KR20070013779A - Stator of outer rotor-type motor for drum-type washing machine - Google Patents

Abstract

A stator structure for an outer rotor-type motor for a drum washing machine is provided to stably mount a stator to a bearing housing and to reduce a weight of the stator. A stator structure includes a stator core coupling a split core assembly which is made by laminating unit cores consisting of a strap-shaped base(150) and teeth protruding from the base, an upper insulator(60a) formed in a shape corresponding to a shape of the stator core to enclose an upper portion of the stator core, and a lower insulator(60b) formed in a shape corresponding to the shape of the stator core to enclose a lower portion of the stator core. Plural fastening portions(600) protrude from an inner surface of the core. A fastening hole(620a) is formed on the fastening portion to fix the stator.

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 showing the stator core of FIG.

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 (2), and the rotor (5) penetrates the tub while surrounding the stator (6) and the drum (3). It is installed to be connected to the shaft.

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 500 serves to withstand the fastening force of the bolt while providing a fastening hole 500a necessary for fastening the stator 6 to the rear wall of the tub 2.

However, the manufacturing method of the stator core as shown in FIG. 3 causes a lot of material loss. That is, since the protrusion 500 having fastening holes is formed in order to mount the stator core to the rear wall of the tub 2, a material cost is increased because a lot of materials are not used in the base material.

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 for performing the same role as the protrusion of the split core DC instead of performing the same 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.

In particular, the present invention can stably mount the stator on a fixed side, such as a tub or bearing housing, while reducing the material as described above, only the weight of the stator is 1.5kg or more, the rotation speed is 0 ~ 2,000 RPM or 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 which can vary up to a higher speed.

In order to achieve the above object, the present invention provides a stator core connected in a circumferential direction to a split core assembly formed by stacking a unit core consisting of a strip-shaped base portion and teeth protruding from the base portion, A phase insulator made of an electrically insulating material covering the upper side of the stator core as a shape corresponding to the shape, and an electrical portion surrounding the bottom side of the stator core when assembling the phase insulator with a shape corresponding to the shape of the stator core. It consists of a high insulator which is an insulator, and is integrally formed on the upper insulator and the high insulator, and includes a plurality of protruding fastening portions 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 stator is placed on the tub rear wall side. Fastening holes being formed for fixing to the associated outer member for a drum washing machine characterized in that formed provides a stator structure of a rotor-type motor.

According to another aspect of the present invention for achieving the above object, the present invention is a stator in the circumferential direction of a split core assembly made by stacking a unit core consisting of a strip-shaped base portion and the teeth protruding from the base portion A phase insulator made of an electrically insulating material 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, and the stator core when mutually assembled with the phase insulator. Consists of an insulator that is an electrical insulator that surrounds the lower side of the

It is formed integrally with the upper insulator and the lower insulator, and includes a plurality of protruding fastening portions 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 rear wall side of the tub. A boss forming a fastening hole is formed therein, and a stator structure of an outer rotor type motor for a drum washing machine, characterized in that a 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 includes a unit core including a band-shaped base 150 and a tooth 151 protruding from the base 150. And a stator core 15 having a split core assembly formed by stacking them in a circumferential direction, and an electrical insulating material covering the upper side of the stator core 15 in a form corresponding to the shape of the stator core 15. The upper insulator 60a and a shape corresponding to the shape of the split core 15 are electrical insulators surrounding the lower side of the stator core 15 when assembled with the upper insulator 60a. Consisting of an insulator (60b) It is formed integrally with the upper insulator 60a and the lower insulator 60b, and a plurality of protrusions protrude from the inside of the stator core 15 toward the center of the stator 6 so that the stator 6 can be fixed to the fixed side of the tub. The fastening part 600 is included.

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 which is in contact with the upper and lower surfaces of the split core 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.

In addition, a seating surface 611a is formed at the end of the tooth 610 of the upper insulator 60a and the lower insulator 60b on which a core shoe 151a of the split 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.

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.

Unlike the conventional split core (DC: FIG. 3), the stator core 15 according to the present invention has no formation of protrusions necessary for fastening to the rear wall of the tub, 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 to provide a protrusion 500 capable of withstanding the clamping force when the stator 6 is fixed to the rear wall of the tub. Without forming, it has sufficient rigidity with respect to the bolt fastening force.

That is, the present invention can provide a stator 6 that can be applied to the fastening part 600 of the upper and lower insulators 60a and 60b to perform the same role as the protrusion of the conventional split core DC. Done.

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 on the inside of the non-exposed surface, which are in contact with the upper and lower surfaces of the split core 15 of the upper insulator 60a and the lower insulator 60b, respectively, are divided cores 15. ) To support the inner surface.

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, and thus the maintenance work of the serviceman can be made more easily even after 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.

Meanwhile, FIGS. 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 may be applied within a certain range even if the stack height of the split core DC 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. 8A is higher than that of FIG. 8A, and illustrates a 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 open.

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 upper and lower insulators 60a and 60b are completely matched. Although it is to be opened, 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 forming a fastening hole 620a in the fastening portion 600 of the upper and lower insulators 60a and 60b. 620 is formed, 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, the present invention can stably mount the stator on a fixed side such as a tub or a bearing housing while reducing the material of the stator core and the insulator, so that only the weight of the stator becomes 1.5 kg or more, and the rotation speed is 0 to 2,000 RPM. Or more suitable for BLDC motors for drum washing machines which can vary up to a higher speed.

In addition, the drum washing machine according to the present invention can be easily assembled when the stator is coupled 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 eliminating the protrusion for fixing the stator to the tub, waste of the base material is prevented and manufacturing is easy, and the rigidity of the fastening part of the stator is reduced to reduce noise and vibration, thereby improving mechanical reliability and extending the life. It becomes possible to plan.

Claims (15)

A stator core connected in a circumferential direction to a split core assembly formed by stacking unit cores formed of a strip-shaped base portion and teeth protruding from the base portion; A phase insulator made of an electrically insulating material covering the upper side of the stator core in a form corresponding to the shape of the stator core; Formed to correspond to the shape of the stator core and made of an insulator, which is an electrical insulator that surrounds the lower side of the stator core when assembled with the phase insulator, It is formed integrally with the upper insulator and the lower insulator and includes a plurality of protruding fastening portions from the inside of the split 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 stator core of the upper insulator and the lower insulator, 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 stator 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 stator core is seated is formed outside the tooth 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. A stator core connected in a circumferential direction to a split core assembly formed by stacking unit cores formed of a strip-shaped base portion and teeth protruding from the base portion; A phase insulator made of an electrically insulating material covering the upper side of the stator core in a form corresponding to the shape of the stator core; Formed to correspond to the shape of the stator core and made of an insulator, which is an electrical insulator that surrounds the lower side of the stator core when assembled with the phase insulator, It is formed integrally with the upper insulator and the lower insulator and includes a plurality of protruding fastening portions 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 fastener is formed with a boss constituting a fastening hole formed to fix the stator on the tub rear wall side, the outside of the boss is a stator structure of the outer rotor type motor for a drum washing machine, characterized in that the cylindrical metal is installed. A stator core connected in a circumferential direction to a divided assembly formed by stacking unit cores formed of a strip-shaped base portion and teeth protruding from the base portion; An insulator made of an insulating material formed of an upper side piece and a lower side piece to surround the stator core upon mutual coupling; A coil wound around the teeth of the stator core; And, And a fastening portion formed integrally with the insulator and including a region extending into the stator core and having a plurality of protruding regions therein.

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