JPH07242169A - Magnetic belt - Google Patents

Abstract

PURPOSE:To provide a magnetic belt which is light in weight and is provided with sufficient attracting force by simplifying a shape of a yoke and increasing the proportion of the area of a magnet to the area of the yoke. CONSTITUTION:In a magnetic belt, a magnetic circuit consisting of a magnet 6, which is magnetized in the attracting direction F1 to a rail and in the vertical direction A, and yokes 7 arranged on both end faces of the magnets 6 is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet belt used in a magnet belt transportation system (BTM).

[0002]

2. Description of the Related Art Conventionally, a magnet belt transportation system (BTM) having a simple system configuration has been developed by applying magnets as a transportation system suitable for a place where transportation demand is relatively small. The BTM is designed to have power on the vehicle and drive the vehicle by utilizing the attraction force between the magnet and the iron piece (utilizing a large magnetic friction force generated when the magnet and the iron piece are attracted). The structure of a conventional magnetic circuit of a magnet belt is shown in FIG. A yoke 70 having a substantially U-shaped cross section is attached to a plurality of positions on the magnet belt.
A magnet 71 is fixed on the top of the. The magnet 71 is magnetized in a direction parallel to the attraction direction (F) with respect to the rail 2 fixed on the ground (the attraction direction (F) and the magnetization direction (G) in FIG. 15 are parallel). Then, the yoke 70 functions as a path for passing the magnetic flux generated by the magnet 71. Further, air or a non-magnetic material (for example, a filler such as epoxy resin) 74 occupies the periphery of the magnet 71.

[0003]

In the conventional magnetic circuit,
A magnet 71 magnetized in a direction parallel to the attraction direction (F) with respect to the rail is arranged. With such a magnetic pole arrangement, the magnetic flux is in the air or a non-magnetic substance (for example, a filler such as an epoxy resin or the like). ) There is a problem of passing through. The present inventor has already found that an appropriate gap is required between the magnet 71 and the yoke 70 to some extent in order to exert a sufficient attraction force as a magnet belt (Japanese Patent Application No. 6-
129764). Further, since the surface of the yoke 70 attracting the rail 2 is worn, the height of the yoke 70 (the length from the surface of the magnet 71 to the attracting surface) is required in consideration of the amount of wear of the yoke. Therefore, the space 74 occupied by air or a non-magnetic material (eg, epoxy resin) formed around the magnet can be reduced but cannot be eliminated. Also, in order to obtain a strong attracting force as a magnet belt, the width of the magnetic circuit itself that contacts the rail must be widened, so it is not possible to arrange the magnetic circuit on the magnet belt at a small pitch. It was difficult to downsize. Further, in the conventional magnetic circuit, the cross-sectional shape of the yoke 70 has to be U-shaped in order to form a path (magnetic path) through which the magnetic flux generated by the magnet passes. That is, the lower portion 70a and both end portions 70b of the yoke 70 were used as paths for passing magnetic flux. For this reason, the shape of the yoke is complicated, and the weight of the magnet belt is further increased accordingly.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art. The purpose of the present invention is to simplify the shape of the yoke and to make the magnetic flux in the air or non-existent when attracted to the rail. By forming a magnetic path without passing through a magnetic body and increasing the ratio of the area of the magnet to the area of the yoke, a magnet belt having a magnetic circuit that is lightweight and has a sufficient magnetic attraction force can be obtained. To provide. Further, another object of the present invention is to provide a magnet belt having a magnetic circuit capable of increasing the attraction force with a rail in a state where the mounting pitch is reduced.

[0005]

In order to achieve the above object, a magnet belt of the present invention is provided on a vehicle and is applied to a side surface of a rail fixed to the ground to rotate while attracting the rail to give a thrust to the vehicle. In the magnet belt, magnetic circuits having magnets magnetized in a direction perpendicular to the attraction direction with respect to the rail and yokes provided on both end surfaces of the magnet are arranged at a plurality of positions on the magnet belt. And Further, it is preferable that a gap is formed between the upper surface of the yoke and the upper surface of the magnet, and a nonmagnetic material is embedded in the gap. Further, it is preferable that a nonmagnetic cover is provided around the magnet and the yoke. Further, it is preferable that a plurality of the magnets are continuously arranged so that the same magnetic poles are adjacent to each other.

In another magnet belt of the present invention, the same magnetic poles are adjacent to each other in a magnet belt which is provided on a vehicle and which gives a thrust to the vehicle by rotating while attracting to the side surface of a rail fixed to the ground. The magnets are provided so as to match each other and are magnetized in the direction perpendicular to the attraction direction with respect to the rail, and the yokes provided on both end surfaces of the magnet, and the height of the magnet is h. When the width is w, the residual magnetic flux density of the magnet is Br, and the saturation magnetic flux density of the yoke is Bss, magnetic circuits satisfying the relationship of h / w ≧ Bss / Br are arranged at a plurality of positions on the magnet belt. Is characterized by. Further, a base member having a substantially convex cross section is provided at a plurality of positions on the magnet belt via a mounting member, the magnet is arranged on a protrusion of the base member, and the yoke is formed on the base. It is preferably arranged in the recess of the member. Further, it is preferable that an upper end portion of the yoke constitutes an engaging portion that engages with an upper end portion of the magnet, and an upper end surface of the yoke is attracted to a side surface of the rail.

[0007]

In the present invention, the magnet magnetized in the direction perpendicular to the attracting direction with respect to the rail is arranged on the magnet belt. With such a magnetic pole arrangement, even if the yoke is placed in close contact with both end surfaces of the magnet, a leakage magnetic flux is hardly generated. In the conventional magnetic pole arrangement, magnets magnetized in the direction parallel to the attraction direction with respect to the rail are arranged, so the magnetic flux must pass through the air or non-magnetic material, and the leakage magnetic flux cannot be ignored. It was On the other hand, if the magnetic poles are arranged as in the present invention, the magnetic gap between the yoke and the magnet becomes unnecessary, and the yoke can be arranged in close contact with both end surfaces of the magnet. As a result, the ratio of the area of the magnet to the area of the yoke can be increased, and the attraction force with the rail can be improved without mounting a large number of magnet units.

Further, with the magnetic pole arrangement according to the present invention,
Since the yokes can be arranged in close contact with both end surfaces of the magnet, a plurality of magnets can be arranged continuously while the mounting pitch of the magnets is reduced. Further, with the magnetic pole arrangement as in the present invention, the path for passing the magnetic flux generated by the magnet may be formed only at both ends of the magnet. In the conventional magnetic pole arrangement, a path for allowing the magnetic flux generated by the magnet to pass has been required at the bottom and both ends of the magnet. Therefore, the cross-sectional shape of the yoke had to be a relatively complicated U-shape. With the magnetic pole arrangement as in the present invention, it is possible to use a yoke having a simplified shape, which makes the magnet belt itself smaller,
Weight reduction is possible. Also, by embedding a non-magnetic material in the gap formed between the upper surface of the yoke and the upper surface of the magnet, it is possible to prevent short circuit of the magnetic flux and protect the magnet from the shock during adsorption (that is, Without this non-magnetic material, magnetic material such as iron powder or rust adheres to the gap to form a short-circuit magnetic path, which causes leakage magnetic flux). Further, if a non-magnetic cover is provided around the magnet and the yoke, it is possible to protect the magnet and the yoke (entire magnet unit) from a shock during adsorption.

