Power transmission device

Abstract

The power transmission device (100) includes: a motor (2) having a stator (21) and a rotor (22) configured to rotate relative to the stator (21); and a magnetic gear device (1) that directly transmits the driving force of the motor (2). The magnetic gear device (1) includes at least: a first magnet (11) having a plurality of first magnetic poles (111) arranged circumferentially (C); a second magnet (12) having a plurality of second magnetic poles (121) arranged circumferentially (C); and a pole piece (13) located between the first magnet (11) and the second magnet (12), magnetically connecting the first magnet (11) and the second magnet (12). At least one of the first magnet (11) and the second magnet (12) is annular, and the magnetic gear device (1) is a high-harmonic type magnetic gear device.

Description

Technical Field

[0001] This invention relates to a power transmission device. Background Technology

[0002] A known magnetic gear device comprises: an inner magnet, wherein a plurality of magnets are arranged circumferentially; and an outer magnet, wherein a plurality of magnets are arranged circumferentially, and the outer magnet is arranged radially outside the inner magnet (for example, see Patent Document 1).

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2022-150601 Summary of the Invention

[0004] The problem that the invention aims to solve However, in the technology described in Patent Document 1, there is room for improvement regarding the simplification of the structure.

[0005] The present invention was made in view of the above circumstances, and its object is to provide a power transmission device that simplifies the structure.

[0006] Solution for solving the problem To solve the aforementioned problems and achieve the objective, the power transmission device of the present invention comprises: a motor having a stator and a rotor configured to rotate relative to the stator; and a magnetic gear device that directly transmits the driving force of the motor. The magnetic gear device comprises at least: a first magnet having a plurality of first magnetic poles arranged circumferentially; a second magnet having a plurality of second magnetic poles arranged circumferentially; and pole pieces located between the first magnet and the second magnet, magnetically connecting the first magnet and the second magnet. At least one of the first magnet and the second magnet is annular, and the magnetic gear device is a high-harmonic type magnetic gear device.

[0007] According to one embodiment of the power transmission device of the present invention, the structure can be simplified. Attached Figure Description

[0008] Figure 1 This is a top view of the power transmission device with a magnetic gear device according to the first embodiment.

[0009] Figure 2 It means Figure 1 A perspective view of the magnetic gear device shown.

[0010] Figure 3 yes Figure 1 A cross-sectional view of the magnetic gear device shown.

[0011] Figure 4This is a top view of the power transmission device of the magnetic gear device of the first variant of the first embodiment.

[0012] Figure 5 This is a perspective view of the magnetic gear device of the second variation of the first embodiment.

[0013] Figure 6 This is a cross-sectional view of the power transmission device of the magnetic gear device of the third variation of the first embodiment.

[0014] Figure 7-1 yes Figure 6 A perspective view of the magnetic gear device shown.

[0015] Figure 7-2 yes Figure 6 A top view of the second magnetic gear mechanism of the magnetic gear device shown.

[0016] Figure 8 This is a cross-sectional view of the power transmission device of the magnetic gear device of the fourth variation of the first embodiment.

[0017] Figure 9-1 yes Figure 8 A perspective view of the magnetic gear device shown.

[0018] Figure 9-2 It means Figure 8 A cross-sectional view of the magnetic gear device shown on the other side of the axial direction.

[0019] Figure 10 This is a top view of the power transmission device 100E of the magnetic gear device of the fifth modified embodiment of the first embodiment.

[0020] Figure 11 yes Figure 10 A perspective view of the magnetic gear device shown.

[0021] Figure 12 This is a top view of the power transmission device of the magnetic gear device of the sixth variation of the first embodiment.

[0022] Figure 13 yes Figure 12 A perspective view of the magnetic gear device shown.

[0023] Figure 14 This is a top view of the power transmission device with a magnetic gear device according to the second embodiment.

[0024] Figure 15 This is a top view of the power transmission device with a magnetic gear device according to the third embodiment.

[0025] Figure 16This is a top view of the power transmission device with a magnetic gear device according to the fourth embodiment.

[0026] Figure 17 This is a top view of the power transmission device with a magnetic gear device according to the fifth embodiment.

[0027] Figure 18 This is a top view of the power transmission device with a magnetic gear device according to the sixth embodiment. Detailed Implementation

[0028] The power transmission device according to the embodiments will now be described in detail based on the accompanying drawings. It should be noted that the dimensional relationships and proportions of the elements in the drawings may sometimes differ from reality. The drawings may also contain portions with different dimensional relationships and proportions.

[0029] [First Implementation] Figure 1 This is a top view of the power transmission device 100 of the magnetic gear device 1 according to the first embodiment. Figure 2 It means Figure 1 A perspective view of the magnetic gear device 1 shown. Figure 3 yes Figure 1 The diagram shows a cross-sectional view of the magnetic gear device 1. It should be noted that, for ease of explanation, [the diagram is incomplete]. Figure 2 Motor 2 is omitted in the text.

