JPH09131494A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy and proper insulating means for a washing machine with a motor which has a stator covered with a mold resin without covering the bottom of an outer case. SOLUTION: A motor 9 covered with a mold resin 27 is installed on the outer bottom of an outer drum 3 via a motor mount 6. An anchor bolt 32 is inserted and fixed through a location hole 30 of a stator core 24 of the motor 9, and an earth connecting plate 33 is fixed by the bolt 32 as well. An earthing line 48 is connected to the plate 33. The line 48 is earthed via the mount 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine provided with a motor having a structure in which a stator is covered with a mold resin on the outer bottom of a tub arranged in an outer box.

[0002]

In recent years, in a washing machine, a stator is molded resin as a driving motor attached to the outer bottom of a water tank in an outer box in order to improve noise reduction especially during dehydration. The one covered by is adopted. Further, in the fully-automatic washing machine, since the water tank is held via the holding member during transportation, the area immediately below the motor is open.

By the way, in the washing machine of this kind, according to IEC which is an international standard, a portion which may be touched by hands is double-insulated from a charging part or earth connection (ground connection). ) Must have been done.

Further, the weight of the main body is 4 because the weight is relatively small and the above condition is confirmed.
When a washing machine of 0 kg or less is laid down sideways, the rotating shaft of the motor, the metal pulley attached to the rotating shaft, or the motor body can be easily touched through the opening directly below the motor. At this time, in order for the motor to be electrically safe, it must be double-insulated or grounded as described above.

However, a motor having a structure in which the stator is covered with the mold resin has a problem because it is not provided with means for connecting to the ground.

On the other hand, in order to reduce noise, a structure in which the bottom of the washing machine main body is covered with a synthetic resin lid is also commercialized. In the case of this product, the water tank is packed in a state of being held by a holding member from below during transportation, and when the user opens the packing, the attached lid is attached to the opening at the bottom of the washing machine. . However, since the user may forget to attach the lid, the safety is left to the user in terms of electrical insulation, which is not appropriate.

Therefore, an object of the present invention is to provide a motor having a structure in which a stator is covered with a mold resin on the outer bottom of a tank disposed in the outer box, without covering the bottom of the outer box. , To provide a washing machine which can easily take appropriate electric insulation means.

[0008]

In order to achieve the above object, the invention of claim 1 is a motor in which a stator is covered with a mold resin on the outer bottom of a tank disposed in an outer box. In a washing machine including: an anchor bolt inserted into a positioning hole formed in a stator core of the stator and attached, and the stator core and an earth connecting wire are electrically connected via the anchor bolt. It is a thing.

According to the above-mentioned means, the stator core of the motor is grounded via the anchor bolt and the grounding connecting wire. Therefore, the electric insulation means of the motor is taken without covering the bottom of the outer box. You can In this case, since the grounding connection is made using the positioning hole of the motor, it is not necessary to specially process the motor.

In this case, it is preferable that the stator mounting core is grounded by mounting the grounding mounting plate to the outside of the motor by the anchor bolt and electrically connecting the grounding connecting wire to the grounding mounting plate. Invention of Item 2).

In order to achieve the same object, a part of the stator core in the stator is exposed from the mold resin, and the ground connecting wire is electrically connected to the exposed portion of the stator core through a connecting tool. It can also be grounded (the invention of claim 3).

In order to achieve the same object, a fourth aspect of the present invention is to provide a motor mounting base made of a conductive material on the outer bottom portion of the tank arranged in the outer box, and a mounting portion for the motor mounting base. A washing machine equipped with a motor in which the stator is covered with a mold resin, and a part of a stator core of the stator is exposed from the mold resin in the motor mounting part, and the mounting part is the motor mounting base. It is characterized in that the exposed portion of the stator core and the motor mounting base are electrically connected to each other when being mounted to the motor via a fixture.

According to a fifth aspect of the present invention, between the motor mount and the metal portion exposed from the mold resin in the motor,
It is characterized in that the elastic body made of a conductive material is brought into contact with the elastic body.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, in FIG. 2 showing the overall configuration of the fully automatic washing machine, an outer tub 3 as a tub is elastically supported inside a steel plate outer box 1 via an elastic suspension mechanism 2. Has been done. In the outer tub 3, a rotary tub 4 for both washing and dehydration is arranged, and at the bottom of the rotary tub 4, an agitator 5 is arranged.