Further, in the present invention, when the height of the magnet is h, the width of the yoke is w, the residual magnetic flux density of the magnet is Br, and the saturation magnetic flux density of the yoke is Bss, the relationship of h / w ≧ Bss / Br is satisfied. The magnetic circuit was configured so as to satisfy the above condition and placed on the magnet belt. The reason why the magnetic circuit is configured to satisfy such a relationship is to increase the attraction force with the rail in a state where the mounting pitch is narrowed (the reason will be described later). As a result, the size and weight of the magnet belt can be reduced. Therefore, even if the magnet belt is downsized, the attraction force can be maintained at the same level as that of the magnet belt using the conventional magnetic circuit.

A base member having a substantially convex cross section is provided at a plurality of positions on the magnet belt via mounting members, the magnets are arranged on the protrusions of the base member, and the yoke is It is arranged in each of the recessed portions of the base member. By thus disposing the yoke in the recess of the base member, it becomes possible to prevent the yoke from falling over. Further, by disposing the magnet on the protruding portion of the base member, the mounting member (rivet or the like) does not come into direct contact with the magnet. Therefore, when the mounting member is fixed (for example, when the rivet is caulked), the shock is applied to the magnet. It is possible to prevent damage to the magnet and the like. Further, since the upper end portion of the yoke constitutes an engaging portion that engages with the upper end portion of the magnet, it is possible to prevent the magnet from falling off during rotation of the magnet belt, for example. Further, since the upper end surface of the yoke is attracted to the side surface of the rail, the attracting surface with the rail is wider than that of the conventional magnetic circuit, and the wear of the yoke is reduced to prolong the life of the magnetic circuit (magnet belt). Can be achieved.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows the overall configuration of a vehicle to which the magnetic circuit of the present invention is applied.
4 (a) and 4 (b) show rail side surface traveling type and rail upper surface traveling type magnet belts as structural examples of the magnet belt of the present invention. The vehicle 1 travels along an iron rail 2 fixed to the ground. A magnet belt 3 is attached to the vehicle 1. Pulleys 4 are provided on both ends of the magnet belt 3, respectively. This pulley 4 is shown in FIG.
As shown in (b), it is driven by the motor 5 and the speed reducer 20 (for example, a bevel gear or the like). By driving the pulley 4 in this manner, the magnet belt 3 is rotated.

The magnet belt 3 is arranged on the side surface of the rail 2. At this time, the magnet belts 3 may be arranged on only one side of the rail 2 (adsorption on one side) or may be arranged on both sides (adsorption on both sides) as shown in FIG. Alternatively, it may be arranged only on the upper surface as shown in FIG. And the magnet belt 3
Is attracted to the rail 2 and the magnet belt 3 is rotated by driving the motor 5 and the speed reducer 20, a large magnetic frictional force is generated, and the vehicle 1 obtains thrust and travels along the rail 2.

Next, the structure of the magnetic circuit arranged on the magnet belt 3 will be described. A plurality of magnets are arranged on the magnet belt 3, one of which is shown in FIG.
Shown in. The magnet 6 is magnetized in a direction (A) perpendicular to the attraction direction (F1) with respect to the rail 2. A yoke (core) 7 is arranged on each end face of the magnet 6. The magnet 6 is a permanent magnet, for example, a rare earth magnet is preferable, and an R—Fe—B based permanent magnet (R: Nd,
One or more rare earth elements such as Pr) are particularly preferably used. In this example, a sintered magnet of Nd-Fe-B system (HS-37BH manufactured by Hitachi Metals, Ltd.) was used as the magnet 6. When an R-Fe-B based magnet is used as the magnet 6, an epoxy resin (N
1 or 2 of well-known plating such as i, Cu, Cr and Al
It may be one or more kinds), and the surface thereof is preferably coated in a single layer or multiple layers.

