JP2002175913A - Magnetically attracting member and magnetic attracting device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetically attracting member, that can improve energy efficiency of various kinds of magnetic attracting devices, when the member is used in the device, and to provide a magnetically attracting device using the member. SOLUTION: The magnetically attracting member 5 is constituted, in such a way that a magnetic circuit is formed by respectively connecting both ends of a yoke 1 made of a soft magnetic material to both pole ends of a permanent magnet 3, and at the same time, a winding section 4 is provided in the yoke 1. Consequently, the member 5 attracts a magnetic material by discharging magnetic fluxes from the magnetism radiating surface of the yoke 1 adjoining to the permanent magnet 3, when an electric current is made to flow to the winding section 4 so as to impress a magnetic field upon the yoke 1 in the canceling direction of a magnetic path formed in the yoke 1. On the magnetism radiating surface of the yoke 1, projections 6 and 6 are provided, so that the sections 6 are protruded further outward than the magnet 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic attraction member used for an electrically driven rotary, linear or step motor using a hybrid type magnet called a basic factor and a magnetic attraction device using the same.

[0002]

2. Description of the Related Art Conventionally, a hybrid magnet shown in FIG. 28 has been proposed (see Japanese Patent Application No. 10-27884).

As shown in FIG. 28, a hybrid type magnet 150 is called a basic
1 and an engaging member 152 closely attached to both ends thereof. The electromagnet 151 includes a yoke 155 made of a U-shaped magnetic material having a base 153, legs 154 protruding in the same direction from both ends of the base 153, and a base 15 of the yoke 155.
And an excitation coil 156 wound around the coil 3. On the other hand, the engaging member 152 includes a permanent magnet 157 and a pair of magnetic members 158 sandwiching both sides thereof.

Here, in the state of FIG. 28, the outer surface of the engaging member 152 of the hybrid magnet is defined as the working surface X, and when the joining surfaces P and Q do not attract or repel, the soft magnetic material is close to the working surface X. A movable member 160 made of a material is assumed. When a current is applied to the exciting coil 156, the magnetic flux of the permanent magnet 157 passes through the air gap between the movable members beyond the joining surfaces P and Q without forming the closed magnetic path S1 in the hybrid magnet 150 without forming the closed magnetic path S1. S2 is configured to generate a suction force on the operation surface X.

FIG. 29 is a diagram showing an example of an electric motor using the hybrid magnet shown in FIG. 27 (Japanese Patent Application No. 10-32).
No. 1044). Referring to FIG. 29, the electric motor 17
In No. 0, two hybrid magnets 150 and 157 are disposed so as to face left and right, and a sliding member 161 that slides perpendicularly to the paper surface is disposed therebetween. The sliding member 161 has a square pillar-shaped base 162 made of a non-magnetic material at the center, and holes 163 are provided at two positions above and below the base 162, and rails (not shown) are provided in the holes 163. Passing through. A mounting plate 164 also made of a non-magnetic material is provided on both left and right sides of the base 162, and a movable member 165 made of a magnetic material is provided on both ends of the mounting plate 164.
Is attached. A gap G is formed between the movable member 165 and the engaging member 152 of the hybrid magnet 150.

In the electric motor 170 having such a configuration,
The attraction force exerted by the hybrid magnet 150 on the magnetic bodies passing each other is larger than that of the electromagnet alone at the same current value, and the energy exerted on the sliding member is larger.

[0007]

However, the hybrid magnet 150 of the electric motor 170 has room for improvement in practicality from the viewpoint of energy efficiency.

The improved hybrid magnet 1
If 50 is used, energy efficiency can be further improved in various magnetic attraction devices, for example, bearings, electromagnetic clutches, electromagnetic brakes, linear actuators, rotary actuators, motors, solenoids, and the like.

Therefore, one technical object of the present invention is to provide a magnetic attraction member capable of improving energy efficiency even in various magnetic attraction devices.

Another technical problem of the present invention is that
An object of the present invention is to provide a magnetic attraction device using the above-described magnetic attraction member.

[0011]

According to the present invention, a magnetic circuit is formed by connecting both ends of a yoke made of a soft magnetic material at both extremes of a permanent magnet, and a winding portion is provided on the yoke. By applying a current to the winding portion so as to apply a magnetic field in a direction to cancel a magnetic path formed in the yoke by the permanent magnet, from a magnetic emission surface of the yoke adjacent to the permanent magnet, A magnetic attraction member is provided, wherein the magnetic attraction member for attracting the magnetic material by emitting the magnetic flux has a protrusion on the magnetic emission surface so as to protrude outside the permanent magnet.

According to the present invention, in the magnetic attraction member, the yoke includes a ring-shaped hollow portion and at least one ring-shaped groove reaching the hollow portion and having a width smaller than that of the ring-shaped middle portion. A magnetic attraction member characterized by having a cylindrical shape is obtained.

According to the present invention, in the magnetic attraction member, the at least one groove is provided on at least one of an end surface of a cylindrical surface of the yoke and an outer peripheral surface thereof. A characteristic magnetic attraction member is obtained.

According to the present invention, there is provided a magnetic attraction member according to the magnetic attraction member, wherein the yoke further has a ring-shaped cross section having a hole at a central portion.

According to the present invention, in the magnetic attraction member, the at least one groove is provided on at least one of an end surface, an outer peripheral surface, and an inner peripheral surface of a cylindrical surface of the yoke. The magnetic attraction member characterized in that:

According to the present invention, there is provided a magnetic attraction member characterized in that in any one of the magnetic attraction members, the groove is provided with a ring-shaped permanent magnet.

Further, according to the present invention, in the magnetic attraction member, the yoke has a prismatic shape, and has at least one of a hollow portion formed in a central axis direction of the prism and the hollow portion. A magnetic attraction member characterized by having at least one groove extending in a direction along the central axis leading to.

Further, according to the present invention, in the magnetic attraction member, at least two rows of the hollow portions are arranged in a width direction or a thickness direction of the prism. .

According to the invention, in the magnetic attraction member, the yoke has a rectangular plate shape, and has at least one through hole and a groove extending from a side surface of the square surface to the through hole. A permanent magnet is mounted, and the plurality of yokes are arranged so that the permanent magnet is directed toward the central axis.
A magnetic attraction member characterized by being arranged around a shaft is obtained.

Further, according to the present invention, in the magnetic attraction member, the yoke is a disk or a ring, and has a plurality of grooves on an outer peripheral surface or an inner peripheral surface. can get.

According to the invention, the magnetic attraction member and the attraction member made of a magnetic material are provided, and the attraction member is provided with a projection on a surface facing the projection. A magnetic attraction device is obtained.

According to the present invention, in the magnetic attraction device, the yoke has a cylindrical shape, and the cylinder has a ring-shaped hollow portion and at least one ring-shaped groove reaching the hollow portion. A magnetic attraction device characterized by comprising:

According to the invention, in the magnetic attraction device, the at least one groove is provided on at least one of an end surface, an outer peripheral surface, and an inner peripheral surface of a cylindrical surface of the yoke. Thus, a magnetic attraction device is obtained.

According to the present invention, in the magnetic attraction device, a groove is provided in a circumferential direction of an outer peripheral surface of the cylindrical surface, a permanent magnet is mounted in the groove, and the attracting member is A magnetic attraction device is provided, which extends in the axial direction outside the outer peripheral surface and is arranged at a plurality of equal angular intervals in the circumferential direction.

According to the present invention, in the magnetic attraction device, a plurality of pairs of protrusions are provided on both sides in a circumferential direction of the permanent magnet, and the plurality of pairs of protrusions are equiangularly spaced on the circumference. The magnetic attraction device is characterized in that the magnetic attraction device is provided so that

According to the present invention, in the magnetic attraction device, the plurality of pairs of protrusions corresponding to the respective permanent magnets are slightly shifted in the circumferential direction as they move in the axial direction. A characteristic magnetic attraction device is obtained.

According to the present invention, in the magnetic attraction device, a groove is provided in a circumferential direction of an inner peripheral surface of the cylindrical surface, a permanent magnet is mounted in the groove, and the attracting member comprises: A magnetic attraction device is obtained, wherein the magnetic attraction device extends in the axial direction inside the inner peripheral surface, and is arranged at a plurality of equal angular intervals in the circumferential direction.

According to the invention, in the magnetic attraction device, a plurality of pairs of protrusions are provided on both sides in a circumferential direction of the permanent magnet, and the plurality of pairs of protrusions are equiangularly spaced on the circumference. The magnetic attraction device is characterized in that the magnetic attraction device is provided so that

According to the present invention, in the magnetic attraction device, the plurality of pairs of protrusions corresponding to the respective permanent magnets are slightly shifted in the circumferential direction as they move in the axial direction. A characteristic magnetic attraction device is obtained.

According to the present invention, there is provided the magnetic attraction device according to the magnetic attraction device, wherein the yoke has a ring-shaped cross section further provided with a hole at the center.

Further, according to the present invention, in any one of the magnetic attraction devices, the yoke or the attraction member is formed so as to be rotatable about a central axis, and is rotated about one of the central axes. As a result, a magnetic attraction device characterized by being biased is obtained.

According to the present invention, in the magnetic attraction device, a groove is provided at one end of the cylinder concentrically with the outer peripheral surface of the cylinder, and a permanent magnet is mounted in the groove, So as to sandwich the magnet in the radial direction,
Equipped with protrusions arranged at equal angular intervals, the suction member has a disk shape having one end so as to face the one end, and the protrusion is provided on one end surface of the disk. A magnetic attraction device characterized in that the protrusions are provided so as to face each other.

According to the present invention, in the magnetic attraction device, the outer peripheral surface side and the central shaft side of the cylinder protrude in the axial direction to form a ring-shaped concave portion,
The magnetic attraction device is characterized in that the protrusion is formed at each of the protruding ends, and a ring-shaped protrusion corresponding to the recess is formed in the suction member.

