KR20060086661A - Double rotor type motor - Google Patents

Abstract

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

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.

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.

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

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

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

Explanation of symbols on the main parts of the drawings

B: bearing housing 30: stator

10,210,310: outer rotor 20,220,320: inner rotor

410: double rotor 40,244,344,444: 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 present invention includes an outer rotor having a first extension portion extending from the edge of the first base portion having an open portion at the center thereof in a direction substantially perpendicular to the first base portion and having an outer magnet installed on an inner circumferential surface thereof; And a second extension portion having an inner magnet installed on an outer circumferential surface of the bushing coupled to the open edge and inserted and supported by a rotating shaft, and extending from the bushing so as to face each other with a predetermined distance inside the first extension portion. Provided is a dual rotor type motor including an inner rotor provided integrally.

Here, the support portion for supporting the upper and lower surfaces of the inner magnet protrudes on the outer circumferential surface of the second extension portion. An end portion of the support portion is provided with a fixing portion for fixing the inner magnet. A through hole is formed below the inner magnet in the second extension part. Cooling holes are formed in the first base part positioned between the first extension part and the second extension part.

Opening edges of the outer rotor are formed with a fixing hole that is filled and fixed during the molding of the insert. The outer rotor is made of metal. A metal plate functioning as a back yoke is inserted between the second extension portion and the inner magnet.

On the other hand, in order to achieve the above object, the present invention extends in a direction substantially perpendicular to the second base portion from the edge of the second base portion having an open portion in the center is formed with an inner magnet is formed on the outer peripheral surface of the second extension portion Rotor; The first extension part having an outer magnet installed on the inner circumferential surface of the bushing coupled to the edge of the opening and inserted and supported by the rotary shaft and extending from the bushing so as to face the outer side of the second extension part at a predetermined interval is insert molded. It provides a double rotor type motor comprising an outer rotor provided with.

Here, the support portion for supporting the inner magnet protrudes on the outer circumferential surface of the second extension portion. A through hole is formed below the inner magnet in the second extension part. The through hole is formed in the lower side of the outer magnet in the first extension portion. A through hole is formed in the outer rotor positioned between the first extension part and the second extension part.

An opening portion of the inner rotor is provided with a fixing hole in which a mold is filled and fixed during insert molding. The inner rotor is made of metal. A metal plate serving as a back yoke is inserted between the first extension portion and the outer magnet.

On the other hand, in order to achieve the above object, a base portion having an open portion in the center, a first extension portion extending in a direction substantially perpendicular to the base portion from the edge of the base portion is provided with an outer magnet on the inner peripheral surface, and the first A dual rotor extending integrally from the one extension portion to face the inner side and having a second extension portion which is formed with an inner magnet on an outer circumferential surface thereof and integrally formed by insert molding; And it provides a double rotor-type motor including a bushing is formed in the center of the rotation shaft is inserted and supported, the bushing provided on the edge of the opening.

Here, the bushing and the double rotor are integrally formed by insert molding. On the outer circumferential surface of the second extension portion, a support portion for supporting the upper and lower surfaces of the inner magnet protrudes.

An end portion of the support portion is provided with a fixing portion for fixing the inner magnet. A through hole is formed below the inner magnet in the second extension part. The through hole is formed in the lower side of the outer magnet in the first extension portion. Cooling holes are formed in the base part positioned between the first extension part and the second extension part.

A metal plate serving as a back yoke is inserted between the first extension portion and the outer magnet. A metal plater serving as a back yoke is inserted between the second extension portion and the inner magnet.

Hereinafter, a double rotor type motor according to the present invention will be described in detail with reference to FIGS. 3 to 7.

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 embodiment of the present invention, the outer rotor 10, the inner rotor 20, and the bushing 40 are fabricated as separate pieces and then assembled and manufactured. It takes a lot of time. In addition, when assembling the rotors (10, 20) and the bushing (40) it is necessary to separately work to accurately align the position.

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

As shown in FIG. 5, the bushing 244 and the inner rotor 220 of the double rotor according to the present embodiment are integrally formed by insert molding. Here, since the configuration of the double rotor except for the structure of the bushing 244 and the inner rotor 220 are integrally provided by the insert molding is the same as the above-described embodiment will be omitted.

As shown, the outer rotor 210 is integrally formed by insert molding the bushing 244 and the inner rotor 220 in the edge of the opening formed in the center portion. Here, the bushing 244 includes a boss 247 into which the rotating shaft is inserted and supported, and ribs 246 formed outside the boss 247 to reinforce strength.

Here, when the bushing 244 and the inner rotor 220 are integrally formed by insert molding on the opening edge of the outer rotor 210, the outer rotor 210, the inner rotor 220, and the bushing are formed. Position alignment between 244 is made simultaneously. That is, when insert molding, the centers of the concentric circles formed by the outer rotor 210, the inner rotor 220, and the bushing 244 are aligned.

When the outer rotor, the inner rotor, and the bushing are manufactured as separate pieces and assembled, the inner rotor 220 and the insert molding are additionally required for the manufacturing time and the time for the alignment. When the bushing 244 is formed at the edge of the opening of the outer rotor 210, the bushing 244 may be formed at a precise position more quickly.

Meanwhile, a fixing hole 214a is formed at the edge of the outer portion of the outer rotor 210 in which a mold is filled and fixed when insert molding. Therefore, since the mold is hardened in the state filled in the fixing hole, the mold forming the bushing 244 and the inner rotor 220 is prevented from being separated from the edge of the opening.

Here, the inner rotor 220 and the bushing 244 is made of an electrically insulating mold, and the outer rotor 210 is preferably made of a metal material.

In addition, the bushing 244 is formed of an electrically insulating material, through which the electricity supplied to the stator is leaked to the outside through the outer rotor 210 and the inner rotor 220 made of metal. To prevent the risk of electric shock

Meanwhile, support parts 227a and 227b supporting the inner magnet 221 protrude from the outer circumferential surface of the second extension part 225, and the upper and lower surfaces of the inner magnet 21 are respectively supported by the support parts 227a and 227b. It is preferably provided on the upper side and the lower side to be attached.

Accordingly, the inner magnet 221 is attached to the upper and lower support portions 227a and 227b, as well as the outer circumferential surface of the second extension portion 225, respectively. Through this, the area to which the inner magnet 221 is attached is increased to prevent the inner magnet 221 from being separated by the centrifugal force generated when the rotor is rotated.

In addition, it is preferable that fixing parts 228a and 228b are provided at ends of the supporting parts 227a and 227b to prevent the inner magnet 221 from being separated. Here, the support parts 227a and 227b and the fixing parts 228a and 228b may be formed by insert molding integrally with the second extension part 225.

In the lower side of the lower support part 227b supporting the lower surface of the inner magnet 221, a plurality of through holes 226 through which air passes are formed at predetermined angles in the circumferential direction to form a cooling structure of the heated motor. . In addition, cooling holes 214a through which air passes are formed in the first base portion 214 of the outer rotor 210 at intervals of a predetermined angle in the circumferential direction.

On the other hand, since the second extension portion 225 is formed of an electrically insulating material, a metal plate 230 serving as a back yoke is inserted between the second extension portion 225 and the inner magnet 221. This is preferred.

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

As shown in FIG. 6, unlike the second embodiment described above, in the double rotor according to the present embodiment, the outer rotor 310 is integrally formed by the bushing 344 and the insert molding instead of the inner rotor 320. . Here, since the configuration of the double rotor except for the structure of the bushing 344 and the outer rotor 320 which are integrally provided by the insert molding is the same as the above-described embodiments, description thereof will be omitted.

As shown, the bushing 344 and the outer rotor 320 are integrally formed by insert molding at the edge of the opening formed in the center of the inner rotor 320. Here, a fixing hole 314a is formed at the edge of the opening to fill and fix the mold during insert molding. Therefore, since the mold is fixed in a state filled in the fixing hole 314a, the mold is prevented from being separated from the edge of the opening.