As described above, when the magnet 6 magnetized in the direction (A) perpendicular to the attraction direction (F1) with respect to the rail 2 is arranged on the magnet belt 3, the yoke 7 is closely attached to both end surfaces of the magnet 6. Even if they are arranged, almost no leakage magnetic flux is generated. Further, the magnetic path at the time of adsorption can be formed almost through the magnetic body. In the conventional magnetic pole arrangement (see FIG. 15), since the magnet 71 magnetized in the direction (G) parallel to the attraction direction (F) with respect to the rail 2 is arranged, the magnetic flux is generated in the air or the non-magnetic body. I had no choice but to pass. On the other hand, if the magnetic poles are arranged as shown in FIG. 1, it is not necessary to provide a magnetic gap between the magnet 6 and the yoke 7, and the yoke 7 can be closely arranged on both end surfaces of the magnet 6.

When the magnetic poles are arranged as shown in FIG. 1, the passage of the magnetic flux generated by the magnet 6 is as shown by the arrow B. The yoke 7 required to pass this magnetic flux is sufficient only at both ends of the magnet 6. On the other hand, in the conventional magnetic pole arrangement (see FIG. 15), the passage path of the magnetic flux generated by the magnet 71 is as shown by the arrow C. The yoke 70 necessary for passing the magnetic flux is necessary for the lower portion (70a) and both end portions (70b) of the magnet 71, and therefore, the yoke 70 is required.
Had to have a relatively complicated U-shaped cross section.

Next, FIG. 2 shows the structure of a magnetic circuit in the case where a plurality of magnets 6 are continuously arranged. FIG. 2 shows an example in which one magnet unit is composed of two magnets 6 and three yokes 7a and 7b. Here, the width (L) of the magnet unit is made equal to the width (L) of the yoke 70 of FIG. 15 for comparison with the conventional circuit configuration (see FIG. 15). The magnets 6 are arranged so that the same magnetic poles are adjacent to each other. Further, the width of the central yoke 7b (t
Although 2) is twice the width (t1) of the yokes 7a at both ends, the width of the yoke 7b may be at least the width of the yoke 7a. As described above, in the conventional magnetic circuit (see FIG. 15), the magnetic gap 74 is provided, and the lower portion (70a) and both ends (70b) of the magnet 71 in the yoke 70 are used as paths for passing magnetic flux. .

On the other hand, if the magnetic poles are arranged as shown in FIG. 2, it is not necessary to provide a magnetic gap between the magnet 7 and the yokes 7a and 7b, so that the same width (L) is provided.
The cross-sectional area of the magnet arranged with respect to the magnet unit can be increased. Further, since it is not necessary to dispose the yoke on the lower surface of the magnet 6, the weight of the yoke can be reduced. Therefore, if the magnetic pole arrangement shown in FIG. 2 is adopted,
Compared with the magnet volume kept constant, the weight is light and about 2
It is possible to configure a magnet unit having a double attraction force.

Here, a calculation example of the attraction force will be described with reference to FIG. FIG. 7A is a diagram showing a magnetic circuit of the present invention,
FIG. 7B is a diagram showing a conventional magnetic circuit. here,
The length is set to (l) in FIG. 7A and the length is set to (2l) in FIG. 7B in order to make the magnet volume the same by halving the length. As an example of calculating the attractive force, for example, a conventional magnetic circuit (see FIG.
According to (b)), the attraction force (F3) is 28.9 Kg, whereas according to the magnetic circuit of the present invention (FIG. 7A), the attraction force (F2) is 62.5 Kg. (F2 ≒ 2 ×
F3). However, the attraction force of these is Nd as a permanent magnet.
It is a calculation result when a —Fe—B based sintered magnet (HS37BH made by Hitachi Metals) is used, a yoke made of S45C is used, and l = 86 mm 2.

Further, as shown in FIG. 1, a gap 10 is formed between the upper surface of the yoke 7 and the upper surface of the magnet 6.
Then, it is necessary to embed a non-magnetic material 8 as shown in FIG. 5 in this gap 10 so that a magnetic material such as iron powder is not embedded and a short circuit of magnetic flux does not occur. The non-magnetic material 8 is formed of a general-purpose resin such as an epoxy resin or a polyamide resin, austenitic stainless steel, an aluminum alloy, engineering plastic, silicone, or the like. With this configuration, the magnet 6 can be protected from a shock during attraction, and even if the magnet belt of the present invention is used for a long period of time, a short circuit of magnetic flux does not occur, and the attraction force can be stably generated. The reliability of can be increased.

