KR102173313B1 - Motor using coil imbedded with silver nano particles And Motor regeneration method - Google Patents

Abstract

The present invention relates to a motor using a coil embedded with silver nanoparticles and a motor regeneration method. More specifically, by regenerating the motor using the coil embedded with the silver nanoparticles on pores of a surface, and, using the same, degraded coils and cores of a waste motor of which efficiency is reduced due to long period use, an amount of coil winding of a stator is not increased to reduce winding work time and manufacturing process unit costs, resistance loss compared to an existing regenerative motor is low, and lifetime of the motor is further extended, thereby improving reliability of the regenerative motor.

Description

Motor using coil imbedded with silver nano particles And Motor regeneration method}

The present invention relates to an electric motor and a motor regeneration method using a coil embedded with silver nanoparticles, and more particularly, a motor using a coil with silver nanoparticles embedded in the surface pores, and using the same, the efficiency is reduced according to long-term use. It relates to a motor regeneration method for regenerating and reusing degraded coils and cores of a waste motor.

In general, an electric motor is a kind of energy conversion device that uses electrical energy as an input source and kinetic energy such as rotational motion as an output, and is mainly used as a power source in industrial sites or around life requiring repetitive work such as rotational motion or reciprocating motion. These motors are classified into DC motors and AC motors according to the type of power source, and AC motors are classified into three-phase AC and single-phase AC, respectively, induction motors and synchronous motors.

The electric motor is composed of a stator having an excitation coil that generates magnetism by power supply, and a rotor that is rotated by an electromagnetic force formed around the stator and a shaft is fixed at the center, and the stator is applied with power to form a rotating magnetic field. It is composed of a coil and a stator core of a magnetic body that forms a path for magnetic flux generated by the rotating magnetic field.

At this time, the stator core is constituted by stacking a plurality of circular electrical steel plates in which a plurality of stator slots are radially formed at the inner periphery so that the stator slots are continuous along the axial direction, and the coil is formed in various ways through the stator slots. Is wound.

The rotor is composed of a rotor conductor that generates torque by an interaction between a current induced by a coil and a magnetic flux, and a rotor core of a magnetic body that forms a path for the magnetic flux.

At this time, the rotor core is constituted by stacking a plurality of circular electrical steel plates in which a plurality of rotor slots are radially formed at a predetermined interval on the outer circumference side so that the rotor slots are continuous along the axial direction, and the A metal such as highly conductive aluminum or copper is inserted into the rotor slot to form a rotor conductor.

The motor is affected by moisture, vibration, corrosive environment and other factors, and the cooling effect and insulation thickness performance decrease as the lifespan decreases due to long-term operation. At this time, mechanical and thermal damage to the stator core of the motor and the winding on the core The load loss of the resulting coil becomes the main factor causing the maximum loss in the case of maximum load in the induction motor.

In other words, in the case of such a deteriorated motor, it is generally imported and regenerated through replacement of damaged cores and rewinding of the coil. However, the conventional method of regenerating the motor according to core replacement and rewinding of the coil is air between the cores. Due to factors such as gaps, thermal damage to the surrounding housing, and copper loss in the stator, efficiency reduction of about 4 to 5% compared to new products is inevitable.In the field, the current reset of the equipment due to the reduced loss of the regenerative motor and Considering the remaining life, the trend is to prefer the replacement of the waste motor to a new product rather than regeneration, and accordingly, there is a problem that unnecessary resources and capital are consumed for the disposal of the replaced waste motor and the production of new products.

Korean Patent Publication No. 10-0340321 (Registered on May 29, 2002)

The present invention was conceived to solve the above problems, and by regenerating a waste motor with reduced efficiency, by mitigating the difference in efficiency between a new product and a regenerative motor that inevitably occurs, power consumption compared to the existing regenerative motor can be reduced. It is intended to provide a motor and a motor regeneration method using a coil in which silver nanoparticles are embedded.

In order to solve the above problems, the electric motor using a coil embedded with silver nanoparticles of the present invention is an electric motor that generates a rotational force by a magnetic field induced by a current applied to either a stator or a rotor, and the electric motor A coil is wound on at least one selected from the stator or the rotor, and the coil is formed by forming a void recessed inward from the surface of the copper substrate, and silver nanoparticles are buried inside the void. It features.

In addition, the outer end portion of the silver nanoparticles filled in the pores is characterized in that it forms a height below the surface of the copper substrate in the depth direction of the pores.

In addition, the coil, based on 100 parts by weight of the copper substrate, characterized in that it is configured to include 0.4 to 1 part by weight of the silver nanoparticles.

In addition, the pore size is characterized in that the 1nm ~ 3㎛.

In addition, the size of the silver nanoparticles is characterized in that 1 ~ 800nm.

In addition, in the electric motor regeneration method for regenerating the collected waste electric motor by using the coil embedded with silver nanoparticles of the present invention, the collected waste electric motor is disassembled and wound around at least one or more selected from a stator or a rotor. An electric motor decomposition step of removing the old waste coil; A non-reverse design step for re-winding into a coil in which silver nanoparticles are buried inside the voids recessed inward from the surface of the copper substrate in at least one selected from the stator and the rotor from which the waste coil has been removed; And rewinding at least one selected from a stator or a rotor from which the waste coil has been removed with a coil in which silver nanoparticles are embedded in the voids depressed inward from the surface of the copper substrate designed by the non-reverse design step. And a motor assembling step of reassembling the disassembled waste motor.

In addition, the non-reverse design step includes selecting the number of windings and the winding type of the coil in which silver nanoparticles are buried inside the voids recessed inward from the surface of the copper substrate, based on the manufacturing specifications of the waste motor. It is characterized.

At this time, in the non-reverse design step, when the electrical conductivity of the waste coil of the waste motor is lower than the electrical conductivity of the coil in which silver nanoparticles are buried inside the voids recessed inward from the surface of the copper substrate, It characterized in that the number of windings of the coil is reduced.

In addition, the electric motor regeneration method of the present invention further includes a coil manufacturing step of manufacturing a coil in which silver nanoparticles are buried in the voids recessed inward from the surface of the copper substrate,

The coil manufacturing step may include a void forming step of forming a plurality of voids on the surface of the copper substrate; A coating step of applying a paste containing silver nanoparticles on the copper substrate in which the pores are formed; And a heating step of heating the copper substrate to which the paste containing the silver nanoparticles is applied.

In addition, the pore forming step is characterized in that the surface of the copper substrate is etched by any one method selected from acid treatment, base treatment, plasma treatment, and physical treatment.

In addition, after the coating step, it characterized in that it further comprises an etching step of removing the film of the silver nanoparticles formed on the surface of the copper substrate of the coil.

At this time, the heating step is characterized in that heating the copper substrate at a temperature of 25 ~ 100 ℃.

The electric motor using a coil embedded with silver nanoparticles according to the present invention according to the above configuration does not increase the coil winding amount of the stator, thereby reducing the winding working time and manufacturing process cost, and reducing power consumption to improve energy efficiency. There is.

In addition, there is an effect of improving the reliability of the regenerative motor by lowering the resistance loss compared to the existing regenerative motor and further extending the life of the motor.

1 is a block diagram showing a partial cut-away of an electric motor using a coil in which silver nanoparticles are embedded according to the present invention.
2 is a perspective view showing a coil in which silver nanoparticles are embedded according to the present invention.
Figure 3 is a cross-sectional view showing the coil according to Figure 2;
Figure 4 is a process diagram showing a method of manufacturing a coil in which silver nanoparticles are embedded according to the present invention.
5 is a view showing a step of etching the surface of a coil in which silver nanoparticles are embedded according to the present invention.
6 is a graph showing the surface resistance of a coil in which silver nanoparticles are embedded according to the present invention.
7 is a process chart showing a motor regeneration method for regenerating the collected waste motor according to the present invention.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to a specific embodiment, it is to be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being “connected” or “connected” to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, the technical idea of the present invention will be described in more detail using the accompanying drawings.

The accompanying drawings are only an example shown to describe the technical idea of the present invention in more detail, so the technical idea of the present invention is not limited to the form of the accompanying drawings.

Prior to describing the present invention, in the present invention, the induction motor shown in FIG. 1 will be described as an example. However, the present invention is not limited thereto, and the scope of its application to various types of electric motors such as DC and AC motors, STEPPER motors, and BLDC motors, as well as diversification, deviates from the gist of the present invention as claimed in the claims. Without it, various modifications will be possible.

As shown in FIG. 1, the electric motor using a coil in which silver nanoparticles are embedded according to the present invention includes a frame 100, a stator 110, and a rotor 120.

The frame 100 forms the body of an electric motor and is configured to accommodate the stator 110 and the rotor 120.

A terminal box 130 provided with various terminals is provided outside the frame 100. In addition, an air inlet (not shown) may be formed in the frame 100 to allow external air to flow into the frame 100.

In addition, one side of the frame 100 may be provided with a cooling fan 140 for introducing external air into the frame 100 by generating air flow by rotation, and to discharge air to the outside. The inducing fan cover 150 may be coupled.

In addition, bearing brackets 160 may be coupled to both sides of the frame 100, respectively. The stator 110 includes a coil 112 that receives AC power and forms a rotating magnetic field, and a stator core 113 that forms a path for magnetic flux generated by the rotating magnetic field.

The stator 110 has a plurality of slots 111 formed along the inner circumferential surface of the stator core 113, and a coil 112 is wound in the slot 111.

