JP6258893B2 - Brake device - Google Patents

Description

  The present invention relates to a brake device.

  In a drive mechanism using torque such as a tipping machine, a brake device in which a braking force (braking force) works by magnetism may be used. As this type of brake device, for example, in Patent Document 1, a permanent magnet is provided on the facing surface of one rotating body, and a hysteresis material is provided on the facing surface of the other rotating body in two rotating bodies arranged to face each other. A brake device (hysteresis brake device) having a configuration is disclosed.

  Patent Document 2 discloses a brake device (eddy current) having a configuration in which a permanent magnet is provided on an opposing surface of one rotating body and a conductor is provided on an opposing surface of the other rotating body in two opposing rotating bodies. Brake device) is disclosed. Patent Document 2 also discloses the hysteresis brake device described above.

Japanese Patent No. 5271382 Japanese Patent Laid-Open No. 9-196216

  By the way, the hysteresis brake device disclosed in Patent Documents 1 and 2 generates a braking force when there is a speed difference (rotational speed difference) between the rotations of the rotating bodies (two members) arranged opposite to each other. The braking force of this hysteresis brake device is constant without change due to the difference in rotational speed between the rotating bodies. However, with a hysteresis brake device, when a large braking force is required, the braking force may be insufficient.

  On the other hand, in the eddy current brake device disclosed in Patent Document 2, when there is a speed difference in the rotation between the rotating bodies arranged opposite to each other, a braking force is generated by an eddy current generated in a conductor provided in the rotating body. Here, in the eddy current brake device, when the rotational speed difference is large, a large braking force can be obtained, but when the rotational speed difference is small, only a small braking force can be obtained and a necessary braking force cannot be obtained. It was.

  The present invention has been made in view of the above, and an element that generates a braking force that depends on a difference in rotational speed between two members and a substantially constant braking force that does not depend on the difference in rotational speed. It is an object of the present invention to provide a brake device that can maintain a predetermined braking force even with a low rotational speed difference by combining the elements.

  In order to solve the above-described problems and achieve the object, a brake device according to one aspect of the present invention has at least one main surface extending in a direction intersecting the axis, and rotates around the axis. A first rotating body, and a second rotating body that is disposed opposite to at least one main surface of the first rotating body and rotates around the axis, wherein the first rotating body has a conductor plate on the main surface. And the hysteresis plate or the magnet group, and the second rotating body is disposed on a surface facing the main surface of the first rotating body, and the conductive plate, the hysteresis plate, or the magnet group. Or the other is provided.

  In the brake device according to an aspect of the present invention, the conductive plate and the hysteresis plate are disposed to face the second rotating body, and the magnet group is disposed on the first rotating body. In addition, the magnet group having the first main surface and the second main surface and disposed on the first main surface is opposed to the conductor plate at a predetermined interval, and the second The first rotating body is arranged between the conductor plate and the hysteresis plate so that the magnet group arranged on the main surface of the magnet faces the hysteresis plate at a predetermined interval. It is characterized by being.

  Further, in the brake device according to one aspect of the present invention, the pair of the magnet groups are disposed to face the second rotating body with a predetermined interval, and the first rotating body includes the conductor plate. A first main surface disposed and a second main surface disposed with the hysteresis plate, the conductor plate facing the one magnet group at a predetermined interval; The first rotating body is disposed between the pair of magnet groups so that the hysteresis plate faces the other magnet group with a predetermined interval.

  Further, in the brake device according to one aspect of the present invention, the magnet group is disposed on a main surface of the first rotating body, and the second rotating body has the magnet on a surface facing the main surface. The conductive plate and the hysteresis plate disposed at a predetermined interval from the group are disposed.

  The brake device according to one aspect of the present invention is characterized in that a through hole is formed in a central portion of the conductor plate, and the hysteresis plate is disposed in the through hole.

