JP2017187130A - Power transmission device and drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device which can reduce a transmission loss, and can exert high reliability, and a drive unit.SOLUTION: A roller 10 and a rotor 11 are arranged in a state that a rotating shaft 100 and a rotating shaft 110 are arranged with an interval in parallel with each other. In rotor discs 101, 102 of the rotor 10, a plurality of magnets 103, 104 are arranged at external edges of main surfaces 101a, 102a. A rotor disc 111 of the rotor 11 is arranged between the rotor discs 101, 102 in an X-axial direction, and one-side portions of its external edge oppose each other. A plurality of magnets 114 are arranged at the external edge of one main surface 111a of the rotor disc 111, and a plurality of magnets 115 are arranged at the external edge of the other main surface 111b. In a region A, the magnets 114 and the magnets 103 oppose each other with an interval, and the magnets 115 and the magnets 104 oppose each other with an interval. The rotor 10 and the rotor 11 are synchronously linked with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power transmission device and a drive device using a magnetic gear.

  Conventionally, a power transmission device using a magnetic gear has been researched and developed. For example, Patent Document 1 discloses a structure of a magnetic gear reducer that is an example of a power transmission device.

  In the technique disclosed in Patent Document 1, a non-contact power transmission device is employed for power transmission between the output shaft of the electric motor and the worm shaft of the worm gear mechanism. Specifically, the output shaft of the electric motor and the worm shaft of the worm gear mechanism are arranged in parallel and eccentric. Disc-shaped discs are fixed to the end of the output shaft and the end of the worm shaft, respectively. The disk on the worm shaft side has a larger diameter than the disk on the output shaft side. A plurality of magnets are provided on the outer edges of the respective disks in an annular shape in plan view on the respective outer edges. The magnet provided on the disk on the worm shaft side and the magnet provided on the disk on the output shaft side are partially opposed to each other.

  In a non-contact power transmission device using such a magnetic gear, transmission loss can be reduced as compared with a power transmission device using a gear that is in direct and physical contact.

JP2015-229378A

  However, the power transmission device disclosed in Patent Document 1 has a problem in terms of reliability. That is, in the power transmission device disclosed in Patent Document 1, the magnet provided on the disk on the worm shaft side and the magnet provided on the disk on the output shaft side are in the axial direction of the output shaft and the worm shaft. Opposite. For this reason, in the power transmission device disclosed in Patent Document 1, a force that attracts magnets acts, and this force causes the force to continuously act in the axial direction on the output shaft and the worm shaft. Become. Therefore, in the power transmission device disclosed in Patent Document 1, a load caused by the attractive force between the opposing magnets always acts on the output shaft and the worm shaft, and further on these bearings, and the reliability is high. Problems arise from a viewpoint.

  It is an object of the present invention to provide a power transmission device and a driving device that can reduce transmission loss and can achieve high reliability.

  A power transmission device according to an aspect of the present invention includes a first rotor and a second rotor. The first rotor includes a first rotating shaft extending in a first direction, a first rotor disk fixed to the first rotating shaft and having a second direction perpendicular to the first direction as a radial direction, and one of the first rotor disks And a plurality of first magnets arranged in an annular shape in plan view at the outer edge of the other main surface of the first rotor disk.

  The second rotor extends in the first direction and is disposed at an interval in the second direction with respect to the first rotation shaft, and is fixed to the second rotation shaft, and has a second direction. A second rotor disk having a radial direction and being spaced apart from the first rotor disk in the first direction; and being fixed to the second rotating shaft, the second direction being a radial direction, and the first direction In FIG. 3, a third rotor disk is disposed on the opposite side of the first rotor disk from the second rotor disk, and is spaced from the first rotor disk in the first direction, and the second rotor disk in the first direction. A plurality of second magnets arranged in an annular shape in plan view on the outer edge portion of the main surface on the first rotor disk side, and the outer edge of the main surface on the first rotor disk side in the first direction in the third rotor disk A plurality of parts arranged in an annular shape in plan view 3 has a magnet, a.

  A portion of the plurality of first magnets, a portion of the plurality of second magnets, and a portion of the plurality of third magnets face each other with a space therebetween, and the first rotor and the second rotor are The plurality of first magnets, the plurality of second magnets, and the plurality of third magnets are interlocked in a synchronized state with magnetic force.

  In the power transmission device according to this aspect, in the first direction, the first rotor disk of the first rotor is disposed between the second rotor disk and the third rotor disk of the second rotor. A part of the plurality of first magnets arranged on one main surface of the first rotor disk and a part of the plurality of second magnets arranged on the opposing main surface of the second rotor disk are spaced from each other. The magnetic force acts on the facing portion. Similarly, a part of the plurality of first magnets arranged on the other main surface of the first rotor disk and a part of the plurality of third magnets arranged on the opposing main surface of the third rotor disk are spaced from each other. It opens and opposes, and a magnetic force acts also in the said opposing part. In the power transmission device according to this aspect that employs such a configuration, when the first rotor and the second rotor are rotated, the force that the first magnet and the second magnet that face each other in the opposing region attract each other, and the same opposing region. The force attracted by the first magnet and the third magnet facing each other in FIG. Therefore, in the power transmission device according to this aspect, it is possible to cancel the force in the first direction applied to the first rotating shaft and the second rotating shaft, and the force is continuously generated only in one of the first directions. There is nothing.

  In addition, since the power transmission device according to this aspect is a non-contact type power transmission device using magnetic gears, the transmission loss is reduced more than the power transmission device using gears that are in direct and physical contact. Can be planned. In particular, when the input rotational speed is an extremely high rotation (for example, 100000 rpm or more), it is preferable from the viewpoint of realizing high transmission efficiency.

  As described above, the power transmission device according to this aspect can reduce transmission loss and achieve high reliability.

  In the power transmission device according to another aspect of the present invention, in the configuration of the above aspect, a part of the plurality of first magnets, a part of the plurality of second magnets, and a part of the plurality of third magnets are mutually connected. In a region opposite to each other with a gap (sometimes referred to as “opposing region”), one of the first and second magnets facing each other is an S pole and the other is an N pole, One of the first magnet and the third magnet is an S pole and the other is an N pole, and the two first magnets are arranged back to back in the first direction with the first rotor disk sandwiched in the thickness direction. One of the magnets can be an S pole and the other an N pole.

  In the power transmission device according to this aspect, the first and second magnets facing each other have different poles, the first and third magnets facing each other have different poles, and the first rotor disk has a thickness thereof. Two first magnets arranged back to back across the direction are different from each other. Thereby, the attracting force is generated between the opposing magnets, and no repulsive force is generated. The relationship between the magnetic poles in the thickness direction of the first rotor disk is the same. For this reason, it becomes easy to form a smooth magnetic flux flow, and the transmission efficiency can be improved.

  In the power transmission device according to another aspect of the present invention, in the configuration of the above aspect, the second rotor disk, the third rotor disk, and the second rotation shaft may be made of a magnetic material.

  In the power transmission device according to this aspect, in addition to the above advantages, a flow of magnetic flux is formed by a loop in each part of the first rotor disk, the second rotor disk, the second rotating shaft, and the third rotor disk. be able to. Thereby, the advantage that the transmission efficiency can be further improved can be obtained.

In the power transmission device according to another aspect of the present invention, in the configuration of the above aspect, a part of the plurality of first magnets, a part of the plurality of second magnets, and a part of the plurality of third magnets are opposed to each other. The areas facing the magnets are defined as S ₁ and S ₂ , the internal magnetic path areas of the second and third rotor disks are defined as S ₃ and S _4, and the second rotating shaft is disconnected in the second direction. when the area and _{S 5,} with respect to _{S 1} and _{S 2,} is _{S 3} and _{S 4} and _{S 5} is equal to or higher, and can be.

  In the power transmission device according to this aspect, in addition to the above-described advantages, it is possible to reduce the magnetic flux leakage in the formed magnetic flux flow, and to obtain an advantage that the transmission efficiency can be further improved. .

