JPH0654735B2 - Electromagnetic device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electromagnet device which is suitable for use in, for example, a latching relay.

BACKGROUND ART FIG. 9 is a perspective view showing the structure of an electromagnet device according to the prior art. The main components of the electromagnet device 1 are a yoke 3 around which an electromagnetic coil 2 is wound, and an armature 4 which is supported so as to be angularly displaceable around an axis indicated by reference symbol S.
The armature 4 includes a bearing member 4c through which the axis S penetrates,
A pair of permanent magnet pieces 4d and 4e fixed to both ends of the bearing member 4c, and a pair of movable pieces 4a fixed to the bearing member 4c and the permanent magnet pieces 4d and 4e. 4b and is formed in a substantially H shape. The inner surfaces of the movable pieces 4a and 4b, which are opposed to each other, are inclined surfaces that open outward in the longitudinal direction of the movable pieces 4a and 4b.
Abutment surfaces a, b, c, d that abut the magnetic poles 3a, 3b of the magnetic poles 3a, 3b are formed by the magnetic poles N, S of the permanent magnet pieces 4d, 4e. Each is magnetized.

In the electromagnet device 1 having such a structure, the relative positional relationship between the yoke 3 and the armature 4 is such that the magnetic pole 3a of the yoke 3 has the contact surface a of the armature 4 as shown in FIG.
It is assumed that the contact surface d is in contact with the magnetic pole 3b on the opposite side. When the electromagnetic coil 2 is energized and the yoke 3 is excited, the electromagnetic force generated between the magnetic poles 3a and 3b of the yoke 3 and the electromagnetic force generated between the contact surfaces a, b, c and d of the armature 4 are mutually reciprocal. By the action, the contact surfaces a and d repel the magnetic poles 3a and 3b of the yoke 3, and the contact surfaces b and c are attracted to the magnetic poles 3a and 3b. Therefore, the armature 4 is angularly displaced in the direction indicated by the arrow R, and the contact surfaces b and c contact the magnetic poles 3a and 3b.

The armature 4 is a pair of permanent magnet pieces 4d and 4e as described above.
Therefore, in the electromagnet device 1 shown in FIG. 9, even when the current flowing through the electromagnetic coil 2 is cut off, the electromagnet device 1 shown in FIG. 9 is attracted by the magnetic force of the permanent magnet pieces 4d, 4e. Keep Next, when an exciting current to be applied to the exciting coil 2 is applied in the opposite direction to the previous direction, the armature 4 is angularly displaced in the opposite direction and maintains its position even after the current is cut off.

FIG. 10 is an enlarged perspective view showing one magnetic pole 3a of the yoke 3 of the electromagnet apparatus 1 according to the prior art shown in FIG. 9 and a part of the vicinity of the contact surface a of the armature 4 facing the magnetic pole 3a. . In FIG. 10, parts corresponding to those in FIG. 9 are designated by the same reference numerals. However, for convenience of description, the magnetic pole 3a and the contact surface a are shown in a separated state. As described above, in the electromagnet device 1 according to the prior art, both the yoke 3 and the armature 4 are formed of a rigid body, and therefore, during the operation,
That is, the armature 4 in the direction indicated by the arrow L in FIG.
Of the magnetic pole 3a of the yoke 3 due to the angular displacement of the
When abutting against, a collision noise is generated. In order to reduce the collision noise and reduce the noise, the prior art proposes a method of interposing a cushioning material between the yoke and the armature.

FIG. 11 shows one magnetic pole 3 of the yoke 3 in the prior art.
2 is a plan view showing a and a vicinity of an abutting surface a of the armature 4 facing the a. In FIG. 11, FIG. 9 and FIG.
The same reference numerals are attached to the portions corresponding to the drawings. In the prior art shown here, an elastic piece 5 such as rubber is attached to a portion of the magnetic pole 3a of the yoke 3 that faces the contact surface a of the armature 4 to function as a cushioning material. This is to reduce the collision noise.

However, in such a method according to the prior art, the thickness of the elastic piece 5 must be increased in order to reduce noise,
Then, when the armature 4 is attracted to the yoke 3, the suction force is reduced by the thickness of the elastic piece 5 interposed therebetween,
Further, there arises a problem that the displacement amount of the armature 4 is insufficient by the amount corresponding to the thickness of the elastic piece 5.

FIG. 12 is a graph showing operating characteristics of the electromagnet device 1 according to the prior art shown in FIG. The description will be made with reference to the ninth drawing as well. The horizontal axis represents the displacement amount x from one side of the armature 4 to the other, a so-called stroke, and the vertical axis represents the suction force F. In the prior art, as shown in FIG. 11, since the elastic piece 5 is attached to the magnetic pole 3a, the actual stroke D is the stroke Ds obtained by subtracting twice the thickness d of the elastic piece 5.

