阅读说明：本技术 电机用线圈及含有该线圈的电机 (Coil for motor and motor containing same ) 是由 尹勇 于 2019-09-19 设计创作，主要内容包括：本发明涉及电机用线圈及含有该线圈的电机,所述线圈包括：由漆包线卷绕而成的卷绕体、和在所述卷绕体上涂布浸渍清漆并固化而形成的浸渍层,所述漆包线包括导体、包覆于所述导体上的漆皮层、和包覆于所述漆皮层上的自粘层,所述浸渍清漆由含有浸渍树脂的溶液和第一经硅烷偶联剂处理的胶体纳米二氧化硅溶液混合而得,所述自粘层由自粘清漆固化而得,所述自粘清漆由含有自粘树脂的溶液和第二经硅烷偶联剂处理的胶体纳米二氧化硅溶液混合而得。根据本发明,可以提供一种兼具优异的加工性和电气特性的线圈。(The invention relates to a coil for a motor and a motor including the same, the coil includes: the enameled wire comprises a conductor, an enamel layer coated on the conductor and a self-adhesive layer coated on the enamel layer, wherein the impregnating varnish is obtained by mixing a solution containing impregnating resin and a colloidal nano silica solution treated by a first silane coupling agent, the self-adhesive layer is obtained by curing a self-adhesive varnish, and the self-adhesive varnish is obtained by mixing a solution containing self-adhesive resin and a colloidal nano silica solution treated by a second silane coupling agent. According to the present invention, a coil having both excellent workability and electrical characteristics can be provided.)

1. A coil, comprising:

a wound body formed by winding an enameled wire, and

an impregnation layer formed by coating and curing an impregnation varnish on the wound body,

the enameled wire comprises a conductor, an enamel layer coated on the conductor and a self-adhesive layer coated on the enamel layer,

the impregnating varnish is obtained by mixing a solution containing impregnating resin and a first colloidal nano-silica solution treated by a silane coupling agent,

the self-adhesive layer is obtained by curing self-adhesive varnish,

the self-adhesive varnish is prepared by mixing a solution containing self-adhesive resin and a second colloidal nano-silica solution treated by a silane coupling agent.

2. Coil according to claim 1, wherein the impregnating resin is a structure cured by radical polymerization of unsaturated groups using a peroxide, preferably an unsaturated polyester.

3. The coil according to claim 1 or 2, wherein in the first silane coupling agent-treated colloidal nanosilica solution, the first silane coupling agent is a silane containing an unsaturated double bond, preferably a silane containing a vinyl group, more preferably at least one selected from vinyltrimethoxysilane and vinyltriethoxysilane.

4. A coil according to any one of claims 1 to 3, characterized in that the amount of nanosilica added to the impregnating varnish is between 10 and 100phr, preferably between 20 and 70phr, with respect to the impregnating resin.

5. The coil according to any one of claims 1 to 4, wherein the self-adhesive resin is at least one selected from epoxy resins, polyvinyl butyral and polyamides, and more preferably at least one selected from phenoxy resins, bisphenol A epoxy resins, bisphenol S epoxy resins, bisphenol F epoxy resins and alicyclic epoxy resins.

6. The impregnating varnish according to any one of claims 1 to 5, wherein in the second silane coupling agent-treated colloidal nanosilica solution, the second silane coupling agent is an epoxy group-containing silane, preferably at least one selected from the group consisting of 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 3-glycidoxypropyltriethoxysilane.

7. A coil according to any one of claims 1 to 6, characterized in that the amount of nanosilica added to the self-adhesive varnish is 10 to 50phr, preferably 20 to 40phr, with respect to the self-adhesive resin.

8. The impregnating varnish according to any one of claims 1 to 7, wherein the solvent in the second silane coupling agent-treated colloidal nanosilica solution is selected from at least one of cyclohexanone, methyl ethyl ketone, gamma-butyrolactone.

