JPH05326255A - Electromagnet device - Google Patents

Abstract

PURPOSE:To obtain an electromagnet device reducing the operation noise without influencing attraction characteristics. CONSTITUTION:An electromagnet device consists of a yoke 1, electromagnetic coil 2, coil form 3, armature 4, moving frame 6, and a buffer member 8 which buffers the collision of the armature 4 immediately before it reaches a first or second position. The buffer member 8 is provided with an inclination; a long hole 6c is formed such that the moving frame 6 can be moved in the direction that it is energized by a plate spring 7 and further its rotational radius is varied against the spring force. Thus the electromagnet device is so constituted that the armature 4 or yoke 1 will slide the inclination of the buffer member 8 immediately before the armature 4 reaches the first or second position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet device suitable for application to, for example, a relay by reducing operating noise.

[0002]

2. Description of the Related Art Generally, an electromagnet device includes a yoke that forms a magnetic path and has a contact surface at an end thereof, an electromagnetic coil wound around the yoke, and a contact pole that contacts and separates from the contact surface of the yoke. Having a surface to control the excitation of the electromagnetic coil
It is provided with an armature that moves between a (for example, operation) position and a second (for example, return) position to perform a contact / separation operation. Therefore, when the armature reaches the first position or the second position, they collide and emit a collision sound. When a relay to which such an electromagnet device is applied is incorporated into household electrical equipment,
Since the collision sound is not preferable and also causes contact bounce, various proposals have been made in recent years to soften the collision.

As a typical means for such countermeasures, as shown in FIG. 9, a buffer member 7 for buffering the collision is provided at the collision portion between the yoke 1 and the armature 4, that is, at the contact surface. 2 is an electromagnetic coil, 3 is a coil frame that is inserted into the central leg piece 1a of the yoke 1 and around which the electromagnetic coil 2 is wound, and 3c is a coil that serves as a pivot of a movable frame (not shown) that supports the armature 4. The shaft provided on the frame 3 and the permanent magnet 5 in the case of the polar type. FIG. 9 (a) shows a state in which the armature 4 is moving at a substantially intermediate point between the first position and the second position, and FIG. 9 (b) shows a state in which it is stationary at the first position or the second position.

[0004]

Although the above-mentioned typical means, that is, the one using the cushioning member, is effective in reducing the collision noise, a magnetic air gap is generated between the yoke and the armature, so that the magnetic attraction occurs. This causes other problems such as a decrease in force and a decrease in the displacement of the armature. This problem can be explained by the suction force characteristic curve shown in FIG. 10 in which the horizontal axis is the stroke and the vertical axis is the suction force.
In other words, the stroke of the armature without the cushioning member is
The one between S0 and S3 is the
It becomes smaller between S1 and S2, so that the attraction force when stationary at the first position or the second position decreases from f0 to f1 and the load that can be opened and closed when applied to the relay also becomes smaller. That is, the S0-S1 distance and the S2-S3 distance are approximate values of the thickness of the cushioning member.

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 capable of reducing operating noise without affecting attraction force characteristics.

[0006]

In order to solve such a problem, an electromagnet device according to the present invention comprises a yoke which forms a magnetic path and has an end face with a pole face, and an electromagnetic coil wound around the yoke. , The first position and the second position by controlling the excitation of the electromagnetic coil by having a contact surface that contacts and separates from the contact surface of the yoke.
An armature that moves between positions to perform a contact / separation operation, and a movable frame that supports the armature and rotates for the contact / separation operation thereof.
In an electromagnet device in which a yoke or an armature is provided with a cushioning member for relaxing the collision immediately before the armature reaches the first position or the second position, an inclined surface is formed in the cushioning member and the movable frame is biased by a spring. In addition, it is formed so as to move in the direction in which the turning radius changes against the spring force, and the armature is the first
The armature or the yoke can slide on the inclined surface immediately before reaching the position or the second position.

[0007]

According to this structure, immediately before the armature reaches the first (movement) position or the second (return) position, the armature or yoke abuts the inclined surface of the buffer member, and the movable frame resists the spring force. While moving, it slides on the inclined surface and contacts the yoke or the armature, so that the moving speed can be reduced, and therefore the operation noise can be reduced without affecting the suction force characteristic.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be explained based on. This embodiment is applied to a polar 4-void type. The members having the same basic functions as those of the conventional example described above are designated by the same reference numerals.

