JPH0775280A - Molded motor and its disassembling method - Google Patents

Abstract

PURPOSE:To easily reutilize a core, a winding etc., which are values enclosed by a molding material on disposal. CONSTITUTION:A core 7 and a coil winding 6 are subjected to mold forming in one piece using a molding material 8 containing at least a biodegradable material as a binder material, a stator 1 is buried into an activated sludge, soil, etc., for a certain period for reducing the strength of molding and then the molding material 8 is eliminated and values are taken out.

Description

Detailed Description of the Invention

[0001]

The present invention relates to consumer equipment, industrial equipment,
The present invention relates to a molded motor used for office equipment and the like, and particularly to a molded motor that can be easily disposed of after use and a disassembling method thereof.

[0002]

2. Description of the Related Art In recent years, the use of molded motors in consumer equipment, industrial equipment, office equipment, etc. has been rapidly expanding. As a stator of a mold motor used for an AC motor of this type, a brushless DC motor, etc., a structure generally shown in, for example, JP-A-61-214740. The configuration will be described with reference to FIGS. 6 and 7. FIG. 6 is a perspective view showing the appearance of a conventional stator of a molded motor, and FIG. 7 is a perspective view showing the structure of a stator temporary assembly before being molded. In FIG. 7, the stator core 101 having slots has an ink insulator 10
The stator winding 103 is wound via the wire 2. Also,
At the upper end of the ink insulator 102, the stator winding 10
A printed circuit board 106 having a wiring pattern 105 for connecting the terminal portion of No. 3 and the lead wire 104 (shown in FIG. 6).
Is installed. The temporary assembly of the stator thus configured is inserted into a mold or the like, and resin is injected into the space of the mold and solidified. As a result, as shown in FIG.
A mold material 107 having the same shape as the shape of the space of the mold is formed on the outer peripheral portion of the mold 1. Then, the wiring pattern 10
The lead wire 104 is connected to 5 and the stator is completed.

As a material for the molding material 107, for example, a thermoplastic resin such as polyethylene terephthalate, polyethylene, polypropylene or nylon, or a thermosetting resin such as unsaturated polyester, vinyl ester resin or phenol resin is used as a binder material, and further calcium carbonate is used. A material to which an additive such as talc, carbon black or the like is added is used. Motors molded in this way are rapidly becoming popular because they have excellent maintainability and quietness and are easy to automate during manufacturing.

[0004]

The stator of the conventional molded motor configured as described above is a composite material in which the valuable metals such as the iron core 101 and the winding 103 are tightly wrapped with the molding material 107. Is. Therefore, when the use of the mold motor is finished and the stage is to be discarded, a large amount of incombustibles damages the incinerator, so that the stator cannot be incinerated and must be treated as landfill. Further, in the landfill treatment, the conventional molding material does not decompose spontaneously and remains in the ground as it is, which causes a problem that the ground of the landfill is not stable. In addition, silicon steel plates and copper wires used for iron cores, windings, etc. are said to be unusable after being used as a motor, even though they are highly valuable as recycled materials because they are surrounded by mold material. There were also problems. The present invention has been made to solve the above problems, and provides a molded motor and its disassembling method in which valuable materials such as an iron core and a winding can be easily reused after being used as a motor. It is an object.

[0005]

In order to achieve the above object, in the molded motor of the present invention, the core and the winding are integrally molded using a molding material containing at least a biodegradable material as a binder material. Is configured.
In the above structure, a portion that directly contacts the iron core and the winding and a portion near the surface of the molded motor are molded by different first and second molding materials, and a binder is applied to the second molding material near the surface of the molded motor. It is preferable that the composition ratio of the biodegradable material included as a material is smaller than the composition ratio of the biodegradable material included in the first molding material in the portion that directly contacts the iron core and the winding. Further, it is preferable that at least a portion around the winding is molded with a molding material using only a biodegradable material as a binder material. Further, it is preferable that a non-biodegradable material is included as a binder material of the molding material, and the non-biodegradable material is molded into a porous shape. Further, the non-biodegradable material is preferably a thermosetting resin. Further, it is preferable that the molding material contains a hydrophilic biodegradable material having a hydroxyl group, a melamine resin and / or glyoxal. on the other hand,
A method of disassembling a molded motor according to the present invention is a method of disassembling a molded motor molded using a molding material containing at least a biodegradable material in an environment in which a microorganism decomposing the biodegradable material is present. After leaving until the parts are disassembled, the remaining molding material is removed to take out the iron core and / or the winding.
In the above configuration, it is preferable to perform processing so that the microorganisms can directly contact at least a part of the molding material in a portion that directly contacts the iron core and the winding before leaving the molded motor in an environment where microorganisms exist. .

[0006]

[Function] Since the molding material contains a biodegradable material,
After being used as a motor, the biodegradable material is left in an environment in which microorganisms that decompose the biodegradable material are present, and at least a part of the mold material is decomposed by the microorganisms, and the mechanical strength of the mold material is greatly reduced. After disassembling over a certain period of time, the mold material can be easily removed, and valuable materials such as the iron core and windings wrapped in the mold material can be easily taken out, and these valuable materials can be recycled. can do. Further, even when the used mold motor is landfilled, the mold material is gradually decomposed by the microorganisms, so that the ground of the landfill is easily stabilized and the landfill is easily used.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> A preferred first embodiment of the molded motor and its disassembling method of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the external appearance of a molded motor which is an AC motor (or a brushless DC motor) in the first embodiment, and FIG. 2 is a sectional view showing its configuration. 1 and 2, the molded motor includes a stator 1, a bracket 2, a rotor 3, a flange portion 4 having a plurality of mounting holes 5 for mounting a chassis, a stator winding 6 for energizing, and a stator core 7. , A molding member 8, a rotor shaft 9 that forms a part of the rotor 3, a bearing 10 that pivotally supports one end of the shaft 9, and the like. The mold member 8 contains a biodegradable material as a binder material, molds the stator winding 6 and the stator core 7, and constitutes the stator 1. In addition, in this embodiment, an example in which the flange portion 4 is integrally formed of a molding material is shown.
As in the conventional example shown in FIG. 6, the flange portion 4 may be omitted.

The molding material 8 contains at least a biodegradable material as a binder material. A biodegradable material is a material that is decomposed by microorganisms when it is naturally discarded.
TM (American standard test method) G21-70 (1985
Reapproved) means a grade 3 or grade 4 test method. For comparison, polystyrene resin and polyethylene resin were used to evaluate the degree of growth of the microorganisms, and grades 1 and 2 were used. Grades 3 and 4 were those grown by culturing more microorganisms (molds). Say what is degree.

As the biodegradable material, for example, polyester (poly (3.hyd) containing 3-hydroxybutyrate as a unit is used.
roxybutyrate)) and other synthetic polyesters produced by microorganisms, and copolyesters (poly (3.hyd) containing 3-hydroxybutyrate and 3-hydroxyvalerate units.
roxybutyrate-CO-3 ・ hydroxyvalerate)), a copolyester consisting of units of 3-hydroxybutyrate and 4-hydroxybutyrate (poly (3 ・ hydroxybutyrate-CO-
4 ・ hydroxybutyrate)), a copolyester consisting of 3-hydroxyalkanoate units (Copoly (3 ・ hydroxybutyrate))
alkanolate)) and other microorganism-produced synthetic copolyesters, bacterial cellulose, dextran, pullulan, curdlan, xanthan gum, gellan gum and other polysaccharides, ε-polylysine, γ-polyglutamic acid, poly-γ-methyl-L-glutamate. Polyamino acids such as, corn starch, potato starch,
Starch such as modified starch, wood fiber, hemp, cellulose such as cotton cellulose, polyethylene adipate,
Aliphatic polyesters such as polycaprolactone and aqueous thermoplastic resins such as chitin, chitosan, polyethylene glycol and polyvinyl alcohol can be used.

As the binder material of the molding material 8, not only the above-mentioned biodegradable materials but also thermoplastic resins such as polyethylene, polypropylene, polystyrene, vinyl acetate resin, polymethylmethacrylate ethylene vinyl alcohol resin, unsaturated polyester, polyurethane. (Some have an average molecular weight of less than 8,000 and show biodegradability),
A non-biodegradable material such as a thermosetting resin such as a phenol resin or a melamine resin may be used.