Since the coil 112 wound around the stator core 113 is wound in a circumferential direction along the slot 111, a magnetic field is formed in a direction parallel to the shaft when AC power is applied.

The rotor 120 is installed to form a concentric circle with the stator 110, and the shaft 121 is rotatably coupled to the center of the stator 110 to rotate by the magnetic field of the stator 110. The rotor 120 includes a rotor conductor 122 that generates torque by an interaction between a current induced by the coil 112 and a magnetic flux, and a rotor core 123 of a magnetic material that forms a path for the magnetic flux. Include.

The shaft 121 is configured to transmit the rotational force of the electric motor to the outside, and is rotatably supported by bearings 170 provided on both sides of the frame 100. In particular, the shaft 121 extends so that one end is exposed to the outside of the frame 100 to transmit rotational force to an external device.

The rotor conductor 122 is made of aluminum die casting and is formed on the rotor core 123. The rotor conductor 122 configured as described above may generate an electromotive force required for rotation of the shaft 121 through an electrical action with the coil 112.

The rotor core 123 is coupled to the shaft 121 and is disposed to surround the shaft 121 to rotate together with the shaft 121.

Through this configuration, as AC power is applied to the coil 112, a rotating magnetic field is generated, and a magnetic flux is rotated through the stator core 113, and the rotating magnetic flux is linked to the rotor conductor 122 (the magnetic line of force is And crossing) to induce a current in the rotor conductor 122. At this time, the current induced in the rotor conductor 122 generates torque along with magnetic flux according to Fleming's left hand rule.

Here, the coil 112 may be wound on any one or more selected from the stator 110 or the rotor 120, and at this time, the electric motor 1000 may be wound according to the form in which the coil 112 is wound. It can be configured with various types of electric motors.

Hereinafter, as shown in FIG. 1, an induction motor in which an induced current is generated in the rotor 120 of the electric conductor by a rotating magnetic field made by the stator 110 to generate a rotational torque corresponding to slippage is an example. Let me explain in detail.

However, the electric motor 1000 of the present invention is not limited to the position and winding method of the coil 112 to be described later, and may be modified in various forms without departing from the gist of the present invention.

2 and 3, the coil 112 is manufactured in the form of a wire made of a copper substrate 112b, and is wound on a slot formed in the stator 110, and the coil 112 is copper Silver nanoparticles 112c are embedded in the interior of the plurality of voids 112a that are depressed inward from the surface of the substrate 112b.

In this case, the coil 112 is preferably formed in a shape such as a circle or a square, but the shape of the coil 112 is not limited thereto and may be formed in various shapes.

The copper substrate 112b is a raw material constituting the coil 112, and is preferably made of copper or a copper alloy, and the silver nanoparticles 112c are formed in a wire form using a copper substrate 112b. In order to improve the electrical conductivity of the manufactured coil, it is a material for integrally forming by embedding on the surface of the copper base 112b through a special treatment, and has a higher electrical conductivity than the copper base 112b and has a lower melting point. Is being achieved.

Therefore, a coil formed by forming voids in the copper substrate 112b and embedding silver nanoparticles 112c in the voids formed in the copper substrate 112b has electrical conductivity, durability, and more than a coil made of only the copper substrate 112b. Acid resistance can be improved.

At this time, the coil 112 is preferably formed to include 0.4 to 1 parts by weight of silver nanoparticles based on 100 parts by weight of copper or copper alloy, and when the silver nanoparticles 112c are less than 0.4 parts by weight, the coil 112 ) May be limited in improving the electrical conductivity and preventing oxidation, and if it exceeds 1 part by weight, the content of silver increases, thereby increasing the cost of the manufacturing process.

In addition, the size of the pore (112a) is 1nm ~ 3㎛, when the size of the pore (112a) is less than 1nm, the size of the pore (112a) is too small, there is no significant difference from the surface roughness of a general coil In the case of exceeding 3 μm, the size of the pores 112a is too large, and the silver nanoparticles 112b are not sufficiently buried and separated.

At this time, the size of the silver nanoparticles 112b is 1 to 800 nm, and when the size of the silver nanoparticles 112c is less than 1 nm, an additional process is required to manufacture too small particles, and thus the cost of the manufacturing process There is a problem of rising, and when it exceeds 800 nm, it is not easy to fill in the voids 112a.

As shown in FIG. 4, the coil 112 includes a void forming step (S410) of forming a plurality of voids on the surface of a copper substrate, and a coating step of applying a paste containing silver nanoparticles on the copper substrate ( S420), the etching step (S430) of removing the silver nanoparticle film formed on the surface of the copper substrate, and the heating step (S440) of heating the copper substrate including the silver nanoparticles.

