KR101208527B1 - Stator having more strengthened fastening structure and washing machine with the same therein - Google Patents

Abstract

The present invention relates to a stator for an electric motor and a washing machine including the same. More particularly, the present invention relates to a stator with which the fastening portion of the stator is strengthened in strength and its washing machine. The washing machine according to the present invention comprises a motor providing a rotational driving force for washing, wherein the stator of the motor comprises: a stator core having a plurality of poles and a base; An insulator coupled to the stator core; A plurality of fastening portions each having a fastening hole through which the stator fastening bolt passes; A plurality of connecting portions having vertical ribs connecting the insulator to the respective fastening portions; .

Motor, Washing Machine, Stator, Fastening, Injection Molding

Description

Stator with structurally strengthening fastening structure and washing machine comprising same {STATOR HAVING MORE STRENGTHENED FASTENING STRUCTURE AND WASHING MACHINE WITH THE SAME THEREIN}

1 shows a conventional drum washing machine.

2 shows a conventional stator.

3 shows a top view of a stator according to the present invention.

4 shows a bottom view of the stator according to the invention.

5 is a partially enlarged view of FIG. 3.

6 shows the positional relationship between the through groove of the stator core and the gate portion.

Description of the main parts of the drawing

101: coil 110: insulator

111: circumferential rib 112: gate portion

113: virtual gate portion 114, 115: melt flow path

120: fastening portion 130: connection portion

131 ~ 135: Vertical rib 136: Horizontal rib

137: drain hole 138: positioning projection

140: stator core 141: pole

142: base 143: through groove

The present invention relates to a stator for an electric motor and a washing machine including the same. More particularly, the present invention relates to a stator with which the fastening portion of the stator is strengthened in strength and its 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.

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, depending on 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.

Meanwhile, 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.

Fig. 2 shows a conventional stator installed on the tub rear wall as described above.

As shown in the drawing, the conventional stator 6 has a spiral core SC and an electrical insulating material covering the upper side of the spiral core SC in a form corresponding to the shape of the spiral core SC. The upper insulator 60a and the shape of the spiral core (SC) corresponding to the shape of the electrical insulator that surrounds the lower side of the spiral core (SC) when mutually assembled with the upper insulator (60a) (Bottom) consists of an insulator 60b, which is formed integrally with the upper insulator 60a and the lower insulator 60b, and is located inside the spiral core SC so that the stator 6 can be fixed to the fixed side. The fastening part 600 is included.

Here, the fastening part 600 is formed with a fastening hole 620a which is formed to fix the stator 6 as a fastening member on the fixed side, and the fastening hole 620a is on the non-exposed surface side of the fastening part 600. It is formed by the protruding boss 620.

Positioning projections 630 that are formed in a positioning groove (not shown) or a positioning hole (not shown) formed on a fixed side around the fastening hole 620a formed in the fastening portion 600 of the merchant insulator 60a. Is formed.

However, the above-described conventional stator has a problem that breakage occurs in the fastening portion. When the motor is driven, the stator generates heat, and the fastening part is repeatedly subjected to thermal stress due to the heat, and thus, there is a problem in that it is finally damaged due to the thermal stress repeatedly received.

An object of the present invention is to solve the above conventional problem.

In addition, the present invention proposes a structurally strengthened stator fastening structure, and the stator core and the fastening structure are combined by insert injection molding, thereby increasing work efficiency and presenting a more firmly coupled stator.

Washing machine according to the present invention comprises a motor for providing a rotational driving force for washing, the stator of the motor comprises: a stator core having a plurality of poles and a base; An insulator coupled to the stator core; A plurality of fastening portions each having a fastening hole through which the stator fastening bolt passes; A plurality of connecting portions having vertical ribs connecting the insulator to the respective fastening portions; .

Here, among the vertical ribs, the vertical ribs disposed on the extension lines of the poles closest to the vertical ribs may be arranged so as not to coincide with the direction of the extension lines.

Preferably, each connection part includes a central vertical rib connecting the insulator and the physique part to the shortest distance. More preferably, the central vertical rib is disposed between the pole and the pole. Specifically, the center vertical rib is preferably disposed between the extension lines of the two closest poles.

As described above, since the vertical ribs are arranged so as not to coincide with the direction of the extension line on the extension line of the pole, the fastening part is less stressed caused by thermal deformation.