In addition to the binder material described above, the molding material 8 is used to improve mechanical strength during molding.
Calcium carbonate, carbonate such as magnesium carbonate, calcium sulfate, barium sulfate, (sulfite) such as calcium sulfite, clay, mica, glass balloon, montmorillonite, silicates such as silicic acid, kaolin and talc, silica, silica Dry soil, iron oxide, pumice balloon, titanium oxide, oxides such as alumina, hydroxides such as aluminum hydroxide and magnesium hydroxide, inorganic fillers such as graphite, glass fiber, carbon fiber and asbestos fiber, and wood powder , Shell fibers such as rice husks, organic fillers such as cotton, paper strips, nylon fibers, and wood cellulose may be included. Further, the molding material 8 includes polyhydric alcohols such as glycerin and polyethylene oxide, polyhydric alcohol esters, higher alcohol ethylene oxide adducts, ethylene oxide adducts of alkylphenols, polyethylene glycol esters of higher fatty acids, and higher fatty acid amides. Non-ionic antistatic agent, mixed with silicone lubricant, oleic acid amide lubricant, stearic amide lubricant, polyethylene wax, hydrocarbon lubricant such as paraffin, fatty acid lubricant, phthalate ester, glycol ester A plasticizer such as, a silane coupling agent, or the like may be appropriately mixed.

When a hydrophilic material is used as the biodegradable material, even if the molding material 8 adheres to the valuables taken out (the stator core 7 and the stator winding 6), it swells with water or warm water. Can be removed by washing, and the disassembly process becomes easier. However, since these hydrophilic materials are inferior in water resistance, when a hydrophilic biodegradable material having a hydroxyl group, for example, one in which a polysaccharide or starch is dispersed in modified PVA is used, water resistance is added. , Melamine resin and / or glyoxal is mixed into the molding material 8,
It is necessary to crosslink at least a part of the surface during molding to improve the water resistance of at least the surface of the stator 1. When the above-mentioned non-biodegradable material is used as the binder material of the molding material 8, at least the biodegradable material is molded so as to be continuous in the thickness direction so that the progress of decomposition by microorganisms naturally penetrates into the interior. For example, the non-biodegradable material is formed into a porous shape, and the biodegradable material is arranged in a hole penetrating in the thickness direction.

In order to improve the storability during use of the product, foods such as paraoxybenzoic acid, esters of paraoxybenzoic acid, benzoic acid, sorbic acid, benzoate, sorbate, and propionate are used as the molding material 8. Preservatives approved for use as additives, amitraz agents, isoxathion agents, ethiophene carb agents, etocarbosulfane agents, chlorobenzilate agents, pesticides such as marathon agents,
A sodium arginate agent, an iprodione agent, an ecromezole agent, an oxadixyl agent, a dithianon agent, a thiadiazine agent, or another bactericide, a chlorofacinone agent, or another socidal agent may be added as appropriate. However, in order not to impair biodegradability after use as a motor, these agents must be arranged so as to be distributed in large amounts on the mold surface.

In the following, with respect to the first embodiment, a manufacturing / disassembly experiment of the stator 1 was performed on the molded motor shown in FIG. 1, and the results will be described in detail. The composition of the molding material 8 is not limited to these.
In the following experiments, first, a silicon steel plate of the stator core 7 wound with a copper wire (stator winding 6) having an enamel coating was molded with various molding materials 8, and then the garden soil (30
It was left for 6 months to confirm the biodegradability, and it was further confirmed whether or not the molded valuable silicon steel plate and copper wire could be taken out manually. The molding is the same as the conventional method. First, a silicon steel plate wound with a copper wire is placed in a molding die, and the molding material 8 is injected into the die while being heated to 150 to 180 ° C. Then, the stator 1 was cooled and prototyped. The thin part of the mold was about 1 mm, and the thickest part was about 5 mm.

<Experimental Example 1> 40 parts by weight of a mold material 8 of biodegradable plastic (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: Mater Bee) in which starch is dispersed in denatured polyvinyl alcohol, median particles 50 parts by weight of calcium carbonate having a diameter of about 5 μm and 10 parts by weight of glass fiber having a diameter of about 0.5 mm were constituted. After confirming the biodegradability of the mold motor (stator) after leaving it in the horticultural soil, the thin part of the mold material was almost decomposed, and the thick part was about half the thickness. It had been disassembled. In this state, the molding material 8 can be almost removed from the surface of the silicon steel plate or the winding by manual work, and the valuable metals can be easily taken out. Further, although some biodegradable plastic was attached to the metals taken out, since they were hydrophilic, they could be softened by warm water and easily removed by washing.

