JP2532392Y2 - Electromagnet device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet device, and more particularly to an electromagnet device incorporated in an electromagnetic relay.

[0002]

2. Description of the Related Art Conventionally, as an electromagnet device, for example, there is one described in Japanese Utility Model Application Laid-Open No. 63-143842. That is, as shown in FIG. 11, a coil 3 is wound around a spool 2 in which an iron core 1 having a substantially U-shaped cross section is insert-molded to form an electromagnet portion 4, and a plate-like shape is formed via a substantially rectangular hinge spring 5. Is rotatably supported by the electromagnet section 4. The hinge spring 5 is caulked and fixed at one end 5a to a side end surface of the iron core 1 and is caulked and fixed at the other end 5b to the center of the rear surface of the movable iron piece 6, thereby forming one magnetic pole of the iron core 1. One end 6a of the movable iron piece 6 in contact with the surface 7 is a pivot point, while the other end 6b of the movable iron piece 6 is opposed to the other magnetic pole surface 8 of the iron core 1 so as to be able to contact and separate therefrom.

When a voltage is applied to the coil 3 to excite it, the magnetic pole surface 8 of the iron core 1 attracts the other end 6b of the movable iron piece 6, so that the movable iron piece 6 is hinged with the one end 6a as a fulcrum. It turns against the spring force of the spring 5. FIG.
The two-dot chain line hinge spring shown in FIG. 1 illustrates the shape of the hinge spring before mounting.

[0004]

However, in the above-described electromagnet device, it is difficult to obtain a desired attractive force characteristic, and in particular, a long stroke in which the distance between the pole face 8 of the iron core 1 and the other end 6b of the movable iron piece 6 is long. Since a large initial driving force cannot be obtained with a type of electromagnet device, and a high voltage needs to be applied to the coil 3, there is a problem that power consumption is large.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an electromagnet device capable of obtaining a large attractive force and saving power consumption.

[0006]

In order to achieve the above object, an electromagnet device according to the present invention has one end of a movable iron piece attached to one of a pair of magnetic pole surfaces of an iron core around which a coil is wound. An electromagnet that rotatably supports the other magnetic pole surface, and has an attracting surface located at the other end of the movable iron piece so as to be able to contact and separate from the other magnetic pole surface, and rotates the movable iron piece based on excitation and demagnetization of the coil; In the apparatus, a thin claw protruding toward the opposing surface is provided on one edge of either the attracting surface of the opposing movable iron piece or the magnetic pole surface of the iron core.

[0007]

Therefore, according to the present invention, when a voltage is applied to the coil to excite it, a thin claw provided on the iron core or the movable iron piece is provided near the attracting surface of the opposing movable iron piece or near the magnetic pole surface of the iron core. Since the respective portions are located, more magnetic flux flows through the thin claw portion at the time of initial driving than in the conventional example.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the electromagnet device according to the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the electromagnet device according to the first embodiment includes an electromagnet portion 31 formed by winding a coil 30 around a spool 20 in which a substantially U-shaped iron core 10 is insert-molded.
The movable iron piece 50 is rotatably supported via a hinge spring 40.

The iron core 10 has magnetic pole faces 13 and 14 located substantially on the same plane at both ends 11 and 12, respectively, and the outer edge of the magnetic pole face 14 is obliquely cut so as to be inclined. An auxiliary pole surface 15 is formed.

The spool 20 has a recess 22 in one of the flanges 21 into which a hinge spring 40 described later can be inserted, and a bent portion 4 of the hinge spring 40 described later.
It has press-fit grooves 23 and 24 for press-fitting and fixing 3,44 (FIG. 2).

As shown in FIG. 2, the hinge spring 40 is formed by integrally forming bent portions 43 and 44 with the arms 41 and 42 on both sides, and biasing tongues 45 from between the arms 41 and 42.
Is extended and bent. Then, the hinge spring 40 is inserted into the concave portion 22 of the spool 20, and the bent portions 43, 44 are press-fitted into the press-fit grooves 23, 24 of the spool 20, thereby fixing the hinge spring 40 to the spool 20.

The movable iron piece 50 is formed by bending a stamped plate-like material by press working, and is provided with position regulating shoulders 52, 52 (rear shoulders) at the base of a mounting frame 51 formed at one end. Portion is not shown), and the other end of the plate-shaped material is bent and raised in a direction opposite to the mounting frame 51 to form a thin claw portion 53.
Is formed.

When the mounting frame 51 of the movable iron piece 50 is assembled to the biasing tongue piece 45 of the hinge spring 40, the movable iron piece 50 is biased by the spring force of the biasing tongue piece 45.
The shoulders 52, 52 are pressed against the arms 41, 42 to regulate the position, while the lower surface of the movable iron piece 50 abuts against the edge of one of the magnetic pole surfaces 13 of the iron core 10 and is rotatably supported. You. Further, the suction surface 54 located at the other end of the movable iron piece 50 faces the magnetic pole surface 14 of the iron core 10 so as to be able to contact and separate therefrom,
The claw portion 5 of the movable iron piece 50 is
3 are substantially parallel.

Therefore, in the case of non-excitation, the hinge spring 4
1 with the outer edge of the pole face 13 of the iron core 10 as a fulcrum due to the spring force of the urging tongue piece 45 of FIG.
Are urged in a counterclockwise direction.

Next, the distance from the auxiliary magnetic pole surface 15 of the iron core 10 to the claw portion 53 of the movable iron piece 50 is shorter than the distance from the magnetic pole surface 14 of the iron core 10 to the attraction surface 54 of the movable iron piece 50. Therefore, when a voltage is applied to the coil 30 to excite it, a large amount of magnetic flux flows between the auxiliary magnetic pole surface 15 of the iron core 10 and the claw portion 53 of the movable iron piece 50, and a larger amount of magnetic flux flows as compared with the conventional example as a whole. . For this reason, the iron core 10 sucks the movable iron piece 50 with a larger suction force than in the conventional example. As a result, the movable iron piece 50 can be rotated against the spring force of the hinge spring 40 with a lower applied voltage than in the conventional example.

