JPH11297527A - Apparatus for lifting magnet at normal temperature - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably lift a magnet in the air by generating repulsive force between the magnet and a conductor by using an eddy current which is generated in the conductor by moving the magnet and the conductor relatively to each other. SOLUTION: When a magnet 3 is made to approach conductive rotors 1 and 2 which are rotating at a high speed, an eddy current is produced in the rotors 1 and 2 by electromagnetic induction, thus generating force in a direction repulsive to the magnet 3, placed at the center between the rotors 1 and 2 from the rotational direction. Arranging the rotational axes of the rotors 1 and 2 in parallel to the axis of the magnetic pole of the magnet 3 at this time generates repulsive forces F1 and F2 between the magnet 3 and the rotating rotors 1 and 2, which repel each other. If the two rotors 1 and 2 are rotating at the same speed, the repulsive forces F1 and F2 become equal to each other. Those forces act on the magnet 3 in directions perpendicular to each other, so that when the gravitational force G is balanced with the repulsive forces F1 and F2, the magnet 3 stably stays in the air. The repulsive forces F1 and F2 increase in proportion to the strength of the magnetic force of the magnet 3. A rare earth magnet is used for such a magnet 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The technical field according to the present invention belongs to the field using electromagnetic induction of magnets.

[0002]

2. Description of the Related Art Conventionally, it was possible to float a magnet in the air in a closed space using repulsion of the magnet. For example, as shown in FIG. 1, a disk-shaped magnet is fixed on a plate with the N-pole facing up, and a long plastic hollow cylinder slightly larger than the diameter of the magnet is erected there. Then, a cylindrical magnet having the same diameter as the previous magnet is dropped into the cylinder with the N pole facing downward from above. Then, the cylindrical magnet floats in the air due to the repulsion of the magnetic force and stops. However, this only utilizes the repulsion of the magnet.

If a superconducting magnet is used, the floating phenomenon of the magnet can be easily realized. It is because superconducting magnets create very strong magnetic fields. However, if a superconducting magnet is to be used, the magnet must be cooled to near zero degrees, and a very large cooling device is required.

[0004]

In the prior art, there is a method of stably floating a magnet in the air using, for example, the repulsion of a magnet, but it is very difficult to balance the repulsion of the magnet. Was.

[0005] Further, the magnet floating phenomenon required a large-scale device such as a superconducting magnet requiring a cooling device.

[Means for Solving the Problems]

In the apparatus according to the present invention, a strong magnet and a conductor are used to stably float the magnet. The change in magnetic flux was increased by increasing the relative speed.

As a result, the magnet can be stably levitated in the air by balancing the large repulsive force between the magnet and the magnet generated by the eddy current induced in the conductor and the gravity acting on the magnet.

The levitation device according to the present invention does not use repulsion of magnets or superconducting magnets, so that the magnets can be easily levitated in an open space.

FIG. 2 shows a schematic diagram of an apparatus according to the present invention.
FIG. 2 shows a view of the apparatus viewed triangularly.

As shown in FIG. 2, high-speed rotation (10,00
When a magnet is brought close to a disk made of a conductor that is rotating (about 0 rpm), an eddy current is generated in the disk, which is a conductor, by electromagnetic induction, and the magnet 3 placed at the midpoint of the two disks from its rotation direction A force is generated in the direction of repulsion.

That is, the magnets and the rotating conductors 1 and 2
Between them, repulsive forces F1 and F2 are generated and repelled.

When the two rotating bodies (discs made of a conductor) are rotating at the same speed, the repulsive force F1,
F2 becomes equal. Then, they act on the magnet 3 at right angles to each other, and when the gravity G acting on the magnet and the repulsive forces F1 and F2 are balanced, the magnet 3 stably stops in the air.

Since the repulsive forces F 1 and F 2 are forces induced from the magnet, they increase in proportion to the strength of the magnetic force of the magnet 3.

That is, an eddy current obtained by a relatively weak magnetic force, such as a normal barium ferrite magnet or an alnico magnet, is also small, and the corresponding force (here, repulsive force with the magnet) is weak, and the magnet floats. I cannot do that.

A rare earth magnet is used to generate a force large enough to make the magnet levitate. For example, a neodymium magnet or the like may be used.

In order to stably float the magnet, FIG.
As shown in (2), unless the rotating shafts of the rotating bodies 1 and 2 are arranged in parallel with the axis of the magnetic pole of the magnet, the floating phenomenon of the magnet does not appear.

This is because the interaction between the rotating bodies 1 and 2 and the magnet 3 works so that the central axes of the magnetic poles are parallel to the rotating axes rotating the rotating bodies.

That is, the uniformity of the magnetic field diverging from both ends of the magnet 3 contributes to the stabilization of the floating phenomenon.

Next, a description will be given of a kind of linear motor car that utilizes the above-described magnet floating phenomenon.

FIG. 3 shows a schematic diagram. A magnet 110 (which corresponds to a linear motor car) is moved at a speed V in a direction shown in the drawing with respect to a guide plate 100 made of a conductor such as aluminum. As a result, the magnet 110 and the guide plate 1
00 and a relative movement occurs.

As already mentioned, the pole axis of the magnet 110 is parallel to the plane of the guide plate 100 and perpendicular to the direction of relative movement of the magnet and the conductor.

Once the speed V of the magnet exceeds the threshold value, the repulsive force due to the eddy current generated by the electromagnetic induction balances the gravity acting on the magnet, and the magnet 110 floats above the guide plate 100. The electromagnetic induction also creates a stabilizing force on both ends (poles) of the magnet 110 so that when the magnet 110 moves over the guide plate 100, the magnet 100 stably floats in a balanced state.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a conventional magnet floating.

FIG. 2 is a schematic view of the apparatus of the present invention (A) Front view (B) Side view (C) Top view

FIG. 3 is a schematic diagram of a linear motor car using the principle of the present invention.

[Description of sign]

FIG. 2 shows: 1, a conductor (rotating body) 2, a conductor (rotating body) 3, a magnet F1, a repulsive force F2 acting on the magnet 3 of the conductor 1, a repulsive force G acting on the magnet 3 of the conductor 2, and a magnet 3. Working gravity

FIG. 3 shows a guide plate (rail) 110, a magnet (linear motor car) V, and a speed of the magnet 110 with respect to the guide plate 100.

Claims (2)

[Claims] 1. An apparatus capable of floating a magnet in the air at room temperature without using repulsion of the magnet. 2. An apparatus for generating a repulsive force between a magnet and a conductor by using an eddy current generated in the conductor caused by a change in the magnet by relatively moving the magnet and the conductor.