According to the invention, in the magnetic attraction device, the yoke has a prismatic shape, and has a hollow portion formed in a central axis direction of the prism, and at least one of the hollow portion. A magnetic attraction device characterized by comprising at least one groove extending in the direction along the central axis leading to the central axis, wherein a permanent magnet is mounted in the groove.

Further, according to the present invention, in the magnetic attraction device, a pair of the protrusions that are long in the width direction are arranged so as to sandwich the permanent magnet, and a plurality of pairs of the protrusions are disposed in the axial direction of the prism. And the suction members are elongated at a width direction, and are arranged at intervals in a direction along the central axis so as to correspond to the plurality of protrusions. A magnetic attraction device characterized by the following.

According to the present invention, there is provided the magnetic attraction device according to the magnetic attraction device, wherein the hollow portions are arranged in at least two rows in the width direction or the thickness direction of the prism. .

Further, according to the present invention, in the magnetic attraction device, the groove extends long in the length direction and is provided in plural in the width direction, and a pair of grooves are provided on both sides of the permanent magnet. The magnetic attraction device is characterized in that the protrusions are arranged at different axial positions between those provided on the adjacent permanent magnets.

[0038]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing a magnetic attraction member according to a first embodiment of the present invention. Referring to FIG. 1, the magnetic attraction member 5 includes a yoke 1 made of a columnar magnetic material. In the yoke 1, a ring-shaped hollow portion 2 having a square cross section and a hollow portion 2 from the outer peripheral surface 1a of the yoke 1 are provided.
And a groove 1b which penetrates and is provided in the circumferential direction. The groove 1b is provided with a ring-shaped permanent magnet 3. On the outer peripheral surface 1a of the yoke 1,
Protrusions 6 and 6 formed of a pair of magnetic plates having an arc-shaped cross section are provided so as to sandwich the permanent magnet 3 along the axial direction. The pair of protrusions 6, 6 are arranged along the outer peripheral surface 1 a of the yoke 1 at equal angular intervals with respect to the center axis of the yoke 1. In addition, hollow part 2
A winding part 4 wound in the hollow part 2 in a circumferential direction.
Is provided.

In the example shown in FIG. 1, the permanent magnet 3 is configured so that the upper end face is an N pole and the lower end face is an S pole.

In the magnetic attraction member 5, the permanent magnet 3 normally moves from the N pole on the upper end surface toward the upper side of the yoke 1 along the outer peripheral surface 1 a and toward the center along the upper end surface of the yoke 1. And bends down along the central axis of the yoke 1, bends along the lower end face, radially outward, bends on the outer peripheral side and rises again, and the S
A magnetic path that enters the pole is formed. Here, when a direct current is applied to the winding part 4 so as to form a magnetic path in a direction opposite to the magnetic path, the magnetic flux from the N pole is directed to the outside from the upper projecting part 6 which is the magnetic radiation surface. The yoke enters the attracting member made of a magnetic material (not shown), passes through the inside of the attracting member, and is again emitted toward another protrusion 6 at the lower part of the yoke, which is a magnetic incident surface, and And a magnetic path reaching the S pole is formed. Therefore, the attraction member is attracted toward the magnetic attraction surface, which is the surface of the pair of protrusions 6,6.

In the magnetic attracting member 5 according to the first embodiment of the present invention having such a structure, the magnetic flux is always radiated from the projecting portion and enters, so the exciting coil (winding portion)
And the loss of magnetomotive force due to this can be minimized. Also,
The number of poles can be increased, and therefore, the step angle can be reduced in the motor. further,
Since the configuration is simple, machining becomes easy and the number of parts can be reduced, so that cost can be reduced.
Further, by forming the protruding portion, the density of the magnetic flux can be increased, and the attraction force can be increased.

FIG. 2 is a partially cutaway perspective view showing a magnetic attraction member according to a second embodiment of the present invention. Referring to FIG. 2, the magnetic attraction member 10 has the same configuration as that according to the first embodiment, except that the shape and number of the protrusions 8 forming the magnetic radiation and incident surface are different. That is, the protrusion 8
Are prismatic, narrow in width, and are provided around them more than in the first embodiment. According to the second embodiment, since the number of projections 8, that is, the number of suction surfaces, is large, the step angle can be made smaller than that of the first embodiment. It has a similar effect.

FIG. 3 is a view showing a magnetic attraction member according to a third embodiment of the present invention. Referring to FIG.
The magnetic attraction member 15 includes a yoke 11 made of a cylindrical magnetic body having a hole 13 at the center. York 1
1, a ring-shaped hollow portion 12 having a square cross section and a groove 11b penetrating from the inner peripheral surface 11a of the yoke 1 to the hollow portion 12 and provided in the circumferential direction are provided. The ring-shaped permanent magnet 3 is mounted on the groove 11 b of the yoke 11. On the hole, that is, on the inner side surface of the yoke 11, there are provided a pair of protrusions 9, 9 made of a pair of magnetic materials so as to sandwich the permanent magnet 3 in the axial direction. A pair of protrusions 9,
Numerals 9 are arranged along the inner peripheral surface 11a of the yoke at equal angular intervals with respect to the center axis of the yoke 11. In the hollow part 12, a winding part 4 wound in the circumferential direction is provided.

In the example shown in FIG. 3, the upper end face of the permanent magnet 3 is an N pole, and the lower end face is an S pole. In the magnetic attraction member 15, normally, the upper end surface of the yoke 11 is bent from the N pole on the upper end surface of the permanent magnet 3 toward the upper side of the yoke 11 along the inner peripheral surface 11 a and at the position of the upper end surface. From the center toward the outside, and bend at the position of the outer peripheral surface 11c to form the outer peripheral surface 11c.
Along the lower end face, bends at the position of the lower end face, goes radially inward along the lower end face, bends at the position of the inner peripheral face, rises again, and forms a magnetic path into the S pole of the permanent magnet 3. Have been. Here, when the winding portion 4 is energized so as to form a magnetic path in a direction opposite to this magnetic path, the magnetic flux from the N pole is radiated from the upper protrusion 9 which is the magnetic emission surface toward the center. Then, it enters into an attracting member made of a magnetic material (not shown), and is discharged again toward another protruding portion 9 through the inside thereof, enters the inside of the yoke 11, and becomes the S pole which is the lower end surface of the permanent magnet. Is formed, and the attracting member is attracted toward the magnetic attracting surface including the protruding portions 9.

The magnetic attraction member according to the third embodiment having such a configuration is different from that of the first embodiment in that the attraction member is disposed on the outer peripheral surface of the yoke 11 and the inner peripheral surface of the yoke 11. It has the same effect as the embodiment.

FIG. 4 is a partially transparent perspective view showing a magnetic attraction device using a magnetic attraction member according to a fourth embodiment of the present invention. FIG. 5 is a partially cutaway exploded perspective view showing the magnetic attraction member of FIG. In the example of FIG. 4, a non-contact brake is shown as the magnetic attraction device.

Referring to FIG. 4, the non-contact brake 20
Are magnetic attraction members 21 arranged with their end faces facing each other.
And a suction member 22.

As shown in FIG. 5, the magnetic attraction member 21
The yoke 16 is formed of a columnar magnetic body having a columnar hole 18 at the center. Inside the yoke 16, a hollow portion 17 having a rectangular cross section is formed in a ring shape.
A ring-shaped groove 16 b is provided from one end surface of 6 to the hollow portion 17. The ring-shaped groove 16b is provided with a ring-shaped permanent magnet 19 having a height smaller than the depth of the groove 16b, that is, a height smaller than the depth of the groove. The substantially fan-shaped projections 23a and 23b project from the one end surface 16a of the yoke 16 and radially interpose the permanent magnet 19 at equal angular intervals with respect to the center axis of the yoke 16. It is provided as follows.

Returning to FIG. 4, the suction member 20 includes a substantially disk-shaped disk 24 having a boss 24a on one end surface. On the other end surface of the disk, that is, on the surface facing the magnetic attraction surface, the protrusions 25a, 2 having substantially the same shape as the protrusions 23a, 23b.
5b are provided at positions corresponding to the protruding portions 23a and 23b, respectively.

In the examples of FIGS. 4 and 5, the permanent magnet 1
9 such that the inner surface is an N pole and the outer surface is an S pole,
It is configured. In this magnetic attraction device 20, normally, the magnetic flux of the permanent magnet 19 is bent from the N pole on the inner surface toward the inner peripheral surface at a position close to the inner peripheral surface, and furthermore, the yoke 16 is moved along the central axis. Facing toward the lower side of the inner peripheral surface, it bends at a position near the lower end surface, goes outward from the center along the lower end surface of the yoke 16, bends at a position near the outer peripheral surface, and rises along the outer peripheral surface, It bends radially inward at a position close to the upper end face, and moves radially inward along the upper end face 16a.
A magnetic path that enters the pole is formed. Here, when a current is applied to the winding portion 4 so as to form a magnetic path in a direction opposite to this magnetic path,
The magnetic flux from the N pole is radiated upward from the protrusion 23b, which is a magnetic radiation surface, and the protrusion 25b
From the suction member 22, and is again emitted from another protrusion 25 a through the inside toward the protrusion 23 a, which is a magnetic incident surface.
6, a magnetic path reaching the S pole of the permanent magnet 19 is formed. Thereby, the attraction member 22 is attracted toward the magnetic attraction surface formed by the protrusions 23a and 23b of the magnetic attraction device. Accordingly, in the example shown in the drawing, when the protrusions 23a, 23b, 25a, 25b are sucked together, the suction force becomes a resistance force, and the rotation of the suction member 22 is stopped.

In the fourth embodiment of the present invention, the magnetic attraction surface and the attraction surface of the attraction member opposing the magnetic attraction surface are each formed to have a small area by the protrusion, so that the magnetic flux density increases. , The suction power can be increased. Further, the loss of the magnetomotive force due to the coil can be minimized. In addition, machining becomes easier and the number of parts decreases,
Therefore, cost can be reduced.

