JPS6325689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to an AC electromagnet used in AC electromagnetic contactors, AC solenoids, and the like.

Conventionally, in medium to large plunger type AC electromagnets, a yoke 5' and a movable iron core 6 made of laminated silicon steel plates have been used to reduce eddy current loss, as shown in FIGS. 1a and 1b. Also, it is small,
Some models use non-laminated yokes and movable iron cores in which eddy current loss is not a problem, but these AC electromagnets are less efficient than laminated ones, and as shown in Figure 2. The I-type movable core 6' and fixed core 7, which are relatively easy to laminate, are laminated, and only the yoke 5'' is not laminated.However, in this example, the yoke 5'' is not laminated.
The magnetic circuit composed of the fixed iron core 7 and the movable iron core 6' does not become a completely closed circuit (that is, an air gap is created between the yoke 5'' and the movable iron core 6'), and therefore the operation is inefficient and difficult. The subsequent holding force is weak, and moreover, beats are more likely to occur.By the way, the AC electromagnet is equipped with a corner coil 4 on either the magnetic pole surface of the yoke 5 or the movable iron core 6 in order to prevent the beat noise when energized. It is necessary to provide
This corner coil 4 has a hoop-shaped groove on the magnetic pole surface, and the corner coil 4 made of copper thread or aluminum metal material is fixed to this groove by press-fitting, fitting, welding, brazing, etc. A hoop-shaped groove is formed by punching out a silicon steel plate provided with a concave groove, and laminating the silicon steel plates. However, the above-mentioned work is difficult, and it is necessary to polish the magnetic pole surface in order to stabilize the effect of the corner coil 4, which makes the work troublesome and makes it impossible to stack and assemble extremely small yokes. However, the machining accuracy of the hoop-shaped groove is poor, making it difficult for the corner coil 4 to fit into the groove, resulting in direct impact from the operation of the electromagnet, resulting in problems such as the corner coil 4 falling off or breaking. It had the disadvantage of being easy.

In view of the above-mentioned points, the present invention provides an AC electromagnet in which a corner coil can be easily arranged on a magnetic pole face, which can be miniaturized, and in which troubles such as corner coils falling off or breaking are less likely to occur. With the goal.

The present invention will be described in detail based on an example in which the present invention is implemented in an AC solenoid as shown in FIGS. 5 is a yoke made of a non-laminated magnetic material having a rectangular cross section;
A square hole 12 is bored in the center of the upper frame of the yoke 5. Reference numeral 3 denotes a magnetic plate made of soft magnetic material, such as soft iron, processed into the same shape as the upper frame 13, and an insertion hole 15 communicating with the hole 12 is bored in the center of the magnetic plate 3. . On the other hand, grooves are formed on both sides of the upper surface of the magnetic plate 3 by forging, and a shaded coil 4 made of a highly conductive metal wire such as copper wire is embedded and fixed in this groove by, for example, press-fitting or spot welding. ing. Of course, the corner coil 4 may be constructed by melting a high-conductivity metal brazing material such as silver solder, brass solder, or aluminum solder into the groove. The magnetic plates 3 configured as described above are stacked and fixed on the upper surface of the upper frame 13 of the yoke 5, for example, by welding. The coil 9 wound around the coil bobbin 8 is disposed in the opening 16 of the square-shaped yoke 5. At this time, the flange 18 provided at the upper edge of the central through hole 17 of the coil bobbin 8 is attached to the yoke 5. hole 12
Place it so that it protrudes upward from. 6 is a T-shaped movable iron core formed by laminating silicon steel plates,
The lower vertical piece 10 of the movable iron core 6 is fitted into the central through hole 17 of the coil bobbin 8 from the insertion hole 15 of the magnetic plate 3 so as to be vertically movable, and the lower surfaces of both sides of the upper horizontal piece 11 of the movable iron core 6 are magnetic. It comes into contact with the upper surface of the body plate 3 and is locked. That is, the lower surfaces on both sides of the upper horizontal piece 11 and the magnetic plate 3 form a magnetic pole surface. Note that 20 is a rivet for fixing the silicon steel plates in a stacked state, and 14 is a slit for arranging the coil 9. Therefore, when the coil 9 is energized with the movable core 6 protruding from the yoke 5, two magnetic paths are created on both sides of the lower vertical piece 10, flowing from the lower vertical piece 10 to the upper horizontal piece 11 to the yoke 5. , the lower surfaces on both sides of the upper horizontal piece 11 and the upper surface of the magnetic plate 3 become magnetic pole surfaces, respectively, and the movable iron core 6 becomes the yoke 5.
I am attracted to it and work on the outside. As mentioned above, in this embodiment, the non-stacked yoke 5 and the T-shaped stacked movable core 6 form an AC solenoid, so after operation, the magnetic circuit becomes a closed circuit and the movable core 6 is held. Furthermore, since the yoke 5 is not laminated, it can be manufactured in a small size.The surface area of the yoke 5 in contact with the outside air is sufficiently large compared to the movable core 6, and heat dissipation is good. There are relatively few defects due to non-lamination, and the movable core 6, which has a high magnetic flux density and poor heat dissipation, has a laminated structure, so the efficiency as a whole is good. Furthermore, since the yoke 5 and the integral magnetic plate 3 are welded and fixed to the upper surface of the upper frame 13, the yoke 5 as a whole can be reinforced.

5 to 6 show another embodiment of the present invention, in which a non-laminated yoke 5 is formed in a rectangular shape with a notch 21 at the center of the upper frame 13, and a magnetic The body plates 3 are also formed independently into two pieces, and a corner coil 4 is embedded in each magnetic plate 3, respectively. As in the previous embodiment, the top surface of the upper frame 13 on both sides of the notch 21 and each magnetic plate 3 are formed to have the same shape and are overlapped and welded. In this case, yoke 5
The coil 9 can be installed in the yoke 5 by simply fitting the coil bobbin 8 into the opening 16 from the front or rear of the yoke 5, which simplifies the assembly process. By molding as shown in FIG. 6, mechanical reinforcement and dielectric strength can be improved by the resin layer 22.

Thus, in the present invention, a magnetic plate having substantially the same shape as the magnetic pole face is stacked and fixed on the magnetic pole face of a plunger type electromagnetic yoke or a movable iron core, and a corner coil is buried in a groove provided in the magnetic plate. Therefore, the magnetic plate, yoke, and movable core can be assembled and manufactured as separate parts in separate processes, which simplifies the assembly process of each part. It has the effect of reducing the size of the body, and by simply forging it into a magnetic plate, the groove for embedding the corner coil can be easily and accurately made, and the process from creating the groove to press-fitting the corner coil can be easily made. Continuous machining until fixing is possible, so there is no need to worry about corner coils falling off or
There are no troubles such as breakage, and the cost is low.

[Brief explanation of drawings]

FIGS. 1a and 1b are a sectional view and a perspective view of the main parts of the conventional example,
FIG. 2 is a sectional view of the same as above, FIG. 3 is a sectional view of one embodiment of the present invention, FIG. 4 is an exploded perspective view of the same, FIG. 5 is an exploded perspective view of another embodiment of the same, and FIG. 6 is a cross-sectional view of the same as above, where 1 is an electromagnet, 3 is a magnetic plate, and 4 is a sectional view of the same as above.
5 is a corner coil, 5 is a yoke, and 6 is a movable iron core.

Claims (1)

[Claims] 1. An AC electromagnet in which a magnetic plate having substantially the same shape as the magnetic pole face is stacked and fixed on the magnetic pole face of the yoke or movable iron core of a plunger-type electromagnet, and a shaded coil is embedded in a groove provided in the magnetic plate.