[0030] In the presence of implementation methods Figure 1 , Figure 2 , Figure 3 In the description of the power transmission device 100 of the magnetic gear device 1 shown, for ease of understanding of direction, the direction is... Figure 1 The direction orthogonal to the plane of the paper is called the axial direction A, the direction of rotation of the first magnet 11 and the second magnet 12 is called the circumferential direction C, and the direction included in the plane orthogonal to the axial direction A, passing through the axis 2o of the stator 21 and orthogonal to the circumferential direction C is called the radial direction R.

[0031] Implementation methods Figure 1 , Figure 2 , Figure 3 The power transmission device (gearbox) 100 shown is a device that transmits the driving force of the motor 2 to the outside. The power transmission device 100 includes, for example, a magnetic gear device 1 and a motor 2.

[0032] The power transmission device 100 of the first embodiment, for example, increases and outputs the torque of the rotor 22 in the motor 2, which is the input, on the output shaft (not shown). The power transmission device 100 is, for example, housed in a frame (not shown).

[0033] Motor 2, for example, includes a stator 21 and a rotor 22, which is configured to rotate circumferentially C relative to the stator. Motor 2 is an electric motor that converts electrical energy supplied from a power source into mechanical energy (energy that causes the rotor 22 to rotate circumferentially C). It should be noted that the motor 2 in this embodiment is an outer rotor type with the rotor 22 arranged on the outer side of the stator 21 in the radial direction R.

[0034] The stator 21 is the part that generates the force for rotating the rotor 22 in the circumferential direction C. The stator 21 includes: a magnetic yoke 211, which is formed in a ring shape; teeth 212, which protrude from the inner circumference of the magnetic yoke 211 toward the inner side of the radial direction R; a coil 213, which is wound around the teeth 212; and an insulator 214, which electrically insulates the teeth 212 from the coil 213.

[0035] In the stator 21 of this embodiment, the magnetic yoke 211 and the teeth 212 are formed, for example, by punching out flat plate-shaped components made of magnetic materials (magnetic bodies) such as electromagnet steel plates, and stacking multiple components along the axial direction A. That is, the magnetic yoke 211 and the teeth 212 are formed of magnetic materials (magnetic bodies).

[0036] The coil 213 is electrically connected to a power source, for example. Moreover, when the motor 2 is driven, by applying a voltage to the coil 213 from the power source, a magnetic field that changes over time is formed in the coil 213. Through the interaction of this magnetic field with the magnetic force of the rotor magnet 221, the rotor 22 rotates circumferentially C relative to the stator 21.

[0037] Next, the rotor 22 will be described. The rotor 22 is arranged rotatably relative to the stator 21 on the outer side of the radial direction R. The rotor 4 has a plurality of (three in this embodiment) rotor magnets 221. The rotor magnets 221 are, for example, ring-shaped and integrally formed with a plurality of magnetic poles (six in this embodiment). Furthermore, the rotor magnets 221 are fixed to the inner circumferential surface of the second back yoke 122 of the second magnet 12 and rotate together with the second magnet 12 and the second back yoke 122. That is, in the power transmission device 100 of this embodiment, the magnetic gear device 1 and the motor 2 are integrated.

[0038] When driving a motor 2 with the above-described configuration, the rotor 22 rotates circumferentially C relative to the stator 21 about the axis 2o.

[0039] The magnetic gear device 1 includes a first magnet 11, a second magnet 12, a first pole piece 13, and a second shaft 17. The magnetic gear device 1 of this embodiment is a so-called flux modulation type magnetic gear (high harmonic type magnetic gear device): when the second magnet 12 connected to the driving side rotates around the axis 2o, the first pole piece 13 modulates the change in magnetic flux of the plurality of second magnetic poles 121 and transmits it to the first magnetic pole 111 of the first magnet 11 connected to the driven side, causing the first magnet 11 to rotate around the axis 2o. Furthermore, in the magnetic gear device 1 of this embodiment, the first magnet 11, the second magnet 12, and the first pole piece 13 are formed separately. It should be noted that, for the first space S1, in the case of a vacuum state, or in the presence of fluids such as air, water, or oil, as long as rotation of the first magnet 11 and the pole piece 13 is permitted, a non-magnetic material such as a resinous sliding material can also be filled.

[0040] The first magnet 11 is configured to rotate about an axis 2o relative to the frame and the first pole piece 13. The first magnet 11 has a plurality (e.g., 52) of first magnetic poles 111 arranged circumferentially C, and the plurality of first magnetic poles 111 are ring-shaped and integrally formed. The first magnet 11 is configured to rotate about an axis 2o relative to the frame and the first pole piece 13. Furthermore, a first space S1 is formed between the first magnet 11 and the first pole piece 13 in the radial direction R. In other words, the first magnet 11 is configured to rotate about an axis 2o without contacting the first pole piece 13.

