JPS6355202B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polarized electromagnet used in flat type relays and the like.

Conventionally, as a polarized electromagnet, as shown in FIG.
1, and between both arm parts 10b and 10c, N
-S-N and multi-pole magnetized permanent magnets 12, 12 are known. In this case, in order to achieve high sensitivity and to make the illustrated latching type single stable, the permanent magnets 12, 12 are connected by the hinge portions 13a, 13a.
Either a difference in area is created between the left and right suction parts 13b and 13c of the movable iron piece 13 that is swingably supported above, or
Or the arm portions 10b, 10c and the suction portion 13
It was necessary to provide a rangeal plate on one of the left and right opposing surfaces of b and 13c to create a difference in the suction force between the left and right sides. In other words, in conventional polarized electromagnets, compared to latching type ones,
There was a drawback that single stable type products had to be manufactured individually.

This invention was made to improve the above-mentioned drawbacks, and has the advantage of changing the latching type to the single stable type by making the contact area of the permanent magnet installed between the left and right yokes different between the left and right yokes. The purpose is to provide polar electromagnets.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1a shows an exploded perspective view of a polarized electromagnet according to the present invention, and FIG. 1b shows an assembled side view thereof. In these figures, 20 and 21 are a pair of U-shaped yokes, and the legs 20a and 20a and 21a and 21a of both yokes 20 and 21 are butted against each other with an air gap G held between them. Permanent magnets 22, 22 which are NS magnetized in the vertical direction are installed between the abutted ends, respectively.

23 is an H in which a coil 24 is wound around the central portion 23a.
Both arm portions 23b, 2 of this iron core 23 are
3c is arranged on the yokes 20 and 21.

25 is a square-shaped movable iron piece, and the left and right suction parts 25
Both arm portions 23b, 2 of the iron core 23 at a, 25b
The permanent magnets 22, 22 are swingably supported between auxiliary yokes 26, 26 provided on the upper surfaces of the permanent magnets 22, 22 at hinge parts 25d, 25d, which are opposite to the permanent magnets 3c and formed at the lower center of the arm parts 25c, 25c. ing. The center 27 of the permanent magnet 22 is the movable iron piece 2
It is shifted in one direction (to the left) with respect to the hinge portion 25d of No. 5. That is, the contact area between the permanent magnet 22 and the left and right yokes 20, 21 is set to be larger on the left side, as can be seen from the respective contact lengths _l1 , _l2 .

In the above configuration, when the coil 24 is not energized, the magnetic fluxes φ ₁ and φ ₂ of the permanent magnets 22 and 22 flow separately to the left and right yokes 20 and 21, and act as follows. That is, the magnetic flux φ ₁ entering the left yoke 20 from the permanent magnets 22, 22
0 to the left arm 23b of the iron core 23, the movable iron piece 25
It flows to the left adsorption part 25a, passes through the hinge parts 25d, 25d of the movable iron piece 25, and then flows to the permanent magnets 22, 22.
It comes down to. Furthermore, the magnetic flux φ ₂ that has entered the right yoke 21 flows from the right arm 23c of the iron core 23 to the left adsorption part 25a of the movable iron piece 25 via the central part 23a and the left arm 23b, and further flows to the left adsorption part 25a of the movable iron piece 25. , 25d, the permanent magnets 22, 22 return. As a result, the movable iron piece 25 is reversed to the left, and the arm portion 2 is placed on the left side of the iron core 23 at the suction portion 25a.
3b and becomes stable.

