KR20060085413A - Double rotor type motor - Google Patents

Abstract

The present invention provides an outer rotor including a first base portion having an open portion at a center thereof, and a first extension portion extending from an edge of the first base portion in a direction substantially perpendicular to the first base portion and having an outer magnet installed on an inner circumferential surface thereof. ; An inner side having a second base portion coupled to an upper surface of the first base portion, and a second extending portion extending from the edge of the second base portion to face the inner side of the first extension portion with a predetermined interval and having an inner magnet installed on an outer circumferential surface thereof; Rotor; And it is provided on the edge of the opening portion of the first base, and provides a dual rotor type motor including a bushing is inserted and supported by the rotating shaft.

Washing Machine, Double Rotor, Insert Molding, Bushing

Description

Double rotor type motor

1 is a cross-sectional view showing a mounting structure of a motor according to the prior art.

Figure 2 is an enlarged cross-sectional view of the motor according to the prior art.

3 is a cross-sectional view of a double rotor type motor according to the present invention.

4 is an exploded perspective view of the double rotor type motor.

5 is a cross-sectional view of the double rotor according to the first embodiment of the present invention.

6 is a cross-sectional view of a double rotor according to a second embodiment of the present invention.

7 is a sectional view of a double rotor according to a third embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

B: bearing housing 30: stator

10,110,210: Outer rotor 20,120,220: Inner rotor

40,44,144,244: Bushing

The present invention relates to a motor, and more particularly, to a double rotor type motor suitable for application to a washing machine or the like.

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 and 2 are cross-sectional views showing the structure of a drum washing machine and a motor thereof 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) through the tub while wrapping. Although not shown in detail in the drawing, magnetic bodies are alternately arranged with opposite polarities on the inner circumferential surface of the rotor 5.

In addition, between the tub rear wall and the stator is substantially the same as the outer shape of the rear wall 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 It is preferable that a metal tub supporter (not shown) interposed therebetween is maintained.

Meanwhile, a door 7 is installed in front of the cabinet 1, and a gasket 8 is installed between the door 7 and the tub 2.

In addition, a hanging spring 9a 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 9b for damping the vibration of the tub 2 generated during dehydration is provided between the lower side of the outer peripheral surface.

On the other hand, Figure 2 is an enlarged cross-sectional view of the motor, the existing stator (6) is mounted to a bearing housing (B) fixed to the rear of the tub (2), the rotor (5) on the outside of the stator (6) It is rotatably mounted. One end of the rotating shaft 4 is fixed to the central portion of the rotor 5, and the other end of the rotating shaft 4 is connected to the drum 3 and the like. Here, the permanent magnet 5a is installed on the inner circumferential surface of the rotor 5, and the stator 6 is wound around the core and a coil supplied with power to the outer circumferential surface of the core to function as an electromagnet.

Therefore, when power is supplied to the coil, the rotor 5 is rotated by the action of the rotating magnetic field formed between the permanent magnet and the electromagnet, the rotational torque of the rotor 5 through the rotating shaft (4) (3) It is delivered.

In addition, in order to cool the heat generated during operation of the motor, a hole 5b through which outside air passes is formed in the lower frame of the conventional rotor.

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, a motor that can increase the power by constructing the inner rotor and the outer rotor in a double manner has been proposed.

Accordingly, the present invention further embodied by further improving the motor, and provides a double rotor type motor having various structures.

It is an object of the present invention to provide a double rotor type motor having a more improved structure.

In order to achieve the above object, the first embodiment of the present invention includes a first base portion having an open portion in the center and an outer peripheral surface extending in a direction substantially perpendicular to the first base portion from an edge of the first base portion. An outer rotor having a first extension portion on which a magnet is installed; An inner side having a second base portion coupled to an upper surface of the first base portion, and a second extending portion extending from the edge of the second base portion to face the inner side of the first extension portion with a predetermined interval and having an inner magnet installed on an outer circumferential surface thereof; Rotor; And it is provided on the edge of the opening portion of the first base, and provides a dual rotor type motor including a bushing is inserted and supported by the rotating shaft.

Here, it is preferable that the bushing is formed by insert molding on the edge of the opening. Opening edges of the outer rotor are formed with a fixing hole in which the mold forming the bushing is filled and fixed during insert molding. Here, the outer rotor and the inner rotor is preferably made of a metal material.

