JPH0346484Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to an electromagnetic device used for opening and closing contacts of a polarized relay.

[Background technology]

There are many different types of electromagnetic devices. Among them, two pieces of magnetic material sandwich a permanent magnet from both ends in the direction of magnetization in the middle part of each,
A permanent magnet block in which both ends of one magnetic material piece and both ends of the other magnetic material piece face each other, and a rod-shaped iron core with its ends exposed through the holes of the fixed coil frame from both ends of the coil frame. The permanent magnet block and the electromagnetic block are inserted in such a manner that both ends of the iron core are inserted into two gaps formed by both ends of the two magnetic pieces. There is an electromagnet device in which the iron core rotates in forward and reverse directions about a rotation center within a coil frame. Conventionally, the basic structure of this electromagnet device has been a latching type, but in order to make it into a single stable type, two pieces of different thickness were attached to both ends of the magnetic material piece where the iron core rotates in the forward and reverse directions. Magnetic shielding plates were attached by welding, etc. This has led to an increase in the number of parts and manufacturing man-hours, leading to an increase in costs.

[Purpose of invention]

In view of the above circumstances, the object of this invention is to provide a single-stable electromagnet device that has a small number of parts and requires less manufacturing man-hours.

[Disclosure of invention]

In order to achieve the above object, this invention consists of two pieces of magnetic material sandwiching a permanent magnet from both ends in the direction of magnetization in the middle part of each, and the both ends of one magnetic piece and the other magnetic piece. and an electromagnetic block in which a rod-shaped iron core is passed through a hole in a fixed coil frame with both ends thereof exposed from both ends of the coil frame. , a permanent magnet block and an electromagnet block are combined so that both ends of the iron core are inserted into two gaps formed by both ends of the two magnetic pieces, and the iron core is rotated within the coil frame. An electromagnet device that rotates in forward and reverse directions about a center of rotation, wherein the center of rotation of the iron core is offset from two dividing lines of the four ends of the two magnetic pieces. The gist is the device.

This will be explained in detail below based on the drawings showing one embodiment thereof.

As shown in FIGS. 1 and 2a and 2b, this electromagnetic device includes a permanent magnet block 1 and an electromagnet block 2. Permanent magnet block 1 is
The two U-shaped magnetic pieces 3 and 4 sandwich the permanent magnet 5 from both ends in the direction of magnetization. The permanent magnet 5 is sandwiched between the magnetic pieces 3 and 4 at an intermediate portion. Both ends 3a and 3b of one magnetic piece 3 and both ends 4a and 4b of the other magnetic piece 4 are facing each other.

The electromagnetic block 2 has a coil frame 6 and a rod-shaped iron core 7. A coil 8 is wound around the coil frame 6, and a hole 6a is formed in the coil frame 6. A rod-shaped iron core 7 is inserted into the hole 6a at both ends 7a and 7b.
The coil is passed through so that it appears from both ends of the coil frame. When a current is passed through the coil 8, the end 7 of the iron core
The end portion a and the end portion 7b have different magnetic properties. Projections 9 and 10 are provided on the wall of the hole 6a. The protrusions 9 and 10 are offset from the center position of the coil frame 6 to one end side of the coil frame 6. Moreover, the protrusion 10 is higher than the protrusion 9. The iron core 7 passed through the hole 6a of the coil frame 6 is
It is sandwiched between the protrusions 9 and 10 so that it can rotate in forward and reverse directions. That is, the iron core 7 is configured to rotate in forward and reverse directions with a rotation center that is offset from the center position of the coil frame 6.

Permanent magnet block 1 and electromagnet block 2 are
Both ends 3a, 3b, 4 of the two magnetic pieces 3, 4
Both ends 7 of the iron core are placed in the two gaps created by a and 4b.
a, 7b are inserted, respectively, and the two magnetic pieces are combined so that the center positions 12 of the four ends 3a, 3b, 4a, 4b and the center position of the coil frame 6 are aligned. As mentioned above, the rotation center 11 of the iron core is offset from the center position of the coil frame 6, but when combined with the permanent magnet block 1, the four ends 3a of the two magnetic pieces 3b, 4a, and 4b are deviated from the center position 12 so as to be closest to the end 3a compared to the other three ends. That is, the rotation center 11 of the iron core is shifted from the two dividing lines L and M of the four ends of the two magnetic material pieces. This electromagnet device is constructed as described above and operates as follows.

