JPH01315920A - Electromagnet with single stable pole - Google Patents

Abstract

PURPOSE:To increase both the absorption force at the starting of operation and that near the completion of operation, and to realize a high sensitivity, by making three yokes in specific forms. CONSTITUTION:At both ends of the coil 1 of a plunger 2, contact makers 3 and 4 are provided respectively. In a yoke 5, a magnetic pole 6 opposite to the inner side of the contact maker 3 is formed, and in a yoke 7, a magnetic pole 8 opposite to the outer side of the contact maker 4 is formed. A permanent magnet 9 is placed at the middle position of the yoke 5 and the yoke 7, and the end 10 of the yoke 5 is extended to the contact maker 4 side. On condition that a current is not applied to the coil 1, the magnetic flux of the magnet 9 passes mainly through the phi1, and generates and maintains a large absorption force at the clearances g2 and g4. When a current is applied to the coil 1, magnetic fluxes phi2 and phi3 are generated to reduce the absorption force in the clearances g2 and g4, and the absorption force in the clearances g1 and g3 and, g5 and g6 is increased to move the movable iron cores upward. By such a constitution, the magnetic flux phi1 can be increase because the clearance g3 is closer at the starting time of operation, and the magnetic flux phi3 can be increased because the clearances g5 and g6 are closed after the operation is completed. Consequently, the magnetic flux phi3 is made larger and a high sensitivity is realized.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a monostable polar electromagnet applied to electromagnetic switching devices such as relays.

[Conventional technology]

As a conventional monostable polar electromagnet, there is one shown in FIG. 5 that was previously proposed by the inventor. In FIG. 5, the plunger 14 is passed through the coil 15, armatures 16 and 17 are provided at both ends of the coil 15, and the first yoke 18 is disposed outside the coil 15 and inside the armature 16. A second magnetic pole part 19 is formed facing the armature 17 , a second yoke 20 is arranged outside the coil 15 , and a second magnetic pole part 21 is formed facing the outside of the armature 17 . A permanent magnet 22 is interposed between the middle part of the third yoke 20 and the middle part of the second yoke 20.
One of the magnetic pole parts 24 and 25 of the three magnetic pole parts 24 and 25 was arranged to face the inside of the armature 17, and the other was arranged to face the outside of the armature 16. Furthermore, there is a method shown in FIG. 6 that has been separately proposed by the inventor. The one shown in FIG. 6 uses the first yoke 18, second yoke 20 and permanent magnet 22 shown in FIG.
It extends to the side.

[Problem to be solved by the invention]

Regarding conventional polarized electromagnets, the one shown in FIG. 5 is suitable for single a contact operation, and the one shown in FIG. 6 is suitable for single b contact operation. However, when having both the a contact and the 1) contact, each has its own disadvantages. That is, the excitation attraction force of the item in Figure 5 is expressed as fl in Figure 7, and the attraction force at the right end is sufficient, but the attraction force at the left end is weak, while the excitation attraction force in the item in Figure 6 is expressed as fl in Figure 7. The suction force, represented by f2 in the figure, is sufficient at the left end, but weak at the right end. In addition, in Fig. 7, f is the unexcited attractive force, fa
indicates the a contact spring load, and fl+ indicates the 1) contact spring load. The present invention has been made in view of the above-mentioned points of the prior art, and its purpose is to increase both the suction force at the start of operation and the suction force near the completion of operation, and to increase the suction force at the a contact point, I] To realize high sensitivity of an electromagnetic switchgear having a contact point.

[Means to solve the problem]

In order to achieve the above object, in the present invention, the first magnetic pole part of the first yoke and the armature are arranged non-opposingly when there is no magnetic starvation, and the end of the first yoke is connected to the armature. A third yoke that is molded to extend to the side and has an excitation part that is placed outside the coil and faces the inside of one armature, and has a magnetic pole part that faces the outside of the other armature. It is.