Further, in the power transmission device according to another aspect of the present invention, in the configuration of the above aspect, the pitch circle diameter (PCD) according to the arrangement of the plurality of first magnets when the first rotor disk is viewed in plan view. the in the case where the D _1, in the case where the second rotor disc in plan view, the pitch circle diameter of the arrangement of the plurality of second magnets (P.C.D) and D _2, in plan view a third rotor disk , the pitch circle diameter of the arrangement of the plurality of third magnets (P.C.D) when the _{D 3,} with respect to _{D 2} and _{D 3, D 1} is large, and can be.

  In the power transmission device according to this aspect, in addition to the above advantages, a function as a speed reducer or a speed increaser can be obtained. In this case, in particular, when the input rotational speed is very high (for example, 100000 rpm or more), the load on the first rotating shaft and the second rotating shaft or the first direction (axial direction) with respect to these bearings is reduced. The reduction is suitable for realizing a large reduction gear ratio or speed increase ratio structurally.

Further, in the power transmission device according to the above aspect, since D ₁ is larger than D ₂ and D ₃ , the diameters of the second rotor disk and the third rotor disk are smaller than those of the first rotor disk. can do. For this reason, in the power transmission device according to this aspect, a combination of two large-diameter disks and one small-diameter disk is obtained by combining one large-diameter disk and two small-diameter disks. Compared to the above, the weight can be reduced.

  Moreover, in the power transmission device according to another aspect of the present invention, in the configuration of the above aspect, each of the plurality of second magnets disposed on the second rotor disk and the plurality of third magnets disposed on the third rotor disk includes: It can also be any of 4-pole, 6-pole, and 8-pole.

  In the power transmission device according to this aspect, in addition to the above advantages, the second magnet and the third magnet arranged on the second rotor disk and the third rotor disk having a small diameter are used in a wider area in the facing region between the magnets. The advantage of being able to do so can also be obtained. Moreover, in the opposing area | region of a 1st magnet, a 2nd magnet, and a 3rd magnet, the area of the overlapping part of the same poles of a magnet accompanying rotation of a 1st rotor and a 2nd rotor can be made small. Thus, the negative force acting in the first direction between the first rotor disk, the second rotor disk, and the third rotor disk can be reduced, which is suitable for realizing high torque transmission. .

  In the power transmission device according to another aspect of the present invention, in the configuration of the above aspect, each of the plurality of first magnets, the plurality of second magnets, and the plurality of third magnets is a polar anisotropic magnet. It can also be.

  In the power transmission device according to this aspect, the magnetic flux flows more smoothly on the magnetic flux exchange surface near the boundary between the N pole and the S pole, and a larger magnetic flux flows near the center of each magnetic pole. Therefore, in addition to the above advantages, the power transmission device according to this aspect can further improve transmission efficiency, and is excellent for realizing high torque transmission.

  In addition, the power transmission device according to another aspect of the present invention includes a third rotor and a fourth rotor in addition to the configuration of the above aspect. The third rotor extends in the first direction, and is fixed to the third rotation shaft and a third rotation shaft that is disposed at an interval in the second direction with respect to the first rotation shaft and the second rotation shaft. The second direction is a radial direction, and the fourth rotor disk is disposed between the second rotor disk and the third rotor disk in the first direction, and is fixed to the third rotating shaft, and the second direction is A fifth rotor disk having a radial direction and being spaced apart from the fourth rotor disk in the first direction; and being fixed to the third rotating shaft, the second direction being a radial direction, and the first direction And a sixth rotor disk disposed on the opposite side to the fourth rotor disk across the fifth rotor disk and spaced from the fifth rotor disk in the first direction, and one main surface of the fourth rotor disk Other outer edge and other 4th rotor disk A plurality of fourth magnets arranged in an annular shape in a plan view on the outer edge portion of the main surface, and an annular shape in a plan view on the outer edge portion of the main surface on the sixth rotor disk side in the first direction of the fifth rotor disk. A plurality of fifth magnets arranged on the outer edge of the main surface of the sixth rotor disk on the side of the fifth rotor disk in the first direction, and a plurality of sixth magnets arranged in an annular shape in plan view; Have.

  The fourth rotor extends in the first direction, and is fixed to the fourth rotation shaft, and a fourth rotation shaft that is disposed at an interval in the second direction with respect to the first rotation shaft and the third rotation shaft. A seventh rotor disk having a radial direction in the second direction and disposed between the fifth rotor disk and the sixth rotor disk in the first direction, and an outer edge portion of one main surface of the seventh rotor disk And a plurality of seventh magnets arranged in an annular shape in plan view on the outer edge portion of the other main surface of the seventh rotor disk.

  Further, in addition to the above configuration, the first rotor is fixed to the first rotating shaft, the second rotor is the radial direction, and the eighth rotor is disposed at a distance from the first rotor disk in the first direction. The disk is fixed to the first rotating shaft, the second direction is the radial direction, and the eighth rotor disk and the first direction are opposite to the eighth rotor disk across the seventh rotor disk in the first direction. And a plurality of first rotors arranged in an annular shape in plan view on the outer edge portion of the main surface of the eighth rotor disk on the side of the seventh rotor disk in the first direction of the eighth rotor disk. 8 magnets and a plurality of ninth magnets arranged in an annular shape in plan view on the outer edge of the main surface of the ninth rotor disk on the seventh rotor disk side in the first direction.

  In the power transmission device according to this aspect, a part of the plurality of fourth magnets, a part of the plurality of second magnets, and a part of the plurality of third magnets face each other with a space therebetween, A part of the plurality of seventh magnets, a part of the plurality of fifth magnets, and a part of the plurality of sixth magnets face each other with a space therebetween, and a part of the plurality of seventh magnets A part of the eighth magnet and a part of the plurality of ninth magnets face each other with a space therebetween. As a result, the second rotor and the third rotor are interlocked with each other in synchronism with the magnetic forces of the plurality of fourth magnets, the plurality of second magnets, and the plurality of third magnets, and the fourth rotor, the first rotor, The third rotor is interlocked with a plurality of seventh magnets, a plurality of fifth magnets, a plurality of sixth magnets, a plurality of eighth magnets, and a plurality of ninth magnets in a synchronized state.

  In the power transmission device according to this aspect, with the above configuration, the rotational driving force of one of the second rotating shaft of the second rotor and the fourth rotating shaft of the fourth rotor causes the first rotating shaft and the third rotor of the first rotor to rotate. And is transmitted to the other of the second rotating shaft of the second rotor and the fourth rotating shaft of the fourth rotor.

  In the power transmission device according to this aspect, the power transmission between the second rotor and the fourth rotor is executed in a state where the power transmission path is divided into the first rotor and the second rotor, It is particularly advantageous for high torque transmission. Further, the arrangement of the first rotor and the third rotor with respect to the second rotor and the fourth rotor can provide a symmetrical arrangement, and generation of an undesired moment as the entire apparatus can be suppressed.

  The drive device according to this aspect includes a drive source that generates a rotational drive force, and a power transmission device that transmits the rotational drive force from the drive source, and the power transmission device according to any one of the above aspects A transmission device is provided.

  In the driving device according to this aspect, the rotational driving force generated by the driving source can be transmitted and output with a small loss. In particular, when an electric motor having a very high rotation speed (for example, 100000 rpm or more) is used as a drive source, it is preferable from the viewpoint of realizing high transmission efficiency.

  Further, similarly to the above, it is possible to suppress a load from being continuously applied in the first direction in the power transmission device, and to obtain high reliability.

  In the power transmission device and the drive device according to each of the above aspects, transmission loss can be reduced and high reliability can be realized.

1 is a schematic diagram showing a configuration of a power transmission device 1 according to a first embodiment of the present invention. (A) is a schematic plan view of the large-diameter rotor disk 111, and (b) is a schematic plan view of the small-diameter rotor disk 101. It is the elements on larger scale which extracted and expanded the B section of FIG. (A) is a schematic perspective view showing a rotor disc, (b) is a partially enlarged view of an extracted portion C, (c) is an schematic view showing a magnetic flux direction of the magnet MG ₁ , (d) is a schematic view showing a magnetic flux direction of the magnet MG _2, (e) is a schematic diagram showing the magnetic field lines at _D 1 -D ₁ cross-section of (c), (f), the ( is a schematic diagram showing the magnetic field lines at _D 2 -D ₂ cross-section of d). (A) is a schematic diagram which shows the magnetic force line in a polar anisotropic magnet, (b) is a schematic diagram which shows the magnetic force line in an isotropic magnet. It is a schematic diagram which shows the structure of the power transmission device 2 which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the power transmission device 3 which concerns on 3rd Embodiment of this invention. (A), (b) is a schematic diagram showing the relationship with a large-diameter rotor disk in the case of employing a small-diameter rotor disk having a four-pole configuration, and (c), (d) are small-diameter rotors having a two-pole configuration. It is a schematic diagram which shows the relationship with a large diameter rotor disk at the time of employ | adopting a disk. It is a schematic diagram which shows the structure of the drive device 5 which concerns on 4th Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[First embodiment]
1. Overall Configuration The overall configuration of the power transmission device 1 according to the present embodiment will be described with reference to FIG. In FIG. 1, only members that are the main components are extracted and illustrated, and other members (for example, members such as bearings) are not illustrated.

