JPH0850843A - Electromagnet device of electromagnetic contactor - Google Patents

Abstract

PURPOSE:To improve the use efficiency of a magnetic path member where the section of the magnetic path is equalized, by forming a fixed iron core, coupling the ends on bottom plate side of pillar-shaped foot iron cores with each other by a ferromagnetic plate. CONSTITUTION:The magnetic path on the side of a fixed iron core is made of two pieces of foot iron cores 16, two sheets of ferromagnetic plates 21, and a bottom plate 17 serving for the purpose of blocking the bottom face of a lower case 13, too. Hereby, the ferromagnetic plate 21 can take its area all inside the peripheral wall of the lower case 13, so the required sectional area of the magnetic path between the ends on bottom plate side of the foot iron cores 16 can be obtained with thin thickness. Moreover, a required number of coils can be obtained without raising the level of the topside of the coil 11. Accordingly, this can be obtained by laying thin die-cut plates on the ferromagnetic plate, so this is equal all over the overall length of the magnetic path, and besides the use efficiency of the material can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet device for an electromagnetic contactor which uses an electromagnet to drive and drive a movable contact, and more particularly, to a movable iron core connected to a movable contact support for holding the movable contact. The present invention relates to an electromagnetic contactor electromagnet device in which a plurality of columnar leg iron cores are erected and fixed on a bottom plate that closes a lower end surface of an electromagnetic contactor fixing frame that accommodates these iron cores.

[0002]

2. Description of the Related Art As an electromagnetic contactor equipped with this type of electromagnet device, an example of a bridge-type electromagnetic contactor structure that has been widely used in the past is shown in FIG. In this example, the electromagnetic contactor includes an opening / closing contact portion 1 and an electromagnet device 2 , the opening / closing contact portion 1 is provided outside the upper side of the upper case 3, and has a fixed contact 4 at one end.
a and two U-shaped fixed contactors 4 having terminal screws 4b at the other end with both fixed contacts 4a, 4a inside
Is attached to the upper surface of. A movable contact support 5 is connected between the opposed fixed contacts 4-4 by a pin 7 to a movable iron core 6 of an electromagnet device 2 housed in a fixed frame composed of an upper case 3 and a lower case 13, and is vertically moved. It is slidable to. A movable contact 8 having movable contacts 8a-8a capable of bridging the fixed contacts 4a-4a attached to the two fixed contacts 4-4 is attached to the movable contact support 5 via a contact spring 9. ing. The open / close contact portion 1 formed by the fixed contact member and the movable contact member 8 is covered with an extinguishing cover 10. An electromagnet device 2 housed in a space defined by an upper case 3, a lower case 13, and a bottom plate 17 made of a ferromagnetic material, which closes the lower end surface of the lower case, is fixed to the bottom plate 17 to form a coil. 11 includes a fixed core 12 into which the fixed core 11 is fitted, a coil 11, and a movable core 6 that faces the fixed core 12 and is supported by a return spring 14. The movable core 6 is attracted to and released from the fixed core 12. The movable contact support 5 slides in the vertical direction. In this example, the fixed iron core 12 is formed in a U-shape, and two opposite sides of the U-shape constitute a leg iron core in the fixed iron core 12, and a central piece is an end of each of the two leg iron cores on the side of the bottom plate 17 side. It constitutes the magnetic path between the parts.

In such a structure, the excitation of the coil 11 is cut off, and the movable iron core 6 is fixed by the force of the return spring 14 to the fixed iron core 1.
When released from 2, the movable contact support 5 is moved to the movable contact 8a.
Is separated from the fixed contact 4a to open the electromagnetic contactor. When the coil 11 is energized again and the fixed iron core 12 attracts the movable iron core 6, the movable contact 8a comes into contact with the fixed contact 4a to close the electromagnetic contactor.