9. An electrical machine comprising a coil as claimed in any one of claims 1 to 8.

Technical Field

The invention belongs to the field of high polymer materials, and particularly relates to impregnating varnish and self-adhesive varnish for coils and coils obtained by using the impregnating varnish and/or the self-adhesive varnish.

Background

In recent years, in order to achieve miniaturization and high output, a motor for EV (Electric Vehicle) and HEV (Hybrid Electric Vehicle) is required to apply a very high voltage, and to have both high electrical characteristics and heat resistance.

The electrical characteristics specifically mean both: high PDIV (partial discharge initiation voltage) property, and resistance to surge (surge) deterioration (also referred to as corona resistance) of the coating film even if PDIV is generated.

In order to obtain (i) high PDIV properties, a means of filling the space between the wires of the coil for the motor with an impregnating varnish or a self-adhesive varnish is effective in addition to using a material having a low dielectric constant.

However, since the impregnating varnish is applied from the outside after the motor is assembled, the impregnating varnish does not necessarily enter all the wires, and the self-adhesive varnish functions only to fill the contact portions, and therefore, it is preferable to use them in combination.

However, even when the space between the lines is filled with the impregnating varnish or the self-adhesive varnish, PDIV is generated when a voltage equal to or higher than a certain level is applied, and if PDIV is generated, the coating is eroded with time and broken.

To avoid this, it is desirable to have surge-resistant characteristics for both the impregnating varnish and the self-adhesive material.

Generally, a method of mixing a filler such as silica or titania is known to impart surge resistance to a polymer material, but if the filler is simply added and mixed, it is difficult to impart processability to severe motor processing. The self-adhesive varnish has a phenomenon that the film is broken due to insufficient toughness during coil processing, and the impregnating varnish has a problem that the film is broken during motor vibration.

Disclosure of Invention

Technical problem to be solved by the invention

In view of the above problems, a first object of the present invention is to provide an impregnating varnish having excellent storage stability, processability and electrical characteristics. A second object of the present invention is to provide a self-adhesive varnish having excellent storage stability, processability and electrical characteristics. A third object of the present invention is to provide a coil having both excellent workability and electrical characteristics.

Means for solving the problems

The first invention provides an impregnating varnish obtained by mixing a solution containing an impregnating resin and a colloidal nano silica solution treated with a silane coupling agent.

Here, "colloidal nanosilica" (or called colloidal silica, colloidal silica dispersion, silicone sol) refers to a colloid in which nano-sized silica (or called nano-silica) has been dispersed in a solvent. The "colloidal nano-silica solution treated with a silane coupling agent" is obtained by treating the above colloidal nano-silica with a silane coupling agent.

According to the first invention, since the affinity between silica and the impregnating resin can be improved by treating silica dispersed in a size of sol with the silane coupling agent, the silica and the impregnating resin can be easily and uniformly mixed, and the silica maintains the same particle size even after being mixed with the solution containing the impregnating resin, the silica can be more uniformly dispersed in the solution containing the impregnating resin, and the impregnating varnish has excellent storage stability. In the impregnated layer obtained using the impregnating varnish, silica is uniformly dispersed in the impregnating resin in a nano-size, and therefore the impregnated layer has excellent processability and electrical characteristics.

The impregnating resin may be a structure in which an unsaturated group or the like is radically polymerized using a peroxide to be cured.

Preferably, the silane coupling agent is a silane containing an unsaturated double bond, more preferably a silane containing a vinyl group, and further preferably at least one selected from vinyltrimethoxysilane and vinyltriethoxysilane. By surface-modifying the colloidal nanosilica with unsaturated double bonds such as vinyl groups, not only the stability of the impregnating varnish is further improved, but also the binding force between the resin and the silica after curing is further improved, whereby a very tough cured product can be obtained.

Preferably, the amount of the nanosilica added is 10 to 50phr relative to the impregnating resin.

A second aspect of the present invention provides a coil including an impregnated layer obtained by using any one of the impregnating varnishes.

