JPH0667051B2 - Magnetic levitation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic levitation device that cooperates with a linear motor to move a moving body in a levitation state.

(Prior Art) Conventionally, when a magnetic levitation device is formed in which a magnetic path is formed between a guide rail and a moving body, and the absorbing force generated between them is used to maintain a predetermined separation state, the moving body absorbs the absorbing force. It was configured to be suspended from the guide rail by. Further, in order to maintain this predetermined separation state, the magnetic flux formed by the electromagnet is increased or decreased among the magnetic flux passing through the magnetic path formed by the permanent magnet and the electromagnet. The magnet itself was included.

(Problems to be Solved by the Invention) In the magnetic levitation device described above, the moving body can be kept in the separated state in the gravity direction, but movement in the direction orthogonal to the gravity direction and the guide rail direction is restricted. However, the arrangement of the magnetic levitation device itself in the direction of gravity was limited.

Further, since the permanent magnet itself having a low magnetic permeability constitutes the magnetic path of the electromagnet, there is a drawback that the electromagnetic conversion efficiency becomes low.

(Means for Solving Problems) A permanent magnet and a pair of projecting poles each having a predetermined interval at each end in one direction are formed, and N and S are arranged so as to sandwich the permanent magnet substantially symmetrically. A pair of substantially pole-shaped magnetic pole members made of magnetic members fixedly arranged on the respective magnetic pole surfaces,
A levitation body having at least one magnetic pole portion composed of a coil wound around each of the projecting poles, and a predetermined distance from each of the projecting poles along the direction connecting the magnetic pole surfaces of N and S. And a pair of guide rails made of magnetic members that are arranged in parallel to each other so as to sandwich the levitation body through the gap between the pair of guide rails and the pair of projecting poles facing each other. The suction forces to be formed are configured so as to have opposite component forces.

(Operation) By applying an appropriate current to the coils wound around the respective projecting poles, the moving force of the floating body can be obtained in a direction other than the direction parallel to the pair of guide rails, and this position movement regulation can be performed.

In this case, the permanent magnet itself is not included in the magnetic path of the magnetic flux formed by passing a current through each coil.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the device of the present invention.
FIG. 1A is a front view thereof, FIG. 1B is a top view thereof, and FIG. 1C is a left side view thereof.

In the figure, 1 and 2 are a pair of guide rails made of magnetic members and arranged in parallel with each other with a predetermined distance maintained. The levitation body 3, which is located between the pair of guide rails and is controlled to maintain a predetermined levitation state, is composed of magnetic pole portions 5 and 6 and a non-magnetic connecting member 4.

In the magnetic pole portion 5, magnetic pole members 7 and 8 made of a magnetic member made of a magnetic member and fixed to the N and S magnetic pole surfaces of the permanent magnet 9 are fixed, respectively. Further, these projecting poles 7 ₁ , 7 ₂ , 8 ₁ and 8 ₂ of the magnetic pole members 7 and 8 facing the guide rail 1 have coils T 7 ₁ , T 7 ₂ , T 8 ₁ and T ₂ , respectively.
8 ₁ is also each of the projecting poles 7 ₃ , 7 ₄ facing the guide rail 2,
The coils T7 ₃ , T7 ₄ , T8 ₃ , and T8 ₄ are wound around 8 ₃ and 8 _{4 the} same number of times.

On the other hand, the magnetic pole portion 6 is also configured in the same manner, and magnetic pole members 10 and 11 made of a magnetic member and formed in a substantially letter-like shape are formed on the magnetic pole surfaces of N and S of the permanent magnet 12 having the same strength as the permanent magnet 9. Each is fixed. Furthermore, these projecting poles 10 ₁ , 10 ₂ , 11 ₁ , 11 ₂ facing the guide rail 1 of these magnetic pole members 10, 11 are arranged.
Have coils T10 ₁ , T10 ₂ , T11 ₁ , T11 ₂ respectively, and projecting poles 10 ₃ , 10 ₄ , 11 ₃ , 11 ₄ facing the guide rail 2 have coils T10 ₃ , T10 ₄ , T11 respectively. _3, T11 ₄ is wound by the same number of times. These magnetic pole parts 5 and 6 are connected to each other by the connecting member 4.
The floating body 3 is formed by being fixedly arranged at both ends of the floating body 3.