In the electromagnetic contactor having the electromagnet device 2 as described above, when the voltage applied to the coil 11 is an alternating current, the movable iron core 6 and the fixed iron core 6 are arranged to minimize the eddy current loss in the iron core. As shown in FIG. 12, it was necessary to manufacture 12 by stacking a large number of thin iron plates 12a whose surfaces are insulation-coated and crimping and fixing them with rivets 15. However, since the loss due to the eddy current can be ignored in the electromagnet device having a function of rectifying the applied voltage even if the applied voltage is DC or the applied voltage is AC, the iron core may have a lumped structure. because there is,
Sintered material, profile drawing, extrusion molding, or Fig. 12
Even if the block having the shape shown in FIG. 12 is formed by using a plate having a large plate thickness t shown in FIG. 12, sufficient performance can be obtained.
However, since the sintered material and the deformed drawn material are expensive, and the extruded product and the laminated structure shown in FIG. 12 are also expensive, the structure of the electromagnet device in such a case is conventionally A configuration such as 13 has been generally adopted.
In FIG. 13, the fixed iron core is composed of two leg iron cores 16 cut from a thick steel plate and a bottom plate 17 made of a steel plate. Further, the bottom plate 17 is fixed to the lower case 13 made of casting resin by screws 18, and the leg core 16 is fixed to the bottom plate 17 by screws 19.

By the way, in the electromagnet device having the structure shown in FIGS. 11 and 13, even if the excitation of the coil 11 is cut off, the attraction force remains due to the residual magnetic flux in the iron core, and the electromagnetic force can be moved by the force of the return spring 14. There is a possibility that the iron core 6 may not be released from the fixed iron core 12 or the leg iron core 16. Therefore, conventionally, as shown in FIGS. 11 and 13, a non-magnetic plate such as sunteres is bonded and attached to the surface 6a of the movable iron core 6 facing the fixed iron core 12 or the leg iron core 16 by brazing or resistance welding. This had solved this problem.

[0006]

In FIG. 11 which is one of the conventional devices, considering the efficiency of the electromagnet,
It is necessary that the magnetic path cross-sectional area S ₁ of the movable iron core 6 and the magnetic path cross-sectional areas S ₂ and S ₃ of the fixed iron core 12 are all equal. Therefore, if a sufficient cross-sectional area of S ₃ is taken and the outer diameter dimension D of the electromagnetic contactor is kept at a certain value, the winding dimension C of the winding of the coil 11 may not be sufficient. However, in order to generate a certain level of attractive force as the electromagnet, a corresponding ampere-turn (number of turns N × excitation current I) is naturally required. In this case, in the case of a type that applies a DC voltage, the inductive reactance is ignored. Therefore, if the number of turns N of the coil is reduced and the resistance of the coil is reduced, a large amount of current will flow in the coil, which may affect the burnout of the coil. Therefore, in general, a method of securing a necessary ampere-turn by increasing the number of turns N to increase the resistance of the coil and suppressing the exciting current I to be small is adopted. From the above, in the structure as shown in FIG. 11, there is a problem that the performance may not be sufficiently satisfied unless the outer dimension D of the electromagnetic contactor is increased.

A tag having an electromagnet device as shown in FIG.
Ip's electromagnetic contactor is of the type shown in Fig. 11.
In order to solve the problem of, the horizontal magnetic path in the fixed iron core 12
Since the bottom plate 17 also serves as the structure, the coil 11
The winding width C of the winding can be sufficiently set. But this
Magnetic field cross-sectional area S of the bottom plate 17 of₃Is determined by b × t shown in FIG.
This is because the b dimension is larger than the facing width of the leg core 16
Magnetic field cross-sectional area S required due to large size₃Can get a comparison
Of the electromagnetic contactor can be made smaller, and the external dimensions D of the electromagnetic contactor can be reduced.
There is an issue that seems to be greatly contributing to. That
Is the magnetic path cross-sectional area S ₃B dimension that constitutes the outside of the electromagnetic contactor
There is a limit to the size because it is restricted by the
Is a point that needs to be compensated by increasing the t dimension. Board
When the thickness t exceeds about 3.2 mm, it is pressed by a press machine.
Can be supplied as roll material that can be rewound to a flat plate during punching
Since it can not be done, it will be a manual supply by human power,
There are drawbacks when considering productivity. Also, t is 4 to 5 mm
Exceed the tonnage of the press or
Since it is impossible to machine the machine itself, use gas etc.
There is no choice but to rely on cutting processing. Moreover, the bottom plate is magnetic
Not only as a road, but also as a structure
Since it plays a role, mounting screws as shown in Fig. 14
Even when processing the hole 17a for 18, the cutting work
Separately from burring tap processing (burring: flat plate down
Drill a hole and use a conical or cylindrical punch to project
It is necessary to perform a molding process to raise the
In the case of engineering, this process can be performed simultaneously in the press mold.
Is). Therefore, thick bottom plates are not suitable for mass production.
The number is increasing and it becomes a high cost electromagnet device.
U

Next is brazing of non-magnetic plates. This also takes a long time for brazing because the unit price of silver which constitutes the brazing material is very high and a furnace for joining is required. As a result, there is a problem that it causes a cost increase. An object of the present invention is to equalize the magnetic path cross-sectional area of the fixed core side to the necessary cross-sectional area over the entire length of the magnetic path at a low cost, without reducing the winding width of the coil winding, and
To provide a structure of an electromagnet device which can inexpensively interpose a non-magnetic plate in the closed magnetic circuit for reducing residual magnetic flux remaining in the closed magnetic circuit including a movable iron core and a fixed iron core of the electromagnet device after the coil current is cut off. Is.

