JPS60208806A - Electromagnet - Google Patents

Abstract

PURPOSE:To obtain a large holding force by a very simple and low-price constitution such that the force for holding a movable member does not fluctuate when being drived, by forming a buffer member with material in which paramagnetic powder is contained. CONSTITUTION:After a dumper 4 is formed in a plate shape with rubber in which paramagnetic powder is mingled, it is secured on the upper face of a stationally core 3. When the winding 2 is energized, a magnetic path which circulates through the stationally core 3, yoke 1, a movable core 5 and the dumper 4, is formed so that the movable core is attracted toward the stationally core to be displaced in the direction of arrow B. Since the movable core 5 strikes the dumper 4, its shock can be weakened and the movable core 5 can be held by the magnetic force at the position restricted by the dumper 4.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an electromagnet device, and more particularly to an electromagnet in which a buffer member is provided at a contact portion where a movable magnetic member is attracted by an electromagnet and comes into contact with it. It is related to the device.

[Prior art]

The structure of an electromagnet device equipped with this type of buffer member is widely used to prevent damage to the contact part and muffle contact noise, but conventionally, the arrangement of the contact part and buffer member described above
Two types of structures are known, as shown in FIGS.

- In the electromagnet device shown in FIG. 1, the reference numeral 1 is a yoke that forms part of the magnetic path, and is formed in the shape of a hollow housing with an opening 1a on the top surface. A fixed core 3 with a winding 2 attached thereto is provided at the center of the bottom surface of the magnet, thereby forming an electromagnet. Also, around the opening 1a on the upper surface of the yoke 1, there is provided a damper 4, which is the above-mentioned buffer member.
is fixed. The damper 4 is formed into a plate shape from an elastic non-magnetic material such as rubber, and has a hole 4a that matches the opening 1a. This hole 4a and opening 1
A movable core 5, which is the above-mentioned movable magnetic member, is fitted into a space provided on the fixed core 6 in the yoke 1 so as to be movable in the directions of arrows A and B. The upper end of the movable iron core 5 projects above the damper 4, and a flange 5a is formed on the outer periphery of this upper end.

In the above structure, when the device is not driven, the movable core is displaced in the direction indicated by the arrow by means such as a spring (not shown). When the device is driven, the winding 2 is energized, and a magnetic path is formed from the winding 2 through the fixed core 3, the yoke 1, and the movable core 5, and the movable core 5 is attracted to the fixed core 6 and displaced in the B direction. However, in this case, the flange portion 5a is brought into contact with the damper 4 and is regulated, so that the movable core 5 does not collide with the fixed core B, but is stopped at a predetermined gap, and is held at that position by magnetic force. is configured to be First, the impact of the above contact is absorbed by the elasticity of the damper 4.

However, this configuration has the drawback that it is difficult to appropriately set the width of the gap, resulting in variations in the holding force that holds the movable core 5 during driving.

On the other hand, in the structure shown in Fig. 2, a damper 4 formed in a plate shape from a non-magnetic material having elasticity similar to that described above is directly applied to the upper surface, which is the suction surface of the fixed iron core, which is different from the structure shown in Fig. 1. By bringing the bottom surface of the movable core 6 into contact with this, the movable core 5 is regulated and the damper 4 is
This is the gap mentioned above. Therefore, the movable iron core 5 is not provided with the above-mentioned flange.

However, in the case of this structure, both iron cores 3 and 5 during the above drive
It is easy to set the gap width between the two, but since a non-magnetic damper is interposed in the magnetic path, the magnetic resistance of the magnetic path increases accordingly, which weakens the holding force of the fixed core during driving. 1. Conversely, in order to sufficiently obtain the above-mentioned holding force, a large amount of electric power is required.

〔the purpose〕

The present invention has been made in view of the above circumstances, and is an electromagnet device in which a buffer member is provided at the contact portion between the movable magnetic member and the electromagnet as described above, in which the movable member is held during driving. It is an object of the present invention to provide an electromagnet device that can obtain a large holding force with no variation in holding force and consumes less power.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4. In both figures, the same reference numerals are given to the same or corresponding members as in FIGS. 1 and 2, and explanations of the same members are omitted.

