JP3526958B2 - Outer core three-phase AC reactor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer core type three-phase AC reactor in which reactors for respective phases are arranged in an axial direction of a winding and integrated.

[0002]

2. Description of the Related Art FIG. 3 is a front view of a conventional example, and FIG. 4 is A of FIG.
FIG. In the figure, a winding 1 having a terminal 1a
The three phases of the one-phase reactor 3 in which the plurality of iron cores 2 are arranged are arranged in the axial direction of the winding 1 and integrated with each other outside the respective parts. In the figure, there are four iron cores 2 per one winding 1, but there may be ten or more. Although not shown, the iron cores 2 are divided and arranged on the outer circumference of the winding 1 and joined by a conventional technique.

In order to integrate the reactors 3 for the three phases, the reactors 3 for the three phases are stacked to form the iron core 2 between the phases.
Abut. Then, pressing plates 31 are provided at both ends of the reactor 3 for three phases, and the iron core 2 is tightened from both ends by the studs 32 and nuts 33 inside and outside the winding 1. For example,
When there are 10 iron cores 2 per winding 1, iron core 2
Since it is desired to make the tightening force even between the phases, the studs 32 inside and outside the winding 1 may exceed 20. A hole is formed in the central portion of both holding plates 31 to form a vertical air passage 31a for cooling by outside air by thermal convection, but this is not essential because the axis of the reactor 3 may be horizontal.

[0004]

In the above-mentioned conventional example, since the iron cores 2 of the respective phases come into direct contact with each other and are pressed by the studs 32, the iron cores 2 of the respective phases are contacted with each other when energized. At the contact surface, the vibration caused by the magnetostriction of the iron core interferes,
The noise is high. The inner and outer surfaces of the iron core 2 with respect to the inner and outer radial directions of the axial center of the reactor 3 are exposed to the outside air to be cooled, but the end surfaces, which are the contact surfaces of the iron core 2 of each phase, are not exposed to the outside air. Not be cooled. When the number of studs 32 is small relative to the number of iron cores 2, the iron cores 2 are not evenly tightened and noise is likely to increase. When the number of the studs 32 surrounding the iron core 2 is large, the ventilation is deteriorated and the cooling of the surface of the iron core 2 that is in contact with the outside air in the inward and outward directions of the reactor shaft center is hindered. Therefore, the size and weight are increased in order to widen the heat radiation area in order to keep the temperature rise between the winding 1 and the iron core 2 at the reference value.

An object of the present invention is to prevent noise due to magnetostrictive vibrations on the end faces of the iron cores between the phases, and preferably to cool the end faces of the iron cores to reduce the size and weight of the outer core type three-phase AC reactor. To provide.

[0006]

The outer iron core type three-phase alternating current reactor according to the first aspect of the present invention has three phases of the one-phase reactor in which a plurality of iron cores are arranged outside each part of the winding, in the axial direction of the winding. In the outer core type three-phase AC reactor arranged in the above, one end surface of the plurality of iron cores of each phase is fixed to the substrate, and a rod-shaped spacer higher than the iron core is interposed between the substrates between the phases to face the substrate. A space is provided so as not to contact the other end surface of the iron core of the other phase, and the substrate and the spacer are fixed and integrated.

A second aspect of the present invention is the same as the first aspect of the present invention, in which one end faces of the plurality of iron cores of each phase are fixed to the substrate by welding.
A third aspect of the present invention is the same as the first or second aspects, wherein the substrate and the spacer are fixed by welding. A fourth aspect of the present invention is the invention of the first, second or third aspect, in which the gap between the substrate and the other end surface of the iron core of the other phase facing the substrate is formed as a lateral air flow passage for cooling.

[0008]

According to the first aspect of the present invention, since a gap is provided so that the substrate and the other end face of the iron core of the other phase facing the substrate are not in contact with each other through the spacer, noise due to magnetostrictive vibration at the end face of the iron core of each phase is provided. Is prevented. Since one end surface of multiple iron cores of each phase is fixed to the substrate, the rigidity of the substrate can be increased, the spacers in the reactor core axial direction can be eliminated, and the number of spacers outside the axial center can be reduced. it can. Since the number of spacers surrounding the iron core is reduced, ventilation with the outside air is improved and cooling is improved. Even if the gap between the substrate and the other end face of the iron core of the other phase facing the substrate is so small that the gap does not come into contact, cooling occurs at the other end face of the iron core.

According to the second aspect of the present invention, the one end surfaces of the plurality of iron cores and the substrate are fixed to each other by welding, so that the rigidity of the fixing is further improved and the number of spacers can be reduced. According to the third aspect of the invention, since the substrate and the spacers are fixed to each other by welding, the rigidity of the fixing is further improved and the number of spacers can be reduced. According to invention 4,
Since the gap between the substrate and the other end surface of the iron core of the other phase facing the substrate is widened so as to form a lateral airflow passage for cooling, positive cooling by convection of the outside air is promoted.

[0010]

1 is a front view of the embodiment, and FIG. 2 is a plan view of FIG. In the conventional example and in each drawing, those denoted by the same reference numerals have approximately the same function and may not be described. In the figure, three phases of a one-phase reactor 3 in which a plurality of iron cores 2 are arranged are arranged in the axial direction of the winding 1 and integrated outside each part of the winding 1 having a terminal 1a. In the figure, there are four iron cores 2 per one winding 1, but there may be ten or more. Although not shown, each iron core 2 is formed by using a conventional technique.
The divided pieces are arranged and joined to the outer circumference of the winding 1.