The contact portion of the first base portion and the second base portion is fixed by the caulking hole portion. In addition, the first base portion may be formed with a plurality of strength reinforcement embossing at predetermined angle intervals along the circumferential direction, and the portion where the embossing and the second base portion contact may be coupled by a caulking hole portion.

Preferably, the diameter of the opened portion of the first base portion is larger than the diameter of the opening portion.

A support portion for supporting the inner magnet protrudes from the outer circumferential surface of the second extension portion. The through hole is formed in the lower portion of the support. The edge of the opening portion in which the bushing is provided is formed to be convex upward.

On the other hand, in order to achieve the above object, the second embodiment of the present invention is the first base portion with a central opening, and extending from the edge of the first base portion in a direction substantially perpendicular to the first base portion on the inner peripheral surface An outer rotor having a first extension portion on which an outer magnet is installed; A second base portion having a center formed at an open portion and coupled to an upper surface of the first base portion, and extending from the edge of the second base portion to face the inner side of the first extension portion with a predetermined distance therebetween, and having an inner magnet installed on an outer circumferential surface thereof; An inner rotor having two extensions; And it is provided on the edge of the opening portion of the second base, and provides a double rotor-type motor comprising a bushing is inserted and supported by the rotating shaft.

Here, it is preferable that the bushing is formed by insert molding on the edge of the opening. Opening edges of the outer rotor are formed with a fixing hole in which the mold forming the bushing is filled and fixed during insert molding. Here, the outer rotor and the inner rotor is preferably made of a metal material.

The contact portion of the first base portion and the second base portion is fixed by the caulking hole portion. In addition, the first base portion may be formed with a plurality of strength reinforcement embossing at predetermined angle intervals along the circumferential direction, and the portion where the embossing and the second base portion contact may be coupled by a caulking hole portion.

A support portion for supporting the inner magnet protrudes from the outer circumferential surface of the second extension portion. The through hole is formed in the lower portion of the support. The edge of the opening portion in which the bushing is provided is formed to be convex upward.

On the other hand, in order to achieve the above object, the third embodiment of the present invention is the inner base surface extending in a direction substantially perpendicular to the first base portion from the edge of the first base portion and the first base portion is formed in the center An outer rotor having a first lead part on which an outer magnet is installed; The second base portion is formed in the center and is provided on the upper surface of the first base portion, and the inner magnet extending on the outer circumferential surface is extended so as to face with a predetermined interval from the edge of the second base portion to the inside of the first extension portion; An inner rotor having two extensions; And insert molding is formed at the edge of the inner rotor and the opening of the outer rotor at the same time to provide a dual rotor type motor including a bushing in which a rotating shaft is inserted and supported.

Hereinafter, a double rotor type motor according to the present invention will be described in detail with reference to FIGS. 3 to 9 as follows.

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 cross-sectional view of a double rotor type motor according to an embodiment of the present invention.

As shown in FIG. 3, the dual rotor type motor includes an inner rotor 20, an outer rotor 10, 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 a bearing housing provided at the rear of the washing machine tub. In addition, one side of the stator 30 is provided with a hall sensor (70) for detecting 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, the core 31 is preferably made of 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.

On the other hand, in a motor having a permanent magnet generally, the magnetoresistance is not constant according to the distance rotated in the circumferential direction due to the divided core 31 structure of the stator 30. Therefore, cogging torque is generated because the magnetic field formed between the permanent magnet and the electromagnet rotates at a predetermined angle. The cogging torque causes a change in speed and noise during the actual operation of the motor, thereby degrading the performance of the motor.

In order to solve the problem, it is preferable that the exposed surfaces of the permanent magnets constituting the outer magnet 11 and the inner magnet 21 are formed in a convex round shape at the center thereof. This is to minimize the cogging torque by reducing the change in the rotating magnetic field by forming a thick thickness of the central portion of the permanent magnet weakening the magnetic field.

As shown in FIG. 4, the rotating shaft 4 connected to the drum of the washing machine is supported in a rotatable state by a bearing inside the bearing housing B installed at the rear of the tub (see 2 in FIG. 1), and the bearing In the housing B, a dual rotor type motor is installed to drive the rotary shaft 4. Here, the end of the rotary shaft 4 is inserted and supported by a bushing 40 fastened to the center portion of the outer rotor 10.