A motor mount 6 made of a metal plate made of a conductive material is attached to the outer bottom of the outer tub 3 with a screw 7, and a motor 9 is attached to the motor mount 6 via the mount 8. It is attached by a bolt 10 and is further provided with a mechanism portion 11 (see FIG. 3). The rotary shaft 12 of the motor 9 projects downward, and a pulley 14 having a fan 13 is attached to the rotary shaft 12.

A belt 17 is hung between the pulley 14 and a pulley 16 attached to the input shaft 15 of the mechanism section 11, and the rotational driving force of the motor 9 is transmitted to the mechanism section 11 via the belt 17. It is supposed to be done. The mechanical unit 11 is
Only the agitator 5 is rotated at a low speed in the forward and reverse directions during washing, and the rotating tub 4 and the agitator 5 are simultaneously rotated in one direction at a high speed during dehydration. A bottom plate 18 made of synthetic resin is provided in a lower portion of the outer box 1, and an opening 19 is formed in a portion of the bottom plate 18 corresponding to a lower portion of the motor 9 and the mechanism portion 11.

The motor 9 will be described with reference to FIGS.
Also, description will be made with reference to FIG. The motor 9 is the stator 2
0, and a rotor 22 which is provided with the rotating shaft 12 and is rotatably disposed on the stator 20 via upper and lower bearings 21. The stator 20 includes a stator core 24 formed by laminating a plurality of stator substrates 23 made of, for example, a silicon steel plate, and the stator core 24.
And a stator coil 26 wound around the slot 25, and the stator 20 is covered with an electrically insulating mold resin 27.
The upper bearing 21 is held by a metal bearing fitting 21a.

An insulating sheet 28 such as a polyester film is interposed in the inner peripheral portion of each slot 25, and the insulating sheet 28 electrically insulates the stator coil 26 and the stator core 24 from each other. A predetermined air gap 29 is secured between the inner peripheral surface of the stator core 24 and the outer peripheral surface of the rotor 22. In this case, the insulating sheet 2 is provided between the stator coil 26 and the rotor 22.
8 and the air gap 29 provide double insulation.

In the stator 20, as shown in FIG. 3, the portions corresponding to the four corners of the stator core 24 are
Positioning holes 30 used when the stator substrates 23 are stacked are formed. The positioning hole 30 is opened vertically. The mounting portion 8 projecting laterally is integrally provided at two locations on the mold resin 27 forming the outer shell of the motor 9. When mounting the motor 9 on the motor mounting base 6 at each mounting portion 8. Two bolt insertion holes 31 for inserting the bolts 10 are formed in each.

An anchor bolt 32 is attached to one of the four positioning holes 30 in the motor 9, and a ground attachment plate 33 made of a conductive material is attached to the anchor bolt 32. .

As shown in FIG. 5, the anchor bolt 32 is composed of a bolt member 34 and a cylindrical expanding member 35, both of which are made of a conductive metal. There is. Of these, the bolt member 34
Has a shaft portion 37 having a male screw portion 36 formed on the outer peripheral portion thereof and inserted into the expanding member 35, and a large-diameter head portion 38 provided at one end portion of the shaft portion 37. In addition, the expansion member 35
Is a tubular portion 39 having an internal thread portion formed so that the male thread portion 36 is screwed onto the inner peripheral portion of one end portion, a flange portion 40 provided at the other end portion, and a plurality of intermediate portion provided. It is composed of a book expanding portion 41. On the outer peripheral portion of the flange portion 40, rotation preventing tongue pieces 40a are formed at two locations.

The earth attachment plate 33 has an insertion hole 42 formed at the center thereof so that the expansion member 35 is inserted therethrough, and the tongue piece 40a is inserted at two locations on the outer periphery of the insertion hole 42. The rotation preventing hole 43 thus formed, the rotation preventing protrusion 44 formed at one location on the outer peripheral portion, and the mounting hole 45 formed on the opposite side of the rotation preventing protrusion 44. It is composed.

