JP2007143386A - Motor component having insulating coated film structure of one layer or two layers and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor core suitable for manufacturing a small, precise, and thin motor which has a sufficient rust prevention characteristic and an insulation characteristics, in which winding corruption does not occur when winding is given to a slot of the motor core and which has sufficient operability by a simple manufacture process and to provide a manufacturing method of the motor core. <P>SOLUTION: A motor component has a one layer insulating coated film structure obtained by forming an electrodeposition coated film on a surface of the motor component or a two layer insulating coated film structure where a top coat by spraying is formed by using paint composite for electrodeposition, where a part of additive in paint composite containing coat formation polymer, water solvent, and additive is substituted for micro gel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an insulating structure of a motor component, for example, a motor core, and more particularly to a motor component having a one-layer or two-layer insulating coating structure and a manufacturing method thereof.

Conventionally, in order to ensure insulation of motor parts, for example, the core of a motor, an insulating coating has been applied to the core by a method such as electrostatic coating, but adjustment of the film thickness dimension and uniformity of the insulating coating is performed. Since it is difficult and comparatively thick, it is known to insulate the core by electrodeposition coating that allows easy adjustment of the coating film size of the insulating coating film and can be formed thinly (Patent Document 1, Patent) Reference 2 and Patent Reference 3). The smaller the core, the more the winding space is affected by the thickness of the insulating coating, and the thicker the coating, the smaller the winding space and the predetermined number of turns, and the same number of turns. However, the length of the winding becomes longer, which may increase the electrical resistance and lead to the problem of ensuring the specified performance. For this reason, the overall dimensions of the winding and the core must be increased to increase the size of the entire motor. There is a risk that it will lead to things that will not happen.

Furthermore, regarding the technical meaning of electrodeposition coating of the core, the problems that could not be achieved with the conventional coating technology were pointed out, the flow of technology to replace with electrodeposition coating was shown, and the core was coated with electrodeposition coating. It is described that a motor with excellent properties can be obtained (see Patent Document 4).
It is also known to provide a core having a good corrosion resistance and insulating electrodeposition coating by electrodeposition coating a core used in a motor for driving a magnetic storage medium such as a hard disk to increase the edge cover ratio ( Patent Document 5).

Here, the Sn component is 12 ppm or less of the aqueous solution, the amount of carbon black is 0.5 wt% or less of the aqueous solution, and instead, TiO ₂ and / or SiO ₂ is added to the pigment, and the pigment having a solid content of 22 to 40 wt% Using electrodeposition paint containing components, it is insulated by cationic electrodeposition so as to have a predetermined film thickness on motor parts (Nd-Fe-B plastic magnet, silicon steel stack core, Al die cast motor base) It is disclosed that a coating is electrodeposited and heated in a temperature range of 40 to 90 ° C. and then subjected to a two-stage curing process in which the coating is heated to a temperature range of 150 to 190 ° C. It is shown that there is no scattering of Sn from each part, no memory destruction occurs, and good corrosion resistance and insulation are exhibited.
Further, here, the electrodeposition coating suppresses the Sn component in the aqueous solution to 12 ppm or less, the amount of carbon black is 0.5 wt% or less with respect to the aqueous solution, and TiO ₂ and / or SiO ₂ is added to the pigment. 1 shows a magnet core formed of an electrodeposition paint containing a pigment component having a solid content of 16 to 28 wt%.
Electrodeposition paints used for the electrocoating of magnet cores are well known without mentioning the literature, and there are various types of film-forming resins, but typically epoxy-based ones are known. (Patent Document 6).
In addition, it is known to add a cationic resin microgel comprising core / shell type cationized gel particles having excellent dispersion stability as a matting agent to an electrodeposition paint, particularly a cationic electrodeposition paint (Patent Documents). 7).
Also, cation containing cationic gel fine particles composed of 10-20% acrylic resin in solid part weight ratio in solid content of amine-modified epoxy resin, fully blocked isocyanate, cationic emulsified and dispersed acrylic resin, pigment and electrodeposition paint. It is known to use an electrodeposition coating composition for imparting rust prevention and weather resistance to an automobile wheel. (Patent Document 8)
Furthermore, the present inventor has already provided an electrodeposition coating film, a first spray coating insulating coating film with a pencil hardness of 2H to 3H, and a second spray coating insulating coating film with a pencil hardness of 3H to 6H on the surface of the motor core. A motor core having a three-layer insulating coating film structure formed, wherein the motor core has a structure in which a plurality of metal plates are laminated, and the average film thickness of the electrodeposition coating film is 15 to 25 μm, An application has been filed for a motor core having a three-layer insulating coating structure in which the first spray-coating insulating coating is 20 to 35 μm thick and the second spray-coating insulating coating is 5 to 15 μm thick. (Patent Document 9).

JP 58-83559 A JP 58-83561 A Published Utility 61-205111 JP-A-01-278242 B JP-A-8-265994 (Patent No. 3644080) JP-A-6-41788 JP 05-179002 A Japanese Patent No. 2862577 JP 2005-31219 A

The inventor has a simple manufacturing process with fewer layers compared to the motor core having a three-layer insulating coating structure of Patent Document 9, and has sufficient anticorrosive and insulating properties even when thin, and has an edge Small precision motor with improved operability that can be applied to HDD motors with SiO ₂ problems, with improved cover ratio and no winding collapse or poor insulation when winding the motor core slot. Provided are a motor part suitable for manufacturing a motor and a method for manufacturing the same.