Here, the upper portion of the stator 30 is fixed to the bearing housing (B), the lower portion 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.

In detail, the stator 30 includes a plurality of divided cores 31, an insulator 32 made of an insulating resin surrounding the divided cores 31, and a coil wound around the outer surface of the insulator 32. And a support part 35c for supporting the insulator 32 and the coil 34.

In addition, the outer rotor 10 has a first base portion 14 having an open portion at the center thereof, and extends in a direction substantially perpendicular to the first base portion 14 from the edge of the first base portion to the outer peripheral surface. The first extension part 15 to which the magnet 11 is provided is provided. Here, the outer magnet 11 is composed of a plurality of permanent magnets in which the N pole and the S pole are alternately arranged along the circumferential direction of the first extension part 15.

In addition, the inner rotor 20 has a second base portion 24 coupled to an upper surface of the first base portion 14, and an inner side of the first extension portion 15 at the edge of the second base portion 24. It is provided with a second extension portion 25 is extended so as to face with a predetermined interval and the inner magnet 21 is installed on the outer peripheral surface. Here, the inner magnet 21 is composed of a plurality of permanent magnets alternately arranged at the N pole and the S pole along the circumferential direction of the second extension part 25.

Here, the inner rotor and the outer rotor 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 contact portion of the first base portion 14 and the second base portion 24 is fixed by the caulking hole 50 formed by the press working and caulking operation.

In detail, when positioned in the press die to form the caulking hole 50, the inner circumferential surface of the inner rotor 20 and the outer circumferential surface of the outer rotor 10 are supported by the alignment equipment and are automatically aligned.

Thereafter, the caulking hole 50 forms a hole 51 penetrating the first base portion 14 and the second base portion 24, and after bending the edge portion of the hole 51 The base parts 14 and 24 are fixed to each other by forming a caulking part 52. That is, the second base part 24 is clamped and fixed between the caulking part 52 formed at the edge of the hole 51 and the upper surface of the first base part 14. At this time, the caulking hole 50 is preferably formed in at least two or more places at intervals of a predetermined angle along the circumferential direction of the base portion (14, 24).

The first base portion 14 and the second base portion 24 may be joined by fastening a fastening member such as a TOX round joint or a bolt instead of the method of forming the caulking hole 13. It may be. The sheet metal pressing is a method of joining the plates by pressing two metal plates, and then placing the grooves on the upper surface of the die for forming the sheet metal pressing.

In addition, before forming the caulking hole 50 or the fixing part by sheet metal compression molding, the first base part 14 at the position where the fixing part is to be formed is embossed to protrude upward to a predetermined depth by pressing. It is preferable that (13) be formed. The embossing 13 is formed to reinforce the strength of the first base portion 14 and is preferably formed in plural at predetermined angle intervals along the circumferential direction of the first base portion 14. After the embossing 13 is formed, a caulking hole 50 or a fixing part by sheet metal pressing is formed at a portion where the embossing 13 and the second base 24 are in contact with each other.

3 and 4, the embossing 13 protrudes upward of the first base portion 14, and the second base portion 24 is loaded on the upper surface of the embossing 13. Therefore, in a region where the embossing 13 is not formed, a predetermined space is formed between the upper surface of the first base 14 and the lower surface of the second base portion 24, and the inner rotor 20 is formed through the space. Inner air flows into the space between the first base portion 14 and the second base portion 24 to cool the heated portion during operation of the motor.

In addition, a plurality of cooling holes 14a are formed at predetermined angle intervals in the circumferential direction in the first base 14 part disposed between the first extension part 15 and the second extension part 25. When the double rotor rotates, air is moved through the cooling hole 14a to cool the motor. Here, the guide member for guiding the movement of air is preferably provided at the edge of the cooling hole (14a).

In addition, it is preferable that at least one through hole 26 is formed at a predetermined angle in a circumferential direction under the portion where the inner magnet 21 is installed in the second extension portion 25. In this case, the through hole 26 communicates a space between the inner rotor 20 and the first extension part 15 and the second extension part 25, and air is supplied through the through hole 26. Cool the heated motor while blowing.

