JPS6348169B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a polarized electromagnet.

In order to reduce the size of a conventional relay using a polarized electromagnet, the storage space for the permanent magnet placed between the yokes is set to be small. That is,
As shown in FIGS. 1 and 2, a permanent magnet 1 is formed into a rectangular shape, which is connected to a pair of U-shaped yokes 2,
The armature 3 is installed between the yokes 2 and 2 so that the magnetization direction is perpendicular to the opposing side surfaces of the yokes 2 and 2, and the armature 3 is installed between the yokes 2 and 2 above the yokes 2, with the center thereof as the fulcrum 3.
This armature 3 is arranged so as to be swingable as a.
A coil 4 is wound around the outside of the coil. The operation of this relay is such that when the coil 4 is de-energized, the N and S magnetic poles shown in the figure are generated at both ends of the yokes 2 and 2 due to the action of the permanent magnet 1, and the armature 3 is connected to one of the yokes 2 and 2. It is adsorbed to the side piece. On the other hand, when the coil 4 is energized so that the magnetization direction of the armature 3 is reversed, the armature 3 is repelled from one side piece of both yokes 2 and attracted to the other side piece. In this case, the permanent magnet 1 is a barium ferrite magnet having magnetic anisotropy in order to obtain a high attractive force.

However, in order to downsize the relay, the storage space for the permanent magnet 1 is reduced, so the length of the permanent magnet 1 in the magnetization direction cannot be increased, and as a result, a barium ferrite magnet is used as the permanent magnet 1. Despite using the magnetomotive force, a large magnetomotive force cannot be obtained, and the attraction force acting on the armature 3 is small.

Therefore, an object of the present invention is to provide a compact polarized electromagnet that can provide a large attractive force.

An embodiment of the present invention will be described with reference to FIGS. 3 to 9. That is, this relay using a polarized electromagnet uses a parallelogram-shaped permanent magnet 5 shown in FIG. 4 in place of the conventional rectangular permanent magnet 1 shown in FIG. 3. That is, this permanent magnet 5 is
A barium ferrite magnet having magnetic anisotropy, the direction of magnetization is parallel to a pair of opposing inclined sides 5a, and as shown in FIGS. 5 and 6, the magnetization direction is U-shaped as an example. It is attached between the yokes 2 so as to be inclined with respect to the opposing side surfaces of the yokes 2. This permanent magnet 5 is manufactured as follows.
That is, in the case of the conventional permanent magnet 1 shown in FIG. 3, as shown in FIG. 7, the full-size magnet 6 is cut along its magnetization direction J, that is, along the longitudinal direction a, and It was cut along the transverse direction b perpendicular to a, and the permanent magnet 1 was formed from this cut piece. However, as shown in FIG. 8, the permanent magnet 5 of this embodiment shown in FIG. It is cut along the inclination direction c inclined with respect to a, and the permanent magnet 5 is formed from this cut piece. The rest of the configuration of this relay is the same as that of the conventional example, so a description thereof will be omitted. As shown in FIG. 6, the armature 3 is inserted through a coil bobbin 7 and held so as to be swingable, and the coil bobbin 7 is fixed by placing its collar 7a on the bottom end of the yoke 2.

In this way, the magnetization direction of the permanent magnet 5 can be set by the yoke 2.
The permanent magnet 5
The length in the magnetization direction can be made larger than the distance between the yokes 2, 2. In other words, the magnetomotive force of the permanent magnet 5 can be increased while keeping the relay compact. The suction power can be increased. The relationship between the suction force and the armature stroke is shown in the 9th diagram.
As shown in the figure. In the drawings, curve A is the characteristic curve of the conventional example, and curve B is the characteristic curve of this embodiment. As can be seen from the figure, the suction force acting on the armature 3 of this embodiment is larger than that of the conventional example.

As described above, the polarized electromagnet of the present invention includes a pair of opposing yokes, a permanent magnet disposed between these yokes and whose magnetization direction is inclined with respect to the opposing surface of the yokes, and the yokes. An armature is provided between the yoke and the yoke, and a coil is provided around the outer periphery of the armature to excite the armature. It has the effect of being able to be made compact and increasing the attractive force of the permanent magnet.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional example, FIG. 2 is a perspective view thereof, FIG. 3 is a plan view of a permanent magnet used therein, FIG. 4 is a plan view of a permanent magnet used in an embodiment of the present invention, and FIG. 5 is a plan view of this embodiment, FIG. 6 is an exploded perspective view thereof, FIG. 7 is an explanatory diagram of a conventional method of manufacturing a permanent magnet, and FIG. 8 is an explanatory diagram of a method of manufacturing a permanent magnet of this embodiment. FIG. 9 is a diagram showing the suction force/armature stroke characteristics. 2... Yoke, 3... Armature, 3a...
Fulcrum, 4... Coil, 5... Permanent magnet.

Claims (1)

[Claims] 1 A pair of yokes facing each other, a permanent magnet disposed between these yokes and whose magnetization direction is inclined with respect to the facing surface of the yokes, and a direction in which the yokes face each other with the center as a fulcrum between the yokes. A polarized electromagnet comprising an armature that is swingably disposed on the armature, and a coil that is disposed around the outer periphery of the armature and that excites the armature.