The present invention provides an electrodeposition coating composition in which a part of an additive in a coating composition containing an epoxy film-forming polymer, an aqueous solvent, and an additive is replaced with an acrylic microgel. A motor component having a single-layer insulating coating structure formed by forming an electrodeposition coating on the surface.
Further, the present invention is an electrodeposition coating material in which the coating composition for electrodeposition coating contains 1.5 to 8% by weight of thinner of the coating composition for electrodeposition coating, and the inorganic component in the additive is electrodeposition coating. It can be made into 15 mass% or less of the coating composition for coatings.
Furthermore, in the present invention, it is desirable that the amount of the acrylic microgel added is 1.0 to 3.6% by mass of the coating composition for electrodeposition coating.
Furthermore, in the present invention, the electrodeposition coating composition preferably has a Pb content of 1 ppm or less and an Sn content of 3 ppm or less.
Further, the present invention provides a motor component having a two-layer insulating coating structure characterized by further having a top coat film by spray coating on the surface of the motor component formed with these electrodeposition coating films. It can be.
In the present invention, the film forming polymer of the top coat by spray coating can be a silicate-modified acrylic resin, but a silicate-modified acrylic resin paint that does not contain an inorganic additive can be used. .
Furthermore, as a silicate-modified acrylic resin paint, in consideration of coloring and leveling properties after painting, a paint containing mainly a pigment such as TiO ₂ and containing only 1% or less of SiO ₂ particles may be used. However, for HDD applications, it is desirable not to contain any SiO2 as a pigment.

Also, the present invention is for electrodeposition coating in which a motor component is connected as a cathode, and a part of the additive in the coating composition comprising an epoxy film-forming polymer, an aqueous solvent and an additive is replaced with an acrylic microgel. Immerse it in an electrodeposition paint bath containing the paint composition, apply a DC voltage of 80 to 300 V using the electrodeposition paint bath as an anode, perform electrodeposition coating, pull up from the electrodeposition paint bath, wash with water, A method for producing a motor component having a single-layer insulating coating structure, wherein a coating film is heated and cured.
Here, in the present invention, when the electrodeposition coating film is heat-cured, it is preferably held at 110 to 140 ° C. for 10 to 30 minutes and baked at 180 to 200 ° C. for 20 to 40 minutes.
Furthermore, the present invention is for electrodeposition coating in which a motor component is connected as a cathode and a part of an additive in a coating composition comprising an epoxy film-forming polymer, an aqueous solvent and an additive is replaced with an acrylic microgel. Immerse it in an electrodeposition coating tank containing the coating composition, apply a DC voltage of 80-300V with the coating coating tank as the anode, apply the electrodeposition coating, pull it up from the electrodeposition coating tank, wash it with water, heat cure Next, a method for producing a motor part having a two-layer insulating coating structure is characterized in that a silicate-modified acrylic resin paint is applied by spray coating to provide a top coat film and the top coat film is heated and cured. .
Here, in the present invention, when the electrodeposition coating film is heat-cured, it is held at 110 to 140 ° C. for 10 to 30 minutes, baked at 180 to 200 ° C. for 20 to 40 minutes, and the top coat film is 180 to 200 ° C. It is desirable to bake for 20 to 40 minutes.
Furthermore, in the present invention, after motor parts are electrodeposited and heated and cured, the motor parts are placed on a wire mesh with a distinction between upper and lower parts, and spray coating is performed from above the motor parts. Heat to ~ 200 ° C to form a topcoat film, and then place the motor parts upside down again, spray again from above the motor parts, and then heat to 180-200 ° C to topcoat film It is a manufacturing method of the components for motors which have the two-layer insulation coating film structure which formed.

The motor component having a one- or two-layer insulating coating structure of the present invention is thin and durable with a good edge coverage without using a large amount of inorganic additives such as TiO ₂ and / or SiO _2. This is a motor part having a sufficient insulating property and a good corrosion resistance and insulating electrodeposition film. In addition, the motor core having a one- or two-layer insulation coating structure of the present invention is suitable for manufacturing a small precision motor because winding does not occur when winding is applied to the slot of the motor core. Good products can be reduced. Furthermore, since the silicate-modified acrylic resin coating contains only 1% or less of SiO ₂ particles, it is possible to prevent a bearing damage accident due to scattering of SiO ₂ fine particles.
The method for manufacturing a motor component having a one- or two-layer insulating coating structure according to the present invention does not use high-concentration inorganic additives such as TiO ₂ and / or SiO _2, so that the electrodeposition paint can be circulated. The production efficiency is good without clogging the filter. Furthermore, the method for manufacturing a motor component having a one-layer or two-layer insulating coating structure according to the present invention can improve workability without producing a mesh foot in the baking process during spray coating.

In the present invention, the motor component refers to components such as a motor core and a motor base which are made of a metal material and require an insulating coating.
A typical example of the motor core of the present invention is shown in FIGS. As the core 1, laminated silicon steel plates are usually used. An electrodeposition coating film 2 is provided on the core 1 by electrodeposition coating. In the present invention, the topcoat 3 can be provided on the electrodeposition coating film 2.
The electrodeposition paint used in the present invention is preferably a cationic electrodeposition paint.
Examples of the electrodeposition coating resin include epoxy resins, urethane resins, polyester resins, polyimide resins, and the like. Epoxy resins having excellent adhesion and corrosion resistance are particularly suitable. Since the epoxy resin used in the present invention is a cationic electrodeposition coating, it has been found that it is preferable to add acrylic cationic gel fine particles (acrylic microgel) that can be stably dispersed therein.
Regarding the thickness of the electrodeposition coating, it is important that the thinnest film thickness is 7 μm or more at the time of baking and drying. When the thinnest film thickness is less than 7 μm, the insulation characteristics are deteriorated, and in particular, a problem occurs in the insulation of the edge portion.
Also, if the average film thickness is too thick, not only will the time spent for electrodeposition coating increase, it will be difficult for the gas contained in the coating to escape, and there will be a probability of generating gas pinholes and fuclamis during baking and drying. In addition, the slot of the winding portion becomes narrow and the predetermined number of turns cannot be wound. The electrodeposition paint used in the present invention does not contain Pb and / or Sn, at least a compound containing Pb and / or Sn is not artificially added, and the Pb content is 1 ppm or less and the Sn content. Is preferably 3 ppm or less. Many commercially available electrodeposition paints contain trace amounts of Pb and / or Sn even when not artificially added.
A compound containing a large amount of Pb adversely affects the environment, and a compound containing a large amount of Sn may cause memory destruction due to scattering or evaporation of a compound containing Sn when the motor core is incorporated in a hard disk drive.
The film thickness of the electrodeposition coating film can be appropriately adjusted by adjusting the coating concentration, the coating liquid temperature, the voltage between the electrodes, the electrodeposition time, and the like.