A third invention provides a motor including the coil of the second invention.

The fourth invention provides a self-adhesive varnish obtained by mixing a solution containing a self-adhesive resin and a colloidal nanosilica solution treated with a silane coupling agent.

According to the fourth aspect of the present invention, since the affinity between the silica and the self-adhesive resin can be improved by the silane coupling agent treatment of the silica dispersed in the size of sol and the silane coupling agent treatment, the silica and the self-adhesive resin can be easily and uniformly mixed, and the silica maintains the same particle size even after being mixed with the solution containing the self-adhesive resin, so that the silica can be more uniformly dispersed in the solution containing the self-adhesive resin, and the self-adhesive varnish has excellent storage stability. In the self-adhesive layer obtained using the self-adhesive varnish, silica is uniformly dispersed in a self-adhesive resin in a nano size, and therefore the self-adhesive layer has excellent processability and electrical characteristics.

The self-adhesive resin can be selected from at least one of phenoxy resin, polyvinyl butyral and polyamide.

Preferably, the silane coupling agent is an epoxy group-containing silane, more preferably at least one selected from the group consisting of 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane and 3-glycidoxypropyltriethoxysilane. By using the epoxy silane coupling agent, the compatibility with a self-adhesive resin (e.g., phenoxy resin) can be improved, and a very tough cured product can be obtained by introducing a curing system at the same time as the self-adhesive treatment.

Preferably, the amount of the nanosilica added is 10 to 50phr relative to the self-adhesive resin.

Preferably, the solvent in the colloidal nano-silica solution treated by the silane coupling agent is cyclohexanone. By using cyclohexanone, the compatibility with the self-adhesive resin can be further improved.

A fifth invention provides a coil comprising a self-adhesive layer obtained using any of the self-adhesive varnishes described above.

A sixth invention provides a motor including the coil of the fifth invention.

A seventh invention provides a coil, comprising: the enameled wire comprises a conductor, an enamel layer covering the conductor and a self-adhesive layer covering the enamel layer, wherein the self-adhesive layer is obtained by curing any self-adhesive varnish.

According to the seventh invention, the breakage of the self-adhesive layer does not occur at the time of coil processing, and the breakage of the impregnated layer does not occur at the time of coil vibration, that is, the coil has excellent workability, and the coil also has excellent electrical characteristics.

An eighth invention provides a motor having the coil of the seventh invention.

Effects of the invention

According to the present invention, there can be provided an impregnating varnish having excellent storage stability, processability and electrical characteristics, a self-adhesive varnish having excellent storage stability, processability and electrical characteristics, and a coil having excellent processability and electrical characteristics.

Drawings

Fig. 1 is a schematic cross-sectional view of an enamel wire according to an embodiment of the present invention.

Detailed Description

The present invention is further described below in conjunction with the following embodiments and the accompanying drawings, it being understood that the drawings and the following embodiments are illustrative of the invention only and are not limiting thereof.

Fig. 1 is a schematic cross-sectional view of an enamel wire according to an embodiment of the present invention. As shown in fig. 1, the enamel wire 1 includes a conductor 2, an enamel layer 3 coated on the conductor 2, and a self-adhesive layer 4 coated on the enamel layer 3.

The material of the conductor 2 is not particularly limited, and a conductor material widely used in enameled wires, for example, copper, can be used.

The material of the enamel layer 3 is not particularly limited, and insulating varnish widely used in enameled wires can be used. Examples thereof include polyimide resin insulating varnish, polyesterimide resin insulating varnish, polyamideimide resin insulating varnish, H-type polyester resin insulating varnish, and the like. The paint layer 3 may be one layer or may be a plurality of layers. When the paint layer 3 is a plurality of layers, different insulating coatings can be adopted for each layer. For example, the paint skin layer 3 may have a two-layer structure of a polyester imide resin layer/a polyamide imide resin layer.