JPS63126207A - Electromagnet device - Google Patents

Abstract

PURPOSE:To reduce the magnetic reluctance when an armature is released from an iron core and to increase the response speed of the armature by a method wherein an auxiliary pole piece, surrounding the peripheral fringe of the armature, is provided to the iron core or a yoke. CONSTITUTION:An auxiliary pole piece 8 is provided to a magnetic pole 6 of an iron core 1 surrounding an armature 4 excluding the side of a yoke 3. As a result, when a current is applied to a coil 2 in a state wherein the armature 4 and the magnetic pole 6 are separated, attracting force works between the armature 4 and the auxiliary pole piece 8, too. Consequently, as the attraction force working on the initial movement of the armature 4 is increased, the response speed of the armature is increased and the armature works in a highly sensitive manner.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to an electromagnet device equipped with an armature applied to a relay or the like.

[Background Art] Generally, as shown in FIGS. 6 and 7, this type of electromagnet device includes a coil 2 wound around an iron core 1, and one magnetic pole of the coil 2 connected to the iron core 1 at one end. The yoke 3 is magnetically coupled to the yoke 3 at the other end of the yoke 3 so that it can swing freely between the position where the other magnetic pole of the coil 2 contacts the iron core 1 and the position away from the iron core 1. 3 and an armature 4 pivotally supported. Therefore, in this configuration, when the coil 2 is energized, an attractive force acts, and the armature 4 comes into contact with the iron core 1, as shown in FIG. , if you return
7, the armature 4 is separated from the iron core 1 as shown in FIG.

By the way, as shown in FIG. 7, when the armature 4 is separated from the iron core 1, the magnetic resistance increases due to the existence of a gap between the iron core 1 and the armature 4, so the coil 2 cannot be excited. There is a problem in that it is difficult to obtain a sufficiently large suction force when the That is, the fill 2 is in an excited state,
In the initial state where the attractive force acts on the armature 4, there is a lot of leakage magnetic flux, so there is a problem that the initial response is slow.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its object is to improve the strength of the armature when the fill is excited while the armature is separated from the iron core. An object of the present invention is to provide a highly sensitive electromagnetic device with improved responsiveness by applying a large attractive force at the time of initial movement.

[Disclosure of the Invention 1 (Structure) The electromagnetic device according to the present invention includes a fill wound around an iron core, and one magnetic pole of the coil that is magnetically coupled to the iron core, with a part facing the other magnetic pole of the coil. In an electromagnetic VC device comprising a yoke and an armature pivoted to the yoke so as to be swingable between a position where the other magnetic pole of the coil contacts the iron core and a position away from the iron core, When the armature is separated from the iron core and the magnetic circuit formed by the yoke, iron core, and armature is open, the auxiliary pole piece that reduces the magnetic resistance between the armature and the iron core is the armature. It is formed on either the iron core or the yoke to surround the periphery of the coil, and increases the attractive force that acts on the armature when the coil is excited, increasing sensitivity. be.

(Example 1) As shown in FIGS. 1 and 2, an iron core 1 is inserted into a cylindrical coil frame 5 having an outer flange, and a coil 2 is wound around the fill frame 5. Both ends of the iron core 1 protrude from the coil frame 5, and the -i section is mechanically and magnetically coupled to the yoke 3. Further, a magnetic pole piece 6 is integrally formed at the other end of the iron core 1 so as to be in close contact with the outer flange of the coil frame 5.

The yoke 3 is formed in an abbreviated shape, with an iron core 1 inserted through the center of the horizontal piece and magnetically coupled to the iron core 1, and a vertical piece extending along the side of the fill 2 to the other side of the coil 2. It's coming.

As shown in FIG. 1, a notch 7 is formed at the tip of the vertical piece of the yoke 3, and the bottom surface of the notch 7 is formed on substantially the same plane as the surface of the magnetic pole piece 6. The armature 4 is installed in the notch 7 so as to be swingable. That is, the armature 4 has an abbreviated shape, and is formed by re-curving a magnetic plate so that the vertical piece and the horizontal piece form an obtuse angle, and the inner surface of the newly-curved portion hits the corner of the notch 7. They are pivoted so that they can swing freely. The armature 4 is moved by a return mechanism (not shown) such as a return spring so that the horizontal piece of the armature 4 returns to the magnetic pole piece 6.
is biased away from the A substantially U-shaped auxiliary pole piece 8 with one side open on the yoke 3 side is formed in the magnetic pole piece 6 so as to surround the armature 4 . That is, the auxiliary pole piece 8 is formed to protrude from the surface of the magnetic pole piece 6 in the axial direction of the coil 2.

With the above configuration, in a non-excited state where the coil 2 is not energized, the horizontal piece of the armature 4 is separated from the magnetic pole piece 6 by the return means. From this state, when the coil 2 is energized and energized, the armature 4. Magnetic force acts not only on the opposing surface of the magnetic pole piece 6 but also between the auxiliary pole piece 8 and the armature 4, and the armature 4 is rapidly attracted to the magnetic pole piece 6 side. . That is, when the armature 4 is separated from the magnetic pole piece 6, the armature 4 and the auxiliary pole piece 8
The distance between the armature and the pole piece 6 is shorter than the distance between the armature 4 and the magnetic pole piece 6, and since the auxiliary pole piece 8 surrounds the armature 4, the magnetic flux around the magnetic pole piece 6 is not diverged and the contact An attractive force acts between the pole piece 4 and the auxiliary pole piece 8, and leakage magnetic flux can be reduced. In this way, as shown in FIG. 3, when the distance (stroke) between the armature 4 and the magnetic pole piece 6 is large, a large attractive force is generated compared to the conventional one (indicated by the broken line). Therefore, the initial speed can be increased.