<Experimental Example 2> 30 parts by weight of the mold material 8 was biodegradable plastic (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: Mater Bee) in which starch was dispersed in modified polyvinyl alcohol, and methylated. 10 parts by weight of melamine resin (Sumitomo Chemical Co., Ltd., trade name: Sumimar), 50 parts by weight of calcium carbonate having a median particle size of about 5 μm, and 10 parts by weight of glass fiber having a diameter of about 0.5 mm. Configured to. After confirming biodegradation of the mold motor (stator) after leaving it in activated soil, the thin part of the mold material was decomposed into a porous material, and the thick part was about half the thickness. By the way, it was decomposed by opening pores in a porous form. In this state, most of the molding material 8 could be manually removed, and the valuable metals could be easily taken out. In addition, although a small amount of biodegradable plastic was attached to the metals taken out, since it was hydrophilic, it could be swollen by warm water and scraped off. In Experimental Example 2, since polyvinyl alcohol was partially cross-linked using the melamine resin, the mold material 8 contained a portion that could not be biodegraded, and it is considered that the porous material had porous holes even after biodegradation. . However, the mechanical strength and water resistance are greatly improved by partially crosslinking the hydrophilic hydroxyl groups with the melamine resin, so that the molded motor can be used over a wide range. Further, similar results could be obtained by using glyoxal (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) instead of the melamine resin used in this Experimental Example 2.

<Experimental Example 3> 30 parts by weight of a molding material 8 of a copolyester of β-hydroxybutyric acid and β-hydroxyvaleric acid (manufactured by ICI, trade name: Biopol), and a median particle size of about 30 50 parts by weight of 5 μm calcium carbonate and 10 parts by weight of glass fiber having a diameter of about 0.5 mm were used. When the biodegradation of the mold motor after being left in the activated soil was confirmed, it was confirmed that the thin part of the molding material had a partial hole and the biodegradation was progressing. However, the decomposition has not progressed to the extent that the molding material 8 can be peeled off only by manual work.
Therefore, when the decomposition rate was accelerated by further leaving it in the heated compost for one month, the mold material 8 was manually removed, and the decomposition could proceed to such an extent that the valuable metals could be taken out. In Experimental Example 3, since a water-resistant thermoplastic polyester resin is used as the biodegradable material, it can be used even in a place having a higher humidity than the composition shown in Experimental Example 2.

<Experimental Example 4> 20 parts by weight of a molding material 8 of a copolyester of β-hydroxybutyric acid and β-hydroxyvaleric acid (manufactured by ICI, trade name: Biopol), unsaturated polyester (Showa era) Polymers Co., Ltd., trade name: Rigolac, 10 parts by weight, median particle size of about 5μ
50 parts by weight of calcium carbonate of m, and 10 parts by weight of glass fiber having a diameter of about 0.5 mm. Similar to Experimental Example 3, the biodegradability was confirmed by leaving it in horticultural soil and then leaving it in the heated compost for 1 month. Although not as great as in Experimental Example 3, the mold material had porous holes, and the mold material 8 could be almost removed by hitting with a hammer, and there was no problem in taking out valuable materials.
In the structure of this Experimental Example 4, since the thermoplastic resin (which is also biodegradable) polyester is mixed while being thermally crosslinked with the unsaturated polyester, the heat shrinkage at the time of molding is small and the dimensional stability is also high. Good and easy to manufacture. That is, when a thermosetting resin is used as the non-biodegradable material and a thermoplastic resin is used as the biodegradable material, the dimensional stability is good. In the case of Experimental Example 2, the dimensional stability was also better than in the case of Experimental Example 1 and the same effect was obtained, but the thermal contraction rate seemed to be smaller in this Experimental Example. Further, since it is crosslinked, it has a high mechanical strength and can be used in a state in which the molding material 8 is thinner than in the case of Experimental Example 3, and mixing a thermosetting resin also contributes to saving resources. preferable.

With respect to the molded motors prototyped with the configurations shown in the above Experimental Examples 1 to 4, the stator 1 was cut off with an electric saw before being left in the soil for gardening, and the sludge was valuable from the beginning. 7 and the part of the molding material 8 that is in direct contact with the stator winding 6 were treated so as to be in direct contact therewith and left to stand, the biodegradable decomposition rate was high, and the separation of valuables was even easier. .

