 4 is a partially cut perspective view of the tub rear portion according to an embodiment of the present invention.

5 is a perspective view of a bearing housing according to an embodiment of the present invention.

6 is a cross-sectional view showing a mounting structure of a double rotor type motor according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

2: Tub 3: Drums

10: outer rotor 20: inner rotor

30: stator 70: bearing housing

80 cover part

The present invention relates to a washing machine, and more particularly to a washing machine equipped with a double rotor type motor.

In general, the washing machine washes using a friction force between the wash water and the laundry in the drum rotated by the driving force of the motor while the detergent, the wash water, and the laundry are put in the drum. Here, the drum refers to a washing tank that is widely accommodated in the wash water and laundry, it is a configuration that is applied to both washing machines irrespective of the drum method or pulsator method.

Meanwhile, according to the driving method of the washing machine, an indirect connection method in which the driving force of the motor is indirectly transmitted to the drum through a belt wound around the motor pulley and the drum pulley, and a direct connection in which the driving force is directly transmitted to the motor immediately after the motor is directly connected to the drum Divided into expressions.

Here, the indirect connection method in which the driving force of the motor is not directly transmitted to the drum but through the belt wound around the motor pulley and the drum pulley causes energy loss in the driving force transmission process, and generates a lot of noise in the power transmission process. Therefore, in order to solve these problems, the use of a washing machine employing a direct type motor is increasing.

1 is a cross-sectional view showing the structure of a drum washing machine and its motor according to the prior art.

As shown in Figure 1, a tub (2) (Tub) is installed inside the cabinet (1), the drum (3) is installed in the center inside the tub (2) rotatably.

In addition, a motor including a stator 6 and a rotor 5 is installed at the rear side of the tub 2, and the stator 6 is fixed to the rear wall of the tub, and the rotor 5 is the stator 6. It is connected to the drum 3 by a rotating shaft 4 penetrating the tub while wrapping. Although not shown in detail in the drawing, magnetics are alternately arranged with opposite polarities on the inner circumferential surface of the rotor 5.

Meanwhile, a door 21 is installed in front of the cabinet 1, and a gasket 22 is installed between the door 21 and the tub 2. In addition, a hanging spring 23 for supporting the tub 2 is installed between the inside of the upper surface of the cabinet 1 and the upper side of the outer peripheral surface of the tub 2, and the inside of the lower surface of the cabinet 1 and the tub. (2) A friction damper 24 is provided between the lower side of the outer circumferential surface to damp the vibration of the tub 2 generated during dehydration.

In addition, between the tub rear wall and the stator is substantially the same shape as the outer shape of the rear wall portion of the tub (2) is fixed to the tub rear wall when the stator is fastened to support the load of the stator and the concentricity of the stator There is a metal tub supporter (not shown) for holding the ().

When power is supplied to the stator 6, the stator functions as an electromagnet. At this time, the rotor 5 is rotated by a magnetic field formed between the stator 6 and the magnets provided in the rotor 5, and the rotational force of the rotor 5 is transmitted to the drum through the rotation shaft 4. .

However, in recent years, as the capacity of a washing machine increases, the output of the motor for rotating the drum must also increase. Thus, in order to increase the output of the motor, the size of the rotor and the stator must be increased, and thus the size and weight of the motor There was a problem that is greatly increased.

In order to solve the above problem, the present applicant winds coils inside and outside of the stator in Korean Patent Publication No. 2001-0097204 (filed November 08, 2001), and a predetermined gap is formed inside and outside of the stator. In addition, the dual rotor type motor that can increase the output by constructing the inner rotor and the outer rotor in dual is proposed.

The double rotor-type motor needs to be more firmly mounted to a washing machine or the like as it generates a high output. Accordingly, the present invention is further embodied by further improving the structure for mounting the double rotor type motor to a washing machine.

It is an object of the present invention to provide a washing machine having an improved structure of a dual rotor type motor.

In order to achieve the above object, the present invention is a tub for storing the wash water; A double rotor including an outer rotor on which an outer magnet is supported on an inner circumferential surface, and an inner rotor provided on an inner side of the outer rotor to support an inner magnet on an outer circumferential surface; A bearing housing provided at the rear of the tub and supporting a rotating shaft connected to the dual rotor, and a bearing extending from the support; A cover part integrally inserted with the tub to cover an outer surface of the bearing housing; And a core having both surfaces opposed to the outer magnet and the inner magnet, respectively, a coil wound on the outer surface of the core, and a mold part formed by insert molding on the outer surface of the core and the coil so as to be exposed to both surfaces of the core. It provides a washing machine comprising a stator extending from the mold and including a fixing part fixed to the fastening part.

Here, the fastening portion extends in the radial direction of the bearing housing. The fastening part is provided in plural at intervals of a predetermined angle along the circumferential direction of the bearing housing. The fixing part is insert molded to be integral with the mold part. The fixing portion extends radially inward from the mold portion or radially outwardly from the mold portion. At least one fastening hole is formed in the fastening part and the fixing part to fasten the fastening member at positions corresponding to each other. The fastening portion protrudes to a predetermined height.

It further comprises a positioning unit for determining the fixed position of the fixed portion relative to the fastening portion. Here, the positioning unit includes at least one positioning protrusion protruding on one side of the fastening portion and the fixing portion, and at least one positioning groove formed on the other side facing the positioning protrusion correspondingly. It is done by The positioning projection has a constant diameter body portion, and a guide portion formed to reduce the diameter at the end of the body portion. The positioning groove includes a cylindrical portion having a constant diameter corresponding to the body portion, and a reducing portion formed at an end of the cylindrical portion corresponding to the guide portion. The positioning groove has a diameter smaller than the diameter of the fastening hole formed in the fixing portion.

The bearing housing is formed with a fixing groove in which a mold is filled and fixed when insert molding the cover part. The fixing part is provided with a reinforcing part for reinforcing strength. The reinforcement part includes a plurality of reinforcement ribs integrally formed on an outer surface of the fixing part. The cover part is integrally formed with a plurality of reinforcing ribs for reinforcing strength. An insulator made of an insulating resin material is provided between the core and the mold part.

On the other hand, in order to achieve the above object, the present invention the tub for storing the wash water; A double rotor including an outer rotor on which an outer magnet is supported on an inner circumferential surface, and an inner rotor provided on an inner side of the outer rotor to support an inner magnet on an outer circumferential surface; A bearing housing provided at the rear of the tub and supporting a rotating shaft connected to the double rotor, and a bearing part extending radially from the support part; A cover part integrally insert-molded with the tub to cover and fix the outer surface of the bearing housing and having a plurality of reinforcing ribs for reinforcing strength; And a core having both surfaces opposed to the outer magnet and the inner magnet, an insulator made of an insulating resin material provided on an outer surface of the core, a coil wound around the outer surface of the insulator, and exposed to both sides of the core. The present invention provides a washing machine including a stator including an injection molded part integrally formed on an outer surface of a core and a coil, and a fixing part integrally extending radially from the mold part and fixed to the fastening part.

On the other hand, in order to achieve the above object, the present invention the tub for storing the wash water; A double rotor including an outer rotor having an outer magnet supported on an inner circumferential surface thereof, and an inner rotor provided inside the outer rotor and supporting an inner magnet on an outer circumferential surface thereof; A bearing housing provided at the rear of the tub and supporting a rotating shaft connected to the double rotor, and a bearing part extending radially from the support part; A cover part integrally insert-molded with the tub to cover and fix the outer surface of the bearing housing and having a plurality of reinforcing ribs for reinforcing strength; And both sides of the core provided to face the outer magnet and the inner magnet, respectively, an insulator made of an insulating resin material provided on an outer surface of the core, a coil wound around the outer surface of the insulator, and radially extending from the insulator. It provides a washing machine comprising a stator including a fixing part fixed to the fastening part.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, FIGS. 2 to 6.

2 is a cross-sectional view showing a mounting structure of a double rotor type motor according to an embodiment of the present invention, Figure 3 is an exploded perspective view of a double rotor type motor according to an embodiment of the present invention.

As shown in FIGS. 2 and 3, the dual rotor type motor includes an outer rotor 10, an inner rotor 20, and a stator 30. The stator 30 is inserted between the outer rotor 10 and the inner rotor 20, and an upper portion of the stator 30 is fixed to the rear of the washing machine tub.

In detail, the upper part of the stator 30 is fixed to one side of the bearing housing B mounted at the rear of the stator, and the lower part is inserted between the outer rotor 10 and the inner rotor 20. At this time, the outer circumferential surface and the inner circumferential surface of the stator 30 are installed to maintain a predetermined gap with the inner circumferential surface of the outer rotor and the outer circumferential surface of the inner rotor, respectively. Here, one side of the stator 30 is provided with a hall sensor (50) for detecting the rotational speed of the double rotor. The sensing unit 51 of the hall sensor 50 is inserted through a hole 38a formed at an upper side of the stator to detect the rotational speed of the double rotor.

The core 31 is exposed to the outside on each of the inner and outer surfaces of the outer magnet 11 provided in the outer rotor 10 and the inner magnet 21 provided in the inner rotor 20. Here, the outer magnet 11 and the inner magnet 21 are made of permanent magnets, and the core 31 preferably functions as an electromagnet.

Therefore, since the magnetic field is formed in duplicate between the inner side of the inner magnet 21 and the core 31 and the outer side of the outer magnet 11 and the core 31, the double rotor has a stronger torque. Can be rotated.

The stator 30 includes a plurality of individual split cores 31, an insulator 32 made of an insulating resin surrounding the split core 31, and a coil 34 wound on an outer surface of the insulator 32. ) And a mold part 33 formed by insert molding on the outer surface of the insulator 32 and the coil 34. Here, if the outer surface of the coil 34 is enamel coated and guaranteed to be electrically insulated, the insulator 32 may not be provided separately.

In addition, the inner circumferential surface of the outer rotor 10 is provided with an inner magnet 11 made of a plurality of permanent magnets in which the N pole and the S pole are alternately arranged along the circumferential direction. In addition, the outer magnet of the inner rotor 20 is provided with an outer magnet made of a plurality of permanent magnets alternately arranged at the north pole and the south pole in the circumferential direction so as to face the inner magnet 21. A portion of the outer rotor 10 and the lower portion of the inner rotor 20 which are in contact with each other is preferably fixed by a caulking hole 23 formed by a press working and caulking operation.

Here, the inner rotor 20 and the outer rotor 10 may be made of an injection molding, but preferably made of a metal material to function as a back yoke.

On the other hand, the mounting structure of the double rotor-type motor made as described above is as follows.

Referring to FIG. 2, a drum 3 or a pulsator rotatably installed in the center of the rear portion of the tub 2 (see FIG. 1) of the washing machine is connected to the rotating shaft 4. Here, the rotary shaft 4 is supported in a rotatable state by a bearing 2b inside the bearing housing 70 installed on the rear surface of the tub 2. In addition, the end of the rotary shaft 4 is coupled to the bushing 40 of the resin material provided in the central portion of the outer rotor 10. The bushing 40 is fixed to the center portion of the outer rotor 10 by fastening means such as bolts 42, but may be integrally formed on the outer rotor 10 in the same manner as insert molding.

Here, a hole in which the rotary shaft 4 is inserted is formed in the center of the bushing 40, and a bushing side serration coupled to a serration part 4a provided on an outer circumferential surface of the rotary shaft 4 on an inner circumferential surface of the hole. The part 41 is formed.

On the other hand, in order to fasten the stator 30 to the bearing housing 70, the stator 30 is preferably provided with a fixing portion 35 extending radially inward from the mold portion 33. Of course, unlike the illustration, the fixing part 35 may be formed to extend radially outward from the mold part 33.

Here, the fixing part 35 is integrally formed by the mold part 33 and the insert molding, and the fixing part 35 has a plurality of fastening holes 35a formed at predetermined angles along the circumferential direction. do. In addition, a fastening hole 2c corresponding to the bearing housing 70 is also formed, and a fastening member such as a bolt 39 is fastened through the fastening holes 35a and 2c to thereby stir the stator 30. It is fixed to the bearing housing 70.

In addition, the outer surface of the fixing part 35 is provided with a reinforcing part for reinforcing strength, the reinforcing part is preferably made of a plurality of reinforcing ribs (35c). In addition, the reinforcing rib 35d may be formed in the inner edge of the point where the mold part 33 and the fixing part 35 meet each other within a range that does not prevent the rotation of the inner rotor 20.

Of course, by forming a ring-shaped reinforcing bracket (not shown) in close contact with the inner or outer surface of the fixing portion 35 without forming the reinforcing rib (35c) as described above of the mold portion 33 It might be possible to increase the strength.

On the other hand, Figure 4 is a partially cutaway perspective view of the back of the washing machine tub is mounted with a double rotor type motor according to an embodiment of the present invention, Figure 5 is a perspective view of a bearing housing according to an embodiment of the present invention.

As shown in FIG. 4, the cover part 80 is provided on the outer surface of the bearing housing 70 made of aluminum alloy, and the cover part 80 is formed by insert molding integrally with the tub 2. desirable. That is, the tub 2 and the cover part 80 are simultaneously formed by insert molding in the state in which the bearing housing 70 is located at one side.

As shown in FIG. 5, the fastening portion 70b extends radially on the outer circumferential surface of the support portion 70a of the bearing housing 70, and the fastening portion 70b has a shape protruding a predetermined height. When the cover part (80 of FIG. 4) is formed by insert molding on the upper side of the bearing housing 70, only the fastening hole 2c formed in the fastening part 70b is exposed.

Through this, the bearing housing 70 is firmly fixed to the rear of the tub 2 by the cover portion 80, and at the same time can reinforce the strength of the rear of the tub (2). Therefore, since the cover part 80 is formed at the same time when insert molding for manufacturing the tub 2, there is no need to assemble a separate member for fixing the bearing housing 70, thereby increasing productivity. Can be.

On the other hand, the cover portion 80 is formed with a plurality of ribs 81 to reinforce the strength, the ribs 81 are formed with a plurality of predetermined intervals along the circumferential direction and the radial direction of the back of the tub (2) This is preferable.

As shown in FIG. 5, the bearing housing 70 has a sleeve-shaped support portion 70a supporting the bearing and a radial direction from a rear end portion of the bearing support portion 70a while being integral with the support portion 70a. It includes a fastening portion 70b extended to. On the outer surfaces of the support part 70a and the fastening part 70b, as described above, a cover part (80 in FIG. 4) is integrally inserted and molded into the rear of the tub 2.

Here, the fastening part 70b includes a planar area provided between the stepped area 70b-1 and the stepped area 70b-1 at least once while going outward in the radial direction. In addition, the stepped region 70b-1 preferably has a structure that is bent downward at predetermined distances while going outward in the radial direction.

In addition, a fixing groove 75 is provided around the upper end of the bearing housing 70 to improve coupling force with the cover 80 when insert molding. When the cover portion 80 is formed by insert molding, the fixing groove 75 is filled with a fixed mold. Thus, the bearing housing 70 is firmly fixed to the cover part 80.

Here, a hole in which the rotating shaft is inserted is formed in the central portion of the support part 70a, and the fastening part 70b extends radially outward from the support part 70a. E In addition, it is preferable that the fastening portion 70b is formed in a plurality of radially integrally extending at a predetermined angle along the circumferential direction of the support portion 70a.

In addition, the fastening part 70b protrudes with a predetermined thickness, which is to reinforce the strength of the bearing housing 70 and to be fastened to the fixing part 35 provided in the state 30.

As described above, the fastening hole 2c is formed in the fastening part 70b at a position corresponding to the fastening hole formed in the fixing part 70b of the stator 30.

On the other hand, the stator 30 should be coupled with the correct concentricity with respect to the rotation axis (4). To this end, the fixing part 35 and the fastening part 70b are provided with a positioning unit for aligning the concentricity.