[First Embodiment] FIG. 3 shows the structure of an electromagnet device according to a first embodiment of the present invention. As shown in the figure, in this embodiment, the yoke 1, winding 2, fixed core 3, and movable core 5 are constructed in the same manner as the conventional structure shown in FIG. 2, and the damper 4 is also formed in a plate shape. Although it is fixed to the top surface of the movable iron core 6,
This damper 4 is made of rubber mixed with paramagnetic powder.

When the device is driven, the winding 2 is energized in the same manner as described above, and the fixed core 6, yoke 1, movable core 5, and damper 4
A magnetic path is formed through the! 11. The movable iron core 5 is attracted to the fixed iron core 6 and is displaced in the direction of arrow B.

The movable iron core 5 contacts the damper 4 to weaken the impact of the contact, and is held by magnetic force at a position regulated by the damper 4.

In this case, since the damper 4 has magnetic properties due to the inclusion of paramagnetic powder, the magnetic resistance of the magnetic path is lower than in the conventional example shown in FIG. 2, and the above-mentioned holding force is increased accordingly.

In addition, in this case, as in the conventional example shown in Fig. 2, the damper 4 itself does not create a gap between the two iron cores 6 and 5, and the gap width can be easily set, so that the above-mentioned holding force is uniform for each device. Provides holding power.

[Second Embodiment] FIG. 4 shows the structure of an electromagnet device according to a second embodiment of the present invention. In this case, there is no joke different from the first embodiment described above, and the fixed core 3 has a substantially U-shaped cross section, and the winding 2 is wound around one side of the fixed core 3. There is. Further, a plate-shaped damper 4 made of rubber mixed with paramagnetic powder is fixed to the upper surface of both sides of the fixed core 60, as described above. A movable iron piece 6 is provided. The movable iron piece 6 is rotatably provided in the directions of arrows A and B via a hinge portion 6a with respect to a base frame 7 on which the electromagnet device is provided.

When the device is driven, a magnetic path passing through the fixed iron core 3, the damper 4, and the movable iron piece 6 is formed by energizing the winding 2 as described above, and the movable iron piece 6 is attracted to the fixed iron core 6 and moves in the direction of arrow B. , and is attracted and held by the fixed iron core B via Dannoku-4.

In this case as well, the same effect as described above can be obtained through the magnetic damper 4.

Even if the electromagnetic device has different structures for each of its constituent parts, if it uses the damper described above, it can be made from rubber mixed with the paramagnetic powder described above. The aforementioned effects can be obtained.

Note that the material for forming the damper is not limited to the above-mentioned rubber, and the damper may be formed from other materials suitable for the buffer member, such as elastic plastic mixed with paramagnetic powder.

Further, the damper may be provided on the side of the movable member that is attracted by the electromagnet.

〔effect〕

As is clear from the above description, according to the present invention, in an electromagnetic device in which a buffer member is provided at a contact portion where a movable magnetic member is attracted by an electromagnet and comes into contact with it, paramagnetic powder is mixed. Since the buffer member is formed from a material, it is possible to obtain a large holding force with no variation in the holding force for holding the movable member during driving with an extremely simple and inexpensive structure.

Therefore, it is possible to provide an electromagnet device with high reliability and low power consumption.

[Brief explanation of the drawing]

1 and 2 are side sectional views of different conventional electromagnet devices, FIG. 3 is a side sectional view of an electromagnet device according to the first embodiment of the present invention, and FIG. 4 is a side sectional view of the electromagnet device according to the second embodiment. FIG. 3 is a side sectional view of the electromagnet device. 1... Yoke 2... Sealing 3... Fixed core 4... Damper 5... Movable core 6... Movable iron piece Patent applicant Canon Electronics Co., Ltd. Figure 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] An electromagnet device in which a buffer member is provided at a contact portion where a movable magnetic member is attracted by an electromagnet and comes into contact with the electromagnet, wherein the buffer member is formed from a material mixed with paramagnetic powder. Device.