JP3126274U - electromagnet - Google Patents

Abstract

An electromagnet capable of obtaining a high magnetic flux density is provided.
An electromagnet in which a coil is wound around an iron core, the iron core including a main body portion inserted into a coil cavity, and a tip end portion at a position facing the outside from the coil cavity. The tip portion 20 has a pointed shape. The tip portion 20 has a magnetic flux generated in the main body portion 10 composed of a vertical surface 22 continuous with one side surface of the main body portion 10 and an inclined surface 23 inclined with respect to the other side surface of the main body portion 10. As it exits, it passes through the narrower top surface 21, increasing the magnetic flux density and increasing the magnetic force in the magnetic field.
[Selection] Figure 1

Description

  The present invention relates to an electromagnet. More specifically, the present invention relates to an electromagnet in which a coil is wound around an iron core.

  Conventionally, the structure of an electromagnet is obtained by winding a coil around an iron core (see Non-Patent Document 1). Its basic structure has not changed. The shape of the iron core is also the same, and the main body portion around which the coil is wound and the tip thereof have the same shape. That is, if the iron core is a round bar, the diameter remains the same, and if the iron core is a square bar, the dimensions of each side remain the same.

  However, the present inventors have found that the above-described shape has a certain upper limit to the obtained magnetic flux density, but the obtained magnetic flux density becomes higher when the shape is changed.

Illustrated Machine Glossary 2nd Edition, page 395, first published on January 30, 1983, published by Nikkan Kogyo Shimbun

  In view of the above circumstances, an object of the present invention is to provide an electromagnet capable of obtaining a high magnetic flux density.

The electromagnet of the first device is an electromagnet in which a coil is wound around an iron core, and the iron core has a main body portion inserted into a cavity of the coil and a tip at a position facing the outside from the cavity portion of the coil. And the tip is pointed.
The electromagnet of the second device is the inclined surface in which the one end of the electromagnet of the second device is a vertical surface continuous with one side of the main body and the other side is inclined with respect to the other side of the main body. It is characterized by being.

According to the first device, when the magnetic flux generated in the main body portion exits from the pointed tip portion, it passes through a narrower space, so that the magnetic flux density is increased and the magnetic force in the magnetic field is increased.
According to the second device, since the other side surface of the tip portion is inclined, no magnetic field lines are radiated from the other side surface, and all the magnetic force lines come out from the top surface of the tip portion having a small point. For this reason, a magnetic force line is concentrated in a small space, and magnetic force becomes high.

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an electromagnet according to an embodiment of the present invention.

In FIG. 1, A is an electromagnet, which is composed of an iron core 1 and a coil 2.
The iron core 1 is illustrated as having a horseshoe shape, but it may be a single bar. Although the coil 2 is wound around the iron core 1, the coil 2 may be wound directly, or may be wound around the bobbin 3 and the iron core 1 may be inserted into the cavity of the bobbin 3.
In the illustrated embodiment, two coils 2 and bobbins 3 are used in accordance with the iron core 1 having a horseshoe shape.

  The iron core 1 is composed of two main body portions 10 and a connecting portion 11 connecting them. The upper end portion of each main body portion 10 is called a tip portion 20 and is formed in a sharp shape. This pointed shape is a feature of the present invention. In addition, the material of the iron core 1 is obtained by punching a thin plate such as soft iron into a predetermined shape and stacking it to give a certain thickness.

FIG. 2 is a perspective view of the iron core in the electromagnet of the present invention. FIG. 3 is a front view of the iron core. FIG. 4 is a side view of the iron core.
The shape of the tip 20 will be described with reference to FIGS. The shape of the tip portion 20 is composed of a leading edge top surface 21, a vertical surface 22 and an inclined surface 23 connected to the tip surface 21, and has a sharp shape.

The vertical surface 22 is a vertical surface extending continuously with the inner surface 12 of the main body 10. The inclined surface 23 is a surface inclined with respect to the outer surface 13 of the main body 10.
In the embodiment of FIGS. 2 to 4, the inclined surface 23 is composed of two inclined surfaces, an upper inclined surface 24 and a lower inclined surface 25, and a flat connecting surface 26 is connected between them.
Moreover, the thickness is thinner than the thickness of the main-body part 10, for example, is 1/3-2/3 rank.

The shape of the tip 20 is not limited to the above, and may be the shape shown in FIGS.
The shape of FIG. 5A is the same in that it has a top surface 21 and a vertical surface 22, but has a single inclined surface 23.
The shape of FIG. 5B is the same in that it has a top surface 21 and a vertical surface 22, but an inclined surface 23 and a horizontal end surface 27 are formed.
In addition to the above, the tip portion 20 of the present invention only needs to have a pointed shape toward the most advanced top surface 21, and various shapes can be adopted without being limited to the above-described form.

According to the iron core 1 of each of the above embodiments, the magnetic flux generated in the main body 10 when the coil 2 is energized passes through a narrower space when exiting from the pointed tip 20, so that The magnetic flux density increases, and the magnetic force in the magnetic field increases.
Further, no magnetic field lines are emitted from the inclined surface 23 of the tip portion 20 and all the magnetic field lines emerge from the small and sharp top surface 21, so that the magnetic field lines are concentrated and emitted from the top surface 21 having a small area. So the magnetic force becomes high.

  The iron core 1 in the present invention is not limited to the horseshoe shape shown in the drawings, but also includes a single bar. Then, the tip has a pointed shape as shown in FIG. 3 or FIG.

  The electromagnet of the present invention can be used in all industrial fields.

It is sectional drawing of the electromagnet which concerns on one Embodiment of this invention. It is a perspective view of the iron core in the electromagnet of this invention. It is a front view of the iron core. It is a side view of the iron core. It is a partial front view which shows the front-end | tip part of the iron core in the electromagnet which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Iron core 2 Coil 10 Main-body part 20 Tip part 21 Top surface 22 Vertical surface 23 Inclined surface

Claims (2)

An electromagnet in which a coil is wound around an iron core,
The iron core has a main body portion inserted into the cavity of the coil;
It consists of a tip portion at a position facing the outside from the hollow portion of the coil,
An electromagnet characterized in that the tip has a pointed shape. The said front-end | tip part is a perpendicular | vertical surface where the one side surface followed the one side surface of the said main-body part, and the other side surface is an inclined surface inclined with respect to the other side surface of the said main-body part. electromagnet.

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