JPS5919379Y2 - electromagnet - Google Patents

Description

[Detailed description of the invention] Technical field of the invention This invention relates to an improvement of a flat type electromagnet having a hinge structure.

Background of the invention In general, electromagnets with a flat hinge structure are
Many of them have a structure in which a flat iron core and an armature, which is also flat, are placed so that their planes face each other and are operated by suction.

However, in the case of this type of structure, for example, a combination of an E-shaped core and a U-shaped armature, the coil is wound around the center leg of the E-shaped core (hereinafter simply referred to as the core), and the coil is wound around the inner leg of the core. The tip of the leg of the armature (hereinafter simply referred to as armature) is rotatably attached with a hinge spring, etc.
The armature is biased to return by a return spring.

Then, by energizing the coil, magnetic flux is generated in the iron core, and the armature is attracted to the iron core against the force of the return spring, and by cutting off the energization to the coil, the return spring returns the armature. .

In the case of this electromagnet, the armature has to resist the return force of the return spring when the coil is energized, so the load increases as the stroke of the armature increases, and a large amount of operating power is required. Ta.

Furthermore, in order to obtain reliable operation, it is necessary to adjust the load on the return spring during manufacturing, which requires time for assembly.

Furthermore, since the armature is attracted to the armature on a plane parallel to the direction of the magnetic flux in the iron core, the magnetic flux is dispersed over the entire surface of the contact surface, resulting in a weak attraction force, and due to the action of the above-mentioned return spring, it may malfunction due to shock, vibration, etc. There is.

Purpose of the invention This invention was made in view of the above-mentioned shortcomings of the prior art.It is an object of this invention to bias the armature back to its original state without the need for a return spring, and to improve the holding force when the armature is attracted to the iron core. The purpose is to provide an electromagnet that can.

Structure and effect of the invention According to this invention, two plate-shaped armatures are joined at a predetermined angle, and the tips of both legs of a U-shaped iron core are sandwiched and supported between the joint ends of the two armatures. Therefore, the rotation angle (stroke) of the armature is set by the coupling angle, and the electromagnet can have an accurate operating stroke, and when driving other members with the armature, the appropriate pressing force is applied to the other members. can be given.

In addition, one side of the armature is formed from two pieces of magnetic material, and permanent magnets with different magnetic poles are placed in the gap between the two pieces of magnetic material located between the legs of the U-shaped core.
There is no increase in the load that biases the armature in the direction of returning it as the operating stroke of the armature increases.
It can be used as an electromagnet with low operating power, and
If the magnetic flux of the permanent magnet is determined in advance during manufacturing, there is no need for load adjustment, the number of assembly steps can be reduced, and an inexpensive electromagnet can be provided.

Furthermore, a predetermined suction surface where the leg flat surface of the U-shaped iron core and the armature come into contact is left on the magnetic pole surface portion of the armature and the U-shaped iron core, and the flat leg of the U-shaped iron core extends from the suction surface to the support. The cross-sectional area of the part is made smaller than the cross-sectional area of the magnetic pole surface where the leg and armature come into contact, so that the magnetic flux is concentrated on the magnetic pole surface, so a large holding force can be obtained, reducing the load and stabilizing the operating stroke. Combined with this, a flat electromagnet with extremely good operating characteristics can be obtained.

DESCRIPTION OF EMBODIMENTS This invention will be explained below with reference to the drawings which are one embodiment.

1 is a flat U-shaped iron core, 2 is a coil wound around its base, and 3 and 4 are armatures connected at a predetermined angle by connecting parts (not shown);
are leg portions 1a and lb protruding from both ends of the base of the iron core 1;
A base is swingably supported at the tip of the leg of the iron core 1 so as to face the upper and lower planes of the iron core 1, respectively.