In this case, the inner rotor 320 is preferably made of a metal material, and the bushing 344 and the outer rotor 310 are preferably made of an integrally insulating mold.

On the other hand, as described in the first embodiment, the second extending portion 325 of the inner rotor 320 is a support for supporting the through hole 326 through which air passes and the lower portion of the inner magnet 321 ( 327 is provided.

In addition, a through hole 315a through which air passes is also formed in the first extension part 315 or the first base part 314 of the outer rotor 310. Here, the through holes 315a may be formed in plural at intervals of a predetermined angle along the circumferential direction.

In addition, since the first extension part 315 is formed of an electrically insulating material, a metal plate 330 serving as a back yoke is inserted between the first extension part 315 and the inner magnet 311. This is preferable.

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

As shown in FIG. 7, according to the present exemplary embodiment, the double rotor 410 and the bushing 444 formed of an inner rotor and an outer rotor are integrally formed by insert molding. Here, the inner rotor and the outer rotor are integrally formed, while the bushing may be configured as a separate piece.

On the other hand, since the configuration except for the structure of the bushing 444 and the double rotor 410 integrally provided by the insert molding is the same as the above-described embodiments will not be described.

As shown in the drawing, the upper surface of the base portion 414 of the dual rotor 410 has a second extension portion 425 having the inner magnet 421 installed on the outer circumferential surface and a first outer magnet 411 installed on the inner circumferential surface thereof. An extension 415 is provided.

Here, upper and lower support portions 427a and 427b protrude from the outer circumferential surface of the second extension portion 425 to support the upper and lower surfaces of the inner magnet 421. Therefore, since the upper and lower surfaces of the inner magnet 421 are attached to the support portions 427a and 427b, the attachment area of the inner magnet 421 is increased. Through this, the inner magnet 421 is prevented from being separated by the centrifugal force generated when the double rotor 410 is rotated.

In addition, fixing ends 428a and 428b surrounding edges of the inner magnet 421 are formed at ends of the upper and lower support portions 427a and 427b, and the fixing portions 428a and 428b are edges of the inner magnet. To prevent deviation. The support portions 427a and 427b and the fixing portions 428a and 428b may be integrally formed with the second extension portion.

Meanwhile, a plurality of through holes 426 are formed in the second extension part 425 at intervals of a predetermined angle in the circumferential direction. Specifically, the through holes 426 are formed below the lower support part 427b. desirable.

In addition, a through hole 415a through which air passes is formed in the first extension part 415, and a cooling hole 414a is also formed in the base 414. Accordingly, the motor heated by the air moved through the through holes 415a and 426 when the double rotor 410 is rotated is cooled.

In addition, since the first extension part 415 and the second extension part 425 are formed of an electrically insulating mold, the first extension part 415 and the second extension part 425 function as a back yoke between the extension parts 415 and 425 and the magnets 411 and 421. Preferably, the metal plates 431 and 430 are inserted.

As mentioned above, the dual rotor type motor according to the present invention provides embodiments for various configurations of the inner rotor, the outer rotor, and the bushing.

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 stator and the double rotor in duplicate, it is possible to provide high rotational torque without increasing the overall volume.

Second, when the parts forming the double rotor are integrally manufactured by insert molding, the time required for manufacturing and assembling the parts can be shortened, and the productivity is improved by easily manufacturing the double rotors with aligned positions. You can.

Third, since the double rotor is formed by insert molding using a mold, it is possible to easily form a cooling hole and a through hole for cooling the motor without using an additional process.

Fourth, by forming a material of the double rotor using a mold instead of a metal having a relatively high elasticity, it is possible to prevent a twisting phenomenon due to vibration and to improve the overall rigidity of the double rotor.

Fifth, by forming a double rotor with an electrically insulating material, it is possible to prevent the electricity supplied to the stator from leaking to the outside.