<Second Embodiment> The configuration of a second preferred embodiment of the molded motor and its disassembling method of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is a partial cross-sectional view showing the structure of the molded motor according to the second embodiment, and FIG. 4 is a flowchart showing the disassembling procedure. In FIG. 3, the stator core 7 and the stator winding 6 are thinly wrapped with the first molding material 8a, and further the second molding material 8b is used to seal the stator 1.
Is molded as a structure. At this time, the ratio of the biodegradable material contained in at least the first molding material 8a is larger than the ratio of the biodegradable material contained in the second molding material 8b. Therefore, the structural strength and storability of the stator 1 are achieved by the second molding material 8b.

Regarding the biodegradation of the molding material, see, for example, FIG.
Even if the biodegradation in the thickness direction of the second molding material 8b is partially caused in the thin mold portion 11 shown in FIG.
At that time, the biodegradation around the stator core 7 and the winding 6 can proceed more than the biodegradation from the surface of the stator 1 at that time. Therefore, even if biodegradation does not proceed sufficiently on the entire surface, if biodegradation progresses partially, biodegradation progresses internally, for example, by simply cutting the stator 1 into both sides,
The iron core 7 and the winding wire 6 can be easily taken out.

As shown in FIG. 3, the first molding material 8a
Since the second mold material 8b is covered with the second mold material 8b, heat resistance is required so that the second mold material 8b does not flow or decompose during molding. Since the temperature at which the first molding material 8a comes into contact with the second molding material 8b is about 120 ° C., the first molding material 8b
The biodegradable material used in a is 12 even if the melting point is 120 ° C. or higher or the glass transition is lower than 120 ° C. among the above-mentioned substances.
Use one having a viscosity of 1000 Pa · s or more at 0 ° C. As a biodegradable material satisfying this heat resistance condition, from the above, for example, microorganism-produced synthetic polyesters, polysaccharides, polyamino acids, starches, celluloses, aliphatic polyesters, chitin, chitosan,
Polyvinyl alcohol or the like can be used. However, in order to improve the wettability to the stator core 7 and the stator winding 6, various kinds of surfactants are added, and in order to improve the thixotropy at the time of heating viscosity, the inorganic filler as described above is added. Alternatively, an organic filler may be added.

FIG. 4 shows an example of the disassembling procedure of the stator 1 having the structure shown in FIG. In this disassembly procedure, first, the stator 1 is cut into both sides (step 1001). The cut pieces are left in a biodegradable environment such as activated sludge and horticultural soil (step 1002). This leaving time is the time required until the valuable materials (iron core and winding) inside the mold can be taken out (step 1003). Then, the valuable material taken out from the inside of the molding is reused (step 10).
04). The undecomposed mold material 8b can also recover energy as fuel. According to this disassembly example, since the biodegradation proceeds from the cut surface, the stator 1
It is not always necessary to add biodegradability to the second molding material 8b, which is a direct structural body. Therefore, the reliability of the molded motor can be easily improved, and the productivity can be easily increased.

In the disassembling procedure shown in FIG. 4, a method has been shown in which the stator 1 is cut into two pieces as a pretreatment for biodegradation so that microorganisms are likely to come into direct contact with the first molding material 8a inside the molding. For example, a hole is partially opened, soil in which many microorganisms are growing is pushed into this hole, it is hit with a hammer to cause cracks inside, and a hydrophilic biodegradable material is used. In this case, treatment may be performed such that hot water or steam is allowed to swell for a certain period of time so as to allow microorganisms to easily enter from the cut surfaces.