FIG. 6 is an exploded perspective view showing a non-contact brake as a magnetic attraction device using a magnetic attraction member according to a fifth embodiment of the present invention. FIG. 7 is a partially cutaway perspective view of the magnetic attraction member of FIG. Referring to FIG. 6, the non-contact brake 30 includes a magnetic attraction member 26 and attraction members 22, 22 'provided at both ends thereof.

As shown in FIGS. 6 and 7, the magnetic attraction member 26 has a yoke 27 made of a columnar magnetic body having a columnar hole 28 at the center. Inside the yoke 27, a hollow portion 29 having a rectangular cross section is formed in a ring shape,
Ring-shaped grooves 27c, 27d are respectively penetrated from both end surfaces 27a, 27b of the yoke 27 to the hollow portion 29.
Is provided. In the ring-shaped grooves 27c and 27d,
Ring-shaped permanent magnets 31a and 31b are provided respectively. Also, substantially fan-shaped protrusions 32a and 32b are provided so as to protrude on both end surfaces of the yoke 27 and to sandwich the permanent magnets 31a and 31b, respectively, in the radial direction.

Returning to FIG. 6, the suction members 22, 22 '
It has the same shape as the suction member 22 of FIG. That is, the suction members 22, 22 'include a substantially disk-shaped disk 24 having a boss 24a on one end surface. The other end of the disk 24,
In other words, the projections 25a and 25b having substantially the same shape as the projections 23a and 23b are provided on the surface facing the magnetic action surface formed by the projections 32a and 32b, respectively.

In the example of FIG. 6 and FIG.
6, the inner surface of the permanent magnet 31a on the upper end side is an N pole,
The outer side surface is configured as an S pole, while the inner side surface of the permanent magnet 31b at the lower end side of the magnetic attraction member 26 is configured as an S pole, and the outer side surface is configured as an N pole. In this magnetic attraction device, the permanent magnet 31a normally bends from the N pole on the inner surface of the permanent magnet 31a toward the inner peripheral surface, and further bends below the yoke along the central axis on the inner peripheral surface side. Permanent magnet 3 toward the side
1b, the magnetic path from the magnetic path entering the S pole and the N pole outside the permanent magnet 31b goes outward along the lower end surface of the yoke 27, bends toward the outer peripheral surface, rises along the outer peripheral surface, and approaches the upper end surface. And a magnetic path is formed along the upper end face toward the inside in the radial direction and entering the S pole of the permanent magnet 31a.

Here, when a current is applied to the winding portion 4 so as to form a magnetic path in a direction opposite to these magnetic paths, the magnetic flux from the N pole of the permanent magnet 31a at the upper end causes the projecting portion which is a magnetic emission surface to be formed. 3
2b, the light is radiated upward from the protrusion 2b, enters the inside from the protrusion 25b of the suction member 22, passes through the inside, and is again emitted toward the protrusion 32a from the other protrusion 25a, and enters the yoke 26 inside. Enter the permanent magnet 31a
Is formed, and the attracting member 22 is attracted toward the magnetic attracting surface forming the protruding portions 32a and 32b.

At the same time, the magnetic flux from the N pole of the lower permanent magnet 31b is radiated downward from the projection 32a, which is the magnetic emission surface, respectively, so that the projection 25a of the attraction member 22 '.
From the other protruding portion 25b, and is again emitted toward the protruding portion 32b from the other protruding portion 25b, and enters the yoke to form a magnetic path reaching the S pole of the permanent magnet 31b. , The suction member 22 'is provided with protrusions 32a, 32b
Is attracted toward the magnetic attraction surface formed by.

Therefore, in the example shown in the drawing, the protrusions provided on the respective end faces are sucked, so that
This suction force becomes a resistance force, and stops the rotation of the suction member.

Therefore, in the fifth embodiment of the present invention, similarly to the fourth embodiment, the magnetic attraction surface and the attraction surface of the attraction member opposed thereto are respectively formed by the projections.
Since the area is formed to be small, the magnetic flux density increases, and the attraction force can be increased.

Further, the loss of the magnetomotive force due to the coil can be minimized. In addition, machining becomes easy, and the number of parts is reduced, so that the cost can be reduced.

FIGS. 8 (a), (b), (c), and (d)
FIG. 8 is a plan view showing the rotational positions of the magnetic attraction member and the attraction member shown in FIGS. 6 and 7, respectively. The operation of the non-contact brake will be described based on a fifth embodiment.

As shown in FIG. 8A, the magnetic attraction member 2
6 and the protruding portion of the suction member 24 are in an overlapping state. At this point, energization of the winding unit 4 is started. When energized, the projecting portions 25a, 25b, 32
A suction force acts between a and 32b, which serves as a resistance to rotation.

As shown in FIG. 8 (b), when the suction member 24 further rotates, the overlapping area between the projections 32a, 32b and the projections 25a, 25b decreases, and the resistance begins to gradually decrease.

As shown in FIG. 8C, when the suction member 24 further rotates, the protrusions 32a and 32b and the protrusion 2
The overlapping area with 5a, 25b is further reduced, and the resistance is further reduced.

As shown in FIG. 8D, the protrusions 32a,
When the overlapping area between the protrusion 32b and the protruding portions 25a and 25b disappears, the resistance is minimized and the current is cut off. That is, when the power is continuously supplied, the protrusion 32
8A and 32B and the projections 25a and 25b overlap for the first time in the direction in which the overlapping area increases, because the suction force acts in the direction to increase the torque of the suction member 24, and FIG.
As shown in (a), power is not supplied until the protrusions 32a, 32b and the protrusions 25a, 25b completely overlap. Therefore, since the suction force acts in the direction in which the rotational torque is always reduced, the suction force becomes a resistance force, and the rotation can be stopped.

FIG. 9 is a partially cutaway perspective view showing a magnetic attraction member according to a sixth embodiment of the present invention.

As shown in FIG. 9, the magnetic attraction member 35
A yoke 33 made of a columnar magnetic material having a columnar hole 34 in the center is provided. Inside the yoke 33,
A hollow portion 36 having a rectangular cross section is formed in a ring shape, and inner and outer peripheral surfaces 33 a and 33 c and both end surfaces 33 b and 33 of the yoke 33 are formed.
d to the hollow portion 36, respectively, ring-shaped grooves 33
e, 33f and 33g, 33h are provided respectively.
The ring-shaped grooves 33e and 33f are provided with ring-shaped permanent magnets 37a and 37b, respectively.
33h are provided with ring-shaped permanent magnets 37c and 37d, respectively.

The substantially rectangular protrusions 38c, 38d and 3 protrude from the inner and outer peripheral surfaces of the yoke 33, respectively, and sandwich the permanent magnets 37a and 37b in the axial direction.
8e and 38f are provided at equal angular intervals in the circumferential direction of the inner peripheral surface and the outer peripheral surface, respectively. Further, substantially fan-shaped projections 38a, 38b and 38a ', 38b' are provided so as to project on both end surfaces 33b, 33d of the yoke 33, respectively, and to sandwich the permanent magnets 37c, 37d in the radial direction, respectively. ing.

In the magnetic attraction member 35 shown in FIG.
The suction member can be provided at any position so as to face the inner and outer peripheral surfaces and the upper and lower end surfaces.

In the example of FIG. 9, the permanent magnets 37a, 37a
7b, 37c, and 37d are mounted such that the magnetic pole surfaces of the permanent magnets 37a and 37c, 37c and 37b, 37b and 37d, and 37d and 37a, which are adjacent to each other, have opposite polarities in cross section. For example, the upper end surface of the permanent magnet 37a is the N pole, the lower end surface is the S pole, the upper end surface of the permanent magnet 37b is the S pole, the lower end surface is the N pole, the outer surface of the permanent magnet 37c is the S pole,
It is formed such that the inner surface is an N pole, the outer surface of the permanent magnet 37d is an N pole, and the inner surface is an S pole. In these permanent magnets 37a, 37b, 37c, and 37d, a magnetic path is formed from the N pole to the S pole of the adjacent permanent magnet, and therefore, as a whole, from the N pole on the upper end surface of the permanent magnet 37a, To form a magnetic path that moves radially inward along the upper end surface, descends along the inner peripheral surface, moves the lower end surface radially outward, and rises along the outer peripheral surface. You are doing.

Therefore, these permanent magnets 37a, 37
When an electric current is applied to the winding portion 4 so as to form a magnetic path in a direction to cancel the magnetic path formed by the b, 37c, and 37d, the magnetic flux from the N pole of the permanent magnets 37a, 37b, 37c, and 37d becomes magnetic. Projecting portions 38d, 38e, 38a, which are radiation surfaces,
Each of the projections 38a, 38b ', and 3 is radiated outward from the projections 38b, enters the interior from the projection of the suction member (not shown), passes through the interior, and again from another projection.
8d and 38e, and enter the inside of the yoke 33, and the respective permanent magnets 37a, 37b, 37c and 37
A magnetic path reaching the S pole of d is formed, and the attraction member is attracted toward the magnetic attraction surface.

Accordingly, in the example shown in the drawing, the protrusions provided on the respective end surfaces and the inner and outer peripheral surfaces are attracted to each other, so that the attracting force becomes a resistive force, and the rotation of the magnetic attracting member is stopped. Become.

Therefore, in the sixth embodiment of the present invention, similarly to the fourth and fifth embodiments, the protrusion 38
a, 38b, 38a ', 38b', 38c, 38d, 3
Since the magnetic attraction surface formed by 8e and 38f and the attraction surface opposed thereto are formed to have small areas, respectively, the magnetic flux density increases and the attraction force can be increased.

Further, it is possible to minimize the loss of the magnetomotive force caused by the coil of the winding portion. Further, the machining becomes easy and the number of parts is reduced, so that the cost can be reduced.

FIG. 10 is a partially cutaway perspective view showing a magnetic attraction member according to a seventh embodiment of the present invention.

As shown in FIG. 10, the magnetic attraction member 40
Has a yoke 41 made of a columnar magnetic body having a columnar hole 42 at the center. Inside the yoke 41, a hollow portion 36 having a rectangular cross section is formed in a ring shape, and ring-shaped grooves 41 e, 41 having a rectangular cross section respectively extend from the inner and outer peripheral surfaces 41 a, 41 b of the yoke 41 to the hollow portion 36.
f are provided respectively. Ring-shaped grooves 41e, 41f
Include ring-shaped permanent magnets 37a and 37b each having a rectangular cross section.
Are provided respectively.

The substantially rectangular projections 38c, 38d and 3d project on the inner and outer peripheral surfaces of the yoke 41, respectively, and sandwich the permanent magnets 37a and 37b in the axial direction, respectively.
8e and 38f are provided at equal angular intervals in the circumferential direction of the inner peripheral surface and the outer peripheral surface, respectively. Further, in the hollow portion 36,
Winding part 4 consisting of a conductor wound circumferentially in a hollow part
Is installed.

In the magnetic attraction member shown in FIG. 10, an attraction member can be provided at any position so as to face the inner and outer peripheral surfaces, respectively.

In the example of FIG. 10, the permanent magnets 37a,
37b is mounted so that the magnetic pole faces of the permanent magnets facing each other in the radial direction have opposite polarities in the cross section. For example, the upper end face of the permanent magnet 37a is formed as an N pole, the lower end face is formed as an S pole, the upper end face of the permanent magnet 37b is formed as an S pole, and the lower end face is formed as an N pole. These permanent magnets 37
a, 37b, respectively, the permanent magnets 37a, 37b
As a whole, a magnetic path is formed from the N pole to the S pole of the permanent magnet 37a. As a whole, the permanent magnet 37a bends downward and near the lower end face from the N pole on the lower end face, and further radially extends along the lower end face. Inward, at a position close to the inner peripheral surface, ascends along the inner peripheral surface, enters the S pole of the permanent magnet 37b, and
A magnetic path is formed such that the upper end surface moves radially outward at a position closer to the upper end surface from the N pole of the above, stops at a position closer to the outer peripheral surface, and descends along the outer peripheral surface. .

Therefore, when an electric current is applied to the winding portion 4 so as to form a magnetic field in a direction to cancel the magnetic path formed by the permanent magnets 37a and 37b, the magnetic flux from the N poles of the permanent magnets 37a and 37b becomes Projections 38d and 38e as magnetic radiation surfaces
, Respectively, are radiated in the radially inward and outward directions, enter the inside from a protrusion (not shown) of the suction member, pass through the inside, and again from another protrusion, and the protrusions 38c, 3c.
8f is released toward the inside of the yoke 41,
A magnetic path reaching the S pole of each of the permanent magnets 37a, 37b is formed, and the attracting members are formed by the protrusions 38c, 38d, and 38.
It is attracted toward the magnetic attraction surface formed by e and 38f.

Accordingly, in the illustrated example, the protrusions 38c, 38d and 38e, 38f provided on the inner and outer peripheral surfaces are provided.
When the suction member is sucked, the suction force becomes a resistance force, and the rotation of the suction member is stopped.

Therefore, in the seventh embodiment of the present invention, similarly to the sixth embodiment, the magnetic attraction surface and the attraction surface opposed thereto are formed to have small areas, respectively. The magnetic flux density increases, and the attraction force can be increased.

Further, since the winding portion is completely housed in the yoke, the loss of the magnetomotive force can be minimized. Furthermore, since the magnetic pole can be formed only by forming the protrusion, the number of poles can be increased and the step angle can be reduced. Also, the mechanism processing becomes easier,
Since the number of parts is reduced, cost can be reduced. Further, since the attractive force is generated only between the protruding portions, the magnetic flux can be converged, and therefore, the attractive force can be increased.

FIG. 11 is a partially cutaway perspective view showing an electromagnetic clutch as a magnetic attraction device using a magnetic attraction member according to an eighth embodiment of the present invention.

As shown in FIG. 11, the electromagnetic clutch 45
Has a magnetic attraction member 46 and an attraction member 50.

The magnetic attraction member 46 has a cylindrical portion 43c, a cylindrical portion 43a projecting from the cylindrical portion 43c in a cylindrical shape so as to share the outer peripheral surface with the cylindrical portion 43c, and an axially projecting portion from the center of the cylindrical portion 43c. And a yoke 43 made of a magnetic material having a central portion 43b. Inside the cylindrical portion 43c of the yoke 43, a hollow portion 44 having a rectangular cross section in a ring shape is provided.
Is formed from one end surface of the cylindrical portion 43c of the yoke 43 at one end where the cylindrical portion is formed.
, A ring-shaped groove 43d is provided.
A ring-shaped permanent magnet 37c is mounted in the ring-shaped groove 43d.

An arc-shaped projecting portion 47a is provided on the outer end surface of the cylindrical portion 43a of the yoke 43.
Further, on the inner peripheral surface of the cylindrical portion 43a, there are provided projections 47b projecting inward in the radial direction in an arc plate shape at the same angular position as the projections 47, respectively. Also, the central part 43
A projection 48b is provided on the outer peripheral surface of b, and a fan-shaped projection 48a is provided on an end surface of the central portion 43b, and the respective projections 48a, 48b and 47a, 47b are provided.
Are provided at the same angular position, and are formed in a shape facing each other with the permanent magnet 37c sandwiched in the radial direction by the projections 48a, 48b and 47a, 47b having the same radius.

On the other hand, the attraction member 50 is a disk-shaped disk portion 5.
1 and a shaft portion 52 protruding from one surface of the disk portion 51. On the other surface of the disk portion 51, a cylindrical portion 51b 'is provided, and in order from the outside in the radial direction to the inside, an arc-shaped protruding portion 54a and a circular cross section on both sides of the cylindrical portion 51b,
Plate-shaped protrusions 54b and 53a protruding in the axial direction and a fan-shaped protrusion 53b near the center are provided.

In such a magnetic attraction device 45, the magnetic attraction member 46 and the attraction member 50 are formed so as to engage with each other at one end. 47a, 47b, 48a,
48b and the projecting portions 54a, 54b, 53a, 53b are configured to face each other.

In the magnetic attraction device 45 shown in FIG. 11, the permanent magnet 37c
Are formed such that the magnetic poles on the inner peripheral surface are S poles and the magnetic poles on the outer peripheral surface are N poles. In the magnetic attraction member 46, it goes outward from the N pole of the permanent magnet 37c, descends along the outer peripheral surface, bends, moves radially inward along the lower end surface, and bends in the axial direction. , And the magnetic path is formed so as to again enter the S pole radially outward.

Therefore, when a current is applied to the winding portion 4 in the magnetic attraction member 46 so as to form a magnetic field in a direction to cancel the magnetic path formed by the permanent magnet 37c, the permanent magnet 37c
Magnetic flux from the N-pole of the projection 47a, which is a magnetic emission surface,
The projections 54a and 54b of the suction member 50 are radiated from the radial direction inward and the axial direction, respectively.
Enters the interior of the adsorption member 50, passes through the interior,
The magnetic flux is emitted from the protruding portions 53a and 53b toward the protruding portions 48a and 48b, enters the inside of the yoke 43, and forms a magnetic path reaching the S pole of the permanent magnet 37c. Receives a suction force in the direction.

Therefore, in the illustrated example, the protrusions provided on the respective end surfaces and the inner and outer peripheral surfaces are attracted to each other, so that the attracting force causes the attraction member 50 to rotate relative to the magnetic attraction member 46. Can be transmitted.

Therefore, in the eighth embodiment of the present invention, since the magnetic attraction surface and the attraction surface facing the magnetic attraction surface are formed to have small areas, loss of the magnetomotive force due to the coil is minimized. The magnetic flux density increases, and the attraction force can be increased. This also allows the magnetic flux to converge.

In addition, the number of parts is reduced due to ease of machining, and therefore the manufacturing cost can be reduced.

In the illustrated example, the electromagnetic clutch has been described. However, two types of members that transmit torque in the axial direction, for example, two types of members are connected in the axial direction which are not limited to whether or not rotation of a joint or the like is included. Can be used for coupling.

FIG. 12 is a partially cutaway exploded perspective view showing an electromagnetic clutch as a magnetic attraction device using a magnetic attraction member according to a ninth embodiment of the present invention.

The electromagnetic clutch shown in FIG. 12 has a structure in which the attracting members 50 shown in FIG. As shown in FIG. 12, the electromagnetic clutch 55 includes a magnetic attraction member 56 and a pair of attraction members 50 and 50 '.

The magnetic attraction member 56 has a cylindrical portion 57c, and cylindrical portions 57a, 57a, 57a, 57b, which protrude cylindrically from both ends in the axial direction so as to share the outer peripheral surface with the cylindrical portion 57c.
The yoke 57 is made of a magnetic material and has a central portion 57b, 57b 'protruding in the axial direction from the center of the cylindrical portion 57c. Inside the cylindrical portion 57c of the yoke 57, a hollow portion 58 having a quadrangular cross section is formed in a ring shape, and the ring shape extends from both end surfaces in the cylindrical portions 57a, 57a of the cylindrical portion 57c of the yoke 57 to the hollow portion 58. Groove 57
d, 57d 'are provided. Each ring-shaped groove 5
7d and 57d 'include ring-shaped permanent magnets 37c and 37d.
c 'are respectively mounted.

Also, the cylindrical portions 57a, 57 of the yoke 57
arc-shaped protruding portions 47 each protruding on the outer end face of a '
b, 47b 'are provided on the inner peripheral surface, and protruding portions 47a, 4 protruding radially inward in the shape of an arc plate.
7a 'is provided.