  As shown in FIG. 1, the power transmission device 1 includes three rotors 10, 11, and 12. The rotor 10 includes a rotating shaft 100 extending in the X-axis direction, and two rotor disks 101 and 102 that are fixed to the rotating shaft 100 and have a radial direction in a plane direction orthogonal to the X-axis direction. These rotor disks 101 and 102 have a disk shape in plan view from the X-axis direction. The rotor 10 has a plurality of magnets 103 disposed on the outer edge portion of the main surface 101a on the right side in the X-axis direction of the rotor disk 101 and the outer edge portion of the main surface 102a on the left side in the X-axis direction of the rotor disk 102. A plurality of magnets 104.

  The rotor 11 has a rotation shaft 110 that extends in the X-axis direction and is arranged at an interval in the Z-axis direction with respect to the rotation shaft 100 of the rotor 10. Three rotor disks 111, 112, 113 are fixed to the rotating shaft 110 with the radial direction being the plane direction orthogonal to the X-axis direction. These rotor disks 111, 112, and 113 also have a disk shape in plan view from the X-axis direction. The rotor disk 111 is fixed to the rotation axis 110 on the left side in the X-axis direction, and is disposed at a position sandwiched between the rotor disk 101 and the rotor disk 102 of the rotor 10 in the X-axis direction.

  On the other hand, the rotor disk 112 is fixed at a position spaced from the rotor disk 111 to the right in the X-axis direction with respect to the rotating shaft 110, and the rotor disk 113 is further spaced from the rotor disk 112 to the right in the X-axis direction. It is fixed at the position.

  The rotor 11 has a plurality of magnets 114 disposed on the outer edge portion of the main surface 111a on the left side in the X-axis direction of the rotor disk 111 and the outer edge portion of the main surface 111b on the right side in the X-axis direction of the rotor disk 111. The plurality of magnets 115 and the plurality of magnets 116 disposed on the outer edge portion of the main surface 112a on the right side in the X-axis direction of the rotor disk 112 and the outer edge portion of the main surface 113a on the left side in the X-axis direction of the rotor disk 113. A plurality of magnets 117.

  The rotor 12 extends in the X-axis direction, is spaced in the Z-axis direction with respect to the rotating shaft 110 of the rotor 11, and is disposed with a rotating shaft 120 that is spaced from the rotating shaft 100 of the rotor 10 in the X-axis direction. Have A rotor disk 121 having a radial direction in a plane direction orthogonal to the X-axis direction is fixed to the rotating shaft 120. The rotor disk 121 also has a disk shape in plan view from the X-axis direction. The rotor disk 121 is disposed at a position sandwiched between the rotor disk 112 and the rotor disk 113 of the rotor 11 in the X-axis direction with respect to the rotation shaft 120.

  The rotor 12 has a plurality of magnets 122 disposed on the outer edge portion of the main surface 121a on the right side in the X-axis direction of the rotor disk 121 and the outer edge portion of the main surface 121b on the left side in the X-axis direction of the rotor disk 121. A plurality of magnets 123 are provided.

  Here, regarding the plurality of magnets 103, 104, 114, 115, 116, 117, 122, 123, when the rotor disks 101, 102, 111, 112, 113, 121 are viewed in plan from the X-axis direction, respectively. They are arranged in an annular shape (in FIG. 1, only some of the magnets are shown in a simplified manner).

Some of the plurality of magnets 114 disposed on the main surface 111a of the rotor disc 111 is in the area A ₁ enclosed by a two-dot chain line, for some of the plurality of magnets 103 disposed in the rotor disc 101, Opposite with an interval in the X-axis direction. Also, some of the plurality of magnets 115 disposed on the main surface 111b of the rotor disc 111 is in the region _{A 1,} to a part of the plurality of magnets 104 disposed in the rotor disc 102, interval in the X-axis direction Opposite with a gap.

Here, in the region A1, _one of the opposing magnets 114 and 103 is the S pole and the other is the N pole. Similarly, in the region A1, _one of the opposing magnets 115 and 104 is the S pole and the other is the N pole. One of the magnets 114 and 115 arranged back to back in the X-axis direction with the rotor disk 111 sandwiched in the thickness direction is an S pole and the other is an N pole.

Some of the plurality of magnets 122 disposed in the rotor disk 121, in the area A ₂ enclosed by a two-dot chain line, for some of the plurality of magnets 116 disposed on the rotor disk 112, in the X-axis direction Opposes at intervals. Similarly, a portion of the plurality of magnets 123 disposed in the rotor disc 121, in the area A _2, with respect to some of the plurality of magnets 117 disposed in the rotor disc 113, spaced in the X-axis direction Opposite in state.

Here, even in a region _{A 2,} magnet 122 and the magnet 116 opposite to it one of a S pole, and the other is N pole. Similarly, in the region A ₂ , one of the opposing magnets 123 and 117 is the S pole and the other is the N pole. Further, one of the magnet 122 and the magnet 123 arranged back to back in the X-axis direction with the rotor disk 121 sandwiched in the thickness direction is an S pole and the other is an N pole.

Since the power transmission device 1 has the above-described configuration, the power transmission path PW ₁ is formed and functions as a non-contact type speed reducer using a magnetic gear. For example, when a rotational driving force is input to the rotating shaft 100 of the rotor 10 (IN ₁ ), power is transmitted to the rotating shaft 110 of the rotor 11 at a low speed and a high torque, and the rotation of the rotor 12 is further increased. The shaft 120 is rotated at a low speed and increased in torque (OUT ₁ ). As an example, the ratio of the rotational speed of the rotating shaft 100 of the rotor 10, the rotational speed of the rotating shaft 110 of the rotor 11, and the rotational speed of the rotating shaft 120 of the rotor 12 is 100,000 rpm: 10000 rpm: 1000 rpm.

  In the power transmission device 1, when the input and output of the rotational driving force are switched, the power transmission device 1 functions as a speed increaser.

2. Arrangement form of magnets 103, 104, 114, 115, 116, 117, 122, 123 with respect to the rotor disks 101, 102, 111, 112, 113, 121 Arrangement form of magnets 114, 115, 122, 123 with respect to the rotor disks 111, 121 Will be described with reference to FIG. 2A shows only the arrangement of the magnets 114 with respect to the main surface 111a of the rotor disk 111, the arrangement of the magnets 115 with respect to the main surface 111b of the rotor disk 111, and the main surface of the rotor disk 121. The same applies to the arrangement of the magnets 122 and 123 with respect to 121a and 121b.

  As shown in FIG. 2A, a plurality of magnets 114 are arranged on the outer edge portion of the main surface 111a with respect to the rotor disk 111 having a disk shape in plan view. The plurality of magnets 114 have S-poles and N-poles alternately arranged in the circumferential direction, and form a circular arrangement in plan view as a whole.

  In the present embodiment, a 40-pole configuration is used as an example. In the present embodiment, the plurality of magnets 114 are arranged at the outermost edge of the rotor disk 111, but the present invention is not necessarily limited to this.

  Next, the arrangement of the magnets 103, 104, 116, 117 with respect to the rotor disks 101, 102, 112, 113 will be described with reference to FIG. 2B shows only the arrangement of the magnets 103 with respect to the main surface 101a of the rotor disk 101, the arrangement of the magnets 104 with respect to the main surface 102a of the rotor disk 102, and the main surface of the rotor disk 112. The same applies to the arrangement of the magnet 116 with respect to 112a and the arrangement with respect to the main surface 113a of the rotor disk 113.

