KR100595195B1 - stator of outer rotor-type motor for drum-type washing machine - Google Patents

Abstract

The present invention is a stator structure of a motor for a direct drum washing machine having a structure that can be stably mounted on a fixed side such as a tub or a bearing housing while reducing the weight of the material and the stator after manufacturing and simplifying the manufacturing process. It is to provide.

To this end, the present invention is an annular stator core and a stator core of a multi-layer structure by stacking while rotating the iron plate consisting of a strip-shaped base portion and the teeth protruding from the base from the bottom layer to the top layer spirally A shape corresponding to the shape of the upper insulator of the electrically insulating material surrounding the upper side of the stator core, and a shape corresponding to the shape of the stator core, the lower side of the stator core when assembling with the phase insulator Consists of a lower insulator, which is an electrical insulator that is wrapped, integrally formed on the upper insulator and the lower insulator, and the fastening portion protruding from the inside of the stator core toward the center of the stator so as to fix the stator on the fixing side of the tub. It includes, the fastening portion is the tub wall portion side The stator structure of a drum washing machine outer rotor-type motor characterized by the formed fastening holes being formed for fixing the stator to the fastening member.

Drum Washing Machine, Motor, Stator, Insulator, Fastening Part

Description

Stator of outer rotor-type motor for drum washing machine

Figure 1 is a longitudinal sectional view schematically showing the configuration of a conventional direct drum washing machine

FIG. 2 is a perspective view of the stator of FIG. 1

3 is a perspective view illustrating the split core of FIG. 2;

Figure 4 is a perspective view of the stator appearance of the present invention

5 is an exploded perspective view of FIG.

FIG. 6 is a rear perspective view of a portion of the upper insulator of FIG. 5. FIG.

7 is a cross-sectional view of the fastening portion along the line I-I of FIG.

8 is a reference diagram showing the common use of the insulator

9 is a cross-sectional view of a fastener according to another embodiment of the present invention corresponding to FIG. 7.

Explanation of symbols on the main parts of the drawings

1: cabinet 2: tub

3: drum 4: shaft

5: rotor 6: stator

60a: upper insulator 60b: high insulator

600: Fastening part 610: Tees

610a, 610b: step surface 620: boss

620a: fastening hole 630: positioning projection

640: space 650: support rib

660: reinforced rib 670: reinforced rib

680: connecting rib 690: ridge

800: cylindrical metal 15: stator core

150: base portion 151: teeth

151a: Core shoe 152: Indentation groove

153: Rivet

The present invention relates to a drum washing machine, and more particularly, to a stator of an outer rotor type BLDC motor applied to a direct drum washing machine.

In general, the drum washing method is a method in which the laundry is performed using the friction force of the rotating drum and the laundry by receiving the driving force of the motor while the detergent, the washing water, and the laundry are put in the drum. These don't get tangled with each other, and can be washed and pounded.

In addition, the conventional drum washing machine has 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 the rotor of the BLDC motor is directly connected to the drum according to the driving method. It is divided into direct type that transmits driving force.

Here, the driving force of the motor is transmitted directly through the belt wound around the motor pulley and the drum pulley, instead of being directly transmitted to the drum, energy loss occurs in the driving force transmission process, and a lot of noise is generated in the power transmission process.

Therefore, in order to solve such problems of the conventional drum washing machine, the use of a direct drum washing machine using a BLDC motor is increasing.

Referring to Figure 1 briefly look at the structure of the conventional direct-type drum washing machine as follows.

1 is a vertical cross-sectional view illustrating a conventional drum washing machine, in which a tub 2 is installed inside a cabinet 1 and a drum 3 is rotatably installed in the center of the tub 2.

In addition, a motor is installed at the rear side of the tub (2). The stator (6) is fixed to the rear wall of the tub, and the rotor (5) is axially connected to the drum (3) through the tub while surrounding the stator (6). It is installed as possible.

A door 21 is installed in front of the cabinet 1, and a gasket 22 is installed between the door 21 and the tub 2.

