JPH0645138A - Electromagnetic device - Google Patents

Abstract

PURPOSE:To provide the title electromagnet device capable of abating the collision noise of an armature as well as avoiding the deterioration in the suction characteristics. CONSTITUTION:Within the title electromagnet device held between the magnetic pole surface (wide width part) 3c of a fixed iron core 3 and the contacts 7 of an armature 6, the electromagnet is shifted against the holding force of a permanent magnet 8 by the contacts 7 sucked at the magnetic pole surface 3c as well as a magnetic buffer 10 comprising two each of opposing pieces 10c, 10c and a connecting piece 10a not preventing the contact between the contacts 7 and the magnetic pole surface 3c when the magnetic device is shifted is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silent electromagnet device suitable for use in electromagnetic relays and the like.

[0002]

2. Description of the Related Art This type of electromagnet device generally has a structure for reducing a collision noise when an armature of an armature collides with a fixed iron core of a magnetic member serving as a magnetic pole surface. There are the following.

That is, as shown in FIGS. 8 and 9, a coil C is wound and a magnetic member A having a fixed iron core B whose both surfaces are magnetic pole surfaces Ba, Ba and both magnetic pole surfaces Ba, Ba are attracted. An armature D consisting of armatures E, E and a permanent magnet F that separate from each other.
Are used as basic constituent members, and cushioning members G, G such as rubber and resin sheets are attached to both magnetic pole surfaces Ba, Ba. This armature D is attached to a rotatable movable frame H.
H is a yoke that constitutes the magnetic member A together with the fixed iron core B.

FIG. 9 shows the operation of the armature D,
(a) is in the middle of the operation, (b) is one armature E is the pole face
Although it is in a state of being attracted to Ba and colliding, since the buffer member G is interposed between the armature E and the magnetic pole surface Ba, the collision energy is buffered and the collision noise is reduced.

FIG. 10 is a characteristic diagram of the attraction force. The horizontal axis represents the stroke of the armature D, and the vertical axis represents the spring load and the attraction force.
L is a spring load curve, F ₀ is a non-excitation attraction force curve, Fs is a set attraction curve, and Fr is a reset attraction force curve. In FIG. 10, the original full stroke of the armature D is from S ₀ to S ₃ , but the actual full stroke is from S ₁ to S ₂ by attaching the cushioning members G and G.

There is also one in which the above-mentioned cushioning members G, G are leaf springs, which are shown in FIGS. 11 and 12. As is clear from Fig. 12 showing the operation of the armature D, this one also has an armature.
Since the buffer member G is interposed between E and the magnetic pole surface Ba, the collision energy is buffered and the collision noise is reduced.

FIG. 13 is a suction force characteristic diagram similar to that of FIG. 10, and this one also has the original full stroke of the armature D from S ₀ to S ₃ , but with the shock absorbing members G, G attached. Therefore, the actual total stroke is from S ₁ to S ₂ .

[0008]

The electromagnet device described with reference to FIGS. 8 to 10 shows that when the cushioning members G, G are attached, as is clear from the attraction force characteristic diagram, Strokes are reduced compared to Amatya D
Each suction force for holding the is reduced and the spring load is limited. If this is applied to, for example, an electromagnetic relay, the switching capacity will be limited.

Further, in the electromagnet device described with reference to FIGS. 11 to 13, in addition to the problem substantially similar to that described above, the spring load due to the cushioning members G, G increases, so that the spring load is further limited. .

That is, although these are effective in reducing the collision noise of the armature D, the attraction force characteristics of the electromagnet device are reduced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnet device that reduces the collision noise of an armature and does not deteriorate the attractive force characteristics.

[0012]

In order to solve such a problem, an electromagnet device of the present invention is an armature having a magnetic member having a magnetic pole surface and a magnetic member around which a coil is wound and which is attracted to and separated from the magnetic pole surface. And a permanent magnet inserted in a magnetic circuit including a magnetic member and an armature, in an electromagnet device, which is held by the magnetic force of the permanent magnet between the magnetic pole surface and the armature, wherein the armature is A magnetic buffer is provided that is moved by the armature against the holding force of the permanent magnet when attracted to the magnetic pole surface, and that does not obstruct the contact between the armature and the magnetic pole surface when the armature is moved.

[0013] Preferably, the magnetic member has a fixed iron core in which both surfaces are magnetic pole surfaces and a buffer recess having a depth equal to or greater than the thickness of the magnetic buffer is formed on both magnetic pole surfaces. It is configured to be attached to a rotatable movable frame, which is composed of two armatures attracted to and separated from each magnetic pole surface and a permanent magnet interposed therebetween.

[0014]

According to this structure, the armature moves the magnetic buffer held by the magnetic force of the permanent magnet to reduce the operating speed, and thus the collision noise, and the magnetic buffer is moved. At this time, since the contact between the armature and the magnetic pole surface is not hindered, the stroke of the armature is not reduced, and the suction force for holding the armature is not reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. This electromagnet device mainly comprises a magnetic member 1 around which a coil 4 is wound, an armature 6, a permanent magnet 8 and a magnetic buffer 10.