The microgel used in the present invention is disclosed in, for example, Japanese Patent Application Laid-Open No. 05-179002, which is Patent Document 7, and Japanese Patent No. 2862577, which is Patent Document 8. That is, the microgel of the present invention is, for example, resin fine particles having an average particle diameter of about 0.2 to 1 μm, synthesized by an emulsion polymerization method, having a core / shell structure, and at least a shell portion having a three-dimensional cross-linked structure. .
A conceptual diagram of a microgel (microgel) is shown in FIG.
In the motor core of the present invention, a laminated silicon steel sheet is used as a typical example. However, since the electrodeposition paint penetrates deeply into the gap between the laminated silicon steel sheets, the paint component is confined to the inside, and the electrodeposition paint film is formed at 180 to 200 ° C. When baked, organic contaminants remaining between confined paint components and gaps are released as gas (see FIG. 5). In order to reduce pinholes due to the released gas and improve the outgas characteristics, it is necessary to release the gas sufficiently.
For this reason, it is desirable to use a thinner that evaporates along with gas that is easily generated in the paint component. In order to make it easy to close the pinhole which arises in the hardening process of an electrodeposition film | membrane, such a thinner can adjust the usage-amount suitably so that it may become a density | concentration and viscosity suitable for pinhole sealing.
In the present invention, it is preferable to cure the microgel at about 110 to 140 ° C. before baking the electrodeposition coating film at 180 to 200 ° C., but the thinner also evaporates at about 110 to 140 ° C. Then, it is preferable that it completely evaporates and does not remain.
Examples of the thinner used in the present invention include ketones, alcohols and ethers. In particular, methyl ethyl ketone and acetone can be preferably used. The amount of the thinner to be added is 1.5 to 8% by mass of the electrodeposition coating composition, and it is economically disadvantageous above this range, and no effect can be expected below this range.
In the electrodeposition coating film of the present invention, many pinholes are found on the laminated silicon steel sheet surface which is the side surface of the motor core as shown in FIG. 5 (upper). As mentioned above, since the harmful gas inside is removed by the thinner, it can be sufficiently put into practical use only by the electrodeposition coating film of the present invention, but for further improvement in performance and aesthetics, this It is desirable to form a top coat on top. FIG. 5 (bottom) shows the side of the motor core with the top coat applied. At this time, it is preferable that the top coat has an opaque color that can hide the base.

As the resin used for the spray coating insulating film for forming the top coat used in the present invention, a special paint capable of reacting with silicic acid to form a hard film is used. A typical example is a silicate-modified acrylic resin paint.
As the solvent for the coating material, a solvent mainly composed of isopropyl alcohol, diacetone alcohol, cyclohexanone, ethylene glycol monobutyl ether and added with n-butyl alcohol, butyl acetate, and formaldehyde is used. The special paint adjusted in this way is diluted with thinner and used for spray painting.
As the thinner, for example, xylene and ethylbenzene as main components to which ethyl acetate, n-butyl alcohol, toluene, acetic acid isobutyl ester and the like are added can be used. Further, the mixing ratio of the paint and the thinner is in the range usually used.
It is desirable that the silicate-modified acrylic resin paint of the top coat is colored with an opaque color such as gray. Coloring is performed by mixing a colorant into the top coat paint, and colors other than gray can be freely colored. The colored paint enables management of color coding of the product and can be confirmed at a glance at the time of assembling the motor, thereby improving the production efficiency.
In addition, when the silicate-modified acrylic resin paint does not contain an inorganic additive, the film hardness after curing reaches 5H, so this is convenient when a hard film is required. good.
Inorganic additives such as TiO ₂ and / or SiO ₂ act to improve the edge coverage, but in the electrodeposition coating process, the electrodeposition paint is circulated, so the ratio of the additive There is a problem that if the height is increased, the filter in the circulation path is likely to be clogged.
The present invention suppresses inorganic additives such as TiO ₂ and / or SiO ₂ as much as possible and improves edge coverage, and embodiments for this include many embodiments for those skilled in the art. However, the present invention is not limited to the examples described below. In the embodiment, the motor core will be described in detail, but it goes without saying that the motor base can be similarly used.
Furthermore, in the present invention, when a top coat is applied to form a double insulation structure, the post-treatment of electrode traces during electrodeposition coating is simultaneously solved.

Below, the Example by this invention and the comparative example are shown. In addition, for the addition of the microgel in the following Examples and Comparative Examples, a commercially available microgel dispersion containing 25 to 30% by mass of acrylic microgel, 70 to 65% by mass of water and 5% by mass of a solvent was used. . This microgel dispersion is a milky white liquid having characteristics of a specific gravity of 1 and a PH value of 5.
The electrodeposition coating film thickness is measured by cutting one of a plurality of salient poles protruding radially with respect to the center hole of the core 1 as shown in FIG. It was performed at the corner and flat part of the rectangular cut surface. That is, for each of A and B sides, the film thickness at the thinnest part of the two corners as shown in FIG. 6 is measured, and the average value is taken as the average film thickness at the thinnest part of the corner part. Since the film thickness of the flat part between the two corners is almost constant, the film thickness measured near the middle of the flat part was taken as the average film thickness of the flat part.

(Electrodeposition coating on the core)
An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive (ash content), and microgel was prepared. In this electrodeposition coating, 5.0 g of microgel dispersion (1.25 to 1.5 g of microgel), 13.3 g of inorganic additive, and 2.9 g of methyl ethyl ketone were blended per 100 g of coating.
A silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and the above paint. Since this paint is cationic, a DC voltage of 180 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 37.50 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 33.50 μm. The average film thickness at the thinnest part of the corner of the core surface (A side) is 9.38 μm, and the average film thickness of the thinnest part at the corner of the core surface (B side) is 9.38 μm. A coating film 2 was formed.
The edge coverage of the core surface (A side) was 25.01%, and the edge coverage of the core surface (B side) was 27.79%. Note that although there is a difference in film thickness between the A and B sides due to the influence of the positional relationship between the core and the electrode at the unidirectional electrode position, it can be adjusted to the minimum by optimizing it.

(Electrodeposition coating on the core)
An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive, and a microgel was prepared. The electrodeposition coating material was mixed with 8.5 g of microgel dispersion (2.13 to 2.55 g of microgel), 12.7 g of inorganic additive, and 2.3 g of methyl ethyl ketone per 100 g of coating material.
A silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and the above paint. Since this paint is cationic, a DC voltage of 180 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 26.25 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 27.25 μm. The average film thickness of the thinnest part of the corner of the core surface (A side) is 12.50 μm, and the average film thickness of the thinnest part of the core surface (B side) is 15.00 μm. A coating film 2 was formed.
The edge coverage of the core surface (A side) was 47.62%, and the edge coverage of the core surface (B side) was 54.55%.

(Electrodeposition coating on the core)
An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive, and a microgel was prepared. In this electrodeposition coating, 10.0 g of microgel dispersion (2.5 to 3.0 g of microgel) and 13.0 g of inorganic additive were blended per 100 g of coating.
The silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and a paint. Since this paint is cationic, a DC voltage of 180 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 45.00 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 46.m. The average film thickness of the thinnest part of the corner of the core surface (A side) is 33.75 μm, and the average film thickness of the thinnest part of the core surface (B side) is 28.13 μm. A coating film 2 was formed.
The edge coverage of the core surface (A side) was 75.0%, and the edge coverage of the core surface (B side) was 60.82%.

(Electrodeposition coating on the core)
An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive, and a microgel was prepared. In this electrodeposition coating, 12.0 g of microgel dispersion (3.00 to 3.60 g of microgel) and 13.1 g of inorganic additive were blended per 100 g of coating.
A silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and the above paint. Since this paint is cationic, a DC voltage of 180 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 46.50 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 44.50 μm. The average film thickness of the thinnest part of the corner of the core surface (A side) is 36.43 μm, and the average film thickness of the thinnest part of the corner of the core surface (B side) is 30.78 μm. A coating film 2 was formed.
The edge coverage of the core surface (A side) was 78.34%, and the edge coverage of the core surface (B side) was 69.17%.

This embodiment is a method for manufacturing a motor core having a two-layer insulating coating structure of “electrodeposition + topcoat”, which is close to a method suitable for mass production with appropriate insulation properties and film thickness dimensions and excellent quality. Is disclosed. (Electrodeposition coating on the core)
An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive, and a microgel was prepared. In this electrodeposition coating, 5.0 g of microgel dispersion (1.25 to 1.5 g of microgel) and 13.1 g of inorganic additive were blended per 100 g of coating.
The silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and a paint. Since this paint is cationic, a DC voltage of 90 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 26.50 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 23.50 μm. The average film thickness at the thinnest corner of the core surface (A side) is 6.63 μm, and the average film thickness at the thinnest corner of the core surface (B side) is 5.84 μm. A coating film 2 was formed.
The edge coverage of the core surface (A side) was 25.02%, and the edge coverage of the core surface (B side) was 25.01%.
(Top coat painting by spray painting)
The cores on which the electrodeposition coating film after baking is formed are arranged on a mesh plate (wire net), and spray coating is performed over the entire surface of the core.
The spray paint was prepared by the following method.
From 88.0% by mass of a solvent containing 12.0% by mass of a silicate-modified acrylic resin, isopropyl alcohol, diacetone alcohol, cyclohexanone, ethylene glycol monobutyl ether, and added with n-butyl alcohol, butyl acetate, and formaldehyde. This silicate-modified acrylic resin is diluted with a thinner containing 1.5 times the amount of xylene, ethylbenzene, and toluene as the main components, and ethyl acetate, n-butyl alcohol, and isobutyl acetate are added. Provided.
In spray coating, cores (coating objects) with an electrodeposition coating film that has been baked are arranged on the mesh play so that the outer peripheral portions do not touch each other, and the coating is sprayed onto the inner and outer surfaces of the core as well as the upper plane. Adjust the paint gun angle position and spray it while rotating the mesh plate to paint the entire surface uniformly.
Place the mesh plate on the spray-coated core for a while and leave it in a drying oven for about 15 minutes to cure at 180 ° C. After curing, reverse the cured core and rearrange the unpainted side up. Then, spray coating was performed again, and the coated core was placed again in a drying oven and heated at 180 to 190 ° C. for about 30 minutes to be fully cured.
The average film thickness of the flat portion of the core surface (A side) painted toward the electrode side is 23.26 μm, and the average film thickness of the flat portion of the core surface (B side) painted on the opposite side of the electrode side is 23. The average film thickness at the thinnest corner of the core surface (A side) was 7.30 μm, and the average film thickness at the thinnest corner of the core surface (B side) was 7.60 μm. It was.
The total edge coverage of the core surface (A side) was 27.9%, and the total edge coverage of the core surface (B side) was 28.81%.
The topcoat 3 had a pencil hardness of 4H. (See Figure 2)

