JPS5934966Y2 - solenoid - Google Patents

Description

[Detailed description of the invention] This invention relates to a polarized solenoid using a permanent magnet.

There is a polarized solenoid using a permanent magnet that is operated by bias and then maintains its operating state even if the bias is released.

Conventionally, as shown in FIG. 1, this type of solenoid has movable and fixed iron cores 2 and 3 provided in the hollow part of a cylindrical excitation coil 1 so as to be able to move toward and away from the excitation coil 1, and a permanent magnet 4 adjacent to the excitation coil 1. A yoke 5 is provided to surround the excitation coil 1 and the permanent magnet 4, and the yoke 5 has a small diameter portion 22 formed in the movable core 2 via a stepped portion 21. be.

In such a case, when the excitation coil 1 is energized, the movable iron core 2
is attracted to the fixed iron core 3, and even if the excitation coil 1 is subsequently deenergized, the magnetic flux of the permanent magnet 4 self-maintains this attracted state, and in this state, the excitation coil 1 is energized in the opposite direction to the above-mentioned direction. When the movable core 2 and the fixed core 3 are released from adhesion, the stepped portion 21 of the movable core 2 comes into contact with the yoke 5 due to the biasing force of the load (not shown).
Even after the excitation coil 1 is released from the excitation coil 1, this state is self-maintained by the magnetic flux of the permanent magnet 4, so that so-called bistable operation can be achieved.

However, with such a configuration, the operating stroke of the movable core 2 is determined in advance between the abutting position of the stepped portion 21 and the yoke 5 and the abutting position of the fixed core 3, so the range of use is limited. Therefore, if different operating strokes are required, separate operating strokes must be prepared separately, which is extremely disadvantageous economically.

However, since the contact area between the stepped portion 21 of the movable core 2 and the yoke 5 is not very large, the holding force in this state is not very large, and the stability in this state is affected, especially in terms of vibration resistance. There are some disadvantages as well.

Furthermore, since the movable core 2 has a special shape in which one end is formed with a small diameter 22, there is a drawback in that it is troublesome to manufacture.

This invention was made to eliminate the above-mentioned drawbacks, and the object is to provide a polarized solenoid that can obtain an arbitrary operating stroke and also provide a stable holding force.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 2, 11 is a cylindrical bobbin, and an exciting coil 12 is wound around this bobbin 11.

A fixed iron core 13 is fitted into one open end of the bobbin 11, and a movable iron core 14 is inserted through the other open end of the bobbin 11 so as to be able to move toward and away from the fixed iron core 13.

A permanent magnet 15.15 is provided adjacent to the excitation coil 12.

In this case, the permanent magnets 15.15 are arranged with the polarities shown so as to magnetize the movable iron core 14.

A yoke 16 is provided to surround the exciting coil 12.

In this case, the fixed iron core 13 and permanent magnets 15, 15 are attached to the yoke 16.

The yoke 16 of the octopus is provided with a lid 17 made of a non-magnetic material and having a hole 171 through which the movable iron core 14 projects.

The yoke 16 is provided with an L-shaped auxiliary yoke 18.

This yoke 18 serves as a stopper that can be brought into contact with the end face of the movable core 14 so as to restrict the movement of the movable core 14 in the right direction in the figure, that is, in the direction in which it separates from the fixed core 13.

Further, the auxiliary yoke 18 has a structure in which the attachment portion to the yoke 16 can be moved in the movable direction of the movable iron core 14, so that the operating stroke of the movable iron core 14 can be adjusted.

In this case, the attachment part of the auxiliary yoke 18 is formed with a long hole 181 along the movable direction of the movable iron core 14 on the auxiliary yoke 18 side, and is fixed to the yoke 16 side with a screw 19 through this long hole 181. do it.

Of course, the configuration of this attachment portion may be other configurations.

Next, the operation of the solenoid constructed as above will be described.

Assuming that the movable iron core 14 is now in contact with the auxiliary yoke 18 as shown in FIG. 2, in this state the permanent magnet 15
, 15 magnetic flux is transferred to the yoke 16 → auxiliary yoke 18 → movable iron core 14
The movable iron core 14 is attracted to and held by the auxiliary yoke 18.

In this case, since the end face of the movable iron core 14 is brought into contact with the auxiliary yoke 18, a relatively large contact area can be obtained at this time, and a large holding force can be obtained in this state.

From this state, when the excitation coil 12 is energized and the movable iron core 14 and the fixed iron core 13 are magnetized, the movable iron core 14 becomes the fixed iron core 1.
3 and moved to the left in the figure, and is attracted to the fixed iron core 13.

When the excitation coil 12 is deenergized in this state, the magnetic flux of the permanent magnets 15, 15 is transmitted through the yoke 16, fixed iron core 13, and movable iron core 14, so that the movable iron core 14 is maintained in this state.

Next, when the excitation coil 12 is energized in the opposite direction to that described above, the movable core 14 is magnetized to the same polarity as the fixed core 13, so the attraction force during this time is canceled, and the movable core 14 is thereby biased by the biasing force of an external load (not shown). As shown in the figure, move the auxiliary yoke 1 to the right.
8 and returns to the state shown in FIG. 2.

By repeating the energization of the excitation coil 12 in the same manner as described above, bistable operation is obtained in the movable iron core 14.

Therefore, with this configuration, the operating stroke of the movable iron core can be adjusted by adjusting the mounting position of the auxiliary yoke, which not only expands the range of use compared to conventional models with fixed operating strokes, but is also extremely advantageous economically. be.

In addition to this, the end face of the movable core contacts the auxiliary yoke over a relatively large area when separated from the fixed core, and is attracted to the auxiliary yoke in this state, increasing stability in this state. Good bistable operation can be expected, including significantly improved vibration resistance.

Furthermore, by removing the auxiliary yoke, the solenoid can be made into a monostable solenoid, so this invention has the advantage that a general monostable solenoid can be easily made into a bistable solenoid.

In addition, there is no need to provide a small diameter part on the movable core as in conventional ones, so there is an advantage in terms of manufacturing.

It should be noted that this invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications without changing the gist.

As described above, according to this invention, it is possible to provide a polarized solenoid which can obtain an arbitrary operating stroke and also obtain a stable holding force.

[Brief explanation of the drawings] Fig. 1 is a vertical cross-sectional view showing an example of a conventional solenoid;
The figure is a longitudinal sectional view showing an embodiment of this invention. DESCRIPTION OF SYMBOLS 1...-Excitation coil, 2...Movable iron core, 21...Step part, 22...Small diameter part, 3...Fixed iron core, 4...Permanent magnet, 5...Yoke, 11 ...Bobbin, 12...
Exciting coil, 13... Fixed iron core, 14... Movable iron core, 15... Permanent magnet, 16... Yoke, 17... Lid body, 18... Auxiliary yoke, 181... Hole, 19...screw.

Claims (3)

[Scope of utility model registration request] (1) A cylindrical excitation coil, a fixed iron core and a movable iron core that are provided in the hollow part of this coil so as to be able to move toward and away from the coil,
a yoke provided to surround the excitation coil; a permanent magnet having one polar end attached to the yoke and magnetizing the movable iron core to the other polarity; A solenoid comprising: an auxiliary yoke that is movable in the direction of the movable iron core and that is capable of coming into contact with an end face of the movable iron core so as to restrict the movement of the movable iron core in a direction in which the movable iron core separates from the fixed iron core. . (2) The auxiliary yoke has a long hole along the moving direction of the movable iron core, and is attached to the yoke through the long hole. Solenoid. (3) The solenoid according to claim 1 or 2, wherein the auxiliary yoke is L-shaped.