JPS6216486B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polar electromagnet for miniature relays mounted in printed circuits, hybrid circuits, etc.

Generally, small relays use hinge-type electromagnets on which a movable iron piece is pivotally supported. In other words, a plunger-type electromagnet with a moving iron core that moves linearly can provide a large stroke and attractive force, but it was considered unsuitable for electronic circuits because of its large external dimensions, large inertia of the moving iron, and large impressed current. be. However, as relays have become smaller in recent years and become miniature relays with a side of several millimeters, problems arise such as variations in accuracy and wear of the hinge part of the hinged electromagnet, and the insulation distance between the coil and the contact part is small. , or the stroke of the movable iron piece is too small. The present invention has been made in view of the above points, and an object of the present invention is to provide a linear motion type polar electromagnet suitable for miniature relays.

The present invention will be explained in detail below with reference to embodiment figures. 1st
The figure shows the basic form of the present invention, in which two magnetic plates 1 and 2 of different lengths are arranged in parallel, and a center portion of both magnetic plates 1 and 2 is connected between the two magnetic plates 1 and 2. The two ends of the longer magnetic plate 1 are bent at right angles to connect the inner surfaces of the bent pieces 1a and 1b to the other magnetic plate 2. A U-shaped movable iron core with air gaps A and B formed between each end face 2a and 2b in the longitudinal direction, and whose central portion is inserted into an excitation coil 4 whose magnetic flux direction is parallel to both the magnetic plates 1 and 2. Both leg pieces 5a and 5b of No. 5 are connected to the above-mentioned spaces A and B
It is a bistable type polar electromagnet which is positioned inside the magnet and supports the movable iron core 5 so as to be slidable in the direction of the magnetic flux. In this embodiment, the longitudinal end surfaces 2a and 2b of the magnetic plate 2 are the outer surfaces of a bent piece obtained by bending both ends of the magnetic plate 2 at right angles toward the other magnetic plate 1. However, this is to increase the magnetic pole area of the end face when the magnetic piece 2 is formed of a thin iron plate, and of course, it may be formed of a thick iron plate and the cut end face may be used as the magnetic pole face.

In the embodiment shown in FIG. 2, the coil frame 6 of the excitation coil 4 is used as a sliding guide for the movable iron core 5. Or fixed to the case.

In addition, in the embodiment shown in FIG. 3, power is supplied to the excitation coil 4 using a flexible connecting lead wire 7, and the excitation coil 4 is fixedly attached to the movable iron core 5. It is integrally molded. In this case, the movable iron core 5 is the coil frame 6
guided by the body and the vessel.

Next, the operating state of the polarized electromagnet of the present invention will be explained with reference to the embodiment shown in FIG. 2. In FIG.
Both end surfaces 2a and 2b are N poles, and when the coil 4 is not excited, the magnetic flux by the permanent magnet 3 passes through a closed magnetic path passing through 2b → 5b → 5a → 1a, and the movable iron core 5 is in the state shown in the figure. It is held by suction. When the coil 4 is now excited so that the right side in the figure becomes the N pole, the right leg piece 5b of the movable iron core 5 becomes the right bent piece 1b of the magnetic plate 1, and the leg piece 5a becomes the bent piece 1a. are attracted to each other, reverse as shown in Figure b, and remain in the state shown even after the excitation current is removed. In this way, the direction of the excitation current can be alternately reversed in a predetermined direction.

The present invention is constructed as described above, and although the movable core moves in a straight line, the inertia of the movable core is hardly a problem for ultra-small polarized electromagnets.
Since there is no hinge part, the problems of wear and accuracy variations are solved, and the stroke of the movable core can be sufficiently large, and the contact spring can be driven at both ends of the movable core in the longitudinal direction, so the coil part This has the advantage that a large insulation distance can be maintained between the contact portion and the contact portion. It is also advantageous because it fixes a magnet block consisting of both magnetic plates and a permanent magnet, and allows the lightweight movable iron core to slide.In particular, as shown in Fig. 2, the movable iron piece is slidably supported within the coil frame. This will make the moving parts even lighter. Furthermore, integrating the coil and the movable core as shown in FIG. 3 has the advantage of reducing assembly man-hours and lowering costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing the basic form of the present invention, FIG. 2 is a cross-sectional view showing another embodiment, where a and b show operating states, and FIG. 3 is a schematic perspective view showing another embodiment. FIG. 1 and 2 are magnetic plates, 3 is a permanent magnet, 4 is an exciting coil, 5 is a movable iron core, 6 is a coil frame, and A and B are air gaps.

Claims (1)

[Claims] 1. Two magnetic plates of different lengths are arranged in parallel and the center portions of both magnetic plates are connected by a permanent magnet magnetized in a direction perpendicular to both magnetic plates. , both ends of the longer magnetic plate are bent at right angles to form a gap between the inner surface of the bent piece and each end face in the longitudinal direction of the other magnetic plate, so that the magnetic flux direction is Both legs of a U-shaped movable core whose central portion is inserted into an excitation coil parallel to the magnetic plate are positioned in each of the gaps, and the movable core is supported so as to be slidable in the direction of the magnetic flux. Features a polarized electromagnet. 2. A polarized electromagnet according to claim 1, wherein the coil frame of the excitation coil serves as a sliding guide for a movable iron core. 3. Claim 1, characterized in that power is supplied to the excitation coil by a flexible connection lead wire, and the excitation coil is fixedly attached to a movable iron core.
Polar electromagnet as described in section.