JPH1016504A - Magnet wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supplement shortage of axle strength and to increase magnetic attraction force per volume of a permanent magnet by making polarities of magnetic poles of the permanent magnets arranged around the axle adjacent to each other with wheels between them homopolar and providing a cavity to restrain a magnetic flux contributing little to adsorbing force between the permanent magnet and the wheel. SOLUTION: Both end parts of an axle 13 in the axial direction are projected, and magnetic poles N, S of permanent magnets 12a, 12b are formed in parallel in the axial direction of the axle 13. Additionally, a magnet wheel 1 has structure that polarities of magnetic poles adjacent to each other with a wheel 11c between them are homopolar. An outside diameter part of the axle 13 and inside diameter parts of wheels 11a, 11b, 11c are arranged adhered to each other, but cavity parts 15a, 15b are provided between an outside diameter surface of the axle 13 and inside diameter surfaces of the permanent magnets 12a, 12b. Consequently, it comes to be possible to restrain magnetic fluxes f2a , f2b , contributing little to adsorbing force and to increase magnetic fluxes f1a , f1b contributing to improvement of the adsorbing force. It is possible to increase adsorbing force of the magnet wheel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a traveling body or a transporting apparatus which travels along a traveling path having magnetism, and is magnetically attracted to the traveling body or the transporting apparatus by rotating by suction. The present invention relates to a magnet wheel that moves an object.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. Hei 4-293688 discloses a magnetic attraction wheel in which a pair of wheels made of a magnetic material are connected by an axle, and at least a part of the axle is constituted by a permanent magnet (for example, a columnar magnet). It has been disclosed.

[0003]

FIG. 3 and FIG. 4 show a magnet wheel having the above-mentioned conventional structure. FIG. 3 is a front view thereof, and FIG. 4 is a sectional view taken along line BB of FIG. 3 and 4, the conventional magnet wheel 2 has axle portions 23a, 23a projecting in both directions.
The length in the axial direction is 10 mm. ) (A wheel 21 portion has an outer diameter of 40 mm).
X A thickness of 10 mm in the axial direction, for example, made of SS400. ) And a columnar permanent magnet 22 (for example, an outer diameter of 38 mm × a thickness of 5 m in the axial direction) between the wheels 21 and 21.
m Nd-Fe-B magnet. ) Is arranged. The permanent magnet 22 has magnetic poles N and S formed in the thickness direction. However, in FIG. 3 and FIG.
Is composed of a pair of axle portions 23a, 23a and the permanent magnet 22, so that the strength of the axle 23 is insufficient. This lack of strength is due to the fact that the axle 23 is divided into a pair of axle portions 23a and that it is difficult to connect the permanent magnet 22 and the axle portion 23a. further,
Among the magnetic fluxes emitted from the permanent magnets 22, the magnetic flux f ₁ on the attraction surface 100 side contributes to the improvement of the attraction force, but the magnetic flux f ₂ emitted from the central portion of the permanent magnet 22 contributes little to the improvement of the attraction force,
It has the problem that the magnetic flux f ₂ which is not utilized in the suction force of the magnetic flux generated in the permanent magnet 22 is present. Further, in the conventional magnet wheel, due to insufficient consideration of the form of the contact interface between the magnet wheel and the magnetic traveling path or the transferred object, the contact area between the magnet wheel and the magnetic traveling path or the transferred object (adsorption). Area) is difficult to be formed sufficiently. In this case, since a large amount of leakage magnetic flux is generated at the contact interface, there is a problem that the attraction force of the magnet wheel is reduced. The present invention provides a magnet wheel having a large magnetic attraction force per unit volume of a permanent magnet provided in view of the problems of insufficient axle strength, insufficient effective magnetic flux (f ₁ ), and leakage magnetic flux in the conventional magnet wheel. The task is to

[0004]

According to the present invention, in order to achieve the above-mentioned object, an axle, a permanent magnet and a wheel disposed around the axle are provided, and the magnetic poles adjacent to each other across the wheel have the same polarity. it is provided a gap for suppressing low the flux f ₂ contribution to the attractive force between the permanent magnet and the axle which has a structure is.