In this example, there is provided a method for manufacturing a motor core having a two-layer insulating coating structure of “electrodeposition + topcoat” by a method suitable for mass production with appropriate insulation properties and film thickness dimensions and excellent quality. Disclose. (Electrodeposition coating on the core)
An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive, and a microgel was prepared. The electrodeposition coating material was mixed with 8.5 g of microgel dispersion (2.13 to 2.55 g of microgel) and 12.5 g of inorganic additive per 100 g of coating material.
The silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and a paint. Since this paint is cationic, a DC voltage of 90 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 27.50 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 35.50 μm. The average film thickness at the corner of the core surface (A side) was 18.13 μm, and the average film thickness at the corner of the core surface (B side) was 25.00 μm.
The edge coverage of the core surface (A side) was 65.93%, and the edge coverage of the core surface (B side) was 71.43%.
(Top coat painting by spray painting)
The cores on which the electrodeposition coating film after baking is formed are arranged on a mesh plate (wire net), and spray coating is performed over the entire surface of the core.
The spray paint was prepared by the following method.
From 88.0% by mass of a solvent containing 12.0% by mass of a silicate-modified acrylic resin, isopropyl alcohol, diacetone alcohol, cyclohexanone, ethylene glycol monobutyl ether, and added with n-butyl alcohol, butyl acetate, and formaldehyde. This silicate-modified acrylic resin is diluted with a thinner containing 1.5 times the amount of xylene, ethylbenzene, and toluene as the main components and added with ethyl acetate, n-butyl alcohol, and isobutyl acetate. Provided.
In spray coating, cores (coating objects) on which an electrodeposition coating film has been baked are arranged so that their outer peripheral parts do not touch each other on the mesh play, and the paint is sprayed onto the inner and outer surfaces and the upper plane of the core. Adjust the paint gun angle position and spray it while rotating the mesh plate to paint the entire surface uniformly.
Place the mesh plate on the spray-coated core for a while and leave it in a drying oven for about 15 minutes to cure at 180 ° C. After curing is complete, reverse the cured core and rearrange the unpainted side up. Then, spray coating was performed again, and the coated core was placed again in a drying oven and heated at 180 to 190 ° C. for about 30 minutes to be fully cured. The average film thickness of the flat part of the core surface (A side) electrodeposited toward the electrode side is 23.75 μm, and the average film thickness of the flat part of the core surface (B side) electrodeposited on the opposite side of the electrode side The electrodeposition coating film 2 having an average film thickness of 25.00 μm, an average film thickness at the corner of the core surface (A side) of 7.50 μm, and an average film thickness of the corner of the core surface (B side) of 7.50 μm is formed. It was.
The total edge coverage of the core surface (A side) was 50.01%, and the total edge coverage of the core surface (B side) was 54.17%.
The topcoat 3 had a pencil hardness of 4H. (See Figure 6)

In this example, there is provided a method for manufacturing a motor core having a two-layer insulating coating structure of “electrodeposition + topcoat” by a method suitable for mass production with appropriate insulation properties and film thickness dimensions and excellent quality. Disclose.

(Electrodeposition coating on the core)
An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive, and a microgel was prepared. In this electrodeposition coating, 10.0 g of microgel dispersion (2.5 to 3.0 g of microgel) and 12.9 g of inorganic additive were blended per 100 g of coating.
The silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and a paint. Since this paint is cationic, a DC voltage of 90 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average thickness of the flat portion of the core surface (A side) electrodeposited toward the electrode side is 30.30 μm, and the flat portion of the core surface (B side) electrodeposited on the opposite side of the electrode side The average film thickness was 38.24 μm, the average film thickness at the corner of the core surface (A side) was 22.73 μm, and the average film thickness at the corner of the core surface (B side) was 23.26 μm.
The edge coverage of the core surface (A side) was 75.01%, and the edge coverage of the core surface (B side) was 60.82%.
(Spray coating from above electrodeposition core <A side surface>)
In spray coating, cores (coating objects) on which an electrodeposition coating film has been baked are arranged so that their outer peripheral parts do not touch each other on the mesh play, and the paint is sprayed onto the inner and outer surfaces and the upper plane of the core. Adjust the paint gun angle position and spray the first spray painting while rotating the mesh plate to uniformly paint the entire surface.

Place the mesh plate on the spray-coated core for a while and leave it in a drying oven for about 15 minutes to cure at 180 ° C. After curing is complete, reverse the cured core and rearrange the unpainted side up. Then, the second spray coating was performed again, and the coated core was again placed in a drying oven and heated at 180 to 190 ° C. for about 30 minutes for main curing.
The spray paint was prepared by the following method.
From 88.0% by mass of a solvent containing 12.0% by mass of a silicate-modified acrylic resin, isopropyl alcohol, diacetone alcohol, cyclohexanone, ethylene glycol monobutyl ether, and added with n-butyl alcohol, butyl acetate, and formaldehyde. This silicate-modified acrylic resin is diluted with a thinner containing 1.5 times the amount of xylene, ethylbenzene, and toluene as the main components, and ethyl acetate, n-butyl alcohol, and isobutyl acetate are added. Provided.
The average film thickness of the flat part of the core surface (A side) electrodeposited toward the electrode side is 23.40 μm, and the average film thickness of the thinnest corner part of the core surface (A side) is 6.90 μm, The total edge coverage of the core surface (A side) was 55.18%.
The average film thickness of the flat part of the core surface (B side) electrodeposited on the opposite side to the electrode side is 22.10 μm, and the average film thickness of the thinnest corner of the core surface (B side) is 7.30 μm. The total edge coverage of the core surface (B side) was 50.65%.

In this example, there is provided a method for manufacturing a motor core having a two-layer insulating coating structure of “electrodeposition + topcoat” by a method suitable for mass production with appropriate insulation properties and film thickness dimensions and excellent quality. Disclose.