Therefore, the ground mounting plate 33 is connected to the motor 9
It is installed as follows. First, the expansion member 35 of the anchor bolt 32 is inserted into the insertion hole 42 of the ground attachment plate 33, and the flange portion 40 of the expansion member 35 is inserted.
The tongue piece 40a is inserted into the rotation stopping hole 43, and in this state, the shaft portion 37 side of the anchor bolt 32 is inserted into one positioning hole 30 in the motor 9. Then, the ground mounting plate 33 is applied to the outer surface of the mold resin 27 which is the outer shell of the motor 9. At this time, as shown in FIG. 3, the rotation preventing protrusion 44 of the ground mounting plate 33 is fixed to the mold resin 27.
To engage with one of the recesses 46 formed on the outer surface of the.

In this state, when the bolt member 34 is rotated in the tightening direction by a tool (not shown) such as a screwdriver, the tubular portion 39 of the expanding member 35 screwed into the male screw portion 36 is pulled toward the flange portion 40 side. (See arrow P in FIG. 5), and accordingly, the expanding portion 41 spreads outward and comes into pressure contact with the inner peripheral surface of the positioning hole 30, that is, the stator core 24 (see FIGS. 1 and 4). This allows
The ground mounting plate 33 is attached to the motor 9 by the anchor bolt 32.
Can be attached to the outside of. At this time, the stator core 24
And the ground attachment plate 33 are electrically connected via the anchor bolt 32.

A terminal 48a at one end of a ground connecting wire 48 is electrically connected to the ground mounting plate 33 by a screw 47 screwed into the mounting hole 45 of the ground mounting plate 33. The terminal 48b at the other end of the ground connecting wire 48 is electrically connected to the motor mount 6 by a screw 47. further,
The motor mount 6 is electrically connected to the outer box 1 via an intermediate connection wire 49 (see FIG. 2), and the outer box 1 is connected to the external ground wire 5
It is grounded through 0.

According to the first embodiment described above, the anchor bolt 32 is inserted into the positioning hole 30 of the stator core 24 in the motor 9 having the structure covered with the mold resin 27, and the motor 9 is fixed by the anchor bolt 32. The ground connecting line 48 is connected to the ground mounting plate 33 attached to the outside, and the ground connecting line 48 is grounded via the motor mount 6, the intermediate connecting line 49, and the external connecting line 50. The electric insulating means of the motor 9 can be provided without covering the opening 19 of the bottom plate 18.

In this case, since the positioning hole 30 of the motor 9 is used for ground connection, there is an advantage that the motor 9 need not be specially processed.

Moreover, in the case of this, the anchor bolt 3
2 is used to attach the ground attachment plate 33 to the outside of the motor 9, and the ground connection wire 48 is attached to the ground attachment plate 33 with the screw 4
Since it is configured to be connected by 7, the motor 9
In order to remove the motor 9 for replacing the motor 9, the screw 47 is loosened from the ground mounting plate 33 to remove the ground connection wire 48, and then the bolt 10 is loosened from the motor mounting base 6 to remove the motor 9. Well, there is an advantage that the motor 9 can be easily replaced without removing the anchor bolt 32.

In the first embodiment described above, the terminal 48a at one end of the ground connecting wire 48 is connected to the anchor bolt 3.
It is also possible to have a configuration in which it is directly connected to the No.

6 and 7 show a second embodiment of the present invention. This second embodiment differs from the above-mentioned first embodiment in the following points. That is, in the stator 20 of the motor 9, the exposed portion 51 where a part of the stator core 24 is exposed from the mold resin 27 is provided in the portion corresponding to the periphery of the positioning hole 30, and the terminal 48 a of the ground connection wire 48 is provided.
By inserting the bolt 52 into the hole and the positioning hole 30 and screwing the nut 53 into the bolt 52, the terminal 48a of the ground connection wire 48 is brought into fixed contact with the exposed portion 51. Here, the bolt 52 and the nut 53 constitute a connecting tool that electrically connects the exposed portion 51 and the terminal 48 a of the ground connecting wire 48. in this case,
A spring washer 54 for preventing loosening is interposed between the head portion 52a of the bolt 52 and the terminal 48a.

Also in this second embodiment, the bottom plate 1
It is possible to provide an electrical insulation means for the motor 9 without covering the opening 19 of the motor 8. Further, in this case, since the exposed portion 51 of the stator core 24 and the terminal 48a of the ground connecting wire 48 are in direct contact with each other, there is an advantage that a separate component such as a ground mounting plate can be eliminated.

