JPH0238418Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a reactor device with a relatively large capacity, for example, for electric power, which can reduce vibration and noise that tend to be problematic due to its characteristics, and can be manufactured at low cost. It is.

[Conventional technology]

Conventionally, there have been devices of this type as shown in FIGS. 3 and 4. In the figure, reference numeral 1 denotes a magnetic circuit section (hereinafter referred to as a gapped core) composed of alternating magnetic bodies 2 and non-magnetic bodies 3, which together with a yoke section 4 constitutes the main magnetic circuit of the reactor. There is. 5 is a winding wound around the gapped core 1, and 6 is a tightening bolt for tightening and fixing the gapped core 1.

In the conventional reactor device configured as described above, the magnetic body 2 is usually formed by laminating silicon steel plates in a direction perpendicular to the direction of passing magnetic flux (indicated by φ in the figure). As a known method, a method of forming the core using an involute core or a radial core is also adopted.

Further, the non-magnetic material 3 is provided to obtain the required reactance, and is made of an epoxy resin laminate, ceramic, or the like. This non-magnetic material 3 functions as a spacer that holds the magnetic material 2 at a predetermined interval to ensure a required non-magnetic material portion.

Now, when an alternating current voltage is applied to the winding 5 of this reactor device, an alternating magnetic flux is generated in the gapped core 1 portion, and a magnetic attraction force given by the following equation acts between the magnetic bodies 2.

f=B ² /2μ ₀ [N/m ² ] −(1) where f: Magnetic attraction force per unit area that acts between the magnetic materials 2 [N/m ² ] μ ₀ : Magnetic permeability of the non-magnetic material 3 [H/m] B: Magnetic flux density in the first part of the gap core [Wb/m ² ] By the way, the magnetic flux density B is an alternating magnetic flux with the same frequency as the applied voltage, and its maximum value is Bm [Wb/m ² ]
Then, it is expressed as B=Bmsinωt [Wb/m ² ] −(2). Then, by substituting equation (2) into equation (1), f=B ² m/4μ ₀ −B ² m/4μ ₀ cos2ωt [N/m ² ] −(3) That is, as is clear from equation (3) The magnetic attraction force f is the formula
It has a DC component shown in the first term on the right side of (3) and a single chord vibration component with a frequency twice the applied voltage shown in the second term. Therefore, in addition to the compressive elastic strain caused by the direct current component, dynamic displacement (vibration) will occur in the gapped core 1 part due to the vibration component.
Usually, in a reactor, an important issue is how to suppress the dynamic displacement caused by this vibration component to a low level. Next, the point of suppressing this vibration to a low level will be explained.

The general equation of motion when a force corresponding to the vibration represented by the second term on the right side of Equation 3 acts on the gapped core 1 is expressed by the following equation.

Fmcosωat=KX+Rdx/dt+Md ² x/dt ² [N] −(4) where Fm: Maximum value of magnetic attraction force vibration acting on 1 part of gapped core = B ² mS/4μ ₀ [N] S: Maximum value of vibration of magnetic attraction force acting on 1 part of gapped core Cross-sectional area [m ² ] ωa=2ω [rad/sec] This is a proportional component, typified by frictional force, but generally this value is not very large, so if you ignore this and solve equation (4), you can express it as the following equation.

Fm=｜K−ωa ² M｜Xm[N] −(5) where K: Spring constant of gapped core 1 part [N/m] ωaM: Mechanical impedance of gapped core 1 part [N/m] M: Gapped core 1 part Equivalent ^mass [Kg] taking into account the motion of In addition, the absolute value of the spring constant K should be a large value, or K≪ω ² aM and the absolute value of the mechanical impedance ω ² aM should be a large value. However, in order to bring the vibration and noise to a level where they do not become a problem, it is desirable to suppress the amplitude Xm to 10 ^-5 [m] or less, that is, to the level of several microns, whereas it is desirable to suppress the amplitude Xm to a level of several microns. The magnetic attraction force Fm
is about 5×10 ⁴ [N], so if we try to suppress the amplitude Xm with mechanical impedance ω ² aM, then ωa becomes 200π (rad/sec) or 240π
(rad/sec), so even if the spring constant K is ignored, the mass M needs to be about 10 [tons] or more, and the spring constant K is in order to make one part of the gapped core capable of withstanding the direct current component of the magnetic attraction force. cannot be made too small, so the mechanical impedance ω ² aM
It has become uneconomical and difficult to control vibrations by Therefore, the practical solution for vibration suppression is how large the spring constant K can be obtained.

[Problem that the invention attempts to solve]

Looking at the above conventional device from the above point of view, in order to increase the spring constant K, it is sufficient to select a thick tightening bolt 6 made of a material with a large Young's modulus and tighten it as firmly as possible. The material with a large value is, for example, a metal material such as stainless steel, and on the other hand, metal materials are generally conductive, so under the high magnetic field of the gapped core part, overheating due to excessive eddy current loss is a problem. Therefore, a tightening bolt 6 that is too thick cannot be used.
In addition, since there is a break between the magnetic material 2 and the non-magnetic material 3 and there is no continuity, the stiffness of the gapped core 1 cannot be said to be homogeneous, which may cause backlash during operation. However, it has the disadvantage that it is difficult to obtain a material with high rigidity.