(Electrodeposition coating on the core)
An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive, and a microgel was prepared. In this electrodeposition coating material, 12.0 g of microgel dispersion (microgel 3.0 to 3.6 g) and 13.1 g of inorganic additive were blended per 100 g of coating material.
The silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and a paint. Since this paint is cationic, a DC voltage of 90 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat portion of the core surface (A side) electrodeposited toward the electrode side is 31.50 μm, and the flat portion of the core surface (B side) electrodeposited on the opposite side of the electrode side The average film thickness was 29.50 μm, the average film thickness at the corner of the core surface (A side) was 24.68 μm, and the average film thickness at the corner of the core surface (B side) was 20.41 μm.
The edge coverage of the core surface (A side) was 78.35%, and the edge coverage of the core surface (B side) was 69.19%.
(Spray coating from above electrodeposition core <A side surface>)
In spray coating, cores (coating objects) with an electrodeposition coating film that has been baked are arranged on the mesh play so that the outer peripheral portions do not touch each other, and the coating is sprayed onto the inner and outer surfaces of the core as well as the upper plane. Adjust the paint gun angle position and spray the first spray painting while rotating the mesh plate to uniformly paint the entire surface.
Place the mesh plate on the spray-coated core for a while and leave it in a drying oven for about 15 minutes to cure at 180 ° C. After curing, reverse the cured core and rearrange the unpainted side up. Then, the second spray coating was performed again, and the coated core was again placed in a drying oven and heated at 180 to 190 ° C. for about 30 minutes for main curing.
The spray paint was prepared by the following method.
From 88.0% by mass of a solvent containing 12.0% by mass of a silicate-modified acrylic resin, isopropyl alcohol, diacetone alcohol, cyclohexanone, ethylene glycol monobutyl ether, and added with n-butyl alcohol, butyl acetate, and formaldehyde. This silicate-modified acrylic resin is diluted with a thinner containing 1.5 times the amount of xylene, ethylbenzene, and toluene as the main components, and ethyl acetate, n-butyl alcohol, and isobutyl acetate are added. Provided.
The average film thickness of the flat part of the core surface (A side) electrodeposited toward the electrode side is 23.45 μm, and the average film thickness of the thinnest corner part of the core surface (A side) is 7.50 μm, The total edge coverage of the core surface (A side) was 58.56%.
The average film thickness of the flat part of the core surface (B side) electrodeposited on the opposite side to the electrode side is 22.20 μm, and the average film thickness of the thinnest corner of the core surface (B side) is 7.50 μm. The total edge coverage of the core surface (B side) was 53.98%.

(Comparative Example 1)
(Electrodeposition coating on the core)
An electrodeposition coating containing an amino-modified epoxy resin and an inorganic additive (Pb content: 1 ppm or less, Sn content: 3 ppm or less) was prepared. Instead of adding the microgel, the amount of the inorganic additive was increased and 30.6 g per 100 g of the paint was blended.
The silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and a paint. Since this paint is cationic, a DC voltage of 300 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 58.75 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 57.75 μm. The average film thickness at the thinnest corner of the core surface (A side) is 6.25 μm, and the average film thickness at the thinnest corner of the core surface (B side) is 7.50 μm. A coating film 2 was formed.
The edge coverage of the core surface (A side) was 10.64%, and the edge coverage of the core surface (B side) was 13.04%.

(Comparative Example 2)
(Electrodeposition coating on the core)
An electrodeposition paint containing an amino-modified epoxy resin and an inorganic additive was prepared. The inorganic additive contained 13.70 g per 100 g of paint. Microgel was not added and the amount of mineral additive was reduced for comparison.
The silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and a paint. Since this paint is cationic, a DC voltage of 180 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 23.75 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 26.75 μm. The average film thickness of the thinnest part of the corner of the core surface (A side) is 5.00 μm, and the average film thickness of the thinnest part of the corner of the core surface (B side) is 4.38 μm. A coating film 2 was formed.
The edge coverage of the core surface (A side) was 21.05%, and the edge coverage of the core surface (B side) was 16.69%.
(Comparative Example 3)

(Electrodeposition coating on the core)
An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive, and a microgel was prepared. In this electrodeposition coating, 1.5 g of microgel dispersion (microgel 0.38 to 0.45 g) was blended per 100 g of coating material, and 14.3 g of inorganic additive was blended per 100 g of coating material.
A silicon steel-based core 1 was electrodeposited in accordance with the present invention using an amino-modified epoxy resin as a vehicle and the above electrodeposition paint. Since this paint is cationic, a DC voltage of 180 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was placed in a drying oven while being held by an electrodeposition jig, preliminarily cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 50.00 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 42 .mu.m. The average film thickness of the thinnest part of the corner of the core surface (A side) is 4.38 μm, and the average film thickness of the thinnest part of the core surface (B side) is 4.38 μm. A coating film 2 was formed.
The edge coverage of the core surface (A side) was 8.76%, and the edge coverage of the core surface (B side) was 10.31%.

(Comparative Example 4)

An electrodeposition coating material (Pb content: 1 ppm or less, Sn content: 3 ppm or less) containing an amino-modified epoxy resin, an inorganic additive, and a microgel was prepared. In this electrodeposition coating, 1.5 g of microgel dispersion (microgel 0.38 to 0.45 g) and 14.0 g of inorganic additive were blended per 100 g of coating.
The silicon steel core 1 was electrodeposited according to the present invention using an amino-modified epoxy resin as a vehicle and a paint. Since this paint is cationic, a DC voltage of 90 V was applied between the object to be coated as a cathode and an anode as a container. The temperature of the coating liquid was 27 ° C. and the electrodeposition coating time was 4 minutes.
(Baking of electrodeposition coating film)
Subsequently, the coated product was held in an electrode and placed in a drying oven, pre-cured at 140 ° C. for about 25 minutes, then heated to 200 ° C. and heated for about 20 minutes for main curing.
By this treatment, the average film thickness of the flat part of the core surface (A side) facing the electrode side is 28.44 μm, and the average film thickness of the flat part of the core surface (B side) opposite to the electrode side is 25.44 μm. 30 μm, the average film thickness at the thinnest corner of the core surface (A side) is 2.30 μm, and the average film thickness at the thinnest corner of the core surface (B side) is 2.58 μm. A coating film 2 was formed.
The edge coverage of the core surface (A side) was 8.09%, and the edge coverage of the core surface (B side) was 10.20%.
(Top coat painting by spray painting)
The cores on which the electrodeposition coating film after baking is formed are arranged on a mesh plate (wire net), and spray coating is performed over the entire surface of the core.
The spray paint was prepared by the following method.
From 88.0% by mass of a solvent containing 12.0% by mass of a silicate-modified acrylic resin, isopropyl alcohol, diacetone alcohol, cyclohexanone, ethylene glycol monobutyl ether, and added with n-butyl alcohol, butyl acetate, and formaldehyde. This silicate-modified acrylic resin is diluted with a thinner containing 1.5 times the amount of xylene, ethylbenzene, and toluene as the main components, and ethyl acetate, n-butyl alcohol, and isobutyl acetate are added. Provided.
In spray coating, cores (objects to be coated) on which electrodeposited coating films have been baked are arranged on a mesh plate so that their outer peripheral parts do not touch each other, and paint is sprayed onto the inner and outer surfaces and the upper plane of the core. The spray gun angle position is adjusted in this way, and spray coating while rotating the mesh plate to uniformly paint the entire surface.
Place the mesh plate on the spray-coated core for a while and leave it in a drying oven for about 15 minutes to cure at 180 ° C. After curing, reverse the cured core and rearrange the unpainted side up. Then, spray coating was performed again, and the coated core was placed again in a drying oven and heated at 180 to 190 ° C. for about 30 minutes to be fully cured. The average film thickness of the flat part of the core surface (A side) electrodeposited toward the electrode side is 24.26 μm, and the average film thickness of the flat part of the core surface (B side) electrodeposited on the opposite side of the electrode side Is 25.00 μm, the average film thickness at the thinnest corner of the core surface (A side) is 7.00 μm, and the average film thickness at the thinnest corner of the core surface (B side) is 6.80 μm. Met.
The total edge coverage of the core surface (A side) was 17.65%, and the total edge coverage of the core surface (B side) was 18.65%.
The topcoat 3 had a pencil hardness of 4H.
Table 1 shows the results of the insulating coatings of the motor parts obtained in Examples 1 to 8 and Comparative Examples 1 to 4.

