JPH0225207Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to an electromagnet device used in a polarized relay or the like.

[Background technology]

Conventional single-stable electromagnetic devices are
The coil had to be excited in a way that interfered with the magnetic flux of the permanent magnet, and the magnetic efficiency was not good. On the other hand, in recent years, small polarized relays are often mounted on electronic circuit boards, etc., and in such cases, leakage magnetic flux from the electromagnetic device used in the polarized relays can have an adverse effect on adjacent electronic components, etc. There is also the problem of providing for.

[Purpose of invention]

In view of the above points, the object of this invention is to provide a single stable type electromagnet device that is thin, has little leakage magnetic flux, and has good magnetic efficiency.

[Disclosure of invention]

In order to achieve the above object, this invention is such that at least one side of a coil wound around a thin iron core is blocked by a yoke that is thicker than the iron core, and this yoke is connected to one end of the iron core. , a U-shaped member is provided at the other end of the iron core, and the end of the yoke facing the U-shaped member is formed to be thinner, and two pieces of magnetic material magnetize the permanent magnet. A permanent magnet block which is sandwiched from both sides in the direction is sandwiched between the opposing magnetic pole parts of the U-shaped member with each end of the two magnetic pieces sandwiching the thin yoke end. Or a magnetic circuit formed when the electromagnetic block is configured to move forward and backward as the excitation state of the coil changes, and when the excitation of the coil is cut off while the permanent magnet block or electromagnetic block is in both states of forward and reverse movement. The gist is an electromagnetic device with different magnetic resistances. This will be explained in detail below based on drawings showing examples thereof.

As shown in FIGS. 1 and 2, this electromagnet device consists of an electromagnet block 1 and a permanent magnet block 2.
It is equipped with The electromagnetic block 1 has a thin iron core 4 around which a coil 3 is wound, and a yoke 5 extending parallel to the iron core 4 is joined to one end of the iron core 4. The yoke 5 is thicker than the iron core 4 and closes one side of the coil 3 to magnetically shield leakage magnetic flux. A U-shaped member 6 made of a soft magnetic material is joined to the end of the iron core 4 facing the end of the yoke 5. The end of the iron core 4 is branched into two parts by this U-shaped member 6 and widened widely. Opposite sides of the U-shaped member 6 become opposing magnetic pole portions 7a and 7b, and one opposing magnetic pole portion 7a is cut off at a portion indicated by a dashed line in the figure, and is shorter than the opposing magnetic pole portion 7b. The end of the yoke 5 facing the U-shaped member 6 is thinner,
The end magnetic pole part 8 is formed. The reason why the end portion of the yoke 5 is thinner is to make it thinner. The opposing magnetic pole parts 7a and 7b of the U-shaped member 6 and the yoke end magnetic pole part 8 have different polarities due to the excitation of the coil 3.

Permanent magnet block 2 has one permanent magnet 9 and 2
It consists of two magnetic pieces 10a, 10b, and the same side ends of the two magnetic pieces 10a, 10b are combined so that the permanent magnet 9 is sandwiched from both sides in the direction of magnetization. The magnetic pieces 10a and 10b are bent in the middle, and when the permanent magnet 9 is sandwiched between them, the distance between the other ends of the magnetic pieces 10a and 10b is larger than the distance between the ends on the same side that sandwich the permanent magnet 9. It's starting to happen. The other ends of the magnetic pieces 10a, 10b form opposing magnetic pole parts 11a, 11b.

Then, the electromagnet block 1 is inserted into the gap created by the opposing magnetic pole parts 11a and 11b of the permanent magnet block 2.
The end magnetic pole part 8 of the permanent magnet block 2 is inserted, and the permanent magnet 9 of the permanent magnet block 2 is sandwiched between the opposing magnetic pole parts 7a and 7b of the U-shaped member 6 of the electromagnet block 1, so that the electromagnet block 1 and the permanent magnet block 2 are combined. has been done.

In this embodiment, the permanent magnet 9 magnetizes the magnetic piece 10a of the permanent magnet block 2 to the north pole and the magnetic piece 10b to the south pole. Further, when the coil 4 is excited, the opposing magnetic pole portions 7a and 7b of the electromagnetic block 1 are magnetized to the south pole, and the end magnetic pole portion 8 is magnetized to the north pole.

