JPS5810336Y2 - Magnetizer for circulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetization device, and particularly to a magnetization device that can continuously change the strength of a magnetic field applied to a magnetic material.

Generally, to magnetize a magnetic material, a magnetic material 4 is inserted into a gap 3 of a magnetization device consisting of magnets 1a and 1b, a yoke 2, and a gap 3, as shown in Fig. 1. However, there are variations in the characteristics of the magnetic body 4 to be magnetized, the strength of the magnets 1a and lb, etc., and it is sometimes desirable to change the strength of the magnetic field applied to the magnetic body 4.

Fig. 2 is a diagram in which the magnetization device shown in Fig. 1 is converted into an electric circuit, where Rg is the magnetic resistance of the air gap 3 between the magnets 1a and lb, Em is the magnetomotive force of the magnets 1a and lb, and Ig is the magnetic field in the air gap 3. It is strength.

In order to change the magnetic field strength Ig, if the magnetomotive force Em is constant, the magnetic resistance Rg may be changed.

That is, the size d of the void 3 may be changed.

There are various mechanisms for changing the size d of the void 3.

For example, as shown in FIG. 3a, there is a device in which a magnet 1a is attached to a screw 5 and the magnet 1a is moved through a screw hole 6 to change the size d of the air gap 3.

In addition, in the figure, a non-magnetic material 7 supporting one of the magnets 1a is provided between the magnet 1b, and a spacer 8 made of a magnetic material with an appropriate thickness is arranged between the magnet 1a and the non-magnetic material 7. This changes the size of the void.

Furthermore, C in the same figure shows that another parallel magnetic path magnetic body 9 is connected to the air gap.
The strength of the magnetic field of the main circuit is adjusted by changing the magnetic resistance of the magnetic field.

However, although the structure shown in FIG. 3a allows the strength of the magnetic field to be changed continuously, it has a complicated structure and requires screw parts, and depending on the structure, the yoke 2 may become a hindrance, making adjustment difficult.

Furthermore, although the structure shown in the same figure is simple, it has the disadvantage that it can only adjust the magnetic field discontinuously and cannot make delicate adjustments.

Furthermore, the device shown in FIG. C has the disadvantage that although the magnetic field of the main circuit can be weakened, it cannot be strengthened.

The present invention was developed to eliminate the above-mentioned drawbacks.The yoke that forms the magnetic path is divided into multiple parts, some of which are overlapped, and the overlapped parts are aligned in the same direction as the air gap without separating them. The magnetic field in the gap is adjusted by moving parallel to the direction.

The present invention will be explained below with reference to the drawings.

FIGS. 4a and 4b are a perspective view and a sectional view of a magnetization device according to an embodiment of the present invention.

Parts in the figure that are the same or equivalent to those in Figures 1 and 3 are given the same numbers.

Reference numeral 10.11 denotes a yoke divided into two parts, each having an L-shape and arranged so that the L-shapes face each other, and magnets 1a and lb for supplying a magnetic field to the air gap 3 are attached to the opposing surfaces.

A groove 12 or a screw hole 13 is formed at the other end of the L-shape of the yoke 10, 11 where the magnet is not attached.

While aligning the groove 12 and the screw hole 13, the yoke 10 or 11 is moved in parallel in the three directions of the air gap, and the magnets 1a, 1 are attached.
Adjust the size of the gap 3 between b to obtain the desired strength of the magnetic field, and then tighten the screw 14 into the screw hole 13 to fix both yokes 10 and 11 so that they do not move due to vibration or the like. Become.

In addition, 4 in the figure is a magnetic body to be magnetized.

The magnetization device of the present invention configured as described above has the following effects.

(1) Continuous and delicate magnetic field adjustment is possible.

(2) The magnetic field can be adjusted in either strong or weak directions.

(3) The above-mentioned adjustment operations are easier and the structure is simpler than the conventional ones.

In the above embodiment, the magnet is attached to the yoke, but as shown in FIG. 5, gaps 3b and 3C may be formed between the yoke 10.11 and the magnets 1a and lb.

That is, by changing the size of the gap 3b formed by the yoke 10 and the magnet 1a or the gap 3C formed by the yoke 11 and the magnet 1b, without changing the size of the gap 3a into which the magnetic body 4 is inserted, the size of the gap 3a is changed. It changes the strength of the magnetic field.

Note that 7 is a non-magnetic material for attaching and fixing the magnets 1a and lb.

FIG. 6 shows an example in which the present invention is applied to a microwave circulator, where 10.11 is a yoke divided into two parts, and 1a.

1b is a magnet, 15 is a waveguide, and 16 is a ferrite placed in the waveguide to be magnetized.

14 is a screw for fixing the yoke after adjusting the magnetic field.

As described above, according to the present invention, it is possible to obtain a magnetizing device that has an extremely simple structure and can easily and continuously adjust the magnetic field.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a general magnetizing device, Fig. 2 is an electrical equivalent circuit diagram of Fig. 1, Fig. 3 a, l), c is a diagram showing a conventional magnetizing device, Fig. 4 a, 1) is a perspective view and a sectional view of a magnetizing device according to an embodiment of the present invention, FIG. 5' is a diagram showing another embodiment, and FIG. 6 is an example in which the present invention is applied to a microwave circulator. . la, lb... Magnet, 3... Air gap, 4
...Magnetic material, 10゜11...Yoke,
12...Groove, 13...Screw hole, 14.
·····screw.

Claims (1)

[Scope of utility model registration request] In a magnetizing device that has a magnet, a yoke, and a gap, these form a magnetic closed circuit, and a magnetic body is placed in the gap to magnetize the magnetic body, the yoke has at least two
The size of the gap can be adjusted by overlapping some of the divided yokes and changing the amount of overlapping, and has means for maintaining and fixing this overlapping state. A magnetizing device characterized by: