KR20050066539A - Motor mounting structure in washing machine and structure of rotor in motor of washing machine - Google Patents

Abstract

Motor mounting structure of the washing machine according to the present invention tub tub laundry is stored; A rotating tub rotatably mounted in the tub and having a laundry cloth contained therein; A drive shaft for rotating the rotating tub; A stator formed by a coil wound around the core to generate a magnetic field; And a rotor frame formed on an outer side of the stator, a shaft support housing formed of a metal material, a bushing for fixing the shaft support housing to the rotor frame, and the rotor frame body being integrally formed. A rotor with a back yoke is included.

According to the present invention, the operational stability of the washing machine can be increased, and since the rotor frame made of a metal material is applied, complicated injection work is not required, so that the time required for manufacturing can be reduced, so that the production yield can be improved. In particular, since the rotor can be produced by a simple operation, manufacturing cost can be reduced.

Description

Motor mounting structure in washing machine and structure of rotor in motor of washing machine}

The present invention relates to a motor structure applied to a washing machine, and in detail, it is possible to reduce the effects of vibration during operation of the washing machine, to lower the manufacturing cost, and to simplify the manufacturing process to increase the production yield. A motor of a washing machine, a motor mounting structure of a washing machine, and a rotor structure of a washing machine motor.

Since the rotor of the conventional washing machine is applied to a rotor that is injection-molded with plastic, an injection process is required in a complicated shape, and since the plastic resin that is injected and formed may shrink and deform while cooling, the original shape cannot be obtained. There is a problem.

1 is a cross-sectional view of a rotor that has been applied to a conventional washing machine.

Referring to FIG. 1, a conventional rotor has an outer shape and is fixed to an inner side of a rotor frame 1 that is injection-molded using a plastic material and an outer end of the rotor frame 1 to which an N pole and an S pole are alternately mounted. The motor is cooled by forming a magnet 3, a back yoke 2 formed outside the magnet 3 and forming a magnetic circuit, and formed on the bottom of the rotor frame 1 to allow forced movement of outside air. A heat dissipation frame (7), a drive shaft (5) inserted into a predetermined hole formed at an opening in the center portion of the rotor frame (1), and a contact portion between the drive shaft (5) and the rotor frame (1). And a serration 4 for allowing the drive shaft 5 to be stably rotated, a fixing bolt 6 inserted into and fixed to the drive shaft 5, and protruding above and / or below the rotor frame 1. Reinforcement ribs 8 are provided to reinforce the strength of the rotor frame 1. It is.

Since the rotor of the conventional washing machine is injection-molded using a plastic resin, there is a risk of being easily deformed by external shock or sudden impact.

In addition, in order for the rotor of a complicated shape to have a desired shape in the injection process, since the mold is made of a complicated shape, there is a problem that the injection process is difficult.

In addition, since there is a risk that deformation may occur in the cooling process after the injection is completed, there is a high risk that the injection molding is made in a shape different from the intended shape. In particular, when the rotor frame 1 is not manufactured to the correct value due to the numerical deformation generated during the injection process, in particular, the cooling process, a collision occurs with another part that can be illustrated as a stator, which causes a failure in the washing machine. have.

On the other hand, when the flexible plastic is made of a material, deformation occurs due to an external force that may be generated during operation of the washing machine, and the operation of the washing machine is stopped or the washing machine stops due to a collision with other items. .

The present invention is proposed to improve the problems as described above, and an object of the present invention is to propose a rotor structure of a washing machine that can increase the operational stability of the washing machine. In addition, an object of the present invention is to propose a motor mounting structure of a washing machine by applying a rotor frame made of metal, which does not require complicated injection work.

In addition, an object of the present invention is to propose a motor mounting structure of the washing machine and a rotor structure of the washing machine motor which can be produced by a simple operation and can reduce the manufacturing cost.

Motor mounting structure of the washing machine according to the present invention for achieving the above object is a laundry tub is stored; A rotating tub rotatably mounted in the tub and having a laundry cloth contained therein; A drive shaft for rotating the rotating tub; A stator formed by a coil wound around the core to generate a magnetic field; And a rotor frame formed on an outer side of the stator, a shaft support housing formed of a metal material, a bushing for fixing the shaft support housing to the rotor frame, and the rotor frame body being integrally formed. A rotor with a back yoke is included.