In the following, with respect to the second embodiment, a manufacturing / disassembling experiment of the stator 1 was performed on the molded motor shown in FIG. 3, and the results will be described in detail. The compositions of the first and second molding materials 8a and 8b are not limited to these. First, a silicon steel plate of the stator core 7 wound with a copper wire (stator winding 6) having an enamel coating is thinly molded with various first molding materials 8a,
After that, final molding was performed using the second molding material 8b to form the stator 1. Then, the state in which the stator 1 was cut off was left in the soil for gardening for 6 months to confirm the biodegradability, and the molded valuable silicon steel plate and copper wire were taken out by hand. Done in work. This two-step molding is the same as the conventional method. First, a silicon steel plate with a copper wire wound therein is placed in a mold and each of the first and second molding materials 8a and 8b is set to 150.
It was carried out by extruding while being heated to ˜180 ° C. and then cooling. The final thickness of the molded product is about 1m at a thin place.
m, about 5 mm at the thickest part. In addition, the molded motor configured by the following experimental example is the stator 1
Since the biodegradable material contained in the second molding material 8b forming the surface part of the is extremely smaller than that of the first molding material 8a inside, use in a place where humidity is high and water is likely to splash Can withstand even a long time.

<Experimental Example 5> A biodegradable plastic in which starch was dispersed in modified polyvinyl alcohol (trade name: manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was used as the first molding material 8a.
40 parts by weight of mater bee) and 10 parts by weight of calcium carbonate having a median particle size of about 5 μm. Mold material 8b
Is 10 parts by weight of the same biodegradable plastic, 20 parts by weight of a methylated melamine resin (Sumitomo Chemical Co., Ltd., trade name: Sumimar), 60 parts by weight of calcium carbonate having a median particle size of about 5 μm, A glass fiber having a diameter of about 0.5 mm was made to be 10 parts by weight. The stator 1 created in this experimental example has a temperature of 50 ° C. and a relative humidity of 80%.
It could be used stably for 00 hours and had good moisture resistance. Moreover, although the surface of the horticultural soil that had been left as it was tended to be slightly decomposed into a porous state, the decomposition did not seem to have progressed to the inside, and it was not long enough to take out valuables. It seemed necessary to leave it for a while.
On the other hand, as in the disassembling procedure shown in FIG. 4, in the case of being cut into two pieces and left, the silicon steel plate and the winding are almost disassembled,
It was possible to separate using a hammer and a screwdriver. In addition, if the stator 1 that has been cut into two pieces is immersed in warm water for 1 hour,
It was found that the degree of decomposition was faster than that without any pretreatment, and was preferable as a pretreatment for biodegradation.
In Experimental Example 5, 35 parts by weight of a biodegradable plastic (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: Mater Bee) in which starch was dispersed in modified polyvinyl alcohol was methylated as the first molding material 8a. When 5 parts by weight of melamine resin (Sumitomo Chemical Co., Ltd., trade name: Sumimar) and 10 parts by weight of calcium carbonate having a median particle size of about 5 μm were cut by the decomposition procedure shown in FIG. However, it exhibits sufficient decomposability, and at the time of additional molding using the second molding material 8b, the first molding material 8
a did not flow, and the productivity was good as compared with the case where the melamine resin was not used for the first molding material 8a.

Experimental Example 6 Polyvinyl alcohol having an average molecular weight of about 50,000 (Kuraray Co., Ltd.) was used as the first molding material 8a.
Manufactured by trade name: Poval), and the second molding material 8b contains 10 weight of a copolyester of β-hydroxybutyric acid and β-hydroxyvaleric acid (manufactured by ICI, trade name: Biopol). Part, 20 parts by weight of unsaturated polyester (trade name: Rigolac, manufactured by Showa High Polymer Co., Ltd.), 60 parts by weight of calcium carbonate having a median particle size of about 5 μm,
A glass fiber having a diameter of about 0.5 mm was made to be 10 parts by weight. In Experimental Example 6, the water resistance was higher than that in Experimental Example 5, and the mechanical strength was sufficient. In Experimental Example 6, when the stator 1 was left as it was, the progress of biodegradability was slower than in Experimental Example 5, and the surface was hardly changed. However, according to the disassembling procedure shown in FIG. 4, when the stator was cut into two pieces and left to stand, the silicon steel plate and the surroundings of the winding were almost decomposed, and it was possible to separate using a screwdriver while striking with a hammer. In the case of molding only with polyvinyl alcohol as in Experimental Example 6, the average molecular weight is 2 in view of biodegradability.
It is preferable to use 10,000 to 90,000. Also in this case, as described in Experimental Example 5, by slightly adding the melamine resin to the first molding material 8a, the production stability when molding the second molding material 8b was improved.