Projections 48b, 48b 'are provided on the outer peripheral surfaces of the center portions 57b, 57b', respectively, and fan-shaped protrusions 48a are provided on the end surfaces of the center portions 57b, 57b ', respectively. , 48a 'are provided, and the respective protrusions 48a, 48a', 48b, 48b 'and 47a, 47
a ', 47b, 47b' are provided at equiangular positions, respectively, and the protrusions 48a, 48b, 47a,
The permanent magnets 37c, 37c 'are sandwiched in the radial direction by 47b and 48a', 48b ', 47a', 47b ', respectively.

On the other hand, the suction member 50 is a disk-shaped disk portion 5.
1a, a shaft portion 52 protruding on one surface of the disk surface, and a cylindrical portion 51b protruding in a cylindrical shape on the other surface. The other surface of the disk portion 51a extends in the axial direction from the outside to the inside in the radial direction in the order of the arc-shaped protrusion 54a and the arc-shaped cross section provided on the inner and outer peripheral surfaces of the cylindrical portion 51b. Plate-shaped projections 54b and 53a, and a fan-shaped projection 53b provided at the center.

Similarly, the suction member 50 'includes a disk-shaped disk portion 51a', a shaft portion 52 'protruding from one surface of the disk surface, and
On the other surface, a cylindrical portion 51b 'protruding in a cylindrical shape is provided. Also, on the other surface of the disk portion 51a ', in order from the outside in the radial direction to the inside, an arc-shaped protruding portion 54a' and an arc-shaped cross-section provided on the inner and outer peripheral surfaces of the cylindrical portion 51b ', respectively And a fan-shaped projection 53b 'provided at the center.

In the magnetic attraction device 55 having such a configuration, the magnetic attraction member 56 and the attraction members 50 and 50 'are formed so as to engage with each other at their respective ends. In the rotational position of
a, 47b, 48a, 48b and protrusions 54a, 54b,
53a, 53b and projections 47a ', 47b', 48
a ', 48b' and the projections 54a ', 54b', 53
a ', 53b'.

In the magnetic attraction device 55 shown in FIG. 12, the permanent magnets 37c and 37c 'have, in cross section, an S-pole on the inner peripheral surface of the permanent magnet 37c and an N-pole on the outer peripheral surface thereof.
The poles and the magnetic poles on the inner peripheral surface of the permanent magnet 37c 'are formed as N poles and the magnetic poles on the outer peripheral surface are formed as S poles.

Here, in the magnetic attraction member 56, the magnetic flux goes outward from the N pole of the permanent magnet 37c, descends along the outer peripheral surface, bends, and radially inwards along the lower end surface. While moving and entering the S pole of the permanent magnet 37c ', the magnetic flux from the N pole of the permanent magnet 37c' moves inward in the radial direction along the lower end surface, bends, rises in the axial direction, and returns to the radius again. A magnetic path is formed so as to enter the S pole of the permanent magnet 37'c toward the outside in the direction.

Therefore, these permanent magnets 37c, 37
When a current is applied to the winding part 4 so as to form a magnetic field in a direction to cancel the magnetic path formed by c ', the permanent magnets 37c and 37
Magnetic flux from the N-pole of c ′ is radiated radially inward and axially from the protrusions 47a and 47b, which are magnetic emission surfaces at one end, respectively.
a, 54b, enter the interior of the suction member 50, pass through the interior, and from the protruding portions 53a, 53b to the protruding portions 48a,
The magnetic flux is emitted toward 48b, enters the inside of the yoke 57, and a magnetic path reaching the S pole of the permanent magnet 37c is formed, so that the attracting member 50 receives an attractive force in a direction toward the magnetic attractive surface.

At the same time, the projection 4 which is the magnetic emission surface at the other end
8a ', 48b' are radiated radially outward and axially, respectively, and project from the protrusion 5 of the suction member 50 '.
3a 'and 53b' enter the interior of the suction member 50 ', pass through the interior, and from the protrusions 54a' and 54b ',
The magnetic flux is released toward the protruding portions 47a 'and 47b' and enters the inside of the yoke 57 to form a magnetic path to the S pole of the permanent magnet 37c '. Receive strength.

Therefore, in the illustrated example, the projections 47a, 47b, 4 provided on the respective end surfaces and the inner and outer peripheral surfaces are provided.
When the suction members 8a, 48b, 54a, 54b, 53a, and 53b are sucked from each other, the suction force can transmit the rotation of the suction member relative to the magnetic suction member.

Therefore, in the ninth embodiment of the present invention, since the magnetic attraction surface and the attraction surface opposed thereto are formed to have small areas, the magnetic flux density increases and the attraction force increases. be able to.

The ninth embodiment has been described as being used for an electromagnetic clutch. However, similarly to the eighth embodiment, a shaft transmitting torque in the axial direction, such as a joint or the like, may be used. The present invention can be used for a coupling for coupling two kinds of members in an axial direction which is not limited to whether rotation is included or not.

FIG. 13 is a perspective view showing a linear motor as a magnetic attraction device using a magnetic attraction member according to a tenth embodiment of the present invention. FIG. 14 is a perspective view showing the magnetic attraction member of FIG.

Referring to FIGS. 13 and 14, the linear motor 60 has a magnetic attraction member 65 as a movable member and an attraction member 66 as a fixed member.

As best shown in FIG. 14, the magnetic attraction member 65 has a yoke 61 having a cylindrical shape with a substantially square cross section. The yoke 61 includes a hollow portion 61 a having a square cross section formed in the axial direction, and a groove 61 b extending along the axial direction from the lower end surface of the yoke 61 to the hollow portion. A rod-shaped permanent magnet 62 is provided in the groove 61b.
Is installed.

On both sides of the permanent magnet surface at the lower end surface of the yoke 61, prism-shaped projections 64a and 64b extending in the width direction are formed. The pair of protrusions 64a, 64b
They are formed side by side at equal intervals in the axial direction.

Further, in the figure, although both end faces are shown cut off, the winding portion 63 penetrating through the hollow portion 61a and extending in the axial direction above the yoke to form a track-like coil. Is provided.

Referring to FIG. 13, the adsorbing member 66 is provided with a prismatic adsorbing material 66a extending along the width direction of the yoke at an interval equal to the axial interval between the pair of protrusions 64a and 64b in the axial direction. Have been.

In the linear motor 60 having such a configuration, the magnetic path formed by the permanent magnet 62 is formed clockwise in a cylindrical cross section toward the right in the illustrated example. Here, when a DC pulse current is applied to the winding portion 63 in a direction to cancel the magnetic path, the magnetic flux emitted from the N pole of the permanent magnet 62 is emitted to the outside from the projecting portion 64b provided at the lower end of the yoke 61. The adsorbent 66a is discharged, enters the opposing portion of the adsorbent 66a, passes through the adsorbent 66a, and is discharged from the opposing portion of the adsorbent 66a to the protruding portion 64a toward the protruding portion 64a. The yoke 61 enters the yoke 61 through the magnetic field, and forms a magnetic path to the S pole of the permanent magnet 62, so that an attractive force is generated between the protrusions 64a and 64b and the adsorbent 66a.

The magnetic attraction member 65 is generated by this attractive force.
Moves rightward in the figure.

Therefore, the protrusions 64a and 64b are
5, the direct current supply is turned on when approaching, and O when passing over the adsorbent 65.
When a DC pulse current such as an FF is applied to the winding portion 63, the magnetic attraction member 65 is attracted by the attraction force when the current is applied, and the protrusions 64a, 6a on the adsorbent 66a.
Since the current is interrupted when 4b passes, the magnetic attraction member always moves rightward due to the inertial force.

FIG. 15 is a perspective view showing a magnetic attraction member according to an eleventh embodiment of the present invention.

Referring to FIG. 15, in the magnetic attraction member 67 according to the eleventh embodiment, the axial size and pitch of the yoke 61 at the lower end of the yoke 61 are greater than those according to the tenth embodiment. It has the same configuration except that it is formed to be approximately half as short.

Therefore, the attracting member can be driven in the same manner as that of the tenth embodiment by using an adsorbing member having a pitch corresponding to the pitch of the magnetic attracting member arranged in the axial direction. .

FIG. 16 is a perspective view showing a linear motor as a magnetic attraction device using a magnetic attraction member according to a twelfth embodiment of the present invention. FIG. 17 is a perspective view of the magnetic attraction member of FIG. 16 as viewed from below.

Referring to FIG. 16, a linear motor 70
Has a magnetic attraction member 75 as a movable member and an attraction member 76 as a fixed member.

Referring to FIGS. 16 and 17, the magnetic attraction member 75 includes a yoke 71 having a rectangular column shape with a substantially rectangular cross section. The yoke 71 includes three hollow portions 71a formed in the axial direction and arranged in the width direction. Grooves 71b extending in the axial direction are formed from the lower end surface of the yoke 71 to the respective hollow portions. A rod-shaped permanent magnet 62 is mounted in each of the grooves 71b. The permanent magnet is formed such that both side surfaces facing each other in the width direction are magnetic pole surfaces, and the adjacent side surfaces have the same magnetic pole.

In the illustrated example, the side surfaces of the permanent magnet 62 are N pole, S pole, S pole, N pole, N pole, and S pole from the near side.

Each of the permanent magnets 62 on the lower end surface of the yoke 71
A pair of protrusions 68 extending in the width direction are provided on both sides of the surface.
a, 68b, 68c, 68d and 68e, 68f are formed. As shown in FIG. 17, the pair of protrusions are formed side by side at equal intervals in the axial direction. Each pair of protrusions 68a, 68b, 68c, 68d, 68e, 68 adjacent to each other in the width direction.
f is formed such that the phases are shifted from each other in the length direction.

A track-like coil extending in the axial direction is formed above the yoke 71 by penetrating through each of the hollow portions 71a and exposed to the outside from the hollow portions 71a and bending in a U-shape. Winding part 63 is provided.

