JP6442887B2 - Magnetic gear device - Google Patents

Description

  The present invention is arranged between a first magnet row and a second magnet row, a first magnet row and a second magnet row in which a plurality of magnetic pole pairs are respectively arranged at substantially equal intervals along a specific direction, The present invention relates to a magnetic gear device including a magnetic body row in which a plurality of magnetic bodies are arranged at substantially equal intervals along a specific direction.

  Non-Patent Document 1 discloses a magnetic gear device. The magnetic gear device includes a cylindrical first magnet row and a second magnet row each having a plurality of magnetic pole pairs arranged at substantially equal intervals along the circumferential direction, and between the first magnet row and the second magnet row. And a cylindrical magnetic body row in which a plurality of magnetic bodies are respectively arranged at substantially equal intervals along the circumferential direction.

Non-Patent Document 1 discloses a technique for reducing eddy current loss by laminating magnets constituting magnetic pole pairs in the circumferential direction.
Patent Document 1 discloses a technique in which a magnet constituting a magnetic pole pair is a bonded magnet in order to reduce eddy current loss in a magnetic gear device.

JP2013-17285A

Tetsuya Ikeda, Kenji Nakamura, Osamu Ichinokura, “A Study on Efficiency Improvement of Permanent Magnet Type Magnetic Gear”, Journal of the Magnetic Society, 2009, Vol. 33, No. 2, pp. 130-134

  In a magnetic gear device, stacking magnets in multiple layers in the circumferential direction increases the cost, and the magnets to be stacked are Nd-Fe-B sintered magnets, so that the electrical resistance is low and eddy current is reduced to reduce the thickness of the magnets. It is necessary to reduce the thickness.

  The technique of Patent Document 1 uses a bond magnet (resin-bonded magnet), which has a large electric resistance and can reduce eddy currents. However, the bond magnet has lower magnetic properties than a sintered magnet and is the same as a sintered magnet. In order to make a magnetic gear device having the capability, it is necessary to enlarge the magnetic gear device.

  The present invention has been made in view of such a situation. The object is to provide a magnetic gear device with low eddy current loss and reduced size.

  The magnetic gear device according to the present invention is opposed to the first magnet row in which a plurality of magnetic pole pairs are arranged at substantially equal intervals along a specific direction, and the first magnet row. A second magnet row in which a plurality of magnetic pole pairs are arranged at substantially equal intervals at a shorter pitch (or longer pitch) than the first magnet row and the second magnet row, and at substantially equal intervals. A magnetic gear device including a plurality of magnetic bodies arranged on the magnetic gear device, wherein the second magnet row (or the first magnet row) includes a first layer made of a rare earth sintered magnet and a rare earth bonded magnet. It has a laminated body which consists of a 2nd layer, The said 2nd layer is distribute | arranged to the side facing the said magnetic body row | line | column.

  In the present invention, the magnet array on the short pitch side is a laminate having a two-layer structure, a rare earth bond magnet is disposed on the surface facing the magnetic body array, and a rare earth sintered magnet is disposed below the rare earth bond magnet. By doing so, high magnetic characteristics and low eddy current loss can be realized.

  In the magnetic gear device according to the present invention, the first magnet row (or the second magnet row) includes a laminate including a first layer made of a rare earth sintered magnet and a second layer made of a rare earth bonded magnet, The second layer is arranged on the side facing the magnetic body row.

  In the present invention, since the magnet array on the long pitch side in addition to the magnet array on the short pitch side is a laminate having a two-layer structure, high magnetic characteristics and low eddy current loss can be realized.

  The magnetic gear device according to the present invention is characterized in that the first magnet row (or the second magnet row) is made of a rare earth sintered magnet.

  In the present invention, since a laminate of rare earth bonded magnets and rare earth sintered magnets is used only for the magnet array on the short pitch side, and only rare earth sintered magnets are used for the magnet array on the long pitch side, eddy current loss is reduced. A highly efficient magnetic gear device can be realized while suppressing.

  In the magnetic gear device according to the present invention, the rare earth sintered magnet is an anisotropic R-Fe-B based sintered magnet, and the rare earth bonded magnet is an isotropic R-Fe-B based bonded magnet. Features.

In the present invention, since the rare earth sintered magnet is an anisotropic R—Fe—B based sintered magnet (R is a rare earth element), a magnetic gear device having high magnetic characteristics and high efficiency can be realized. Since the bond magnet is an isotropic R—Fe—B based bond magnet, the electrical resistivity is high and the generation of eddy currents can be suppressed.
Further, since the R—Fe—B rare earth bonded magnet is isotropic, it can be magnetized in accordance with the orientation direction of the anisotropic R—Fe—B sintered magnet. Even in the case of a laminated structure with a magnet, unlike an anisotropic magnet, it is possible to reduce a decrease in efficiency due to a shift in the orientation direction.

  The magnetic gear device according to the present invention is characterized in that the rare earth bonded magnet is an isotropic R—Fe—B based bonded magnet having a residual magnetic flux density exceeding 0.7 T.

  In the present invention, since the residual magnetic flux density of the rare earth bonded magnet is more than 0.7T, it is possible to suppress a decrease in efficiency due to the use of the bonded magnet.

  The magnetic gear device according to the present invention is characterized in that the thickness of the second layer in the stacking direction is between 5% and 50% of the thickness of the first layer in the stacking direction.

  In the present invention, the thickness in the stacking direction of the second layer (rare earth bonded magnet) of the laminate is set to 5 to 50% of the thickness of the first layer (rare earth sintered magnet). The loss of eddy current can be reduced while suppressing the efficiency drop.