Conventionally, as shown in Fig. 2, the center vertical ribs 601 are arranged to coincide with the extension line A direction on the extension line A of the pole, so that the fastening portion has a lot of stress caused by thermal deformation. There was a problem.

When the arrangement direction of the vertical rib coincides with the extension line direction of the pole, the amount of thermal expansion and deformation in the direction increases, and such deformation acts to push the fastening portion, and the fastening portion fixed by the bolt is stressed accordingly.

As the driving of the motor stops and the temperature of the stator decreases, it is affected by thermal contraction as opposed to the thermal expansion as described above.

Thus, due to the effects of thermal expansion and thermal contraction, there was a problem that the fastening part eventually breaks.

In addition, the vertical ribs are preferably arranged to be symmetrical with respect to the central vertical rib. The asymmetrical structure results in an unbalanced thermal strain, which can cause the joint to be subjected to more stress.

And, preferably includes a horizontal rib connecting the vertical ribs. Strengthen the horizontal ribs and fastening portion.

In addition, the vertical ribs are preferably formed symmetrically with respect to the horizontal ribs.

It is preferable that the drainage hole is formed in the horizontal rib. If water accumulates on the horizontal ribs, it may cause a short circuit. If there is much moisture in the air, water may accumulate in the horizontal ribs due to condensation. The drainage hole allows the water accumulated in the horizontal ribs to be immediately drained.

In particular, in the case of the pulsator type washing machine, since the stator is installed at the lower portion of the tub installed upright, there is more room for water to accumulate on the horizontal ribs. In the case of a washing machine in which a tub is inclined in a drum washing machine, there is much room for water to accumulate in the horizontal rib.

In addition, each of the fastening portion is preferably disposed to face the other fastening portion. In addition, it is preferable that the other fastening portions are arranged symmetrically with respect to the line connecting the respective fastening portions and the opposite fastening portions.

This symmetrical arrangement of the fasteners guides the center of the stator to its installation location when installing the stator to the tub, helping to facilitate work.

In addition, the fastening portion is preferably higher in height than the vertical ribs. When mounting the stator to the tub, a washer is interposed on the upper or lower surface of the fastening portion. At this time, if the height of the vertical rib is higher, the washer may not be properly seated in the fastening portion, which is a factor that makes the fastening of the stator uncertain.

In addition, since the fastening portion is generally thicker than the vertical ribs, the deformation due to shrinkage during cooling during the injection molding operation is greater than that of the vertical ribs. At this time, the upper or lower fastening portion may be recessed to a lower position than the vertical ribs, which may cause the fastening of the stator as described above. However, if the height of the fastening portion is higher as described above, the height of the fastening portion can be prevented because the height of the fastening portion can be maintained higher or at least the same height than the vertical ribs.

Preferably, the insulator, the fastening portion, and the connecting portion are inserted into the stator core by injection molding and integrally formed with the stator core.

In addition, the insulator is preferably formed to surround at least poles of the stator core to serve as an insulator.

Conventionally, the insulator has been assembled up and down with the stator core. This assembly is not only a poor working efficiency, but if the vibration continues to be used over a long period of time, the assembly may be loose, causing problems such as breakage. It can also cause noise.

Preferably, the stator core is formed with a through groove so that the top and bottom of the insulator can be connected. When the plastic melt is injected while the stator core is inserted into the mold, the melt flows into the through groove to eventually connect the upper and lower parts of the insulator. This not only secures the coupling between the insulator and the stator core, but also serves to support to reduce thermal deformation, thereby helping to prevent the problem of breakage of the fastening portion caused by thermal deformation as in the related art.

And, the gate portion for injecting the plastic melt is preferably arranged to at least partially overlap with the through groove. Here, overlapping does not mean directly overlapping each other, but rather overlapping when viewed from above.

When the gate part and the through hole overlap each other, the plastic melt may flow smoothly to the lower part of the insulator.

Preferably, a rib is formed on the upper surface of the insulator vertically along the circumferential direction, and the gate portion is preferably positioned on the rib.

Here, when the plastic melt is injected into the cavity of the mold to fill the cavity, it is preferable that the fastening portion has no interface between the plastic melt flowing in different directions. This is because such an interface is relatively weak in strength.