To describe this in more detail, first, a plurality of voids 112a are formed on the surface of the copper substrate 112b, which is the basic material of the coil 112 (S410). In this case, the step of forming a plurality of voids on the surface of the copper substrate 112b is a step of etching the surface of the copper substrate 112b by one method selected from acid treatment, base treatment, plasma treatment, and physical treatment. In the case of acid treatment, one or more selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, and combinations thereof may be used.

In addition, in the case of base treatment, the base may include an alkali metal and amines. Here, the alkali metal may be one or more selected from the group consisting of Li, Na, K, and combinations thereof.

In addition, the base may be one or more selected from the group consisting of NaOH, KOH, LiOH, and combinations thereof.

The amines are selected from the group consisting of ethylenediamine, propylenediamine, methylenediamine, ethylamine, 1,2-dimethoxyethane, hexamethyleneimine, diisopropylamide, diethanolamine, oleethyleneamine, and combinations thereof. Liquid ammonium-based material, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, diaminohydroxypropanetetraacetic acid, and those selected from the group consisting of combinations thereof, or terahydrofuran, dimethylsulfoxide, Hexamethylphosphoramide, diethylamine, triethylamine, diethylenetriamine, toluene diamine, m-phenylenediamine, diphenylmethanediamine, hexamethylenediamine, triethylenetetraamine, tetraethylenepentaamine, hexamethylenetetra One or more selected from the group consisting of amine, ethanolamine, diethanolamine, triethanolamine, and combinations thereof may be used.

In addition, in the case of plasma treatment, it is preferable to perform the surface etching of the coil 112 by plasma at a temperature of 500 to 1000°C.

In this case, when the temperature of the plasma is less than 500°C, the voids 112a are not sufficiently generated on the surface of the coil 112, and when it exceeds 1000°C, thermal damage may occur in the plasma device.

That is, the plasma is preferably performed under a power of 500 ~ 900W, and when the power of the plasma is less than 500W, the void 112a may not be sufficiently generated on the surface of the coil 112, and when it exceeds 900W Plasma ions in the coil 112 may splash in all directions due to plasma, thereby contaminating the interior of the chamber.

In addition, the plasma treatment is preferably performed under a pressure of 10-1 to 700 Torr. In addition, in the case of physical treatment, after the coil 112 and diamond powder having a size of 3 to 5 μm are immersed in a solvent, ultrasonic treatment may be performed for 15 minutes to 1 hour.

Subsequently, a paste including silver nanoparticles 112c is applied to the surface of the copper substrate 112b (S420).

In this case, as the paste including the silver nanoparticles 112b, one or more selected from the group consisting of toluene, ethyl lactate, acrylic resin, and combinations thereof may be used.

The method of applying a paste containing silver nanoparticles 112b to the copper substrate 112b is a spin coating method, a cast method, a Langmuir-Blodgett (LB) method, an inkjet printing method, a nozzle printing method. , Slot die coating method, doctor blade coating method, screen printing method, dip coating method, gravure printing method, reverse offsen printing method, spray coating method, and one or more selected from the group consisting of combinations thereof can be used. have.

At this time, by adjusting the concentration and amount of the paste containing the silver nanoparticles 112b, the amount of the silver nanoparticles 112b applied to the copper substrate 112b can be adjusted. In order to adjust the size, one selected from the group consisting of beads mill, ball mill, attention mill, and combinations thereof may be used.

Meanwhile, as shown in FIG. 5, in the manufacturing step of the coil 112, an etching step of removing the silver nanoparticle film formed on the surface of the copper substrate 112b to which the paste containing the silver nanoparticles 112c is applied ( S430) may be further included.

The paste containing the silver nanoparticles 112c is not only filled in the voids 112a of the copper substrate 112b, but may also be formed in the form of a film on the surface of the copper substrate 112b. By etching the silver nanoparticle film formed in the form of a film on the surface, the silver nanoparticles 112b formed in the form of a film on the surface of the copper substrate 112b are removed, so that the silver nanoparticles 112b are located only in the pore 112a. can do.

In this case, the etching may be performed by a physical method (for example, a method of scraping using another object), an ultrasonic treatment method, or the like.

Subsequently, the copper substrate 112b to which the paste including the silver nanoparticles 112b is applied is heated (S440). The heating of the copper substrate 112b is preferably performed at a temperature of 25 to 100°C.

In general, high temperatures are required to process metal. On the other hand, the copper substrate 112b in which the silver nanoparticles of the present invention are buried may be heat-treated at a low temperature of less than 100°C to achieve an effect of improving the electrical conductivity and acid resistance of the copper substrate 112b. Moreover, it consumes a lot of energy and cost to create high temperature conditions.

