JPS59737Y2 - electromagnet device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnet device, particularly an electromagnet device for driving a switching device such as a high-voltage electromagnetic contactor.

Fig. 1 is a perspective view of a switchgear equipped with an electromagnet device, and Fig. 2 is a front view showing the configuration of the electromagnet device. 2
is an electromagnetic device that drives the switchgear, 3 is an auxiliary contact part, 4 is
a, 4b are mounting plates that support the opening/closing device 1 and the electromagnet device 2, 5 to 12 are parts that constitute the electromagnet device 2, and 5 to 7 are parts that constitute the drive part of the electromagnet device 2, and 5 is a fixed part. An iron core, 6 is an electromagnetic coil wound around the fixed iron core 5, 7 is a yoke that supports the fixed iron core 5 and forms a magnetic circuit, and 8 is a movable part to which a movable contact (not shown) of the switchgear 1 is attached. A shaft 9 rotates around a movable shaft 8 as a fulcrum, and a movable core 10 is attracted to the fixed core 5 by the bias of the electromagnetic coil 6.
1 is a trip spring that separates the movable core 9 from the fixed core 5 by deenergizing the electromagnetic coil; 11 is a stop plate that stops the movable core 9 at a predetermined position; and 12 is a fixed core 5 of the movable core 9.
A non-magnetic plate, such as a stainless steel plate, is attached to the contact part with the fixed iron core 5 due to the residual magnetism when the electromagnetic coil 6 is deenergized.
This prevents adhesion between the movable iron core 9 and the movable iron core 9.

Also, when the electromagnetic coil 6 is energized, the fixed iron core 5, the yoke 7
, a magnetic circuit of the movable core 9 and the fixed core 5 is formed, and the movable core 9 is attracted to the fixed core 5. However, since the mounting plate 4a is formed of a steel plate, the fixed core is connected in parallel to the above magnetic circuit. 5, yoke 7, mounting plate 4a, stop plate 11. Movable iron core 9
, since the magnetic circuit of the fixed iron core 5 is formed, the stop plate 11
A magnetic attraction force is generated between the movable iron core 9 and the movable iron core 9, and there is a possibility that the movable iron core 9 may malfunction.

Therefore, in the prior art, a non-magnetic material such as stainless steel was used for the stop plate 11, but this had the disadvantage of increasing the cost.

This invention aims to improve the above-mentioned drawbacks.

An embodiment of this invention will be described below with reference to FIGS. 3 to 6.

In the figure, the same reference numerals as in FIG. 2 indicate the same or equivalent parts, 13 is a stop plate made of steel plate, 14 is a non-magnetic plate attached to the contact part of the movable iron core 9 with the stop plate 13, for example, the thickness is 0.
．． It is a stainless steel plate of 5-1, Q mm.

FIG. 4 shows the state in which the nonmagnetic plates 12, 14 are fixed to the movable iron core 9 with screws 15 and nuts 16, and the assembly time is not particularly increased compared to the conventional one.

FIG. 5 shows a perspective view of the main parts of the movable iron core 9 equipped with the non-magnetic plate 12, and FIG. 6 shows a perspective view of the stop plate 13.

By configuring as described above, it is possible to prevent an attraction phenomenon between the movable iron core 9 and the stop plate 13 when the electromagnetic coil 6 is energized.

Furthermore, by making the stop plate 13 made of a steel plate, the magnetic resistance of the parallel magnetic circuit passing through the mounting plate 4a is reduced, and the amount of magnetic flux that attracts the movable iron core 9 is increased, compared to the conventional one made of a non-magnetic material. Therefore, the attraction characteristics of the electromagnet device can be improved.

That is, in the conventional one, the stop plate 13 was made of a non-magnetic material, so the parallel magnetic circuit passing through the mounting plate 4a as shown in FIG.
It is formed by the air gap a, the movable iron core 9, the non-magnetic plate 12, and the fixed iron core 5, and because there are the air gaps a and the air gap 2 in the parallel magnetic circuit, the magnetic resistance is large, and the fixed iron core 5 shown in FIG.
The amount of parallel magnetic flux added to the main magnetic flux of the main circuit composed of the yoke 7, the air gap C1 movable core 9, the non-magnetic plate 12, and the fixed core 5 was small, and the attraction characteristics were not necessarily sufficient.

In this device, the stop plate 13 is made of steel plate, so as shown in FIG.
, non-magnetic plate 14, movable iron core 9, non-magnetic plate 12, air gap b,
Since it is formed by the fixed iron core 5 and there is no air gap a in the parallel magnetic circuit, the magnetic resistance is significantly reduced, and the attraction characteristics are improved by increasing the amount of parallel magnetic flux added to the main magnetic flux.

In addition, the stop plate 13. Non-magnetic plate 14. A magnetic attraction force is generated between the stop plate 13 and the movable iron core 9 due to the parallel magnetic flux passing through the movable iron core 9. However, by interposing the non-magnetic plate 14 between the movable iron core 9 and the stop plate 13, the movable iron core The magnetic attraction force generated between the fixed iron core 5 and the stop plate 13 is caused by the main magnetic flux.
Since the magnetic attraction force between the movable iron core 9 and the movable iron core 9 can be made smaller than that between the movable iron core 9 and the movable iron core 9, the movable iron core 9 will not be attracted to the stop plate 13.

Therefore, due to the bias of the fixed iron core 5, the movable iron core 9
However, as is well known, the magnetic attraction force generated between the magnetic poles is proportional to the magnetic flux density and inversely proportional to the square of the distance between the poles. The magnetic attraction between the plates 13 is rapidly reduced, and the increased amount of parallel magnetic flux improves the operating characteristics.

In the above embodiment, the non-magnetic plates 12 and 14 are attached to the contact portions of the movable iron core 9 with the fixed iron core 5 and the stop plate 13, but they may also be attached to the fixed iron core 5 and the stop plate 13. The non-magnetic plates 12, 14 may be made of synthetic resin as long as they have a sufficient mechanical life.

As described above, according to this invention, the stop plate does not need to be made of an expensive non-magnetic material, and malfunctions of the movable core can be prevented by using an inexpensive material.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a switchgear equipped with an electromagnet device, Fig. 2 is a front view showing the configuration of a conventional electromagnet device, and Figs. 3 to 6
The figures show one embodiment of this invention; Fig. 3 is a front view showing the configuration of the device, Fig. 4 is an explanatory diagram showing the state in which a non-magnetic plate is attached to the movable iron core, and Fig. 5 is an illustration of the movable iron core. FIG. 6 is a perspective view of the stop plate, and FIGS. 7 and 8 are left side views showing the configurations of the parallel magnetic circuits of the conventional device and the device according to this invention. In the figures, the same reference numerals indicate the same or corresponding parts, 5
1 is a fixed core, 6 is an electromagnetic coil, 8 is a movable shaft, 9 is a movable core, and 12.14 is a nonmagnetic plate.

Claims (1)

[Scope of utility model registration request] A drive unit supported by a mounting plate made of a magnetic material and consisting of a fixed core, an electromagnetic coil, and a yoke; a movable iron core that is separated from the fixed iron core when the electromagnetic coil is deenergized; and a stop plate that is made of a magnetic material and is supported by the mounting plate and that stops the movable iron core at a stop position when the movable iron core is separated from the fixed iron core. Equipped with
An electromagnet device in which the movable iron core is brought into contact with the fixed iron core and the stop plate via a non-magnetic plate.