JPH0584645B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electromagnet device, and more particularly to a monostable electromagnet device used in a drive device such as a relay.

[Background Art] In general, in this type of electromagnetic device, the configuration for monostable operation is such that magnetic pole surfaces are formed at both ends of an iron core and both ends of an armature corresponding to each magnetic pole surface are formed. It is known that a residual plate is inserted into one of a pair of gaps to increase magnetic resistance.
In other words, by using a residual plate, the attraction force between the magnetic pole face and the armature in each gap is made different to achieve monostable operation. In this case, due to the presence of the residual plate between the armature and the magnetic pole face, a gap at least equal to the thickness of the structural plate is required between the armature and the magnetic pole face, so the armature as a whole The stroke becomes large, making it difficult to achieve high sensitivity.

[Object of the Invention] The present invention has been made in view of the above points, and its main purpose is to enable monostable operation without using a residual plate, An object of the present invention is to provide an electromagnet device that operates with a small armature stroke and high sensitivity.

[Disclosure of the Invention] Examples Examples of the present invention will be described below based on the drawings. As shown in FIGS. 1 and 2, the coil block 1 has a substantially U-shaped iron core 11 that is open upward.
, a cylindrical coil frame 12 formed of a molded product into which the intermediate piece of the iron core 11 is inserted, and a coil 13 wound around the coil frame 12. The iron core 11 and the coil frame 12 are integrally molded,
The coil frame 12 has flanges 17 at both ends in the axial direction, and a support base 14 on the outer periphery of the middle part in the axial direction.
It is integrally molded into a shape with . Support stand 14
The upper surface is open and a magnet insertion groove 15 is formed, and a fulcrum receiving groove 18 is provided as a shaft support at the opening edge of the magnet insertion groove 15 and at both ends in a direction orthogonal to the axial direction of the coil frame 12. It is formed. Inside the magnet insertion groove 15 is a rectangular parallelepiped magnet piece 16 magnetized in the vertical direction, with one magnetic pole surface in contact with the iron core 11 and the other magnetic pole surface aligned with the lower end of the fulcrum receiving groove 18 . will be inserted. Here, since the support stand 14 is formed in the middle part of the coil frame 12 in the axial direction, the coil 13 is wound around both ends of the coil frame 12 with the support stand 14 in between. The support stand 14 is formed to be located slightly to the left of the center in FIG. 1 in the longitudinal direction of the intermediate piece of the iron core 11.
The fulcrum receiving groove 18 formed at the upper end of the support base 14 is formed corresponding to the center of the intermediate piece of the iron core 11 in the longitudinal direction.

The armature block 2 includes an armature 21 made of a magnetic material formed in a substantially rectangular flat plate shape, and an armature 21 formed in a longitudinally intermediate portion of the armature 21.
The support member 22 is a molded product integrally molded with the support member 22. Rotating shafts 23 serving as fulcrum portions are integrally protruded from both ends of the armature 21 in the width direction and from the side surfaces of the support member 22, respectively, and the rotating shafts 23 are fitted into the fulcrum receiving grooves 18 of the coil block 1. Once installed, the armature block 2 is supported so as to be swingable relative to the coil block 1. With the armature block 2 supported by the coil block 1, the armature 21
The lower surfaces of both ends in the longitudinal direction face each magnetic pole surface of the iron core 11, respectively.

Next, the operation will be explained based on FIGS. 3 and 4. FIG. 3 shows a schematic configuration, and the magnet piece 16 is arranged to the left of the longitudinal center of the intermediate piece of the iron core 11 in the figure. However,
Considering the closed magnetic path of the iron core 11 → the armature 21 → the magnet piece 16 → the iron core 11 on both sides of the armature 21, the length of the magnetic path and the fulcrum 23 and the magnet piece 16 are considered.
4, the suction force with the iron core 11 at the left end of the armature 21 in FIG. 3 is greater than the suction force with the iron core 11 at the right end. That is, when the coil 13 is not energized, the left end of the armature 21 is attracted to the iron core 11. As described above, monostable operation can be performed in which the left end of the armature 21 is the normally closed end (NC) and the right end is the normally open end (NO). coil 1
3 is energized, one end of the armature 21 in the longitudinal direction is attracted to one of the magnetic poles of the iron core 11 according to the direction of magnetization of the iron core 11, and the armature block 2 swings. Of course, a closed magnetic path of → magnet piece 16 → iron core 11 is formed. In addition, since the coil block 1 and the armature block 2 are accurately positioned, characteristics such as attraction force are stable, and when used as an electromagnetic device for driving the contacts of a relay, stable operation can be achieved. It is.

[Effects of the Invention] As described above, the present invention provides a coil block in which a coil is wound around an intermediate piece of an iron core formed in a substantially U-shape, and both ends thereof facing both end surfaces of the iron core. The armature block is equipped with an armature and is pivoted at a fulcrum provided at a fixed position approximately in the center between both legs of the iron core, and is arranged to be able to swing freely relative to the coil block. In an electromagnet device comprising a magnet piece that abuts the intermediate piece and the other magnetic pole face faces the armature, and a closed magnetic path passing through the iron core, the armature, and the magnet piece is formed, the magnet piece is attached to the intermediate piece of the iron core. Since it is located at a position offset from the straight line connecting the center and the fulcrum of the armature block toward one of the magnetic poles of the iron core, monostable operation can be performed without using a residual plate. As a result, the stroke of the armature becomes smaller and has the advantage of highly sensitive operation. Furthermore, if the magnet piece is placed in the center of the intermediate piece of the iron core, bistable operation will be achieved, which has the advantage that parts can be shared with bistable electromagnet devices.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention, Figure 2 is a side view showing one embodiment of the present invention;
The figure is an exploded perspective view of the same as the above, FIG. 3 is a schematic configuration diagram of the same as the above, and FIG. 4 is an explanatory diagram of the same as the above. 1 is a coil block, 2 is an armature block, 11 is an iron core, 13 is a coil, 18 is a fulcrum receiving groove, 21 is an armature, and 23 is a rotating shaft.

Claims (1)

[Claims] 1 A coil block in which a coil is wound around an intermediate piece of an iron core formed in a substantially U-shape, and an armature with both ends facing both end faces of the iron core, approximately at the center between both leg pieces of the iron core. The armature block is pivotally supported by a fulcrum provided at a fixed position, and a magnet piece has one magnetic pole surface in contact with the intermediate piece of the iron core and the other magnetic pole surface faces the armature, and the iron core and In an electromagnetic device in which a closed magnetic path is formed through an armature and a magnet piece, the magnet piece is shifted toward one of the magnetic poles of the iron core from the straight line connecting the center of the intermediate piece of the iron core and the fulcrum of the armature block. An electromagnet device characterized in that the electromagnet device is arranged at a position where