  In the magnetic gear device according to the present invention, each of the first magnet row, the second magnet row, and the magnetic body row has a coaxially arranged cylindrical shape, and the specific direction is the first magnet row. The second magnet row and the magnetic body row are circumferential directions, and the first magnet row and the second magnet row are magnetized in a radial direction of a cylinder.

  In the present invention, it is possible to constitute a cylindrical magnetic gear device.

  In the magnetic gear device according to the present invention, each of the first magnet row, the second magnet row, and the magnetic body row has a disk shape arranged coaxially, and the specific direction is the first magnet row. It is the circumferential direction of a row | line | column, the said 2nd magnet row | line | column, and the said magnetic body row | line | column, and the said 1st magnet row | line | column and the said 2nd magnet row | line | column are magnetized in the thickness direction of a disc.

  In the present invention, it is possible to constitute a disk-shaped magnetic gear device.

  In the magnetic gear device according to the present invention, each of the first magnet row, the second magnet row, and the magnetic body row has a rectangular plate shape, and the specific direction is the first magnet row and the second magnet. The first magnet row and the second magnet row are magnetized in the thickness direction of the rectangular plate in the longitudinal direction of the row and the magnetic body row.

  In the present invention, it is possible to constitute a long plate-like linear magnetic gear device.

  In the magnetic gear device according to the present invention, each of the first magnet row, the second magnet row, and the magnetic body row has a coaxially arranged cylindrical shape, and the specific direction is the first magnet row. The first magnet row and the second magnet row are magnetized in a radial direction of a cylinder in a direction along a central axis of the second magnet row and the magnetic body row.

  In the present invention, a cylindrical linear magnetic gear device can be configured.

  The magnetic gear device according to the present invention has a cylindrical shape, a first magnet row in which a plurality of magnetic pole pairs are equally arranged along the circumferential direction, and a cylindrical shape, so as to face the first magnet row. A second magnet array that is coaxially disposed outside the first magnet array, and in which a plurality of magnetic pole pairs are equally disposed along the circumferential direction at a shorter pitch than the first magnet array, and a cylinder A magnetic gear device comprising: a magnetic body row having a shape and being arranged between the first magnet row and the second magnet row, wherein a plurality of magnetic bodies are equally arranged along the circumferential direction. The distance in the facing direction between the body row and the second magnet row is shorter than the distance in the facing direction between the magnetic row and the first magnet row, and the magnetic body is closer to the first magnet row side. Is expanded in the circumferential direction as compared to the second magnet array side, and the second magnet array is anisotropic R-Fe-B-based sintered. The second layer consists of a second layer comprising a first layer and the isotropic R-Fe-B based bonded magnet made of stone, characterized in that arranged on the side opposite to the magnetic column.

In the present invention, when the first magnet row rotates at a high speed and the second magnet row rotates at a low speed, the plurality of magnetic bodies are on the second magnet row side on the low speed side compared to the first magnet row on the high speed side. It is arranged closer. As will be described later, the plurality of magnetic bodies are disposed between the first magnet row and the second magnet row, as compared with the case where the plurality of magnetic bodies are arranged in the substantially central portion of the gap between the first magnet row and the second magnet row. The torque to be transmitted is large.
When the distance between the first magnet array and the second magnet array in the facing direction is the same and the thickness of the magnetic body is the same, that is, when the distance and the thickness are fixed to a constant design value, a plurality of The magnetic body should be closer to the low speed side.
Moreover, the magnetic body is spreading in the circumferential direction on the first magnet row side compared to the second magnet row side. For example, the magnetic body has a longer circumferential width on the first magnet row side than a circumferential width on the second magnet row side. In a magnetic body row that is cylindrical as a whole, even if a centrifugal force that rotates the magnetic body row and moves each magnetic body radially outward acts on each magnetic body, a force that resists the centrifugal force Work. In addition, since the magnetic material example is arranged closer to the second magnet array side, the attractive force in the radially outward direction acts on the magnetic material, but the magnetic material acts against the attractive force.
Accordingly, it is not necessary to provide a holding layer such as a cover on the outer peripheral side of the magnetic body row in order to prevent the magnetic body from being pulled radially outward by a centrifugal force or an attractive force. Since it is not necessary to provide the holding layer, the radial distance between the plurality of magnetic bodies and the second magnet row on the low speed side can be further shortened. Therefore, it is possible to increase the torque transmitted between the first magnet row and the second magnet row.
Furthermore, the generation of eddy current increases as the magnetic body row approaches the second magnet row on the short pitch side, and the second magnet row on the short pitch side is anisotropically sintered. The laminate is composed of a first layer made of a magnet and a second layer made of an isotropic R—Fe—B based bonded magnet. And the 2nd layer is distribute | arranged to the side facing a magnetic body row | line | column. Thereby, the transmission torque can be improved and the generation of eddy current can be suppressed.

  In the magnetic gear device according to the present invention, the first magnet row includes a first layer made of an anisotropic R—Fe—B based sintered magnet and a second layer made of an isotropic R—Fe—B based bonded magnet. The second layer is arranged on the side facing the magnetic row.

  In the present invention, in addition to the second magnet row on the short pitch side, the first magnet row on the long pitch side is also a laminated body having a two-layer structure, so that high magnetic characteristics and low eddy current loss can be realized.

  In the magnetic gear device according to the present invention, the first magnet row is composed of an anisotropic R—Fe—B based sintered magnet.

  In the present invention, since the rare earth bonded magnet and rare earth sintered magnet laminate is used only for the second magnet row on the short pitch side, and only the rare earth sintered magnet is used for the first magnet row on the long pitch side, A highly efficient magnetic gear device can be realized while suppressing eddy current loss.