Now, as shown in FIG. 1, the opposing magnetic pole part 11a of the permanent magnet block 2 is attracted to the end magnetic pole part 8 of the electromagnetic block 1, and the part of the magnetic piece 10b that sandwiches the permanent magnet 9 is attached to the electromagnetic block 1. Suppose that it is attracted to the opposing magnetic pole part 7b of. When the coil 4 is energized and each magnetic pole part of the electromagnetic block 1 is magnetized, the magnetic material pieces of the permanent magnet block 2 repel the same polarity and attract different polarities, so that the permanent magnet block 2 is connected to the opposing magnetic pole part 7a of the electromagnetic block 1. The opposing magnetic pole part 11b of the permanent magnet block 2 is attracted to the end magnetic pole part 8 of the electromagnetic block 1, and the magnetic piece 1
The portion of the magnet 0a sandwiching the permanent magnet 9 is attracted to the opposing magnetic pole portion 7a of the electromagnetic block 1.

Here, the magnetic circuit formed when the excitation of the coil is cut off in the state shown in FIG. Magnetic pole part 8 → Yoke 5 → Iron core 4 → Opposing magnetic pole part 7b of U-shaped member 6 →
The part of the magnetic piece 10b that sandwiches the permanent magnet → the S pole of the permanent magnet 9 → the N pole of the permanent magnet 9. The magnetic resistance of the magnetic circuit (hereinafter referred to as magnetic circuit A) and the magnetism formed when the coil 4 is energized and the permanent magnet block 2 is moved to the opposing magnetic pole part 7a side of the electromagnetic block 1 and the excitation of the coil is cut off. Circuit (N pole of permanent magnet 9 → magnetic piece 7a → iron core 4 → yoke 5 →
End magnetic pole part 8 of electromagnet block 1 → magnetic piece 10
Opposed magnetic pole portion 11b of b→portion of magnetic piece 10b sandwiching the permanent magnet→S pole of permanent magnet 9→N pole of permanent magnet 9. Let's compare the magnetic resistance of the magnetic circuit (hereinafter referred to as magnetic circuit B). In this electromagnet device, one opposing magnetic pole part 7a of the U-shaped member 6 of the electromagnet block 1 is notched, and a magnetic piece 10a of the permanent magnet block 2 is cut out.
Since the contact area between the opposite magnetic pole part 7b and the magnetic piece 10b of the permanent magnet block 2 is smaller than the contact area between the magnetic piece 10b of the permanent magnet block 2, the magnetic piece 1 in the magnetic circuit B
The magnetic resistance from the part sandwiching the permanent magnet 0a to the opposing magnetic pole part 7a of the electromagnetic block 1 is the same as that from the part sandwiching the permanent magnet of the magnetic piece 10b of the magnetic circuit A to the opposing magnetic pole part 7b of the electromagnetic block 1. It is larger than the magnetic resistance of . Since the magnetic resistances of the magnetic circuits A and B are equal in the other parts, the magnetic resistance of the magnetic circuit B is larger than that of the magnetic circuit A. As a result, when it is de-energized, the permanent magnet block 2
is always stable in a state where the magnetic resistance of the magnetic circuit is small. That is, when the excitation of the coil 4 is cut off from the state where the permanent magnet block 2 is attracted to the facing magnetic pole portion 7a side of the electromagnetic block 1, the permanent magnet block 2
moves toward the opposing magnetic pole portion 7b of the electromagnetic block 1, resulting in the state shown in FIG.

As seen above, the electromagnet device of this embodiment is a single stable electromagnet device that is stable in one direction in a non-excited state by cutting out one opposing magnetic pole part of the U-shaped member. There is.

Instead of cutting out one opposing magnetic pole part of the U-shaped member, the opposing magnetic pole part 11a of the magnetic piece 10a may be cut out, as shown in FIG.

In order to further reduce the leakage magnetic flux, as shown in Fig. 4, both sides of the coil 3 are closed with a yoke 5, and end magnetic pole parts 8, 8 are provided at the ends of the yoke, and these end magnetic pole parts 8, 8 are permanently attached. Magnetic piece 10 of magnet block 2
Each end 11a, 11a, 11b, 1 of a, 10b
They may be sandwiched between 1b. The embodiments shown in FIGS. 1 and 3 do not require a yoke on one side of the core compared to the embodiment shown in FIG. 4, and are therefore smaller in size.

The notch in the opposing magnetic pole part of the U-shaped member or the opposing magnetic pole part of the magnetic piece may be a U-shaped notch 12 or a hole 13, as shown in FIG.

