JP2000124044A - Low-noise transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain increase in cost to a minimum due to increase in the number of manufacturing processes and components, and reduce noise by covering a whole iron core with sound-absorbing material, and arranging the sound-absorbing material and vibration isolating material at contact part positions of the iron core and members constituting a transformer. SOLUTION: This low-noise transformer is constituted of an iron core 1, a coil 2, an upper binding metal fixture 5, a lower binding metal fixture 6, and a coil retainer 7. The whole iron core 1 is covered with a sound absorbing material 3, and noise generated from the iron core 1 is absorbed. In a process for covering the core with the sound absorbing material 3, sticking of glass wool, spreading of a foamed sound- absorbing material, etc., are performed. Vibration isolating material 4, constituted of vibration isolating rubber sheets or the like, is arranged at contact part positions of members constituting the transformer, except the iron core 1 members of which are the coil 2, the upper and the lower binding metal fixtures 5, 6, etc., with the iron core 1, and propagation of vibration is prevented. By making the tronsforme such a simple structure, the increase in cost due to the increase in the number of manufacturing processes and components is restrained to a minimum, and noise generated from the transformer is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-noise transformer, and more particularly, to a low-noise transformer having an iron core using a magnetic material, a coil wound around a leg of the iron core, etc., to reduce noise due to excitation vibration. Related to low noise transformers.

[0002]

2. Description of the Related Art A transformer is a device for converting high-voltage / small-current AC power into low-voltage / high-current AC power and vice versa. And a constituent coil. A conventional transformer has an iron core, a coil, an upper clamp, a lower clamp, a coil support, and the like. An amorphous magnetic material other than a silicon steel plate is used as a material for the iron core.

[0003] The noise of the transformer is mainly caused by the excitation vibration of the iron core, and the magnitude of the noise value is approximately the capacity of the transformer,
Determined by iron core material, structure and magnetic flux density. Therefore, as a conventional technique, in order to reduce the noise of the transformer, processing to reduce the magnetic flux density of the iron core, providing a spacer around the iron core, installing a sound insulating plate inside or outside the transformer case, (Japanese Unexamined Patent Publication No. Hei 2-288316), and a method of providing a member having an anti-seismic performance at a fixed portion between the transformer and the tank (Japanese Unexamined Patent Publication No. Hei 7-212554). However, if methods such as lowering the magnetic flux density, providing spacers, installing sound insulation plates in transformer tanks, or providing seismic isolation members, the number of transformer manufacturing processes and parts will increase, resulting in a significant increase in cost. Had the problem of causing

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the problems of the prior art and, by adopting a simple structure, minimizes the cost increase due to an increase in the number of manufacturing steps and parts. It is to provide a transformer that reduces noise.

[0005]

According to the present invention, there is provided a low-noise transformer including a core, a coil, and the like using a magnetic material, wherein the iron core is entirely covered with a sound absorbing material.

Further, the present invention is a low-noise transformer in which a sound absorbing material and an anti-vibration material are provided at a contact portion between the iron core and a member constituting a transformer.

According to the present invention, the magnetic material used for the iron core is an amorphous alloy ribbon, and the iron core comprises:
This is a low-noise transformer that is entirely covered with a sound absorbing material and an insulating member for preventing amorphous debris from scattering.

Further, the present invention is a low-noise transformer in which the above-mentioned iron core is entirely covered with a sound absorbing material and an insulating member for preventing amorphous fragments from scattering.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described. Hereinafter, embodiments of the low-noise transformer of the present invention,
This will be described with reference to FIGS. FIG. 1 is a perspective explanatory view of the internal structure of the low-noise transformer according to the first embodiment. FIG. 2 is an A-section explanatory view of the internal structure of the low-noise transformer according to the first embodiment.
FIG. 3 is an explanatory B sectional view of the internal structure of the low noise transformer according to the first embodiment. FIG. 4 is a perspective explanatory view of the core structure of the low-noise transformer according to the second embodiment. FIG. 5 is an explanatory C sectional view of the core structure of the low-noise transformer according to the second embodiment.

Embodiment 1 will be described. As shown in FIGS. 1 to 3, the low-noise transformer of this embodiment has an iron core 1, a coil 2,
It has a sound absorbing material 3, a vibration isolator 4, an upper fitting 5, a lower fitting 6, a coil support 7, and the like. The iron core 1, the coil 2, the upper fastener 5, the lower fastener 6, the coil support 7, and the like are the same as in the conventional example. The low-noise transformer according to the present embodiment includes a sound absorbing material 3 and a vibration isolating material 4.
It has. The sound absorbing material 3 covers the entire iron core 1 by, for example, pasting glass wool or applying a foaming sound absorbing material. The anti-vibration material 4 is made of, for example, an anti-vibration rubber sheet,
The coil 2, which is a member constituting a transformer other than the iron core, the upper and lower fasteners 5, 6, and the like are provided at contact portions with the iron core 1. The sound absorbing material 3 covering the entire core 1 can absorb noise generated from the core 1. In addition, the vibration-proof material 4 can prevent propagation of vibration. Thereby, the low-noise transformer of the present embodiment can reduce the noise generated from the transformer.

Embodiment 2 will be described. The iron core of the low-noise transformer of the present embodiment is different from that of the low-noise transformer of the first embodiment in that:
An amorphous alloy ribbon is used as a core material. As shown in FIGS. 4 and 5, the iron core 1b is entirely composed of a sound absorbing material 3b and an insulating member 8 for preventing amorphous fragments from scattering.
b. The amorphous alloy ribbon used for the core material of the transformer is brittle, and the amorphous alloy fragments are generated by cracking and chipping, causing dielectric breakdown inside the transformer. Iron core 1b
Is protected by the insulating member 8b, so that the noise generated from the transformer can be reduced and the fragments can be prevented from scattering outside the iron core.

Although the above-described embodiment is an example of a single-phase wound core, other three-phase wound cores, single-phase stacked cores, and three-phase stacked cores may also be made of a sound absorbing material. And noise reduction can be achieved by providing an anti-vibration material at a contact portion with another member such as a coil or a fastener.

[0013]

As described above, according to the present invention, it is possible to obtain a transformer which has a simple structure, minimizes the cost increase due to an increase in the number of manufacturing processes and the number of parts, and reduces noise. Can be.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of the internal structure of a low-noise transformer according to a first embodiment.

FIG. 2 is an A-sectional explanatory view of the internal structure of the low-noise transformer according to the first embodiment.

FIG. 3 is an explanatory B sectional view of the internal structure of the low noise transformer according to the first embodiment;

FIG. 4 is an explanatory perspective view of an iron core structure of a low-noise transformer according to a second embodiment.

FIG. 5 is an explanatory C sectional view of an iron core structure of a low noise transformer according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1b Iron core 2 Coil 3, 3b Sound absorbing material 4 Earthquake-proof material 5 Upper clamp 6 Lower clamp 7 Coil support 8b Iron core protection member

Continued on front page (72) Inventor Toshiki Shirata Hata 46-1, Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Industrial Machinery Division, Hitachi, Ltd. F-term in Industrial Machinery Division, Hitachi, Ltd. (reference) 5E058 AA12 AA23 AA25

Claims (4)

[Claims] 1. A low-noise transformer comprising a core, a coil, and the like using a magnetic material, wherein the core is entirely covered with a sound absorbing material. 2. The low-noise transformer according to claim 1, wherein a sound absorbing material and an anti-vibration material are provided at a contact portion between the iron core and a member constituting the transformer. 3. The low-noise transformer according to claim 1, wherein the magnetic material used for the iron core is an amorphous alloy ribbon, and the iron core is entirely used as a sound absorbing material and for preventing the scattering of amorphous fragments. A low noise transformer characterized by being covered with an insulating member. 4. The low-noise transformer according to claim 3, wherein the core is entirely covered with a sound absorbing material and an insulating member for preventing amorphous debris from scattering.