JPS6339930Y2 - - 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, plunger type AC electromagnets have a yoke 5' and a T which are laminated with silicon steel plates in order to reduce eddy current loss, as shown in Figure 1a and b, for medium and large plunger type AC electromagnets.
A type movable iron core 6 is used. In addition, in general, in order to prevent buzzing noise when energized, AC electromagnets must be provided with a shaded coil 4 on either the magnetic pole surface of the yoke 5' or the movable iron core 6. A groove is provided, and a shaded coil 4 made of a copper-based or aluminum-based metal material is fixed in this groove by press-fitting, fitting, welding, brazing, or the like. On the other hand, as a relatively small device in which eddy current loss does not pose much of a problem, a device using an I-type movable iron core 6' as shown in FIG. 2 is also available. Of course, the shaded coil 4 is also used for this AC electromagnet. By energizing the coil 9, the yokes 5', 5'' are magnetized, and the movable iron cores 6, 6' are attracted to perform work on the outside. Although it can provide a stroke and a large output, the magnetic pole surface becomes rusty due to long-term use.
This rust has the disadvantage that it generates a hum during operation, and furthermore, the magnetic pole surfaces of the yokes 5', 5'' and the movable iron cores 6, 6' are deformed and worn due to impact due to repeated operations. In other words, an AC electromagnet 1 using a T-shaped movable iron core 6
In this case, as shown in Fig. 3, the magnetic pole surface of the yoke 5' to which the shaded coil 4 is fixed expands, making the shaded coil 4 easy to break, and furthermore, due to deformation due to depression of the magnetic pole surface, as shown in Fig. 1a. There is a problem in that the gap d, which prevents the suction force due to the residual suction force and facilitates the return operation, becomes smaller, and a return operation failure occurs due to an increase in the residual suction force. In addition, in the case of the AC electromagnet 1 using an I-type movable core 6', the magnetic pole surface provided at the lower end of the movable core 6' expands, causing the movable core 6' to become stuck to the coil bobbin 8 and once unable to return. There was a problem. In order to solve this problem, methods have been proposed, such as plating the magnetic pole surface or surface hardening treatment such as carbonization or nitriding, but the former has the problem of peeling of the plating, and the latter In this case, there is a problem of deterioration of magnetic properties, and this cannot be said to be a fundamental solution.

In view of the above points, the present invention is an AC electromagnet that solves the problem of deformation and wear due to impacts on the magnetic pole surface, even if it is a plunger type electromagnet with a magnetic pole surface that does not easily rust and has a relatively large attractive force. The purpose is to provide

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. Reference numeral 5 denotes a yoke made of a non-laminated magnetic material with a substantially square-shaped cross section, and a square hole 12 is provided in the center of the upper frame of the yoke 5.
is perforated. 3 is an upper frame 1 made of magnetic stainless steel, which has excellent magnetic properties and is strong and rust-resistant.
The magnetic plate 3 is a magnetic plate processed into the same shape as the magnetic plate 3, 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 shaded coil 4 may be constructed by melting a highly conductive metal brazing material such as silver solder, brass solder, or aluminum solder into the groove. The magnetic plate 3 configured as described above is attached to the upper frame 13 of the yoke 5.
It is fixed on the top surface of the board by welding, for example. 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. It is arranged so as to protrude upward from the hole 12 of. 6 is a T-shaped movable core formed by laminating silicon steel plates, and the lower vertical piece 10 of this movable core 6 is connected to the magnetic plate 3.
from the insertion hole 15 of the coil bobbin 8 to the center through hole 1 of the coil bobbin 8.
Magnetic plates 2 made of the same material as the magnetic plates 3 processed into the same shape are fixed by welding to the lower surfaces of both sides of the upper horizontal piece 11 of the movable iron core 6 so as to be movable up and down. The lower surface of the body plate 2 abuts and is locked against the upper surface of the magnetic plate 3. That is, the magnetic plate 2 and the magnetic plate 3 on both lower surfaces of the upper horizontal piece 11
and form opposing magnetic pole faces, respectively. Note that the shaded coil 4 may be provided on the magnetic plate 2 on the side of the movable iron core 6, in which 20 is a rivet for fixing the silicon steel plates in a laminated state, and 14 is a slit for disposing the coil 9. Therefore, the movable iron core 6 is connected to the yoke 5.
When the coil 9 is energized in a more protruding state, two magnetic paths are generated 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, and the magnetic plate of the upper horizontal piece 11 The lower surface of magnetic plate 2 and the upper surface of magnetic plate 3 each serve as magnetic pole surfaces, and movable iron core 6 is attracted to yoke 5, and electromagnet 1 performs 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, a magnetic plate 3 made of magnetic stainless steel is mounted on the upper surface of the upper frame 13 integrally with the yoke 5.
Since the magnetic plates 2 made of the same material as the movable iron core 6 are integrally welded to the lower surfaces of both sides of the upper horizontal piece 11, the magnetic plates 2 and 3 will not be deformed or worn out even if the operation is repeated. The shaded coil 4 will not break or become unable to return, and it also has the effect of reinforcing the yoke 5 and the movable iron core 6.

FIG. 6 shows an embodiment in which the magnetic plate 3 is divided, and FIG. 7 shows an embodiment in which a resin layer 22 is formed on the outer periphery of the yoke 5 by molding.

FIG. 8 shows an embodiment using a laminated I-shaped movable core 6, in which the lower end magnetic pole surface of the movable core 6 and the bottom magnetic pole surface of the non-laminated square-shaped yoke 5 are made of magnetic stainless steel. Magnetic plates 2 and 3 are fixed by welding, and a shaded coil 4 is attached to magnetic plate 3. In this embodiment, the movable core 6' does not deform to expand, and the movable core 6 does not get caught on the coil bobbin 8 and become unable to return.

Thus, in the present invention, magnetic plates made of magnetic stainless steel having substantially the same shape as each magnetic pole surface are stacked and fixed on each magnetic pole surface of the yoke of the plunger-type electromagnet and the movable core, and the opposing magnetic plates are fixed to each other. If it is installed on either one of the magnetic plates, the magnetic stainless steel magnetic pole surface will not easily rust even during long-term use, so there will be no rusting due to rust. The magnetic pole surface will not be deformed or worn even when used as a magnetic pole surface, and the shaded coil will not break due to the expansion of the magnetic pole surface or the return operation will not be possible. No trouble will occur due to the increase. In addition, the above effect can be obtained by fixing a magnetic plate made of magnetic stainless steel to the magnetic pole surface of a general yoke and iron core. It has the advantage that it can be applied to any of the cases, and can also be easily applied to small to large AC electromagnets.

[Brief explanation of the drawing]

Figures 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 essential parts of the same as above, Fig. 4 is a sectional view of an embodiment of the present invention, Fig. 5 is an exploded perspective view of the same as above, and Fig. 6 is an alternative to the same as above. FIG. 7 is a sectional view of another embodiment of the same, and FIG. 8 is a sectional view of still another embodiment of the same, wherein 1 is an electromagnet, and 2 and 3 are magnetic bodies. 4 is a shaded coil, 5 is a yoke, and 6 is a movable iron core.

Claims (1)

[Scope of utility model registration request] Magnetic plates made of magnetic stainless steel having approximately the same shape as each magnetic pole plane are stacked and fixed on each magnetic pole surface of the yoke and movable iron core of the plunger-type electromagnet, and either one of the opposing magnetic plates is fixed. An AC electromagnet with a shaded coil embedded in a groove.