  In the present invention, high magnetic characteristics and low eddy current loss can be realized.

FIG. 3 is a side sectional view showing a configuration example of the magnetic gear device according to the first embodiment. It is explanatory drawing which shows two structural examples of a laminated body. FIG. 6 is a side cross-sectional view illustrating a configuration example of a magnetic gear device according to a second embodiment. FIG. 10 is a side cross-sectional view showing a configuration example of a magnetic gear device according to a third embodiment. FIG. 10 is a side cross-sectional view illustrating a configuration example of a magnetic gear device according to a fourth embodiment. FIG. 10 is an exploded perspective view illustrating a configuration example of a magnetic gear device according to a fifth embodiment. FIG. 10 is a side cross-sectional view illustrating a configuration example of a magnetic gear device according to a fifth embodiment. FIG. 10 is an exploded perspective view showing a configuration example of a magnetic gear device according to a sixth embodiment. FIG. 10 is a side sectional view showing a configuration example of a magnetic gear device according to a sixth embodiment. FIG. 16 is an exploded perspective view showing a configuration example of a magnetic gear device according to a seventh embodiment. FIG. 10 is a side cross-sectional view illustrating a configuration example of a magnetic gear device according to a seventh embodiment. FIG. 20 is a side cross-sectional view showing a configuration example of a magnetic gear device according to an eighth embodiment. FIG. 20 is a side cross-sectional view illustrating a configuration example of a magnetic gear device according to a ninth embodiment.

  Hereinafter, embodiments will be specifically described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a side sectional view showing a configuration example of the magnetic gear device according to the first embodiment. The magnetic gear device according to Embodiment 1 of the present invention is a rotating cylindrical type. The magnetic gear device includes a cylindrical first magnet row 1, a cylindrical second magnet row 3 arranged coaxially with a gap outside the first magnet row, a first magnet row 1 and a first magnet row. And a cylindrical magnetic body row 2 arranged coaxially with a gap between the two magnet rows 3.

The first magnet row 1 has an inner cylindrical portion 11 made of a magnetic material. On the outer peripheral surface of the inner cylindrical portion 11, an outer peripheral surface side N-pole magnet 12a magnetized in the thickness direction and an outer peripheral surface side S. Three pairs of magnetic pole pairs 12 composed of polar magnets 12b are arranged at substantially equal intervals along the circumferential direction.
Here, “substantially equal intervals” means equal intervals in terms of design. In order to include tolerances associated with processing and assembly required in the process of manufacturing a structure, abbreviations are added before equal intervals. This also applies to the following description.

  The magnet 12a and the magnet 12b are anisotropic R—Fe—B based sintered magnets. An anisotropic R-Fe-B based sintered magnet is a magnet made by powder metallurgy.

  The second magnet row 3 has an outer cylindrical portion 31 made of a magnetic material. On the inner peripheral surface of the outer cylindrical portion 31, a magnetic pole pair 32 composed of an inner peripheral surface side N-pole magnet 32a and an inner peripheral surface side S-pole magnet 32b magnetized in the thickness direction (cylinder radial direction) is circular. Seven sets are arranged at substantially equal intervals along the circumferential direction. The magnet 32a and the magnet 32b which comprise the magnetic pole pair 32 are laminated bodies. The magnet 32a (32b) includes an anisotropic R-Fe-B based sintered magnet 32a1 (32b1) positioned on the inner peripheral side of the outer cylindrical portion 31 and an isotropic R-Fe-B positioned on the inner peripheral side thereof. It is a laminated body containing the system bond magnet 32a2 (32b2). Since the magnet 32a (32b) is magnetized in the thickness direction as a whole as described above, the magnet 32a1 (32b1) and the magnet 32a2 (32b2) constituting the laminate are also magnetized in the thickness direction. Here, the laminated body magnetized in the thickness direction means that the outer peripheral surface side and the inner peripheral surface side are magnetized so as to have different polarities.

  The magnet 32a1 (32b1) constituting the laminated body is an anisotropic R—Fe—B based sintered magnet. An anisotropic R-Fe-B based sintered magnet is a magnet made by powder metallurgy.

  The magnet 32a2 (32b2) constituting the laminate is an isotropic R—Fe—B bond magnet. The isotropic R—Fe—B based bonded magnet is formed by mixing fine magnet particles or fine powder with a binder such as a resin and then molding by a method such as injection molding or compression molding. The magnet 32a (32b2) is manufactured by a known technique, for example, a method described in International Publication WO2012 / 118001.

  The magnetic body row 2 includes a cylindrical partition wall 21 and a plurality of magnetic bodies 22 held by the partition wall. The magnetic bodies 22 are arranged at substantially equal intervals along the circumferential direction. The magnetic body row 2 has ten magnetic bodies 22 equal to the sum of the number 3 of pairs of magnetic pole pairs 12 included in the first magnet row 1 and the number of pairs 7 of magnetic pole pairs 32 included in the second magnet row 3.

  The magnetic body row 2 is produced, for example, by fixing each magnetic body to a resin formed in a cylindrical shape (see, for example, International Publication WO2009 / 087408). An alternating magnetic field including a third harmonic component, a seventh harmonic component, and a thirteenth harmonic component generated by the magnetic pole pair 12 of the first magnet row and the magnetic pole pair 32 of the second magnet row 3 has a diameter in the magnetic body row 2. Cross along the direction. For the magnetic body 22, for example, a magnetic metal, a laminated steel plate made of a plurality of laminated magnetic plates, and a soft magnetic body made of a compact of magnetic powder may be used. In order to suppress eddy current loss, the magnetic material is preferably a laminated steel plate.