Further, instead of embedding the non-magnetic material 8 in the gap 10 between the magnet 6 and the yoke 7 as shown in FIG. 5, a non-magnetic material cover 9 is provided around the magnet 6 and the yoke 7 as shown in FIG.
May be provided. The cover 9 is made of epoxy resin, austenitic stainless steel, aluminum alloy, engineering plastic, fluorine resin such as tetrafluoroethylene, or the like. With this configuration, it is possible to protect the magnet 6 and the yoke 7 (entire magnet unit) from an impact at the time of attraction, and it is possible to obtain the same magnetic flux short-circuit prevention effect as when the non-magnetic body 8 is embedded. Although FIG. 1 shows a two-pole type magnetic circuit and FIG. 2 shows a three-pole type magnetic circuit, the present invention is not limited to this, and the number of magnetic poles depends on the mounting pitch of the magnet unit. Can also be arbitrarily increased or decreased.

Next, FIG. 8 shows the structure of a magnet belt in which another magnetic circuit of the present invention is arranged. Where (a)
Is a plan view, (b) is an A-A sectional view of (a), and (c) is a BB sectional view of (a). Belt 3 of magnet belt 3
The cross section of the back surface of 0 is formed in an uneven shape. Then, the concavo-convex portions 30a and 30b on the back surface of the belt 30 are attached to the pulley 4
It engages with the side surface (see FIG. 4) (formed in an uneven shape). When the pulley 4 is rotated in this state, the concave and convex portions 30a and 30b on the back surface of the belt 30 mesh with the side surfaces of the pulley 4, and the magnet belt 3 rotates in a fixed direction. The belt 30 is formed, for example, by filling the circumference of a steel cord, which is a reinforcing core wire, with chloroprene rubber. Further, the magnetic circuit 100 is arranged at a surface position of the belt 30 corresponding to the convex portion 30b on the back surface of the belt 30.

As described above, the magnetic circuit 100 is arranged at a plurality of positions on the surface of the magnet belt 3, one of which has a sectional structure shown in FIG. As in FIG. 1, the magnet 6 is magnetized in a direction perpendicular to the attraction direction (F) with respect to the rail 2. Then, the yokes 7 are arranged on both end surfaces of the magnet 6, respectively. As the magnet 6, one or more known permanent magnets such as ferrite, alnico and rare earth magnets can be used. Among them, rare earth magnets are preferable, and Nd-Fe-B based sintered magnets are particularly preferable. Then, in this example, a sintered magnet of Nd-Fe-B system (HS-37BH manufactured by Hitachi Metals, Ltd.) was used.

Here, when the height of the magnet 6 is h, the width of the yoke 7 is w, the residual magnetic flux density of the magnet 6 is Br, and the saturation magnetic flux density of the yoke 7 is Bss, the magnetic circuit has h / w ≥ The relationship of Bss / Br is satisfied. The magnetic circuit 100 is configured to satisfy such a relationship in order to increase the attraction force with the rail 2 with the mounting pitch of the magnets 6 being reduced.
The reason will be specifically described below. First, in order to obtain a strong attractive force, that is, in order to flow the magnetic flux most efficiently, when the amount of magnetic flux generated by the magnet 6 is Φm and the amount of magnetic flux flowing through the yoke 7 is Φy, the relationship of Φm ≧ Φy is satisfied. Need to meet. This means that Φy is used in a region where Φm does not magnetically saturate.

Here, the amount of magnetic flux generated by the magnet 6: Φm = Br × h (Br: residual magnetic flux density of the magnet 6, h: height of the magnet 6) The amount of magnetic flux flowing in the yoke 7: Φy = Bss × w ( Bss: saturation magnetic flux density of the yoke 7, w: width of the yoke 7). Therefore, in order to satisfy the above relational expression Φm ≧ Φy, the magnetic circuit 100 may be configured so as to satisfy the relationship of Br × h ≧ Bss × w, that is, h / w ≧ Bss / Br.

Since Br is the material property value of the magnet 6 and Bss is the material property value of the yoke 7, the magnet 6 is
By determining the materials (Br and Bss) used for the yoke 7 and the yoke 7, the ratio between the width (w) of the yoke 7 and the height (h) of the magnet 6 can be obtained. If the magnetic circuit 100 having the dimensions thus obtained is used, the magnetic belt 3 can be used in a state in which the mounting pitch of the magnetic circuit 100 is reduced (see FIG. 8B).
Since it can be arranged on the upper side, a strong attraction force can be obtained even with a small magnet belt 3.

Here, in the magnetic circuit 100 shown in FIG. 9, t (width of the magnet 6) = 1 mm, W (width of the yoke 7) =
The height (h) of the magnet 6 and the attractive force F (k
gf / mm) is shown in FIG. 10 (() in FIG. 10 represents the maximum magnetic flux density (T) on the surface of the yoke 7). The attraction force F means the attraction force applied to the pair of yokes per unit length. That is, for example, in FIG.
When the magnetic belt 3 is attracted to the rail in (a),
The attraction force is generated between any pair of yokes 7a and 7b and the rail. Then, the attraction force F can be measured as the attraction force per unit length applied to a pair of yokes 7a and 7b having a length L attracted to the rail. Therefore, the attraction force generated by one magnet unit including the magnet 6 and the pair of yokes 7a and 7b sandwiching the magnet 6 is F × L (kgf). Here, an Nd-Fe-B system permanent magnet (HS37BH manufactured by Hitachi Metals) is used as the magnet 6, and SS4 is used as the yoke 7.
A yoke made of 00 was used, and a rail made of SS400 was used as the rail 2. In this case, the yoke 7 (SS400)
Has a saturation magnetic flux density Bss of 1.8 (T: Tesla),
The residual magnetic flux density Br of the magnet 6 was 1.2 (T).

In this case, Bss / Br = 1.8 / 1.2 = 1.5. Therefore, in order to satisfy the relational expression of h / w ≧ Bss / Br, the relation of h ≧ 1.5w should be established. Therefore, w = 5m
When m, a strong adsorption force can be obtained by setting h to 7.5 mm or more. When h = 7.5 mm, the attraction force F is 0.52 (kgf / mm) (this value is, for example, in the magnetic circuit of FIG. Magnet 6 with 0.52 (kgf / mm)
Example of conventional value of adsorption force F when the volume is the same as 0.47 (k
larger than gf / mm)). Also, for example, h = 9 m
When m, h / w = 9/5 = 1.8, and since Bss / Br = 1.5 as described above, it can be seen that the relationship h / w ≧ Bss / Br holds. The suction force F when h = 9 mm is 0.7 (kgf / mm).

Further, the magnet 6 constituting the magnetic circuit 100.
As shown in FIG. 8B, the belt 3 of the magnet belt 3 is
The same magnetic poles are arranged at a plurality of positions above 0 so as to be adjacent to each other. In this case, as shown in FIG. 11, it is conceivable that a plurality of magnets 6 are arranged so that different magnetic poles are adjacent to each other. The force (f) is generated, and the attraction force (F) with the rail 2 becomes small, which is not preferable (particularly remarkable when the mounting pitch of the magnetic circuit 100 is small). Therefore, in the present invention, as shown in FIG. 8B, the same magnetic poles are adjacent to each other (the N and S poles are alternately reversed so that a large attracting force can be obtained even with a small mounting pitch. 2) The magnet 6 is arranged (however, when the number of teeth of the magnet belt 3 is an odd number, this magnetic pole arrangement is broken at only one place).