[0009]

In order to solve the above problems, in the present invention, an electromagnet device having the structure described at the beginning, that is, a movable iron core connected to a movable contact support that holds the movable contact is attracted. 2. The electromagnet device for an electromagnetic contactor, wherein the fixed iron core comprises a plurality of columnar leg iron cores erected and fixed to a bottom plate that closes a lower end surface of an electromagnetic contactor fixing frame that accommodates these iron cores. As described, the bottom plate side ends of the columnar leg iron cores are connected to each other by the ferromagnetic plate.

In this case, as described in claim 2, the connection between the end portions of the columnar leg cores on the bottom plate side by the ferromagnetic plate is
It is preferable to stack the ferromagnetic plate on the upper surface of the bottom plate. Alternatively, the connection by a ferromagnetic plate is performed as described in claim 3,
A ferromagnetic plate may be stacked on the back surface of the bottom plate.
In addition, the bottom plate on which the columnar leg iron core is erected and fixed is defined in claim 4.
This may be a non-magnetic plate, as described in 1.

According to a fifth aspect of the present invention, the ferromagnetic plate may have a planar shape capable of simultaneously contacting all of the bottom plate side end faces of the plurality of columnar leg iron cores and the entire area of each end face, Further, as described in claim 6, all of the bottom surface side end faces of the plurality of columnar leg cores are brought into contact with the upper surface of the bottom plate, and the thickness of the plurality of columnar leg iron cores is part of the bottom plate side peripheral surface of the plurality of columnar leg cores. Alternatively, notches or holes may be formed at the same time so that they are all in close contact with each other.

Further, as described in claim 7, it is very suitable to use, as the roll material, a plate having a thickness capable of being wound and rewound on a flat plate as the ferromagnetic plate. In addition, the electromagnet device having the configuration described at the beginning, that is, the fixed iron core that attracts the movable iron core connected to the movable contactor support that holds the movable contactor is the lower end surface of the electromagnetic contactor fixed frame that accommodates these iron cores. An electromagnet device for an electromagnetic contactor, in which a plurality of columnar leg iron cores are erected and fixed to a bottom plate to be closed, as in the invention according to claim 8, the bottom plate side end faces of the plurality of columnar leg iron cores and the bottom plate are provided. It is very suitable if a non-magnetic plate is interposed between and closely contacted to the end faces of the leg cores on the bottom plate side.

In this case, the peripheral shape of the non-magnetic plate may be a shape capable of simultaneously enclosing all of the bottom plate side end faces of the plurality of columnar leg iron cores as described in claim 9, or As described in claim 10, the plurality of columnar leg iron cores may have the same shape as the bottom plate side end faces, or may be included in the peripheral shape of each bottom plate side end face.

[0014]

If the electromagnet device is constructed as described in claim 1, the width of the ferromagnetic plate for connecting the bottom plate side ends of the plurality of columnar leg iron cores to the width of the inner surface of the peripheral wall of the electromagnetic contactor fixing frame is large. Since the width can be the width, the required magnetic path cross-sectional area can be obtained with a thin ferromagnetic plate. Further, since the required plate thickness can be obtained by stacking plates having a smaller plate thickness, the ferromagnetic plate can always be constituted by a press punchable thickness suitable for mass production. ,
It is possible to obtain an electromagnet device having a uniform magnetic path cross-sectional area over the entire magnetic path and good material utilization efficiency without increasing the size of the electromagnetic contactor.

As described above, since the ferromagnetic plate connecting the bottom plate side ends of the plurality of columnar leg iron cores can be made thin, it is possible to reduce the thickness of the ferromagnetic plate. Even if the winding width of the electromagnetic coil winding is reduced by this, the number of windings of the coil can be secured by utilizing the existing radial space of the winding space of the coil winding frame. It is possible to avoid increasing the size of the electromagnetic contactor.