[Function l] In the monostable polar electromagnet configured as described above, the extended molded end of the first yoke and the armature are close to each other at the start of operation, so the magnetic flux when the coil is excited is extremely low. In addition, after the operation is completed, the attraction force can be increased by the third yoke. [Example] An example will be explained with reference to the drawings. In Figure 1,
Armatures 3 and 4 are provided on both ends of the coil 1 of a plunger 2 that passes through the coil 1, respectively. The first yoke 5 is arranged outside the coil 1 and forms a first magnetic pole part 6 facing inside the armature 3. The second yoke 7 is arranged outside the coil 1 and forms a second magnetic pole portion 8 facing the outside of the armature 4 . A permanent magnet 9 is interposed between the intermediate portion of the first yoke 5 and the intermediate portion of the second yoke 7, and the end portion 10 of the first yoke 5 is molded to extend toward the armature 4 side. The third yoke 11 is disposed outside the coil 1, has a magnetic pole s12 facing the inside of one armature 4, and has a magnetic pole portion 13 facing the outside of the other armature 3. In the state shown in FIG. 1, no excitation current is applied to the coil 1, and the magnetic flux of the permanent magnet 9 mainly passes through φ1 and is maintained by generating a large attractive force in the gap g2+g4. When an exciting current is applied to the coil 1 in this state, the magnetic flux φ2,
φ3 is generated, the attraction force in the gap g2+H+ becomes smaller, the excitation attraction force in the gaps gxgs and 85+g6 becomes larger, and the movable iron core formed by the plunger 2 and the armature 3.4 moves upward. At the beginning, through the state shown in Figure 2, the third stage
It operates as shown in the diagram. In the state shown in FIG. 1 at the start of operation, since the open gap g3 between the end 10 of the first yoke 5 and the armature 4 is close to each other, the magnetic flux φ2 when the fill 1 is excited can be increased, and In the state shown in FIG. 3 after the operation is completed, the air gap gs+gs remains closed, so the magnetic flux φ3 is large and a large attractive force can be obtained. FIG. 4 shows another embodiment of the present invention, in which the gap 86 between the third yoke 11 and the armature 4 is not opposed to each other as in the embodiments of FIGS. The end of the yoke 11 is extended and the armature 4 is placed close to it. As a result, the magnetic flux φ3 at the start of operation can be made larger than in the embodiments shown in FIGS. 1 to 3.

【Effect of the invention】

Since the present invention is configured as described above, both the suction force at the start of the operation and the suction force near the completion of the operation can be increased, and a
This has the effect of increasing the sensitivity of an electromagnetic switching device having contacts and b contacts.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention before the operation starts, FIG. 2 is a vertical cross-sectional view during the same operation, FIG. 3 is a vertical cross-sectional view after the same operation is completed, and FIG. 5 is a longitudinal sectional view of an example of the conventional example, FIG. 6 is a longitudinal sectional view of another example of the conventional example, and FIG.
The figure is a characteristic diagram of a conventional example. 1 is a coil, 2 is a plunger, 3 is an armature, 4 is an armature, 5 is a first yoke, 6 is a first magnetic pole part, 7 is a second yoke, 8 is a second magnetic pole part, 9 is a Permanent magnet, 10 is the end,
11 is a third yoke, 12 is a magnetic pole portion, and 13 is a magnetic pole portion. Agent Patent Attorney Ishi 1) Ai Shichi

Claims (1)

[Claims] (1) a coil; a plunger passing through the coil and having armatures provided at both ends of the coil;
a first yoke forming a first magnetic pole portion disposed outside the coil and facing the inside of the armature; a second yoke disposed outside the coil and facing the outside of the armature;
A monostable polarized electromagnet comprising a second yoke forming a magnetic pole part, and a permanent magnet interposed between an intermediate part of the first yoke and an intermediate part of the second yoke. At times, the first magnetic pole part of the first yoke and the armature are arranged not to face each other, and the end of the first yoke is extended toward the armature,
A unit characterized in that a third yoke is provided, which is disposed outside the coil and has a magnetic pole portion facing the inside of one of the armatures, and a third yoke having a magnetic pole portion facing the outside of the other armature. Stable polarized electromagnet.