  As shown in FIG. 2B, a plurality of magnets 103 are arranged on the outer edge portion of the main surface 101a even for the rotor disk 101 having a disk shape with a small diameter in plan view. The plurality of magnets 103 have S-poles and N-poles alternately arranged in the circumferential direction, and form a circular arrangement in plan view as a whole. In the present embodiment, a four-pole configuration is used as an example, but a six-pole or eight-pole configuration may be used. This can be set based on the relationship with the reduction ratio.

  Further, although the plurality of magnets 103 are arranged at the outermost edge portion of the small-diameter rotor disk 103, the present invention is not necessarily limited thereto.

As shown in FIGS. 2A and 2B, in the power transmission device 1 as a speed reducer, a plurality of power transmission paths PW ₁ (see FIG. 1) in the region A ₁ to the rotor disk 101 on the downstream side. Pitch circle diameter (PCD) D ₁₀₃ relating to the arrangement of the plurality of magnets 114 on the rotor disk 111 on the upstream side, with respect to the pitch circle diameter (PCD) D ₁₀₃ relating to the arrangement of the magnets 103. ₁₁₄ is large. The reduction ratio can be defined by the ratio of the pitch circle diameter D ₁₀₃ and the number of magnets 103 (number of poles) to the pitch circle diameter D ₁₁₄ and the number of magnets 114 (number of poles).

3. In the power transmission device 1 according to the present embodiment, the rotary shafts 100, 110, 120 and the rotor disks 101, 102, 111, 112, 113, 121 are provided in the regions A ₁ , A ₂ and the peripheral region. It is made of a magnetic material. As a result, the magnetic flux flow MF ₁ can be formed in the areas A ₁ and A ₂ and the peripheral area as shown by being surrounded by a broken line in FIG. In FIG. 3, are illustrated only the flow of the magnetic flux MF ₁ in a region A _1, it is possible to form a flow of magnetic flux in the same manner for the region A _2.

Furthermore, as shown in FIG. 3, the power transmission apparatus 1, the magnet opposing area between the magnet 114 and the magnet 103, and magnet facing area between the magnet 115 and the magnet 104 and _{S OP.} The inner magnetic path area of the rotor disk 101 and _{S 101,} the inner magnetic path area of the rotor disk 102 and _{S 102.} Then, when the cross-sectional area of a plane direction perpendicular to the X-axis direction in the rotation shaft 100 and _{S 100,} in this _embodiment, with respect to _{S OP,} is S _{101, S 102} and _{S 100} is equal to or higher.

By defining in this way, it is possible to reduce the magnetic flux leakage in the region A ₁ and the peripheral region thereof. As a result, the transmission efficiency can be improved and a large torque power can be transmitted.

4). Adoption of Polar Anisotropic Magnet In the power transmission device 1 according to the present embodiment, an isotropic magnet can be adopted for the magnets 103, 104, 114, 115, 116, 117, 122, 123, but the anisotropic It is preferable to employ a magnet. This will be described with reference to FIGS. 4 and 5. FIG.

As shown in FIG. 4 (a), the outer edge of the rotor disk, it is assumed a state in which the magnet MG ₁ and the magnet MG ₂ are arranged alternately in the circumferential direction. Magnet MG ₁ and the magnet MG ₂ are both a polar anisotropic magnet, which is one S pole, and the other N-pole. FIG. 4B is an enlarged view of a portion C in FIG. 4A, and the front side of the drawing is the magnetic flux exchange surface side.

As shown in FIG. 4 (c), the magnet MG _1, in plan view, magnetic flux direction faces the inside of the arc, as shown in FIG. 4 (d), the magnet MG _2, in plan view, the magnetic flux direction Look outside the arc.

Figure 4 (e) showing the D ₁ -D ₁ section of FIG. 4 (c), it can be seen that point toward which the magnetic flux converges toward the flux exchange surface. On the other hand, in FIG. 4 (f) showing the D ₂ -D ₂ cross section of FIG. 4 (d), it can be seen that the magnetic flux is directed in a direction to diverge from the magnetic flux exchange surface side toward the opposite surface.

  Next, as shown in FIG. 5 (a), when a polar anisotropic magnet is employed, the magnetic lines of force increase in density on the magnet surface side, and a large magnetic force can be obtained.

  On the other hand, as shown in FIG. 5B, when an isotropic magnet is employed, the density of magnetic lines of force on the magnet surface side is lower than when a polar anisotropic magnet is employed. It can be seen that only a low magnetic force can be obtained.

  As can be seen from the above, in the power transmission device 1 according to the present embodiment, the magnets 103, 104, 114, 115, 116, 117, 122, and 123 made of polar anisotropic magnets are used, so The flow of magnetic flux on the side of the magnetic flux exchange surface near the pole boundary is smoother, and a larger flow of magnetic flux is formed near the center of each pole. Therefore, the power transmission device 1 can perform power transmission with high efficiency and high torque as compared with the case where an isotropic magnet is employed.

5. Superiority In the power transmission device 1 according to the present embodiment, the rotor disk 111 of the rotor 11 is disposed between the rotor disks 101 and 103 of the rotor 10 in the X-axis direction. Then, in the region _{A 1,} a portion of the plurality of magnets 114 disposed on the main surface 111a of the rotor disk 111, a portion with spacing of a plurality of magnets 103 disposed on the main surface 101a of the rotor disc 101 opened The magnetic force acts on the facing portion. Similarly, a part of the plurality of magnets 115 arranged on the main surface 111b of the rotor disk 111 and a part of the plurality of magnets 104 arranged on the main surface 102a of the rotor disk 102 are opposed to each other with a space therebetween. Magnetic force also acts on the facing portion.

  In the power transmission device 1 adopting such a configuration, when the rotor 10 and the rotor 11 are rotated, the magnet 103 of the rotor disk 101 and the magnet 114 facing the rotor disk 111 attract each other and the magnet of the rotor disk 102. 104 and the force attracted by the opposing magnets 115 of the rotor disk 111 act in a direction that cancels each other. Therefore, in the power transmission device 1, it is possible to cancel the force in the X-axis direction applied to the rotary shaft 100 and the rotary shaft 110. Similarly, in the power transmission between the rotor 11 and the rotor 12, the force in the X-axis direction applied to the rotating shaft 110 and the rotating shaft 120 can be offset. Note that, by canceling out the force acting in the axial direction, it is possible to reduce a load on a bearing or the like (not shown).

  Further, since the power transmission device 1 is a non-contact power transmission device using magnetic gears, transmission loss can be reduced as compared with a power transmission device using gears that are in direct and physical contact. it can. In particular, when the input rotational speed is an extremely high rotation (for example, 100000 rpm or more), it is preferable from the viewpoint of realizing high transmission efficiency.

  As described above, the power transmission device 1 according to the present embodiment can reduce transmission loss and achieve high reliability.

  Furthermore, in the power transmission device 1 according to the present embodiment, two small-diameter rotor disks 101 and 102 are arranged on both sides in the X-axis direction of one large-diameter rotor disk 111, and one large-diameter rotor disk. Since two small-diameter rotor disks 112 and 113 are arranged on both sides of 121 in the X-axis direction, the weight can be reduced. That is, since power is transmitted by a combination of one large-diameter rotor disk and two small-diameter rotor disks, a combination of one small-diameter rotor disk and two large-diameter rotor disks is assumed. Compared to the above, the total weight of the rotor disk can be reduced.

[Second Embodiment]
1. Overall Configuration The overall configuration of the power transmission device 2 according to the second embodiment of the present invention will be described with reference to FIG. In FIG. 6, only the members that are the main points are extracted and illustrated, and other members (for example, members such as bearings) are not illustrated. The description of the same configuration as in the first embodiment is omitted.

  As shown in FIG. 6, the power transmission device 2 also includes three rotors 20, 21, and 22. The rotor 20 includes a rotating shaft 200 extending in the X-axis direction and a rotor disk 201 fixed to the rotating shaft 200 and having a radial direction in a plane direction orthogonal to the X-axis direction. The rotor disk 201 also has a disk shape in plan view from the X-axis direction. The rotor 20 includes a plurality of magnets 202 disposed on the outer edge portion of one main surface 201a of the rotor disk 201 and a plurality of magnets 203 disposed on the outer edge portion of the other main surface 201b of the rotor disk 201. Have.