ＭｊＲ１：マイクロジェル分散体の添加量 質量％（電着塗料１００ｇ当りに対して、添加する量）
ＭｊＲ２：マイクロジェルの添加量 質量％（電着塗料１００ｇ当りに対して添加する量）
ＥＤＦ：電着塗装の平坦部の平均膜厚(μm)上欄Ａサイド面、下欄Ｂサイド面
ＥＤＥ：電着塗装の角部の一番薄いところの平均膜厚(μm) 上欄Ａサイド面、下欄Ｂサイド面
ＡＳＨ：被膜中の灰分量（電着塗料１００ｇ当りｇ数）
ＥＣＲ：エッジカバー率（%）［角部の一番薄いところの平均膜厚／平坦部の平均膜厚］で定義され、電極面に向いた面（Ａ面）電極面に向いていない面（Ｂ面）における角部の一番薄いところの平均膜厚／平坦部の平均膜厚の２つのデータを示す(電極位置の調整でＡ面、Ｂ面の差異を最小限にすることが出来る)。
ＴＣＦ：トップコートの平坦部の平均膜厚(μm) 上欄Ａサイド面、下欄Ｂサイド面
ＴＣＦＥ：トップコートの角部の平均膜厚(μm) 上欄Ａサイド面、下欄Ｂサイド面
ＴＥＣＲ：トータルエッジカバー率（%）［電着塗装膜＋トップコートのエッジカバー率］
実施例１〜実施例８及び比較例１〜比較例４で得られたモータ用部品の特性を表２に示す。

MjR1: Addition amount of microgel dispersion Mass% (Amount to be added per 100 g of electrodeposition paint)
MjR2: Addition amount of microgel Mass% (Amount to be added per 100 g of electrodeposition paint)
EDF: Average film thickness (μm) of the flat part of electrodeposition coating Upper column A side surface, Lower column B side surface EDE: Average film thickness (μm) of the thinnest corner of electrodeposition coating Upper column A side Surface, lower column B side surface ASH: ash content in coating (g per 100 g of electrodeposition paint)
ECR: Edge coverage ratio (%) [average thickness at the thinnest corner / average thickness at the flat portion], a surface facing the electrode surface (A surface), a surface not facing the electrode surface ( (B surface) shows the two data of the average film thickness at the thinnest corner of the corner / average film thickness of the flat part (adjustment of the electrode position can minimize the difference between A surface and B surface) .
TCF: Average thickness of the flat part of the top coat (μm) Upper column A side surface, lower column B side surface TCFE: Average film thickness of the top coat corner (μm) Upper column A side surface, lower column B side surface TECR: Total edge coverage (%) [Edge coating ratio of electrodeposition coating film + topcoat]
Table 2 shows the characteristics of the motor parts obtained in Examples 1 to 8 and Comparative Examples 1 to 4.

絶縁特性：
全周面検査３００Ｖ ＯＫ率 ◎１００％○９８％以上 △９０％ X９０％以下
耐腐食性：
◎熱水テスト１００時間以上合格
○熱水テスト５０〜１００時間合格
△熱水テスト５０時間合格
巻線保持性：
◎巻き線による角部に凹みなし
○巻き線による角部凹みが多少見られる
△巻き線による角部凹みが見られる

総合特性
◎優
○良
△可
×不可

表２の結果から、本発明は塗料組成物中の添加剤の一部を電着塗装用塗料組成物の１．０〜３．６質量％に相当するアクリル系マイクロジェルに置き換えた電着塗装用塗料組成物を用いることにより、電着塗装のみでもある程度の水準の特性を確保することができ、トップコートを被覆すると、さらに特性を上げることが出来ることが判明した。また、アクリル系マイクロジェルの添加量が電着塗装用塗料組成物の１．０質量％未満の比較例３と４では実施例と同等の結果は得られなかった。さらに、アクリル系マイクロジェルが３．６質量％で十分な結果が得られ、それ以上マイクロジェルの添加量を多くしてもコスト高になるばかりか、塗装面の品質が悪くなる場合もあるため、本発明では３．６質量％を上限値とした。
したがって、三層絶縁構造（特許文献８）のモータ用部品に比して、製造工程を大幅に少なくすることが出来、量産効果を上げることが出来ることが判明した。