  In the magnetic gear device, a first magnet row 1, a second magnet row 3 and a magnetic body row 2 each having a cylindrical shape are arranged coaxially. The magnetic body row 2 is located at a position separating the first magnet row 1 and the second magnet row 3. In the magnetic gear device, when the second magnet row 3 rotates, the first magnet row 1 rotates due to the magnetic interaction between the magnetic pole pairs of the first magnet row 1 and the second magnet row 3. In this case, the first magnet row 1 having a smaller number of magnetic poles than the second magnet row 3 rotates in a direction opposite to the rotation direction of the second magnet row 3 at a higher rotation speed than the second magnet row 3 (see Non-Patent Document 1). reference). The ratio Ph / Pl between the number Ph of the magnetic pole pairs 12 arranged in the first magnet row 1 and the number Pl of the magnetic pole pairs 32 arranged in the second magnet row 3 is equal to the second magnet row 3. The gear ratio of one magnet row 1 is obtained. When the second magnet row 3 rotates once counterclockwise, the first magnet row 1 rotates 7/3 clockwise.

  Next, eddy current loss will be described. As described above, the magnet pair 32 of the second magnet row 3 forms a laminated body. The magnet 32a1 (32b1) constituting one layer of the laminate is an anisotropic R—Fe—B based sintered magnet. Anisotropic R-Fe-B sintered magnets are magnets made by powder metallurgy and have high magnetic properties, but because they are metals, they have low electrical resistivity (about 1.5 μΩ · m) due to eddy currents. The loss is great. The magnet 32a2 (32b2) constituting the other layer of the laminate is an isotropic R—Fe—B based bonded magnet. An isotropic R-Fe-B bond magnet is formed by mixing fine magnet particles or fine powders with a binder such as a resin and molding it by a method such as injection molding or compression molding. Although the magnetic properties are lower than that of the magnetized magnet, the electrical resistivity is high (16 μΩ · m or more), and the loss due to eddy current is small.

  The eddy current has a characteristic that it is generated near the surface of the magnet due to the skin effect and attenuates toward the inside of the magnet. An isotropic R—Fe—B based bonded magnet 32a2 (32b2) having a high electrical resistivity is disposed on the surface side of the magnet 32a (32b). An anisotropic R-Fe-B based sintered magnet 32a1 (32b1) having high magnetic properties is disposed on the lower layer side of the magnet 32a (32b). Thereby, as the whole magnet 32a (32b), it can be set as a laminated body with high magnetic characteristics and suppressing eddy current loss.

In the laminate, it is desirable that the ratio of the thickness of the isotropic R—Fe—B bond magnet to the thickness of the entire laminate is 5% or more and 50% or less.
If the thickness of the isotropic R—Fe—B bond magnet is less than 5%, generation of eddy current cannot be sufficiently suppressed. On the other hand, if it exceeds 50%, the ratio of the anisotropic R—Fe—B based sintered magnet is reduced, so that the magnetic characteristics are deteriorated and sufficient transmission torque cannot be obtained.

  In addition, since eddy currents are frequently generated in the second magnet array 3, a laminated body of anisotropic sintered magnets and isotropic bonded magnets is disposed only in the second magnet array 3. The reason why eddy currents are frequently generated on the second magnet row 3 side is considered to be more influenced by the magnetic field of the magnets on the first magnet row 1 side because the magnets on the second magnet row 3 side are small.

  Next, the advantage of using an isotropic R—Fe—B based bonded magnet will be described. FIG. 2 is an explanatory diagram showing two configuration examples of the laminate. FIG. 2A shows a case where the laminate is composed of an isotropic magnet and an anisotropic magnet. FIG. 2B shows a case where the laminate is composed of an anisotropic magnet and an anisotropic magnet.

  In the anisotropic magnet, the direction of magnetic powder (magnet particles) that becomes a magnet follows the direction of the magnetic field when the magnet is formed. Therefore, depending on the molding conditions at the time of magnet molding, the orientation of the magnets may be shifted in each of the laminates as shown in FIG. 2B during molding. However, the orientation cannot be corrected by the subsequent magnetization process. If the orientation of the magnets is shifted as shown in FIG. 2B, the orientations of the respective magnets are not aligned (for example, the orientation direction of the inner anisotropic magnet in FIG. 2B is thick). Deviating from the vertical direction), the characteristics of the magnet cannot be fully utilized.

On the other hand, in the configuration of FIG. 2A adopted in the first embodiment, the bonded magnet is isotropic, so the direction of magnetization of the anisotropic sintered magnet depends on the magnetization condition (magnetization yoke condition). The direction of magnetization of the isotropic bonded magnet can be aligned. Therefore, it becomes easy to effectively use the characteristics of the magnet.
Further, an isotropic bonded magnet having a residual magnetic flux density of 0.7T to 0.9T (700 to 900 mT) equivalent to an anisotropic bonded magnet (for example, HIDENSE (registered trademark) -500 manufactured by NEOMAX Engineering Co., Ltd.) Magnetic flux density 830-900 (mT), intrinsic coercive force 450-550 (kA / m), maximum energy product 97-107 (kJ / m3)), eddy current loss due to high magnetic properties and large electrical resistivity Can be reduced.

