JPH04134809A - E-shaped core - Google Patents

Abstract

PURPOSE:To obtain an E-shaped core, in which minute air gaps are formed simply and surely, by roughly surface-working the surface opposite to the central magnetic leg-connecting surface connected to a yoke part. CONSTITUTION:An E-shaped core 21 is worked by a grinder device 41: the surface on this side of a central magnetic leg 22 becomes a roughly ground surface 32 by a rough grindstone part 42 and magnetic legs 23, 24 are worked into finely ground surface 33, 34 by fine grindstone parts 43, 44. The E-shaped core 21 is combined with the E-shaped core 31 of a shape axisymmetric with respect to the core 21 so that a transformer 30 is constituted. A roughly ground part 39 is formed between the roughly ground surface 32 of the E-shaped core 21 and the roughly ground surface of the other E-shaped core 21 opposite to the surface 32 and becomes equivalent to a minute air gap so that it is possible to regulate magnetic properties of the transformer 30.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an E-type core made of a magnetic material used for magnetic cores of transformers, choke coils, noise filters, etc. This invention relates to an E-shaped core provided with a gap for adjusting the magnetic characteristics of a core transformer or the like.

(Prior Art) Transformers, choke coils, noise filters, and the like, which are components of electronic devices, use magnetism as an energy medium, and therefore a core made of a magnetic material is generally used as the magnetic core.

The core forms a magnetic path that mediates the magnetism, and the magnetic permeability of the core affects the magnetic characteristics of the transformer and the like.

Further, the magnetic characteristics of the transformer and the like are adjusted by taking into consideration the magnetic permeability of the core and the like, and also by providing an arbitrary gap in the magnetic path.

In particular, a transformer or the like is constructed by using an E-shaped core having an E-shaped core, and combining the E-shaped cores in contact with each other, and applying a thickness of, for example, several μm to several tens of μm to the corresponding joint portion. The magnetic characteristics of the transformer etc. are finely adjusted by providing a very thin micro-gap.

As mentioned above, a conventional example of an E-type core in which a very thin micro-gap is provided by being incorporated into a transformer or the like will be explained with reference to FIG.

In FIG. 7, an E-type core 1 made of a magnetic material such as ferrite is connected to a first side magnetic core 1 on both sides of a central magnetic leg 2 having a substantially square cross section through a first groove 6 and a second groove 7, respectively. The legs 3 and the second side magnetic legs 4 are arranged, and the central magnetic legs 2
, one end of each of the first side magnetic leg 3 and the second side magnetic leg 4 is connected by a yoke portion 5.

At this time, generally in view of the magnetic characteristics of the E-type core 1, the cross-sectional area of the central magnetic leg 2 is equal to the sum of the cross-sectional areas of the first side magnetic leg 3 and the second side magnetic leg 4. It is formed to be.

The E-type core I is formed by press-molding a powdered magnetic material using, for example, a single-acting press device (not shown) having a single-acting pressurizing surface.

Therefore, the shape of the E-type core 1 when viewed from the top and bottom is E-shaped, and since the single-acting pressurizing surface of the single-acting brace device is flat, the E-shaped surface is flat. It is formed.

The single-acting press device itself is small and simple, and is suitable for mass production.Furthermore, since the pressurizing surface moves singly, there is no fear of micro-cracks or the like occurring in the molded member.

In general, the E-type core 1 has various uneven parts generated by molding processed by polishing, for example, using a grinder device (not shown), and the first side magnetic leg and second side of the other E-type core are polished. The contact surfaces of each of the first side magnetic leg 3 and the second side magnetic leg 4 of the E-type core 1 that are in contact with the magnetic leg, respectively, are in contact with the first magnetic leg.
They are a polished surface 13 and a second polished surface 14.

Furthermore, due to the grinder device, the opposing surface of the central magnetic leg 2 of the E-type core 1 that faces the central magnetic leg of the other E-type cores is lower than the first polished surface 13 and the second polished surface 14 in the yoke portion.
A finely cut surface 12 is formed by cutting a fine width in the direction.

By combining the E-type core 1 and another E-type core 1) formed in a line-symmetrical shape with the E-type core 1,
The transformer 10 is configured as shown in FIG.