The yoke 1 includes a central leg piece 1a and opposing leg pieces 1b, 1b.
And an L-shaped connecting piece 1c that connects these to each leg piece 1b, 1
a and 1b face each other at substantially equal intervals, and both end portions of the central leg piece 1a and inner surfaces of both end portions of the opposite leg pieces 1b and 1b serve as tangential surfaces. Central leg 1a
A buffer member described later is attached to the center of the end portion of the. For the electromagnetic coil 2, attach the coil frame to the center leg 1a except the contact surface.
It is wound through 3.

The coil frame 3 has a tubular portion and a flange portion at both ends thereof, and one of the flange portions 3a simultaneously forms a coil terminal 3b and a shaft portion which will be a pivotal fulcrum of a movable frame described later.
3c and a spring support portion 3d for urging the movable frame by a spring.

The armature 4 has a U-shape by the connecting pieces 5 composed of the facing pieces 4b, 4b and a permanent magnet, and both end portions of the facing pieces 4b, 4b are connected to and separated from the contact surface of the yoke 1. It becomes a face.
That is, each facing piece 4b, 4b is composed of the central leg piece 1a and both facing leg pieces 1a.
The insides of the voids formed by b and 1b are supported by a movable frame described later while being movable between a first position and a second position in a direction substantially orthogonal to these. Further, each of the facing pieces 4b, 4b is formed with a square hole 4e, 4e at a position related to a cushioning member described later.

The movable frame 6 supports the armature 4 and rotates it, and has a base portion 6a longer than the axial length of the coil frame 3, and has a shaft portion 3c of the coil frame 3 at one end thereof. It has a long hole 6c for fitting and supports the armature 4 on the other end side. The long hole 6c has a long dimension in the direction from one end to the other end, and therefore the movable frame 6 can move in a direction in which the turning radius viewed from the armature 4 changes. 6b and 6b are contact drive units for driving the movable contact when applied to a relay. The movable frame 6 is spring-biased toward the other end by a leaf spring 7 supported by a spring support portion 3d with a relatively weak force, and the elongated hole 6c is normally biased with respect to the shaft portion 3c. There is.

The buffer member 8 is made of a soft material such as rubber and is attached to the center of the end of the central leg piece 1a. The cushioning member 8 has a shape protruding from both surfaces of the central leg piece 1a and having inclined surfaces 8e, 8e having a higher outside and a lower inside. More specifically, the inclined surfaces 8e, 8e are designed so that any one of the square holes 4e abuts immediately before the armature 4 reaches the first position or the second position so as to mitigate the collision.

Such an electromagnet device operates as shown in FIG. In (a), the armature 4 is in the first position (or second position).
Immediately before reaching, the hole edge of the square hole 4e is in contact with the inclined surface 8a of the buffer member 8. When Amatya 4 moves further,
The edge of the square hole 4e slides on the inclined surface 8a while moving the movable frame 6 by the distance x in the direction in which the turning radius of the armature 4 changes against the spring force of the leaf spring 7, and eventually becomes (b). Facing piece as shown
4b contacts the central leg 1a to reach the first position.

FIG. 5 shows the time t of the movable frame 6 in the above operation.
It shows the velocity v [m / s] and the displacement y [mm] with respect to the passage of [sec]. t1 is the contact point when applied to a relay,
t2 is the time when the armature 4 contacts the cushioning member 8, t3 is the time when the armature 4 contacts the yoke 1 and contacts the first or second position, and v0 the conventional armature collides with the yoke. When speed, v1 is the one of this plan Amachiya 4 is the yoke
This is the speed when the vehicle collides with 1. The velocity v1 of the armature 4 is significantly smaller than the velocity v0, and the velocity at time t2 is considerably large, but at this time, since it abuts on the cushioning member 8, the entire collision noise is extremely small.

