JPH0445213Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an electromagnet device used in an electromagnetic relay or the like.

[Background Art] In an electromagnet device, a fixed iron core is fixed to an L-shaped yoke piece to form an F-shaped yoke having a U-shaped part, a coil is wound around the fixed iron core, and a coil is wound around the fixed iron core, and a fixed iron core is fixed to an L-shaped yoke piece. It was common for an armature supported so as to be angularly displaceable (hinge structure) to move towards and away from the end face of the fixed iron core (attracting and releasing) depending on the excitation state of the coil.
Such electromagnetic devices have low magnetic efficiency due to increased magnetic flux leakage.

In order to improve this drawback, as shown in FIGS. 3 and 4, the yoke A is formed into a U-shape, and a tail portion D extending to the opposite side of the attracted portion C is connected to the armature B. has been proposed.
E is a coil, and G is a magnetic gap.

In this case, the tail portion D picks up the leakage of the magnetic flux flowing when the coil E is excited, and therefore the effect of increasing the magnetic flux in the magnetic gap G can be recognized. However, tail part D and yoke A
An attractive force also acts between them, and this attractive force is opposite to the direction of the attractive force acting on the attracted part C of the armature B, so in the end, the extent of its contribution to the improvement of magnetic efficiency is not that great. be.

[Purpose of the invention] The present invention has been made in view of the above points, and its purpose is to provide an electromagnet device that can increase the attractive force of the armature and improve the magnetic efficiency.

[Disclosure of the Invention] The electromagnetic device of the present invention has an armature structure including an attracted part extending from a support point to one side of one leg of the yoke and a tail part extending to the opposite side. The yoke is characterized in that the tail portion is located at a position where, when the tail portion is attracted to one leg piece, a suction force in a direction superimposed on the suction force is received by the other leg piece of the yoke.

According to the present invention, leakage of magnetic flux is picked up by the tail part, and the attractive force acting between the tail part and the yoke can be superimposed on the attractive force of the armature, thus increasing the attractive force of the armature and improving magnetic efficiency. can be improved.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a yoke made of magnetic plate material, which includes opposing leg pieces 1a and 1b of approximately the same length and a connecting piece 1c that connects them.
It forms a U-shape. An end surface P1 of one leg piece 1a becomes an adsorption surface for an armature described later, and the other leg piece 1b
The end surface P2 becomes a support surface for an armature which will be described later.

A coil 2 is wound around one leg 1a of the yoke 1 via a coil frame 3.

Reference numeral 4 denotes an armature formed by bending a magnetic plate material, and a bent portion approximately in the middle thereof is supported so as to be angularly displaceable (hinge structure) on the end surface P2 of the other leg piece 1b. in this case,
A return spring (not shown) presses the armature 4 while biasing it. The armature 4 has a suctioned part 4a extending from the support point P3 toward the one leg 1a side, and a tail part 4b and a supporting bent part 4c that extend from the support point P3 to the side opposite to the suctioned part 4a. Be prepared. More specifically, the bent portion 4c is made approximately the same width as the yoke 1 and bent at an angle slightly larger than 90° with respect to the support point P3,
The tail portions 4b are arranged on both sides thereof, and are bent at an angle of approximately 90° with respect to the inner side of the support point P3 by approximately the thickness of the plate.

What is important here is that when the coil 2 is in the demagnetized state, as shown in FIG.
has a magnetic gap g between it and the end surface P1 of one leg 1a, the tail portion 4b is connected to the other leg 1.
This point is deviated toward one leg 1a from the position where it overlaps b. In other words, when the coil 2 is in an excited state and the attracted part 4a is attracted to the one leg piece 1a,
The suction force in the direction of superimposing the suction force on the other leg piece 1
The tail portion 4b is located at a position where it can be received by the tail portion 4b.

(Operation) In Figure 1, coil 2 is in a demagnetized state, and armature 4
is in the release (departure) position.

When the coil 2 is excited in this state, the magnetic flux is transferred from one leg 1a of the yoke to the connecting piece 1c and then to the other leg 1b.
→ Tail part 4b of armature → Attracted part 4a → Magnetic gap g → One leg piece 1a, so the attracted part 4a is attracted to one leg piece 1a, and the tail part 4b also superimposes the attraction force. In this direction, the armature 4 is attracted to the other leg 1b, and as a result, the armature 4 is angularly displaced and eventually attracted to the end surface P1, reaching the adsorption (contact) position. In this case, the tail portion 4b and the other leg piece 1b substantially overlap in side view.

Next, when the coil 2 is demagnetized, the magnetic flux disappears, so it returns to the release (separated) position.

Note that in the case of a polarized electromagnet device in which a permanent magnet is inserted into the yoke 1, the above operation is reversed. Further, the yoke 1 is not limited to one integrally formed of a magnetic plate material, and may be one having a separate fixed core crimped thereto, as long as it has a U-shaped portion. Furthermore, the opposing leg pieces 1a and 1b of the yoke 1 may have different lengths. Also, regarding the armature 4, the tail portion 4
It is also possible to arrange bending portions 4c for support on both sides of b at the center.

[Effects of the invention] The electromagnetic device of the present invention has an armature structure that includes an attracted part extending from a support point to one side of one leg of the yoke and a tail part extending to the opposite side. Since the tail part is located at a position where the attracting force in the direction superimposed on the attracting force is received by the other leg of the yoke when the yoke is attracted to one leg, the leakage of magnetic flux is absorbed by the tail. At the same time, the attractive force acting between the tail part and the yoke can be superimposed on the attractive force of the armature, thus increasing the attractive force of the armature and improving magnetic efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a sectional view of a conventional example, and FIG. 4 is an exploded perspective view thereof. 1... Yoke, 1a... One leg piece, 1b... Other leg piece, 2... Coil, 4... Armature, 4a...
Attracted part, 4b... Tail part, P1... End face of one leg piece, P2... End face of the other leg piece, P3... Support point, g... Magnetic gap.

Claims (1)

[Scope of utility model registration request] A yoke having a U-shaped portion, a coil wound around one leg of the yoke, and a coil supported by the other leg of the yoke so as to be angularly displaceable, and adsorbed to the one leg by controlling excitation of the coil. In the electromagnetic device including an armature, the armature includes an attracted part extending from a support point to one side of one leg, and a tail part extending to the opposite side, and the attracted part An electromagnetic device in which the tail portion is located at a position where an attraction force in a direction superimposed on the attraction force when being attracted to one leg piece is received by the other leg piece.