Referring to FIG. 12, assuming that the armature 4 is now in the reset position, and when an exciting current in the set direction is supplied to the electromagnetic coil 2, the attractive force F moves from point A to point B, and the armature 4 Angular displacement in the direction of arrow R around the axis S shown in FIG. 9 causes the contact surfaces a and d of the armature 4 to separate, and the suction force F rises along the line p1 to the point C in FIG. Then, the suction force F2 is obtained. In this state, the electromagnet device 1 is in the set state, but what should originally move to the point C'stops at the point C because of the thickness d of the elastic material 5, so that the attraction force F1 to be obtained is The difference f1 is subtracted, the suction force is reduced, and the displacement amount is also reduced from D to Ds.

When the set excitation current is cut off after entering the set state,
Since the attraction force depends only on the permanent magnets 4d and 4e, the attraction force drops to the attraction force F3 at point G, and the attracted state is continuously maintained. Next, when a reset excitation current in the opposite direction to the set excitation current is applied, the attractive force F decreases from point G to point H,
After that, the reset state of the point A is reached by following the direction indicated by the line p2. At this time, as in the case of the set state, the suction force f2 is subtracted.

Line p3, which is carved between line p1 and line p2
Represents the attractive force in the non-excited state of only the permanent magnets 4d and 4e.

In the electromagnet device 1 according to the objective prior art, as described above, when the armature 4 comes into contact with the end faces of the magnetic poles 3a and 3b of the yoke 3, a collision sound is emitted. Therefore, when the electromagnetic relay 1a using the same is installed in a household electric appliance, an automobile, or the like, the collision sound becomes extremely unfavorable. Therefore, noise reduction is achieved by a method of interposing an elastic body between the armature 4 and the yoke 3 as described above. However, in such a method, as described above, a magnetic air gap is generated between the yoke 3 and the armature 4, and the attraction force is reduced or the armature 4 is damaged.
The amount of displacement of the and the malfunction occur.

Therefore, an object of the present invention is to solve the above-mentioned technical problems and provide an electromagnet device which prevents impact noise at the time of abutment of an armature without reducing both the attraction force and the displacement amount. It is to be.

Embodiment FIG. 1 is a perspective view of an electromagnet device according to an embodiment of the present invention. In FIG. 1, parts corresponding to those in FIG. 9 are designated by the same reference numerals. A feature of the present invention is that a pair of magnetic fluid sac is obtained by coating a thin film of liquid or semi-solid containing magnetic powder on the contact surfaces of the magnetic poles 3a and 3b at both ends of the yoke 3 with the armature 4. 5a and 5b (referred to as reference numeral 5 when collectively referred to) are fixed, which will be described below.

FIG. 2 is a plan view of the vicinity of one magnetic pole 3a of the yoke 3 of this embodiment. For convenience of description, a cross section is shown in the portion of the magnetic pole 3a. FIG. 2 shows a state where the yoke 3 is excited and the armature 4 is angularly displaced in the direction indicated by the arrow L.

A recess 3c is formed at a position of the magnetic pole 3a facing the contact surface a of the movable piece 4a, and a magnetic fluid bladder 5a is fixed by covering the recess 3c by a method such as adhesion. Further, the other magnetic pole (indicated by reference numeral 3b in FIG. 1) of the yoke 3 (not shown) on the right side in FIG.
(indicated by b) is fixed.

FIG. 3 is a perspective view of the magnetic fluid bladder 5 of one embodiment of the present invention, and FIG. 4 is a sectional view thereof. Referring to FIG. 3 and FIG. 4, the magnetic fluid bladder 5 has a thickness of 20 μm to 30 μ, for example.
thin film 6a, 6b realized by a polyester film of m
(Referred to as reference numeral 6 when collectively referred to) are stacked vertically, and a magnetic fluid 7 in which magnetic powder is mixed in a liquid is injected into the thin film to form a hemispherical convex portion Q, and then the thin film 6 is removed. It is created by sealing it by thermocompression bonding. The magnetic fluid 7 is
It may be manufactured by mixing magnetic powder into a flexible semi-solid substance.

5 (1) to 5 (3) are plan views showing the operation of this embodiment. For convenience of description, one magnetic pole 3 of the yoke 3
The vicinity of a is shown in a plan view, and the magnetic pole 3a is shown in a cross section.

FIG. 5 (1) shows a state where the yoke 3 is not excited,
The contact surface a of one movable piece 4a of the armature 4 is the magnetic pole 3a.
Is facing. In this state, the contact surface a of the movable piece 4a
Is not in contact with the magnetic fluid bladder 5a fixed to the magnetic pole 3a.

FIG. 5 (2) shows a state in which the yoke 3 is excited, the movable piece 4a of the armature 4 is magnetically attracted to the yoke 3, and is angularly displaced in the direction indicated by the arrow L. The contact surface a is the magnetic fluid bag 5.
It comes into contact with a and is further pressed downward in FIG. 5 (2). The magnetic fluid bladder 5a is deformed, and the magnetic fluid 7 inside moves toward the recess 3c provided in the magnetic pole 3a through the thin film 6. Therefore, with the movable piece 4a of Amatya 4,
The collision energy when the yoke 3 contacts the magnetic pole 3a is absorbed by the movement of the magnetic fluid 7 in the magnetic fluid bladder 5a, and the collision noise between the rigid bodies as described in the section of the background art is not generated.

FIG. 5 (3) shows a state in which the angular displacement of the movable piece 4a of the armature 4 is further advanced. The magnetic fluid bladder 5a is further pressed and fitted into the recess 3c, and the magnetic pole 3a of the yoke 3 is inserted.
Then, only the thin film 6 of the magnetic fluid bladder 5a is interposed between the contact surfaces a of the movable piece 4a of the armature 4, and the magnetic fluid 7 fills the recess 3c through the thin film 6. Therefore, in the state shown in FIG. 5 (3), the magnetic fluid bladder 5a
Forms a part of the magnetic path of the yoke 3 and does not increase the magnetic resistance of the magnetic circuit Φ formed by the yoke 3 and the armature 4. Therefore, after the state of FIG. 5 (3), a sufficient suction force acts between the yoke 3 and the armature 4, and the reduction of the suction force as described in the background art section is prevented.

FIG. 6 is a plan view of the vicinity of one magnetic pole 3a of the yoke 3 of another embodiment of the present invention. FIG. 6 is similar to FIG.
Corresponding parts are designated by the same reference numerals. In this embodiment, it should be noted that the magnetic fluid bladder 5 has a capsule shape having hemispherical convex surfaces Q1 and Q2 at both ends as shown in FIG.

Referring to FIG. 7, the pair of thin films 6a and 6b are made of, for example, a polyester film having a thickness of 20 μm to 30 μm in the same size and size, and the pleated portion 6c is joined by thermocompression bonding, and the inside is magnetic. The fluid 7 is enclosed. Magnetic fluid bag 5
Of the yoke 3 except the convex surfaces Q1 and Q2 at both ends.
The magnetic pole 3a is formed to have a thickness substantially equal to that of the magnetic pole 3a.

Referring again to FIG. 6, one magnetic fluid bladder 5a has a fitting hole h formed in the thickness direction of one magnetic pole 3a of the yoke 3.
After the convex surfaces Q1 and Q2 are pulled out at equal heights on both sides of the magnetic pole 3a, they are fixed to the magnetic pole 3a with an adhesive or the like. The other magnetic pole (indicated by reference numeral 3b in FIG. 1) of the yoke 3 (not shown) on the right side of FIG. 6 is provided with another fitting hole h, and the other magnetic fluid bladder (first (Indicated by reference numeral 5b in the figure) is fitted and fixed.

FIG. 6 shows a state in which the yoke 3 is excited and the armature 4 is angularly displaced in the direction of the arrow L. For convenience of explanation, the fitting hole h is shown in cross section. The contact surface a of the movable piece 4a contacts one convex surface Q1 of the facing magnetic fluid bladder 5a, and the magnetic fluid 7 enclosed in the magnetic fluid bladder moves in the direction of the opposite convex surface Q2, and the yoke 3 A magnetic circuit Φ is formed between the magnetic pole 3a and the movable piece 4a through the magnetic fluid bladder 5a, and the thin film 6 is only present between the magnetic pole 3a of the yoke 3 and the movable piece 4a of the armature 4. The magnetic resistance of the magnetic circuit Ф does not increase, as described later,
The magnetic attraction force between the movable piece 4a of the armature 4 and the magnetic pole 3a-movable piece 4a does not decrease.

8 (1) to 3 (3) are plan views showing the operation of this embodiment. FIG. 8 shows the vicinity of one magnetic pole 3a of the yoke 3 in a plan view, and for convenience of explanation, the magnetic fluid bladder 5a is shown in a cross section.

FIG. 8 (1) shows a state where the yoke 3 is not excited,
The contact surface a of one movable piece 4a of the armature 4 is the magnetic pole 3a.
Is facing. In this state, the contact surface a of the movable piece 4a
Is not in contact with one convex surface Q1 of the magnetic fluid bladder 5a fixed to the magnetic pole 3a.