  Further, in the brake device according to one aspect of the present invention, the first rotating body or the second rotating body provided with the conductive plate is made of a magnetic material, and the conductive plate is provided. A protrusion made of a magnetic material is formed on the surface of the first rotating body or the second rotating body, and a hole through which the protruding portion is inserted is formed in the conductor plate.

  In the brake device according to one aspect of the present invention, the number of the protrusions and the number of magnetic poles of the magnet group are different from each other.

  In the brake device according to one aspect of the present invention, the magnet group includes a permanent magnet or an electromagnet.

  According to the present invention, a combination of an element that generates a braking force that depends on the difference in rotational speed between the braking force of the two members and an element that generates an almost constant braking force that does not depend on the difference in rotational speed, A brake device capable of maintaining a predetermined braking force even with a speed difference can be provided.

FIG. 1 is a cross-sectional view schematically showing a brake device according to the first embodiment of the present invention. FIG. 2 is a schematic explanatory view of a magnet group used in the brake device according to the first embodiment of the present invention. FIG. 3 is a schematic explanatory view of a conductor plate (hysteresis plate) used in the brake device according to the first embodiment of the present invention. FIG. 4 is a schematic explanatory diagram of a modified example of the brake device according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a modified example of the brake device according to the first embodiment of the present invention. FIG. 6 is a side view showing an outline of a brake device according to the second embodiment of the present invention. FIG. 7 is a front view showing an outline of the first rotating body provided in the brake device according to the second embodiment of the present invention. FIG. 8 is a front view showing an outline of a second rotating body included in the brake device according to the second embodiment of the present invention. FIG. 9 is a side view showing an outline of a brake device according to Modification 1 of the second embodiment of the present invention. FIG. 10A is a front view showing an outline of a first rotating body included in a brake device according to Modification 1 of the second embodiment of the present invention. FIG. 10B is a schematic cross-sectional view for explaining the internal structure of the first rotating body shown in FIG. 9. FIG. 11: is a side view which shows the outline of the brake device which concerns on the modification 2 of 2nd Embodiment of this invention. FIG. 12: is a front view which shows the outline of the 1st rotary body with which the brake device which concerns on the modification 2 of 2nd Embodiment of this invention is provided.

  Hereinafter, embodiments of a brake device according to the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by the following embodiment. In the drawings, the same or corresponding elements are denoted by the same reference numerals as appropriate, and repeated descriptions are omitted as appropriate. Furthermore, it should be noted that the drawings are schematic, and dimensional relationships between elements may differ from actual ones. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included.

(First embodiment)
First, the brake device 1 according to the first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view schematically showing a brake device 1 according to the first embodiment of the present invention.
As shown in FIG. 1, the brake device 1 is attached to a rotating shaft 30 (rotor shaft). This brake device 1 is applied to, for example, a drive mechanism that uses torque of a tipping machine or the like. The brake device 1 includes a first rotating body 10 and a second rotating body 20 that rotate around the axis O of the rotating shaft 30.

The first rotating body 10 has at least one main surface extending in a direction intersecting the axis O. In the present embodiment, the first rotating body 10 is a disk having a first main surface 10a (upper surface in FIG. 1) and a second main surface 10b (lower surface in FIG. 1) extending in a direction orthogonal to the axis O. It is a shape. The first rotating body 10 has a through-hole through which the rotating shaft 30 is inserted in the center, and the rotating shaft 30 is inserted into the through-hole so that the first rotating body 10 also rotates integrally with the rotating shaft 30. It has become.
A magnet group 11 is provided on the first main surface 10 a and the second main surface 10 b of the first rotating body 10.

The second rotating body 20 is disposed to face at least one main surface of the first rotating body 10. In this embodiment, the 2nd rotary body 20 becomes a housing shape which has the disk-shaped upper surface part 20a and the bottom face part 20b, and the cylindrical side part 20c. A through hole is formed in the upper surface portion 20a and the bottom surface portion 20b of the second rotating body 20, and the rotating shaft 30 is inserted into the through hole. In addition, the first rotating body 10 inserted through the rotating shaft 30 is disposed in the second rotating body 20 in a non-contact state with the second rotating body 20.
In the present embodiment, the first rotating body 10 is composed of a magnetic body, and the second rotating body 20 is composed of a magnetic body and a non-magnetic body. As a desirable configuration of the second rotating body, the upper surface portion 20a is a magnetic material, and the bottom surface portion 20b and the side surface portion 20c are nonmagnetic materials.

  A conductor plate 21 and a hysteresis plate 22 are disposed on the inner surfaces of the upper surface portion 20a and the bottom surface portion 20b of the second rotating body 20, respectively. That is, the conductor plate 21 and the hysteresis plate 22 are disposed opposite to each other inside the second rotating body 20. The conductor plate 21 and the magnet group 11 are arranged in a non-contact state at a predetermined interval. Similarly, the hysteresis plate 22 and the magnet group 11 are arranged in a non-contact state at a predetermined interval.

  FIG. 2 is a schematic explanatory view (front view) of the magnet group 11 used in the brake device 1 according to the first embodiment of the present invention. The magnet group 11 includes a plurality of permanent magnets 11 a and 11 b in which N poles and S poles are alternately arranged at predetermined intervals around the axis of the rotary shaft 30 when viewed from the front. In FIG. 2, a total of 18 permanent magnets 11a and 11b are arranged at equal intervals. The magnet group 11 is bonded to the first rotating body 10 with an adhesive, for example.

FIG. 3 is a schematic explanatory diagram of the conductor plate 21 (hysteresis plate 22) used in the brake device 1 according to the first embodiment of the present invention.
The conductor plate 21 is, for example, a disk-shaped aluminum plate, and a through hole for inserting the rotation shaft 30 is formed in the center portion.
The hysteresis plate 22 is a disk-shaped plate made of, for example, an Fe—Cr—Co alloy (FCC material), and a through hole for inserting the rotating shaft 30 is formed at the center.
In the present embodiment, the distance between the conductor plate 21 and the magnet group 11 is appropriately set at a predetermined interval according to the required brake force. Similarly, the distance between the hysteresis plate 22 and the magnet group 11 is appropriately set at a predetermined interval according to the required brake force.

  In the brake device 1 according to the first embodiment configured as described above, when the first rotating body 10 and the second rotating body 20 rotate around the axis O, the first rotating body 10 and the second rotation. When there is a rotational speed difference with the body 20, the magnetic flux (alternating magnetic flux) of the magnet group 11 flows through the conductor plate 21 of the second rotating body 20. Then, when an eddy current flows in the conductor plate 21 so as to cancel out the magnetic flux, a braking force due to the eddy current is generated between the first rotating body 10 and the second rotating body 20. The eddy current braking force increases as the rotational speed difference increases.

  Further, when there is a rotational speed difference between the first rotating body 10 and the second rotating body 20, the magnetic flux (alternating magnetic flux) of the magnet group 11 flows to the hysteresis plate 22 and a braking force due to hysteresis loss is generated. The braking force due to the hysteresis loss becomes a substantially constant braking force regardless of the rotational speed difference.

  As described above, in the brake device 1, a predetermined braking force can be obtained even at a low rotational speed difference (low rotational speed difference) by using both the braking force due to the eddy current and the braking force due to the hysteresis loss. The braking force can be gradually increased as the rotational speed difference increases due to the eddy current braking force. In particular, by appropriately setting the ratio of the two braking forces, it is possible to adjust the characteristics of the braking force due to the required rotational speed difference of the braking device.