FIG. 8 and FIG. 9 show a third embodiment of the present invention, which is different from the first embodiment in the following points. That is, the protrusion 55 is integrally provided on a part of the stator substrate 23 of the stator core 24, and the protrusion 55 is provided on the side of the motor 9 in the mold resin 2.
It is exposed from 7. Therefore, in this case, the protrusion 55 constitutes an exposed portion. And this protruding portion 55
Has a mounting hole (not shown) formed therein, and the screw 57 inserted into the hole of the terminal 48a of the ground connecting wire 48 is screwed into the mounting hole, whereby the terminal 48a of the ground connecting wire 48 is formed.
Is in fixed contact with the protrusion 55. in this case,
The screw 57 is connected to the protrusion 55 and the terminal 48 of the ground connecting wire 48.
It constitutes a connector for electrically connecting with a.

Also in the third embodiment as described above, it is possible to obtain the same effect as that of the second embodiment.

FIGS. 10 and 11 show a fourth embodiment of the present invention, which is different from the first embodiment in the following points. That is, the protrusion 58 is integrally provided on a part of the stator substrate 23 in the stator core 24, and the protrusion 58 is attached to the mold resin 2 at the mounting portion 8.
It is exposed from 7. Then, the bolt insertion hole 59 formed in the protruding portion 58 and the bolt insertion hole 3 of the mounting portion 8
The mounting portion 8 is fixed to the metal motor mounting base 6 by screwing a bolt 10 as a fixture inserted into the mounting hole 1 into the mounting hole 6a of the motor mounting base 6.

In this case, the protruding portion 58 of the stator substrate 23, which is the exposed portion of the stator core 24, and the motor mount 6 are electrically connected via the bolt 10. The motor mount 6 is similar to the first embodiment in that the intermediate connecting line 49
It is connected to the outer box 1 via (see FIG. 2).

According to such a fourth embodiment, the motor 9
Since the stator core 24 and the motor mounting base 6 are electrically connected by using the mounting bolts 10,
There is an advantage that the number of parts can be further reduced and the assembling cost can be further reduced.

FIG. 12 shows a fifth embodiment of the present invention, which is different from the first embodiment in the following points. That is, one end 60a of the elastic body 60 made of a metal plate leaf spring, which is a conductive material, is attached and fixed to the metal motor mounting base 6 with the screw 61, and the other end portion 60b of the elastic body 60 is Metal bearing fitting 2 which is a metal portion exposed from the mold resin 27 in the motor 9.
It is pressed against the upper surface of 1a. In this case, the bearing fitting 21 a of the motor 9 and the motor mount 6 are electrically connected via the elastic body 60. The motor mount 6 is connected to the outer case 1 via an intermediate connecting wire 49 (see FIG. 2), as in the first embodiment.

Further, in this case, the mounting position of the motor 9 may be displaced due to the tension of the belt 17 or the like. Even if the mounting position of the motor 9 is slightly displaced, the other end 60b of the elastic body 60 and the motor 9 are displaced. The bearing metal fitting 21a is in contact with.

According to such a fifth embodiment, the motor 9
Since the bearing fitting 21a and the motor mounting base 6 are electrically connected via the elastic body 60 mounted on the motor mounting base 6, for example, when the motor 9 is removed to replace the motor 9. To remove the elastic body 60, simply remove the bolt 10 (see FIG. 1 etc.) to which the motor 9 is attached.
There is no need to remove the or ground connection line, and it has the advantage of good workability during assembly. The elastic body 60 is
You may make it attach to the bearing metal part 21a side of the motor 9.

[0040]

According to the first aspect of the invention, the stator core of the motor and the ground connecting wire are electrically connected via the anchor bolts inserted into the positioning holes of the stator core. Appropriate electrical insulation measures can easily be taken without covering the bottom. Further, since the grounding connection is made using the positioning hole of the motor, it is not necessary to specially process the motor.

According to the second aspect of the invention, the earth mounting plate is attached to the outside of the motor by the anchor bolt, and the earth connecting line is connected to the earth mounting plate. Therefore, for example, the motor is replaced to replace the motor. When removing the motor, the motor may be removed after removing the ground connection wire from the ground mounting plate, which has an advantage that the motor can be easily replaced without removing the anchor bolt.