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

On the other hand, Figure 2 is a perspective view of the stator appearance of Figure 1, Figure 3 is a perspective view showing a split core (DC) to be applied to the stator of Figure 2, the conventional stator core manufacturing method by pressing a metal iron plate teeth (151) And the base 150 and at the same side of the tooth 151 on the opposite side of the manufacturing unit cores having a protrusion 500 for forming the fastening hole (500a), and then laminated them to make an assembly, again in the circumferential direction The interconnects complete the stator cores, called split cores (DCs).

At this time, the protrusion provides a fastening hole 620a necessary for fastening the stator 6 to the rear wall of the tub and serves to withstand the fastening force of the bolt.

However, the manufacturing method of the stator 6 by such a split core DC is not only complicated in process but also causes a lot of material loss.

Therefore, in order to reduce the loss of material and simplify the manufacturing process, a so-called spiral core, which is formed by spirally rotating an iron plate formed of a tooth and a base part, is useful, but when forming the spiral core (SC), a punch is formed in a band shape. Since the iron plate has to be bent in a spiral, there is a disadvantage that it is impossible to form a protrusion for coupling the stator to the tub inside the core.

This is because, when the spiral core (SC) is manufactured, if the protrusion is formed inside the core, the core width becomes too large at the portion where the protrusion exists so that it is impossible to bend the core.

Therefore, there is a need for a stator structure to which the spiral core SC can be applied by performing the same role as the protrusion of the split core DC rather than performing the same role in the core itself.

For reference, it is important that the rigidity of the protrusion part having the fastening hole for fastening the stator to the tub side is sufficiently secured as follows.

In the washing machine that directly rotates the drum using a BLDC motor, the stator is directly mounted on the fixed side behind the tub. However, in a large drum washing machine motor having a stator weight of more than 1.5 kg and having a dewatering rotation speed of about 600 to 2,000 RPM, the stator is stably due to the stator weight, vibration during high-speed rotation, and shaking and deformation of the rotor 5. The fastening part of (6) is broken.

In particular, in the case of a drum washing machine which fastens the stator 6 to the tub rear wall while using a BLDC motor, since the radial direction of the stator 6 is substantially parallel to the ground, the stator 6 may be caused by vibration generated during the washing machine operation. ), Damage to the fastening portion with the rear wall of the tub is more severe.

Therefore, it is very important that the rigidity of the protrusion part having the fastening hole for fastening the stator 6 to the tub side should be sufficiently secured.

The present invention is to solve the above-mentioned problems, to reduce the material and weight required during manufacturing, manufacturing process is also simple, for a drum washing machine having a stator that can be stably mounted on a fixed side, such as a tub or bearing housing The purpose is to provide an outer rotor type motor.                         

Particularly, the present invention can stably mount the stator on a fixed side such as a tub or a bearing housing while reducing the material as described above, while applying a split core, so that only the weight of the stator becomes 1.5 kg or more, and the rotation It is an object of the present invention to provide a stator structure of a novel structure suitable for a BLDC motor for a drum washing machine whose speed varies from 0 to 2,000 RPM or more.

In order to achieve the above object, the present invention is an annular stator core which is stacked while rotating the iron plate consisting of a strip-shaped base portion and the teeth protruding from the base from the bottom layer to the top layer to form a multilayer structure and A shape corresponding to the shape of the stator core, the phase insulator made of an electrically insulating material covering the upper side of the stator core, and a shape corresponding to the shape of the stator core, and the bottom of the stator core when mutually assembled with the phase insulator. It consists of an insulator that is an electrical insulator that surrounds the side,

It is formed integrally with the upper insulator and the lower insulator, and includes a fastening portion protruding from the inside of the stator core toward the center of the stator so that the stator can be fixed to the fixed side of the tub. The fastening portion includes a stator on the tub wall side. Provided is a stator structure of an outer rotor type motor for a drum washing machine, characterized in that a fastening hole is formed to be fixed by a fastening member.