  The rotor 21 has a rotation shaft 210 that extends in the X-axis direction and is arranged at an interval in the Z-axis direction with respect to the rotation shaft 200 of the rotor 20. Three rotor disks 211, 212, and 213 having a radial direction in a plane direction orthogonal to the X-axis direction are fixed to the rotating shaft 210. These rotor disks 211, 212, and 213 also have a disk shape in plan view from the X-axis direction. The rotor disk 211 is fixed to the rotation axis 210 on the left side in the X-axis direction, and is disposed at a position adjacent to the left side with a space from the rotor disk 201 of the rotor 20 in the X-axis direction.

  The rotor disk 212 is fixed to the rotating shaft 210 at a position on the right side in the X-axis direction relative to the rotor disk 211, and is adjacent to the right side with a space from the rotor disk 201 of the rotor 20 in the X-axis direction. Placed in position. A part of the outer peripheral portion of the rotor disk 201 of the rotor 20 is arranged between the rotor disk 211 and the rotor disk 212 of the rotor 21.

  On the other hand, the rotor disk 213 is fixed at a position spaced from the rotor disk 212 to the right in the X-axis direction with respect to the rotation shaft 210.

  The rotor 21 has a plurality of magnets 214 disposed on the outer edge portion of the main surface 211a on the right side in the X-axis direction of the rotor disk 211 and the outer edge portion of the main surface 212a on the left side in the X-axis direction of the rotor disk 212. The plurality of magnets 215 and the plurality of magnets 216 disposed on the outer edge portion of the main surface 213aa on the left side in the X-axis direction of the rotor disk 213 and the outer edge portion of the main surface 213b on the right side in the X-axis direction of the rotor disk 213. A plurality of magnets 217.

  The rotor 22 extends in the X-axis direction, is spaced in the Z-axis direction with respect to the rotation shaft 210 of the rotor 21, and is disposed in the X-axis direction with respect to the rotation shaft 200 of the rotor 20. Have Rotor disks 221 and 222 are fixed to the rotary shaft 220, with the plane direction orthogonal to the X-axis direction being the radial direction and spaced apart from each other in the X-axis direction. The rotor disks 221 and 222 also have a disk shape in plan view from the X-axis direction. The rotor disk 221 is disposed at a position adjacent to the left side at a distance from the rotor disk 213 of the rotor 21 in the X-axis direction with respect to the rotation shaft 220. The rotor disk 222 is disposed at a position adjacent to the right side at a distance from the rotor disk 213 of the rotor 21 in the X-axis direction with respect to the rotation shaft 220.

  The rotor 22 has a plurality of magnets 223 arranged on the outer edge portion of the main surface 221a on the right side in the X-axis direction of the rotor disk 221, and the outer edge portion of the main surface 222a on the left side in the X-axis direction of the rotor disk 222. A plurality of magnets 224.

  Here, also in the present embodiment, for the plurality of magnets 202, 203, 214, 215, 216, 217, 223, and 224, the rotor disks 201, 211, 212, 213, 221, and 222 are moved from the X-axis direction. When viewed in plan, they are arranged in an annular shape (see FIG. 2).

Some of the plurality of magnets 202 disposed on the main surface 201a of the rotor disc 201 is in the area E ₁ enclosed by a two-dot chain line, for some of the plurality of magnets 214 disposed in the rotor disc 211, Opposite with an interval in the X-axis direction. Also, some of the plurality of magnets 203 disposed on the main surface 201b of the rotor disc 201 is in the region _{E 1,} for a part of the plurality of magnets 215 disposed in the rotor disc 212, interval in the X-axis direction Opposite with a gap.

Here, in the region E1, _one of the opposing magnets 202 and 214 is the S pole and the other is the N pole. Similarly, in the region E ₁ , _one of the opposing magnet 203 and magnet 215 is the S pole and the other is the N pole. One of the magnet 202 and the magnet 203 arranged back to back in the X-axis direction with the rotor disk 201 sandwiched in the thickness direction is an S pole and the other is an N pole.

Some of the plurality of magnets 223 disposed in the rotor disk 221, in the area E ₂ enclosed by a two-dot chain line, for some of the plurality of magnets 216 disposed on the main surface 213a of the rotor disc 213, Opposite with an interval in the X-axis direction. Similarly, a portion of the plurality of magnets 224 disposed in the rotor disc 222, in the area _{E 2,} with respect to some of the plurality of magnets 217 disposed on the main surface 213b of the rotor disk 213, in the X-axis direction Opposes at intervals.

Here, even in a region _{E 2,} magnet 223 and the magnet 216 opposite to it one of a S pole, and the other is N pole. Similarly, in the area _{E 2,} magnet 224 and the magnet 217 opposite to it one of a S pole, and the other is N pole. One of the magnets 216 and 217 arranged back to back in the X-axis direction with the rotor disk 213 sandwiched in the thickness direction is an S pole and the other is an N pole.

The power transmission device 2 also has the above-described configuration, so that a power transmission path PW ₂ is formed and functions as a non-contact type speed reducer using a magnetic gear. For example, when a rotational driving force is input to the rotor 20 (IN ₂ ), the rotor 21 is rotated at a low speed and increased in torque, and the power is transmitted to the rotor 22. Further, the rotor 22 is rotated at a low speed and increased in torque. And output (OUT ₂ ). Also in the power transmission device 2 according to the present embodiment, when the input and output of the rotational driving force are switched, the power transmission device 2 functions as a speed increaser.

2. Advantages Also in the power transmission device 2 according to the present embodiment, when the rotor 20 and the rotor 21 rotate, the magnet 202 of the rotor disk 201 and the magnet 214 of the rotor disk 211 facing each other and the magnet of the rotor disk 201 are attracted. 203 and the force with which the opposing magnets 215 of the rotor disk 212 attract each other act in the direction of canceling each other. Therefore, the power transmission device 2 can also cancel the force in the X-axis direction applied to the rotary shaft 200 and the rotary shaft 210. Similarly, in the power transmission between the rotor 21 and the rotor 22, the force in the X-axis direction applied to the rotating shaft 210 and the rotating shaft 220 can be offset. Note that, by canceling out the force acting in the axial direction, it is possible to reduce a load on a bearing or the like (not shown).

  Further, since the power transmission device 2 is also a non-contact power transmission device using magnetic gears, transmission loss can be reduced as compared with a power transmission device using gears that are in direct and physical contact. Can do.

  As described above, also in the power transmission device 2 according to the present embodiment, transmission loss can be reduced and high reliability can be realized.

[Third Embodiment]
1. Configuration The overall configuration of the power transmission device 3 according to the present embodiment will be described with reference to FIG. In FIG. 7, only the members that are the main points are extracted and illustrated, and other members (for example, members such as bearings) are not illustrated.

  As shown in FIG. 7, the power transmission device 3 includes four rotors 30, 31, 32, and 33. The rotor 30 includes a rotating shaft 300 extending in the X-axis direction, and two rotor disks 301 and 302 that are fixed to the rotating shaft 300 and have a radial direction in a plane direction orthogonal to the X-axis direction. These rotor disks 301 and 302 also have a disk shape in a plan view from the X-axis direction, as in the first and second embodiments.

  In addition, the rotor 30 has a plurality of magnets 303 disposed on the outer edge portion of the main surface 301a on the right side in the X-axis direction of the rotor disk 301 and the outer edge portion of the main surface 302a on the left side in the X-axis direction of the rotor disk 302. A plurality of magnets 304.

  The rotor 31 has a rotation shaft 310 that extends in the X-axis direction and is arranged at an interval in the Z-axis direction with respect to the rotation shaft 300 of the rotor 30. Three rotor disks 311, 312, and 313 are fixed to the rotating shaft 310 with the plane direction orthogonal to the X-axis direction as the radial direction. These rotor disks 311, 312, and 313 also have a disk shape in plan view from the X-axis direction. The rotor disk 311 is fixed to the rotation axis 310 on the left side in the X-axis direction, and is disposed at a position sandwiched between the rotor disk 301 and the rotor disk 302 of the rotor 30 in the X-axis direction.

