JPH019132Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention causes the movable connecting member to move in a straight line and reciprocate by electromagnetic action to perform two operations.
This relates to a reciprocating self-holding type DC solenoid that is self-holding in a non-energized state in any operating state.

As shown in FIG. 1, in a conventional DC solenoid, a movable iron core 2 within an excitation coil 1 is
the suction action that is drawn into the yoke tube 3 when energized;
Some devices combine the repulsion effect due to the repulsion force of the spring 4 when no current is applied.

However, in the solenoid shown in Fig. 1, only the electromagnetic attraction force acts against the repulsive force of the spring 4, and only the difference between the input electrical energy and the repulsive force of the spring 4 is converted into kinetic energy. In addition, in order to maintain the magnet in the attracted state, it must be continuously excited, which naturally requires electric power, and consideration must also be given to heat generation during this time. Furthermore, since a spring is used, the service life is short and stability is poor.

The present invention provides a solution to the above-mentioned drawbacks, and provides a small reciprocating self-holding type DC solenoid in which a movable connecting member is operated twice by an excitation coil and is self-maintained in a non-excited state. For this purpose, one embodiment will be explained in detail with reference to FIGS. 2A and 2B and FIG. 3. Reference numeral 5 denotes a movable connecting member made of a non-magnetic material and provided so as to surround an excitation coil 6. The excitation coil 6 is electrically connected to a DC power source E having a polarity switching means T (see FIG. 3). Permanent magnets 7 and 8 are respectively fixed to the movable coupling member 5 at both ends of the movable coupling member 5 with a distance from the excitation coil 6;
For example, it is made of an anisotropic ferrite magnet, and is magnetized with the polarity shown. Reference numerals 9 and 9' denote buffer plates made of a magnetic material, 10 a fixed yoke plate made of a magnetic material, and 11 a substrate made of an insulating material;
As shown in the figure, an excitation coil 6 is fixed to the center of the movable connecting member 5, and the movable connecting member 5 is slidably attached to both ends.
Permanent magnets 7, 8 fixed to are disposed.
2A and 2B are examples in which the movable connecting member 5 is configured to surround the outer surfaces of the permanent magnets 7 and 8, and the outer surface of the permanent magnet 7 and the movable connecting member 5 on the right side of the figure are The gap formed by one side can be used, for example, as a mounting means for inserting and locking a connecting portion of a connecting device (not shown).

To explain the operation of the reciprocating self-holding type DC solenoid having the above-mentioned configuration, when the current is not energized, the permanent magnet 7 disposed on the right side of the figure, which is fixed to the movable connecting member 5 as shown in the figure, moves. , considering the state in which the excitation coil 6 is attracted to the fixed yoke plate 10 via the buffer plate 9, the magnetic flux density of the permanent magnet 7 disposed on the right side and the permanent magnet 8 on the left side in the figure with respect to the excitation coil 6 is The magnetic flux density of the right permanent magnet 7 that is attracted to the excitation coil 6 is larger than the magnetic flux density of the left permanent magnet 8, and the attractive force is proportional to the square of the magnetic flux density, so the attracted state is Maintained stably.

Then, when a current from the DC power source E (see FIG. 3) is applied to the excitation coil 6 so as to drive the movable connecting member 5 in the direction of the left permanent magnet 8, the second
Magnetic flux is generated in the direction of the dashed arrow in the figure. This magnetic flux cancels out the magnetic flux generated from the right permanent magnet 7, causing the excitation coil 6 and magnet 7 to repel each other, but the magnetic flux generated from the left permanent magnet 8 is canceled out by the excitation coil 6. The magnetic flux generated by this and the superimposed magnetic flux density increase the attractive force, and the left permanent magnet 8 fixed to the movable connecting member 5 slides on the substrate 11 and is attracted in the direction of the excitation coil 6. and is attracted to the excitation coil 6 via the buffer plate 9'. The magnetic path during this energization is the central axis of the excitation coil → upper fixed yoke plate → upper buffer plate → permanent magnet → lower buffer plate → lower fixed yoke plate, and the magnetic fluxes of the excitation coil 6 and the left permanent magnet 8 are superimposed. The suction power is strong. Furthermore, the movable and fixed yoke plates surrounding the excitation coil 6 reduce leakage of magnetic flux to the outside of the permanent magnet, resulting in very high magnetic efficiency. Even if the excitation coil 6 is no longer energized, the attracted state is maintained by the magnetic flux of the permanent magnet 8, as described above. Furthermore, it is clear that when a current is applied in the opposite direction to the excitation coil 6, the movable connecting member 5 is driven in the opposite direction and is stably held even when the excitation is stopped.

In this way, in the DC solenoid of the present invention, by changing the direction of the current flowing through the excitation coil as described above, the movable connecting member 5 and the permanent magnets 7 and 8 can be linearly moved back and forth in both directions. At the same time, even when the current is turned off after the operation and the magnet is not energized, it is self-retained by the permanent magnets disposed at both ends, and the following effects can be achieved.

(1) A reciprocating DC solenoid can be manufactured by simply changing the polarity of the DC flowing through the excitation coil.

(2) There is no need to consider power consumption, heat generation, etc. as it can self-maintain in a non-energized state.

(3) Since there is no fear of heat generation, the current density of the excitation coil can be increased, and since the movable connecting member slides on the outside of the excitation coil, the excitation coil can be made smaller, making it possible to downsize the solenoid.

(4) Long lifespan because no springs are used.

Furthermore, if the permanent magnets 7 and 8 are made of elastic material, the buffer plates 9 and 9' are unnecessary.

(5) Since one side of the movable connecting member can be used as a mounting means, various mounting methods can be supported and mounting stability is increased.

Note that the present invention is not limited to the above-mentioned embodiments,
It goes without saying that various modifications can be made without changing the gist.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional DC solenoid, Fig. 2 A is a sectional view showing an embodiment of the present invention, B is a plan view of the same, and Fig. 3 is a connection diagram with a driving DC power source. . 5...Movable connection member, 6...Exciting coil, 7,
8...Permanent magnet, 9,9'...Buffer plate, 10...
Fixed yoke plate, 11... board.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An excitation coil provided with a fixed yoke plate, a movable connecting member provided so as to surround the excitation coil,
Permanent magnets fixed to two sides of the movable connecting member sandwiching the excitation coil at a predetermined distance from the excitation coil, and a buffer plate fixed to the permanent magnets and forming a magnetic path with the fixed yoke plate. The movable connecting member slides the predetermined distance along the excitation coil due to the attractive force of the permanent magnet fixed to the movable connecting member, so that the excitation coil and the permanent magnet are connected to each other. A reciprocating self-holding DC solenoid that holds one side in an adsorbed state. (2) The reciprocating self-retaining DC solenoid according to claim (1), wherein the central axis of the excitation coil is arranged perpendicular to the sliding direction of the movable connecting member.