JPS5845801B2 - electromagnetic response device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electromagnetic response device.

Conventionally, in this type of device, a movable magnetic core B that is movable in the axial direction is inserted into the inner periphery of a coil A, as shown in FIG. 1, and the movable magnetic core B is moved by energizing the coil A. , a device that moves a controlled member C connected thereto is known.

In this case, when the applied current is constant, the force F changes as the moving distance of the movable magnetic core B changes, as shown in Fig. 2, and the smooth movement control of the breakable member C is prevented. There were flaws that could not be avoided.

The object of the present invention is to provide a device that eliminates such drawbacks, and in a device in which a movable magnetic core 2 that is movable in the axial direction of the coil is inserted into the inner circumference of the coil,
The coil is divided into coils 1a and 1b which are connected in series with an interval in the axial direction so that the two magnetic fluxes are added to each other.
A ring-shaped ferrite-based permanent magnet 3 magnetized to the S pole is inserted, and the permanent magnet 3 and the above-mentioned bipolar coil Ia,
a yoke 4 that surrounds the movable magnetic core 2 from the outer periphery, and yokes 5a and 5b that extend from both ends of the yoke 4 toward both ends of the movable magnetic core 2.
and tapered portions 2a at both ends of the movable magnetic core.
, 2b are provided.

In FIG. 3, the permanent magnet 3 is made of a magnetic material with high coercive force, such as strontium ferrite.

Reference numerals 6a and 6b designate supporting frames on both sides of the movable magnetic core 2 movably supported by shaft rods 7a and 7b protruding from both ends thereof, and reference numerals 8, 8, . . . both support frames 6a.

The receiver provided at 6b is a ball.

The left end shaft rod 7a is made to protrude from the left support frame 6a, and a controlled member (not shown) is connected to the tip thereof.

Here 1. When a current is applied to the split coils la and lb in one direction, the movable magnetic core 2 is moved from the position shown by the solid line in FIG. 3 toward the point curb position, and the left end shaft rod 7a is Force F acts.

At this time, the force F remains constant regardless of changes in the moving distance of the movable magnetic core 2 under certain conditions, as shown in Figure 4, and as shown in Figure 5, depending on changes in the current. Current ■
increases in proportion to

If the current is applied in the opposite direction to the above, the movable magnetic core 2 will have a third
The movement from the plot point curb to the position indicated by the solid line is given.

The characteristics shown in FIGS. 4 and 5 will be explained in detail as follows.

That is, when coils la and lb are energized and current i flows,
A magnetic flux φC shown by the dotted line in FIG. 6 is generated, but the movable magnetic core 2
The same amount of magnetic flux enters and exits at both ends of the movable magnetic core 2, cancels each other out at both ends of the movable magnetic core 2, and has almost no effect on the force F acting on the shaft rod 7a.

Further, the ferrite permanent magnet has a property that it is not affected by an external magnetic field, and does not pass the magnetic flux caused by the coils la and 1b.

Therefore, it is the magnetic flux φM caused by the permanent magnet 3 that is involved in the generation of the force F.

Now, when a current i is passed through the coils 1a and 1b and the movable magnetic core 2 is moved, if the movable magnetic core 2 moves dL to the left in FIG. Magnetic flux φM1 increases by dφ, and coil 1b
On the side, the magnetic flux φM2 due to the permanent magnet 3 decreases by dφM.

Therefore, the amount of change in magnetic flux is 2dφM.

If the total number of turns of coils la and 1b is N, then coil 1
The induced electromotive force e generated in a and 1b is this electric energy W
Since the movable magnetic core 2 receives the force F and moves by dL, the force F becomes constant and the equation shown in FIG. 4 holds true.

In the present invention, tapered portions 2a, 2 are provided at both ends of the movable magnetic core.
This was achieved by providing b.

That is, the total magnetic flux φM1+φM2 of the permanent magnet 3 is constant regardless of the movement of the movable magnetic core 2, and as shown in the first diagram, <LL+
L2 is also constant regardless of the movement of the movable magnetic core 2.

The magnetic fluxes φM1 and φM2 are the opposing areas πDL1 and πDL2 between the yokes 5a and 5b and the tapered portions 2a and 2b of the movable magnet 2.
is proportional to.

This facing area πDL+・πDL2 is directly proportional to dL. Therefore, by providing the tapered portions 2a and 2b at both ends of the movable magnetic core 2, it is possible to generate a force F regardless of the movement of the movable magnetic cores 1L and 2. I can do it.

As described above, according to the present invention, both ends of the movable magnet I and 2 can be connected, so from the equation for F, the force F and the current i are linearly proportional, and FIG. 5 holds true. .

In this way, according to the present invention, the force acting on the movable magnetic core is changed in proportion to only the current flowing to the coils on both sides, regardless of the change in the moving distance, by having the structure as described above. This has the effect of smoothly controlling the movement of the controlled member.

[Brief explanation of the drawing]

Fig. 1 is a cut side view showing a conventional example, Fig. 2 is a diagram showing its characteristics, Fig. 3 is a cut side view of an example of the device of the present invention, and Figs. 4 and 5 respectively show its characteristics. The diagrams shown in FIGS. 6 and 7 are manual explanatory diagrams thereof, respectively. la, 1b...Coil, 2...Movable magnetic core, 3...Permanent magnet, 4...Yoke,
5a, sb...Yoke 0

Claims (1)

[Claims] 1 In a type in which a movable magnetic core is inserted into the inner circumference of a coil so as to be movable in the axial direction, the coils are connected in series with an interval in the axial direction so that two magnetic fluxes are added to each other. A ring-shaped ferrite permanent magnet which is divided into coils and is magnetized to the north and south poles in the radial direction is inserted between the two distribution coils, and a yoke that surrounds the permanent magnet and the two distribution coils from the outer periphery. , a yoke extending from both ends toward both ends of the movable magnetic core, and further provided with tapered portions at both ends of the movable magnetic core.