  On the other hand, the rotor disk 312 is fixed at a position spaced from the rotor disk 311 to the right in the X-axis direction with respect to the rotating shaft 310, and the rotor disk 313 is further spaced from the rotor disk 312 to the right in the X-axis direction. It is fixed at the position.

  In addition, the rotor 31 includes a plurality of magnets 314 disposed on an outer edge portion of one main surface 311a of the rotor disk 311 and a plurality of magnets 315 disposed on an outer edge portion of the other main surface 311b of the rotor disk 311. And a plurality of magnets 316 disposed on the outer edge portion of the main surface 312a of the rotor disk 312 and a plurality of magnets 317 disposed on the outer edge portion of the main surface 313a of the rotor disk 313.

  The rotor 32 has a rotating shaft 320 that extends in the X-axis direction and is spaced from the rotating shaft 300 of the rotor 30 and the rotating shaft 310 of the rotor 31 in the Z-axis direction. Three rotor disks 321, 322, and 323 having a radial direction in a plane direction orthogonal to the X-axis direction are fixed to the rotating shaft 320. These rotor disks 321, 322 and 323 also have a disk shape in plan view from the X-axis direction. The rotor disk 321 is fixed to the rotation axis 320 on the left side in the X-axis direction, and is disposed at a position sandwiched between the rotor disk 301 and the rotor disk 302 of the rotor 30 in the X-axis direction. In order to realize this arrangement, in the power transmission device 3, the rotor disk 311 of the rotor 31 and the rotor disk 321 of the rotor 32 are arranged at substantially the same position in the X-axis direction.

  On the other hand, the rotor disk 322 is fixed at a position spaced from the rotor disk 321 to the right in the X-axis direction with respect to the rotating shaft 320, and the rotor disk 323 is further spaced from the rotor disk 322 to the right in the X-axis direction. It is fixed at the position.

  The rotor 32 includes a plurality of magnets 324 disposed on the outer edge portion of one main surface 321a of the rotor disk 321 and a plurality of magnets 325 disposed on the outer edge portion of the other main surface 321b of the rotor disk 321. And a plurality of magnets 326 disposed on the outer edge portion of the main surface 322a of the rotor disk 322 and a plurality of magnets 327 disposed on the outer edge portion of the main surface 323a of the rotor disk 323.

  The rotor 33 extends in the X-axis direction, and is spaced from the rotary shafts 310 and 320 between the rotary shaft 310 of the rotor 31 and the rotary shaft 320 of the rotor 32 in the Z-axis direction. On the other hand, it has the rotating shaft 330 arranged at intervals in the X-axis direction. A rotor disk 331 having a radial direction in a plane direction orthogonal to the X-axis direction is fixed to the rotation shaft 330. The rotor disk 331 also has a disk shape in plan view from the X-axis direction. The rotor disk 331 is sandwiched between the rotor disk 312 and the rotor disk 313 of the rotor 31 and between the rotor disk 322 and the rotor disk 323 of the rotor 32 in the X-axis direction with respect to the rotation shaft 320. Is arranged. In order to realize this arrangement, in the power transmission device 3, the rotor disk 312 of the rotor 31 and the rotor disk 322 of the rotor 33 are arranged at substantially the same position in the X-axis direction, and the rotor disk 313 and the rotor 32 of the rotor 31 are arranged. The rotor disk 323 is arranged at substantially the same position.

  Further, the rotor 33 is provided with a plurality of magnets 332 disposed on the outer edge portion of one main surface 331a of the rotor disk 331 and a plurality of magnets 333 disposed on the outer edge portion of the other main surface 331b of the rotor disk 331. Have.

  Here, with respect to the plurality of magnets 303, 304, 314, 315, 316, 317, 324, 325, 326, 327, 332, 333, the rotor disks 301, 302, 311, 312, 313, 321, 322, 323, respectively. , 331 are arranged in an annular shape when viewed in plan from the X-axis direction (FIG. 7 also shows only a part of the magnets in a simplified manner).

Some of the plurality of magnets 314 disposed on the main surface 311a of the rotor disc 311 is in the area F ₁ enclosed by a two-dot chain line, for some of the plurality of magnets 303 disposed in the rotor disk 301, Opposite with an interval in the X-axis direction. Also, some of the plurality of magnets 315 disposed on the main surface 311b of the rotor disc 311 is in the area _{F 1,} to a part of the plurality of magnets 304 disposed in the rotor disc 302, interval in the X-axis direction Opposite with a gap.

Here, in the region F ₁ , _one of the opposing magnets 314 and 303 is an S pole and the other is an N pole. Similarly, in the region F1, _one of the opposing magnets 315 and 304 is the S pole and the other is the N pole. One of the magnet 314 and the magnet 315 arranged back to back in the X-axis direction with the rotor disk 311 sandwiched in the thickness direction is an S pole and the other is an N pole.

Some of the plurality of magnets 324 disposed on the main surface 321a of the rotor disc 321 is in the area F ₂ enclosed by a two-dot chain line, for some of the plurality of magnets 303 disposed in the rotor disk 301, Opposite with an interval in the X-axis direction. Also, some of the plurality of magnets 325 disposed on the main surface 321b of the rotor disc 321 is in the area _{F 2,} with respect to some of the plurality of magnets 304 disposed in the rotor disc 302, interval in the X-axis direction Opposite with a gap.

Here, in the area _{F 2,} magnet 324 and the magnet 303 opposite to it one of a S pole, and the other is N pole. Similarly, in region _{F 2,} magnet 325 and the magnet 304 opposite to it one of a S pole, and the other is N pole. One of the magnets 324 and 325 arranged back to back in the X-axis direction with the rotor disk 321 sandwiched in the thickness direction is an S pole and the other is an N pole.

Some of the plurality of magnets 332 disposed in the rotor disc 331, in a region F ₃ enclosed by a two-dot chain line, for some of the plurality of magnets 316 disposed in the rotor disc 312, in the X-axis direction Opposes at intervals. Similarly, a portion of the plurality of magnets 333 disposed in the rotor disc 331, in the region F _3, with respect to some of the plurality of magnets 317 disposed in the rotor disc 313, spaced in the X-axis direction Opposite in state.

Here, also in the region F ₃ , one of the opposing magnets 332 and 316 is the S pole and the other is the N pole. Similarly, in region _{F 3,} the magnet 333 and the magnet 317 opposite to it one of a S pole, and the other is N pole. One of the magnet 332 and the magnet 333 arranged back to back in the X-axis direction with the rotor disk 331 sandwiched in the thickness direction is the S pole and the other is the N pole.

Also, some of the plurality of magnets 332 disposed in the rotor disk 331, in the region F ₄ enclosed by a two-dot chain line, for some of the plurality of magnets 326 disposed in the rotor disc 322, X-axis Opposite with a gap in the direction. Similarly, a portion of the plurality of magnets 333 disposed in the rotor disc 331, in the region F _4, for some of the plurality of magnets 327 disposed in the rotor disc 323, spaced in the X-axis direction Opposite in state.

Here, even in a region _{F 4,} the magnet 332 and the magnet 326 opposite to it one of a S pole, and the other is N pole. Similarly, in the area _{F 4,} the magnet 333 and the magnet 327 opposite to it one of a S pole, and the other is N pole.

Since the power transmission device 3 has the above-described configuration, the power transmission path PW ₃₀ is once divided into a power transmission path PW ₃₁ and a power transmission path PW ₃₂ , and is integrated into the power transmission path PW ₃₃ by the rotor 33. The power transmission device 3 according to the present embodiment also functions as a non-contact type speed reducer using a magnetic gear. For example, when a rotational driving force is input to the rotor 30 (IN ₃ ), the rotor 31 and the rotor 32 are rotated at a low speed and increased in torque, and the power is transmitted, and further, the rotor 33 is rotated at a low speed. -The torque is increased and output (OUT ₃ ).

  Note that the power transmission device 3 also functions as a speed increaser if the input and output of the rotational driving force are switched.

2. Superiority In the power transmission device 3 according to the present embodiment, the rotational driving force of the rotating shaft 300 of the rotor 30 is once executed in a state where it is divided into the rotating shaft 310 of the rotor 31 and the rotating shaft 320 of the rotor 32 ( It is divided into a power transmission path PW ₃₁ and a power transmission path PW ₃₂ ), and is again integrated by the rotating shaft 330 of the rotor 33 (integrated in the power transmission path PW ₃₃ ). Therefore, it has the same superiority as the first embodiment and is further superior to high torque transmission. Further, the arrangement of the rotor 31 and the rotor 32 with respect to the rotor 30 and the rotor 33 enables a symmetrical arrangement, and the generation of an undesired moment in the entire apparatus due to power transmission can also be suppressed.

  In the power transmission device 3, even when the input and output of the rotational driving force are switched and used as a speed increaser, the rotation of the rotating shaft 310 of the rotor 31 and the rotor 32 is temporarily performed in the middle of the power transmission path. The division into the axis 320 is the same. In this case, the same advantage as described above can be obtained.

[Consideration on the number of magnets arranged on a small-diameter rotor disk]
In the first embodiment, the second embodiment, and the third embodiment, the number of magnets arranged in the small-diameter rotor disks 101, 102, 112, 113, 201, 213, 301, 302, 312, 313, 322, and 323 is set. As an example, two S poles and two N poles, a total of four, that is, four poles are provided. As described above, it is possible to use 6 poles or 8 poles, but using 2 poles is not preferable for achieving high reliability. This will be described with reference to FIG.

  First, a case where a four-pole rotor disk is employed will be described.

As shown in FIG. 8A, when the small-diameter rotor disk RD ₂ is in a certain phase state, the N-pole magnet MG _N2 faces the S-pole magnet MG _S1 of the large-diameter rotor disk RD _{1 in} the direction perpendicular to the paper surface. . In this phase state, the N-pole magnet MG _N1 of the large-diameter rotor disk RD ₁ is not in opposition to the N-pole magnet MG _N2 of the small-diameter rotor disk RD ₂ .

When the small-diameter rotor disc RD ₂ to 45 ° rotated left, the large-diameter rotor disc RD ₁ is rotated in conjunction predetermined angle. FIG. 8B shows the state after rotation. As shown in FIG. 8B, in a state where the small-diameter rotor disk RD ₂ has been rotated by 45 °, an N-pole magnet MG _N2 and an S-pole magnet MG are provided in the middle portion in the region facing the large-diameter rotor disk RD _1. A boundary with _S2 exists. On the other hand, since the large-diameter rotor disk RD ₁ is also rotating in synchronization, the S-pole magnet MG _S1 of the large-diameter rotor disk RD ₁ faces the N-pole magnet MG _N2 of the small-diameter rotor disk RD ₂ . The N-pole magnet MG _N1 of the large-diameter rotor disk RD ₁ is opposed to the S-pole magnet MG _S2 of the small-diameter rotor disk RD ₂ .

As described above, when the small-diameter rotor disk RD ₂ has a four-pole configuration, the magnets MG _S2 and MG _N2 of the small-diameter rotor disk RD ₂ can be used in a wide area, and with the large-diameter rotor disk RD ₁ The area of the portion where the same poles of the magnets face each other can be reduced. Therefore, the negative force in the facing region can be reduced, which is suitable for large torque transmission.

  Next, a case where a two-pole rotor disk is employed will be described.

As shown in FIG. 8C, when the small-diameter rotor disk RD ₃ is in a predetermined phase state, the N-pole magnet MG _{N4 faces} the S-pole magnet MG _S3 of the large-diameter rotor disk RD _{3 in} the direction perpendicular to the paper surface. To do. In this phase state, the N-pole magnet MG _N3 of the large-diameter rotor disk RD ₃ is not in opposition to the N-pole magnet MG _N4 of the small-diameter rotor disk RD ₄ .

When the small-diameter rotor disk RD ₄ is rotated 45 degrees counterclockwise, the large-diameter rotor disk RD ₃ rotates in conjunction with a predetermined angle. FIG. 8D shows the state after rotation. As shown in FIG. 8D, when the small-diameter rotor disk RD ₄ has been rotated by 45 °, the N-pole magnets MG _N4 and S are located at the positions indicated by the broken lines in the region facing the large-diameter rotor disk RD _3. A boundary with the polar magnet MG _S4 exists. On the other hand, since the large-diameter rotor disk RD ₃ is also rotated by a predetermined angle, the N-pole magnet MG of the large-diameter rotor disk RD ₃ is compared with a part of the N-pole magnet MG _N4 of the small-diameter rotor disk RD _4. A part of _{N3 faces each} other. Thereby, in the area | region where a part of N-pole magnet MG _{N4 and} a part of N-pole magnet MG _N3 oppose, the force which mutually repels will work.

As described above, when the small-diameter rotor disk RD ₄ having the two-pole configuration is adopted, the attractive force and the repulsive force alternately act between the small-diameter rotor disk RD ₄ and the large-diameter rotor disk RD ₃ depending on the rotational phase. Will do. Therefore, it is not desirable for realizing high reliability.

Incidentally, FIG. 8 (a), the (b), the is adopted small rotor disc RD ₂ of 4 pole configuration, in 6 pole configuration and 8 pole configuration, it is possible to realize a high reliability.

[Fourth Embodiment]
The drive device 5 according to the fourth embodiment will be described with reference to FIG.

  As shown in FIG. 9, the drive device 5 according to the present embodiment includes the power transmission device 1 according to the first embodiment, a drive motor 51, a motor controller 52, and a rotation angle sensor 53. Among these, the power transmission device 1 is as described above, and a detailed description thereof is omitted here.

However, a rotation angle sensor 53 is attached to the rotation shaft 120 of the rotor 12 in the power transmission device 1, and a signal path S ₁ for sending a rotation angle signal to the motor controller 52 is provided. . The signal path S1 may be either a wired signal path or a wireless signal path.

A signal path S ₂ for sending a current control signal from the motor controller 52 to the drive motor 51 is provided between the drive motor 51 and the motor controller 52. For even signal path S _2, it may be either a wired signal path and a radio signal path.

  Here, as the drive motor 51, for example, a reluctance motor is employed.

  In driving the driving device 5, the rotation angle information from the rotation angle sensor attached to the rotation shaft 120 is fed back to the motor controller 52, and the motor controller 52 supplies the drive motor 51 with no out-of-step. Control the current signal.

  Since the drive device 5 according to the present embodiment includes the power transmission device 1 according to the first embodiment as it is, the above effect can be achieved. As the power transmission device, the power transmission device 2 according to the second embodiment or the power transmission device 3 according to the third embodiment may be employed. Further, the rotation angle sensor can be attached not only to the rotation shaft 120 of the rotor 12 but also to the rotation shaft 110 of the rotor 11 or to both of the rotation shafts 110 and 120. Moreover, it is good also as attaching to the rotating shaft 100 which is a drive shaft.

[Modification]
In the first embodiment and the second embodiment, each of the three rotors is included as a component, and in the third embodiment, the four rotors are included as a component. This is not a limitation. For example, a power transmission device including two rotors, a power transmission device including five or more rotors, and the like can be used.

  Moreover, in the said 3rd Embodiment, although the structure which divides a power transmission path into 2 was employ | adopted, this invention is not limited to this. It can be divided into three or more power transmission paths. In the third embodiment, the divided power transmission paths are finally integrated into one power transmission path, but it is not always necessary to finally integrate them into one power transmission path. That is, you may decide to employ | adopt the structure of the output extraction of two systems.

  In the first to third embodiments, one rotor disk 111, 121, 201, 213, 311, 321, 331 is replaced with two rotor disks 101, 102, 112, 113, 211, 212. , 221, 222, 301, 302, 312, 313, 322, 323, but the present invention is not limited to this. For example, two rotor disks may be provided in the first rotor, and three rotor disks may be provided in the corresponding second rotor. In this case, the rotor disk of the second rotor can be inserted between the two rotor disks of the first rotor. The two rotor disks of the first rotor are each provided with a plurality of magnets on both main surfaces. In addition, a plurality of magnets are arranged on the opposite main surface side of the two rotor disks on the end side of the second rotor, and a plurality of magnets are arranged on both main surfaces of the rotor disk arranged therebetween. . Thereby, it is possible to cope with the case where higher torque power transmission is required. The number of rotor disks to be combined can be further increased.

  In the first embodiment, as an example, the large-diameter rotor disks 111 and 121 have 40 poles and the small-diameter rotor disks 101, 102, 112, and 113 have 4 poles, but the present invention is not limited to this. Not receive. The number of magnet poles arranged on the large-diameter rotor disk and the number of magnet poles arranged on the small-diameter rotor disk can be appropriately changed depending on the reduction ratio (speed increase ratio).

