JPS6116661Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses a polarized solenoid, specifically, when a coil is energized and a plunger is attracted and moved, a permanent magnet is used to maintain the position of the plunger at that position even after the coil is de-energized. Concerning an internally incorporated type of polarized solenoid.

Conventionally, as this type of polarized solenoid, structures as shown in FIGS. 1 and 2, A and B, have already been proposed. That is, a cylindrical body 2 is provided in the center of the yoke 1, and a plunger 3 having a drive rod 3a that is exposed and protrudes from the outside is provided in the cylindrical body 2 so as to be movable up and down. A permanent magnet 4 is provided at the center of the outer periphery of the body 2, and coils 6, 6 are provided above and below the permanent magnet 4 via a coil frame 5.

When the coils 6, 6 are appropriately excited, an electromagnetic attractive force is generated, which attracts and moves the plunger 3, and after the excitation is turned off, the position to which the plunger 3 has moved is maintained by the action of the permanent magnet 4. In this case, the shape of the permanent magnet 4 may be rectangular, as shown in Fig. 2A, with a hole 4a formed in the center for inserting the cylindrical body 2, or, as shown in Fig. 2B, a square-bar-shaped magnetic material 4d, 4d is joined to both sides of a yoke 4c having a hole 4b in the center.

Therefore, when a permanent magnet having the former shape is used, molding costs are required, which increases the cost accordingly, and there are disadvantages in that anisotropic materials cannot be used and the holding force becomes weak. Furthermore, since the size of the permanent magnet in the latter type is smaller than that in the former type, there is a drawback that there is a limit to the holding force.

The present invention was proposed in view of the above points, and aims to provide a polarized solenoid with a large holding force because the size of the permanent magnet can be increased and an anisotropic magnet can be used. It comes out.

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

3 and 4 show an embodiment of the present invention, in which reference numeral 11 indicates magnetic legs 11 extending parallel to each other.
a and has a substantially U-shaped cross section, and a notch 11b is formed at the opening side of the first yoke 11, that is, at the tip of the magnetic leg 11a. The second yoke 12 is attached to the opening of the first yoke 11 so that the protrusion 12a of the plate-shaped second yoke 12 is inserted through the notch 11b to form a closed magnetic path. 13 is the first
A hollow part formed in the center of the yoke 11 of
A cylindrical plunger 14 is provided in the hollow portion 13 so as to be movable therein.
One end of a rod-shaped drive rod 14a is fixed to the center of the end face of the second yoke 12, and the other end of the drive rod 14a, that is, the tip thereof, protrudes to the outside through a hole 12b formed in the center of the second yoke 12. Cage, plunger 1
4 is activated, a mechanical output is applied to the outside via this drive rod 14a. 1
Reference numeral 5 denotes a rectangular third yoke provided on the outer periphery of the central portion of the hollow portion 13. A hole 15a is formed in the center of the yoke 15, and the plunger 14 is positioned within this hole 15a. It's becoming like that. 16 is the third yoke 15 and the first yoke 11
The coil is installed between the bottom 11b' of the yoke 11b' and the third yoke 15 and the second yoke 12 via a hollow cylindrical coil frame 17 having flanges at both ends. A plate-shaped permanent magnet 18 is provided, which has a rectangular shape and is magnetized, for example, as shown in the figure. That is, the protrusion 12c is provided on the side of the second yoke 12.
are formed, the S pole (one pole) of each permanent magnet 18 is joined to this protrusion 12c, and the N pole (other pole) of each permanent magnet 18 is joined to one side of the third yoke 15. A permanent magnet 18 is provided to short-circuit between the second and third yokes 12 and 15. Further, a protrusion 11 similar to that of the second yoke 12 is also provided on the bottom 11b' of the first yoke 11.
c is formed between the protruding parts 11c and 15 of the first and third yokes 11, and the joint part of the protruding part 11c of the first yoke 11 becomes the S pole, and the joint part of the protruding part 11c of the first yoke 11 becomes the S pole, and
A magnetized permanent magnet 18 is provided at the N pole of the joint.

To explain an example of the operation, if a current in an appropriate direction is applied to each coil 16 and the right end of the plunger 14 is magnetized to the S pole and the left end to the N pole in the state shown in the figure, an attractive repulsive force will be generated. If the plunger 16 is de-energized, one side (left side in the figure)
Due to the action of the permanent magnets 18, 18, the plunger 1
4 is held at the position.

It goes without saying that even if the polarity of the permanent magnet 18 is reversed in FIG. 4, the same effect as described above will occur.

As described above, in the present invention, unlike the conventional example, the position of the plunger is maintained by a pair of plate-shaped permanent magnets provided on the upper and lower sides of each coil.
Since it does not require a mold as in the conventional example shown in Fig. A, the cost increase can be suppressed, and the size can be made larger than the conventional one shown in Fig. 2B. Moreover, since anisotropic magnets can be used, the holding force can be increased. Therefore, the plunger can be held securely even when subjected to external shocks, and stable operation can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional solenoid, FIG. 2 A and B are permanent magnets used in the conventional example, and FIGS. 3 and 4 are examples of a polarized solenoid according to the present invention. Figure 3 is a perspective view, Figure 4
The figure is an explanatory cross-sectional view of the same as above. DESCRIPTION OF SYMBOLS 11...First yoke, 12...Second yoke, 13...Hollow part, 14...Plunger, 15
...Third yoke 16...Coil, 17...Coil frame, 18...Permanent magnet.

Claims (1)

[Scope of utility model registration request] A first yoke with a substantially U-shaped cross section having two magnetic legs, a second yoke provided at the tip of the magnetic legs of the first yoke, and a hollow portion formed in the first yoke. a plunger movable between both ends and having a drive rod protruding to the outside; a hole through which the plunger passes is formed in the center;
a third yoke provided in the center of the yoke;
A second coil is provided on the left and right sides of the third yoke, and within which the plunger moves within the center;
are provided to bridge the lower parts of the yoke and the third yoke, and the third yoke and the first yoke, respectively, and the joints with the second and first yokes are connected to one pole, and A polarized solenoid comprising a permanent magnet whose joint part with a third yoke is magnetized to the other pole.