  Embodiment 1 has the following effects. Lamination of the second magnet array 3, which generates a lot of eddy currents, with an isotropic R—Fe—B based bonded magnet having a high electrical resistivity and an anisotropic R—Fe—B based sintered magnet having a high magnetic property By using the body, it is possible to reduce eddy current loss and prevent deterioration of magnetic characteristics. Since the bonded magnet is isotropic and the sintered magnet is anisotropic, the direction of magnetization of the bonded magnet can be easily aligned with the direction of magnetization of the sintered magnet. It can be used effectively.

(Embodiment 2)
FIG. 3 is a side cross-sectional view showing a configuration example of the magnetic gear device according to the second embodiment. The magnetic gear device according to Embodiment 2 is configured such that the first magnet row 1 rotates at a low speed and the second magnet row 3 rotates at a high speed. Accordingly, the first magnet row 1 is a laminate, and the second magnet row 3 is a single layer. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The first magnet row 1 has an inner cylindrical portion 11 made of a magnetic material. On the outer peripheral surface of the inner cylindrical portion 11, an outer peripheral surface side N-pole magnet 12a magnetized in the thickness direction and an outer peripheral surface side S. Seven pairs of magnetic pole pairs 12 composed of polar magnets 12b are arranged at substantially equal intervals along the circumferential direction. The magnet 12a and the magnet 12b constituting the magnetic pole pair 12 are laminated bodies. The magnet 12a (12b) includes an anisotropic R-Fe-B based sintered magnet 12a1 (12b1) located on the outer peripheral side of the inner cylindrical portion 11 and an isotropic R-Fe-B based bond located on the outer peripheral side thereof. It is a laminated body including the magnet 12a2 (12b2). Since the magnet 12a (12b) is magnetized in the thickness direction as a whole as described above, the magnet 12a1 (12b1) and the magnet 12a2 (12b2) constituting the laminate are also magnetized in the thickness direction.

  As in the first embodiment, the magnet 12a1 (12b1) constituting the laminate is an anisotropic R—Fe—B based sintered magnet. The magnet 12a2 (12b2) constituting the laminate is an isotropic R—Fe—B bond magnet.

  The second magnet array 3 has an outer cylindrical portion 31 made of a magnetic material, and an inner peripheral surface side N-pole magnet 32a magnetized in the thickness direction and an inner peripheral surface on the inner peripheral surface of the outer cylindrical portion 31. Three pairs of magnetic pole pairs 32 composed of surface-side S-pole magnets 32b are arranged at substantially equal intervals along the circumferential direction. The magnet 32a and the magnet 32b are anisotropic R—Fe—B based sintered magnets.

  The magnetic body row 2 includes a cylindrical partition wall 21 and a plurality of magnetic bodies 22 held by the partition wall. The magnetic bodies 22 are arranged at substantially equal intervals along the circumferential direction. The magnetic body row 2 has ten magnetic bodies 22 equal to the sum of the number of pairs 7 of the magnetic pole pairs 12 included in the first magnet row 1 and the number of pairs 3 of the magnetic pole pairs 32 included in the second magnet row 3. Other configurations of the magnetic body row 2 are the same as those in the first embodiment.

  In the magnetic gear device, a first magnet row 1, a second magnet row 3 and a magnetic body row 2 each having a cylindrical shape are arranged coaxially. The magnetic body row 2 is located at a position separating the first magnet row 1 and the second magnet row 3. In the magnetic gear device, when the second magnet row 3 rotates, the first magnet row 1 rotates due to the magnetic interaction between the magnetic pole pairs of the first magnet row 1 and the second magnet row 3. In this case, the first magnet row 1 having a larger number of magnetic pole pairs than the second magnet row 3 rotates in a direction opposite to the rotation direction of the second magnet row 3 at a lower rotation speed than the second magnet row 3 (see Non-Patent Document 1). reference). The ratio Ph / Pl between the number Ph of the magnetic pole pairs 12 arranged in the first magnet row 1 and the number Pl of the magnetic pole pairs 32 arranged in the second magnet row 3 is equal to the second magnet row 3. The gear ratio of one magnet row 1 is obtained. And when the 2nd magnet row | line | column 3 carries out 1 rotation of the counterclockwise rotation, the 1st magnet row | line | column 1 rotates 3/7 clockwise.

  Embodiment 2 has the following effects. Lamination of the first magnet array 1, which generates a large amount of eddy current, with an isotropic R—Fe—B bond magnet having a high electrical resistivity and an anisotropic R—Fe—B sintered magnet having a high magnetic property By using the body, it is possible to reduce eddy current loss and prevent deterioration of magnetic characteristics. Since the bonded magnet is isotropic and the sintered magnet is anisotropic, the direction of magnetization of the bonded magnet is aligned with the direction of magnetization of the sintered magnet. It can be used.

(Embodiment 3)
FIG. 4 is a side sectional view showing a configuration example of the magnetic gear device according to the third embodiment. In the magnetic gear device according to the third embodiment, the first magnet row 1 is also a laminate in the first embodiment. In the following description, the same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  The first magnet row 1 has an inner cylindrical portion 11 made of a magnetic material. On the outer peripheral surface of the inner cylindrical portion 11, an outer peripheral surface side N-pole magnet 12a magnetized in the thickness direction and an outer peripheral surface side S. Three pairs of magnetic pole pairs 12 composed of polar magnets 12b are arranged at substantially equal intervals along the circumferential direction. The magnet 12a and the magnet 12b constituting the magnetic pole pair 12 are laminated bodies. The configuration of the first magnet row 1 is the same as that of the second embodiment except for the number of magnetic pole pairs. The magnetic body row 2 is the same as that in the first and second embodiments.

  Since the operation of the magnetic gear device is the same as that of the first embodiment, the description thereof is omitted.