Further, even if the ferromagnetic plate is placed on the back surface of the bottom plate as described in claim 3, it is possible to substantially avoid the size increase of the electromagnetic contactor. The above claims 2 and 3
It is also possible to avoid the size increase of the electromagnetic contactor by using the above together and superposing the ferromagnetic plate on the upper surface and the back surface of the bottom plate separately. When the bottom plate is a non-magnetic plate and is an insulating plate, for example, the fixed frame of the electromagnetic contactor is usually a cast resin molded product, so that the electromagnet serving as the charging part is insulated. Since it is surrounded by objects, it can be a highly safe electromagnetic contactor. Further, if the bottom plate is made of a non-magnetic metal plate such as stainless steel, it can be used as a liner for reducing the residual magnetic flux in the iron core when the ferromagnetic plate is stacked on the back surface of the bottom plate as described in claim 3. Since the conventional non-magnetic plate is no longer required, the bottom plate can be moved inward of the fixed frame by the thickness of the conventional non-magnetic plate to make an electromagnetic contactor of the same size as when the bottom plate is a ferromagnetic plate. As a result, the cost required to reduce the residual magnetic flux can be reduced.

When the ferromagnetic plate is overlaid on the upper surface of the bottom plate, the ferromagnetic plate is provided on all of the end faces on the bottom plate side of the plurality of columnar leg cores and on the entire area of each end face. If the planar shape is such that they can be contacted at the same time, there are few restrictions on the shape, so that the ferromagnetic plate can be obtained at low cost, and the cost of the electromagnetic contactor can be kept low. Further, when the ferromagnetic plate is overlaid on the upper surface of the bottom plate, as described in claim 6, all of the bottom surface side end faces of the plurality of columnar leg iron cores are brought into contact with the upper surface of the bottom plate and the surface having a plurality of pillars is thicker than itself. If a notch or a hole is formed in a part or all of the peripheral surface of each leg core on the bottom plate side at the same time so as to come into contact with each other at the same time, the ferromagnetic plate is misaligned just by fitting it into the leg core. And the magnetic path between the bottom plate side ends of the leg cores can be obtained in less assembly time.

Further, as described in claim 7, by using a plate having a thickness capable of being wound on the ferromagnetic plate as a roll material and being rewound on a flat plate, punching by a press machine becomes possible, and the ferromagnetic plate is obtained. Also, mass production can be performed efficiently, and a ferromagnetic plate can be obtained at low cost. Further, the electromagnetic contactor having the configuration described at the beginning, that is, the fixed iron core that attracts the movable iron core connected to the movable contactor support that holds the movable contactor is the lower end surface of the electromagnetic contactor fixed frame that accommodates these iron cores. An electromagnet device of an electromagnetic contactor in which a plurality of columnar leg iron cores are erected and fixed to a bottom plate that closes the bottom plate of the plurality of columnar leg iron cores. If a non-magnetic plate is placed in close contact with the end faces of the bottom cores of each leg core, the non-magnetic plate can be inserted by simply making a screw insertion hole in the non-magnetic plate. For fixing in a closed magnetic circuit that includes, does not require a long time as in the case of conventional brazing or resistance welding, which is required because the fixed position is the facing surface of both movable and fixed iron cores, and The cost can be reduced.

If this non-magnetic plate is formed as described in claim 9, the non-magnetic plate can be obtained at a low cost because there are few restrictions on the shape, and if it is formed as described in claim 10. , The height of the leg core itself is left as it is, and a necessary gap is obtained between the upper surface of the leg core and the lower surface of the movable core, and the height from the lower surface of the non-magnetic plate to the upper surface of the leg core is less than that of the non-magnetic plate. Since the height is increased by the thickness, there is a margin in the height of the coil, that is, the winding width of the coil winding, and the number of windings can be increased to provide an electromagnet device that can be driven with a small exciting current. If the height of the leg core is reduced by the thickness of the non-magnetic plate, the electromagnetic contactor can be downsized accordingly.