(Example 2) In Example 1, an example was shown in which the yoke 3 was formed in an abbreviated shape, but in this example, the yoke 3 is formed in an approximately U shape.

As shown in FIGS. 4 and 5, the iron core 1 is attached to the coil frame 5.
The structure is similar to that of the first embodiment in that the coil 2 is inserted through the coil frame 5, the coil 2 is wound around the coil frame 5, and one end of the iron core 1 is mechanically and magnetically coupled to the yoke 3. ing. Incidentally, a head piece 9 having an outer flange shape is formed at the other end of the iron core 1. The yoke 3 is approximately U-shaped, and one end of the iron core 1 is inserted into the center of the central piece, and both legs of the yoke 3 are arranged along the sides of the coil 2, respectively. That is, the coil 2 is arranged inside the yoke 3. A notch 7 is formed at the tip of one leg of the yoke 3, as in the first embodiment, and the armature 4 is mounted within this notch 7. The armature 4 is swingable between a position where it abuts against the head piece 9 and a position 1d where it is HE from the head piece 9. The tip of the other leg of the yoke 3 protrudes from the end face of the coil 2 more than the head piece 9, and a pair of auxiliary pole pieces 8' parallel to the end face of the coil 2 are attached to the armature 4.
The yoke 3 is integrally protruded from the leg of the yoke 3 so as to extend along the side edge of the yoke 3. That is, the armature 4 is housed in a space surrounded by the tip of the yoke 3 and the auxiliary pole piece 8'. 'Rig piece 9 will be located in the center between both auxiliary pole pieces 8'.

With the above configuration, when the coil 2 is energized, the PIS5
As shown by the arrow in the figure, a magnetic circuit is formed by the iron core 1, yoke 3, and armature 4, and a part of the magnetic flux passes through the auxiliary pole piece 8' between the armature 4 and the head piece 9. Therefore, when the armature 4 initially moves, a larger attractive force acts than in the conventional case. In this way, as in the first embodiment, the suction force at the position where the armature 4 is away from the head piece 9 can be increased even in the conventional upward direction, and the initial speed of the armature 4 can be increased. This is possible.

[Effects of the Invention] As described above, the present invention includes a coil wound around an iron core, a yoke that is magnetically coupled to the iron core at one magnetic pole of the coil, and a portion of which faces the other magnetic pole of the fill. In an electromagnet device comprising an armature pivoted to a yoke so as to be swingable between a position where the other magnetic pole of the coil contacts the iron core and a position away from the iron core, the armature is made of iron. An auxiliary pole piece surrounds the periphery of the armature to reduce magnetic resistance between the armature and the iron core when the magnetic circuit formed by the yoke, the iron core, and the armature is open away from the core. The armature is formed on either the iron core or the yoke, and the presence of the auxiliary pole piece reduces the magnetic resistance at the position where the armature is far from the iron core, even in the conventional case. Since the leakage magnetic flux is reduced, the attractive force that acts on the armature when it first moves when the coil is excited increases, resulting in a faster response of the armature, which has the advantage of operating with high sensitivity. be.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing Embodiment 1 of the present invention, FIG. 2 is a sectional view of the same as above, FIG. 3 is an explanatory view of the same as above, and FIG. 4 is an exploded perspective view of Embodiment 2 of the present invention. , fpJ5 is a sectional view of the same as above, and FIGS. 6 and 7 are explanatory diagrams of operation showing a conventional example. 1 is the iron core, 2 is the fill, 3 is the yoke, 4 is the armature, 8,
8゛ is an auxiliary pole piece.

Claims (3)

[Claims] (1) A coil wound around the iron core, a yoke that is magnetically coupled to the iron core at one magnetic pole of the coil and partially facing the other magnetic pole of the coil, and a yoke that is connected to the iron core by the other magnetic pole of the coil. In an electromagnet device equipped with an armature pivoted to a yoke so as to be able to swing freely between a position in contact with the iron core and a position away from the iron core, the armature separates from the iron core and comes into contact with the yoke and the iron core. An auxiliary pole piece surrounds the periphery of the armature to reduce the magnetic resistance between the armature and the iron core when the magnetic circuit formed by the iron core and the yoke is open. An electromagnetic device characterized in that it is formed on one side. (2) The electromagnet device according to claim 1, wherein the auxiliary pole piece is formed on a surface of the iron core facing the armature so as to surround the periphery of the armature. (3) The above-mentioned yoke is formed into a substantially U-shape, and the center part is magnetically coupled to the iron core by one magnetic pole of the coil, and both legs of the yoke face the other magnetic pole of the coil, and an armature is attached to one leg. is pivotally supported, and auxiliary pole pieces are integrally provided extending from the other leg of the yoke along both side edges of the armature to the vicinity of the iron core. The electromagnetic device described in section.