Referring to FIG. 16, the adsorbing member 76 has a rectangular prism-shaped adsorbing material 7 extending along the width direction of the yoke 71.
6a is a pair of protrusions 68a, 68b, 68 in the axial direction.
C, 68d, 68e, and 68f are provided at intervals equal to the intervals in the axial direction.

In the linear motor 70 having such a configuration, the magnetic path formed by the permanent magnets 62 draws a loop in the yoke in a direction from the N pole to the S pole of each permanent magnet in the illustrated example. Like canceling this loop,
When a current is applied to each of the coils, the protrusions 68a, 68d, 68e arranged near the N pole of each permanent magnet
The magnetic flux is emitted toward the adjacent magnetic material 76a, passes through the inside of the magnetic material 76a, and projects from the adsorbent 76a.
b, 68c, and 68f, projecting portions 76a
And enters the yoke 71 through the protrusions 68b, 68c, 68f to form a magnetic path to the S pole of each permanent magnet, and an attractive force is generated between the protrusion and the adsorbent. appear. By this attraction force, the magnetic attraction member moves rightward in the figure.

Therefore, the DC pulse currents having phases shifted from each other such that the DC current is turned on when the protruding portion approaches the adsorbent and turned off when passing over the adsorbent are applied to the respective windings. When the magnetic attraction member is applied to the wire portion, the magnetic attraction member is interrupted by the attraction force when a current is applied, and when the respective protrusions pass over the attraction member, the current to the respective winding portions is interrupted. Always moves to the left.

FIG. 18 is a perspective view showing a magnetic attraction member according to a thirteenth embodiment of the present invention. Referring to FIG. 18, the magnetic attraction member 80 includes a yoke 78 having a prism shape with a substantially rectangular cross section. The yoke 78 includes two hollow portions 78a formed in the axial direction and arranged in the height and width directions. The respective hollow portions 78 from the upper and lower end surfaces of the yoke 78
a, grooves 78b, 7 extending along the axial direction to reach
8c are respectively formed. These grooves 78b, 78c
Are provided with bar-shaped permanent magnets 62, respectively.

The permanent magnet 62 is formed such that both side surfaces are magnetic pole surfaces, and the corresponding side surfaces have magnetic poles of the same polarity.

In the illustrated example, the front side of the permanent magnet 62 has an N pole, and the rear side has an S pole.

A pair of protrusions 68 extending in the width direction are provided on both sides of the upper and lower end surfaces of the yoke 78 on the respective permanent magnet surfaces.
a, 68b are formed. The pair of protrusions 68
a, 68b are formed side by side at equal intervals in the axial direction.

A winding 63 is formed to penetrate each of the pair of hollow portions 71a and to form a track-like coil across the pair of hollow portions 71a.

[0138] At both end surfaces of the magnetic attraction member, attraction members having the same configuration as that of FIG. 16 are arranged.

In the case where a linear motor is constituted by such a magnetic attraction member, the magnetic path formed by the permanent magnet 62 is, in the illustrated example, in the direction from the north pole to the south pole of each permanent magnet 62, Draw a loop in 78.

Here, when an electric current is applied to the winding portion 63 so as to cancel this loop, the magnetic flux flows from the protruding portions 68a arranged near the N pole of each permanent magnet 62 toward the adjacent magnetic material. Is released, passes through the inside of the magnetic material, is released from the portion facing the protrusion 68b of the adsorbent toward the protrusion 68b, enters the inside of the yoke 78 through the protrusion 68b, and A magnetic path leading to the S pole 62 is formed, and an attractive force is generated between the protrusions 68a and 68b and an adsorbent (not shown). This attraction force causes the magnetic attraction member to move.

Therefore, when the projecting portions 68a and 68b approach the adsorbent, the DC pulse current is turned on, and turned off when passing over the adsorbent.
If applied to the windings, the magnetic attraction member is cut off by the attraction force when current is applied, and the current to the respective windings is cut off when each protrusion passes over the attraction member. In such a case, it always moves to the left due to inertial force.

FIG. 19 is a perspective view showing a linear motor as a magnetic attraction device using a magnetic attraction member according to a fourteenth embodiment of the present invention.

Referring to FIG. 19, linear motor 85
Has a magnetic attraction member 85 'as a movable member and adsorption members 82 and 82' as fixed members.

Referring to FIG. 19, the magnetic attraction member 75
Is provided with a yoke 81 having a prism shape with a substantially rectangular cross section. The yoke 81 includes three hollow portions 81a, 81b, and 81c formed in the axial direction and arranged in the width direction, two in the height direction. Grooves 81e, 81e ', 81f, 8 extending along the axial direction from the upper and lower end surfaces of the yoke 81 to the respective hollow portions 81a, 81b, 81c.
1f ', 81g and 81g' are formed respectively.

The grooves 81e, 81e ', 81f, 8
Rod-like permanent magnets 62 are mounted on 1f ', 81g, and 81g', respectively. The permanent magnet 62 is formed such that both side surfaces facing each other in the width direction are magnetic pole surfaces.
Adjacent side surfaces are configured to have the same magnetic pole.

Further, the upper and lower permanent magnets 62 have the same polarity magnetic poles on the same side surfaces corresponding to the upper and lower sides, respectively.
Is formed.

In the example shown, the sides of the permanent magnet are:
In both upper and lower rows, N pole, S
The order is pole, south pole, north pole, north pole, and south pole.

As shown in FIG. 17, a pair of protrusions 68a, 68b, 68c, 68 extending in the width direction are provided on both sides of the upper and lower end surfaces of the yoke 81 on the respective permanent magnet surfaces.
d, and 68e and 68f are formed. The pair of protrusions are formed side by side at equal intervals in the axial direction, as best shown in FIG. A pair of protrusions 68a, 68b adjacent to each other in the width direction;
c, 68d and 68e, 68f are formed out of phase in the length direction.

Further, there are provided winding portions 63a, 63b and 63c which penetrate each of the pair of upper and lower hollow portions 81a, and form a U-shaped track-shaped coil at both ends.

On the other hand, the suction members 82 and 82 '
One prismatic adsorbent 82 extending along the width direction of one
a, 82a 'extend axially in the pair of protrusions 68a, 68a.
b, 68c, 68d, 68e, and 68f are arranged at intervals equal to the intervals in the axial direction.

In the linear motor 85 having such a configuration, the magnetic path formed by the permanent magnets 62 is, in the illustrated example, between the upper and lower hollow portions in the direction from the N pole to the S pole of each permanent magnet 62. A loop is drawn in the yoke 81 so as to pass through. When a current is applied to each coil so as to cancel this loop, the protruding portions 68a, 68d, 68e arranged near the N pole of each permanent magnet 62 cause the adjacent magnetic materials 82a, 82a 'to move from the respective protruding portions 68a, 68d, 68e. The magnetic flux is emitted toward each of the magnetic members 82a and 82a ', and the protrusions 68b, 68c and 68f of the adsorbents 82a and 82a'.
Are emitted toward the projections 68b, 68c, 68f from the portion opposing the ridge, and enter the inside of the yoke 81 via the projections 68b, 68c, 68f to form a magnetic path to the S pole of each permanent magnet 62. And the projections 68a, 68b, 68c,
A suction force is generated between 68d, 68e, 68f and the adsorbents 82a, 82a '. The magnetic attraction members 82 and 82 'move rightward in the drawing due to this attractive force.

Therefore, the protrusions 68a, 68b, 68c,
When 68d, 68e and 68f approach the adsorbents 82a and 82a ', the direct current is turned on, and the adsorbent 82a is turned off.
a, 82 a ′ are turned off when passing through the respective winding portions 63.
a, 63b, 63c, the magnetic attraction members 82, 8
Reference numeral 2 'denotes a suction force when an electric current is applied, and the protrusions 68a, 68a on the adsorbents 82a, 82a'.
When b, 68c, 68d, 68e, and 68f pass, the current to each of the winding portions 63a, 63b, and 63c is cut off, so that the motor always moves rightward due to the inertial force.

FIG. 20 is a perspective view showing a rotary motor as a magnetic attraction device using a magnetic attraction member according to a fifteenth embodiment of the present invention. FIG. 21 is a perspective view showing a main part of the rotor of FIG. FIG. 22 is a perspective view showing a main part of the stator of FIG. FIG. 23 is a perspective view showing a suction member used in the stator of FIG.

Referring to FIG. 20, a rotary motor 90 as a magnetic attraction device includes a rotor 87 having a magnetic attraction member.
And a stator 8 as a suction member disposed therearound.
6 is provided.

Referring to FIG. 21, magnetic attraction member 87
Are a plurality of magnetic attraction members 91 connected in the direction of the rotating shaft 88.
It has. The plurality of magnetic attraction members 91 project outward at equal angular intervals on the outer peripheral surface in the radial direction (in the example of FIG.
) A pair of magnetic plates 92 having protrusions 95, 95, ...
a and 92b, and the yoke 92a,
And a ring-shaped permanent magnet 93 sandwiched between 92b. Further, a winding portion 94 is accommodated in a space in the yoke formed by the permanent magnet 93 and the rotation shaft.

Each magnetic attraction member 91 of the magnetic attraction member 87
Are formed such that the phases of the protrusions 95 are slightly shifted from each other around the rotation axis.

Referring to FIG. 22, the stator 86 is composed of eight substantially prismatic suction members 98 arranged at an equiangular position with respect to the central axis in the case 97.

As shown in FIG. 23, in the suction member 98, the cross section of the outer peripheral surface and the inner peripheral surface is formed in an arc shape centering on the rotation axis, and both side surfaces are formed substantially in the radial direction. However, it may be formed larger than the central angle of the arc formed by the outer peripheral surface and the inner peripheral surface.

In the rotary motor 90 according to the fifteenth embodiment of the present invention having such a configuration, when the attraction member 98 and each of the protrusions 92 of the magnetic attraction members 91a to 91f start to overlap in the radial direction, that is, , Magnetic attraction bodies 91a to 91
When the one side surface of the protrusion 92 of the f is coincident with the one side surface of the attraction member 98, the power is supplied, and at the position where one side surface of the protrusion 92 of the magnetic attraction members 91a to 91f has passed the other side surface of the attraction member 96. Power supply is cut off.