FIG. 8 (2) shows a state in which the yoke 3 is excited, the movable piece 4a of the armature 4 is excited and attracted by the yoke 3, and is angularly displaced in the direction indicated by the arrow L. The contact surface a is the magnetic fluid bag 5.
It comes into contact with the convex surface Q1 of a, and further, this is shown in FIG.
Press down. Therefore, the magnetic fluid 7 inside the magnetic fluid bladder 5a moves in the direction of the convex surface Q2 on the opposite side. Therefore, the movable piece 4a of the armature 4 and the magnetic pole 3a of the yoke 3
The collision energy at the time of contact with is absorbed by the movement of the magnetic fluid 7 in the magnetic fluid bladder 5a, and the collision noises of rigidity described above in the background art are not generated.

FIG. 8 (3) shows a state in which the angular displacement of the movable piece 4a of the armature 4 is further advanced. The convex surface Q1 of the magnetic fluid bladder 5a
Is further pressed to move the magnetic pole 3a of the yoke 3 and the movable piece 4
The thin film 6 of the magnetic fluid bladder 5a is only interposed between the contact surfaces a of a. Therefore, the magnetic fluid 7 is buried in the fitting hole h via the thin film 6. Therefore, in the state shown in FIG. 8 (3), the magnetic fluid bladder 5a forms the magnetic path of the yoke 3 and does not increase the magnetic resistance in the magnetic circuit Φ formed by the yoke 3 and the armature 4. . Therefore, after the state of FIG. 8 (3), the yoke 3 and the armature 4 are
A sufficient suction force works in between, and the reduction in suction force as described in the background art section is prevented.

Further, since only a thin film is interposed between the yoke and the armature after the operation, as described in the background art section, the displacement amount of the armature is reduced due to the interposition of the thickness of the cushioning material, and any trouble is solved. It

Although the magnetic fluid bladder 5 is fixed to the magnetic poles 3a and 3b side of the yoke 3 in the above-described two embodiments, it may be provided to the armature 4 side. Further, although all of these embodiments have described the electromagnet device having a permanent magnet piece and capable of performing a latching operation, the present invention is not limited to this, and it goes without saying that the present invention can also be applied to an electromagnet device having no permanent magnet piece. Yes.

As described above, in the electromagnet device according to the present invention, the liquid or semi-solid coated with the thin film and mixed with the magnetic powder is fixed to the end surface of at least one of the yoke and the armature. Thus, during operation, the collision energy when the armature abuts the yoke is absorbed by the moving deformation of the magnetic liquid or semi-solid,
Noise during operation is reduced.

Also, the liquid or semi-solid forms a part of the magnetic circuit of the electromagnet device, and only the thin film is interposed between the yoke and the armature after the contact between them, so that the magnetic attraction force is reduced. And an electromagnet device with improved efficiency and low noise is realized.

[Brief description of drawings]

FIG. 1 is a perspective view of an electromagnet device according to an embodiment of the present invention, and FIG.
FIG. 3 is a plan view in the vicinity of one of the magnetic poles of the yoke, FIG. 3 is a perspective view of a magnetic fluid bladder 5 according to an embodiment of the present invention, FIG. 4 is its sectional view, and FIG. 5 is an operation of this embodiment. 6 is a plan view showing
FIG. 7 is a plan view showing the vicinity of one magnetic pole of a yoke of another embodiment of the present invention, FIG. 7 is a sectional view of a magnetic fluid bladder of another embodiment of the present invention, and FIG. FIG. 9 is a plan view showing the operation of another embodiment, FIG. 9 is a perspective view showing the structure of a prior art electromagnet device, and FIG. 10 is an enlarged perspective view of a part of the prior art electromagnet device. FIG. 12 is a plan view showing the vicinity of the contact surface of the armature and the yoke in the prior art, and FIG. 12 is a graph showing the operating characteristics of the prior art. 1 ... electromagnetic device, 3 ... yoke, 3a ... magnetic pole, 4 ...
... Amatya, 4d, 4q ... Permanent magnet pieces, 5, 5a, 5
b ... Magnetic fluid bag, 6 ... Thin film, 7 ... Magnetic fluid, φ ...
… Magnetic circuit

Claims (1)

[Claims] 1. An electromagnet device comprising: a yoke around which an electromagnetic coil is wound; and an armature having an end face that comes into contact with and separates from the end face of the yoke by excitation or demagnetization of the electromagnetic coil. An electromagnet device characterized in that a liquid or semi-solid coated with a thin film and mixed with magnetic powder is fixed to at least one of the end faces.