[0005] Next, according to the present invention, there is provided a magnet wheel provided on a truck traveling along a fixed magnetic traveling route, and applying a thrust to the truck by sucking and rotating on the traveling route, A plurality of wheels made of a ferromagnetic material are provided around the axle of the bogie, at least one permanent magnet is arranged between adjacent wheels, and the polarity of magnetic poles adjacent to each other across the wheels is the same. It is provided a gap for suppressing the contribution less the magnetic flux f ₂ to the adsorption force between the permanent magnet and the axle with some.

Next, according to the present invention, there is provided a magnet wheel provided on a fixed transfer device for sucking and transferring an object to be transferred having magnetism by rotating by suction in the transfer direction of the transfer device. A plurality of wheels formed around the axle of the bogie, at least one permanent magnet is disposed adjacently between adjacent wheels, and the polarities of magnetic poles adjacent to each other across the wheels are the same. It is provided a gap for suppressing the contribution less the magnetic flux f ₂ to the adsorption force between the permanent magnet and the axle. According to the present invention, by setting the polarity of the magnetic poles adjacent to each other across the wheel to be the same, and by providing a gap between the permanent magnet and the axle, the volume of the permanent magnet disposed on the magnet wheel is increased. It is possible to provide a magnet wheel having a large magnetic attraction force converted per hit.

In the present invention, the electrical resistivity at a temperature of 20 ° C. is 10 ⁻⁴ Ω · m or more at the interface between the wheel and the axle (for example, on the inner peripheral surface side of the wheel). It is preferable to provide an electric resistor. Due to the presence of the electric resistor, for example, a wheel portion made of a conductive metal ferromagnetic material is provided with a current collecting function, and a magnetic attraction force per volume of a permanent magnet disposed on the magnet wheel is improved. it can.
Examples of materials that can have an electrical resistivity of 10 ⁻⁴ Ω · m or more at a temperature of 20 ° C. include known synthetic resins such as Teflon, urethane, and nylon; and known ceramic materials such as oxides, nitrides, and carbides. Is mentioned.

Further, in the present invention, in order to increase the magnetic attraction force of the magnet wheel, the outer shape of the traveling path having magnetism or the wheel portion in contact with the transferred object is approximated to the outer shape of the running path or the transferred object. Is preferred. In particular, it is preferable that the outer contour of the wheel portion has a straight line and / or a curved line depending on the traveling path or the surface form of the transferred object.

In particular, if the convex curve of radius of curvature R ₁ of the outer form of the traveling path or the object to be conveyed having magnetism, the outer form of the wheel portion and the concave curve of the radius of curvature _{R y1, 10R 1> R y1} ≧
It is preferred that R ₁ be configured. Further, the outer shape of the magnetic traveling path or the transferred object is defined by the radius of curvature R
_{In the case where} the concave shape of No. ₂ and the outer shape of the wheel portion are convex curves with a radius of curvature R _y2 , it is preferable that the configuration is such that R ₂ ≧ R _y2 > 0.1R ₂ .

The shape of the permanent magnet is one or two selected from a ring shape, a fan shape, a trapezoidal shape, a rectangular shape, and a columnar shape (preferably, these shapes are plate-shaped). Shapes of more than one kind are practical. Further, the material of the permanent magnet is a rare-earth magnet (RCo ₅ system, R ₂ Co ₁₇ system, R-Fe-B system, Sm-Fe
-N or the like; where R is one or more of the rare earth elements including Y), ferrite magnets, alnico magnets, and other known permanent magnet materials such as one or more. .

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail with reference to the following examples. FIG. 1 is a front view showing an embodiment of the magnet wheel of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. 1 and 2, a non-magnetic axle 13 (this portion has an outer diameter of 10 mm and an axial length of 45 mm.
Made of 304. ) Are two ring-shaped permanent magnets 12a, 12
b (outer diameter 38mm x inner diameter 20mm x axial thickness 2.5m
m, for example, the permanent magnet 2 shown in FIGS.
Nd-Fe- manufactured by Hitachi Metals, Ltd.
B-30 anisotropic sintered magnet HS-30BV, etc. ) And three ferromagnetic wheels 11a, 11b, 11c sandwiching the permanent magnets 12a, 12b from both sides (11a, 11b have outer diameters of 40).
mm x inner diameter 10 mm x axial thickness 5 mm,
For example, SS400. 11c is outer diameter 40mm x inner diameter 1
It has a dimension of 0 mm x an axial thickness of 12 mm.
Made of S400. ) Is fixed to the shaft portion of the portion constituted by the above and the magnet wheel 1 of the present invention is constituted. Both ends of the axle 13 in the axial direction are protruded, and the magnetic poles N and S of the permanent magnets 12 a and 12 b are formed parallel to the axial direction of the axle 13. Further, the magnet wheel 1 has a structure in which the magnetic poles adjacent to each other across the wheel 11c have the same polarity. Outer diameter portion of axle 13 and wheels 11a, 11b, 11
c is disposed in close contact, but a gap 15 is provided between the outer diameter surface of the axle 13 and the inner diameter surfaces of the permanent magnets 12a and 12b.
a and 15b are provided. Void 15 instead of magnetic material
It is a feature of the present invention that a and 15b are provided and the magnetic poles adjacent to each other across the wheel 11c have the same polarity.
By providing the air gaps 15a and 15b instead of the magnetic material, it is possible to suppress the magnetic fluxes f _2a and f _2b that contribute little to the improvement of the attraction force and increase the magnetic fluxes f _1a and f _1b that contribute to the improvement of the attraction force. Becomes The gaps 15a and 15b have an outer diameter of 20 mm
An occupied space having an inner diameter of 10 mm and an axial thickness of 2.5 mm. As described above, in the magnet wheel 1, the magnetic flux f _2a ,
Since f _2b is suppressed by the gaps 15a and 15b, the magnetic wheel 1 out of the magnetic flux generated from the permanent magnets 12a and 12b
The effective magnetic fluxes f _1a and f _1b that contribute to the attraction force of the magnet wheel 1 increase, and the attraction force of the magnet wheel 1 can be increased. In addition, the axle 13 is an undivided integral body, and there is no problem in strength. The above-described magnet wheel 1 of the present invention is provided with an iron plate 100 which is a running path having magnetism.
(Having a size of 55 mm in length x 50 mm in width x 20 mm in thickness, for example, made of SS400).
When the magnetic attraction force between the iron plate 100 and the iron plate 100 was measured, the attraction force was 22.6 kgf, and the permanent magnets 12a, 12b
It was 5.5 kgf when converted into the magnetic attraction force per volume.

Next, the conventional magnet wheel 2 and the iron plate 1
When the magnetic attraction force between 00 and 00 was measured under the same conditions as for the magnet wheel 1, the attraction force was 27.2 kgf. When converted into the magnetic attraction force per volume of the permanent magnet 22, it is 4.8 kgf. Compared with the conventional magnet wheel 2, the magnet wheel 1 of the present invention achieves 15% improvement in the attractive force when compared with the magnetic attractive force per volume of the permanent magnets provided.