(Modification of the first embodiment)
Next, a modification of the first embodiment of the present invention will be described.
FIG. 4 is a schematic explanatory diagram of a modified example of the brake device according to the first embodiment of the present invention. This brake device differs from the configuration of the brake device 1 in the configurations of the conductor plate and the second rotating body (the upper surface portion of the second rotating body), and the other configurations are the same as the configuration of the brake device 1. Therefore, the configuration of the conductor plate 121 and the second rotating body 120 (the upper surface portion 120a of the second rotating body 120) will be described in detail. FIG. 4 is a schematic view of the conductive plate 121 disposed on the second rotating body 120 when viewed from the front.

  The conductor plate 121 has a disk shape, and the conductor plate 121 is formed with a plurality of holes 121a extending from the radially inner periphery side to the outer periphery side. In FIG. 4, 24 holes 121 a are formed in the conductor plate 121.

  On the inner surface side of the upper surface portion 120a of the second rotating body 120, a protruding portion 120aa that fits into the hole portion 121a of the conductor plate 121 is provided. The protrusions 120aa correspond to the number of holes 121a of the conductor plate 121, and in FIG. 4, 24 protrusions 120aa are provided. The conductor plate 121 is disposed on the inner surface side of the upper surface portion 120a so as to surround the protruding portion 120aa. Note that the protrusion 120aa is made of a magnetic material in the same manner as the upper surface 120a.

  In the brake device configured as described above, the magnetic flux path from the surface of the permanent magnet 11a (magnet group 11) toward the upper surface portion 120a of the second rotating body 120 is made of a magnetic material rather than the conductor plate 121. Since the protrusion part 120aa of the upper surface part 120a is larger, the path of the magnetic flux toward the protrusion part 120aa becomes dominant. Accordingly, a magnetic circuit is formed so as to return from the adjacent protrusion 120aa to the permanent magnet 11b via the inside of the upper surface 120a of the second rotating body 120, and the conductor is canceled out in accordance with the change in the magnetic flux density. Eddy current flows through the plate 121. That is, the protrusion 120aa functions as a tooth yoke, and magnetic flux is concentrated. This makes it possible to increase the eddy current and obtain a greater braking force.

  From various experimental results, it is known that the number of poles of the magnet group 11 and the number of the protrusions 120a can obtain a larger braking force when the number of the protrusions 120a is larger. Therefore, in the brake device, it is preferable that the number of protrusions 120 a is larger than the number of poles of the magnet group 11.

  In the first embodiment, the magnet group 11 is disposed on the first main surface 10a and the second main surface 10b of the first rotating body 10, and the conductor plate 21 and the hysteresis plate are provided on the second rotating body 20. Although the case where 22 is arrange | positioned was demonstrated, the arrangement | positioning with the magnet group 11, the conductor board 21, and the hysteresis board 22 may be reverse structure.

  For example, like the brake device 101 shown in FIG. 5, the conductor plate 21 is disposed on the first main surface 10 a of the first rotating body 10, and the hysteresis plate 22 is disposed on the second main surface 10 b of the first rotating body 10. Is disposed. Then, the pair of magnet groups 11 are arranged to face the second rotating body 20 so as to face the conductor plate 21 and the hysteresis plate 22 with a predetermined interval. The brake device 101 having such a configuration also has the same effect as the brake device 1.

(Second Embodiment)
Next, the brake device 201 according to the second embodiment of the present invention will be described. FIG. 6 is a side view showing an outline of the brake device 201 according to the second embodiment of the present invention.
As shown in FIG. 6, the brake device 201 includes a first rotating body 210 inserted through the first rotating shaft 230 and a second rotating body 220 inserted through the second rotating shaft 240.

  In the second embodiment, the first rotating body 210 has a disk shape having a main surface 210 a extending in a direction orthogonal to the axis O of the first rotating shaft 230. The first rotating body 210 has a through-hole through which the first rotating shaft 230 is inserted at the center, and the first rotating shaft 230 is inserted into the through-hole, and the first rotating body 230 is integrated with the first rotating shaft 230. 210 also rotates. The first rotating body 210 has a bearing portion 215. A magnet group 211 is provided on the main surface 210 a of the first rotating body 230.

The second rotator 220 has a disk shape extending in a direction orthogonal to the axis O, and is disposed opposite to the main surface 210 a of the first rotator 210. The second rotating body 220 is formed with a through hole through which the second rotating shaft 240 is inserted in the central portion. The second rotating shaft 240 is inserted through the through hole, and the second rotating shaft 240 is integrated with the second rotating shaft 240. The rotating body 220 is also rotated. The second rotating body 220 has a bearing portion 225.
Moreover, in 2nd Embodiment, the 1st rotary body 210 and the 2nd rotary body 220 are comprised with the magnetic body.

  A conductor plate 221 and a hysteresis plate 222 are disposed on the facing surface of the second rotating body 220 facing the main surface 210a (magnet group 211) of the first rotating body 210 (see FIG. 8). The conductor plate 221 and the magnet group 211 are arranged in a non-contact state at a predetermined interval. Similarly, the hysteresis plate 222 and the magnet group 211 are arranged in a non-contact state at a predetermined interval.

FIG. 7 is a front view of the first rotating body 210 provided in the brake device 201 according to the second embodiment of the present invention. FIG. 7 is a front view of the first rotating body 210 viewed from the side facing the second rotating body 220.
In the first embodiment, the two brake forces of the eddy current and the hysteresis loss are generated on different facing surfaces of the rotating body, respectively, but in the second embodiment, the above-described two brake forces are generated on one facing surface. By using the configuration generated in step 1, the configuration can be simplified. That is, in 2nd Embodiment, it is set as the structure which an eddy current brake force and a hysteresis brake force generate | occur | produce on the opposing surface of the inner peripheral side of the same surface of the 2nd rotary body 220, and an outer peripheral side.
In the second embodiment, the magnet group 211 includes a plurality of permanent magnets 211a and 211b in which N poles and S poles are alternately arranged at equal intervals around the axis O of the first rotating shaft 230 when viewed from the front. . In FIG. 7, a total of 24 permanent magnets 211a and 211b are arranged. The magnet group 211 is bonded to the first rotating body 210 with an adhesive, for example.

  FIG. 8 is a front view showing an outline of the second rotating body 220 provided in the brake device 201 according to the second embodiment of the present invention. FIG. 8 is a front view of the second rotating body 220 as viewed from the side facing the first rotating body 210, and shows a state in which the conductor plate 221 and the hysteresis plate 222 are disposed on the second rotating body 220. Show.

  The hysteresis plate 222 is a disc-shaped plate made of, for example, an Fe—Cr—Co alloy (FCC material), and a through hole for inserting the second rotating shaft 240 is formed at the center. The conductor plate 221 is, for example, a disk-shaped aluminum plate, and a through hole for arranging the hysteresis plate 222 is formed at the center.

In the second embodiment, the conductor plate 221 and the hysteresis plate 222 are arranged on the same plane, and the hysteresis plate 222 is arranged in the through hole inside the conductor plate 221.
In the second embodiment, the distance between the conductor plate 221 and the magnet group 211 is appropriately set at a predetermined interval according to the magnitude of the required braking force. Similarly, the distance between the hysteresis plate 222 and the magnet group 211 is also appropriately set at a predetermined interval according to the magnitude of the required braking force.

  In the brake device 201 according to the second embodiment of the present invention configured as described above, when the first rotating body 210 and the second rotating body 220 rotate around the axis O, the first rotating body 210 and When there is a rotational speed difference with the second rotating body 220, the magnetic flux (alternating magnetic flux) of the magnet group 211 flows through the conductor plate 221. Then, when an eddy current flows in the conductor plate 221 so as to cancel out the magnetic flux, a braking force due to the eddy current is generated between the first rotating body 210 and the second rotating body 220. Further, when there is a rotational speed difference between the first rotating body 210 and the second rotating body 220, the magnetic flux (alternating magnetic flux) of the magnet group 211 flows through the hysteresis plate 222, and a braking force due to hysteresis loss is generated.

  As described above, in the brake device 201 as well, like the brake device 1, a predetermined brake force can be obtained even at a low rotational speed difference by using two brake forces of an eddy current and a brake force due to hysteresis loss. And the braking force can be gradually increased as the rotational speed difference increases due to the eddy current braking force.

  Further, in the brake device 201 according to the second embodiment, the magnet group 211 is disposed on one main surface 210a of the first rotating body 210, and on one surface of the second rotating body 220 facing the main surface 210a. Since the conductor plate 221 and the hysteresis plate 222 are disposed, the size can be further reduced as compared with the brake device 1.

(Modification 1 of 2nd Embodiment)
Next, a brake device 301 according to Modification 1 of the second embodiment will be described. Since the brake device 301 has the same configuration as the brake device 201 according to the second embodiment described above except for the configuration of the first rotating body, the components having the same configuration are denoted by the same reference numerals and described. Detailed description is omitted.

  FIG. 9 is a side view showing an outline of a brake device 301 according to Modification 1 of the second embodiment of the present invention. FIG. 10A is a front view illustrating an outline of a first rotating body 310 provided in the brake device 301 according to the first modification of the second embodiment of the present invention. FIG. 10A is a front view of the first rotating body 310 viewed from the side facing the second rotating body 220. FIG. 10B is a schematic cross-sectional view for explaining the internal structure of the first rotating body shown in FIG. 9.

The brake device 301 includes a first rotating body 310 through which the first rotating shaft 230 is inserted, and a second rotating body 220 through which the second rotating shaft 240 is inserted.
The first rotator 310 has a housing shape, and is provided with comb-like yoke plates 311 arranged at equal intervals around the axis O on the side facing the second rotator 220. A ring-shaped coil 312 is arranged on the inner surface side (right surface side in FIG. 10B) of the yoke plate 311. The coil 311 is fixed to, for example, a circuit board (not shown) provided inside the first rotating body 310. In addition, a through hole is formed in the central portion of the first rotating body 310 and a bearing portion 315 is provided, and the first rotating shaft 230 is inserted through the through hole and the bearing portion 315.

  By passing a current through the coil 312, the outer and inner sides of the comb-shaped yoke plate 311 are excited to the N pole and the S pole, respectively. That is, the yoke plate 311 and the coil 312 function as an electromagnet to form a magnet group. By arranging the conductor plate 221 and the hysteresis plate 222 of the second rotating body 220 so as to face the yoke plate 311 excited to the N pole and the S pole in this way, a hysteresis brake and an eddy current brake are generated. Therefore, the brake device 301 also has the same effect as the brake device 201 described above. Further, this braking force can be controlled by the value of current flowing through the coil 312 (excitation coil).

(Modification 2 of the second embodiment)
Next, a brake device 401 according to Modification 2 of the second embodiment will be described. Since the brake device 401 has the same configuration as the brake device 201 according to the second embodiment described above except for the configuration of the first rotating body, the components having the same configuration are denoted by the same reference numerals and described. Detailed description is omitted.

  FIG. 11 is a side view showing an outline of a brake device 401 according to Modification 2 of the second embodiment of the present invention. FIG. 12 is a front view of the outline of the first rotating body 410 provided in the brake device 401 according to the second modification of the second embodiment of the present invention, as viewed from the side facing the second rotating body 220.

The brake device 401 includes a first rotating body 410 through which the first rotating shaft 230 is inserted, and a second rotating body 220 through which the second rotating shaft 240 is inserted.
The first rotating body 410 has a disk shape extending in a direction orthogonal to the axis O, and is disposed to face the surface of the second rotating body 220. The first rotating body 410 is formed with a through-hole through which the first rotating shaft 230 is inserted in the central portion. The first rotating shaft 230 is inserted through the through-hole, and the first rotating shaft 230 is integrated with the first rotating shaft 230. The rotating body 410 also rotates. The first rotating body 410 has a bearing portion 415.