Further, the same set each pair of protrusions machining gap was of the pole members 7,8,10,11, for example projection electrode 7 ₁ and 7 ₂ of the inter-electrode distance w ₂ and the width w of the guide rails 1, 2 _The distance w ₄ between the guide rails and the width w _{3 of the} magnetic pole member are set to be substantially equal to ₁ , and gaps g ₁ and g ₂ are formed between them.

The operation of the embodiment apparatus configured as described above will be described with reference to FIGS. 1 to 3.

In FIG. 1, assuming that the levitation body 3 is located at the center between the guide rails and no current flows through the coil wound around the protruding pole of each magnetic pole portion, for example, Each of the projecting poles 7 ₁ of the magnetic pole member 7 which has become the N pole by the permanent magnet 9
7 ₄ and between the guide rails 1, 2, and since the between the projections electrode 8 _{1-8 2} and the guide rails 1, 2 of the magnetic pole member 8 becomes the S pole magnetic flux a same level are formed, the The suction force between them is also the same. Similarly, the same amount of magnetic flux a is formed between the respective projecting poles of the magnetic pole members 10 and 11 of the magnetic pole portion 6 and the guide rails.

In the magnetic pole member 7 of the magnetic pole portion 5 which has become the N pole in this state,
Each coil to form the magnetic flux b in the direction shown in FIG.
When a current is applied to T7 _{1 to} T7 ₄ , the magnetic flux formed between the projecting poles 7 ₁ and 7 ₃ and each guide rail decreases, and it is formed between the projecting poles 7 ₂ and 7 ₄ and each guide rail. The magnetic flux increases. Therefore, the attractive force between the projecting poles 7 ₁ and 7 ₃ and each guide rail becomes weak, and conversely, the attractive force between the projecting poles 7 ₂ and 7 ₄ and each guide rail becomes strong.
Further, also in the magnetic pole member 8 of the magnetic pole portion 5 that has become the S pole, the magnetic flux formed between the projecting poles 8 ₁ and 8 ₃ and each guide rail is reduced, and the projecting poles 8 ₂ and 8 ₄ and each by supplying a current to each coil T8 ₁ t8 ₄ as magnetic flux formed between the guide rail is increased, the attraction force between the projections electrode 8 _{1-8 4} and each of the guide rails changes as well.

As described above, the levitation body 3
Obtains a moving force in the direction of arrow A with respect to each guide rail 1, 2.

In this case, in order that the moving force of the levitation body 3 in the direction of the arrow A maintains a desired balance, an appropriate current is applied to each coil in the magnetic pole portion 6 as well, so that each protruding pole and the guide rail are separated from each other. Although each attraction force is changed in the same manner, the principle of changing each attraction force is the same as the principle of the magnetic pole portion 5 described above, and the description thereof will be omitted.

Further, as shown in FIG. 2 (b), the levitation body 3 is set by setting the current flowing in each coil so that the direction of the magnetic flux b formed is opposite to that in the case of FIG. 2 (a). It is obvious that a moving force in the direction of arrow B is obtained for each of the guide rails 1 and 2.

FIG. 3 shows a state of the magnetic flux c formed in the magnetic pole portion 5 when the levitation body 3 is changed in the directions of arrows C and D with respect to each guide rail.

That is, in order to form the magnetic flux c in the direction shown in FIG.
Each projection electrode ₇₁ of the pole member 7,8, 7 _3, 8 _1, 8 ₃ wound coils T7 ₁ which is wound, T7 _3, T8 _1, when an electric current is applied to the T8 _3, salient poles
The magnetic flux formed between 7 ₃ and 8 ₃ and the guide rail 2 increases to increase the attractive force, and conversely, the protruding poles 7 ₁ and 8 ₁ and the guide rail 1
The magnetic flux formed between them decreases and the attractive force becomes weak.

In addition, the protruding poles 7 and 8 of the magnetic pole members 7 and 8 are similarly supplied with current through the coils T7 ₂ , T7 ₄ , T8 ₂ and T8 ₄ wound around the protruding poles 7 ₂ , 7 ₄ , 8 ₂ and 8 ₄ , respectively. Increase the suction force between ₄ , 8 ₄ and the guide rail 2,
On the contrary, by weakening the attraction between the projecting poles 7 ₂ and 8 ₂ and the guide rail 1, the levitation body 3 obtains a moving force in the arrow C direction with respect to each of the guide rails 1 and 2.