Claims (25)

An outer rotor having a first extension portion extending from the edge of the first base portion having an open portion at a center thereof in a direction substantially perpendicular to the first base portion, and having an outer magnet installed on an inner circumferential surface thereof; And A bushing coupled to the edge of the opening and inserted and supported by a rotating shaft, and a second extension portion extending from the bushing so as to face the inside of the first extension portion at predetermined intervals and having an inner magnet installed on an outer circumferential surface thereof, are integrally molded. Double rotor type motor including an inner rotor provided. The method of claim 1, Double rotor-type motor, characterized in that the support portion for supporting the upper and lower surfaces of the inner magnet protrudes on the outer peripheral surface of the second extension. The method of claim 2, Double rotor-type motor, characterized in that the fixing portion for fixing the inner magnet at the end of the support portion. The method of claim 2, The double rotor-type motor, characterized in that the through-hole is formed in the lower side of the inner magnet in the second extension. The method of claim 1, The dual rotor-type motor, characterized in that the cooling hole is formed in the first base portion located between the first extension portion and the second extension portion. The method of claim 1, The double rotor-type motor, characterized in that the fixing hole is formed in the opening edge of the outer rotor is filled and fixed when the molding molding the insert. The method of claim 1, The outer rotor is a double rotor-type motor, characterized in that made of a metallic material. The method of claim 1, The dual rotor-type motor, characterized in that between the second extending portion and the inner magnet is inserted into a metal plate functioning as a back yoke. An inner rotor having a second extension portion extending from the edge of the second base portion having an open portion at a center thereof in a direction substantially perpendicular to the second base portion, and having an inner magnet installed on an outer circumferential surface thereof; And A bushing coupled to an edge of the opening and inserted and supported by a rotating shaft, and a first extension portion extending from the bushing so as to face the outside of the second extension portion at a predetermined interval, and having an outer magnet installed on an inner circumferential surface thereof, are integrally molded. Double rotor type motor including an outer rotor provided. The method of claim 9, 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 9, The double rotor-type motor, characterized in that the through-hole is formed in the lower side of the inner magnet in the second extension. The method of claim 9, The double rotor-type motor, characterized in that the through hole is formed in the lower side of the outer magnet in the first extension. The method of claim 9, And a through hole formed in the outer rotor positioned between the first extension part and the second extension part. The method of claim 9, The double rotor-type motor, characterized in that the fixing hole is formed on the edge of the opening of the inner rotor is filled and fixed during the molding of the insert. The method of claim 9, The inner rotor is a double rotor-type motor, characterized in that made of a metallic material. The method of claim 9, The double rotor-type motor, characterized in that between the first extension portion and the outer magnet is inserted into a metal plate functioning as a back yoke. A base portion having an open portion in the center, a first extension portion extending in a direction substantially perpendicular to the base portion from an edge of the base portion, and having an outer magnet installed on an inner circumferential surface thereof, and a predetermined distance inwardly from the first extension portion; A double rotor which is formed to be integrally formed by insert molding of a second extension part in which an inner magnet is installed on an outer circumferential surface thereof so as to face each other; And A double rotor type motor including a bushing formed at the center of the opening and the rotation shaft is inserted in the center, the bush provided on the edge of the opening. The method of claim 17, And the bushing and the double rotor are integrally formed by insert molding. The method of claim 17, Double rotor-type motor, characterized in that the support portion for supporting the upper and lower surfaces of the inner magnet protrudes on the outer peripheral surface of the second extension. The method of claim 19, Double rotor-type motor, characterized in that the fixing portion for fixing the inner magnet at the end of the support portion. The method of claim 17, The double rotor-type motor, characterized in that the through-hole is formed in the lower side of the inner magnet in the second extension. The method of claim 17, The double rotor-type motor, characterized in that the through hole is formed in the lower side of the outer magnet in the first extension. The method of claim 17, The dual rotor-type motor, characterized in that the cooling hole is formed in the base portion located between the first extension portion and the second extension portion. The method of claim 17, The double rotor-type motor, characterized in that between the first extension portion and the outer magnet is inserted into a metal plate functioning as a back yoke. The method of claim 17, A double rotor type magnet, characterized in that a metal plater functioning as a back yoke is inserted between the second extension portion and the inner magnet.

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