[0020]

1 and 2 show a first embodiment of the first aspect of the present invention. FIG. 1 shows the configuration of the fixed core side of the electromagnet device in the assembled state of the electromagnetic contactor.
Shows the configuration of the electromagnet device only on the fixed core side. In the cross section of the electromagnetic contactor shown in FIG.
The same reference numerals as those in FIGS. 11 and 13 are given, and since these respective parts have already been described, the description thereof will be omitted here. In this embodiment, the magnetic path on the fixed iron core side is composed of two leg iron cores 16, two ferromagnetic plates 21, and a bottom plate 17 which also serves to close the lower end surface of the fixed frame. . In this embodiment, the ferromagnetic material 21 has a highly versatile JIS standard [G3101 (rolled steel plate for general structure).
SS400] is used. In order to construct the magnetic path on the fixed iron core side in the electromagnetic contactor fixed frame as shown in FIG. 1, first, as shown in FIG. 2, the rear leg iron core 16 in which the ferromagnetic plate 21 is superposed on the upper surface of the bottom plate 17 is provided. Standing up, the screw 19 is screwed in from the lower surface side of the bottom plate 17, and the three members are fastened together. Then, the coil 11 is fitted into each leg iron core 16, inserted into the fixed frame from the lower end surface side of the fixed frame, and the bottom plate 17 is screwed into the bottom plate 17.
To the fixed frame.

Since the ferromagnetic plate 21 can occupy the entire inner surface of the peripheral wall of the fixed frame, the required cross-sectional area of the magnetic paths between the ends of the leg cores 16 on the bottom plate side can be obtained with a thin plate thickness. Without increasing the height of the upper surface of the coil 11, it is possible to obtain the coil with the required number of turns by utilizing the conventional radial allowance of the winding space of the coil winding frame. Therefore, the ferromagnetic plate 21 has a plate thickness of 3.2 mm or less and a plate thickness that can be wound as a roll material, for example, JI.
It is possible to use S: G3141 (cold rolled steel plate and steel strip) SPCC, which is punched with a press machine. The leg iron core 16 is made of a thick steel plate and cut into a required size.

FIGS. 3 and 6 show the magnetic path structure on the fixed core side according to the second embodiment of the first aspect of the present invention. The ferromagnetic plate 22 to be superposed on the upper surface of the bottom plate 21 is formed by punching a roll material into a H-shape formed by cutting a rectangular plate from both sides with a press machine. To form the magnetic path on the fixed core side, first, the bottom plate 1
7. The leg iron core 16 is erected on the upper surface of 7, and the leg iron core 16 is fixed to the upper face of the bottom plate 17 from the lower face side of the bottom plate 17 with a screw (not shown), and then the H-shaped ferromagnetic plate is placed between the leg iron cores 16. It is done by fitting it in. In this configuration, the ferromagnetic plate is used for the leg core 1.
Since it is not necessary to tighten together with 6, the screw tightening work is facilitated, and the height of the H-shape can be set to fill the inner surface of the peripheral wall of the electromagnetic contactor fixing frame, so that the same as in the first embodiment. By lowering the stacking height of the ferromagnetic plates, it is possible to reduce the magnetic resistance of the magnetic path between the end portions of the leg cores 16 on the bottom plate side. 4 and 5 are modifications of the ferromagnetic plate shown in FIG. 3, and it is possible to obtain substantially the same performance even with such a shape.

7 and 8 show a third embodiment of the invention of claim 1. In this embodiment, the ferromagnetic plate 21 is arranged on the back surface of the bottom plate 17, and the height of the electromagnetic contactor is made equal to that of the first embodiment to obtain a magnetic path sectional area equivalent to that of the first embodiment. At the same time, by using the back surface of the bottom plate with more space, the area of the ferromagnetic plate 21 can be increased and the installation interval of the electromagnetic contactors can be increased. it can. Further, the bottom plate 17 can be made thin.

In the first to third embodiments described above,
Although the bottom plate 17 is made of a ferromagnetic material, it is not always required to be a ferromagnetic material. This is because a magnetic path is formed by the ferromagnetic body 21, and if the magnetic path cross-sectional area required is not increased without increasing the height of the electromagnetic contactor, the ferromagnetic plate 2 can be formed.
If it is secured by 1, there is no need to make the bottom plate 17 a ferromagnetic material. In such a case, the bottom plate 17 can be used as an insulating plate to insulate the electromagnet serving as the charging section,
It can be a highly safe electromagnetic contactor. In this case, the insulating plate, as a resin for impregnating the paper or cloth that is the base material of the insulating plate, among the plastics, a phenol plate using a phenolic resin that belongs to an addition condensation type and shows thermosetting properties, and It is preferable to use an organic insulating plate that is resistant to mechanical shock, such as a so-called plastic plate formed by molding a thermoplastic material that accounts for about 80% of the plastic that is manufactured. Further, in the third embodiment, the bottom plate 17 is made of a non-magnetic metal plate such as stainless steel, so that the conventional non-magnetic plate 20 for reducing residual magnetic flux (FIG. 13) can be omitted.