In this case, an appropriate electric current is applied to each coil in the magnetic pole member 6 so that the moving force of the floating body 3 in the direction of arrow C maintains a desired balance, and the gap between each projecting pole and the guide rail is increased. Although each attraction force is changed in the same manner, the principle of changing each attraction force is the same as the principle of the magnetic pole portion 5 described above, and the description thereof will be omitted.

Further, as shown in FIG. 3 (b), the levitation body 3 is set by setting the current flowing through each coil so that the direction of the magnetic flux c formed is opposite to that in the case of FIG. 3 (a). It is obvious that a moving force in the direction of arrow D is obtained for each of the guide rails 1 and 2.

Although the current control method for supplying a current to each coil is not disclosed in detail, for example, when controlling the floating state of the floating body 3 in the directions of arrows C and D, a cap sensor that detects the gaps g ₁ and g ₂ is used. A negative feedback control method may be considered in which the current is supplied to each coil so that each gap becomes equal based on the detection signals. Also, arrows A and B
Even in the direction, for example, the gap shown in FIG. 1 (c)
A negative feedback control method is conceivable in which a gap sensor for detecting g ₃ and g ₄ is provided and a current is supplied to each coil so that each gap becomes equal based on the detection signals of these. Such a current control method for controlling the floating state of the levitation body 3 can be sufficiently dealt with by a known technique.

FIG. 4 shows another embodiment of the device of the present invention.

In the figure, the structure of the floating body 3 is the same as that of the above-mentioned embodiment, but the guide rails 1 ', 2'are substantially U-shaped. According to this configuration, when a current flows to each coil T7 ₁ ~T7 ₄ to form a magnetic flux b in the direction shown in the figure,
The magnetic flux formed between the salient poles 7 ₁ and 7 ₃ and each guide rail decreases and the attractive force between them decreases, and the magnetic flux formed between the salient poles 7 ₂ and 7 ₄ and each guide rail increases. As a result, the attraction force becomes strong during this period, so that the floating body 3 obtains a moving force in the arrow B direction with respect to each guide rail. Similarly, in order to obtain the moving force in the direction of arrow A, it is clear that the directions in which the respective currents flow may be reversed.

Although the levitation body 3 of the above embodiment has two magnetic pole portions, the present invention is not limited to this, and may have one magnetic pole portion or three or more magnetic pole portions.

As described above, the present invention is not limited to the above-mentioned embodiments, and various aspects are obtained.

(Effect of the Invention) According to the device of the present invention, the position movement of the floating body can be restricted in a direction other than the predetermined direction parallel to the pair of guide rails, and the arrangement of the device itself in the direction of gravity can be freely set.

Furthermore, since the permanent magnet is not included in the magnetic path of the electromagnet, the electromagnetic conversion efficiency can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention, FIG. 4 is a block diagram showing another embodiment, and FIGS. 2 and 3 are diagrams for explaining the operation of the present invention. 1, 1 ', 2, 2' ... Guide rail, 3 ... Levitator, 4 ...
Connection members, 5, 6 ... Magnetic pole parts, 7, 8, 10, 11 ... Magnetic pole members, 9, 12 ... Permanent magnets, 7 _{1 to} 7 ₄ , 8 ₁ to 8 ₄ , 10 ₁ to 1
0 _4, 11 ₁ to 11 ₄ ... projection _{electrode, T7 1 ~T7 4, T8 1} ~T8 4, T10 1 ~T1
0 ₄ , T11 _{1 to} T11 ₄ ... Coil.

Claims (1)

[Claims] 1. A permanent magnet and a pair of projecting poles each having a predetermined interval at each end in one direction are formed, and each magnetic pole surface of N and S is sandwiched so as to sandwich the permanent magnet substantially symmetrically. A levitation body having at least one magnetic pole portion composed of a pair of substantially pole-shaped magnetic pole members which are fixedly arranged and made of magnetic members, and coils which are respectively wound around the respective projecting poles; A pair of guide rails made of magnetic members arranged parallel to each other so as to sandwich the levitation body with a predetermined gap from each of the projecting poles. 2. The magnetic levitation device according to claim 1, wherein the attraction forces formed between the guide rails and the pair of projecting poles facing each other have mutually opposite component forces.