<Experimental Example 7> A biodegradable plastic in which starch is dispersed in modified polyvinyl alcohol (trade name: manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) is used as the first molding material 8a.
40 parts by weight of mater bee) and 10 parts by weight of calcium carbonate having a median particle size of about 5 μm. The second molding material 8b was 30 parts by weight of unsaturated polyester (trade name: Rigolac, manufactured by Showa Polymer Co., Ltd.), 60 parts by weight of calcium carbonate having a median particle size of about 5 μm, and a diameter of 0.5 mm. About 10 parts by weight of glass fiber was constituted. After confirming the biodegradation of the mold motor after leaving it in the activated soil, the second mold 8
Although the part b is not decomposed at all, the part of the first molding material 8a has been decomposed, so that the surface of the stator core 7 exposed is hit with a hammer to remove the second molding material 8b. It was possible to easily take out valuable metals such as metals. Furthermore, in Experimental Example 7, the first molding material 8a was made of polyvinyl alcohol (Kuraray Co., Ltd.,
Commodity name: Poval) and polyethylene oxide (manufactured by Steel Chemical Industry Co., Ltd., product name: PEO)
Two stators 1 having the same composition as the molding material 8b were prototyped. In this case as well, with respect to the substance that was biodegraded by cutting it into two parts, the biodegradation greatly progressed around the metals, and it was possible to easily take out the valuable metals with a hammer.

In Experimental Examples 5 to 7, it is possible to take out valuables while tapping 7 parts of the stator core with a hammer, after immersing the sample in warm water for about 5 hours without biodegradation and allowing it to swell sufficiently.
I was able to deal with the case where I wanted to reuse valuable materials immediately. That is, in the configuration shown in FIG. 3, it was confirmed that the valuable material can be reused in a short time by using at least the hydrophilic biodegradable material as the binder material to cover the surface of the valuable material. Further, in the configuration shown in FIG. 3, the components of the molding material are divided into two in the thickness direction so that the biodegradability inside the mold is high. However, the composition ratio of the biodegradable material is set to three or more. It is also possible to use modified molding.

<Third Embodiment> Next, a molded motor and a method for disassembling the same according to the present invention will be described with reference to FIG. In FIG. 5, after the stator core 7 and the stator winding 6 are molded with the molding material 8, the top coat layer 12 is further excellent in water resistance and antibacterial property.
Covers the entire surface of the stator 1. Therefore, the stator 1
The storability as the above can be improved by the top coat layer 12. However, at the time of decomposition, the top coat layer 12 is partially peeled off so that microorganisms can contact the molding material 8, or scratches or holes penetrating in the thickness direction of the layer are formed, and then biodegradability of horticultural soil etc. Leave in the environment.

As a material for forming the top coat layer 12, a resin material having good nondegradability (bacterial resistance) and water resistance,
For example, the above-mentioned non-decomposable resin can be used. In addition, even with aqueous materials such as polyvinyl alcohol, carboxymethyl cellulose, and polyethylene oxide, the above-mentioned preservatives, bactericides, insecticides, sociicides, etc. are mixed, and then glyoxal or melamine resin is mixed to heat-crosslink them on a daily basis. It is possible to achieve water resistance and non-decomposability that can be used, and it can be used as a material for forming the top coat layer 12. The top coat layer 12 is formed, for example, by applying and drying a solution in which the above-mentioned non-decomposable resin is dissolved or a suspension liquid in which the non-decomposable resin is dispersed, or by applying the stator 1 molded with the molding material 8 to the top coat layer 12
It can be obtained by heat-sealing with a mold of the final molded body in a state of being wrapped in a sheet of the structural material forming the.

A detailed experimental example in the third embodiment will be described below. The composition of the molding material 8 is not limited to these. In this experiment, first, a silicon steel plate of the stator core 7 wound with a copper wire (stator winding 6) having an enamel coating is molded with various molding materials 8, and then a top coat layer 12 is formed and fixed. A child 1 is prototyped, and the stator 1 is left in soil for horticultural use for 6 months to confirm biodegradability. Further, the silicon steel plate and the copper wire, which are molded valuables, can be taken out manually. I confirmed. Molding is the same as the conventional method, first install a silicon steel plate with copper wire wound in the mold,
The molding material 8 was injected into the mold while being heated to 150 to 180 ° C., and cooled. The top coat layer 12 was formed by spray-coating a mixed solution of toluene or ethanol in which polyvinyl acetal (trade name: S-REC, manufactured by Sekisui Chemical Co., Ltd.) was dissolved and then dried.
The dry thickness of the top coat layer 12 was about 0.5 mm.