Therefore, in order to prevent the boundary surface as described above from being formed in the fastening part, the gate part for injection molding is preferably spaced apart from an extension line connecting the center of the fastening part and the center of the stator core.

Hereinafter, preferred embodiments of the present invention will be described in more detail.

The washing machine according to the present invention is different from the conventional washing machine and the stator as shown in FIG. 1, but other configurations are not significantly different. Therefore, here, the stator proposed by the present invention will be described, and description of other configurations will be omitted.

Fig. 3 shows the top of the stator, and Fig. 4 shows the bottom.

As shown in the accompanying drawings, the insulator 110 is coupled to the stator core 140, the fastening portion 120 is disposed inside the stator and is connected to the insulator 110 by the connecting portion 130.

The fastening part 120, the insulator 110, and the connecting part 130 are all formed integrally by plastic injection molding. In addition, they are injection molded in a state where the stator core 140 is inserted into a mold and integrally coupled with the stator core 140.

In this case, the insulator 110 is formed to surround the pole 141 of the stator core 140 and serves as insulation. In the drawing, the coil 101 is wound around the pole 141 of the insulator 110.

Such a stator is mounted to the washing machine as shown in FIG. 1 by a fastening bolt at the rear of the tub. In addition, the fastening part 120 has a fastening hole through which the bolt can pass through for fastening as described above.

At this time, a washer (not shown) is interposed between the bolt and the fastening part 120 or between the tub and the fastening part 120.

The connection part 130 is vertically formed and has a plurality of vertical ribs 131 to 135 connecting the fastening part 120 and the insulator 110.

The central vertical rib 133 connects the fastening part 120 and the insulator 110 to the shortest distance.

As shown, when the vertical ribs are disposed on the extension lines B and C of the closest pole 141, the direction of the extension lines B and C does not coincide with the arrangement direction.

The central vertical rib 133 is disposed between the extension lines B and C of two adjacent poles.

In addition, the other vertical ribs 131 to 135 are disposed symmetrically with respect to the central vertical rib 133. That is, the first vertical rib 131 and the second vertical rib 132 are disposed symmetrically with the fourth vertical rib 135 and the third vertical rib 134 with respect to the center vertical rib 133.

Here, the positioning protrusion 138 is positioned between the first vertical rib 131 and the second vertical rib 132.

The vertical ribs 131 to 135 are connected by horizontal ribs 136 formed horizontally. A drain hole 137 is formed in the horizontal rib 136.

The vertical ribs 131 to 135 of the fastening part 120 and the connection part 130 are symmetrical with respect to the horizontal rib 136. That is, as shown in FIGS. 3 and 4, the fastening part 120 and the connection part 130 are formed in a symmetrical shape of the upper part and the lower part except the positioning protrusion 138.

If the vertical ribs 131 to 135 of the connecting portion 130 are formed asymmetrically up and down, the stress applied to the fastening portion 120 by thermal expansion or thermal contraction of the vertical ribs 131 to 135 is different from the upper and lower portions. This will act as another factor of the fastening portion 120 strength degradation.

3 and 4, the arrangement of the fastening portions is symmetrical inside the stator core 140. As shown in FIG. Each fastening portion has a fastening portion disposed opposite to each other, and the other fastening portions are symmetrically disposed with respect to a line connecting each fastening portion and the opposite fastening portion.

Since the fastening portions are symmetrically arranged in this manner, the centering of the stator and the mounting portion of the tub becomes easy when the stator is fastened to the tub.

In addition, as shown in Figure 6, the stator core 140 has a through groove 143, the plastic melt flows into the through groove 143 during injection molding to connect the top and bottom of the insulator 110. .

A portion of the insulator 110 filled in the through groove 143 serves to more firmly couple the core 140 and the insulator 110. In addition, the portion filled in the through groove 143 also serves to reduce the degree of thermal deformation of the insulator 110 and the fastening portion 120. As the amount of heat deformation is smaller, the fastening part 120 receives less stress.

In addition, the insulator 110 is formed with a circumferential rib 111 formed vertically along the circumferential direction.

On the other hand, the gate portion 112 into which the plastic melt is injected is located in the circumferential rib 111. In addition, the gate part 112 is not positioned on an extension line D connecting the center of the fastening part 120 and the center of the stator core 140, and is spaced apart therefrom.