According to another aspect of the present invention for achieving the above object, the present invention is a multi-layer structure by stacking the iron plate consisting of a strip-shaped base portion and the teeth protruding from the base while rotating spirally from the bottom to the top layer An annular stator core, an electrically insulating phase insulator covering the upper side of the stator core as a shape corresponding to the shape of the stator core, and a shape corresponding to the shape of the stator core. When the assembly is made of a high insulator that is an electrical insulator that wraps around the lower side of the stator core,

It is formed integrally with the upper insulator and the lower insulator, and includes a fastening portion protruding at least three places from the inside of the stator core toward the center of the stator so that the stator can be fixed to the fixed side of the tub, and the fastening portion fixes the stator to the tub wall side. A boss forming a fastening hole is formed to be formed, and the stator structure of the outer rotor-type motor for a drum washing machine, characterized in that the cylindrical metal is installed outside the boss.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, FIGS. 4 to 9.

First, a first embodiment of the present invention will be described with reference to FIGS. 4 to 6.

4 is an external perspective view of the stator of the present invention, FIG. 5 is an exploded perspective view of FIG. 4, FIG. 6 is a rear perspective view of a part of the upper insulator of FIG. 4, and FIG. 7 is a line I-I of FIG. 4. As a cross-sectional view according to the present invention, the stator 6 of the outer rotor type motor according to the first embodiment of the present invention is a steel plate composed of a strip-shaped base portion 150 and a tooth 151 protruding from the base portion 150. An annular stator core 15 that is stacked while rotating in a spiral form from the lowermost layer to the uppermost layer and forms an upper layer of the stator core 15 in a shape corresponding to the shape of the stator core 15. The upper insulator 60a of the electrically insulating material and the shape corresponding to the shape of the stator core 15 are wrapped around the lower side of the stator core 15 when assembled with the upper insulator 60a. Electrical insulator A lower insulator 60b, which is formed integrally with the upper insulator 60a and the lower insulator 60b, and has a stator 6 from the inside of the stator core 15 so as to fix the stator 6 to the fixing side of the tub. ) Includes a fastening part 600 protruding at least three places toward the center.

At this time, the fastening part 600 (see FIG. 5) is formed with a fastening hole 620a (see FIG. 6) which is formed to fix the stator 6 as a fastening member on a fixed side such as a tub, and the fastening hole ( The 620a is formed by the boss 620 protruding toward the non-exposed surface side of the fastening part 600.

In addition, inside the non-exposed surface that is in contact with the upper and lower surfaces of the stator cores 15 of the upper insulator 60a and the lower insulator 60b, support ribs 650 supporting the inner surface of the core are arranged along the circumferential direction. Is formed.

In addition, the fastening part 600 of the upper insulator 60a and the lower insulator 60b is connected to the boss 620 constituting the fastening hole 620a and the support rib 650 to be concentrated on the boss 620. At least one reinforcing rib 660 is provided to disperse the fastening force and reinforce the strength of the fastening part 600.

On the other hand, a reinforcing rib 670 is formed on the inner peripheral surface of each of the fastening parts 600 of the upper and lower insulators 60a and 60b in the non-exposed surface direction, and the support rib supporting the inner surface of the reinforcing rib 670 and the core. At least one connection rib 680 is also radially connected between the 650 to provide mutual support force.

In addition, step surfaces 610a and 610b are formed on both sidewalls of each tooth 610 of the upper insulator 60a and the lower insulator 60b.

At this time, the stepped surfaces 610a and 610b formed on both side wall surfaces of the teeth 610 are formed to form a “b” shape when the other is “a” shape.

In addition, stepped surfaces 610a and 610b are formed on both end surfaces substantially orthogonal to both wall surfaces of the teeth 610 of the upper insulator 60a and the lower insulator 60b.

A seating surface 611a is formed at the ends of the teeth 610 of the upper insulator 60a and the lower insulator 60b on which a core shoe portion of the stator core 15 is seated.

In addition, a positioning protrusion (not shown) formed in a positioning groove or a positioning hole (not shown) formed on a fixed side such as a tub is formed around the fastening hole 620a formed in the fastening portion 600 of the merchant insulator 60a. 630 is formed.