  A circuit board 412 is disposed on the main surface of the first rotating body 410 facing the conductor plate 221 and the hysteresis plate 222 of the second rotating body 220. Further, a plurality of coils 411 are arranged on the circuit board 412 at equal intervals around the axis O of the first rotation shaft 230.

A direct current voltage is applied to each coil 411, and a magnetic field formed by each coil 411 depending on the polarity of the applied voltage is such that N and S poles appear alternately around the axis O when viewed from the front. ing. That is, this coil 411 (electromagnetic coil) becomes an electromagnet and forms a magnet group. In FIG. 12, no magnetic material is provided at the center of each coil 411, but an appropriate magnetic material may be provided as required.
The brake device 401 configured as described above also has the same effect as the brake device 201 described above.

Note that the present invention is not limited to the above embodiment. What was comprised combining each component mentioned above suitably is also contained in this invention. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, in the above embodiment, the case where the first rotating body and the second rotating body rotate has been described, but one rotating body may be fixed.

O Axis 1, 101, 201, 301, 401 Brake device 10, 210, 310, 410 First rotating body 10a First main surface 10b Second main surface 11, 211 Magnet group 11a, 11b Permanent magnets 20, 120, 220 2nd rotating body 20a, 120a Top surface portion 20b Bottom surface portion 20c Side surface portions 21, 121, 221 Conductor plates 22, 222 Hysteresis plate 30 Rotating shaft 120aa Projection portion 121a Hole portion 210a Main surfaces 215, 225, 315, 415 Bearing portion 230 First rotating shaft 240 Second rotating shaft 310a Convex portion 311 Yoke plate 312, 411 Coil 412 Circuit board

Claims (5)

A first rotating body having a disk shape having two main surfaces extending in a direction orthogonal to the axis, and rotating around the axis;
It has two two opposing surfaces that will be opposed to each main surface of the first rotary member, and a second rotating body that rotates about said axis,
The first rotating body, each of said two major surfaces, magnets group is provided across the first rotating body,
It said second rotary member, said one of the two opposing surfaces, wherein in one face the two magnet group conductors plate is provided at a predetermined interval, to the other of said two opposite faces, A hysteresis plate is provided opposite to the other of the two magnet groups at a predetermined interval, and the conductor plate and the hysteresis plate are arranged to face each other so as to sandwich the first rotating body. And brake device. A first rotating body having a disk shape having two main surfaces extending in a direction orthogonal to the axis, and rotating around the axis;
A second rotating body having two opposing surfaces arranged to face each of the two main surfaces of the first rotating body and rotating around the axis,
The second rotating body is provided with a magnet group on each of the two opposing surfaces,
In the first rotating body, a conductor plate is provided on one of the two main surfaces with a predetermined interval facing one of the two magnet groups, and on the other of the two main surfaces, the 2 A hysteresis plate is provided opposite to the other of the two magnet groups with a predetermined interval and sandwiching the first rotating body with respect to the conductor plate, and the two magnet groups include the first rotating body. features and be Lube rake device that are oppositely arranged so as to sandwich. The first rotating body or the second rotating body on which the conductor plate is disposed is made of a magnetic body,
Protrusions made of a magnetic material are formed on the surface of the first rotating body or the second rotating body where the conductor plate is disposed,
The brake apparatus according to claim 1 or claim 2, characterized in that holes for the protruding portion is inserted is formed in the conductor plate. The brake device according to claim 3 , wherein the number of the protrusions and the number of magnetic poles of the magnet group are different from each other. The brake device according to any one of claims 1 to 4 , wherein the magnet group includes a permanent magnet or an electromagnet.

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