Next, the coil 24 is energized, and the coil 24 is
A magnetic flux φ _n is generated that flows in the opposite direction to the magnetic flux φ ₂ of the permanent magnets 22, 22 passing through the center of the magnet. Then,
The magnetic flux φ ₂ flowing through the right yoke 21 cannot pass through the central portion 23a of the iron core 23, and becomes a magnetic flux that attracts the right attracting portion 25b of the movable iron piece 25. Also,
The magnetic flux φ ₁ flowing through the left yoke 20 is the movable iron piece 2
5, the magnetic flux φ _n of the coil 24 is in the opposite direction and cannot pass through the movable iron piece 25 . That is,
φ ₁ is from the left arm part 23b of the iron core 23 to the central part 2
3a, the magnetic flux reaches the right arm 23c, and becomes a magnetic flux that attracts the movable iron piece 25 to the right arm 23c.
Therefore, when the coil 24 is energized and the movable iron piece 5 has completed its rotation, the paths of the magnetic flux φ _n of the coil 24 and the magnetic fluxes φ ₁ and φ ₂ of the permanent magnets 22 and 22 change as follows. First, the magnetic flux φ _n is transferred by the coil 24 from the central part 23a of the iron core 23 to the right arm part 2.
3c, the movable iron piece 25 is attracted to the right side, and the hinge parts 25d, 25d of the movable iron piece 25 → auxiliary yoke 2
6, 26 → Permanent magnet 22, 22 → Left yoke 2
0→The iron core 23 via the left arm 23b of the iron core 23
The result is a central portion 23a. Next, permanent magnet 2
Magnetic flux φ ₂ flowing from 2, 22 to the right yoke 21
is the movable iron piece 2 via the right arm 23c of the iron core 23.
5 on the right side, and attach the hinge part 25 of the movable iron piece 25.
d, 25d → return to the permanent magnets 22, 22 via the auxiliary yokes 26, 26. Furthermore, a permanent magnet 22,
The magnetic flux φ ₁ flowing from 22 to the left yoke 20 passes from the left arm portion 23b of the iron core 23 to the center portion 23a, attracts the movable iron piece 25 to the right side, and attracts the movable iron piece 25 to the hinge portions 25d, 25d of the movable iron piece 25 and the auxiliary yoke 26,
26 and returns to the permanent magnets 22, 22.

As mentioned above, when not energized, the permanent magnets 22, 22
The movable iron piece 25 is attracted to the left side by two types of magnetic fluxes φ ₁ and φ ₂ emitted from the left side yoke 20 and right side yoke 21, and when energized, the above two types of magnetic fluxes φ ₁ , emitted from the permanent magnets 22 and 22. The movable iron piece 25 is rotated and attracted to the right by three types of magnetic fluxes: φ ₂ and magnetic flux φ _n generated by energizing the coil 24 .

On the other hand, considering a latching type polar electromagnet in which the center 27 of the permanent magnetic fluxes 22, 22 is aligned with the hinge portion 25d of the movable iron piece 25, the difference in the attraction and adsorption force between the left and right sides of the movable iron piece 25 is the difference between the permanent magnet 22, 22
Whether the magnetic flux φ _n of the coil 24 is added to the magnetic fluxes φ ₁ and φ _{2 of}
The only difference is whether it joins or not.

In order to convert the above-mentioned latching type into a single stable type, it is necessary to provide a difference in attraction and adsorption force between the left and right sides in addition to the magnetic flux φ _n of the coil 24.

In the above configuration, the attraction force on the left and right sides of the movable iron piece 25 is made to differ not only by the difference between the left and right adsorption surfaces of the movable iron piece 25 or the presence or absence of a residial plate, but also by the placement location of the permanent magnets 22, 22. Single stabilization is possible. That is, there are two types of magnetic flux of the permanent magnets 22, 22: magnetic flux φ ₁ passing through the left yoke 20 and magnetic flux φ ₂ passing through the right yoke 21, but the magnetic flux φ 2 passing through the right yoke 21 is the magnetic flux of the iron core 23 that makes a large contribution to attraction and attraction. The magnetic flux φ ₁ forms a short magnetic path without passing through the central portion 23a. Therefore, if the contact area between the permanent magnet 22 and the left and right yokes 20, 21 is made different as shown in FIG. 1b, and the contact area between the left yoke 20 and the permanent magnet 22 is made larger than that on the right side, φ ₁ > φ ₂ , and the case where the magnetic flux φ ₁ passing through the left yoke 20 forms a short magnetic path (in the case of the attracted state in FIG.
(If it rotates to the right and attracts it), the suction and suction power will be greater, and single stabilization will be possible.