This invention was made to eliminate the above-mentioned drawbacks of the conventional reactor, and its purpose is to provide an economical reactor device that reduces vibration and noise.

[Means for solving problems]

The reactor device according to this invention includes a layered core having a first air in a part of the magnetic path, and both ends of the layered core are sandwiched and fixed between the layered cores, and a predetermined gap is maintained in the layering direction of the layered core. a support plate made of a plurality of non-magnetic materials connected between the first air sources via a support plate; and a support plate made of a plurality of non-magnetic materials that is connected to each other between the first air sources via a second air source that is layered in the same direction as the layered iron core and in the magnetic path direction. The laminated iron core piece is integrally fixed to each of the support plates by a tightening bolt inserted therebetween and penetrating in the lamination direction.

[Effect]

In this invention, the magnetic attraction force acting on the layered core piece is transmitted to the support plate that is integrally formed with the layered core piece and the tightening bolt, and acts as a distributed load on the support plate itself.

〔Example〕

Hereinafter, a reactor device according to an embodiment of this invention will be explained with reference to the drawings.

In FIGS. 1 and 2, the yoke portion 4 and the winding 5 are the same as those of the conventional one. 1 ₁ is the first cavity formed in the yoke part 4, 7 is the first cavity formed in the yoke part 4, and 7 is the first cavity formed in the yoke part 4.
A plurality of supporting plates are sandwiched and fixed between the laminated cores constituting the laminated core, and are connected between the first spaces (1) and ( _{11 )} for a predetermined distance in the layering direction of the laminated cores. It is also made of materials with high Young's modulus, such as stainless steel, ceramics, and epoxy resin laminates. 8
is connected to each support plate 7 through the second air 1 ₃ in the magnetic path direction.
The laminated core piece 9 inserted between the laminated core pieces 9 penetrates this laminated iron core piece 8 and each support plate 7 in the stratification direction.
This is a tightening bolt that fixes the support plate 7 and each support plate 7.

According to one embodiment of the invention constructed as described above, a support plate 7 without any break point in the direction of the magnetic path is provided, and a stratified core piece 8 as a magnetic material is fixed to this support plate 7 to generate a magnetic attraction force. Since the laminated core piece 8 is supported in the first space ₁₁ by the support plate 7 which is integrated in the direction, the magnetic attraction force acting on the laminated iron core piece 8 is directly transmitted to the support plate 7 and the support plate This will act as a distributed load on 7 itself. Therefore, this magnetic attraction force is opposed by the internal stress of the support plate 7 itself, and due to its high rigidity, vibration noise is suppressed to a sufficiently low level, and even during long-term operation, there is no backlash due to the magnetic attraction force. The structure is such that it is difficult for this to occur.

Furthermore, in the above embodiment, the support plates 7 are made of non-magnetic material, but even if a conductive metal material is used, for example, the number of the support plates 7 can be increased and the thickness of each support plate 7 can be made thinner. As a result, eddy current loss can be suppressed, and the cross-sectional area of the support plate 7 as a whole can be increased to easily increase the spring constant K, so that effects similar to those of the above-mentioned embodiments can be achieved.

Furthermore, for the convenience of explaining the embodiments above, an example in which one part of the gapped core for one leg was explained, but this invention can also be applied to one part of each gapped core in a single-phase or multi-phase reactor having one part of gapped cores with multiple legs. Needless to say, this applies.

[Effect of idea]

As described above, according to this invention, a layered core having a first air hole in a part of the magnetic path, both ends of which are clamped and fixed to the layered core, and a predetermined gap in the layering direction of the layered core. a support plate made of a plurality of non-magnetic materials connected to the first space via a support plate;
The laminated iron core is laminated in the same direction as the laminated iron core, and is fixed integrally with each of the support plates by a tightening bolt that is inserted between the support plates through a second hole in the direction of the magnetic path and penetrates in the direction of lamination. By providing a layered core piece, it is possible to provide an economical reactor device in which the magnetic attraction force acting on the layered core piece is absorbed by the internal stress of the support plate, vibration and noise are reduced.

[Brief explanation of drawings]

1 and 2 are a front view and a side view showing a reactor device in an embodiment of this invention,
FIG. 3 and FIG. 4 are a side view and a front view showing a conventional reactor device. In the figure, 7 is a support plate, 8 is a layered core piece, 9
is the tightening bolt, 1 ₁ is the first space, 1 ₂ is the space, 1
₃ is the second sky. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a stratified iron core having a first air gap in a part of the magnetic path;
a support plate made of a plurality of non-magnetic materials, both ends of which are sandwiched and fixed between the laminated iron cores and connected to the first space via a predetermined gap in the layering direction of the laminated iron core; The laminated iron core is laminated in the same direction as the laminated iron core, and is fixed integrally with each of the support plates by a tightening bolt that is inserted between the support plates through a second hole in the direction of the magnetic path and penetrates in the direction of lamination. A reactor device characterized by comprising a layered core piece.