Therefore, the air is circulated through the space formed between the first base portion 14 and the second base portion 24 by the embossing 13, the cooling hole 14a, and the through hole 26. This allows the motor to be cooled more efficiently.

In this case, when the through hole 26 is formed, one side of the second extension part 25 is partially cut by a lancing process or the like, and the support part 27 in which the cut part is bent upwards is It protrudes along the outer peripheral surface of the 2nd extension part 25. As shown in FIG. The support part 27 supports the lower surface of the inner magnet 21 provided on the outer circumferential surface of the second extension part 25.

The inner magnet 21 is attached to the outer circumferential surface of the second extension portion 25 using an adhesive, the inner magnet 21 is detached to the outside by the centrifugal force generated as the double rotor is rotated at a high speed. There is this. In this case, the lower surface of the inner magnet 21 is adhered to the upper surface of the support part 27, thereby increasing the adhesive area, thereby preventing the inner magnet 21 from being separated. In addition, the end of the support 27 may be bent upward to constrain the lower end of the inner magnet 21.

In addition, the upper end of the first extension portion 15 is preferably curled to the outside for strength reinforcement. In addition, the upper end of the second extension portion 25 is curled to the outside for strength reinforcement. Here, since an inner magnet is installed on the outer circumferential surface of the second extension part 25, the width D of the curled upper end is preferably smaller than the thickness of the inner magnet 21.

On the other hand, as shown in Figures 3 and 4, it is preferable that the bushing receiving portion 16 is formed convexly upward on the edge of the opening formed in the first base portion (14). This is to prevent this, because the bushing 44 takes up unnecessary space when protruding to the lower portion of the double rotor.

In the center of the bushing 40, a hole 41 into which a rotating shaft is inserted is formed, and an inner circumferential surface of the hole 41 is formed with a bushing side serration portion 41a coupled with a serration formed on an outer circumferential surface of the rotating shaft. . In addition, as shown in Figure 4, the outer circumferential surface of the bushing 40 is preferably provided with at least one rib 40a to be inclined to reinforce the strength. In addition, the ribs 40a may be formed in plural at predetermined intervals along the circumferential direction of the bushing 40.

Here, the bushing 40 is an opening 12 formed in the center of the outer rotor 10 by a bolt or the like fastened through the holes 45 and 48 formed in the bushing 40 and the bushing receiving portion 16. ) Is fixed to the border.

As described above, in the dual rotor type motor according to the exemplary embodiment of the present invention, the bushing has a structure in which the bushing is fastened to the edge of the opening formed in the center of the outer rotor using a fastening means.

5 is a cross-sectional view illustrating a configuration in which a bushing is provided by insert molding in a double rotor according to a first embodiment of the present invention.

As shown in FIG. 5, instead of the separate bushing being fastened to the outer rotor by the fastening means, the double rotor inserts a bushing 44 formed by insert molding at the edge of the opening formed at the center of the outer rotor 10. Have Here, since the configuration of the double rotor except for the structure of the bushing 44 provided by the insert molding method is the same as described above, description thereof will be omitted.

As shown, the bushing 44 is insert-molded at the edge of the opening formed in the center of the outer rotor 10. That is, the bushing 44 is formed by placing the mold along the opening edge of the outer rotor 10 and then injecting the mold into the mold. Here, the outer rotor 10 and the inner rotor 20 is preferably made of a metal material.

In addition, the bushing 44 is formed of an electrically insulating material, through which the electricity supplied to the stator is leaked to the outside through the outer rotor 10 and the inner rotor 20 made of metal. To prevent the risk of electric shock to the user.

Meanwhile, a fixing hole 14b is formed at the edge of the outer portion of the outer rotor 10 to fill and fix the mold forming the bushing 44 during insert molding. Therefore, the mold injected into the mold is hardened and fixed in the state of filling the upper and lower portions of the open edge and the fixing hole 14b.

Here, when the bushing 44 is formed by insert molding, the alignment between the outer rotor 10 and the bushing 44 is simultaneously performed. That is, when insert molding, the centers of the concentric circles formed by the bushing 44 and the outer rotor 10 are aligned.

When the bushing is separately manufactured and fastened to the edge of the opening, additional time was required for manufacturing the bushing and time alignment between the bushing and the outer rotor, but the bushing was formed by the insert mold method. The bushing can be formed at the correct position more quickly.