The rotor structure of the washing machine according to the present invention includes a rotor frame made of iron plate material having a driving shaft supported therein; And the back yoke is formed by folding the outer end of the rotor frame.

By the motor-mounted structure of the washing machine as shown, it is possible to operate the washing machine stably even at high speed rotation, and to reduce the risk of electric current leakage.

Hereinafter, with reference to the drawings propose a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the specific embodiments proposed.

2 is a cross-sectional view of a drum washing machine according to a specific embodiment of the present invention.

Referring to FIG. 2, a washing machine according to the present inventive concept may include a case 10 forming an exterior of a washing machine, a tub 11 formed inside the case 10 to contain water, and a tub 11 of the tub 11. The rotating tub 12 is formed on the inside and the rotating operation is performed in a state in which the water and the laundry cloth is accommodated and the washing is performed by the friction force between the water and the laundry cloth, and the motor 30 formed on the rear side of the rotating tub 12. ), And a drive shaft 25 for directly connecting the motor 30 and the rotating tub 12 to transmit the rotational force of the motor 30 to the rotating tub 12.

The operation of the washing machine according to the present invention is briefly described. The rotational force by the rotation of the motor 30 is transmitted to the rotary tub 12 through the drive shaft 25 to rotate the rotary tub 12. At this time, since the wash water is accommodated in the tub 11, and the wash water and the laundry cloth are accommodated together in the rotary tub 12, the laundry cloth is washed by the rotation operation of the rotary tub 12. In particular, the drive shaft 25 is directly connected between the motor 30 and the rotating tub 12, the torque and the number of revolutions of the motor 30 can be transmitted to the rotating tub 12 as it is. .

The structure of the washing machine of this invention is demonstrated in detail.

An operation button 13 for allowing a user to operate the washing machine in a specific operating state is formed on the front surface of the case 10, so that the user can operate the operating state of the washing machine.

In addition, the weight of the tub 11 is supported by the support plate 22 formed at a predetermined position on the outer periphery of the tub 11, and the damper 19 connecting the support plate 22 and the lower side of the case 10. Can be supported.

In addition, a drain valve 20 formed at a predetermined position below the tub 11 to allow the washing water to be drained in an appropriate washing stroke, and operated by the drain valve 20 to drain the washing water to the outside. Hose 21 is included. Further, although not shown, of course, a water supply valve and a water supply hose may be formed.

In addition, the front end of the tub 11 is connected to the front end of the case 10 and the tub 11, the barrier 16 for preventing the wash water from leaking, the portion where the barrier 16 and the tub 11 contact A predetermined connector 17 is further formed therein so that the barrier 16 can be fixed with respect to the tub 11. Of course, the door 15 is further formed to be spaced inside the barrier 16 so as to prevent the wash water and the laundry cloth from being separated out through the cloth inlet 14.

In addition, the motor 30 has a stator 31 fixed to the tub 11 and fixed to the original forming position together with the tub 11 and a coil 33 wound around the outer circumference of the stator 31. Included. Power is applied to the coil 33 from the outside. The outer side of the stator 31 spaced apart at predetermined intervals includes a rotor 40 fixed to the drive shaft 25 to rotate the drive shaft 25. The rotor 40 may be rotated by an electromagnetic force generated in the relationship with the stator 31. In particular, in the motor 30 of the present invention, the stator 31 is formed on the inside, the outer rotor type (out rotor type) in which the rotor 40 is formed on the outside spaced apart from the stator 31 by a predetermined distance. In the motor, the structure of the rotor 40 is characterized in that it is improved.

In addition, the rear side of the rotating tub 12 is formed integrally with the rotating tub 12, the rotating tub reinforcing portion 23 is formed to be coupled to the drive shaft 25, the rotating tub 23 is a drive shaft ( 25) and rotate one body. To this end, the rotary tub reinforcement 23 may be integrally formed with the rotary tub 23, and a plurality of strength reinforcement ribs may be formed. The rotating tub reinforcement 23 may be coupled to the drive shaft 25 by a screw coupling method. Of course, the intermediate structure between the drive shaft 25 and the connecting structure of the rotary tub reinforcement 23 may be further formed to assist the fastening.