However, the copper substrate 112b in which the silver nanoparticles of the present invention are embedded is heat-treated at a low temperature of less than 100° C. to reduce the cost of the manufacturing process and facilitate commercialization.

More specifically, in the case of the copper substrate 112b in which the silver nanoparticles are embedded, the melting point of copper is 1,085°C, and the melting point of silver is 961.8°C, but at this time, the silver nanoparticles 112c are used as silver nanoparticles having a small particle size. In this case, when the size of the particles is reduced in nanometers, the surface area increases compared to the volume of the particles, so that the melting temperature is significantly lowered. Accordingly, the heating step of the copper substrate 112b can be performed at a low temperature.

Meanwhile, the heating time may be adjusted according to the heating temperature of the copper substrate 112b. For example, it is preferable to heat for 1 hour at a low temperature of 25°C and 5 minutes at a high temperature of 100°C.

In the heating process, a material such as a solvent other than silver included in the paste containing silver nanoparticles may be removed. In this way, the copper substrate 112b in which the silver nanoparticles are embedded is improved in electrical conductivity and acid resistance.

Accordingly, the coil 112 made of a copper substrate in which silver nanoparticles are embedded may increase the current that can be applied, thereby increasing the magnitude of the induced magnetic field. In addition, since the acid resistance is improved, the durability of the coil 112 made of a copper substrate in which silver nanoparticles are embedded is increased.

Hereinafter, the present invention will be described in more detail by examples. However, the following examples are only illustrative of the present invention, and the contents of the present invention are not limited to the following examples.

[Example 1]

First, a 15 mm long coil was introduced into a beaker, and then distilled water and a 3 μm sized diamond powder were additionally added to the beaker.

The beaker was subjected to ultrasonic treatment for 30 minutes to form voids on the surface of the copper substrate of the coil. After the coil with voids was removed from the beaker, a paste containing silver nanoparticles was applied to the coil with voids.

The silver nanoparticle film was removed using a sandpaper on the surface of the coil on which the paste containing the silver nanoparticles was applied, so that the silver nanoparticles could be formed only in the pores.

The coil to which the paste containing the silver nanoparticles was applied was heated at a temperature of 90° C. for 30 minutes to prepare a coil in which 0.41% of the silver nanoparticles were embedded.

[Example 2]

A coil in which silver nanoparticles are embedded was prepared in the same manner as in Example 1, except that the amount of silver nanoparticles was 0.49%.

[Example 3]

A coil in which silver nanoparticles are embedded was prepared in the same manner as in Example 1, except that the amount of silver nanoparticles was 0.60%.

[Example 4]

A coil in which silver nanoparticles are embedded was prepared in the same manner as in Example 1, except that the amount of silver nanoparticles was 0.67%.

[Example 5]

A coil in which silver nanoparticles are embedded was prepared in the same manner as in Example 1, except that the amount of silver nanoparticles was 0.72%.

[Example 6]

A coil in which silver nanoparticles are embedded was prepared in the same manner as in Example 1, except that the amount of silver nanoparticles was 0.78%.

[Comparative Example 1]

A coil in which silver nanoparticles are embedded was prepared in the same manner as in Example 1, except that the amount of silver nanoparticles was 0.27%.

[Comparative Example 2]

First, a paste containing silver nanoparticles was applied to a 15 mm long coil.

The coil to which the paste containing the silver nanoparticles was applied was heated at a temperature of 90° C. for 30 minutes to prepare a coil coated with 1.21% of the silver nanoparticles.

[Experimental Example 1] Surface resistance according to the content of silver

The electrical properties of the coils in which the silver nanoparticles prepared in Examples 1 to 6 and Comparative Examples 1 and 2 were embedded were observed.

As shown in FIG. 6, it can be seen that the surface resistance of the coil in which the silver nanoparticles prepared in Examples 1 to 6 are embedded is lower than the initial surface resistance of the coil of 8Ω/□.

On the other hand, in the case of Comparative Example 1 in which the amount of silver nanoparticles is 0.27%, it can be seen that the surface resistance is 9.3Ω/□, which is higher than the surface resistance of the initial coil.

This means that an oxidation reaction occurs on the surface of the coil during the heating process, and the amount of the silver nanoparticles is not sufficient to prevent the oxidation reaction.

In the case of Comparative Example 2 in which the content of silver nanoparticles was 1.21%, the surface resistance was the lowest 1.31Ω/□. However, as the content of silver nanoparticles increases, the cost of the manufacturing process increases, resulting in poor economic efficiency.

[Experimental Example 2] Surface resistance according to heating temperature

The surface resistance according to the heating temperature of the coil in which the silver nanoparticles of Example 6 were embedded was measured.

Table 1 below shows the surface resistance of a coil in which silver nanoparticles are embedded and a coil in which silver nanoparticles are not embedded according to the heating temperature.