9 and 10 show an embodiment of the present invention. In this embodiment, a non-magnetic plate for reducing the residual magnetic flux remaining in the closed magnetic circuit of the electromagnet device after the excitation current of the coil is cut off is closely attached to the bottom plate side end surface of the leg core and is inserted in the closed magnetic circuit. It shows an example of how to intervene. In the cross section of the electromagnetic contactor shown in FIG. 9, parts other than the fixed iron core part are denoted by the same reference numerals as those in FIG. 11, and since these parts have already been described, description thereof will be omitted here. In this embodiment, the non-magnetic plate 23 is formed by punching a stainless steel plate into a shape congruent with the bottom plate side end surface shape of the leg core 16 by a press machine. When installing the fixed core in the fixed frame of the electromagnetic contactor in the state of FIG. 9,
As shown in FIG. 10, after overlaying the non-magnetic plate 23 on the upper surface of the bottom plate 17, the leg iron core 16 is further erected on the upper surface of the non-magnetic plate 23, and the screws 19 are screwed in from the lower surface side of the bottom plate 17 to form a three-body unit. Tighten together. Subsequent assembling work into the fixed frame is performed in the same manner as in the case of the first embodiment. In this way, by making the non-magnetic plate 23 have a shape that is congruent with the bottom plate side end surface of the leg iron core 16 or a shape that is included in the bottom plate side end face shape, it is possible to move without changing the height of the leg iron core itself. Since the required air gap length can be obtained between the iron core and the fixed iron core, and the coil height has a margin due to the thickness of the non-magnetic plate 23, the coil height is correspondingly increased to increase the number of winding turns. It is also possible to increase the exciting current and reduce the exciting current. Also,
If the height of the leg core is reduced by the thickness of the non-magnetic plate 23, the height of the electromagnetic contactor can be reduced accordingly. Also,
Since the fixing of the non-magnetic plate 23 does not require operations such as brazing and resistance welding as in the conventional case, the number of manufacturing steps of the electromagnet device is reduced, and the electromagnetic contactor can be manufactured at low cost. In the nonmagnetic plate interposing method according to the present embodiment, the height of the coil is allowed to be equal to the thickness of the nonmagnetic plate without changing the height of the leg iron core itself. When applied to the electromagnet device, the influence of the thickness of the ferromagnetic plate overlaid on the upper surface of the bottom plate on the coil height can be offset, and the electromagnet device according to claim 1 can be realized more easily.

[0026]

In the present invention, since the electromagnet device of the electromagnetic contactor is configured as described above, the effects described below can be obtained. In the structure according to the first aspect of the present invention, the magnetic paths between the bottom plate side ends of the plurality of leg cores forming the fixed iron core are formed by connecting the bottom plate side ends with a ferromagnetic plate. Therefore, the magnetic path cross section of the electromagnet device can be easily made uniform, and the width of the ferromagnetic plate can be
Since the inner surface of the peripheral wall of the fixed frame of the electromagnetic contactor can be fully filled, the thickness of the ferromagnetic plate can be reduced, and the coil upper surface position can be suppressed to obtain the coil with the required number of turns. It is possible to provide an electromagnet device that does not increase in size and has good use efficiency of the magnetic path member.

Further, since the magnetic path between the bottom plate side ends of the plurality of leg iron cores constituting the fixed iron core is formed by using the ferromagnetic plate, a thin plate material which can be easily punched by a press machine. A magnetic path can be formed by stacking a required number of sheets, and mass production of electromagnet devices can be efficiently performed. Claim 2
In the electromagnet device described in (3) and (3), the ferromagnetic plate is overlaid on the bottom plate and the end portions of the leg cores on the bottom plate side are connected to each other, so that it is possible to avoid increasing the size of the electromagnetic contactor.

Further, in the electromagnet device according to claim 3,
Since the bottom surface of the bottom plate, which has plenty of space, is stacked on top of the ferromagnetic plate, the area of the ferromagnetic plate can be increased, and when stacking on the top surface of the bottom plate, two ferromagnetic plates can be used as one. Alternatively, since the bottom plate can be made thinner, the cost of the electromagnetic contactor can be reduced. In the electromagnet device according to claim 4, when the bottom plate is made of a non-magnetic plate, it can be an electromagnetic contactor with high safety by using it as an insulating plate. By using a magnetic metal plate, the conventional non-magnetic plate for reducing residual magnetic flux can be omitted, and the cost of the electromagnetic contactor can be reduced.