As shown in Figs. 2 to 4, the positioning unit includes a positioning protrusion 2d and a positioning groove 35b. Here, the positioning protrusions 2d are formed by protruding a plurality of positioning protrusions 2d at one side of the fastening holes 2c formed in the fastening portion 70b of the bearing housing 70. In addition, the fixing portion 35 is preferably formed with a positioning groove 35b into which the positioning projection 2d is inserted correspondingly. The positioning groove 35b may be formed as a through hole formed to penetrate the fixing part 35.

Of course, contrary to the above, the positioning groove is formed in the fastening portion of the bearing housing 70, the positioning projection may be formed in the fixing portion (35).

The positioning protrusion 2d is formed of a body portion having a constant diameter and a guide portion which is formed in a substantially conical shape at the end of the body portion so that the positioning protrusion can be easily inserted into the positioning groove 35b.

In addition, the positioning groove (35b) is preferably made of almost the same shape and size as the positioning projection (2d) so that the positioning projection (2d) is inserted and fit snugly without shaking.

That is, the positioning groove (35b) is a portion in which the body portion of the positioning projection (2d) is inserted into a cylindrical portion of constant diameter correspondingly, the portion of the guide portion of the end of the positioning projection (2d) is inserted into a conical shape It is desirable to form a reducing portion. In addition, it is preferable that the positioning groove 35b of the fixing part 35 has a diameter smaller than that of the fastening hole 35a.

On the other hand, Figure 6 is a cross-sectional view showing a mounting structure of a double rotor-type motor according to another embodiment of the present invention.

As shown in FIG. 6, in the dual rotor type motor according to the present exemplary embodiment, the mold part 33 is not separately formed in the stator 30, and the fixing part may be fixed from the insulator 32 provided on the outer surface of the core 31. 135) is extended. Here, since the formation structure of the bearing housing 70 and the cover portion 80 mounted to the rear of the tub 2 is the same as the above-described embodiment, description thereof will be omitted. In addition, the configuration of the reinforcing rib and the positioning unit formed in the fixing portion is also the same as the above-described embodiment.

As shown, the fixing portion 135 of the stator 30 coupled with the fastening portion 70b provided in the bearing housing 70 extends radially inward from the insulator 32. Of course, unlike the illustrated, the fixing part may be provided to extend radially outward of the insulator 32.

Here, the fixing part 135 is preferably formed by insert molding integrally with the insulator 32. In addition, the fixing part 135 is provided with a reinforcing rib 135a for reinforcing strength.

As described above, the double rotor-type motor according to the present invention is fastened and fixed to a bearing housing provided at the rear of the tub, and the bearing housing is firmly wrapped around the cover part formed by insert molding integrally with the tub. Can be fixed.

 Washing machine equipped with a double rotor type motor according to the present invention has the following effects.

First, since the bearing housing is fixed by a cover part formed by insert molding integrally with the tub, it is possible to more stably fix the dual rotor type motor providing a high torque torque.

Second, since the bearing housing is covered and fixed by a cover part formed by insert molding integrally with the tub, a process of separately assembling the bearing housing to the rear of the tub may be omitted. Thus, the assembly process can be simplified to shorten the production time of the product.

Third, the fastening portion extending radially from the support of the bearing housing may be coupled to the stator and may reinforce the rear side strength of the tub.

Fourth, the production time of the product can be shortened by shortening the time required for alignment during assembly through the positioning unit provided in the bearing housing and the stator.

As described above, the present invention improves the motor mounting structure of the washing machine, so that the driving force of the motor is directly transmitted to the drum to reduce the noise and failure and to reduce the power loss to improve the washing power to improve product reliability. It is possible to improve, and to improve the manufacturability of the components constituting the drive unit it is possible to improve the productivity during production.

