34results about How to "High partial discharge inception voltage" patented technology

This invention relates to a polyamide-imide resin insulating varnish and an insulated wire using the polyamide-imide resin insulating varnish. A polyamide-imide resin insulating varnish includes an aromatic diamine component, an aromatic diisocyanate component, an acid component including an aromatic tricarboxylic acid anhydride, and a solvent. The aromatic diamine component includes an aromatic diamine with three or more benzene rings and an aromatic diamine with two or less benzene rings. The polyamide-imide resin insulating varnish allows reduction in permittivity while retaining its heat resistance, mechanical performance, oil resistance etc. for producing a covering with a high partial discharge inception voltage.

An inverter surge-resistant insulated wire, having at least one baked enamel layer around the outer periphery of a conductor, and an extrusion-coated resin layer at the outside of the baked enamel layer, wherein a total thickness of the baked enamel layer and the extrusion-coated resin layer is 50 μm or more, a thickness of the baked enamel layer is 60 μm or less, and a thickness of the extrusion-coated resin layer is 200 μm or less, wherein the minimum of tensile elastic modulus of the extrusion-coated resin layer at a range of 25 to 250° C. is 100 MPa or more, wherein a dielectric constant of an insulation layer having a combination of the baked enamel layer and the extrusion-coated resin layer is 3.5 or less at 25° C. and 5.0 or less at 250° C., and wherein a relation between dielectric constant (∈1′) of the baked enamel layer at 250° C. and dielectric constant (∈2′) of the extrusion-coated resin layer at 250° C. satisfies (∈2′ / ∈1′)>1.

There is provided an insulated wire including a wire conductor and at least one extruded insulation layer formed on the wire conductor. The at least one extruded insulation layer is made of a phase separated resin composition including: a resin (A) including polyether ether ketone as a continuous phase; and a resin (B) with a relative dielectric constant of 2.6 or less as a dispersed phase.

An insulated wire having a rectangular shaped cross-section, containing: a conductor having a rectangular shaped cross-section; and an insulating layer coated on the conductor, in which the insulating layer has a foamed layer composed of a thermosetting resin containing bubbles, the cross-section of the insulating layer has a shape composed of a flat portion and a corner portion, and the insulating layer satisfies the relationship represented by the following formula:∈1<3 and (T2 / ∈2)>(T1 / ∈1)wherein T1 [μm] represents a thickness of the flat portion; ∈1 represents a relative dielectric constant of the flat portion; T2 [μm] represents a thickness of the corner portion; and ∈2 represents a relative dielectric constant of the corner portion, and an electric / electronic equipment, a motor, or a transformer, using the insulated wire.

Provided is an insulated wire, which is one having a high partial discharge inception voltage even if an insulated coating layer disposed on a conductor is only made of an insulated film. The insulated film is formed in the insulated coating layer around the conductor. The insulating film is formed by applying and baking the polyamide-imide resin insulating material having a low dieleltric constant and made of divalent aromatic diamines having three or more aromatic rings.

An object of the present invention is to provide an insulating paint that can obtain an insulating coating that has a high partial discharge inception voltage and hardly causes insulation breakdown even when an inverter surge voltage occurs, and an insulated wire using the same. The insulating paint of the present invention is characterized in that, in the insulating paint obtained by mixing a polyamide-imide resin paint containing a solvent and a polyamide-imide resin, and an organosol, the polyamide-imide resin paint is as follows Formation: In the presence of an azeotropic solvent, a diamine component including an aromatic diamine having a divalent aromatic group having three or more aromatic rings and an acid component are subjected to a synthesis reaction to obtain a resin component (X) , making the isocyanate component (Y) containing the diisocyanate (Y1) which has a curved structure in a molecule|numerator, and the said resin component (X) carry out synthesis reaction.

A insulated wire includes a conductor, and an insulating coating on a periphery of the conductor. The insulating coating includes an insulating film formed by applying and baking a polyester imide resin insulating coating material, and the insulating film has a relative permittivity of less than 3.5 both in a dried state and in a moisture-absorbed state. The insulating film is formed by applying and baking a polyester imide resin insulating coating material including an imide dicarboxylic acid and an alcohol component, the imide dicarboxylic acid being obtained by synthesizing a diamine component including aromatic diamine having not less than three aromatic rings and an acid component including aromatic tricarboxylic acid anhydride.

Provided is an insulated electric wire comprising a conductor, an insulation layer including a foam heat-curable resin and which covers the outer circumferential surface of the conductor, and an outside non-foam insulation layer that covers the outer circumferential surface of the insulation layer. The thickness deformation rate of the insulation layer when a pressure of 1 MPa is applied at 25°C is 15%-50%. The pencil hardness of the outside non-foam insulation layer is at least 4H and the ratio between the insulation layer thickness and the outside non-foam insulation layer thickness is 20:80-80:20. Also provided is a motor having this insulated electric wire wound around a stator slot, in a state in which pressure is applied in the direction in which the outer diameter of the insulated electric wire decreases, and the thickness of the insulation layer is reduced.

An insulated wire includes a conductor, and an insulating covering layer formed on a periphery of the conductor and including two or more insulating coatings. The insulating coatings include a polyamide-imide resin insulating material represented by chemical formula 1:where R indicates a divalent aromatic diamine including three or more aromatic rings. The insulating coatings are formed by applying and baking the polyamide-imide resin insulating material, and the polyamide-imide resin insulating material is obtained by reacting an imide group containing dicarboxylic acid with a diisocyanate, the imide group containing dicarboxylic acid being obtained by dehydration reaction of a diamine comprising a divalent aromatic diamine including three or more aromatic rings with an acid using an azeotropic solvent.

Provided are a silicon nitride substrate and a silicon nitride circuit board with excellent electrical characteristics, and power control parts utilizing them.A silicon nitride substrate comprises a silicon nitride sintered body obtainable by sintering a silicon nitride powder in the presence of a sintering aid comprising MgO, Y2O3 and SiO2 in a proportion of (1) MgO / (MgO+SiO2)=34-59 mol %, and (2) Y2O3 / (Y2O3+SiO2)=50-66 mol %, and a silicon nitride circuit board utilizes it.

An insulated wire which comprises an aluminum conductor, having: an adhesion layer formed by directly baking, on the aluminum conductor, varnish containing a carboxy group; an insulation layer as an outer layer of the adhesion layer; and a reinforcement insulation layer as an outer layer of the insulation layer; and a method of producing the same.

The present invention relates to an insulated electric wire having partial discharge resistance and a partial discharge inception voltage. Specifically, the present invention relates to an insulated electric wire having partial discharge resistance, which not only has excellent partial discharge resistance, The voltage is high, and the adhesion between the conductor and the insulating layer, the flexibility of the insulating layer, etc. are also excellent, and the manufacturing process is simple and the manufacturing cost is low.