  In the fourth embodiment, the reluctance motor is employed as an example of the drive source. However, the present invention is not limited to this. For example, a DC motor, an induction motor, a permanent magnet type motive motor (embedded magnet type, surface magnet type), a switched reluctance motor, a synchronous reluctance motor, or the like may be employed. In addition to the electric motor, an internal combustion engine such as a gasoline engine or a diesel engine can be employed as the drive source. Further, a pneumatic or hydraulic rotary actuator can be employed.

1, 2, 3 Power transmission device 5 Drive device 10-12, 20-22, 30-33 Rotor 51 Drive motor 52 Motor controller 53 Rotation angle sensor 100, 110, 120, 200, 210, 220, 300, 310, 320, 330 Rotating shaft 101-102.111-113, 121, 201, 211-213, 221-222, 301-302, 311-313, 321-323, 331 Rotor disk 103-104, 114-117, 122- 123, 202-203, 214-217, 223-224, 303-304, 314-317, 324-327, 332-333 Magnet

Claims (9)

A power transmission device comprising a first rotor and a second rotor,
The first rotor is
A first rotating shaft extending in a first direction;
A first rotor disk fixed to the first rotating shaft and having a second direction perpendicular to the first direction as a radial direction;
A plurality of first magnets arranged in an annular shape in plan view on an outer edge portion of one main surface of the first rotor disk and an outer edge portion of the other main surface of the first rotor disk;
Have
The second rotor is
A second rotating shaft that extends in the first direction and is spaced from the first rotating shaft in the second direction; and
A second rotor disk fixed to the second rotating shaft, having the second direction as a radial direction, and being spaced apart from the first rotor disk in the first direction;
The first rotor disk is fixed to the second rotating shaft, the second direction is a radial direction, and the first rotor disk is disposed on the opposite side of the first rotor disk in the first direction. A third rotor disk arranged at intervals in the first direction;
A plurality of second magnets arranged in an annular shape in plan view on the outer edge portion of the main surface of the second rotor disk on the first rotor disk side in the first direction;
A plurality of third magnets arranged in an annular shape in plan view on an outer edge portion of the main surface of the third rotor disk on the first rotor disk side in the first direction;
Have
A part of the plurality of first magnets, a part of the plurality of second magnets, and a part of the plurality of third magnets are opposed to each other with a space therebetween,
The first rotor and the second rotor are interlocked in a synchronized state with magnetic forces of the plurality of first magnets, the plurality of second magnets, and the plurality of third magnets. apparatus. In a region where a part of the plurality of first magnets, a part of the plurality of second magnets, and a part of the plurality of third magnets face each other with a space therebetween,
One of the first and second magnets facing each other is an S pole and the other is an N pole,
One of the first and third magnets facing each other is an S pole and the other is an N pole,
The two first magnets arranged back to back in the first direction with the first rotor disk sandwiched in the thickness direction, one of which is an S pole and the other is an N pole. The power transmission device according to claim 1. The power transmission device according to claim 2, wherein the second rotor disk, the third rotor disk, and the second rotating shaft are made of a magnetic material. Wherein a portion of the plurality of first magnet, in a region where a portion is opposite said plurality of second third magnet portion of the magnet and the plurality of magnets facing area and S _1, S _2,
Internal magnetic path areas in the second rotor disk and the third rotor disk are S ₃ and S ₄ ,
The cross-sectional area in the second direction of the second rotation axis when the S _5,
Against S ₁ and _{S 2, S 3} and _{S 4} and _{S 5,} the power transmission device according to claim 3, wherein the at least equivalent. In the case of a plan view of the first rotor disk, the pitch circle diameter of the arrangement of the plurality of first magnet and D _1,
In the case of a plan view of the second rotor disk, the pitch circle diameter of the arrangement of the plurality of second magnets and D _2,
In the case of a plan view of the third rotor disk, the pitch circle diameter of the arrangement of the plurality of third magnets when the D _3,
D ₂ and relative to D _3, D ₁ is larger power transmission apparatus as set forth in any one of claims 1 to features of claim 4. Each of the plurality of second magnets disposed on the second rotor disk and the plurality of third magnets disposed on the third rotor disk is any one of four poles, six poles, and eight poles. The power transmission device according to claim 5. The plurality of first magnets, the plurality of second magnets, and the plurality of third magnets are each a polar anisotropic magnet. Power transmission device. Furthermore, a third rotor and a fourth rotor are provided,
The third rotor is
A third rotating shaft that extends in the first direction and is spaced from the first rotating shaft and the second rotating shaft in the second direction;
A fourth rotor disk fixed to the third rotating shaft, having the second direction as a radial direction, and disposed between the second rotor disk and the third rotor disk in the first direction;
A fifth rotor disk fixed to the third rotating shaft, having the second direction as a radial direction, and being spaced apart from the fourth rotor disk in the first direction;
The fifth rotor disk is fixed to the third rotating shaft, the second direction is a radial direction, and the fifth rotor disk is opposite to the fourth rotor disk across the fifth rotor disk in the first direction. A sixth rotor disk arranged at an interval in the first direction;
A plurality of fourth magnets arranged in an annular shape in plan view on the outer edge portion of one main surface of the fourth rotor disk and the outer edge portion of the other main surface of the fourth rotor disk;
A plurality of fifth magnets arranged in an annular shape in plan view on the outer edge portion of the main surface of the fifth rotor disk on the side of the sixth rotor disk in the first direction;
A plurality of sixth magnets arranged in an annular shape in plan view on the outer edge portion of the main surface of the sixth rotor disk on the side of the fifth rotor disk in the first direction;
Have
The fourth rotor is
A fourth rotating shaft that extends in the first direction and is spaced from the first rotating shaft and the third rotating shaft in the second direction;
A seventh rotor disk fixed to the fourth rotation shaft, having the second direction as a radial direction, and disposed between the fifth rotor disk and the sixth rotor disk in the first direction;
A plurality of seventh magnets arranged in an annular shape in plan view on the outer edge of one main surface of the seventh rotor disk and the outer edge of the other main surface of the seventh rotor disk;
Have
The first rotor further includes:
An eighth rotor disk fixed to the first rotating shaft, having the second direction as a radial direction, and being spaced apart from the first rotor disk in the first direction;
The eighth rotor disk is fixed to the first rotating shaft, has the second direction as a radial direction, and is opposite to the eighth rotor disk across the seventh rotor disk in the first direction. A ninth rotor disk arranged at intervals in the first direction;
A plurality of eighth magnets arranged in an annular shape in plan view on the outer edge of the main surface of the eighth rotor disk on the seventh rotor disk side in the first direction;
A plurality of ninth magnets arranged in an annular shape in plan view on the outer edge of the main surface of the ninth rotor disk on the seventh rotor disk side in the first direction;
Have
A part of the plurality of fourth magnets, a part of the plurality of second magnets, and a part of the plurality of third magnets are opposed to each other with a space therebetween,
A part of the plurality of seventh magnets, a part of the plurality of fifth magnets and a part of the plurality of sixth magnets are opposed to each other with a space therebetween,
A part of the plurality of seventh magnets, a part of the plurality of eighth magnets, and a part of the plurality of ninth magnets are opposed to each other with a space therebetween,
The second rotor and the third rotor are interlocked in a synchronized state with magnetic forces of the plurality of fourth magnets, the plurality of second magnets, and the plurality of third magnets,
The fourth rotor, the first rotor, and the third rotor include the plurality of seventh magnets, the plurality of fifth magnets, the plurality of sixth magnets, the plurality of eighth magnets, and the plurality of first magnets. Interlocked with the magnetic force of 9 magnets,
One rotational driving force of the second rotating shaft and the fourth rotating shaft is divided into the first rotating shaft and the third rotating shaft and integrated with the other of the second rotating shaft and the fourth rotating shaft. The power transmission device according to claim 1, wherein the power transmission device is transmitted. A drive source that generates rotational driving force;
A power transmission device for transmitting the rotational driving force from the driving source;
With
A drive device comprising the power transmission device according to any one of claims 1 to 8 as the power transmission device.

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