The magnetic member 1 comprises a yoke 2 and a fixed iron core 3. The yoke 2 includes a flat plate-shaped base piece 2a, a fixed piece 2b formed by bending one end thereof at a substantially right angle, and opposite leg pieces 2c, 2c formed by bending both side portions on the other end side at a substantially right angle. Have. Fixed iron core
Numeral 3 is made of a magnetic plate material, and the narrow portion 3a and the wide portion 3c are substantially T
It has a character shape, and the wide portion 3c serves as a magnetic pole surface for an armature described later. The wide width portion (magnetic pole surface) 3c has a buffer body recess 3 formed by cutting both front end sides to a predetermined depth.
d, 3d are formed. A magnetic buffer, which will be described later, is located in the buffer body recesses 3d, 3d.

The coil 4 is wound around the coil frame 5, and the narrow portion 3a of the fixed iron core 3 is inserted into the inner hole 5a of the coil frame 5. Coil frame 5 has collar parts at both ends of the winding drum part with inner hole 5a.
It has 5b and 5c. One of the collars 5b has coil terminals 4a, 4a, 4
A shaft portion 5d is formed on the upper end face of the movable frame, which is a fulcrum of rotation of the movable frame as will be described later, while holding a through.

In the magnetic member 1, the end of the narrow portion 3a of the fixed iron core 3 which is inserted into the inner hole 5a of the coil frame 5 is fixed to the fixing piece 2b of the yoke 2.
It is assembled by fixing to.

The armature 6 has a U-shaped movable frame 9 composed of two armatures 7, 7 and a permanent magnet 8 sandwiched between them.
Held in. The movable frame 9 is made of resin and has a fixed core 3
Has a base portion 9a corresponding to the length of the bearing, a bearing portion 9d fitted to the shaft portion 5d of the coil frame 5 on one end side, a drive portion 9b for driving the contact plate in the middle portion, and an armature 6 on the other end side. Holding part 9c
Is formed. Therefore, the bearing 9d of the movable frame 9
When fitted to the shaft portion 5d of 5, the inner surface of the armature 7, 7 of the armature 6 faces the wide portion (pole surface) 3c of the fixed iron core 3, and the excitation of the coil 4 is controlled to control the armature 7 , 7 is wide part
(Pole face) 3c is attracted and separated.

The magnetic buffer 10 is made of a magnetic plate material, and is formed in a U shape by the facing pieces 10c, 10c and the connecting piece 10a. The relationship between the thickness of the magnetic buffer 10 and the depth of the buffer recesses 3d, 3d is important, and the depth of the buffer recesses 3d, 3d depends on the magnetic buffer 10.
Be equal to or greater than the thickness of. In addition, the opposing piece 10c,
10c is larger than the thickness of the wide part (pole surface) 3c sandwiched between the buffer recesses 3d and 3d, and the outer method is
Set smaller than between the armatures 7 and 7 of 6. This magnetic buffer
The opposing piece 10c of 10 is held between the magnetic pole surface 3c and the armature 7 by the magnetic force of the permanent magnet 8.

Regarding the action of the magnetic buffer 10,
The operation will be described with reference to FIGS. 3 (a) to 3 (c). (a)
Is the armature 7 on the left side of the armature 6 and the pole face of the fixed iron core 3.
It is in the state of being sucked by 3c. In this case, even if the coil 4 is not excited, that state is maintained by the magnetic force of the permanent magnet 8. In addition, the magnetic buffer 10 is a facing piece on the left side.
10c is located in the buffer recess 3d on the left side and is also held by the magnetic force of the permanent magnet. And the opposite piece 10 on the left
Although c is interposed between the armature 7 on the left side and the pole face 3c of the fixed iron core 3, it does not hinder the direct contact between the armature 7 and the pole face 3c.

In this state, the permanent magnet flowing through the fixed iron core 3
When the coil 4 is excited so that a magnetic flux in the direction of canceling the magnetic flux of 8 is passed, the magnetic flux by the coil 4 also flows to the right armature 7 and attracts it, and the armature 6 starts moving in the arrow direction. Then, as shown in (b), the right armature 7 comes into contact with the right facing piece 10c. Therefore, Amatya 6 is a permanent magnet.
The magnetic buffer 10 held by the holding force of 8 moves while moving against the holding force, and as shown in (c), the armature 7 on the right side moves the magnetic pole surface 3c of the fixed iron core 3. Is sucked into.

That is, since the armature 6 collides with the magnetic pole surface 3c by reducing its moving speed, the collision noise at that time can be reduced. Even when the coil 4 is no longer excited in the state of (c), the state of the armature 6 is maintained by the magnetic force of the permanent magnet 8, and the magnetic buffer 10 also has a right facing piece 10c with a right buffer concave portion 10c. It is located in the place 3d and is also held by the magnetic force of the permanent magnet. And the right facing piece
Although 10c is interposed between the armature 7 on the right side and the magnetic pole surface 3c of the fixed iron core 3, it does not hinder the direct contact between the armature 7 and the magnetic pole surface 3c.