On the magnet belt 3, as shown in FIG. 12, a base member 12 having a substantially convex cross section (for example, SUS) is used.
304) is provided. The base member 12 is shown in FIG.
As shown in FIG. 3, the magnet belt 3 is fixed to the surface of the belt 30 by the rivets 13 at both ends of the belt 30. Through holes 11 (see FIG. 8) are formed at both ends of the belt 30.
(See (c)) is formed, the rivet 13 is inserted into the through hole 11 from the back surface of the belt 30, and
The base member 12 is firmly fixed to the surface of the belt 30 by penetrating through and caulking the end portion. Here, in the present embodiment, the rivet 12 was used as the mounting member, but the present invention is not limited to this, and other mounting members such as bolts, nuts and washers may be used.

As shown in FIG. 12, the magnet 6 is arranged on the protrusion 12a of the base member 12, and the yoke 7 is
It is arranged in each of the recessed portions 12b of the base member 12. In this way, by making the base member 12 into a stepped shape and disposing the yoke 7 in the recess 12b, the yoke 7 can be prevented from falling. Further, since the magnet 6 is arranged on the protrusion 12a of the base member 12, the head 13a of the rivet 13 does not directly contact the magnet 6 (a gap is formed). This prevents an impact when the rivet 13 is crimped from being transmitted to the magnet 6, and prevents damage to the magnet 6 when crimping.

Further, the upper end portion of the yoke 7 constitutes an engaging portion 70 (protruding portion) which engages with the upper end portion of the magnet 6.
Thereby, for example, it is possible to prevent the magnet 6 from falling off (the magnet 6 popping out) while the magnet belt 3 is rotating.
While the magnet belt 3 is rotating, the upper end surface 7a of the yoke 7 is attracted to the side surface of the rail 2. This engaging portion 70
By providing the above, the attraction surface to the rail 2 becomes wider, the wear of the yoke 7 is reduced, and the life of the magnetic circuit 100 can be extended.

An example of fixing the yoke 7 to the base member 12 shown in FIG. 12 is shown in FIGS. 14 (a) and 14 (b), respectively. As shown in FIG. 14A, first, four insertion pins 110 for inserting into the through hole 11 of the base member 12 are provided in the yoke 7, and the insertion pins 110 are inserted into the base member 1.
Insert into 2 through holes 11. After that, as shown in FIG. 14 (b), the yoke 7 can be fixed to the base member 12 by crushing the tip 110 a (dotted line shape) of the inserted pin 110 into a 110 b shape (so-called caulking). Further, the magnet 6 may be fixed to the yoke 7 by magnetic attraction only after applying an adhesive or by magnetic attraction. Further, in the present embodiment, an example in which the pair of yokes 7 is caulked and fixed to the base member 12 is shown, but instead of caulking, they may be fixed by welding or an adhesive.

The magnet belt of the present invention is, for example, a wheelchair with a magnet belt, a small in-plant carrier vehicle with a magnet belt,
It can be widely used for applications using magnetic attraction such as small vehicles.

[0034]

According to the present invention, the shape of the yoke can be simplified and the ratio of the area of the magnet to the area of the yoke can be increased when manufacturing the magnetic circuit for the magnet belt of a certain size. . As a result, it is possible to provide a magnet belt that is lightweight and has a sufficient attractive force. Further, the magnet and the yoke (entire magnet unit) can be protected from the impact at the time of attraction. Further, even if the magnet belt of the present invention is used for a long period of time, it is possible to prevent short circuit of magnetic flux, stably generate an attractive force, and provide a highly reliable magnet belt. Further, according to the present invention, the attraction force with the rail can be made strong in a state in which the mounting pitch of the magnetic circuit is reduced, so that the size and weight of the magnet belt can be reduced. As described above, by adopting the magnetic circuit of the present invention, it is possible to achieve the size reduction, weight reduction, high performance, and cost reduction of the BTM driving vehicle.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a magnetic circuit of a magnet belt of the present invention.