In addition, the cylindrical metal 800 installed in the fastening hole 620a serves as a bushing as a spring pin having elasticity or a hollow pin that is forcibly pressed into the fastening hole 620a by the cut-out portion.

On the other hand, around the fastening hole 620a of the upper insulator 60a and the lower insulator 60b, a ridge 690 is formed to prevent the head of the bolt from directly contacting the cylindrical metal 800 when the bolt is fastened.

In addition, the base portion 150 of the stator core 15 is provided with a recess groove 152 for reducing stress so that a winding operation for forming the core is easily performed, and the stator core 15 has a base portion. Riveted by the rivet 153 penetrating the through-hole formed in the 150 is coupled.

Meanwhile, reference numeral 8 in FIG. 5 denotes a hall sensor assembly for controlling a motor, and reference numeral 9 denotes a tap housing assembly for power connection for supplying power to the stator side.

The operation of the present invention configured as described above is as follows.

First, in the present invention, since the so-called spiral core (SC) is applied as the stator core 15 while spirally rotating the iron plate composed of the teeth 151 and the base portion 150, the stator core 15 is different from the split core DC. Otherwise, the process of squeezing and welding the divided cores together is omitted, simplifying the manufacturing process.

In addition, unlike the split core, the stator core 15 of the present invention does not have protrusions, thereby reducing the loss of material.

That is, the stator manufacturing method of the present invention is not only a simple process, but also can reduce the loss of material.

In addition, the stator 6 of the present invention improves the structure of the upper and lower insulators 60a and 60b without forming a protrusion in the core itself that can withstand the clamping force when fixing the stator 6 to the tub side. Therefore, it has sufficient rigidity against bolting force.

That is, according to the present invention, the stator 6 to which the spiral core SC can be applied is provided by placing the structure that performs the same role as the protrusion of the split core DC on the fastening part 600 of the upper and lower insulators 60a and 60b. ) Can be provided.

In addition, the space 640 between the ribs 650, 660, 670, and 680 provided on the non-exposed surface of the fastening part 600 has a buffering and damping effect on vibration generated when the motor is driven. By doing so, the mechanical reliability of the stator 6 is improved, and the space 640 also contributes to material saving of the insulator.

On the other hand, the support ribs 650 formed along the circumferential direction inside the non-exposed surface, which are in contact with the upper and lower surfaces of the stator core 15 of the upper insulator 60a and the lower insulator 60b, respectively, are formed in the stator core 15. Support the inner side.

In addition, the reinforcing rib 660 formed at the fastening part 600 of the upper insulator 60a and the lower insulator 60b and connecting between the boss 620 and the support rib 650 forming the fastening hole 620a is In addition to dispersing the fastening force concentrated in the boss 620 serves to reinforce the strength of the fastening portion 600.

Therefore, the stator 6 of the present invention has the weight of only the stator of 1.5 kg or more, and even in a large-scale drum washing machine having a dehydration rotation speed of about 600 to 2,000 RPM, the vibration and the shaking and deformation of the rotor 5 at high speed rotation. The damage of the fastening portion of the stator 6 due to this can be effectively prevented.

In addition, the positioning protrusions 630 formed around the fastening hole 620a of the fastening part 600 are joined to the positioning grooves (not shown) of the tub 2 to facilitate the fastening of the stator 6. do.

Therefore, the stator 6 according to the present invention has a positioning protrusion when it is coupled to the tub 2, so that it can be easily assembled, so that the maintenance work of the serviceman can be made more easily even during the after-sales service.

At this time, the positioning projection 630 is formed on the tub 2, the positioning groove may be formed in the fastening portion 600, of course.

8A and 8B are reference diagrams showing common use of the insulator, and the upper and lower insulators 60a and 60b of the present invention can be applied within a certain range even if the stack height of the spiral core SC is changed.