  In the third embodiment, in addition to the effects achieved by the first embodiment, the following effects are achieved. By using the first magnet row 1 and the second magnet row 3 as a laminated body, eddy current loss can be further reduced.

(Embodiment 4)
FIG. 5 is a side cross-sectional view showing a configuration example of the magnetic gear device according to the fourth embodiment. In the magnetic gear device according to the fourth embodiment, the second magnet row 3 is also a laminate in the second embodiment. In the following description, the same components as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  The second magnet row 3 has an outer cylindrical portion 31 made of a magnetic material. On the inner peripheral surface of the outer cylindrical portion 31, a magnetic pole pair 32 composed of an inner peripheral surface side N-pole magnet 32a and an inner peripheral surface side S-pole magnet 32b magnetized in the thickness direction (cylinder radial direction) is circular. Three sets are arranged at substantially equal intervals along the circumferential direction. The magnet 32a and the magnet 32b which comprise the magnetic pole pair 32 are laminated bodies. The configuration of the second magnet array 3 is the same as that of the first embodiment except for the number of magnetic pole pairs. The magnetic body row 2 is the same as that in the first to third embodiments.

  The operation of the magnetic gear device is the same as that in the second embodiment.

  In the fourth embodiment, the following effects are obtained in addition to the effects obtained by the second embodiment. By using the first magnet row 1 and the second magnet row 3 as a laminated body, eddy current loss can be further reduced.

(Embodiment 5)
FIG. 6 is an exploded perspective view showing a configuration example of the magnetic gear device according to the fifth embodiment. FIG. 7 is a side sectional view showing a configuration example of the magnetic gear device according to the fifth embodiment. The magnetic gear device according to the fifth embodiment has a disc shape, and is a disc-shaped first magnet row 3001 and a disc-like shape arranged coaxially with a gap above the first magnet row 3001. A second magnet row 3003 and a disk-like magnetic body row 3002 arranged coaxially with a gap between the first magnet row 3001 and the second magnet row 3003 are provided.

The first magnet array 3001 has a first disk 3011 made of a magnetic material, and a magnetic pole pair 3012 made up of an upper N-pole magnet 3012a and an upper S-pole magnet 3012b is formed on the upper surface of the first disk 3011. Six sets are arranged at substantially equal intervals along the circumferential direction.
The second magnet array 3003 has a second disk 3031 made of a magnetic material, and a magnetic pole pair made up of a lower N-pole magnet 3032a and a lower S-pole magnet 3032b on the lower surface of the second disk 3031. Fourteen sets of 3032 are arranged at substantially equal intervals along the circumferential direction.

  The magnet 3032a and the magnet 3032b have a two-layer structure in the thickness direction. The magnet 3032a has a two-layer structure of a magnet 3032a1 and a magnet 3032a2, and the magnet 3032a2 facing the magnetic body row 3002 is thinner than the magnet 3032a1. The magnet 3032a2 is an isotropic R—Fe—B based bonded magnet. The magnet 3032a1 is an anisotropic R—Fe—B based sintered magnet. The magnet 3032b has the same configuration as the magnet 3032a except that the magnetic pole is different.

The magnetic body row 3002 is a disk-like shape that holds 20 magnetic bodies 3022 that are equal to the total number of pairs 6 and 14 of the magnetic pole pair 3012 and the magnetic pole pair 3032 that the first magnet row 3001 and the second magnet row 3003 have. A holding member 3021 is provided, and 20 magnetic bodies 3022 are arranged on the holding member 3021 at substantially equal intervals along the circumferential direction. In addition, the holding member 3021 has the magnetic body 3022 so that the distance in the rotation axis direction between each magnetic body 3022 and the second magnet array 3003 is shorter than the distance between each magnetic body 3022 and the first magnet array 3001. keeping.
In this case, an improvement in transmission torque can be expected.
The holding member 3021 holds the magnetic body 3022 so that the distance between each magnetic body 3022 and the second magnet array 3003 in the rotation axis direction is equal to the distance between each magnetic body 3022 and the first magnet array 3001. It may be set in consideration of the necessary transmission torque and the size of the magnetic gear device.

  The magnetic gear device configured as in the fifth embodiment also has the same effect as in the first embodiment. Further, the technical ideas of the second to fourth embodiments can be applied to the magnetic gear device according to the fifth embodiment. For example, in addition to the second magnetic body row 3003, the magnets 3012a and 3012b constituting the first magnet row 3001 may be a laminated body.

(Embodiment 6)
FIG. 8 is an exploded perspective view showing a configuration example of the magnetic gear device according to the sixth embodiment. FIG. 9 is a side sectional view showing an example of the configuration of the magnetic gear device according to the sixth embodiment. In the magnetic gear device according to the sixth embodiment, each constituent member is a long plate (rectangular plate) linear type, and a long plate-like first magnet row 4001 and above the first magnet row 4001. A long plate-like second magnet row 4003 arranged with a gap, and a long plate-like magnetic body row arranged with a gap between the first magnet row 4001 and the second magnet row 4003 4002. The longitudinal directions of the first magnet row 4001, the second magnet row 4003, and the magnetic body row 4002 are substantially the same.

The first magnet row 4001 includes a first long plate portion 4011 made of a magnetic material, and includes an upper N-pole magnet 4012a and an upper S-pole magnet 4012b on the upper surface of the first long plate portion 4011. Six magnetic pole pairs 4012 are arranged at substantially equal intervals per unit distance (ΔL) along the longitudinal direction.
The second magnet array 4003 has a second long plate portion 4031 made of a magnetic material, and a lower N-pole magnet 4032a and a lower S-pole magnet 4032b are formed on the lower surface of the second long plate portion 4031. Fourteen magnetic pole pairs 4032 are arranged at substantially equal intervals per unit distance ΔL along the longitudinal direction.