Temperature(℃) 85 90 95 100 110 120 130 140 Coating side (Ω/□) 2.3 2.1 1.4 1.8 2.3 2 2.8 1.4 Opposite side (Ω/□) 6.3 7.1 8.4 7.5 13.5 16.2 18.6 22.4

As shown in Table 1, it can be seen that the surface resistance of the coil in which the silver nanoparticles are embedded decreases up to a temperature of 100°C. On the other hand, it can be seen that the resistance of the coil in which the silver nanoparticles are embedded increases at a temperature of 110°C to 130°C.

At a temperature of 140°C, the surface resistance of the coil impregnated with silver nanoparticles decreased to 1.4Ω/□, but the surface resistance of the coil without silver nanoparticles increased to 22.4Ω/□.

At a temperature of 140°C, it can be seen that the oxidation reaction of the coil in which the silver nanoparticles are not embedded is promoted, resulting in increased surface resistance.

That is, the present invention has the effect of improving the electrical conductivity of the coil by heating the coil at a temperature of less than 100°C.

[Experimental Example 3] Confirmation of silver separation

The content of the silver nanoparticles according to the ultrasonic treatment time of the coil in which the silver nanoparticles of Example 6 were embedded and the coil coated with the silver nanoparticles of Comparative Example 2 was confirmed.

Table 2 below shows the content of silver nanoparticles according to the ultrasonic treatment time.

20 minutes 40 minutes 60 minutes 80 minutes 100 minutes Example 6 0.77% 0.75% 0.70% 0.69% 0.67% Comparative Example 2 1.01% 0.92% 0.78% 0.63% 0.60%

As shown in Table 2, the content of the silver nanoparticles of Example 6 and Comparative Example 2 decreases as the ultrasonic treatment proceeds.

However, after performing the ultrasonic treatment for 100 minutes, Example 6 was found to be 0.67%, which was reduced by 12.98% in the content of silver nanoparticles, whereas Comparative Example 2 was found to be 0.60%, which was reduced by 40.59% in the content of silver nanoparticles. .

Moreover, it can be seen that the content of the silver nanoparticles of Example 6 is greater than the content of the silver nanoparticles of Comparative Example 2 after 100 minutes of ultrasonic treatment.

That is, it can be seen that the bonding strength between the silver nanoparticles and the coil is improved as the silver nanoparticles are embedded in the pores formed on the surface of the coil.

The present invention has been described with reference to the accompanying drawings, but it is apparent to those skilled in the art that many various obvious modifications are possible without departing from the scope of the present invention from this description.

Accordingly, the scope of the present invention should be interpreted by the claims set forth to include examples of such many modifications.

<How to recycle waste motor>

Hereinafter, a method of regenerating an electric motor for regenerating the collected waste electric motor using a coil embedded with silver nanoparticles of the present invention will be described in detail with reference to FIG. 7.

The motor regeneration method includes the motor recovery step (S100), the motor disassembly step (S110), the winding data collection step (S200), the non-reverse design step (S300), the coil manufacturing step (S400), the motor assembly step (S500) and verification. It may be made including a test step (S600).

First, the electric motor is disassembled in the equipment where the electric motor subject to repair, inspection, or maintenance is installed, and transported the disassembled electric motor to the factory for regeneration and maintenance (S100), and the waste electric motor collected and stored in the factory is disassembled (S110). ), and then, in the winding data collection step (S200), the waste motor undergoes visual inspection, electrical inspection, and mechanical inspection steps to diagnose problems and repair ranges of the motor, and to prepare a stock inspection report for the worn waste motor. do. In more detail, during the above visual inspection, the appearance and structure of the waste motor, the dimensions and painting conditions of each disassembled component are observed and measured with the naked eye and a measuring instrument. In the above electrical inspection, the measurement of the winding resistance is performed at an arbitrary ambient temperature. After measuring by law, checking the disconnection and resistance unbalance rate of the winding, restraining the rotor and adjusting the input current to approximate 100% of the rated current, respectively, and measuring the input and voltage at that time, and the rated voltage and rated frequency It can be carried out including a no-load test that measures the input and current when operated at no load.

In addition, during the mechanical inspection, the noise, vibration, insulation resistance and withstand voltage of the motor are measured, and the starting current, starting torque, efficiency, power factor, rated current, rated torque, maximum torque, rotational speed, etc. are measured and device tests are performed.

At this time, it is configured to include an efficiency improvement determination step (S210) of determining whether the efficiency improvement of the waste motor is necessary.

Here, the efficiency improvement determination step (S210) is based on the warehousing inspection form (ITP) created during the overhaul of the motor, and the customer approval document or inspection standard is judged as the first priority (At this time, the electrical characteristic is the tolerance specified by the IEC. It is desirable to apply it.) Afterwards, the second priority is determined based on the KS standard (however, if the KS standard is not specified, follow the IEC or NEMA standard), and the third priority is the allowable value according to the general practice. It is desirable to apply and judge.