In addition, a tub reinforcement part 24 formed integrally with the tub 11 and fixed to the stator 31 is formed at the rear side of the tub 11, so that the tub 11 is the stator 31. And be fixed in one body. To this end, the tub reinforcement part 24 may be integrally formed with the tub 11, and a plurality of strength reinforcement ribs may be formed as in the case of the rotating tub reinforcement part 23.

On the other hand, since the rotating tub reinforcing portion 23 is fixed to the drive shaft 25 and the tub reinforcing portion 24 is fixed to the stator 31, the rotating tub reinforcing portion 23 is rotated by the driving shaft 25. This is done. The tub reinforcement part 24 is fixed to the stator 31 and stopped. Any variation may be applied wherever possible within the scope of the idea as set forth. For example, it may be interposed between the stator 31 and the tub reinforcement 24, the connection structure is reinforced to any strength that can be interposed between the drive shaft 25 and the rotary tub reinforcement 23. In a state in which the rotating tub 12 is maintained in a rotating state and the tub 11 can be maintained in a stopped state, such as a connection structure in which any strength is reinforced, any structure and method may be applied. I will say.

The present invention is characterized in that the structure of the motor 30 is improved, in detail, the structure of the rotor 40 applied to the motor 30 is improved. That is, the structure of the rotor 40 is improved in the outer rotor type motor in which the stator 31 is placed inside and the rotor 40 is placed outside of the stator 31 based on a predetermined central axis. . In addition, the motor of the washing machine according to the present invention is a BLDC motor in which the rotational speed, rotational phase, etc. of the motor can be controlled by the position of the detected rotor by detecting the rotation state of the rotor by a predetermined sensor.

This embodiment will be described by taking a drum washing machine, in particular a drum washing machine of the type directly connected to the rotary tub without the application of a belt, but may also be applied to a pulsater type or an agitator type. .

3 is a cross-sectional view of a motor portion to which the idea of the present invention is applied.

Referring to FIG. 3, a stator 31 is wound around a core 33 and a rotor 40. In addition, the stator 31 is fixed to the tub 11, the rotor 40 is fixed to the rotating tub 12 by the drive shaft 25 so that the torque of the rotor 40 is transmitted to the rotating tub 12. Be sure to The rotor 40 may include a rotor frame 41 made of metal constituting the main body of the rotor 40, a shaft support housing 60 through which a driving shaft 25 is inserted to transmit rotational force to the driving shaft 25, and The bushing 70 is seated and fixed to the rotor frame 41 after injection molding is formed while the shaft supporting housing 60 is inserted. In addition, a nut 76 for fixing the drive shaft 25 after the drive shaft 25 is inserted into the shaft support housing 60 is included.

The configuration of the rotor 40 will be described in more detail.

The rotor 40 includes a rotor frame 41 made of a metal such as iron, a magnet 46 formed on an inner side of a portion that is bent upward from an outer end of the rotor frame 41, and the rotor frame. A back yoke 45 formed by bending an outer end of the head 41 and a coupling part 48 for maintaining the shape of the back yoke 45 in a circular shape are included.

The back yoke 45 is a portion in which the rotor frame 41 is formed by bending an outer end thereof while the rotor frame 41 is being manufactured. The end of the rotor frame 41 forms a bending end 47 and the other. It is formed by completely bending 180 degrees in the direction. When the end of the rotor frame 41 is bent in this way, the end of the rotor frame 41 may be formed to a predetermined thickness or more. As such, the overall thickness of the outer end of the rotor frame 41 being bent by the bending end 47 may be performed as a back yoke 45 constituting a magnetic circuit. In addition, since the strength of the rotor frame 41 itself is reinforced, the role of the reinforcing part not to be deformed when the rotor frame 41 is rotated may be performed.

On the other hand, since the back yoke 45 is a portion formed by bending in the shape of the rotor frame 41, an elastic force to be restored to its original shape is generated, and the shape of the back yoke 45 is deformed by such elastic force. Coupling portion 48 is formed so as not to be. The coupling portion 48 may be applied in various ways such as welding, screwing, etc., as long as both sides of the bent rotor frame 41 may be coupled, any type of coupling method may be used.