As a method of creating a difference in the contact area between the permanent magnet 22 and the left and right yokes 20, 21, the method shown in FIG. 1a,
In addition to the method shown in FIG. 1b, there is also a method shown in FIG. That is, the center 27 of the permanent magnet 22 is made to coincide with the hinge part 25d of the movable iron piece 25, and the leg lengths L ₁ and L ₂ of both yokes 20 and 21 are changed to each other so that the contact surface between the permanent magnet 22 and the yokes 20 and 21 is adjusted. , one yoke 20 side is made larger than the other yoke 21 side.

As shown in FIGS. 3a and 3b, in order to ensure the thickness of the permanent magnet 22 and the auxiliary yoke 26, the yokes 20 and 21 can be provided with stepped portions 20b and 21b. Further, as shown in FIG. 4, instead of the H-shaped core 23, a rod-shaped core may be used.

In each of the above embodiments, the upper surface of the auxiliary yoke 26 is made flat and the hinge portion 25d of the movable iron piece 25 is brought into contact with the flat surface.
As shown in FIG. 5b, the upper surface of the auxiliary yoke 26 is formed into a convex part, and the top part is attached to the hinge part 2 of the movable iron piece 25.
5d. In the above embodiment, an example was explained in which an auxiliary yoke was interposed between the permanent magnet and the hinge part of the movable iron piece, but this auxiliary yoke was omitted and the central part of the movable iron piece was Needless to say, the same effect can be obtained even if the support is directly supported by a hinge.

As can be seen from the above description, according to the present invention, by making the contact area of the permanent magnet installed between the left and right yokes different between the left and right yokes, the latching type can be changed to a single stable type. Electromagnets can be provided.

[Brief explanation of the drawing]

FIG. 1a is an exploded perspective view of a polarized electromagnet according to an embodiment of the present invention, FIG. 1b is an assembled side view thereof,
FIG. 2 is a side view showing another embodiment of the invention, FIGS. 3a and 3b are a perspective view and a side view showing a modification of the yoke, and FIG. 4 is a perspective view and a side view showing a modification of the iron core. 5a and 5b are a perspective view and a side view showing a modified example of the auxiliary yoke, and FIG. 6 is a perspective view of a conventional example. 20, 21... Yoke, 20a, 21a... Leg, G... Air gap, 22... Permanent magnet, 2
3... Iron core, 24... Coil, 25... Movable iron piece, 25d... Hinge part, 26... Auxiliary yoke,
27...Center.

Claims (1)

[Claims] 1. An iron core around which a coil is wound, and legs that abut both ends of the iron core, extend in the axial direction of the coil, and are disposed on both sides of the iron core to form an air gap with each other. A pair of U-shaped yokes held and butted against each other, a permanent magnet installed between the butt ends of the legs of both yokes to short-circuit the air gap, and a central portion hinge-supported on the permanent magnet. A polar electromagnet comprising: a movable iron piece having both ends swingably disposed on both yoke sides. 2 The center of the permanent magnet is displaced in one direction with respect to the hinge portion of the movable iron piece, and the contact area between the permanent magnet and the yoke is wider on one yoke side than on the other yoke side. The polar electromagnet described in item 1. 3 Align the center of the permanent magnet with the hinge part of the movable iron piece, and change the length of the legs of both yokes to make the contact area between the permanent magnet and the yoke wider on one yoke side than on the other yoke side. A polar electromagnet according to claim 1 comprising: 4 Claims in which an auxiliary yoke is interposed between the permanent magnet and the hinge portion of the movable iron piece, the upper surface of the auxiliary yoke is formed into a convex shape, and the top surface of the convex portion serves as the hinge portion of the movable iron piece. The polar electromagnet according to item 1, item 2, or item 3. 5 An auxiliary yoke is interposed between the permanent magnet and the hinge portion of the movable iron piece, the upper surface of the auxiliary yoke is formed flat, and a convex hinge portion that comes into contact with the flat surface is formed on the movable iron piece. Claim 1
2. The polar electromagnet according to item 2, item 3, or item 3.