In addition, if it is determined that it is not necessary to improve the efficiency of the inspected motor, after washing and servicing some of the old parts, it can be assembled and re-used by performing a verification test step (S600) to be released. (S210-S211-S500-S600)

However, if it is determined that it is necessary to improve the efficiency of the inspected waste motor, it is preferable to regenerate the motor through the non-reverse design step (S300) for improving the efficiency of the motor.

The non-reverse design step (S300) is to improve the efficiency of the motor and regenerate the motor by comparing it with manufacturing specifications based on the winding data of the waste coil collected in the winding data collection step (S200), and the motor decomposition step ( By replacing the waste coil removed in S210) with the coil 112 in which the silver nanoparticles described above are embedded, the efficiency of the waste motor may be increased, the life span may be extended, and thus reuse may be performed.

In more detail, the non-reverse design step (S300) includes a characteristic inspection step (S310) of inspecting the characteristics of each part of the electric motor to be redesigned, and then the material, numerical value, number and size of slots of the target part, A redesign step (S320) for improving the efficiency of the motor is performed in consideration of the number of windings of the coil, coil diameter, and ventilation performance.

In this case, in the redesign step (S320), a core and a coil having at least one selected from among efficiency, power factor, current, and current reduction rate may be selected by comparing the measured characteristics of the waste motor and the manufacturing specifications of the waste motor. In the electric motor regeneration method of the present invention, based on the manufacturing specifications of the waste electric motor, in order to regenerate the characteristics of the waste electric motor, the inside of the void 112a recessed inward from the surface of the copper substrate 112b described above. It is preferable to select the number of windings and the winding type of the coil 112 in which the silver nanoparticles 112c are embedded.

In more detail, when the electrical conductivity of the waste coil of the waste motor is lower than the electrical conductivity of the coil 112 in which silver nanoparticles are buried in the voids recessed inward from the surface of the copper substrate, the coil to be re-wound ( By reducing the number of windings of 112), there is an advantage of reducing the cost of rewinding the coil, and in addition, the efficiency of the motor regenerated when the rewinding coil 112 is wound at the same number of windings as the waste coil of a waste motor. Can improve.

At this time, the redesign step (S320) may further include an insulation design step of designing the winding shape and coupling structure of the core and coil in consideration of the winding resistance, ambient temperature, and life expectancy of the selected core and coil. The coil re-winding step (S330) of winding the coil 112 in the number of windings and the winding form of the coil 112 designed in the redesign step (S320), and for covering the wound coil and core with insulating paint. It is preferable to perform the vacuum impregnation (S340) and the insulation diagnosis step 350 of diagnosing the insulation properties of the coil and the core.

In addition, the coil manufacturing step (S400) may be selected to improve the efficiency of the motor regenerated in the non-reverse design step (S300), and preferably, a stator, a rotor or a copper coil according to the rewinding of the coil It is preferable to be performed indispensably to mitigate the inevitable efficiency reduction due to electromagnetic changes due to losses and thermal damage to the core and the deviation of concentricity between the rotor and the fault, and at this time, the timing of performing the coil manufacturing step (S400) is described above. It is not limited to the order, and various modifications may be made without departing from the gist of the present invention.

As an example, in the redesign step (S320), it is possible to design the number and shape of the rewinding coil by comparing the characteristics of the coil in which the previously manufactured silver nanoparticles are embedded and the waste coil of the waste motor. In the rewinding step (S330), the rewinding of the coil is performed using a pre-fabricated coil to shorten the time of the motor regeneration process.

In addition, the coil manufacturing step (S400), as described above, a void forming step (S410) of forming a plurality of voids (112a) on the surface of the copper substrate (112b), the void in the void forming step (S410) ( A coating step (S420) of applying a paste including the silver nanoparticles 112c on the copper substrate 112b on which 112a) is formed, removing the film of the silver nanoparticles 112c formed on the surface of the copper substrate 112b It may be manufactured through an etching step (S430) and a heating step (S440) of heating the copper substrate to which the paste containing the silver nano-Iba is applied.

Thereafter, the motor assembly step (S500) of reassembling each component that has been redesigned is performed, and the reassembled motor is characterized by a characteristic test step (S610) comparing the characteristics before and after improvement, and the reliability and thermal of the regenerated motor. Through the load test step (S620) of determining the life, it is possible to regenerate a waste motor whose life has expired or has reduced efficiency.