In the electromagnet device according to a fifth aspect of the present invention, the ferromagnetic plate has a planar shape capable of simultaneously contacting all of the bottom plate side end faces of the plurality of columnar leg iron cores and the entire area of each end face. In addition, there are few restrictions on the plane shape such as vertical and horizontal dimensions, the ferromagnetic plate can be obtained at low cost, and the cost of the electromagnetic contactor can be kept low. In the electromagnetic contactor according to claim 6, all of the bottom surface side end faces of the plurality of columnar leg cores of the ferromagnetic plate are in contact with the upper surface of the bottom plate, and the bottom plates of the columnar leg cores each having a plurality of thicknesses are naturally formed. 6. Since notches or holes are formed in a part or all of the side peripheral surface so as to be in contact with each other at the same time, it is easy to assemble the ferromagnetic plate and the assembly time is shortened.
Compared with the ferromagnetic plate described above, the cost increase of the electromagnetic contactor can be suppressed by offsetting the cost increase due to the complicated planar shape.

In the electromagnet device according to the seventh aspect, since the ferromagnetic plate is a plate having a thickness capable of being rolled up and rewound on a flat plate, the ferromagnetic plate can be efficiently mass-produced by using a press machine. The cost of the electromagnetic contactor can be kept low. In the electromagnet device according to claim 8, since the peripheral shape of the non-magnetic plate is such that all of the bottom plate side end faces of the plurality of columnar leg iron cores can be included at the same time, there are few restrictions on the vertical and horizontal dimensions. The non-magnetic plate can be obtained at low cost.

According to a tenth aspect of the present invention, in the electromagnet device, the peripheral shape of the non-magnetic plate is equal in size to the bottom plate side end surface of the plurality of columnar leg iron cores, or the peripheral shape of each bottom plate side end surface is included. Therefore, the height of the leg core itself is left as it is, and a necessary gap is obtained between the upper surface of the leg core and the lower surface of the movable core, and the height from the lower surface of the non-magnetic plate to the upper surface of the leg core is not Since the height of the magnetic plate is increased by the thickness of the coil, there is a margin in the height of the coil, that is, the winding width of the coil winding, and the number of windings can be increased to provide an electromagnet device that can be driven with a small exciting current. Also, if the height of the leg core is reduced by the thickness of the non-magnetic plate, the electromagnetic contactor can be downsized accordingly.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the entire electromagnetic contactor showing a first embodiment of the electromagnet device configuration according to the invention of claim 1 in a state in which the electromagnet device is incorporated in the electromagnetic contactor.

FIG. 2 is a perspective view showing a magnetic path configuration on the fixed core side in the electromagnet device shown in FIG.

FIG. 3 is a perspective view showing a first embodiment different from FIG. 2 of a ferromagnetic plate structure for a fixed iron core side magnetic path configuration in the electromagnet device shown in FIG.

4 is a perspective view showing a second embodiment different from FIG. 2 of the ferromagnetic plate structure for the magnetic path configuration on the fixed iron core side in the electromagnet device shown in FIG.

5 is a perspective view showing a third embodiment different from FIG. 2 of the ferromagnetic plate structure for the fixed core side magnetic path configuration in the electromagnet device shown in FIG.

6 is a perspective view showing a fixed core side magnetic path configuration using the ferromagnetic plate shown in FIG. 3;

FIG. 7 is a sectional view of the entire electromagnetic contactor showing a second embodiment of the electromagnet device configuration according to the invention as set forth in claim 1, showing a state in which the electromagnet device is incorporated in the electromagnetic contactor.

8 is a perspective view of the ferromagnetic plate shown in FIG.

FIG. 9 is a sectional view of the entire electromagnetic contactor showing an embodiment of the electromagnet device configuration according to the invention of claim 8 in a state where the electromagnet device is incorporated in the electromagnetic contactor.

10 is a perspective view showing a method of interposing a non-magnetic plate for reducing residual magnetic flux, which is adopted in the electromagnet device shown in FIG. 9, in a closed magnetic circuit of the electromagnet device.

FIG. 11 is a cross-sectional view of the entire electromagnetic contactor showing a first example of the configuration of a conventional electromagnet device in a state where the electromagnet device is incorporated in the electromagnetic contactor.