According to the third aspect of the invention, the exposed portion of the stator core and the ground connecting wire are electrically connected to each other.
There is an advantage that separate parts such as a ground mounting plate can be eliminated.

According to the fourth aspect of the present invention, since the stator core and the motor mounting base are electrically connected to each other by utilizing the fixing member for mounting the motor, the number of parts can be further reduced and the assembling cost can be reduced. There is an advantage that it can be further reduced.

According to the fifth aspect of the invention, the motor mount and the metal part of the motor are electrically connected via the elastic body made of a conductive material. Therefore, for example, when the motor is replaced. Therefore, it is possible to eliminate the need to attach and detach the elastic body and the ground connecting wire.

[Brief description of the drawings]

FIG. 1 is a cutaway side view of essential parts showing a first embodiment of the present invention.

[Fig. 2] Side view of the washing machine as a whole

FIG. 3 is a bottom view of the main part

FIG. 4 is a cross-sectional view of the main part

FIG. 5 is a perspective view of an anchor bolt and a ground mounting plate.

FIG. 6 is a bottom view of essential parts showing a second embodiment of the present invention.

FIG. 7 is a vertical sectional view taken along the line AA in FIG.

FIG. 8 is a bottom view of essential parts showing a third embodiment of the present invention.

9 is a vertical cross-sectional view taken along the line BB in FIG.

FIG. 10 is a bottom view of essential parts showing a fourth embodiment of the present invention.

11 is a vertical sectional view taken along the line CC in FIG.

FIG. 12 is a vertical cross-sectional view of a main part showing a fifth embodiment of the present invention.

[Explanation of symbols]

1 is an outer box, 3 is an outer tank (tank), 6 is a motor mount, 8 is a mounting portion, 9 is a motor, 10 is a bolt (fixing tool), 19 is an opening, 20 is a stator, 21a is a bearing fitting ( Metal part),
22 is a rotor, 23 is a stator substrate, 24 is a stator core, 27 is a mold resin, 30 is a positioning hole, 32 is an anchor bolt, 33 is an earth mounting plate, 48 is a ground connection line, 49 is an intermediate connection line, and 50 is an external ground. A wire, 51 is an exposed portion, 52 is a bolt (connecting tool), 53 is a nut (connecting tool), 55 is a protruding part (exposing part), 57 is a screw (connecting tool), 58 is a protruding part (exposed part), 60 Is an elastic body.

Claims (5)

[Claims] 1. A washing machine having a motor having a structure in which a stator is covered with a mold resin on an outer bottom portion of a tub arranged in an outer box, wherein the stator is inserted into a positioning hole formed in a stator core of the stator. Equipped with anchor bolts
The washing machine characterized in that the stator core and the ground connecting wire are electrically connected via the anchor bolt. 2. A washing machine having a motor having a structure in which a stator is covered with a mold resin on an outer bottom portion of a tub arranged in an outer box, wherein the stator is inserted into a positioning hole formed in a stator core of the stator. Equipped with an anchor bolt and a ground attachment plate that is attached to the outside of the motor by the anchor bolt and is electrically connected to the stator core via the anchor bolt. Washing machine characterized by being physically connected. 3. A washing machine comprising a motor having a structure in which a stator is covered with a mold resin on an outer bottom of a tub arranged in an outer box, wherein a part of a stator core of the stator is exposed from the mold resin. And a grounding wire is electrically connected to the exposed portion of the stator core through a connecting tool. 4. A motor mounting base made of a conductive material, and a motor mounting base mounted on the motor mounting base via the mounting part, wherein the stator is covered with a mold resin. A washing machine equipped with the motor according to claim 1, wherein a part of a stator core of the stator is provided in the mounting portion of the motor exposed from the molding resin, and the mounting portion is mounted on the motor mounting base via a fixture. A washing machine characterized in that an exposed portion of the stator core and a motor mount are electrically connected. 5. A structure in which a motor mount made of a conductive material is attached to the outer bottom of a tank arranged in the outer box, and the stator is attached to the motor mount via the mount and the stator is covered with a mold resin. A washing machine equipped with the motor according to claim 1, wherein the motor mount and the metal portion of the motor exposed from the mold resin are brought into contact with each other through an elastic body made of a conductive material. Machine.