As is clear from FIG. 8, the E-type core 1
When combined with another E-type core 1), the first polished surface 13 and second polished surface 14 of the E-type core 1 are brought into contact with the opposing polished surfaces of the other E-type core 1). At the same time, a micro gap 19 is formed between the micro-cut surface 12 of the E-type core 1 and the opposing micro-cut surface of another E-type core 1).

That is, a microgap 19 having a magnetic permeability different from the magnetic permeability of the core is provided in the magnetic path between the central magnetic legs of the transformer 10 consisting of the E-type core 1 and the other E-type core 1),
The microgaps 19 allow the magnetic characteristics of the transformer 10 to be adjusted.

In addition, in the transformer 10, when combining the E-type core 1 and the other E-type core 1), a coil bobbin 8 (represented by a virtual line) wound with enameled wire etc. is placed between the central magnetic legs. It is constructed by fitting the parts in and fixing them using fixing fittings (not shown) or the like.

There is also an attempt to adjust the magnetic characteristics of the transformer 10 by forming a finely cut surface on one of the E-type core 1 or another E-type core 11 to provide a fine gap.

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional E-type core, the E-type core is formed by press-molding a magnetic material using a single-acting press device or the like, and the center magnetic field of the E-type core is By cutting the legs, microgaps are formed to adjust the magnetic properties of transformers, etc., which are constructed by combining the E-shaped cores, and the microgaps range from several μm to several micrometers. There are cases in which cutting is performed to a very thin layer of 10 μm, which requires high processing precision and has the problem of poor production efficiency.

In addition, when mass producing the E-type core, it is difficult to cut the microgaps, which are used as a means of adjusting the magnetic properties of the transformer, etc., with uniform accuracy. The problem was that precise equipment was required.

The present invention has been made in view of the above circumstances, and it is possible to easily and reliably form a microgap for adjusting the magnetic characteristics of a coil, etc., which is constructed by combining E-shaped cores, etc. This provides an E-type core.

(Means for Solving the Problem) In order to achieve the above object, the present invention includes a central magnetic leg,
An E-shaped core having a pair of side magnetic legs arranged opposite to each other so as to sandwich the central magnetic leg, and a yoke portion that connects one end of the central magnetic leg and one end of each of the pair of side magnetic legs to each other. The above object is achieved by roughening the surface opposite to the side magnetic leg connecting surface connected to the yoke portion and the side opposite the side magnetic leg connecting surface connected to the yoke portion. It is.

(Function) In the present invention, a central magnetic leg, a pair of side magnetic legs arranged opposite to each other so as to sandwich the central magnetic leg, and one end of the central magnetic leg and one end of each of the pair of side magnetic legs are provided. An E-shaped core consisting of yoke portions that are connected to each other is formed so that the surface opposite to the side magnetic leg movement connecting surface connected to the yoke portion is roughened, and the opposite surface of the central magnetic leg connecting surface connected to the yoke portion is roughened. The roughened surface is processed to form a micro-gap that adjusts the magnetic characteristics of a transformer, etc., which is constructed by abutting and combining the E-shaped cores, etc. High processing accuracy is not required.

In addition, when mass producing the E-type core, it is difficult to cut the micro-gaps, which are used as a means of adjusting the magnetic properties of the transformer, etc., with uniform accuracy. Since a roughened surface processing portion is formed and the roughened surface processing portion is made equivalent to the micro-gaps, the roughened surface processing portion can be formed easily and with uniform accuracy.

(Example) Embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a perspective view showing an embodiment of the E-type core according to the present invention, FIG. 2 is a perspective view showing the state of roughening and polishing of the E-type core according to the same embodiment, and FIG. 3 is the same. FIG. 4 is a plan view showing a transformer constructed by combining E-type cores according to an embodiment, and FIG. 5 is a perspective view showing another embodiment of the E-type core according to the present invention. A perspective view showing the state of surface roughening and polishing of the E-type core is shown, and FIG. 6 is a plan view showing a transformer constructed by combining E-type cores according to the same embodiment.

In FIG. 1, an E-type core 21 made of a magnetic material such as ferrite is inserted into a first side magnetic core 21 on both sides of a central magnetic leg 22 having a substantially square cross section through a first groove 26 and a second groove 27, respectively. While the legs 23 and the second side magnetic legs 24 are arranged,
One end of each of the central magnetic leg 22, the first side magnetic leg 23, and the second side magnetic leg 24 is connected by a yoke portion 25.

At this time, generally considering the magnetic characteristics of the E-type core 21,
The cross-sectional area of the central magnetic leg 22 is larger than that of the J-side magnetic leg 23 and the second
It is formed to be equal to the sum of the cross-sectional areas of the side magnetic legs 24.

The E-shaped core 21 is formed by press-molding a powdered magnetic material using, for example, a single-acting press device (not shown) having a manual pressure surface.

Therefore, the shape of the E-shaped core 21 in top and bottom views is E-shaped, and since the single-acting pressurizing surface of the manual press device is flat, the E-shaped surface is flat. It is formed.

The E-shaped core 21 has various uneven portions generated by the molding process polished by a grinder device 41, and this pattern will be explained with reference to FIG. 2.

The grinder device 41 is equipped with a cylindrical grinder 46 supported by a rotating shaft 45, and the cylindrical grinder 46 has a rough grindstone section 42 for rough grinding in the center thereof.
However, a first fine whetstone section 43 and a second fine whetstone section 44 for performing fine polishing are detachably provided on both sides.

The rotation shaft 45 of the grinder device 41 is equipped with a rotation mechanism for rotating the cylindrical grinder 46 in the direction of the arrow 1 in the figure, and a movement mechanism for moving the E-shaped core 21 in the direction of the arrow 2 in the figure. There is.

Therefore, the E-shaped core 21 is ground by the grinder device 41, with the front surface of the central magnetic leg 22 being ground by the rough grinding stone part 42 having a coarse abrasive grain size, and as shown in FIG. In addition, the first (ll1M1 leg 23 and the second side magnetic leg 24) are polished by the first fine grindstone part 43 and the second fine grindstone part 44, which have fine abrasive grain sizes, respectively, so that the first polished surface 33 and the second side magnetic leg 24 are polished. 2 polished surface 34.

As shown in FIG. 3, a transformer 30 is constructed by combining the E-type core 21 and another E-type core 31 formed in a line-symmetrical shape with the E-type core 21.

As is clear from FIG. 3, the E-type core 21
When combined with another E-type core 31, the E-type core 2
The first polished surface 33 and the second polished surface 34 of the E-shaped core 31 are brought into contact with the opposing polished surfaces of the other E-shaped core 31, and the
Another E-type core 1) facing the roughly polished surface 32 of the type core 21
A rough polishing surface 39 is formed between the rough polishing surface and the rough polishing surface.

In other words, the transformer 30 composed of the E-shaped core 2 formed as described above and the other E-shaped core 31 has a magnetic permeability different from the magnetic permeability of the core in the magnetic path between the central magnetic legs. A roughly polished surface 39 having a rough polishing surface 39 is provided, and this coarsely polished surface 39 is equivalent to having a very thin micro-void of several μm to several tens of μm as described in the conventional example. It is now possible to adjust the magnetic properties.

That is, according to the E-shaped core 21, the rough polished surface 32 of the central magnetic leg 22 is in contact with the first polished surface 33 of the first side magnetic leg 23 and the second polished surface 34 of the second side magnetic leg 24. By polishing into a rough surface shape, three rough polishing surfaces are formed on the rough polishing surface 32, and the magnetic characteristics of the transformer 30 can be adjusted. Machining precision is not required, and therefore there is no need to use precise equipment.

Furthermore, a roughly polished surface 32 is provided on the central magnetic leg 22 of the E-shaped core 21, which serves as a means for adjusting the magnetic characteristics of the transformer 30.
Since it is formed using a simple grinder device 41, the rough polished surface 32 can be formed with uniform accuracy when mass producing the E-shaped core 21.

In addition, when the transformer 30 combines the E-type core 21 with another E-type core 31, a coil bobbin 28 (represented by a virtual line) wound with enameled wire or the like is fitted into the central magnetic legs. 2. Also, the grinder device 41
is a rotating shaft 45 on which the cylindrical grinder 46 is supported.
It is configured such that the installation position of the central magnetic leg 22 can be freely changed, thereby allowing the rough polishing surface 32 of the central magnetic leg 22 to be polished to an arbitrary depth.

Furthermore, a roughly polished surface 32, which serves as a means for adjusting the magnetic characteristics of the transformer 30, may be polished on one of the E-type core 21 or the other E-type core 31.

Next, another embodiment according to the present invention will be described.

The E-type core 51 shown in FIG. 4 is manufactured by the following steps.

For example, a pair of side columns and a common column that connects one end of each of the pair of side columns to each other can be formed by press-molding powdered magnetic material using a single-acting press device (not shown). It is molded into a U-shaped molded member.

At this time, since the press surface of the single-acting press device is flat-processed, the U-shaped surfaces in the upper and lower views formed from the pair of side columns and the common column of the U-shaped molded member each have a flat surface. I am doing it.

The U-shaped molded member is polished and cut using a grinder device 71, as shown in FIG.

The grinder device 71 includes a first cutting grinder 76 and a second cutting grinder 76 formed of an abrasive material or the like into a disk shape so as to cut the common column along the inner edges of the pair of side legs.
A cutting grinder 77 is also provided and is further supported by a rotating shaft 75.

Also, the first cutting grinder 76 of the grinder device 71
and a second cutting grinder 77, there is provided a rough grindstone section 72 formed into a cylindrical shape using a coarse-grained abrasive material or the like so as to rough-polish the common column with a diameter smaller than that of the grinder. Further, on the outer side of each of the first cutting grinder 76 and the second cutting grinder 77, a cylindrical shape is formed from fine-grained abrasive material or the like so as to polish the pair of side columns. First fine grinding wheel section 73 and second fine grinding wheel section 7
4, and is similarly supported by the rotating shaft 75.

Further, the rotation shaft 75 of the grinder device 71 has a rotation mechanism that rotates each of the grinders and each grindstone section in the direction of the arrow (■) in the figure, and a movement mechanism that moves the mouth molding member in the direction of the arrow (■) in the figure. It is equipped.

As shown in FIG.
The first side magnetic leg 53 and the second (ill magnetic leg 5
4, and a yoke portion 55 that connects one end of each of the central magnetic leg 52, the first side magnetic leg 53, and the second side magnetic leg 54 to each other.

Further, the rough grinding wheel section 72 of the grinder device 71 forms a rough grinding surface 62 on the front surface of the center Fam 52, and the fine grinding wheel section 73 and the second fine grinding wheel section 74 respectively form the first side magnet. A first polishing surface 63 and a second polishing surface 64 are formed on the front surfaces of the legs 53 and the second side magnetic legs 54 .

As shown in FIG. 6, the E-shaped core 5I has a coil bobbin 58 wound with enameled wire or the like, which is connected to the central magnet ll! 15
The transformer 60 is constructed by being fitted into the E-shaped core 61 and in abutting combination with another E-shaped core 61 having a line-symmetrical shape.

At this time, the E-type core 5 and the other E-type core 61 of the transformer 60 are fixed by a fixing fitting (not shown), but as described above, the roughly polished surface 62 is Since the surface has been polished more roughly than the first polished surface 63 and the second polished surface 64, there is a rough surface on the opposing portion between the roughly polished surface 62 of the E-shaped core 51 and the roughly polished surface of the other E-shaped core 61. Six polished surfaces are formed.

The E-shaped core 51 in this embodiment also provides excellent effects similar to those in the previous embodiment.

Further, the E-type core 51 is manufactured by press-molding a magnetic material using the manual press device to form, for example, a mouth-shaped molded member, and then cutting the material.
A surface polishing process can be combined with the cutting process.

In this embodiment, the E-shaped core 51 was manufactured by molding and cutting the mouth-shaped molded member using a single-acting press machine, but the H-shaped molded member was also manufactured using the single-acting press machine. The front 2E type core 51 can also be manufactured by molding into a mouth-shaped molded member, a day-shaped molded member, etc., and then cutting and cutting the respective molded members.