12 is a perspective view showing a structure of a fixed iron core in the electromagnet device shown in FIG.

FIG. 13 is a cross-sectional view of the entire electromagnetic contactor showing a second example of a conventional electromagnet device configuration in which the electromagnet device is incorporated in the electromagnetic contactor.

14 is a perspective view showing the structure of a fixed iron core in the electromagnet device shown in FIG.

[Explanation of symbols] 2 Electromagnet device 3 Upper case 4 Fixed contact 5 Movable contact support 6 Movable iron core 7 Pin 8 Movable contact 11 Coil 12 Fixed iron core 13 Lower case 16 Leg iron core 17 Bottom plate 19 Screw 21 Ferromagnetic plate 22A Ferromagnetic plate 23B Ferromagnetic plate 22C Ferromagnetic plate 23 Non-magnetic plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Sekiguchi 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. No. 1 inside Fuji Electric Co., Ltd.

Claims (10)

[Claims] 1. A fixed iron core for attracting a movable iron core, which is connected to a movable contactor support for holding a movable contactor, has a plurality of pillars on a bottom plate which closes a lower end surface of an electromagnetic contactor fixing frame for accommodating these iron cores. In an electromagnet device of an electromagnetic contactor in which leg cores are erected and fixed, the bottom plate side ends of the columnar leg cores are connected to each other by a ferromagnetic plate. apparatus. 2. The electromagnetic device according to claim 1, wherein the end portions of the columnar leg iron cores on the bottom plate side are connected by a ferromagnetic plate by stacking the ferromagnetic plates on the upper surface of the bottom plate. Electromagnetic device for contactor. 3. The electromagnetic device according to claim 1, wherein the ends of the columnar leg cores on the bottom plate side are connected by a ferromagnetic plate by stacking the ferromagnetic plates on the back surface of the bottom plate. Electromagnetic device for contactor. 4. The electromagnet device for an electromagnetic contactor according to claim 1, 2 or 3, wherein the bottom plate is a non-magnetic plate. 5. The ferromagnetic plate to be stacked on the upper surface of the bottom plate according to claim 2, wherein the ferromagnetic plate is a flat surface capable of simultaneously contacting all bottom plate side end faces of a plurality of columnar leg cores and the entire area of each end face. An electromagnet device for an electromagnetic contactor having a shape. 6. The ferromagnetic plate according to claim 2, wherein the ferromagnetic plate to be stacked on the upper surface of the bottom plate is such that all the end faces on the bottom surface side of the plurality of columnar leg iron cores are in contact with the upper surface of the bottom plate and the surface having a thickness is naturally formed. An electromagnet device for an electromagnetic contactor, wherein a notch or a hole is formed in a part or all of the bottom plate side peripheral surface of each of the plurality of columnar leg iron cores so as to be in contact with each other at the same time. 7. The ferromagnetic plate according to any one of claims 1 to 6, characterized in that a plate having a thickness capable of being wound and rolled back to a flat plate is used as the roll material. Electromagnetic device for electromagnetic contactor. 8. A fixed iron core for attracting a movable iron core connected to a movable contact support for holding a movable contact is provided with a plurality of pillars on a bottom plate closing a lower end surface of an electromagnetic contactor fixing frame for accommodating these iron cores. In an electromagnet device of an electromagnetic contactor in which leg iron cores are erected and fixed, a bottom plate is a ferromagnetic plate, and a non-magnetic plate is provided between each bottom plate side end face of the plurality of columnar leg iron cores and the bottom plate. An electromagnet device for an electromagnetic contactor, which is inserted in close contact with each bottom plate side end surface of the core. 9. The non-magnetic plate interposed between the bottom plate-side end faces of the plurality of columnar leg cores and in close contact with the bottom plate-side end faces according to claim 8, An electromagnet device for an electromagnetic contactor, characterized in that the peripheral shape is such that all end faces of the plurality of columnar leg cores on the bottom plate side can be simultaneously included. 10. The non-magnetic plate interposed between the bottom plate-side end faces of the plurality of columnar leg cores and in close contact with the bottom plate-side end faces according to claim 8, The peripheral shape is of the same size as the bottom plate side end surface of the plurality of columnar leg iron cores,
Alternatively, the electromagnet device of the electromagnetic contactor is characterized in that it is included in the peripheral shape of the end face of each bottom plate.