JPH02143508A - Electromagnet device - Google Patents

Abstract

PURPOSE:To reduce the irregularity in the state of contact between a yoke and an armature, and to make it possible to reduce the irregularity in magnetic attraction force by a method wherein, before the fixture of an iron core and the fixing part of the iron core provided on the base-end piece of the yoke, the iron core is formed into the shape with which it can be moved in the direction orthogonally intersecting with the axis of the iron core. CONSTITUTION:The title electromagnet device is provide with a rod-like iron core 1, a coil 2 wound around the core 1 excluding its both end parts 1a and 1b, a yoke 3 formed in L-shape on a base-end piece 3a and a tip piece 3b and the base-end piece 3a is fixed to one end part 1a of the iron core in such a manner that the tip piece 3b is positioned in the vicinity of the coil 2, and an armature whereon the base-end piece 4a is supported by the other end part 1b of the iron core in such a manner that the tip piece 4b comes in contact with or supported from the surface of the tip piece 3b of the yoke 3. The fixing part 3e of the core provided on the base-end piece 3a of the yoke is formed in the shape which can be moved in the direction orthogonally intersecting with the axis L of the core 1. As a result, when the yoke 3 is fixed to the core 1, it can be fixed in line with the position of the armature 4, and the irregularity in contact state between the yoke 3 and the armature 4 can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is suitable for electromagnetic relays, etc., in which a yoke and an armature move toward and away from each other near the outside of a coil, and which do not use a permanent magnet. Relating to electromagnetic devices.

[Prior Art] As a first conventional example of this type of electromagnet device, there is one shown in FIGS. 3 and 4. That is, long and short pieces A
Cork A, which has a U-shape with a and Ab, has a long piece A.
A coil 88 is wound around the coil frame Ba through a coil frame Ba, and an armature C is supported at the end of the long piece Aa so as to be able to come into contact with and separate from the short piece Ab.

Further, there is a second conventional example as shown in FIGS. 5 and 6. In other words, the yoke A has a C-shaped corner formed by a U-shaped piece into which the coil B wound through the coil frame Ba is inserted and an L-shaped piece E, and the tip end is the end of the L-shaped piece E. The base end of the armature C is supported by a U-shaped piece so that it can be moved toward and away from the armature C.

[Problems to be Solved by the Invention] The conventional electromagnet device described above has the advantage of basically ensuring a large contact area between the armature C and the yoke A, but when actually mass-produced, There are some difficulties in stabilizing performance.

That is, in the first conventional example, since the yoke A requires bending, it is difficult to maintain the positional accuracy of the short piece Ab that becomes the contact part (magnetic pole part). Since the shape piece requires bending, it becomes difficult to maintain the plane accuracy including the end of the L-shaped piece E, which becomes the contact portion (magnetic pole part), and the end of the U-shaped piece. These difficulties increase as the distance between the opposing U-shaped pieces becomes smaller.

If these accuracy deteriorates, the contact state between the yoke A and the armature C will vary, resulting in increased variation in the magnetic attraction force.

The present invention has been made in view of the above reasons, and its purpose is to provide an electromagnet device that can reduce variations in the contact state between a yoke and an armature, and thereby reduce variations in magnetic attraction force.

[Means for Solving the Problems] In order to achieve the above object, an electromagnet device of the present invention includes a bar-shaped iron core 1 and a coil wound around the iron core except for both ends 1a and 1b of the iron core 1. 2, the proximal end piece 3a and the distal end piece 3
The yoke 3 has an L-shape at b, and the base end piece 3a is fixed to one end 1a of the iron core so that the end piece 3b is located near the coil 2, and the base end piece 4a and the end piece 4b form an L shape. The armature 4 has a base end piece 4a supported by the other end 1b of the iron core so that the front end piece 4b can come into contact with and separate from the surface of the front end piece 3b of the yoke 3. The fixing portion 3e of the iron core provided on the piece 3a is shaped so that it can move in a direction orthogonal to the axis of the iron core 1 before being fixed to the iron core 1.

[Function] In such a polarized electromagnet device, both the yoke 3 and the armature 4 are L-shaped, making it easy to maintain bending accuracy, and when fixing the yoke 3 to the iron core 1, the armature 4 Since the yoke 3 and the armature 4 can be fixed in accordance with the position thereof, variations in the contact state between the yoke 3 and the armature 4 can be reduced.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

■ is the iron core, which is made of magnetic material and has a rod shape with a square cross section. Around the iron core 1, both ends 1a and lb of the iron core 1 are placed.
The coil 2 is wound in a state where . A resin is coated between the iron core 1 and the coil 2 in consideration of insulation and protection of the coil 2 in stages. Reference numerals 2a and 2a are flanges for forming a coil, which are fixed through the iron core 1 to prevent the coil from spreading at both ends 1a and lb.