As described above, the electric motor regeneration method of the present invention can improve the electric conductivity and acid resistance of the regenerated electric motor by mitigating the inevitable loss reduction compared to the regeneration method through rewinding the coil of the existing electric motor. In addition, by embedding silver nanoparticles on the surface of the coil made of copper or copper alloy described above, it is possible to omit the material mixing process for improving the physical properties of the coil, thus further simplifying the coil manufacturing process. Further, compared to the method of forming a silver film on the entire surface of copper, the content of silver can be selectively reduced, thereby further lowering the production cost.

It goes without saying that the present invention is not limited to the above-described embodiments, and the scope of application thereof is diverse, and various modifications can be implemented without departing from the gist of the present invention claimed in the claims.

1000: electric motor
100: frame 110: stator
111: slot 112: coil
112a: void 112b: copper base
112c: silver nanoparticles
113: stator core 120: rotor
121: shaft 122: rotor conductor
123: rotor core 130: terminal box
140: cooling fan 150: fan cover
160: bearing bracket 170: bearing
S100: Motor recovery step S110: Motor disassembly step
S200: Winding data collection step S210: Efficiency improvement determination step
S211: cleaning and maintenance steps
S300: non-reverse design step S310: characteristic inspection step
S320: redesign step S330: coil rewind step
S340: vacuum impregnation step S350: insulation diagnosis step
S400: coil manufacturing step S410: void formation step
S420: application step S430: etching step
S440: heating step S500: motor assembly step
S600: verification test step S610: characteristic test step
S620: Load test step

Claims (13)

In an electric motor that generates a rotational force by a magnetic field induced by a current applied to either a stator or a rotor,
In the electric motor, a coil is wound around at least one or more selected from the stator or the rotor,
The coil,
A void recessed inward from the surface of the copper substrate is formed,
An electric motor using a coil in which silver nanoparticles are embedded, characterized in that formed by embedding silver nanoparticles in the void.
The method of claim 1,
An electric motor using a coil embedded with silver nanoparticles, characterized in that the outer end of the silver nanoparticles filled in the pores has a height below the surface of the copper substrate in the depth direction of the pores.
The method of claim 2,
The coil,
An electric motor using a coil embedded with silver nanoparticles, comprising: 0.4 to 1 parts by weight of the silver nanoparticles based on 100 parts by weight of the copper substrate.
The method of claim 2,
An electric motor using a coil embedded with silver nanoparticles, characterized in that the size of the pores is 1 nm to 3 μm.
The method of claim 2,
The size of the silver nanoparticles is a motor using a coil embedded with silver nanoparticles, characterized in that 1 ~ 800nm.
In the motor regeneration method for regenerating the collected waste motor using a coil embedded with silver nanoparticles,
A motor disassembly step of disassembling the collected waste motor to remove the waste coil wound around at least one or more selected from a stator or a rotor;
A non-reverse design step for re-winding into a coil in which silver nanoparticles are buried inside the voids recessed inward from the surface of the copper substrate in at least one selected from the stator and the rotor from which the waste coil has been removed; And
Disassemble after re-winding at least one selected from the stator or rotor from which the waste coil has been removed with a coil in which silver nanoparticles are buried in the pores recessed inward from the surface of the copper substrate designed by the non-reverse design step An electric motor regeneration method comprising: an electric motor assembling step of reassembling the waste electric motor.
The method of claim 6,
The non-reverse design step,
A method for regenerating an electric motor, characterized in that, based on the manufacturing specification of the waste electric motor, the number of windings and the winding type of a coil in which silver nanoparticles are buried in a void recessed inward from the surface of the copper substrate are selected.
The method of claim 7,
In the non-reverse design step,
When the electrical conductivity of the waste coil of the waste motor is lower than the electrical conductivity of the coil in which silver nanoparticles are buried in the voids recessed inward from the surface of the copper substrate, reducing the number of windings of the coil to be re-wound Electric motor regeneration method characterized in that.
The method of claim 6,
A coil manufacturing step of manufacturing a coil in which silver nanoparticles are embedded in the voids recessed inward from the surface of the copper substrate; further comprising,
The coil manufacturing step,
A void forming step of forming a plurality of voids on the surface of the copper substrate;
A coating step of applying a paste containing silver nanoparticles on the copper substrate in which the pores are formed; And
And a heating step of heating the copper substrate to which the paste containing silver nanoparticles is applied.
The method of claim 9,
The pore forming step,
An electric motor regeneration method, characterized in that the surface of the copper substrate is etched by any one method selected from acid treatment, base treatment, plasma treatment, and physical treatment.
The method of claim 9,
After the coating step, an etching step of removing a film of silver nanoparticles formed on the surface of the copper substrate of the coil.
The method of claim 9,
The heating step,
Electric motor regeneration method, characterized in that heating the copper base material at a temperature of 25 ~ 100 ℃.
A motor regenerated by using the motor regeneration method according to any one of claims 6 to 12.

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