In addition, although the back yoke 45 is formed to have a thickness in which the rotor frame 41 is bent once, it is bent at least twice within a range that allows the processing of the rotor frame 41 to have a relatively large thickness. The low back yoke 45 may be formed. In addition, in order to facilitate the process of forming the back yoke 45 by folding the outer end of the rotor frame 41, the back frame is cut after being cut in a triangular shape at a predetermined interval, so that the back yoke ( 45) may be formed.

The fan 42 is bent at a predetermined position on the horizontal surface of the rotor frame 41 by bending the rotor frame 41 to generate a forced wind tunnel when the rotor 40 is rotated, thereby allowing the motor to cool / dehumidify the fan 42. ) Is included. In addition, at a predetermined position between the fans 42, the horizontal surface of the rotor frame 41 is deformed into a predetermined shape, and a reinforcing forming part 43 for reinforcing the strength of the rotor frame 41 is processed.

The fan 42 causes a forced wind tunnel to be generated when the rotor frame 41 rotates, thereby allowing the air flow to be transferred to the motor, in particular the side of the stator 31. By such forced air flow, moisture such as dew, which may be generated by the temperature change of the washing machine, can be easily evaporated by the convection action. Furthermore, by allowing the motor to cool, the motor is not overheated.

The reinforcing forming unit 43 is to prevent the deformation of the rotor frame 41 during the high-speed rotation of the motor up to 2,000rpm, so that the washing machine can operate normally. The fan 42 and the reinforcing forming part 43 may be naturally processed by a process of pressing a predetermined form after a predetermined iron plate is cut by a punching operation. A drain hole 52 is formed on the horizontal surface of the rotor frame 41 so that water drains.

On the other hand, the shaft support housing 60 is injection molded in the state of being inserted into the bushing (70). Then, after the shaft support housing 60 is placed on one side of the rotor frame 41 in the injection molded state of the bushing 70, the rotor frame 41 by a predetermined fastening member exemplified by a bolt. Is coupled to. Since the bushing 70 is an insulator as a resin material, the rotor frame 41 may not be energized with the shaft support housing 60.

In detail, an inner serration portion which contacts the serration formed on the outer circumferential surface of the drive shaft 25 on the inner circumferential surface of the predetermined hole formed at the center of the shaft support housing 60 to allow the drive shaft 25 to rotate accurately. 62 is formed. And, when the bushing 70 is injection molded in the state in which the shaft support housing 60 is inserted, the shaft support housing 60 to prevent peeling or detachment between the bushing 70 and the shaft support housing 60. Protrusion 61 and outer serration 63 are formed on the outer side of the).

As such, after the bushing 70 is molded to insert the shaft support housing 60, the bushing 70 is fixed to one side of the rotor frame 41. Hereinafter, the bushing 70 and the rotor frame 41 are fixed. The fixing of will be described.

The contact portion between the bushing 70 and the rotor frame 41 should be such that the bushing 70 does not fall by the shear stress generated when the rotor 40 rotates, that is, the stator 31 and the magnet ( In order to ensure that the torque generated from the magnet 46 due to electromagnetic interaction with the 46 is transmitted to the drive shaft 25 through the rotor frame 41, the rotor frame 41 and Via the bushing 70. At this time, the bushing 70 is to be firmly fixed to the rotor frame 41 so that the torque is transmitted stably.

In detail, the bushing 70 includes a mounting protrusion 71 which extends downward from at least two locations on the lower side of the bushing 70, and penetrates through the bushing 70 to form a bolt 74. The bushing side fixing hole 72 for inserting is formed. The mounting protrusion 71 is formed with a cooling hole 73 formed inside the mounting protrusion 71 in order to prevent deformation of the mounting protrusion 71 upon cooling after being injected.

In addition, a seating guide 49 for inserting the seating protrusion 71 into the rotor frame 41 corresponding to the bushing 70 to guide the position of the bushing 70, and the bushing side fixing hole 72. The frame side fixing hole 50 formed at the corresponding position is included.

A process in which the bushing 70 is fixed to the rotor frame 41 will be described. At this time, of course, the shaft support housing 60 is inserted into the bushing 70.