That is, in the case of FIG. 8A, the stack height h1 of the core is a height at which the stepped surfaces 610a and 610b of the upper and lower insulators 60a and 60b are completely matched. In the case of FIG. It is higher than that of 8a to show the case where the stepped surfaces 610a and 610b (see FIGS. 5 and 6) of the upper and lower insulators 60a and 60b are not fully joined and opened.

In the case of FIG. 8B, the stack height h2 of the core is greater than the height at which the stepped surfaces 610a and 610b of the top and bottom insulators 60a and 60b are completely matched, so that the gap between the stepped surfaces 610a and 610b is widened. However, the insulation to the core tooth 151 is made so that it is applicable.

Accordingly, the vertically insulated insulator of the present invention can contribute to improving the workability in the assembly line by allowing it to be used universally regardless of the stack height of the core within a certain range.

9 is a cross-sectional view showing a fastening structure according to another embodiment of the stator of the present invention, the present embodiment is a boss 620 forming a fastening hole 620a in the fastening portion 600 of the upper and lower insulators 60a and 60b. Is formed, and the case where the cylindrical metal 800 is installed outside the boss 620.

That is, in this embodiment, the boss 620, which constitutes the fastening hole 620a for fixing the stator 6 to the fixing side such as the tub, is formed on the non-exposed surface of the upper and lower insulators 60a and 60b, and on the outside thereof. When the cylindrical metal 800 is fitted, this is possible because the insulator is divided into upper and lower pieces.

Meanwhile, the present invention is not limited to the above-described embodiments, and various changes and modifications may be made to various forms without departing from the scope of the technical idea of the present invention.

The effects of the present invention configured as described above are as follows.

First, the present invention can reduce the material and weight required for the stator production of the BLDC motor for the drum washing machine, while simplifying the manufacturing process, it can be stably mounted on a fixed side such as a tub.

In particular, while the present invention reduces the material of the stator core and the insulator, the stator can be stably mounted on a fixed side such as a tub or a bearing housing as in the case of applying a split core, so that the weight of the stator becomes 1.5 kg or more. It is more suitable for BLDC motors for drum washing machines whose rotation speed varies from 0 to 2,000 RPM or more.

In addition, the drum washing machine according to the present invention can be easily assembled when the stator is attached to the tub in the assembly line, and thus the maintenance work can be more easily performed even during service.

In addition, in the drum washing machine of the present invention, by adopting a spiral core (SC) structure that is easy to wind, waste of the base material is prevented and easy to manufacture, and the mechanical reliability is improved by reducing the noise and vibration by increasing the rigidity of the stator. It is possible to improve and extend the lifespan.

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Claims (19)