When the gate portion is positioned on the extension line D as shown in the virtual gate portion 113 shown in FIG. 5, the plastic melt flows along the left path 114 and the right path 115 to form the fastening part 120. Where they meet, they form a boundary. Such an interface may be a cause of breakage of the fastening part 120 because its strength is weaker than that of other parts.

Therefore, the gate portion 112 is disposed to be spaced apart from the extension line D by a predetermined distance.

As shown in FIG. 6, the gate part 112 is disposed to at least partially overlap the through groove 143 of the state core 140. The plastic melt introduced through the gate portion 112 smoothly flows downward through the through groove 143.

 In addition, the height of the fastening portion 120 is higher than the vertical ribs (131 ~ 135) of the connecting portion 130, as shown in FIGS. If the height of the vertical ribs 131 to 135 is higher when the washer is interposed over the fastening part 120, the washer and the vertical ribs 131 to 135 may interfere with each other, thereby causing the stator to The fastening may not be firm.

If there is a gap between the washer and the fastening portion 120, the gap causes the fastening of the stator to the tub to become loose during use. Even if such a gap exists, the stator may be initially fastened to the tub tightly, but the coupling becomes loose while thermal deformation occurs in the fastening unit 120 while the motor is driven.

According to the present invention, the conventional problem as described above can be solved.

It is possible to obtain a structurally strengthened stator fastening structure, and the stator core and the fastening structure are combined by insert injection molding to increase work efficiency and at the same time obtain a more firmly coupled stator.

In addition, it is possible to obtain a washing machine in which the stator is more firmly fastened to the tub, and the problem of breakage of the fastening part caused by thermal deformation during use is prevented.

Claims (16)

A washing machine comprising a motor providing a rotational driving force for laundry, the stator of the motor being: A stator core having a plurality of poles and a base; An insulator coupled to the stator core; A plurality of fastening portions each having a fastening hole through which the stator fastening bolt passes; A plurality of connecting portions having vertical ribs connecting the insulator to the respective fastening portions; Including, Washing machine, characterized in that the vertical ribs disposed on the extension line of each pole closest to each of the vertical ribs of the vertical ribs are not aligned with the direction of the extension line. The method of claim 1, And each connection part comprises a central vertical rib connecting the insulator and the respective fastening parts in the shortest distance. 3. The method of claim 2, And the center vertical rib is disposed between the extension lines of the two poles closest to the center vertical rib. The method of claim 3, Washing machine, characterized in that the vertical ribs of the connecting portion are arranged to be symmetrical with respect to the central vertical rib. The method of claim 1, Washing machine further comprises a horizontal rib connecting the vertical ribs. The method of claim 5, And said vertical ribs are symmetrical with respect to said horizontal ribs. The method of claim 5, Washing machine, characterized in that the horizontal rib has a drain hole. The method of claim 1, Washing machine, characterized in that each fastening portion is disposed opposite the other fastening portion. The method of claim 7, wherein Washing machine, characterized in that the other fastening portion is symmetrically arranged with respect to the fastening portion disposed opposite each fastening portion. The method of claim 1, And each fastening portion has a height higher than that of the vertical ribs. The method of claim 1, And the stator core is inserted into the insulator, the fastening part, and the connecting part by injection molding. 12. The method of claim 11, The stator core is a washing machine, characterized in that the through groove is formed so that the top and bottom of the insulator can be connected. The method of claim 12, And a gate part for injection molding is disposed to at least partially overlap the through hole. 14. The method of claim 13, The upper surface of the insulator is formed with a circumferential rib vertically along the circumferential direction, the washing machine, characterized in that located on the circumferential rib. 12. The method of claim 11, The gate part for injection molding is a washing machine, characterized in that spaced apart from the extension line of the line connecting the center of the fastening portion and the stator core. A stator core having a plurality of poles and a base; An insulator coupled to the stator core; A plurality of fastening portions each having a fastening hole through which the stator fastening bolt passes; A plurality of connecting portions having vertical ribs connecting the insulator to the respective fastening portions; Including, The stator for the electric motor, wherein the vertical ribs disposed on the extension lines of the poles closest to the vertical ribs among the vertical ribs are not aligned with the direction of the extension lines.

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