To achieve single stabilization, instead of providing a notch as in the previous embodiment, it is also possible to use the method shown in FIG. 6. As shown in the figure, this electromagnet device consists of a magnetic piece 1 of a permanent magnet block 2.
The thicknesses of 0a and 10b are different, with the magnetic piece 10a being thicker than the magnetic piece 10b. In this way, the permanent magnet block 2 becomes the electromagnet block 1.
When the magnetic body piece 11b of the permanent magnet block 2 and the electromagnet block 1 move toward the opposite magnetic pole part 7b side,
An air gap 14 is formed between the opposing magnetic pole portions 7b, and this air gap 14 causes a difference in magnetic resistance, making it possible to achieve single stability. The electromagnet device of this embodiment is a single stable type electromagnet device that is always stable on the opposing magnetic pole portion 7a side of the electromagnet block 1 in a non-excited state.

There are various other ways to achieve single stabilization, such as providing a piece of non-magnetic material on the inner surface of one of the opposing magnetic poles of the electromagnetic block. Any method may be used as long as it is possible to differentiate the magnetic resistance of the magnetic circuit formed when the magnetic circuit is turned.

The polarity of the permanent magnet may be reversed. Alternatively, the permanent magnet block may be fixed and the electromagnetic block may be moved. In this case, single stabilization may be achieved by making a difference in the magnetic resistance of the magnetic circuit formed when the excitation of the coil is cut off in both states in which the electromagnetic block moves forward and backward.

[Effect of idea]

In the electromagnet device according to this invention, since at least one side of the coil is covered with a yoke that is thicker than the iron core, leakage magnetic flux can be reduced. Further, since the end portion of the yoke is formed to be thin, it is possible to reduce the thickness of the yoke. Furthermore, since the single stable structure is created by creating a difference in the magnetic resistance of the magnetic circuit that is formed when the coil is de-energized in both states in which the permanent magnet block or electromagnetic block moves forward and backward, Unlike stable electromagnet devices, there is no need to excite a coil to interfere with the magnetic flux of a permanent magnet, making it possible to realize a single stable electromagnet device with high magnetic efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the electromagnet device according to this invention, Fig. 2 is an exploded perspective view of the same as above, and Figs. 3 and 4 respectively show another embodiment of the electromagnet device according to this invention. A perspective view showing
FIG. 5 is a perspective view showing another example of the shape of the notch indicated by the dashed-dot line in FIGS. 1 to 4, and FIG. 6 is a front view showing yet another embodiment of the electromagnet device according to the invention. be. 1...Electromagnetic block, 2...Permanent magnet block, 3...Coil, 4...Iron core, 5...Yoke,
6... U-shaped member, 7a, 7b... Opposing magnetic pole part of electromagnetic block, 8... End magnetic pole part, 9... Permanent magnet, 10a, 10b... Magnetic piece, 11a, 1
1b...Opposing magnetic pole part of the permanent magnet block.

Claims (1)

[Claims for Utility Model Registration] (1) At least one side of a coil wound around a thin iron core is blocked by a yoke that is thicker than the iron core, and this yoke is connected to one end of the iron core, A U-shaped member is provided at the other end of the iron core, and the end of the yoke facing the U-shaped member is formed to be thinner, and two pieces of magnetic material direct the permanent magnet in its magnetization direction. A permanent magnet block which is sandwiched from both sides is sandwiched between the opposing magnetic pole parts of the U-shaped member with each end of the two magnetic pieces sandwiching the thin yoke end, and the permanent magnet block or The electromagnetic block is configured to move forward and backward according to changes in the excitation state of the coil, and
An electromagnet device in which the magnetic resistance of the magnetic circuit formed when the excitation of the coil is cut off in both states in which a permanent magnet block or an electromagnet block moves forward and backward is differentiated. (2) The electromagnet device according to claim 1, wherein the difference in magnetic resistance is achieved by providing a notch in one of the opposing magnetic poles of the U-shaped member. (3) Utility model registration claim No. 1 in which the difference in magnetic resistance is achieved by providing a notch in one end of the magnetic material of the permanent magnet block that sandwiches the yoke end of the electromagnetic block. 1
Electromagnetic device as described in section. (4) Creating a difference in magnetic resistance is achieved by making one magnetic piece of the permanent magnet block thicker so that when the permanent magnet block or electromagnetic block moves forward or backward, the thinner side of the magnetic piece becomes thicker. 2. The electromagnet device according to claim 1, wherein the electromagnet device is constructed by not touching the opposing magnetic pole portion of the U-shaped member facing the U-shaped member.