In other words, the magnetic buffer 10 is moved by the armature against the holding force of the permanent magnet when the armature is attracted to the magnetic pole surface, and when moved, the armature and the magnetic pole surface. It does not interfere with the contact of the. Therefore, unlike the conventional example, the original total stroke in the suction force characteristic diagram does not decrease, and the suction force for holding the armature does not decrease.

In order to move the armature 6 in the opposite direction from the state of (c), the coil 4 may be excited so that the magnetic flux in the opposite direction to that in the previous case may flow, and the magnetic buffer 10 may be different from the previous case. By the same action, Amatya 4 returns to the state of (a).

FIG. 4 shows a modification of the magnetic buffer 10 and the magnetic pole surface 3c of the fixed iron core 3. This one is the recess for buffer 3d, 3d
A wide recess (pole face) 3c sandwiched between
3e is provided, and the connecting piece 10a of the magnetic buffer 10 is narrowed to be located in the through recess 3e. With this, the length of the electromagnet device corresponding to the longitudinal direction of the fixed iron core 3 can be shortened, and the magnetic buffer 10 can be held more reliably.

FIG. 5 shows another modified example. This is because the buffer recesses 3d and 3d are formed on one side of the wide part (pole face) 3c.
It is provided only on the upper side (in the figure), and a through recess 3e is further provided at the center thereof, so that the narrow connecting piece 10a of the magnetic buffer 10 is located in the through recess 3e.

FIG. 6 shows another modification of the same.
This is because the recesses 3d, 3d for the buffer body are formed in the wide part (pole face) 3c.
Is provided in the center, and a through hole 3f is further provided in the center, the connecting piece 10a of the magnetic buffer 10 is formed into a stepped round bar shape and penetrates the through hole 3f, and the opposing pieces 10c, 10c are caulked and fixed. In this case, the holding of the magnetic buffer 10 becomes more reliable than the above-described modification.

FIG. 7 shows the magnetic buffer 10 of FIG. 4 or 5.
In this modified example, two opposing pieces 10c, 10c made of a magnetic plate material and a connecting piece 10a made of a non-magnetic plate material are separately formed and integrated later.

Although the permanent magnet has been described as a member constituting an armature in the embodiment or the modification, it may be inserted in a magnetic member, that is, a yoke or a fixed iron core. Further, the shape of the magnetic buffer body, the structure for holding the magnetic buffer body, and the like can be appropriately changed.

[0031]

In the electromagnet device of the present invention, the operating speed of the armature is reduced by moving the magnetic buffer held by the magnetic force of the permanent magnet, and therefore the collision noise is also reduced, and the magnetic buffer moves. Since it does not hinder the contact between the armature and the magnetic pole surface when it is urged, the stroke of the armature does not decrease, and the suction force for holding the armature does not decrease, thus reducing the collision noise of the armature and reducing the suction force. It does not deteriorate the characteristics.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part thereof.

3A to 3C are explanatory diagrams of the operation.

FIG. 4 is an exploded perspective view of essential parts showing a modification of the magnetic buffer and the fixed iron core.

FIG. 5 is an exploded perspective view of an essential part showing another modification thereof.

FIG. 6 is an exploded perspective view of an essential part showing still another modification thereof.

FIG. 7 is a perspective view showing a modified example of the magnetic buffer.

FIG. 8 is an exploded perspective view showing a conventional example.

9A and 9B are explanatory diagrams of the operation.

FIG. 10 is a suction force characteristic diagram thereof.

FIG. 11 is an exploded perspective view showing another conventional example.

12A and 12B are explanatory diagrams of the operation.

FIG. 13 is a characteristic diagram of its suction force.

[Explanation of symbols]

 1 Magnetic member 2 Yoke 3 Fixed iron core 3c Wide part (pole face) 3d Buffer recess 4 Coil 5 Coil frame 6 Armature 7 Armature armature 8 Permanent magnet 9 Movable frame 10 Magnetic buffer 10a Magnetic buffer connecting piece 10c Opposite piece of magnetic buffer

Claims (2)

[Claims] 1. A magnetic member wound with a coil and having a magnetic pole surface, an armature having an armature that attracts and separates from the magnetic pole surface, and a permanent magnet interposed in a magnetic circuit including the magnetic member and the armature. In the electromagnet device including, the magnetic force of the permanent magnet is held between the magnetic pole surface and the armature, and when the armature is attracted to the magnetic pole surface, the armature resists the holding force of the permanent magnet. And moved
Also, an electromagnet device is provided with a magnetic buffer that does not hinder the contact between the armature and the magnetic pole surface when moved. 2. The magnetic member has magnetic pole surfaces on both sides,
In addition, it has a fixed iron core in which a buffer recess having a depth equal to or greater than the thickness of the magnetic buffer is formed on both magnetic pole surfaces, and the armature has two armatures which are attracted to and separated from each magnetic pole surface and the armatures interposed therebetween. The electromagnet device according to claim 1, wherein the electromagnet device comprises a permanent magnet to be inserted and is attached to a rotatable movable frame.