6 is a sectional view showing a double rotor according to a second embodiment of the present invention.

As shown in FIG. 6, unlike the first embodiment in which the bushing is provided in the outer rotor, according to the present embodiment, the bushing 144 is provided in the opening formed in the center of the inner rotor 120. Here, the configuration of the double rotor except for the fact that the bushing 144 is provided at the edge of the opening formed in the inner rotor 120 is the same as the first embodiment described above, and will not be described.

Here, the center of the first base portion 114 of the outer rotor 110 is opened, the opening is formed in the center of the second base portion 124 of the inner rotor 120. Here, it is preferable that the bushing 144 is insert molded at the edge of the opening formed in the second base part 124. Here, the inner rotor 120 and the outer rotor 110 are made of a metal material, the bushing 144 is preferably formed of an electrically insulating mold.

In addition, the central portion of the first base portion 114 is opened with a radius larger than the above-described opening portion, through which the material cost of the outer rotor 110 can be reduced.

On the other hand, as described in the first embodiment, it is preferable that the first base portion 114 is formed with an embossing 113 protruding upward. The portion where the embossing 113 is formed and the second base portion 124 are preferably fixed by the formation of the caulking hole 150, the sheet metal pressing molding method, or the fastening of the fastening member. Here, a predetermined space is formed between the upper surface of the first base portion 114 and the lower surface of the second base portion 124 in portions other than the portion where the embossing 113 is formed.

Therefore, unlike the first embodiment described above, the space between the inner rotor 120 and the outer rotor 110 is communicated through the predetermined space and the outside air can be smoothly introduced / discharged. In addition, since the through hole 126 through which air passes is formed in the second extension part 125, air is moved through the predetermined space and the through hole 126 to more effectively radiate the double rotor type motor. Form a structure.

7 is a cross-sectional view showing a double rotor according to a third embodiment of the present invention.

As shown in FIG. 7, openings are formed at the centers of the outer rotor 210 and the inner rotor 220, respectively, and the bushing 244 may be configured to be insert molded at the edges of the openings. Here, the configuration of the double rotor except that the bushing is insert molded at the edges at the same time is the same as in the above-described second embodiment and will not be described.

In detail, the diameter of the open portion formed in the center of the first base portion 214 is preferably formed to be substantially the same as the diameter of the open portion formed in the center of the second base portion 224. In addition, the edges of the openings are provided to be in contact with each other, it is preferable that the bushing 244 is provided by the insert molding at the same time.

Through this, the bushing 244 is formed by insert molding at the aligned position, and the first base part 214 and the second base part 224 are formed by the bushing 244 formed by the insert molding. Even without forming a separate caulking hole 250 may be fixed to each other.

In addition, fixing holes formed at edges of the openings formed in the first base part 214 and the second base part 224 are respectively corresponded to each other so that the mold forming the bushing 244 is filled and fixed during insert molding. Preferably, 214b and 224b are formed, respectively.

Meanwhile, in the embodiments of the dual rotor type motor, the stator has been described as being mounted on the bearing housing B of the washing machine. However, the stator may be attached to the rear side of the tub (see FIG. 1), and the rotation shaft 4 may be attached to other parts. And can be mounted concentrically.

In addition, the dual rotor type motor according to the present invention may be applied to the air conditioner or other device as well as the washing machine in the same or similar manner.

As described above, the double rotor-type motor according to the present invention has the following effects.

First, since a rotor magnetic field is formed between the magnet and the stator provided in the inner rotor and the outer rotor, respectively, a stronger torque can be provided.

Second, since the bushing in which the rotating shaft is inserted and fixed is formed by insert molding in the double rotor, the time required for manufacturing and aligning the bushing can be shortened to improve productivity.

Third, by configuring the bushing in which the rotating shaft is inserted and fixed by using an electrically insulating mold, it is possible to prevent the electricity supplied to the motor from being transmitted through the rotating shaft, thereby preventing the user from being shocked. .

Fourth, when the bushing is coupled to the inner rotor, air flows smoothly through the space between the first base part and the second base part, thereby achieving an efficient cooling structure of the motor.