Furthermore, in this embodiment, the central liR leg 52 is
Although the case where the shape is elongated in the horizontal direction has been described, the shape is not limited to this. For example, the shape may be approximately square, or it may be elongated in the vertical direction, and furthermore, the shape may be approximately elliptical. You can.

Note that when iron powder is used as the magnetic material, a powder magnetic core is formed by pressure molding, and when ferrite powder is used, a binder is added to the ferrite powder and granulated, and then pressure molded. A ferrite core is formed by molding and firing.

In addition, in this example, in order to pressurize the magnetic material,
Although a single-action press device was used, the present invention is not limited to this, and for example, a wet extrusion molding machine or the like may be used.

Further, in this embodiment, a rotating disc-shaped grinder device is used for cutting, but the present invention is not limited to this, and for example, a rotating belt-shaped sander or the like may be used.

In addition, the E-type core has a rough-ground layer surface formed on the central magnetic leg during the polishing process, and is made into a coarsely-ground thick part by assembling a transformer, etc., to have the same effect as a conventional micro-gap. However, the rough-ground layer surface may be formed on one or both of the first side magnetic leg and the second side magnetic leg.

Further, although the rough-ground layer surface is formed on both E-type cores, it may be formed on either one of the E-type cores.

Further, although E-type cores are used to construct the transformer and the like, the present invention is not limited to this, and for example, an E-type core and a ■-type core may be combined.

Further, the contact surface, etc. on which the E-type core is brought into contact with another E-type core, has been processed into a planar shape, but the present invention is not limited to this. The rough polishing layer surface may be formed on the uneven portion.

(Effects of the Invention) Since the E-type core according to the present invention is configured as described above, it has the following effects.

(1) A central magnetic leg, a pair of side magnetic legs arranged opposite to each other so as to sandwich the central magnetic leg, and a yoke portion that connects one end of the central magnetic leg and one end of each of the pair of side magnetic legs to each other. An E-shaped core consisting of is roughened on the side opposite to the side magnetic leg connecting surface connected to the yoke portion and on the opposite side of the central magnetic leg connecting surface connected to the yoke portion, The roughened part is
Since the micro-gaps are used to adjust the magnetic properties of transformers, etc., which are constructed by abutting and combining the mold cores, there is no need for high processing precision to form the micro-gaps, and the E-type core is It has an excellent effect of improving production efficiency.

2) In addition, when mass producing the E-type core, it is difficult to cut the microgaps, which are used as a means of adjusting the magnetic characteristics of the transformer, etc., with uniform accuracy; Furthermore, since the roughened surface processed portion is made equivalent to the micro-gaps, the roughened surface processed portion can be formed easily and with uniform accuracy. This has an excellent effect in that it is not necessary to use a precision device, and therefore the cost of the E-type core, and hence the transformer, etc., can be reduced.

FIG.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of an E-type core according to the present invention. FIG. 2 is a perspective view showing the state of roughening and polishing of an E-type core according to the embodiment. FIG. 4 is a perspective view showing another embodiment of the E-type core according to the present invention, and FIG. 5 is a plan view showing a transformer constructed by combining E-type cores according to the present invention. A perspective view showing the state of surface roughening and polishing of the E-type core, FIG. 6 is a plan view showing a transformer constructed by combining E cores according to the same embodiment, and FIG. 7 is a conventional FIG. 8 is a perspective view showing an E-type core, and shows how other conventional E-type cores are combined.
・ 53 ・ 62 ・ 63 ・ 64 ・ , E-type core, 52...Central ri1) 1) 1, - First side magnetic leg, 54... Second side magnetic leg/yoke part, - Central magnetic leg polishing Surface, 1st III magnetic leg polishing surface, 2nd side magnetic leg polishing surface.

Claims (1)

[Claims] (1) A central magnetic leg, a pair of side magnetic legs arranged opposite to each other so as to sandwich the central magnetic leg, and a yoke portion that connects one end of the central magnetic leg and one end of each of the pair of side magnetic legs to each other. In the E-type core, the surface opposite to the side magnetic leg connecting surface connected to the yoke portion is roughened on the opposite surface of the central magnetic leg connecting surface connected to the yoke portion. E type core.