FIG. 2 is a diagram showing another configuration of the magnetic circuit of the magnet belt of the present invention.

FIG. 3 is a diagram showing an overall configuration of a vehicle to which the present invention is applied.

FIG. 4 is a diagram showing a method of driving a magnet belt, (a)
FIG. 4B is a diagram showing a rail side surface traveling type, and FIG.

FIG. 5 is a diagram showing an improved example of the magnetic circuit of the magnet belt of the present invention.

FIG. 6 is a diagram showing another modified example of the magnetic circuit of the magnet belt of the present invention.

FIG. 7 is a diagram for explaining an example of calculation of adsorption force,
(A) is a figure which shows the magnetic circuit of the magnet belt of this invention, (b) is a figure which shows the conventional magnetic circuit.

8A and 8B are diagrams showing a configuration of a magnet belt in which another magnetic circuit of the present invention is arranged, wherein FIG. 8A is a plan view, FIG. 8B is a sectional view taken along line AA of FIG. 8A, and FIG. It is a BB sectional view of (a).

FIG. 9 is a diagram showing a cross-sectional structure of another magnetic circuit of the magnet belt of the present invention.

FIG. 10 shows the height h of the magnet in the magnetic circuit shown in FIG.
It is a figure which shows the relationship between the adsorption force F and.

FIG. 11 is a comparative example of a magnet belt.

FIG. 12 is a view showing a cross-sectional structure of another magnetic circuit of the magnet belt of the present invention.

FIG. 13 is a view showing a mounting structure of a magnetic circuit to a magnet belt.

FIG. 14 is a diagram showing a method of fixing the yoke.

FIG. 15 is a diagram showing a configuration of a conventional magnetic circuit.

[Explanation of symbols]

 1 vehicle 2 rail 3 magnet belt 6 magnet 7 yoke 8 non-magnetic material 9 cover 10 gap 12 base member 13 rivet

Claims (7)

[Claims] 1. A magnet belt, which is provided on a vehicle and applies a thrust force to the vehicle by rotating while attracting to a side surface of a rail fixed to the ground, magnets magnetized in a direction perpendicular to the attraction direction with respect to the rail. And a magnetic circuit having yokes provided on both end surfaces of the magnet, the magnetic circuits being arranged at a plurality of positions on the magnet belt. 2. The magnet belt according to claim 1, wherein a gap is formed between the upper surface of the yoke and the upper surface of the magnet, and a non-magnetic material is embedded in the gap. 3. The magnet belt according to claim 1, wherein a cover made of a non-magnetic material is provided around the magnet and the yoke. 4. The magnet belt according to claim 1, wherein a plurality of the magnets are continuously arranged so that the same magnetic poles are adjacent to each other. 5. A magnet belt, which is provided on a vehicle and applies thrust to the vehicle by being attracted to the side surface of a rail fixed to the ground, is provided with the same magnetic poles adjacent to each other, and the rail is provided. The magnet has a magnet magnetized in a direction perpendicular to the attracting direction, and yokes provided on both end surfaces of the magnet. The height of the magnet is h, the width of the yoke is w, and the residual magnetic flux of the magnet is The density is Br and the saturation magnetic flux density of the yoke is Bs.
A magnetic belt, wherein magnetic circuits satisfying a relationship of h / w ≧ Bss / Br when s is set at a plurality of positions on the magnet belt. 6. A base member having a substantially convex cross section is provided at a plurality of positions on the magnet belt via mounting members, and the magnet is arranged on a protrusion of the base member.
The magnet belt according to claim 5, wherein the yoke is arranged in a recess of the base member. 7. The upper end portion of the yoke constitutes an engaging portion that engages with the upper end portion of the magnet, and the upper end surface of the yoke is attracted to the side surface of the rail. The described magnet belt.