Claims (23)

A tub for storing wash water; A double rotor including an outer rotor on which an outer magnet is supported on an inner circumferential surface, and an inner rotor provided on an inner side of the outer rotor to support an inner magnet on an outer circumferential surface; A bearing housing provided at the rear of the tub and supporting a rotating shaft connected to the dual rotor, and a bearing extending from the support; And And a stator including a core having both surfaces opposed to the outer magnet and the inner magnet, a coil wound on an outer surface of the core, and a fixing part fixed to the fastening part. The method of claim 1, Washing machine, characterized in that the fastening portion extends in the radial direction of the bearing housing. The method of claim 1, The fastening part is provided with a plurality of fasteners having a predetermined angle intervals along the circumferential direction of the bearing housing. The method of claim 1, The stator includes a mold part which is formed by insert molding on the outer surface of the core and the coil so that both sides of the core are exposed, The fixing part is an insert molded, characterized in that made in one piece with the mold. The method of claim 4, wherein And the fixing part extends radially inward from the mold part. The method of claim 4, wherein And the fixing part extends radially outward from the mold part. The method of claim 1, Washing machine, characterized in that the fastening portion and the fixing portion is formed with at least one fastening hole for fastening the fastening member in the corresponding position. The method of claim 1, Washing machine, characterized in that the fastening portion protrudes to a predetermined height. The method of claim 1, Washing machine characterized in that it further comprises a positioning unit for determining the fixed position of the fixing portion to the fastening portion. The method of claim 9, wherein the positioning unit, At least one positioning protrusion protruding from one side of the fastening part and the fixing part; Washing machine characterized in that it comprises at least one positioning groove formed on the other side facing the positioning projection to be correspondingly inserted. The method of claim 10, The positioning projection is a washing machine, characterized in that consisting of a constant diameter portion and a guide portion formed to reduce the diameter at the end of the body portion. The method of claim 11, And said positioning groove comprises a cylindrical portion having a constant diameter corresponding to said body portion, and a reducing portion formed at the end of said cylindrical portion corresponding to said guide portion. The method of claim 10, And the positioning groove has a diameter smaller than the diameter of the fastening hole formed in the fixing portion. The method according to any one of claims 1 to 13, And the bearing housing is insert molded and integrally formed with the tub. The method of claim 14, And a cover part integrally inserted with the tub to cover an outer surface of the bearing housing. The method of claim 15, Washing machine, characterized in that the bearing housing is formed with a fixing groove which is fixed to the mold is filled in the insert molding the cover part. The method of claim 15, Washing machine, characterized in that the cover portion is formed integrally with a plurality of reinforcing ribs for reinforcing strength. The method of claim 1, Washing machine, characterized in that the fixing portion is provided with a reinforcing portion for reinforcing strength. The method of claim 18, The reinforcing part washing machine, characterized in that made of a plurality of reinforcing ribs integrally formed on the outer surface of the fixing part. The method of claim 1, Washing machine, characterized in that the insulating resin is provided between the core and the coil. The method of claim 20, The fixing unit is characterized in that formed in the radially extending from the insulator. A tub for storing wash water; A double rotor including an outer rotor on which an outer magnet is supported on an inner circumferential surface, and an inner rotor provided on an inner side of the outer rotor to support an inner magnet on an outer circumferential surface; A bearing housing provided at the rear of the tub and supporting a rotating shaft connected to the double rotor, and a bearing part extending radially from the support part; A cover part integrally insert-molded with the tub to cover and fix the outer surface of the bearing housing and having a plurality of reinforcing ribs for reinforcing strength; And A core having both surfaces opposed to the outer magnet and the inner magnet respectively, an insulator made of an insulating resin material provided on an outer surface of the core, a coil wound around the outer surface of the insulator, and the core so that both surfaces of the core are exposed. And a stator including an injection molded part integrally formed on an outer surface of the coil and a fixing part integrally extending radially from the mold and fixed to the fastening part. A tub for storing wash water; A double rotor including an outer rotor on which an outer magnet is supported on an inner circumferential surface, and an inner rotor provided on an inner side of the outer rotor to support an inner magnet on an outer circumferential surface; A bearing housing provided at the rear of the tub and supporting a rotating shaft connected to the double rotor, and a bearing part extending radially from the support part; A cover part integrally insert-molded with the tub to cover and fix the outer surface of the bearing housing and having a plurality of reinforcing ribs for reinforcing strength; And A core having both surfaces opposed to the outer magnet and the inner magnet, an insulator made of an insulating resin material provided on an outer surface of the core, a coil wound around the outer surface of the insulator, and radially extending from the insulator; Washing machine comprising a stator including a fixing part fixed to the fastening part.

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