FIG. 5 is a plan view showing another example of the magnet wheel of the present invention, and FIG. 6 is a cross-sectional view taken along line CC of FIG. 5 and 6, the magnet wheel 3 has a permanent magnet 12a similar to the magnet wheel 1 around a ferromagnetic axle 33 (10 mm in outer diameter × 45 mm in axial length, made of, for example, SS400). 12b, three wheels 31a,
31b, 31c (31a, 31b have dimensions of outer diameter 40 mm × inner diameter 10 mm × axial thickness 5 mm, for example,
Made of SS400. 31c is outer diameter 40mm x inner diameter 10mm x
It has a dimension of an axial thickness of 12 mm, for example, SS400
Made. ) And wheels 31a, 31b, 31
electrical resistances 34a, 34b, 34c
(For example, urethane resin) is provided in a layered form, and the axle 33 is connected to the wheels 31a, 31b, 31c via the electric resistors 34a, 34b, 34c. Here, the electrical resistivity of the resistors 34a, 34b, 34c is 2 × 10 ¹¹ Ω · m at 20 ° C. In addition, between the axle 33 and the permanent magnets 12a and 12b, there are provided gaps 15a and 15b similar to those of the magnet wheel 1. Also, the permanent magnet 1
The magnetic poles N and S of 2a and 12b are formed parallel to the axial direction of the axle 33. Further, the magnet wheel 3 has a structure in which the magnetic poles adjacent to each other across the wheel 31c have the same polarity. The magnet wheel 3 was placed on the upper surface of the iron plate 100 under the same conditions as the magnet wheels 1 and 2, and the magnetic attraction force was measured.
It was 5.8 kgf in terms of magnetic attraction force per volume.

Next, one example of an application example of the magnet wheel 3 is shown in a front view of FIG. 7 and a side view of FIG. 7 and 8, a traveling vehicle 42 having a plurality of support wheels 44 is provided with a motor 45 and a deceleration along a traveling path 41 (for example, a hollow structure made of a steel material) fixed on the ground and having magnetism. The axle 33 of the magnet wheel 3 is rotationally driven by the machine 46,
The traveling vehicle 42 is configured to travel by a magnetic attraction force (magnetic friction force) acting between the traveling path 41 and the magnet wheel 3. In the present embodiment, the magnet wheel 3 is provided on the bogie 42 traveling along the traveling path 41 having a fixed magnetism, but the present invention is not limited to this.
The truck that travels along a traveling path having movable magnetism may be provided with the magnet wheel of the present invention.

Next, in the magnet wheel 1 shown in FIGS. 1 and 2, instead of using the ring-shaped permanent magnets 12a, four fan-shaped ferrite magnets 18a, 18b, and 18 are used.
An example in which the magnet wheel according to the present invention in which four fan-shaped ferrite magnets 19a, 19b, 19c, and 19d are arranged around the axle 13 in FIGS. 1 and 2 instead of using c and 18d and 12b. explain. As shown by the dotted line in FIG. 2, the fan-shaped magnet is a single ring-shaped magnet (for example, YBM-5BE manufactured by Hitachi Metals, Ltd., having an outer diameter of 38 mm, an inner diameter of 20 mm, and an axial thickness of 2.5 mm). The fan-shaped magnets are equally divided into four in the radial direction, and the four divided fan-shaped magnets are attached to each other to form a ring shape, and are arranged around the axle 13. Between the axle 13, there are gaps 15a, 15b as in the case of FIGS. Further, the magnetization direction (N pole, S pole) of each fan-shaped magnet is the thickness direction. The magnetic attraction force of this magnet wheel is 2.8kgf
And the attraction force per volume of the permanent magnet is 0.7 kgf
Met. The attraction force 0.7 obtained in this configuration
In this configuration, the value of kgf
It was confirmed that the attraction force per volume of the permanent magnet was improved by several% as compared with the case where no a and 15b were provided.

FIG. 9 is a front view showing another example of the magnet wheel of the present invention. FIG. 10 is a cross-sectional view taken along line DD of FIG. 9 and 10, the magnet wheel 4 of the present invention has a ferromagnetic axle 53 (external diameter 30 mm × axial length 180 mm, for example SS40).
0 made. ), Three wheels 51a, 51b, 51c (51a, 51b) sandwiching the following permanent magnets 52a, 52b.
Has an outer diameter of 184.9 to 196.0 mm x an inner diameter of 124 mm
× 12 mm in length in the axial direction, for example, made of SS400. 51c
Has an outer diameter of 180.0 to 182.7 mm and an inner diameter of 124 mm
× Axial length 24 mm, for example, made of SS400. ) Is provided, and the axle 53 is connected to the wheels 51a, 51b, 51c via electric resistors 54a, 54b, 54c (for example, made of urethane resin). Note that the electrical resistors 54a,
54b, 54c can be attached to the inner peripheral surface of the wheels 51a, 51b, 51c or the outer peripheral surface of the axle 53, for example. The volume resistivity of the resistors 54a, 51b, 51c is 2 × 10 ¹¹ Ω · m (20 ° C.). As shown in FIG. 10, the number of the permanent magnets 52a and 52b is 12
Four trapezoidal permanent magnets (for example, upper side 30.0mm, lower side 45.0
mm, height 28.0mm, thickness 4.0mm, Hitachi Metals Nd
-Fe-B anisotropic sintered magnet HS-37BH, etc. Axle 53
Circumference around (approx. Outside diameter 180mm, inside diameter 116mm)
And gaps 15a, 15b (outer diameter 116 mm × inner diameter 30 mm) between the axle 53 and the permanent magnets 52a, 52b.
X An occupied space with a thickness of 4 mm in the axial direction. ). Magnetization direction of permanent magnets 52a and 52b (N pole, S pole)
Is the thickness direction as shown. Further, the magnet wheel 4 has a structure in which the magnetic poles adjacent to each other across the wheel 51c have the same polarity. Wheels 51a, 51 of the magnet wheel 4
b, 51c is a ferromagnetic pipe (not shown) having an outer diameter of 101.6 mm, an inner diameter of 76 mm, an axial length of 600 mm, and an SS.
Made of 400. ), And the magnetic attraction force between the magnet wheel 4 and the iron pipe was measured. The radius of curvature R _y1 of the outer peripheral surfaces of the wheels 51a, 51b, 51c shown in FIG.
The radius of curvature of the steel pipe is approximately equal to the radius of curvature R ₁ = 50.8 mm.
_y1 = 53 mm. The measured attraction force was 280 kgf, and 2.78 kgf was obtained as the magnetic attraction force per volume of the permanent magnets 52a and 52b. This value of 2.78 kgf corresponds to the improvement of the magnetic attraction force per volume of the permanent magnet by several% as compared with the case where the gaps 15a and 15b are not provided in the configuration of FIG. Here, in the present invention, the outer shape of the magnetic traveling path or the transferred object is defined by a radius of curvature R
_When the convex shape of ₁ and the outer shape of the wheel portion are concave curves of a radius of curvature R _y1 , it is possible to configure so as to satisfy 10R ₁ > R _y1 ≧ R ₁ on a traveling road surface or a suction surface of a conveyed object. This is preferable for suppressing the leakage of magnetic flux and maintaining a large attraction force of the magnet wheel. Also, to maintain the outer form of the traveling path or the object to be conveyed having a magnetic concave curve of radius of curvature R _2, if the outer form of the wheel portion and the convex curve of radius of curvature R _y2, the suction force of the magnet wheel to a large Therefore, for the same reason as above, R ₂ ≧
It is preferable to configure so that R _y2 > 0.1R ₂ .

An example of an application of the magnet wheel 4 is shown in a front view of FIG. 11 and a side view of FIG. 11 and 12, the transfer device 6 fixed to the ground 60 includes a magnet wheel 4, an electric motor 62, and a power transmission belt 63. The transferred object 64 having magnetism (for example, a rod-shaped or pipe-shaped magnetic body) is generated by a magnetic attraction force (magnetic friction force) acting between the magnet wheel 4 rotated by the electric motor 62 and the transferred object 64. For example, when the magnet wheel 4 is rotated clockwise, the transported object 64 can be transported rightward. In the present embodiment, the transport device 6 is fixed on the ground, but the present invention is not limited to this. For example, the transport device 6 is placed on a moving body that moves in a predetermined area at a predetermined speed pattern.
Can of course be installed.