Then, when the magnetic pole surface 14 of the iron core 10 and the attracting surface 54 of the movable iron piece 50 approach each other as the movable iron piece 50 rotates, the claw 53 is thin, so that magnetic saturation occurs and the auxiliary magnetic pole surface 15 is formed. The magnetic flux density between the magnetic pole surface 14 and the attracting surface 54 does not increase, and the magnetic attraction between the magnetic pole surface 14 and the attracting surface 54 increases. Abuts on the upper end of the flange 25 of the spool 20.

When the excitation of the coil 30 is released,
Due to the spring force of the urging tongue piece 45 of the hinge spring 40, the movable iron piece 50 rotates counterclockwise in FIG. 1 and returns to the original state.

(Experimental Example) Next, an attractive force characteristic of an electromagnet device having substantially the same shape as that of the first embodiment was measured. Iron core 10, movable iron piece 5
0 and detailed external dimensions are shown in FIGS. In particular, iron core 1
The external dimensions of the main part of the movable iron piece 50 are shown in FIGS. The thickness A of the claw portion 53 of the movable iron piece 50 is indicated by a hatched portion 53 in FIG.
a, excision of 0.2mm from the outside for each of 53b, 53c,
In each case, the suction power was measured. Tables 1 and 2 show the measurement results. In this experimental example, the stroke S refers to the distance from the upper end of the flange 25 of the spool 20 to the lower surface of the movable iron piece 50 for convenience. The magnetomotive force is 50 amp turns
(AT).

[0019]

[Table 1]

[0020]

[Table 2]

As is clear from the measurement results in Tables 1 and 2, when the stroke S before operation is large, that is, when the distance from the magnetic pole surface 14 of the iron core 10 to the attraction surface 54 of the movable iron piece 50 is long, It was found that the initial attraction force of the movable iron piece 50 having the claw portion 53 was about 50% greater than the initial attraction force of the movable iron piece 50 having no claw portion.

It was found that the movable iron piece having the claw portion was sucked with a larger suction force until immediately before the stroke S became zero.

Further, when the stroke S is 0, that is, when the distance from the magnetic pole surface 14 of the iron core 10 to the attraction surface 54 of the movable iron piece 50 is the shortest, the movable iron piece 50 having the claw 53 It was found that the suction force was almost the same as the suction force of the movable iron piece 50 having no claw portion. In particular, it was found that as the thickness of the claw portion 2 became thinner, the suction force of the movable iron piece 50 having the claw portion became equal to the suction force of the movable iron piece having no claw portion. As a result, by providing the movable iron piece 50 with the thin claw portion 53,
It has been found that the attractive force of the electromagnet device is improved as a whole.

It is considered that the slight variation in the attraction force between Tables 1 and 2 is due to the influence of residual magnetism. Further, in the above-described embodiment, the case where the thin claw portion 53 is provided on the movable iron piece 50 has been described. However, the present invention is not limited to this case.
A thin claw portion 14a may be provided at the edge of the fourth member (second embodiment). Further, the electromagnet device is not limited to the above-described embodiment, but may be of the type shown in FIG. 10 (third embodiment).

[0025]

As is clear from the above description, according to the electromagnet apparatus of the present invention, the electromagnet device according to the present invention is provided on one of the edges of the attracting surface of the opposing movable iron piece or the magnetic pole surface of the iron core, and on the facing surface side. Since the projecting thin claw portion is formed, the tip of the thin claw portion is located near the magnetic pole surface or the attracting surface. For this reason, when the coil is excited, more magnetic flux flows through the thin claw portion than in the conventional example to generate an attraction force, and the attraction force is larger than that without the claw portion, particularly a large attraction during the initial drive. Power is gained. As a result, there is an effect that the movable iron piece can be rotated with a low applied voltage, and power consumption can be saved.

[0026]

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of an electromagnet device according to the present invention.

FIG. 2 is an exploded perspective view showing the first embodiment of the electromagnet device according to the present invention.

FIG. 3 is an enlarged view of a main part before operation showing the first embodiment of the electromagnet device according to the present invention;

FIG. 4 is an enlarged view of a main part after operation of the first embodiment of the electromagnet device according to the present invention.

FIG. 5 is a perspective view of a movable iron piece according to an experimental example of the first embodiment.

FIG. 6 is a perspective view of an iron core according to an experimental example of the first embodiment.

FIG. 7 is an enlarged view of a main part according to an experimental example of the first embodiment.

FIG. 8 is an enlarged view of a main part of a movable iron piece according to an experimental example of the first embodiment.

FIG. 9 is a sectional view showing a second embodiment.

FIG. 10 is an exploded perspective view showing a third embodiment.

FIG. 11 is a sectional view of an electromagnet device according to a conventional example.

[Description of Signs] 10: iron core, 11, 12: end portion, 13, 14: magnetic pole surface, 3
0: coil, 50: movable iron piece, 53: thin claw portion, 54:
Suction surface.

Claims (1)

(57) [Scope of request for utility model registration] An end of a movable iron piece is rotatably supported on one of a pair of magnetic pole surfaces of an iron core around which a coil is wound, and the other end of the movable iron piece is supported on the other magnetic pole surface. In the electromagnet apparatus, the attracting surfaces located in the portion are made to face each other so as to be able to contact and separate from each other, and the movable iron piece is rotated based on the excitation and demagnetization of the coil. An electromagnet device characterized in that a thin claw portion protruding toward the facing surface is provided on one of the edges.