3 is a yoke, which is made of magnetic material and has a proximal end piece 3a and a distal end piece 3b.
It is L-shaped. The base end piece 3a of this yoke 3 is fixed to one end portion 1a of the iron core so that the front end piece 3b is located near the coil 2. The fixing portion 3e provided on the base end piece 3a for this fixation is a rectangular through hole in this embodiment. In FIG. 1, this through hole has a shape that can be moved in a direction perpendicular to the axis of the iron core 1 with the iron core 1 passing through it, that is, the inner diameter in the direction perpendicular to the plane of the paper is approximately the same as that of the iron core 1. The inner diameter in the vertical direction is sufficiently larger than the iron core 1.

4 is an armature, which is made of magnetic material and has a proximal end piece 4a and a distal end piece 4.
It has an L-shape consisting of b. The armature 4 has a proximal end piece 4a supported by the other end 1b of the iron core so that an outer surface 4C of the end piece 4b can come into contact with and separate from an inner surface 3C of the end piece 3b of the yoke 3.

Specifically, a notch 4d through which the other end 1b of the iron core 1 can be inserted is cut out from the end surface of the base end piece 4a, and the bottom edge of the cutout is used as the fulcrum 4e. The armature 4 is supported by the other end 1b while being applied with a spring force on the separation side by a return spring (not shown) or the like.

Such an electromagnetic device first includes a collar 2a at a predetermined position of an iron core 1.
2a is penetrated and fixed, and the iron core 1 between the tsuba'la and 2a is fixed.
Wind the coil 2 around the . Next, the armature 4 is supported on the other end portion 1b of the iron core 1, and the fixed portion 3e of the yoke 3 and the one end portion 1a of the iron core 1 are temporarily fitted. And amateur 4
The contact position is regulated by a jig or the like, and the tip piece 4b
The yoke 3 is moved in a direction perpendicular to the axis of the iron core so that the outer surface 4C of the cork 3 and the inner surface 3C of the tip piece 3b of the cork 3 come into surface contact. The fixing portion 3e is fixed.

FIG. 1 shows the energized state of the coil 2, that is, the contact state of the armature 4. When the coil is demagnetized, the armature 4 is rotated clockwise by a return spring (not shown) and is in a separated state.

When this electromagnet device is incorporated into an electromagnetic relay or the like, the armature 4 is connected to a movable contact spring or the like so that the movable contact spring responds to the armature 4.

The electromagnet device of this embodiment can reduce variations in the contact state between the yoke and the armature, and does not require the work of inserting a coil wound around the U-shaped yoke as in conventional devices. Since the coil is wound around the coil, there is no need for a coil frame, making it easier to secure the coil space, making it more compact, and increasing the ampere turns.

Although the armature of this embodiment has an outer surface that comes into contact with and separates from the inner surface of the yoke, the inner surface of the armature may also come into contact with and separate from the outer surface of the yoke.

[Effects of the Invention] Since the electromagnet device of the present invention is configured as described above, both the yoke and the armature are L-shaped, and bending accuracy can be easily maintained, and when the yoke is fixed to the iron core, Since the armature can be fixed in accordance with the position of the armature, variations in the state of contact between the yoke and the armature can be reduced, thereby reducing variations in the magnetic attraction force.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a longitudinal sectional view showing a conventional example, and FIG. 4 is an exploded perspective view thereof. FIG. 5 is a longitudinal sectional view showing another conventional example, and FIG. 6 is an exploded perspective view thereof. 1-iron core, 1a/-m one end, 1b-other end, L
-- Axis of one iron core, 2 - coil, 3 - yoke, 3a - proximal piece, 3b - tip piece, 3e
- fixed part, 4- armature, 4a - proximal piece, 4b - tip piece. Figure 1

Claims (1)

[Claims] (1) A rod-shaped iron core, a coil wound around the core except for both ends of the core, and a base end piece and a tip piece forming an L-shape, with the tip piece being located near the coil. The base end piece is fixed to one end of the iron core, and the base end piece and the tip piece form an L shape, and the base end piece is attached to the iron core so that the tip piece can come into contact with and leave the surface of the tip piece of the yoke. and an armature supported at the other end, and the fixing part of the iron core provided on the proximal end piece of the yoke is shaped to be movable in a direction orthogonal to the axis of the iron core before being fixed to the iron core. An electromagnetic device characterized by: