JPS6012255Y2 - three phase wound core - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a three-phase wound core in an Evans type three-phase wound core structure that prevents compressive force from being applied to the internal core and reduces noise.

FIG. 1 is a configuration diagram of a conventional three-phase wound core.

1.2 are two inner cores made of wound magnetic strips and assembled next to each other.

3 is made by winding magnetic strips in the same way as internal cores 1 and 2,
It is also an outer core that surrounds the inner cores 1 and 2.

A three-phase wound core 4 is made by combining the inner cores 1 and 2 and the outer core 3.

In FIG. 1, inner cores 1 and 2 and outer core 3 are formed in close contact with each other.

In this structure, if the inner cores 1 and 2 are not deformed and the outer core 3 is formed to match the outer shape of the inner cores 1 and 2, no force is applied from the outside to the inner cores 1 and 2. Therefore, there will be no negative impact on noise.

However, in manufacturing, the inner cores 1 and 2 are almost always shaped, so it is extremely difficult to make the outer core 3 match the outer shape of the inner cores 1 and 2.

Therefore, in the case where the outer core 3 is formed so as to be in close contact with the inner cores 1 and 2, the inner cores 1 and 2 are marked with the arrows X shown in FIG.
A directional force (compressive force) will be applied.

On the other hand, grain-oriented silicon steel plates are generally used for the magnetic strips constituting the iron core, and their magnetostrictive properties deteriorate significantly when compressive force is applied.

Magnetostriction is the source of noise, and compressive force significantly worsens magnetostriction, thereby increasing noise.

In this way, when the outer core 3 is formed in close contact with the inner cores 1 and 2 as in the past, compressive force is applied to the inner cores 1 and 2 during assembly, which affects the magnetostrictive properties of the silicon steel plate that is the core material. This has the disadvantage of making the noise worse.

The purpose of the present invention is to provide a three-phase wound core that eliminates compressive force on the internal core and reduces noise.

This invention places a corrugated elastic material between the inner core and the outer core, and when the outer core is assembled, the compressive force to the inner core is absorbed by the full-gate elastic material and compressed to the inner core. The purpose is to prevent the application of force and reduce noise.

The present invention will be described below with reference to an embodiment shown in FIGS. 2 to 4.

In FIG. 2, 5 and 6 are internal cores, and 7 is an external core.

8 is a corrugated elastic material disposed between the inner core 5.6 and the outer core 7.

Reference numeral 9 designates a three-phase wound core in which internal cores 5 and 6 are assembled with an external core 7 via a corrugated elastic material 8.

In FIG. 3, at least a part of the outermost periphery of the internal core 10 is made into a corrugated shape 11, and this is used as a corrugated elastic material disposed between the internal core and the external core.

In FIG. 4, at least a part of the innermost circumference of the outer core 12 is made into a corrugated shape 13, and this is used as a corrugated elastic material disposed between the inner core and the outer core.

In this invention, a corrugated elastic material is placed between the inner core and the outer core, so that after the outer core is assembled, no force is applied to the inner core than the outer core.

Generally grain-oriented silicon steel plates are used for the magnetic strips that make up each core, but although grain-oriented silicon steel plates have good magnetostrictive properties against tensile force, they deteriorate significantly when compressive force is applied. are doing.

Magnetostriction is the source of noise, and if the magnetostriction characteristics deteriorate, the noise will naturally increase.

Therefore, if the three-phase wound core is configured as in the present invention, the compressive force is absorbed by the corrugated elastic material, so the compressive force from the external core is not applied to the internal core, and the magnetostrictive properties of the silicon steel sheet are also deteriorated. There is no increase in noise.

In addition, since the three cores of the three-phase wound core are independent from each other, even if a gap is provided with a corrugated elastic material, its magnetic properties are hardly affected.

As described above, according to the present invention, in a three-phase wound core, a corrugated elastic material is arranged between the internal core and the external core to prevent compressive force from the external core from being applied to the internal core. , it is possible to prevent deterioration of magnetostrictive properties, thereby preventing an increase in noise.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a three-phase winding core according to the conventional method, Figure 2 is a configuration diagram of a three-phase winding core according to the present invention, and Figures 3 and 4 are configuration diagrams showing other embodiments of the present invention. It is. 1, 2, 5, and 6 are internal cores, 3 and 7 are external cores, and 8 is a corrugated elastic material.

Claims (3)

[Scope of utility model registration request] (1) In a three-phase wound core consisting of at least two adjacent inner cores wound from magnetic strips and an outer core surrounding them, a corrugated elastic body is arranged between the inner core and the outer core. A three-phase wound core that is characterized by: (2) The three-phase wound core according to claim 1, wherein the corrugated elastic body has at least a part of the outermost periphery of the internal core corrugated. (3) The three-phase wound core according to claim 1, wherein the corrugated elastic body has at least a part of the innermost periphery of the outer core corrugated.