An annular spiral core which is formed by stacking a steel plate consisting of a strip-shaped base portion and teeth protruding from the base portion while rotating spirally from the bottom layer to the top layer to form a multilayer structure, A phase insulator made of an electrically insulating material covering the upper side of the spiral core in a form corresponding to the shape of the spiral core; As a shape corresponding to the shape of the spiral core, when the assembly with the phase insulator is made of a high insulator which is an electrical insulator that wraps the lower side of the spiral core, It is formed integrally with the upper insulator and the lower insulator and includes a fastening portion projecting from the inside of the spiral core toward the center of the stator so as to fix the stator on the fixed side of the tub. Stator structure of the outer rotor-type motor for a drum washing machine, characterized in that the fastening portion is formed on the tub wall side fastening hole is formed to secure the stator with the fastening member. The method of claim 1, The fastening hole of the fastening portion is a stator structure of the outer rotor type motor for a drum washing machine, characterized in that formed by a boss projecting to the non-exposed surface of the fastening portion. The method of claim 1, Inside the non-exposed surface which is in contact with the upper and lower surfaces of the spiral core of the upper insulator and the lower insulator, respectively. A stator structure of an outer rotor type motor for a drum washing machine, characterized in that a support rib supporting an inner surface of the spiel core is formed along the circumferential direction. The method of claim 1, In the fastening portion of the upper insulator and the lower insulator, The stator structure of the outer rotor type motor for a drum washing machine, characterized in that at least one reinforcing rib is formed to connect the boss forming the fastening hole and the support rib to disperse the fastening force concentrated on the boss and to reinforce the strength of the fastening part. The method of claim 1, On both sidewalls of each tooth of the phase insulator and the high insulator, Stator structure of the outer rotor-type motor for a drum washing machine, characterized in that the stepped surface forming the same plane is formed according to each other when assembled. The method of claim 5, The stepped surface formed on each side wall of each tooth, Stator structure of the outer rotor-type motor for a drum washing machine, characterized in that when the tooth side of any one of the upper and lower insulator is "a" shape, the other side is formed to form a "b" shape. The method of claim 1, Stator structure of the outer rotor type motor for a drum washing machine, characterized in that the stepped surface forming the same plane is formed on both end wall surfaces formed to be substantially orthogonal to both side wall surfaces of each of the upper and lower insulators. The method of claim 1, Stator structure of the outer rotor type motor for a drum washing machine, characterized in that the seating surface on which the core shoe portion of the spiral core is projected is formed outside the two end wall surfaces of the upper insulator and the lower insulator. The method of claim 1, Stator structure of an outer rotor type motor for a drum washing machine, characterized in that a positioning groove formed on a fixed side of a tub or the like is formed around a fastening hole formed in the fastening portion of the merchant insulator. . The method of claim 1, Stator structure of the outer rotor type motor for a drum washing machine, characterized in that the cylindrical metal is installed inside the fastening hole. The method of claim 10, The cylindrical metal is a stator structure of an outer rotor type motor for a drum washing machine, characterized in that the spring pin having elasticity by a portion cut along the longitudinal direction on the outer circumferential surface. The method of claim 10, The cylindrical metal stator structure of the outer rotor type motor for a drum washing machine, characterized in that the hollow pin is forcibly pressed into the fastening hole without having a cutout. The method of claim 1, Stator structure of the outer rotor type motor for a drum washing machine, characterized in that a ridge is formed around the fastening hole of the upper insulator and the lower insulator. An annular spiral core which is formed by stacking a steel plate consisting of a strip-shaped base portion and teeth protruding from the base portion while rotating spirally from the bottom layer to the top layer to form a multilayer structure, A phase insulator made of an electrically insulating material covering the upper side of the spiral core in a form corresponding to the shape of the spiral core; As a shape corresponding to the shape of the spiral core, when the assembly with the phase insulator is made of a high insulator which is an electrical insulator that wraps the lower side of the spiral core, It is formed integrally with the upper insulator and the lower insulator and includes a fastening portion projecting from the inside of the spiral core toward the center of the stator so as to fix the stator on the fixed side of the tub. The fastening portion is formed with a boss forming a fastening hole formed to fix the stator on the tub wall side, the boss outer stator structure of the outer rotor type motor for a washing machine, characterized in that the cylindrical metal is installed. A core wound in a spiral structure and laminated; An insulator made of an insulating material that is formed of a phase insulator and a high insulator to surround the core when coupled to each other; A coil wound around the tooth of the spiral core; And, Stator structure of the motor for a drum washing machine, characterized in that it comprises a fastening portion formed integrally with the insulator and formed to extend inwardly into the core, and a region protruded from the inside again. The method according to any one of claims 1, 14 and 15, The spiral core, From the bottom layer to the top layer spirally wound to form a multi-layer structure, A plurality of teeth protrude radially outward from the base portion of the spiral core, The base portion of the spiral core is a stator structure of the motor for a drum washing machine, characterized in that the groove provided to reduce the stress when the core is wound. The method of claim 16, The spiral core is stator structure of the motor for a drum washing machine, characterized in that the rivet is coupled by a rivet penetrating the through-hole formed in the base portion. The method of claim 16, The winding start portion and the winding end portion of the spiral core are stator structure of the motor for a drum washing machine, characterized in that the welding is bonded to a predetermined portion of the base in contact with each other. The method according to any one of claims 1, 14 and 15, Stator structure of the washing machine motor, characterized in that the fastening portion is formed in three or more places.

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