The upper armature 3 in the figure has a base piece 3a on the hinge side with a non-magnetic plate 5 made of plastic or the like, and arms 3b on the suction side protruding from both ends of the base piece 3a as legs of the iron core 1. It is shorter than la and lb and consists of a single U-shaped iron piece 6, while the lower armature 4 in the figure has a base piece on the hinge side made up of a non-magnetic plate 7, and the suction side side made up of two L-shaped pieces. Several pieces 8,
9 and a permanent magnet 10 are connected.

11.12 is the leg 1 of the iron core 1 facing the armature 3
This is a step provided in the planes a and lb, and this step makes the cross-sectional area of the armature arm from the armature suction surface to the armature support portion smaller than the cross-sectional area of the armature suction surface.

This step 11.12 is a predetermined suction surface al, b2 where the tips of the legs 3a, 3b and the leg flat surface of the iron core 1 come into contact when the armature 3 is attracted to the leg flat surface of the iron core 1.
It is set in a position where it can be left behind.

Then, due to this step 11.12, the armature 3
When is attracted to the leg plane of the iron core 1, there is a gap gl between them, that is, between the leg plane of the iron core 1 and the armature 3,
This is to form g2.

When this electromagnet is not energized, the armature 4 on the side provided with the permanent magnet 10 is attracted to both legs 1a and lb of the iron core 1 by the magnetic flux of the permanent magnet 10, and the armature 4
is in a state away from the core legs 1a and 1b (the state shown in FIG. 1).

Now, when a current is applied to the coil 2 wound around the iron core 1 in a direction that cancels the magnetic flux of the permanent magnet 10, the armature 4 moves away from the legs 1a and lb of the iron core 1, and the armature 3
are attracted to the legs 1a and lb of the iron core 1.

This state will be maintained as long as coil 2 is energized, but
When the current to the coil 2 is cut off, the armature 4 is again attracted to the legs 1a and 1b of the iron core 1 by the magnetic flux of the permanent magnet 10, and the state shown in FIG. 1 is restored.

By the way, when this electromagnet is in a state where the armature 3 is attracted to the leg plane of the iron core 1, that is, in an operating state,
Gaps gl and g2 exist between the armature 3 and the legs 1a and lb of the iron core 1, and the armature 3 has the arms 3a and 1b of the iron core 1.
, 3b's tip suction surface a1. It is in contact with the leg plane of the iron core 1 at a2.

Therefore, the magnetic flux generated by the coil 2 is transferred to the attraction surface a1, which is located away from the hinge point. By concentrating on a2, it is possible to obtain a sufficiently large holding force.

Note that the steps 11° and 12 for forming the gaps gl and g2 are
is as small as 0.05 mm to 0.1 mm, so the difference in permeance between the presence and absence of gaps gl and g2 before suction is small, and there is little change in characteristics such as operating voltage and return voltage.

In the embodiment described above, steps 11 and 12 are provided in the leg plane of the iron core 1 in order to form the gaps gl and g2,
This is advantageous in preventing an increase in magnetic path resistance during operation.

However, the means for forming the gap is not limited to this, and for example, a step may be provided on the armature 3 side.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of this invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a section III-III in Fig. 2.
A line sectional view and FIG. 4 are enlarged side views of main parts during operation. 1...U-shaped iron core, la, lb...leg, 2...coil, 3, 4...armature, 3a...・Base piece, 3b...leg, 11.12...step, al, al...
・Adsorption surface, gl, g2... void.

Claims (1)

[Scope of utility model registration request] A flat U-shaped core has a base around which one coil is wound and legs protruding from both ends of the base. Two flat armatures are joined together, one of the armatures is formed of two pieces of magnetic material, and permanent magnets with different magnetic poles are placed in the gap between the pieces of magnetic material located between the two legs. and leaving a predetermined suction surface where the leg plane of the U-shaped iron core and the armature come into contact on the magnetic pole surface of the other of the U-shaped iron core and the armature, and extending from this suction surface to the unsupported portion. An electromagnet characterized in that a cross-sectional area of a leg of the U-shaped iron core is smaller than a cross-sectional area of a magnetic pole surface in contact between the leg and an armature.