FIGS. 6 and 7 show a second embodiment of the present invention, in which a cushioning member 8 is attached to both facing pieces 4b, 4b of the armature 4, and one end of the movable frame 6 is attached. Leaf spring
It is characterized in that an insertion hole 6d for inserting 7 is provided and is inserted therethrough. Therefore, contrary to the first embodiment, the movable frame 6 is biased toward the one end side by a relatively weak spring force. Since the other configurations are the same as those in the first embodiment, detailed description will be omitted. Due to this difference in structure,
Immediately before reaching the first position (or the second position)
The inclined surface 8a of the cushioning member 8 attached to the
The operation similar to that of the first embodiment is performed by contacting the end of 1a.

FIG. 8 shows an application example of the present invention.
It is applied to a balanced, armature type that forms. That is, the yoke 1 has a U-shape and one of the opposing leg pieces 1b has a cushioning member.
8 is attached and the electromagnetic coil 2 is wound around the connecting piece via the coil frame 3. The movable frame, that is, the shaft portion 3c that serves as a rotation fulcrum of the armature 4 is formed on the coil frame 3 or another member. The armature 4 comprises a permanent magnet 5 sandwiched between two facing pieces 4b, 4b, and one facing piece 4b is made to correspond to the buffer member 8 and has a rectangular hole 4c.
Further, spring contact portions 4d, 4d with which the leaf springs 7, 7 abut are provided near the centers of the opposing pieces 4b, 4b, respectively. Leaf spring
The base ends of the 7, 7 are appropriately fixed, and the tips thereof are in contact with the spring contact portions 4d, 4d so as to bias the armature 4 upward in the figure with a relatively weak force. In this example, the movable frame 6 also serves as the movable frame 6 (actually omitted), but in that case, a long hole 6c is provided in the center of the permanent magnet 5. Actually, the two opposing pieces 4b, 4b and the permanent magnet 5 are securely fixed, and the long hole 6c
It is desirable to provide a movable frame for forming the spring contact portions 4d, 4d. This application example also performs substantially the same operation as that of the above-described embodiment.

The leaf spring that biases the armature is
It may be replaced with a coil spring or the like. In addition, each embodiment has a polar 4
Although the description has been given for the void type, it is also applicable to the non-polar clapper type.

[0019]

The electromagnet device of the present invention has the first armature.
Immediately before reaching the (operation) position or the second (return) position, the armature or the yoke comes into contact with the inclined surface of the cushioning member, and the movable frame slides on the inclined surface while moving against the spring force. Alternatively, since it is in contact with the armature, its moving speed can be reduced, and therefore, the operation noise can be reduced without affecting the suction force characteristic.

[Brief description of drawings]

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

FIG. 2 is a plan view mainly showing its main part.

FIG. 3 is an enlarged perspective view of a main part thereof.

4A and 4B are explanatory diagrams of the operation.

FIG. 5 is a velocity / displacement characteristic diagram of the armature with respect to the passage of time.

FIG. 6 is an exploded perspective view showing a second embodiment of the present invention.

7A and 7B are explanatory diagrams of the operation.

FIG. 8 is a plan view showing an application example of the present invention.

9A and 9B are plan views showing a conventional example.

FIG. 10 is a characteristic diagram of its suction force.

[Explanation of symbols]

 1 yoke 2 electromagnetic coil 3 coil frame 4 armature 5 permanent magnet 6 movable frame 6c long hole 7 leaf spring 8 cushioning member 8a inclined surface

Claims (1)

[Claims] 1. An electromagnetic coil having a yoke that forms a magnetic path and has a contact surface at an end thereof, an electromagnetic coil wound around the yoke, and a contact surface that separates from and contacts the contact surface of the yoke. By controlling the excitation of the armature to move between the first position and the second position to perform the contacting / separating operation, the movable frame that supports the armature and rotates for the contacting / separating operation, and the armature is the first.
In an electromagnet device having a yoke or an armature with a buffer member for relaxing the collision immediately before reaching the position or the second position, an inclined surface is formed in the buffer member, and the movable frame is biased by a spring and a spring force is applied. The electromagnet device is formed so as to be movable in a direction in which the turning radius changes, and the armature or the yoke can slide on the inclined surface immediately before the armature reaches the first position or the second position. ..