Insulation characteristics:
Full surface inspection 300V OK rate ◎ 100% ○ 98% or more △ 90% X90% or less Corrosion resistance:
◎ Hot water test passed 100 hours or more ○ Hot water test passed 50 to 100 hours △ Hot water test passed 50 hours Winding retention:
◎ No concavity at the corners due to winding ○ Some corner dents due to winding are seen △ Corner dents due to winding are seen

Overall characteristics ◎ Excellent ○ Good △ Yes × No

From the results in Table 2, the present invention is an electrodeposition coating in which a part of the additives in the coating composition is replaced with acrylic microgels corresponding to 1.0 to 3.6% by mass of the coating composition for electrodeposition coating. It was found that by using the coating composition for coating, a certain level of characteristics can be secured only by electrodeposition coating, and the characteristics can be further improved by covering the top coat. Further, in Comparative Examples 3 and 4 in which the amount of the acrylic microgel added was less than 1.0% by mass of the electrodeposition coating composition, the same results as in the examples were not obtained. Furthermore, sufficient results are obtained with 3.6% by mass of acrylic microgel, and even if the amount of microgel added is increased further, the cost is increased and the quality of the coated surface may be deteriorated. In the present invention, the upper limit value was 3.6% by mass.
Therefore, it has been found that the manufacturing process can be significantly reduced and the mass production effect can be improved as compared with the motor component having the three-layer insulation structure (Patent Document 8).

The motor component having a one- or two-layer insulating coating structure of the present invention and its manufacturing method can reliably provide a quality product that can be put to practical use by a simple manufacturing process, and the defective product rate. This is a manufacturing method suitable for mass production. Therefore, it can contribute to manufacture of a small motor and has high industrial applicability.

Explanatory drawing of the electrodeposition coating film of the core of the present invention Explanatory drawing of the topcoat film by the electrodeposition coating film and spray coating of the core of the present invention Explanatory drawing of the manufacturing method of the two-layer insulation coating-film structure core of this invention Conceptual diagram of microgel Photo of coating with electrodeposition coating film and topcoat film on the side of laminated silicon steel sheet core Sectional photograph of the core of Example 6

Explanation of symbols

1 Motor core 2 Electrodeposition coating 3 Top coat with spray coating

Claims (14)

Electrodeposition on the surface of motor parts using an electrodeposition coating composition in which some of the additives in the coating composition containing an epoxy film-forming polymer, aqueous solvent and additives are replaced with acrylic microgels. A motor part having a single-layer insulating coating structure formed by forming a coating film. The coating composition for electrodeposition coating is an electrodeposition coating containing 1.5 to 8% by weight of thinner of the coating composition for electrodeposition coating, and the inorganic component in the additive is 15 of the coating composition for electrodeposition coating. The motor component having a single-layer insulating coating structure according to claim 1, wherein the component is a mass% or less. The motor component having a single-layer insulating coating structure according to claim 1 or 2, wherein the amount of the acrylic microgel added is 1.0 to 3.6% by mass of the coating composition for electrodeposition coating. The motor component having a single-layer insulating coating structure according to any one of claims 1 to 3, wherein the electrodeposition coating composition has a Pb content of 1 ppm or less and an Sn content of 3 ppm or less. A two-layer insulating coating comprising a top coat film formed by spray coating on a surface of a motor component formed with the electrodeposition coating film according to any one of claims 1 to 4. Motor parts with a membrane structure. 6. The motor part having a two-layer insulating coating structure according to claim 5, wherein the film forming polymer of the top coat by spray coating is a silicate-modified acrylic resin paint. The motor part having a two-layer insulating coating structure according to claim 6, wherein the silicate-modified acrylic resin coating does not contain an inorganic additive. The motor component having a two-layer insulating coating film structure according to claim 6, wherein the silicate-modified acrylic resin paint contains only 1% or less of SiO ₂ particles. The motor component having a two-layer insulating coating structure according to any one of claims 6 to 8, wherein the silicate-modified acrylic resin coating is colored with an opaque color. A motor component was connected as a cathode, and a coating composition for electrodeposition coating in which a part of the additive in the coating composition containing an epoxy-based film-forming polymer, an aqueous solvent and an additive was replaced with an acrylic microgel was placed. Immerse it in the electrodeposition paint tank, apply the DC voltage of 80-300V with the electrodeposition paint tank as the anode, apply the electrodeposition coating, pull up from the electrodeposition paint tank, wash with water, heat cure the electrodeposition coating film A method for producing a motor component having a single-layer insulating coating structure, wherein: 11. The single-layer insulating coating structure according to claim 10, wherein the electrodeposition coating film is cured by heating at 110 to 140 ° C. for 10 to 30 minutes and baked at 180 to 200 ° C. for 20 to 40 minutes. A method for manufacturing a motor component. A motor component was connected as a cathode, and a coating composition for electrodeposition coating in which a part of the additive in the coating composition containing an epoxy-based film-forming polymer, an aqueous solvent and an additive was replaced with an acrylic microgel was placed. After dipping in the electrodeposition paint tank, applying a DC voltage of 80-300V with the electrodeposition paint tank as the anode and applying the electrodeposition, it is pulled up from the electrodeposition paint tank, washed with water, heat cured, and then silicic acid. A method for producing a motor component having a two-layer insulating coating structure, characterized in that a salt-modified acrylic resin coating is provided by spray coating to provide a top coat film, and the top coat film is heated and cured. When the electrodeposition coating film is heat-cured, it is held at 110 to 140 ° C. for 10 to 30 minutes, baked at 180 to 200 ° C. for 20 to 35 minutes, and the top coat film is baked at 180 to 200 ° C. for 20 to 40 minutes. A method for manufacturing a motor component having a two-layer insulating coating structure according to claim 12. After motor parts are heat-cured after electrodeposition coating, they are placed on a wire mesh with a distinction between upper and lower, spray-coated from above, then heated to 180-200 ° C. to form a top coat film, 13. The two-layer insulating coating film according to claim 12, wherein the motor component is placed upside down, sprayed again from above, and then heated to 180 to 200 [deg.] C. to form a topcoat film. A method for manufacturing a motor component having a structure.

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