In order to integrate the reactors 3 for three phases, one end faces of the plurality of iron cores 2 of each phase are welded and fixed to the substrate 11. A rod-shaped spacer 12 higher than the iron core 2 is interposed between the substrates 11 between the phases, and the substrate 11 and the spacer 12 are fixed by welding. A gap is provided so that the substrate 11 and the other end surface of the iron core 2 of the other phase facing the substrate 11 do not come into contact with each other, and this gap is formed as a lateral air flow passage 13 for cooling. A hole is formed in the central portion of all the substrates 11 to form a vertical airflow passage 11a.
It is similar to the conventional example in that the cooling air is formed by the heat convection of the outside air, but it is not essential because the axis of the reactor 3 may be horizontal.

The substrate 11 and the spacer 12 may be ordinary structural steel, copper alloy, or synthetic resin if the rigidity is sufficient, or a part of the iron core 2 may be molded in the synthetic resin. Instead of fixing one end surface of the plurality of iron cores 2 of each phase and the substrate 11 by welding, a collar is arranged between the other end surface of the iron core 2 and the substrate 11 and penetrates all the substrates and the collar. It may be fixed with a stud or the like. Instead of welding and fixing the substrate 11 and the spacer 12, the substrate 11 and the spacer 12 may be fixed with screws or the like.

According to this embodiment, since the spacer 12 is interposed and a gap is provided so that the substrate 11 and the other end face of the iron core 2 of the other phase facing the substrate 11 do not come into contact with each other, the end face of the iron core 2 of each phase is provided. The noise due to the magnetostrictive vibration is prevented. Since one end surfaces of the plurality of iron cores 2 of each phase are fixed to the substrate 11, the rigidity of the substrate 11 can be increased, the spacer 12 in the reactor core inward direction of the iron core 2 can be eliminated, and the core 12 in the outer axial direction can be eliminated. The number of spacers 12 can also be reduced. Since the number of spacers 12 surrounding the iron core 2 is reduced, ventilation with the outside air is improved and cooling is improved. Even if the gap between the substrate 11 and the other end face of the iron core 2 of the other phase facing the substrate 11 is so small as not to contact with each other, the other end face of the iron core 2 is cooled. If the one end surfaces of the plurality of iron cores 2 and the substrate 11 are fixed to each other by welding, the rigidity of the fixing is further improved and the number of spacers 12 can be reduced.
If the substrate 11 and the spacers 12 are fixed to each other by welding, the rigidity of the fixing is further improved and the number of the spacers 12 can be reduced.
If the gap between the substrate 11 and the other end surface of the iron core 2 of the other phase facing the substrate 11 is widened so as to form a lateral air flow passage for cooling, positive cooling by convection of the outside air is promoted. .

[0014]

According to the outer core type three-phase AC reactor of the first aspect of the invention, noise is generated by magnetostrictive vibration at the end faces of the iron cores between the phases by interposing the spacer between the rigid substrates to which the iron cores are fixed. Since the number of spacers is reduced, ventilation with the outside air is improved, cooling is improved, and the outer core type three-phase AC reactor is generally reduced in size and weight.

According to the second aspect of the invention, since the iron core and the substrate are welded, there is an effect that the rigidity of fixation is further improved, the number of spacers is reduced, and cooling is improved. According to the third aspect of the invention, since the substrate and the spacer are welded, there is an effect that rigidity of fixation is further improved, the number of spacers is reduced, and cooling is improved. According to the fourth aspect of the invention, since the lateral airflow passage is formed between the substrate and the iron core of the other phase, there is an effect that positive cooling is promoted by convection of the outside air and cooling is improved.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view of a conventional example.

FIG. 4 is a view on arrow AA of FIG.

[Explanation of symbols]

1 Winding 1a Terminal 2 Iron Core 3 Reactor 11 Board 11a Vertical Air Flow Passage 12 Spacer 13 Horizontal Air Flow Passage 31 Holding Plate 31a Vertical Air Flow Passage 32 Stud 33 Nut

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-181135 (JP, A) Actual development Sho 58-106929 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 27/24-38/42

Claims (4)

(57) [Claims] 1. An outer core type three-phase AC reactor in which three phases of a one-phase reactor in which a plurality of iron cores are arranged outside each part of a winding are arranged in the axial direction of the winding, One end face of the iron core is fixed to the substrate, and a rod-shaped spacer higher than the iron core is interposed between the substrates between the phases, so that a gap larger than that between the substrate and the other end face of the iron core of the other phase facing this is not provided. An outer core type three-phase AC reactor characterized in that it is provided and the substrate and the spacer are fixed and integrated. 2. The outer core type three-phase AC reactor according to claim 1, wherein one end faces of a plurality of cores of each phase are fixed to the substrate by welding. 3. The outer iron core type three-phase AC reactor according to claim 1 or 2, wherein the substrate and the spacer are fixed to each other by welding. 4. The outer iron core type three-phase AC reactor according to claim 1, 2 or 3, wherein a lateral air flow passage for cooling a gap between the substrate and the other end surface of the iron core of the other phase facing the substrate. An outer core type three-phase AC reactor characterized by being formed as.