JPS61269808A - Lubricating enamelled wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] and industrial application fields. The present invention relates to a lubricious enamelled wire.

More specifically, the present invention relates to a lubricating enamelled wire with excellent coil windability.

[Prior Art] The productivity of motors and transformers is greatly influenced by the coil winding speed.

When the coil winding speed is increased, the enamelled wire is fed into the winding machine at high speed and under high tension. Therefore, the enamelled wire used for high-speed winding is required to have slipperiness so that it can be smoothly fed into the winding machine.

The slipperiness of enameled wire can be determined by two methods: applying and baking a lubricating film on the outermost layer of the enameled wire, and simply applying lubricating oil. The enamelled wire of the former method is called a self-lubricating enameled wire. This self-lubricating enameled wire has the disadvantage that the outer diameter of the enameled wire becomes thicker by the amount of the lubricating layer provided, and as a result, the size of the resulting coil becomes larger. In other words, coils using self-lubricating enamelled wires hinder the miniaturization and weight reduction of motors and transformers.

On the other hand, enameled wire coated with lubricating oil has a disadvantage in that it has inferior slipperiness compared to self-lubricating enameled wire.

[Problems to be Solved by the Invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art and to provide a lubricant-applied type with excellent slipperiness. Our purpose is to provide a lubricated enamelled wire.

[Means for Solving the Problems] The gist of the present invention is to add 0.1 parts of natural wax to 1001 parts of lubricating oil, which is liquid at room temperature, on the outer periphery of an enameled wire.
A lubricating enameled wire characterized in that it is coated with a natural wax blend lubricating oil obtained by blending 1 to 5 parts by weight.

In the present invention, any oil, including mineral oil and vegetable oil, which is liquid at room temperature can be used, but mineral oil, particularly liquid paraffin and trans oil, is preferable from the viewpoint of storage stability and handling.

In addition, natural waxes include beeswax, carnauba wax,
Lanolin (wool fat) etc. can be applied.

In the present invention, the mixing ratio of lubricating oil and natural wax is limited because if the natural wax is less than 0.1 parts by weight, the effect of reducing the coefficient of static friction is small, and if it is more than 5 parts by weight, the mixing ratio of the lubricating oil and natural wax is limited. This is because the stability as a lubricating oil mixture is poor, making it difficult to apply at room temperature.

In addition, the amount of film adhesion of the mixture was 0.0001 to 0.001.
The reason for limiting it to 9/cffl is 0.0001g/ci
Below 00001g/c, the effect of improving slipperiness is small.
I? This is because the adhesive strength of the varnish during varnish treatment decreases rapidly if the temperature exceeds .

[Function] The effect of the lubricating enameled wire of the present invention is that in addition to the lubricating effect of the lubricating oil that is liquid at room temperature, the blended natural wax synergistically enhances the lubricity.

That is, the natural wax mixed into the lubricating oil, which is liquid at room temperature, not only has its own lubricating properties, but also acts to roll and slide in the lubricating oil.

[Examples] Next, Examples and Comparative Examples of the lubricating enamelled wire of the present invention will be described with reference to Table 1.

By the way, the enamelled wire used in Table 1 has a conductor diameter of 1°O.
It is a polyester enameled wire with mtnφ and a coating thickness of 0.038 m. The amount of lubricant applied is determined by weighing the enameled wire before and after applying the lubricant using a chemical balance, and subtracting the difference in weight by the surface area. The static friction coefficient is the static friction coefficient between enameled wires measured by the Howell method. Adhesion with varnish was determined by using an enameled wire as a J15-C-3003 twin-twist sample, immersing it in unsaturated polyester varnish, drying it at 120'C for 1 hour, and then pulling the two twisted pairs in opposite directions. , Center load is 2Kg or more ○
2 kg or less is marked Δ.

As is clear from Table 1, the lubricating enameled wire of the present invention has a small static friction coefficient, that is, it has good slipperiness and also has good adhesion to varnish. On the other hand, the enameled wires of the comparative examples either have a large static friction coefficient, have poor varnish adhesion, or have poor workability in painting the enameled wires.

[Effects of the Invention] The lubricating enameled wire of the present invention does not thicken the enameled wire unlike conventional self-lubricating enameled wires, so the coil can be made smaller and lighter, and has good sliding properties, resulting in excellent It is capable of exhibiting high-speed coil winding properties and is industrially useful.

Claims (2)

[Claims] (1) Apply 100% lubricating oil, which is liquid at room temperature, to the outer circumference of the enameled wire.
A lubricating enameled wire characterized in that it is coated with a natural wax blend lubricating oil obtained by blending 0.1 to 5 parts by weight of natural wax. (2) Application amount of natural wax blend lubricating oil is 0.00
01 to 0.001 g/cm^2. The lubricious enameled wire according to claim 1.