  The magnet 4032a and the magnet 4032b have a two-layer structure in the thickness direction. The magnet 4032a has a two-layer structure of a magnet 4032a1 and a magnet 4032a2, and the magnet 4032a2 facing the magnetic body row 4002 is thinner than the magnet 4032a1. The magnet 4032a2 is an isotropic R—Fe—B based bonded magnet. The magnet 4032a1 is an anisotropic R—Fe—B based sintered magnet. The magnet 4032b has the same configuration as the magnet 4032a except that the magnetic pole is different.

The magnetic body row 4002 is a long plate-like shape that holds 20 magnetic bodies 4022 that are equal to the total number of pairs 6 and 14 of the magnetic pole pair 4012 and the magnetic pole pair 4032 that the first magnet row 4001 and the second magnet row 4003 have. The holding member 4021 includes 20 magnetic bodies 4022 per unit distance ΔL that are arranged at substantially equal intervals along the longitudinal direction. The holding member 4021 holds the magnetic body 4022 such that the distance between each magnetic body 4022 and the second magnet array 4003 in the separation direction is shorter than the distance between each magnetic body 4022 and the first magnet array 4001. doing. In this case, an improvement in transmission torque can be expected.
The holding member 4021 holds the magnetic body 4022 such that the distance in the separation direction between each magnetic body 4022 and the second magnet array 4003 is equal to the distance between each magnetic body 4022 and the first magnet array 4001. It may be set in consideration of necessary transmission torque, dimensions of the magnetic gear device, and the like.

  The magnetic gear device configured as in the sixth embodiment also has the same effect as in the first embodiment. Also, the technical ideas of the second to fourth embodiments can be applied to the magnetic gear device according to the sixth embodiment. For example, in addition to the second magnetic body row 4003, the magnets 4012a and 4012b constituting the first magnet row 4001 may be a laminated body.

(Embodiment 7)
FIG. 10 is an exploded perspective view showing a configuration example of the magnetic gear device according to the seventh embodiment. FIG. 11 is a side sectional view showing a configuration example of the magnetic gear device according to the seventh embodiment. In the magnetic gear device according to the seventh embodiment, each constituent member is a cylindrical linear type, and is arranged coaxially with a cylindrical first magnet row 5001 and a gap on the outer peripheral side of the first magnet row 5001. The cylindrical second magnet array 5003 and a cylindrical magnetic body array 5002 arranged coaxially with a gap between the first magnet array 5001 and the second magnet array 5003 are provided.

The first magnet array 5001 has an inner cylindrical portion 5011 made of a magnetic material. On the outer peripheral surface of the inner cylindrical portion 5011, a magnetic pole pair 5012 consisting of an outer N-pole magnet 5012a and an outer S-pole magnet 5012b is centered. Six sets are arranged at substantially equal intervals per unit distance ΔL along the axial direction.
The second magnet array 5003 has an outer cylindrical portion 5031 made of a magnetic material, and an inner peripheral surface of the outer cylindrical portion 5031 is composed of an inner peripheral surface N-pole magnet 5032a and an inner peripheral surface S-pole magnet 5032b. Fourteen pairs of magnetic pole pairs 5032 are arranged at substantially equal intervals per unit distance ΔL along the central axis direction.

  The magnet 5032a and the magnet 5032b have a two-layer structure in the thickness direction. The magnet 5032a has a two-layer structure of a magnet 5032a1 and a magnet 5032a2, and the magnet 5032a2 facing the magnetic body row 5002 is thinner than the magnet 5032a1. The magnet 5032a2 is an isotropic R—Fe—B based bonded magnet. The magnet 5032a1 is an anisotropic R—Fe—B based sintered magnet. The magnet 5032b has the same configuration as the magnet 5032a except that the magnetic pole is different.

The magnetic body row 5002 is a cylindrical holder that holds 20 magnetic bodies 5022 that are equal to the sum of the number of pairs 6 and 14 of the magnetic pole pair 5012 and the magnetic pole pair 5032 included in each of the first magnet row 5001 and the second magnet row 5003. A member 5021 is provided, and 20 magnetic bodies 5022 per unit distance ΔL are arranged on the holding member 5021 at substantially equal intervals along the central axis direction. The holding member 5021 holds the magnetic body 5022 so that the distance between each magnetic body 5022 and the second magnet array 5003 in the radial direction is shorter than the distance between each magnetic body 5022 and the first magnet array 5001. doing. In this case, an improvement in transmission torque can be expected.
The holding member 5021 may hold the magnetic body 5022 so that the distance in the radial direction between each magnetic body 5022 and the second magnet array 5003 is equal to the distance between each magnetic body 5022 and the first magnet array 5001. It may be set in consideration of the transmission torque and the dimensions of the magnetic gear device.

  The magnetic gear device configured as in the seventh embodiment also has the same effect as in the first embodiment. Further, the technical ideas of the second to fourth embodiments can be applied to the magnetic gear device according to the seventh embodiment. For example, in addition to the second magnetic body row 5003, the magnets 5012a and 5012b constituting the first magnet row 5001 may be a laminated body.