In order to conveniently locate the exact position on which the bushing 70 is placed, the seating protrusion 71 is inserted into the seating guide 49. In particular, since the seating protrusion 71 and the seating guide 49 are formed in at least two places, the bushing 70 may be placed at the correct position. In addition, a center frame 51 into which the bushing 70 may be fitted is formed at the center of the rotor frame 41, and a center portion of the bushing 70 is formed in a shape corresponding to that of the bushing 51. . Meanwhile, the seating protrusion 71 and the seating guide 49 not only allow the bushing 70 to be conveniently mounted, but also separate the bushing 70 and the rotor frame 41 when the rotor 40 is rotated. Is prevented, and also serves to prevent breakage of the bushing 70. In the state where the mounting protrusion 71 is inserted into the mounting guide 49, the frame side fixing hole 50 and the bushing side fixing hole 72 are aligned in a line.

After the bushing 70 is conveniently seated on the set frame 51 of the rotor frame 51 by the seating protrusion 71 and the seating guide 49, the bolt 74 is fixed to the frame side fixing hole 50. ) And the bushing side fixing hole 72, the nut 75 is inserted into the end portion and fastened. The bushing 70 is firmly fixed to the rotor frame 41 by the bolt 74 and the nut 75. In addition, the seating protrusion 71 and the bushing side fixing hole 72 may be formed at the same distance from the center of the bushing 70 at equal intervals to be balanced.

4 is a perspective view of the shaft support housing according to the inventive concept.

Referring to FIG. 4, the shaft support housing 60 has a cylindrical shape as a whole, and a drive shaft 25 is inserted into a hole formed up and down, and the bushing 70 has a liquid injection liquid in the bushing 70. As the insert is being injected into the bushing (70) and fixed to one body. At least one protrusion 61 having a relatively large size is formed at the outer edge of the shaft support housing 60 so that the position of the shaft support housing 60 is firmly fixed while the bushing 70 is inserted into the insert. The outer serration 63 is formed above the protrusion 61. The outer serration 63 may be selectively coupled to a shaft different from the driving shaft 25 to transmit the rotational force of the rotor 40. The lower part of the outer serration 63 is insert-inserted into the bushing 70, so that it can withstand shear stress more strongly.

In addition, an inner serration 62 extending vertically is formed in the hole into which the driving shaft 25 is inserted, and when the driving shaft 25 is inserted and operated, the shaft supporting housing 60 and the driving shaft 25 are formed. To prevent each other from slipping.

In addition, the shaft support housing 60 may be made of a sintered metal to be more conveniently manufactured.

5 is a perspective view of a bushing to which the idea of the present invention is applied.

Referring to FIG. 5, a shaft supporting housing 60 is formed at a central portion of the bushing 70 to be integrally injected at the time of forming the bushing 70 and firmly fixed in position. In addition, an inner serration 62 is formed in the center portion of the shaft support housing 60 in an up and down direction to form a hole into which the drive shaft 25 is inserted, and an outer circumference of the bushing 70 and the shaft support housing 60 is formed. An outer serration 63 is formed to increase the degree of coupling.

In addition, a seating protrusion 71 and a bushing side fixing hole 72 are formed on one side of the bushing 70 at three equal intervals.

6 is a partially cutaway perspective view of the rotor frame according to the spirit of the present invention.

Referring to Figure 6, the side wall of the rotor frame 41 is formed with a magnet 46 and a back yoke 45 formed on the inside and outside, respectively, the magnet 46 is a plurality of individual magnets are rounded The rotor frame 41 may be attached to the inner side of the outer end and used. In addition, the back yoke 45 is a portion in which the outer end of the rotor frame 41 is bent at the bent end 47, as described above, and the rotor bent at the bent end by the coupling part 48. The shape of the back yoke 45 made by the frame 41 is not deformed.

In detail, in the center of the rotor frame 41, a laying frame 51 for placing the bushing 70 is formed, and a seating guide for conveniently selecting a position of the bushing 70 to enhance the convenience of a worker's work. And a frame side fixing hole 50 which is aligned with the bushing side fixing hole 72 so that the bushing is fixed to the rotor frame 41 after the bushing 70 is placed.

In addition, the fan 42 is a portion in which the horizontal plane of the rotor frame 41 is radially cut and bent upward, and the bent and opened portion functions as a predetermined through hole. In addition, the reinforcing forming part 43 may be formed by being pressed upwards to prevent the rotor 40 from being deformed at high speed. In particular, the fan 42 and the reinforcing forming part 43 may be radially formed in plural, thereby preventing the rotor 40 from being deformed by the vibration transmitted radially. In addition, since the fan 42 is formed over almost the entire area in the radial direction of the rotor frame 41, the outside air can be sucked over a wider range, and thus the cooling efficiency can be further increased.