The trial production of the stator 1 was performed by further forming a top coat layer 1 on the surface of the stator 1 produced in the above-mentioned Experimental Examples 1 and 3. The stator constructed in this way had good moisture resistance, and the environmental characteristics of the molded motor could be greatly improved over the prototypes produced in Experimental Examples 1 and 3. Regarding the decomposition, after the top coat layer 12 was scratched with a knife, it was left in the soil for gardening to be biodegraded, and the same decomposability as in Experimental Example 1 and Experimental Example 3 could be obtained. In addition, in order to confirm the experiment, in the present embodiment, the experiment is performed with the mold thickness made thin, but in the case of designing as a mold motor in consideration of mechanical strength, it may be about 10 mm in some cases. In this case, the decomposition procedure as described above is performed by prolonging the standing time during biodegradation.

In each of the embodiments, the molding of the stator 1 used in a brushless DC motor or an AC motor has been described, but the rotor 3 is molded in a wound type rotor used in a DC motor or the like. Also, for molded motors having completely different structures such as linear motors and the like, by using the molding material 8 described in each of the above-described embodiments, it is possible to create a molded motor that takes disassembly into consideration.

[0035]

As described above, according to the present invention, the core and the winding are integrally molded using the molding material containing at least the biodegradable material as the binder material, and after the use as the motor is completed. Is configured to be left in an environment where microorganisms that decompose the biodegradable material are present until at least a part of the molding material is decomposed, and then the remaining molding material is removed to take out the iron core or the winding. So
Easily collect molded valuables such as iron cores and windings
Can be reused.

[Brief description of drawings]

FIG. 1 is a perspective view showing the outer appearance of a first embodiment of a molded motor of the present invention.

FIG. 2 is a partial cross-sectional view showing the configuration of the molded motor of the first embodiment.

FIG. 3 is a partial cross-sectional view showing the configuration of a second embodiment of the molded motor of the present invention.

FIG. 4 is a flowchart showing a disassembling procedure of the stator 1 of the molded motor in the second embodiment.

FIG. 5 is a partial cross-sectional view showing the configuration of a third embodiment of the molded motor of the present invention.

FIG. 6 is a perspective view showing the appearance of a conventional molded motor stator.

FIG. 7 is a perspective view showing an external appearance of a stator temporary assembly before molding of a conventional mold motor.

[Explanation of symbols]

 1: Stator 2: Bracket 3: Rotor 4: Flange part 5: Mounting hole 6: Stator winding 7: Stator core 8: Mold material 9: Rotor shaft 10: Bearing

Claims (8)

[Claims] 1. A molded motor, wherein an iron core and a winding are integrally molded by using a molding material containing at least a biodegradable material as a binder material. 2. A portion directly contacting the iron core and the winding and a portion near the surface of the molded motor are molded by different first and second molding materials, respectively, and the second molding material near the surface of the molded motor is formed. The composition ratio of the biodegradable material contained as the binder material is smaller than the composition ratio of the biodegradable material contained in the first molding material in the portion which directly contacts the iron core and the winding. 1. The molded motor according to 1. 3. The molded motor according to claim 2, wherein at least a peripheral portion of the winding is molded with a molding material using only a biodegradable material as a binder material. 4. The molded motor according to claim 1, wherein a non-biodegradable material is included as a binder material of the molding material, and the non-biodegradable material is molded into a porous shape. 5. The molded motor according to claim 4, wherein the non-biodegradable material is a thermosetting resin. 6. The mold motor according to claim 1, wherein the mold material contains a hydrophilic biodegradable material having a hydroxyl group, a melamine resin, and / or glyoxal. 7. A mold motor molded by using a molding material containing at least a biodegradable material, and at least a part of the molding material is decomposed in an environment where microorganisms that decompose the biodegradable material are present. A method of disassembling a molded motor, characterized in that the remaining molding material is removed and the iron core and / or the winding is taken out. 8. Before leaving the molded motor in an environment in which microorganisms are present, at least a part of the molding material in direct contact with the iron core and the winding is processed so that the microorganisms can directly contact with it. The method for disassembling a molded motor according to claim 7, wherein.