[0018]

According to the present invention, as a result of the following effects, the volume occupied by the permanent magnets arranged on the magnet wheels is small, and therefore, a magnet wheel having a large magnetic attraction force per volume of the permanent magnets can be manufactured. It is. (1) Since a gap is provided between the permanent magnets constituting the magnet wheel and the axle, generation of a magnetic flux which does not contribute to the attraction force is effectively suppressed by the gap. (2) Since the permanent magnets are arranged in the vicinity of the attracting surface side of the magnet wheels, the magnetic resistance between the magnet wheels and the magnetic traveling path or the object to be attracted is reduced, and the permanent magnets are arranged. A magnet wheel having a larger magnetic attraction force per volume can be provided, and the industrial value is extremely large. (3) The amount of magnetic flux leakage on the attraction surface is reduced by approximating the outer shape of the attracting surface of the magnet wheel in contact with the magnetically traveling path or the transferred object to the outer shape of the traveling path or the transferred object. Therefore, the magnetic attraction force can be further improved. In particular, the effect is remarkable in a magnet wheel used for a traveling path having a curved cross section or a transferred object.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a magnet wheel according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing a conventional magnet wheel.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a front view showing another example of the magnet wheel of the present invention.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a front view showing an example of application of the magnet wheel of the present invention.

FIG. 8 is a side view showing an example of application of the magnet wheel of the present invention.

FIG. 9 is a front view showing another example of the magnet wheel of the present invention.

FIG. 10 is a sectional view taken along line DD of FIG. 9;

FIG. 11 is a front view showing another application example of the magnet wheel of the present invention.

FIG. 12 is a side view showing another application example of the magnet wheel of the present invention.

[Explanation of symbols]

1,2,3,4 magnet wheel, 6 transfer device, 11a,
11b, 11c, 21, 31a, 31b, 31c, 51
a, 51b, 51c wheels, 12a, 12b, 22, 5
2a, 52b permanent magnets, 13, 23, 33, 53 axles, 15a, 15b air gaps, 41 running paths, 44 support wheels, 45 prime movers, 46 reducers, 62 motors,
63 belt, 64 transferred object, 100 iron plate

Continued on the front page (72) Inventor Ichizo Matsui 1-17-4 Sotokanda, Chiyoda-ku, Tokyo Magnet Transport System Development Co., Ltd.

Claims (6)

[Claims] 1. A wheel made of a permanent magnet and a magnetic material disposed around an axle and an axle, wherein a gap is provided between the permanent magnet and the axle, and a plurality of wheels are provided with permanent magnets magnetized in the axial direction of the axle. A magnetic wheel, wherein the magnetic poles adjacent to each other across the wheel have the same polarity. 2. A magnet wheel which is provided on a truck traveling along a fixed magnetic traveling route and applies thrust to the truck by suction-rotating on the traveling route, the magnet wheel being formed of a ferromagnetic material. A plurality of wheels are provided around the axle of the bogie, at least one permanent magnet is arranged adjacently between adjacent wheels, a gap is provided between the permanent magnets and the axle, and the wheels are further separated. A magnet wheel, wherein adjacent magnetic poles have the same polarity. 3. A magnet wheel, provided on a fixed transfer device, for sucking and transferring an object having magnetism by sucking and rotating in the transfer direction of the transfer device, wherein the plurality of magnet wheels are made of a ferromagnetic material. A plurality of wheels are provided around the axle of the bogie, at least one permanent magnet is arranged adjacently between adjacent wheels, a gap is provided between the permanent magnets and the axle, and magnetic poles adjacent to each other across the wheel A magnet wheel, wherein the magnet wheels have the same polarity. 4. An axle and wheels are connected via an electrical resistor having an electrical resistivity of 10 ⁻⁴ Ω · m or more at a temperature of 20 ° C. The described magnet wheel. 5. The magnet wheel according to claim 1, wherein the shape of the permanent magnet is any one of a ring shape, a fan shape, a trapezoid shape, a rectangular shape, and a column shape. 6. A sectional view including a center axis of an axle, wherein the outer shape of a wheel in contact with a traveling path having magnetic properties or a transferred object is a straight line and / or a curved line. The magnet wheel described in the above.