In the example shown in FIG.
a, 91b and 91d are energized, and the magnetic attraction members 91c and 9
No electricity is supplied to 1e and 91f.

That is, with respect to the magnetic attraction members 91a to 91b, the phases of the magnetic attraction members adjacent to each other are 1 unit.
Currents shifted by 20 degrees are passed through the respective winding portions. At this time, the magnetic flux emitted from the protrusion 92a of each magnetic attraction body on the side in contact with the N pole of the permanent magnet 93 enters the attraction member 98 and passes through the at least one other protrusion 9
2b, enters the magnetic attraction bodies 91a and 91b, and forms a magnetic path to the S pole of the permanent magnet 93. Eventually, the attracting member is formed on the magnetic attraction surface formed by the protrusions 92a and 92b. 98 will be aspirated. This suction force is converted into a rotation torque of the rotor 87 of the rotation motor 90,
The rotation motor 90 rotates. Such magnetic attraction is provided in parallel, and the magnetic attraction members 91a to 91f having slightly different phases are provided.
Therefore, the rotor of the rotary motor 90 always rotates when energized.

In the fifteenth embodiment of the present invention, a DC pulse current is applied to each winding portion. However, a three-phase alternating current and a reverse-polarity whose phases are shifted from each other by 180 degrees are used. A similar effect can be obtained by flowing three-phase alternating currents to the three near sides and the three near sides, respectively.

FIG. 24 is a plan view showing a rotary solenoid as a magnetic attraction device using a magnetic attraction member according to a sixteenth embodiment of the present invention. FIG. 25 is a plan view showing a state when power is supplied to the rotary solenoid of FIG.

Referring to FIG. 24, a rotary solenoid 100 has a fixed magnetic attraction member 101 and an attraction member 102 disposed around the magnetic attraction member 101 and rotatable relative to the magnetic attraction member 101. are doing. The magnetic attraction member 101 has the same configuration as the magnetic attraction member 10 or the magnetic attraction body 87 as shown in FIGS.

On the other hand, the suction member 102 has the same cross-sectional shape as the suction member (stator) 86 shown in FIG. Further, the suction member 102 is provided with a support portion 107a that protrudes outward in the radial direction.
The other end of the coil spring 108 fixed to another supporting portion 109 is connected.

In the state shown in FIG. 24, when electricity is supplied to the winding portion, the attraction members 107b are attracted by the protruding portions 108, and as a result, the protruding portions 107b are
8 against the return force of the spring,
02 rotates and stops at the rotation position shown in FIG.

On the other hand, when the current is cut off,
Then, the attraction force with the magnetic attraction member 101 is lost, and the spring returns to the position shown in FIG. 24 by the return force of the spring.

The thus constructed rotary solenoid 10
0 is a rotary actuator, for example, a key of a safe,
The present invention can be used for a crossing breaker at a railroad crossing, an excitation device for an electromagnetic valve, a rotary actuator such as an electric toothbrush, and a product supply operation part of a vending machine.

FIG. 26 is a plan view showing a rotary solenoid as a magnetic attraction device using a magnetic attraction member according to a seventeenth embodiment of the present invention. FIG. 27 is a plan view showing a state when power is supplied to the rotary solenoid of FIG.

Referring to FIG. 26, rotary solenoid 110 has a fixed magnetic attraction member 111 and an attraction member 112 disposed inside magnetic attraction member 111 and rotatable relative to magnetic attraction member 111. are doing. The magnetic attraction member 111 has the same configuration as the magnetic attraction member 15 as shown in FIG.

On the other hand, the attracting member 112 is provided with a protruding portion 116 which is long in the axial direction and arranged around the cylindrical central axis at the same angular position as the protruding portion 118 of the magnetic attraction member 111. The adsorbing member 112 is provided with a support portion 119 protruding outward in the radial direction.
The other end of the coil spring 106 fixed to the support 109 is connected.

In the state shown in FIG. 26, when electricity is supplied to the winding portion, the attracting members 116 are attracted by the projecting portions 118, and as a result, the coil springs 106 are moved in the direction in which the projecting portions 116 overlap the projecting portions 118. The suction member 112 rotates against the return force and stops at the rotation position shown in FIG.

On the other hand, when the current is cut off,
Then, the attraction force with the magnetic attraction member 111 is lost, and the spring returns to the position of FIG. 27 by the return force.

The rotary solenoid having such a structure is as follows.
As the rotary actuator, for example, it can be used for an actuator such as a safe key, a level crossing circuit breaker, an electromagnetic valve excitation device, and an electric toothbrush.

[0175]

As described above, according to the present invention,
Also in various magnetic attraction devices, a magnetic attraction member that can increase energy efficiency can be provided.

Further, according to the present invention, it is possible to provide a magnetic attraction device using the above-described magnetic attraction member.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a magnetic attraction member according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing a magnetic attraction member according to a second embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view showing a magnetic attraction member according to a third embodiment of the present invention.

FIG. 4 is a partially cutaway exploded perspective view showing a magnetic attraction device using a magnetic attraction member according to a fourth embodiment of the present invention.

FIG. 5 is a partially cutaway perspective view showing the magnetic attraction member of FIG. 4;

FIG. 6 is a partially cutaway exploded perspective view showing a non-contact brake as a magnetic attraction device using a magnetic attraction member according to a fifth embodiment of the present invention.

FIG. 7 is a partially cutaway perspective view of the magnetic attraction member of FIG. 6;

8 (a), (b), (c) and (d) are plan views showing rotational positions of the magnetic attraction member and the attraction member shown in FIGS. 6 and 7, respectively.

FIG. 9 is a partially cutaway perspective view showing a magnetic attraction member according to a sixth embodiment of the present invention.

FIG. 10 is a partially cutaway perspective view showing a magnetic attraction member according to a seventh embodiment of the present invention.

FIG. 11 is a partially cutaway exploded perspective view showing an electromagnetic clutch as a magnetic attraction device using a magnetic attraction member according to an eighth embodiment of the present invention.

FIG. 12 is a partially cutaway exploded perspective view showing an electromagnetic clutch as a magnetic attraction device using a magnetic attraction member according to a ninth embodiment of the present invention.

FIG. 13 is a perspective view showing a magnetic attraction member according to a tenth embodiment of the present invention.

FIG. 14 is a perspective view showing a linear motor as a magnetic attraction device using the magnetic attraction member of FIG.

FIG. 15 is a perspective view showing a magnetic attraction member according to an eleventh embodiment of the present invention.

FIG. 16 is a perspective view showing a linear motor as a magnetic attraction device using a magnetic attraction member according to a twelfth embodiment of the present invention.

FIG. 17 is a perspective view of the magnetic attraction member of FIG. 16 as viewed from below.

FIG. 18 is a perspective view showing a magnetic attraction member according to a thirteenth embodiment of the present invention.

FIG. 19 is a perspective view showing a linear motor as a magnetic attraction device using a magnetic attraction member according to a fourteenth embodiment of the present invention.

FIG. 20 is a perspective view showing a rotary motor as a magnetic attraction device using a magnetic attraction member according to a fifteenth embodiment of the present invention.

FIG. 21 is a perspective view showing a main part of the rotor of FIG. 20;

FIG. 22 is a perspective view showing a main part of the stator of FIG. 20;

FIG. 23 is a perspective view showing a suction member used in the stator of FIG. 22;

FIG. 24 is a plan view showing a rotary solenoid as a magnetic attraction device using a magnetic attraction member according to a sixteenth embodiment of the present invention.

FIG. 25 is a plan view showing a state when power is supplied to the rotary solenoid of FIG. 24;

FIG. 26 is a plan view showing a rotary solenoid as a magnetic attraction device using a magnetic attraction member according to a seventeenth embodiment of the present invention.

FIG. 27 is a plan view showing a state when power is supplied to the rotary solenoid of FIG. 26;

FIG. 28 is a cross-sectional view showing a conventional hybrid magnet.