When a current is applied to the coil 8 from the state shown in FIG. 2a, and the end 7a of the iron core is magnetized to the north pole and the end 7b of the iron core is magnetized to the south pole, the iron core 7 is magnetized by different polarity attraction and same polarity repulsion. It rotates around the rotation center 11 in the direction of arrow A in the figure, and reaches the state shown in FIG. 2b.
As shown in FIG. 2b, after the core 7 has rotated in the direction of arrow A, the end 7b of the core comes into contact with the end 3b of the magnetic piece. However, the end 7 of the iron core
In a, the rotation center 11 of the iron core is two magnetic pieces 3,
Since the four end portions 3a, 3b, 4a, 4b of 4 are shifted from the two dividing lines L and M, they do not come into contact with the end portion 4a of the magnetic piece. That is, after the iron core 7 rotates in the direction of arrow A, a gap 13 is formed between the end 7a of the iron core and the end 4a of the magnetic piece.
When the current to the coil 8 is cut off from the state shown in FIG. 2b, the permanent magnet 5 causes the iron core 7 to
In the figure, a suction force that attempts to rotate it in the direction of arrow A and a suction force that tries to rotate it in the direction of arrow B in the figure are applied. However, since a gap 13 is formed between the end 7a of the iron core and the end 4a of the magnetic material piece, the magnetic resistance between them is large, and the attraction that attempts to rotate the iron core in the direction of arrow A occurs. The force is weaker than the suction force that attempts to rotate the iron core in the direction of arrow B. As a result, the iron core rotates in the direction of arrow B, resulting in the state shown in FIG. 2a. As seen in the above operation description, this electromagnet device is a single stable electromagnet device that is stable in one direction when the coil is not energized (non-excited state).

As seen above, a single stable electromagnetic device can be easily constructed by shifting the center of rotation of the iron core from the two dividing lines of the four ends of the two magnetic pieces. .

The electromagnet device according to this invention is not limited to the above embodiment. As in the above embodiment, the iron core may be rotated by being sandwiched between the protrusions, or
A shaft formed on the wall surface of a hole in the coil frame may be passed through the center of rotation of the iron core, so that the core can be rotated around this shaft. In order to determine the rotational center position of the iron core, a recess into which the protrusion is fitted may be provided at a position in contact with the protrusion of the iron core.

[Effect of idea]

As described above, the electromagnetic device according to this invention is of a single stable type by shifting the center of rotation of the iron core from the two dividing lines of the four ends of the two magnetic pieces. Therefore, unlike the conventional single stable type electromagnet device, there is no need for a magnetic shield plate, and there is no need to attach the magnetic shield plate to both ends of the magnetic material piece by welding or the like. Therefore, it is possible to obtain a single stable type electromagnetic device that has a small number of parts and requires no manufacturing man-hours.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the electromagnet device according to this invention, with a part of the coil frame cut away, and FIGS. 2a and 2b are explanatory views of the same operation. 1...Permanent magnet block, 2...Electromagnetic block, 3, 4...Magnetic piece, 3a, 3b, 4a, 4
b... End of magnetic piece, 5... Permanent magnet, 6...
Coil frame, 6a...Coil frame hole, 7...Iron core,
7a, 7b... end of iron core, 9, 10... protrusion,
11... Center of rotation, L, M... Two bifurcating lines of the four ends of the magnetic piece.

Claims (1)

[Claims for Utility Model Registration] (1) Two pieces of magnetic material sandwich a permanent magnet from both ends in the direction of magnetization in the middle part of each, and both ends of one piece of magnetic material and the magnetic material of the other A permanent magnet block in which both ends of the pieces face each other, and an electromagnet block in which a rod-shaped iron core is passed through a hole in a fixed coil frame with both ends thereof exposed from both ends of the coil frame. A permanent magnet block and an electromagnetic block are combined in such a way that both ends of the iron core are inserted into two gaps formed by both ends of the two magnetic pieces, and the iron core is inserted into the coil frame. An electromagnet device that rotates in forward and reverse directions about a rotation center, characterized in that the rotation center of the iron core is offset from two bisecting lines of the four ends of the two magnetic pieces. Electromagnetic device. (2) The electromagnet device according to claim 1, wherein the iron core is sandwiched between protrusions facing each other on the wall of the hole in the coil frame.