Claims (23)

An outer rotor having a first base portion having an open portion at a center thereof, and a first extension portion extending from an edge of the first base portion in a direction substantially perpendicular to the first base portion and having an outer magnet installed on an inner circumferential surface thereof; An inner side having a second base portion coupled to an upper surface of the first base portion, and a second extending portion extending from the edge of the second base portion to face the inner side of the first extension portion with a predetermined interval and having an inner magnet installed on an outer circumferential surface thereof; Rotor; And The dual rotor-type motor provided on the edge of the opening portion, comprising a bushing is inserted and supported by the rotating shaft. The method of claim 1, The bushing is a double rotor-type motor, characterized in that the insert molding is provided on the edge of the opening. The method of claim 2, The double rotor-type motor, characterized in that the fixing hole is formed in the outer edge of the outer rotor is filled with the mold forming the bushing when the insert molding. The method of claim 1, The outer rotor and the inner rotor is a dual rotor type motor, characterized in that made of a metal material. The method of claim 1, The contact portion between the first base portion and the second base portion is a double rotor-type motor, characterized in that fixed by the caulking hole. The method of claim 1, Double rotor type motor, characterized in that the first base portion is formed with a plurality of embossing for strength reinforcement with a predetermined angle interval along the circumferential direction. The method of claim 6, The double rotor-type motor, characterized in that the portion where the embossing and the second base portion is in contact with each other by a caulking hole portion. The method of claim 1, Double rotor-type motor, characterized in that the support for supporting the inner magnet protrudes on the outer peripheral surface of the second extension. The method of claim 1, Double rotor-type motor, characterized in that the through hole is formed in the lower portion of the support. The method of claim 1, Double rotor-type motor, characterized in that the edge of the opening portion is provided with the bushing is formed convexly upward. The method of claim 1, The bushing is a double rotor-type motor, characterized in that made of an electrically insulating material. An outer rotor having a first base portion having a center opening and a first extension portion extending from the edge of the first base portion in a direction substantially perpendicular to the first base portion and having an outer magnet installed on an inner circumferential surface thereof; A second base portion having an open portion formed in a center thereof and coupled to an upper surface of the first base portion, and having an inner magnet installed on an outer circumferential surface of the second base portion and extending from the edge of the second base portion to face each other with a predetermined distance; An inner rotor having two extensions; And The double rotor-type motor provided on the edge of the opening portion, comprising a bushing is inserted and supported by the rotating shaft. The method of claim 12, The bushing is a double rotor-type motor, characterized in that the insert molding is provided on the edge of the opening. The method of claim 12, The rotor portion of the opening portion is characterized in that the mold forming the bushing is formed in the fixing hole is filled and fixed when the insert molding. The method of claim 12, The outer rotor and the inner rotor is a dual rotor type motor, characterized in that made of a metal material. The method of claim 12, The diameter of the open portion of the first base portion is a double rotor-type motor, characterized in that formed larger than the diameter of the opening. The method of claim 12, The contact portion between the first base portion and the second base portion is a double rotor-type motor, characterized in that fixed by the caulking hole. The method of claim 12, Double rotor type motor, characterized in that the first base portion is formed with a plurality of embossing for strength reinforcement with a predetermined angle interval along the circumferential direction. The method of claim 18, The double rotor-type motor, characterized in that the portion where the embossing and the second base portion is in contact with each other by a caulking hole portion. The method of claim 12, Double rotor-type motor, characterized in that the support for supporting the inner magnet protrudes on the outer peripheral surface of the second extension. The method of claim 12, Double rotor-type motor, characterized in that the through hole is formed in the lower portion of the support. The method of claim 12, Double rotor-type motor, characterized in that the edge of the opening portion is provided with the bushing is formed convexly upward. An outer rotor having a first base portion having an open portion at a center thereof, and a first extension portion extending from an edge of the first base portion in a direction substantially perpendicular to the first base portion and having an outer magnet installed on an inner circumferential surface thereof; The second base portion is formed in the center and is provided on the upper surface of the first base portion, and the inner magnet extending on the outer circumferential surface is extended so as to face with a predetermined interval from the edge of the second base portion to the inside of the first extension portion; An inner rotor having two extensions; And A dual rotor type motor comprising a bushing which is inserted and molded at the edges of the inner rotor and the opening of the outer rotor at the same time so that the rotating shaft is inserted and supported.

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