Meanwhile, in FIG. 6, the outer end portion of the rotor frame 41 is bent to the outside to form the back yoke 45, but the same applies to the case where the outer end portion of the rotor frame 41 is bent to the inside. The function of the back yoke 45 can be performed. However, at this time, the formation position of the magnet 46 may be attached to the inner side of the back yoke 45 that is bent.

7 is a view for explaining another embodiment of the present invention.

Referring to FIG. 7, the other embodiment is the same as or similar to the original embodiment in other parts, except that the bushing 70 is fixed to the bottom of the rotor frame 41. In other words, as in the original embodiment, the shaft support housing 60 is fixed to the inside of the bushing 70 by a process in which the shaft support housing 60 is inserted into and ejected from the bushing 70. However, unlike the original embodiment, the mounting protrusions 71 are protruded to the upper side of the bushing 70, and there is a difference only in that the set frame 51 protrudes to the upper side of the rotor frame 41.

The production yield of the rotor can be improved by the present invention. Furthermore, since the current flow that can be transmitted through the conductive conductive rotor frame 41 and the shaft support housing 60 is blocked by the non-conductive bushing 70, the rotor through the stator 31 or the like. Even when a short circuit occurs in the frame 41, it may not be transmitted to the driving shaft 25.

According to the present invention, the operational stability of the washing machine can be increased, and since the rotor frame made of a metal material is applied, complicated injection work is not required, so that the time required for manufacturing can be reduced, so that the production yield can be improved.

In addition, since the rotor can be produced by a simple operation according to the present invention, manufacturing cost can be reduced.

In addition, since the back yoke is formed by the method of bending the outer end of the rotor frame, the back yoke can be stably formed to a predetermined thickness.

1 is a cross-sectional view of a rotor that has been applied to a conventional washing machine.

2 is a cross-sectional view of a drum washing machine according to a specific embodiment of the present invention.

3 is a cross-sectional view of a motor portion to which the idea of the present invention is applied.

4 is a perspective view of the shaft support housing according to the spirit of the present invention.

5 is a perspective view of the bushing to which the idea of the present invention is applied.

6 is a partial cutaway perspective view of the rotor frame according to the spirit of the present invention;

7 illustrates another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10 case 11 tub 12 rotating tub 13 operating button

14 gun opening 15 door 16 barrier 17 connecting port

19 Damper 20 Drain valve 21 Drain hose 22 Support plate

25 drive shaft 30 motor 31 stator 33 coil

40: rotor 41: rotor frame

Claims (8)

A tub in which laundry cloths are stored; A rotating tub rotatably mounted in the tub and having a laundry cloth contained therein; A drive shaft for rotating the rotating tub; A stator formed by a coil wound around the core to generate a magnetic field; And Is formed on the outside of the stator, The rotor includes a rotor frame made of a metal material, an axial support housing formed of a metal material, a bushing for fixing the axial support housing to the rotor frame, and a back yoke which is formed integrally with the rotor frame body. Motor mounting structure of the washing machine. The method of claim 1, The back yoke is a motor mounting structure of the washing machine is formed by bending the end of the rotor frame 180 degrees inward or outward. The method of claim 1, Motor mounting structure of the washing machine includes a coupling portion for allowing the bent end of the back yoke is coupled to the rotor frame. The method of claim 1, The back yoke is a motor mounting structure of the washing machine is formed by bending the outer end of the rotor frame in the downward direction. The method of claim 1, The back yoke is a motor mounting structure of a washing machine in which a portion bent by the outer end of the rotor frame is completely in contact with the main body of the rotor frame. The method of claim 1, The motor mounting structure of the washing machine including a plurality of seating guides protruding from the upper or lower side of the bushing. The method of claim 1, The motor mounting structure of the washing machine including a settle that allows the center of the bushing to be conveniently seated on the rotor frame. A rotor frame made of iron plate material having a driving shaft supported therein; Rotor structure of a washing machine motor including a back yoke formed by folding the outer end of the rotor frame.