FIG. 29 is a view showing an example of an electric motor using the hybrid magnet of FIG. 27;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Yoke 1a Outer peripheral surface 1b Groove 2 Hollow part 3 Permanent magnet 4 Winding part 5 Magnetic attraction member 6 Projection part 8 Projection part 10 Magnetic attraction member 11 Yoke 11a Inner peripheral surface 11b Groove 12 Hollow part 13 Hole part 15 Magnetic attraction member 16 Yoke 16b Groove 17 Hollow portion 18 Hole portion 19 Permanent magnet 20 Non-contact brake 21 Magnetic attraction member 22 Attraction member 22, 22 'Attraction member 23a, 23b Projection 24 Disk 25 Boss 26 Magnetic attraction member 28 Hole 27 Yoke 27a , 27b Both end surfaces 27c, 27d Groove 29 Hollow portion 31a, 31b Permanent magnet 32a, 32b Projection portion 33 Yoke 33a, 33c Inner / outer peripheral surface 33b, 33d Both end surfaces 33e, 33f, 33g, 33h Groove 34 Hole 35 Magnetic attraction member 36 Hollow portions 37a, 37b, 37c, 37d Permanent magnets 38a, 38b, 3 8c ', 38d' Projecting portion 38c, 38d, 38e, 38f Projecting portion 40 Magnetic attraction member 41 Yoke 41a, 41b Inner / outer peripheral surface 41e, 41f Groove 42 Hole 43 Yoke 43a Cylindrical portion 43b Center 43c Column 43d Groove 44 Hollow Part 45 Electromagnetic clutch (magnetic suction device) 46 Aeromagnetic suction members 47a, 47a ', 47b, 48a, 48b Projections 50, 50' Suction members 51a, 51a 'Disk portions 51b, 51b' Cylindrical portion 52 Shaft portion 53a, 53b, 54a, 54b Projecting portion 55 Electromagnetic clutch 56 Magnetic attraction member 57 Yoke 57a, 57a 'Cylindrical portion 57b, 57b' Central portion 57c Column portion 57d, 57d 'Groove 58 Hollow portion 60 Linear motor 61 Yoke 61a Hollow portion 61b Groove 62 Permanent magnet 63, 63a, 63b, 63c Winding part 64 a, 64b Projecting portion 65 Magnetic attraction member 66 Attraction member 66a Adsorbent 68a, 68b, 68c, 68d, 68e, 68f
Projection 70 Linear motor 71 Yoke 71a Hollow portion 71b Groove 75 Magnetic attraction member 76 Attraction member 76a Magnetic material 78 Yoke 78a Hollow portion 78b, 78c Groove 80 Magnetic attraction member 81 Yoke 81a, 81b, 81c, 81e, 81e ', 81f,
81f ', 81g, 81g' Groove 82, 82 'Magnetic attracting member 82a, 82a' Magnetic material 85 Linear motor 86 Stator 87 Rotor 88 Rotating shaft 90 Rotating motor 91 Magnetic attracting members 91a to 91f Magnetic attracting members 92a, 92b Magnetic plate 93 Permanent magnet 94 Winding part 95 Protrusion part 96 Attraction member 97 Case 98 Attraction member 100 Rotary solenoid 101 Magnetic attraction member 102 Attraction member 103a Projection 106 Coil spring 108 Projection 109 Support part 110 Rotary solenoid 111 Magnetic attraction member 112 Attraction member 118 Projection Part 151 electromagnet 153 base 154 leg 155 yoke 156 excitation coil 157 permanent magnet 158 magnetic material 160 movable member 161 sliding member 162 base 163 hole 164 mounting plate 165 movable member 170 electric motor

 ──────────────────────────────────────────────────続 き Continuing from the front page (71) Applicant 500456899 Environmental city consulting Co., Ltd. 6302 Tamura, Hiratsuka-shi, Kanagawa (72) Inventor Sanshiro Ogino 2-20-1 Futaba 2-chome, Shinagawa-ku, Tokyo 405 (72 Inventor Yasumi Ochiai 306-32-2-306 Takaishi, Aso-ku, Kawasaki City, Kanagawa Prefecture (72) Inventor Yoshitake Nishi 2-39-7, Daizawa, Setagaya-ku, Tokyo (72) Inventor Kazuya Oguri, Sagamihara City, Kanagawa Prefecture 5-6-1 Kamizuruma Rene Higashi Rinkan A-111 (72) Inventor Tetsu Nakatsuka 2-31-3 Takamori, Isehara-shi, Kanagawa F-term (Reference) 5E048 AB06 AC05 CA01 5H641 BB06 GG02 GG04 GG06 GG08 HH02 HH04 HH10 5H649 BB02 BB03 GG02 GG05 GG08 GG16 GG17 GG18 HH08 HH13 HH16 HH17 HH18

Claims (27)

[Claims] At least two ends of a yoke made of a soft magnetic material are connected to both ends of a permanent magnet to form a magnetic circuit, and a winding portion is provided on the yoke, and is formed in the yoke by the permanent magnet. By applying a current to the winding portion so as to apply a magnetic field in a direction to cancel the magnetic path, a magnetic flux is emitted from the magnetic emission surface of the yoke adjacent to the permanent magnet, so that the magnetic material is removed. A magnetic attraction member for attracting, wherein a protrusion is provided on the magnetic emission surface so as to protrude outside the permanent magnet. 2. The magnetic attraction member according to claim 1, wherein
The magnetic attraction member, wherein the yoke has a cylindrical shape including a ring-shaped hollow portion and at least one ring-shaped groove reaching the hollow portion and having a width smaller than that of the middle portion. 3. The magnetic attraction member according to claim 2, wherein
The magnetic attraction member, wherein the at least one groove is provided on at least one of an end surface and an outer peripheral surface of a cylindrical surface of the yoke. 4. The magnetic attraction member according to claim 2, wherein
The yoke has a ring-shaped cross section with a hole at the center. 5. The magnetic attraction member according to claim 4, wherein
The magnetic attraction member, wherein the at least one groove is provided on at least one of an end surface, an outer peripheral surface, and an inner peripheral surface of the cylindrical surface of the yoke. 6. The magnetic attraction member according to claim 2, wherein a ring-shaped permanent magnet is provided in the groove. 7. The magnetic attraction member according to claim 1, wherein
The yoke has a prismatic shape, and includes a hollow portion formed in a central axis direction of the prism and at least one groove extending in a direction along the central axis reaching at least one of the hollow portions. A magnetic attraction member, comprising: 8. The magnetic attraction member according to claim 7, wherein
The magnetic attraction member, wherein the hollow portions are arranged in at least two rows in a width direction or a thickness direction of the prism. 9. The magnetic attraction member according to claim 1, wherein
The yoke is a square plate, and at least one through hole,
A groove extending from a side surface of the square surface to a through hole, a permanent magnet is mounted in the groove, and a plurality of the yokes are arranged around a shaft so that the permanent magnet is directed in a central axis direction. A magnetic attraction member. 10. The magnetic attraction member according to claim 1, wherein the yoke has a disk shape or a ring shape and has a plurality of grooves on an outer peripheral surface or an inner peripheral surface. 11. A magnetic attraction comprising: the magnetic attraction member according to claim 1; and an attraction member made of a magnetic material, wherein the attraction member has a projection on a surface facing the projection. apparatus. 12. The magnetic attraction device according to claim 11, wherein the yoke has a cylindrical shape, and the cylinder has a ring-shaped hollow portion and at least one ring-shaped groove reaching the hollow portion. A magnetic attraction device, characterized in that: 13. The magnetic attraction device according to claim 11, wherein the at least one groove is provided on at least one of an end surface, an outer peripheral surface, and an inner peripheral surface of a cylindrical surface of the yoke. A magnetic attraction device, characterized in that: 14. The magnetic attraction device according to claim 13, wherein a groove is provided in a circumferential direction of an outer peripheral surface of the cylindrical surface, a permanent magnet is mounted in the groove, and the attracting member is provided on the outer peripheral surface. A magnetic attraction device, which extends in the axial direction and is arranged at a plurality of equal angular intervals in the circumferential direction. 15. The magnetic attraction device according to claim 14, wherein a plurality of pairs of protrusions are provided on both sides in a circumferential direction of the permanent magnet, and the plurality of pairs of protrusions are equiangularly spaced on the circumference. A magnetic attraction device characterized by being provided as follows. 16. The magnetic attraction device according to claim 15, wherein a plurality of pairs of projections corresponding to the respective permanent magnets are provided.
A magnetic attraction device, wherein the magnetic attraction device is slightly shifted in a circumferential direction as it moves in an axial direction. 17. The magnetic attraction device according to claim 13, wherein a groove is provided in a circumferential direction of an inner peripheral surface of the cylindrical surface, a permanent magnet is mounted in the groove, and the attracting member is provided in the inner surface. A magnetic attraction device, which extends in the axial direction on the inner side of the peripheral surface and is arranged at a plurality of equal angular intervals in the circumferential direction. 18. The magnetic attraction device according to claim 17, wherein a plurality of pairs of protrusions are provided on both sides in a circumferential direction of the permanent magnet, and the plurality of pairs of protrusions are equiangularly spaced on the circumference. A magnetic attraction device characterized by being provided as follows. 19. The magnetic attractive device according to claim 18, wherein a plurality of pairs of protrusions corresponding to the respective permanent magnets are provided.
A magnetic attraction device, wherein the magnetic attraction device is slightly shifted in a circumferential direction as it moves in an axial direction. 20. The magnetic attraction device according to claim 14, wherein the yoke has a ring-shaped cross section with a hole at the center. 21. The magnetic attraction device according to claim 14, wherein the yoke or the attraction member is formed so as to be rotatable about a central axis, and is rotated about one of the central axes. A magnetic attraction device being energized. 22. The magnetic attraction device according to claim 13, wherein a groove is provided at one end of the cylinder concentrically with an outer peripheral surface of the cylinder, and a permanent magnet is attached to the groove, and the permanent magnet is attached to the groove. A plurality of protrusions disposed at equal angular intervals so as to be sandwiched in a radial direction, wherein the suction member has a disk shape having one end so as to face the one end, and A magnetic attraction device, wherein a protrusion is provided on an end face so as to face the protrusion. 23. The magnetic attraction device according to claim 22, wherein the outer peripheral surface side and the central shaft side of the cylinder protrude in the axial direction to form a concave recessed in a ring shape, and the protruding end is formed at each of the protruding ends. The magnetic attraction device, wherein the protrusion is formed, and a ring-shaped protrusion corresponding to the recess is formed on the suction member. 24. The magnetic attraction device according to claim 11, wherein the yoke has a prismatic shape, and reaches at least one of a hollow portion formed in a central axis direction of the prism and the hollow portion. A magnetic attraction device comprising at least one groove extending in a direction along the central axis, wherein a permanent magnet is mounted in the groove. 25. The magnetic attraction device according to claim 24, wherein a pair of the protrusions that are long in the width direction are arranged so as to sandwich the permanent magnet, and a plurality of pairs of the protrusions are arranged in the axial direction of the prism. A plurality of the suction members are arranged at intervals and extend in the width direction, and are arranged at intervals in a direction along the central axis so as to correspond to the plurality of protrusions. Magnetic suction device. 26. The magnetic attraction device according to claim 25, wherein the hollow portions are arranged in at least two rows in a width direction or a thickness direction of the prism. 27. The magnetic attraction device according to claim 26, wherein the groove extends long in the length direction and is provided in plural in the width direction, and a pair of protrusions provided on both sides of the permanent magnet. Is a magnetic attraction device characterized in that the magnets are arranged at different axial positions between those provided on adjacent permanent magnets.