(Embodiment 8)
FIG. 12 is a side sectional view showing a configuration example of the magnetic gear device according to the eighth embodiment. The distance between the magnetic body row 2 and the second magnet row 3 is smaller than the distance between the magnetic body row 2 and the first magnet row 1. The cross section of the magnetic body 22 in the magnetic body row 2 is trapezoidal. That is, the width of the magnetic body 22 on the second magnet row side is smaller than the width on the first magnet row side. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The magnetic gear device according to the eighth embodiment has the following effects in addition to the effects exhibited by the magnetic gear device according to the first embodiment.
Since the magnetic body row 2 is close to the second magnet row 3, the transmission torque is improved.
This is due to the following reason. The magnetic pole pairs 12 of the first magnet row 1 on the high speed rotation side have a longer pitch than the second magnet row 3 on the low speed rotation side. The magnetic flux from the magnets 12a and 12b arranged at a long pitch on the high speed rotation side spreads more than the magnets 32a and 32b on the low speed rotation side, and a strong magnetic force reaches the second magnet row 3, but at a short pitch. The magnetic flux from the arranged low-speed rotating magnets 32 a and 32 b closes in the vicinity of the second magnet row 3, and there is a tendency that strong magnetic force does not reach the first magnet row 1.
Therefore, when the magnetic body 22 of the magnetic body row 2 modulates the magnetic flux from the magnets on the first magnet row 1 side and the second magnet row 3 side, the magnets 32a and 32b on the low speed rotation side (the second magnet row side) ), The magnetic flux is modulated by arranging the magnetic body row 2 and the magnetic flux caused by the magnets 32a and 32b on the low-speed rotation side that closes in the vicinity, and the high-speed rotation side (first magnet) reaching far away It is considered that the magnetic flux is more strongly modulated by the action of both the magnetic flux caused by the magnets 12a and 12b in the row), and as a result, a larger torque can be transmitted.

Next, the effect that the width of the magnetic body 22 of the magnetic body row 2 on the second magnet row 3 side is smaller than the width of the first magnet row 1 side will be described.
In this case, the magnetic body row 2 rotates and a centrifugal force acts on each magnetic body, so that a force against the centrifugal force acts even if a force acts radially outward. Further, since the magnetic body row 2 is close to the second magnet row 3 side, an attractive force with the second magnet row 3 works, but with this configuration, a force against the attractive force with the second magnet row 3 works.
For this reason, even if the holding structure for holding the magnetic body 22 is not provided on the outer peripheral surface side of the magnetic body row 2, the magnetic body 2 is separated from the member (partition wall) holding the magnetic body 22 by centrifugal force or attraction force. Can be prevented. Further, even when a holding structure is provided, it is not necessary to make it a strong structure.

(Embodiment 9)
FIG. 13 is a side cross-sectional view illustrating a configuration example of the magnetic gear device according to the ninth embodiment. In the magnetic gear device according to the ninth embodiment, the magnet that also constitutes the first magnet row 1 in the eighth embodiment is a laminate. In the following description, the same components as those in the eighth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The magnets 12a and 12b constituting the first magnet row 1 have a two-layer structure. The configuration of the first magnet row 1 is the same as that of the third embodiment.

  The magnetic gear device according to the ninth embodiment has the following effects in addition to the effects exhibited by the magnetic gear device according to the eighth embodiment. In addition to the magnets 32a and 32b constituting the second magnet row 3, the magnets 12a and 12b constituting the first magnet 1 are also made of a laminated body, so that eddy current loss can be further reduced.

The technical features (components) described in each embodiment can be combined with each other, and new technical features can be formed by combining them.
The embodiments disclosed herein are illustrative in all respects and should not be considered as restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 1 1st magnet row | line | column 11 Inner cylindrical part 12 Magnetic pole pair 12a Magnet 12a1 Anisotropic R-Fe-B type sintered magnet 12a2 Isotropic R-Fe-B type bonded magnet 12b Magnet 12b1 Anisotropic R-Fe-B Sintered magnet 12b2 Isotropic R-Fe-B bonded magnet 2 Magnetic body array 21 Partition wall 22 Magnetic body 3 Second magnet array 31 Outer cylindrical part 32 Magnetic pole pair 32a Magnet 32a1 Anisotropic R-Fe-B system firing Bonding magnet 32a2 Isotropic R-Fe-B bond magnet 32b Magnet 32b1 Anisotropic R-Fe-B sintered magnet 32b2 Isotropic R-Fe-B bond magnet

Claims (3)

A first magnet row having a cylindrical shape and a plurality of pairs of magnetic poles arranged equally along the circumferential direction and a cylindrical shape on the outer side of the first magnet row so as to face the first magnet row A second magnet array that is coaxially arranged and has a plurality of magnetic pole pairs equally arranged along the circumferential direction at a shorter pitch than the first magnet array; and a cylindrical shape, and the first magnet array And a magnetic gear device that is disposed between the second magnet rows and a magnetic row in which a plurality of magnetic bodies are equally arranged along the circumferential direction.
The distance in the facing direction between the magnetic body row and the second magnet row is shorter than the distance in the facing direction between the magnetic body row and the first magnet row,
The magnetic body is
The first magnet row side is wider in the circumferential direction than the second magnet row side,
The second magnet row includes a first layer made of an anisotropic R-Fe-B sintered magnet and a second layer made of an isotropic R-Fe-B bonded magnet. The second layer is made of the magnetic material. A magnetic gear device, wherein the magnetic gear device is arranged on a side facing the row. The first magnet row includes a first layer made of anisotropic R—Fe—B based sintered magnet and a second layer made of isotropic R—Fe—B based bonded magnet. The second layer is made of the magnetic material. The magnetic gear device according to claim 1 , wherein the magnetic gear device is arranged on a side facing the row. The magnetic gear device according to claim 1 , wherein the first magnet row is made of an anisotropic R—Fe—B based sintered magnet.

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