[0041] Multiple first magnetic poles 111 are arranged in an alternating N and S configuration along the circumferential direction C. Furthermore, the first magnet 11 forms the multiple first magnetic poles 111 by magnetizing a magnetic body as described later. For example, the first magnet 11 has 52 first magnetic poles 111, therefore, the number of pole pairs of the first magnet 11 is 14.

[0042] The number of first magnetic poles 111 in the first magnet 11 is greater than the number of second magnetic poles 121 in the second magnet 12. Furthermore, a first back yoke 112 is provided in the first magnet 11, for example, on the inner side in the radial direction R. In the magnetic gear device 1 of this embodiment, the first magnet 11 and the second magnet 12 are configured to rotate around a common axis 2o.

[0043] Here, as Figure 1 , Figure 2 , Figure 3As shown, the first magnet 11 is formed in a ring shape, having a lower side surface 11a and an upper side surface 11b. Furthermore, the first magnet 11 has a through hole 11c and an outer peripheral surface 11d. The first magnet 11 is a rare-earth ferromagnet. In this embodiment, for example, it is formed by mixing magnetic powder containing neodymium (Nd-Fe-B), which is an isotropic rare-earth ferromagnet, with a thermosetting resin such as epoxy resin in a predetermined ratio.

[0044] The rare-earth ferromagnet used as the material of the first magnet 11 before magnetization is preferably an anisotropic rare-earth ferromagnet with an average crystal grain size of 10 nm or more and 10,000 nm or less, and more preferably an anisotropic rare-earth ferromagnet with an average crystal grain size of 10 nm or more and 6,600 nm or less.

[0045] By heating the rare-earth ferromagnetic magnet from below the Curie point to above the Curie point, maintaining it in a state where a magnetizing magnetic field is applied by the excitation unit, and then cooling it from above the Curie point to below the Curie point, the magnetized object is magnetized, thereby forming the first magnet 11.

[0046] Furthermore, in line with the miniaturization and high resolution of the equipment used (e.g., magnetic encoders), when the permanent magnet used as the magnetized object is composed of rare-earth magnets with high magnetic properties (e.g., Nd bonded magnets), a larger current needs to be flowed in the existing coil energizing method that carries pulse current, which would lead to the large size and high cost of the magnetizing device. In contrast, by heating the magnetized object using a heating section, the magnetic powder constituting the magnetized object is cooled from a temperature above the Curie point to a temperature below the Curie point, and during this period, a magnetic field is continuously generated by the permanent magnet in the excitation section to perform multipole magnetization, thereby forming the first magnet 11 shown in this embodiment from the magnetized object (for example, see Japanese Patent Application Laid-Open No. 2021-93521).

[0047] The uniformity of magnetization characteristics of the magnetized object can be achieved by forming the first magnet 11 in this way. Furthermore, by forming the first magnet 11 as described above, the pole distance of the plurality of first magnetic poles 111 in the circumferential direction C can be narrowed (for example, to 3 mm or less in the circumferential direction C). It should be noted that the pole distance of the first magnetic poles 111 is measured at the outer periphery of the first magnet 11.

[0048] The second magnet 12 is configured to rotate about an axis 2o relative to the frame and the first pole piece 13. Furthermore, a second space S2 is formed between the second magnet 12 and the first pole piece 13 in the radial direction R. In other words, the second magnet 12 is configured to rotate about an axis 2o without contacting the first pole piece 13. The second magnet 12 is formed in the same manner as the first magnet 11. That is, the second magnet 12 has a plurality of (6) second magnetic poles 121 arranged along the circumferential direction C, and the plurality of second magnetic poles 121 are ring-shaped and integrally formed. Furthermore, the plurality of second magnetic poles 121 are arranged in an alternating N and S pole configuration in the circumferential direction C. For example, the second magnet 12 has 6 second magnetic poles 121, therefore, the number of pole pairs of the second magnet 12 is 3. In addition, a second back yoke 122 is provided, for example, on the outer side of the second magnet 12 in the radial direction R. It should be noted that, for the second space S2, in the case of a vacuum state, or in the presence of fluids such as air, water, or oil, as long as the rotation of the second magnet 12 and the first pole piece 13 is allowed, it can also be filled with non-magnetic materials such as resin-based sliding materials.

[0049] The first pole piece 13 is composed of a plurality of (e.g., 29) first modulation pieces 131, which modulate the magnetic flux of the magnets 11 and 12. The first pole piece 13 is located radially between the first magnet 11 and the second magnet 12, magnetically connecting the first magnet 11 and the second magnet 12. The first modulation pieces 131 are formed of magnetic materials, for example, and are arranged at equal intervals along the circumferential direction C, and are fixed to a frame (not shown).

[0050] In the magnetic gear device 1 of this embodiment, the number of pole pairs 11M of the first magnet 11 is 26, the number of pole pairs 12M of the second magnet 12 is 3, and the number of modulation plates 131 of the first pole piece 13 is 29. Therefore, with the second magnet 12 on the inner side of the radial R as the input, the first magnet 11 on the outer side of the radial R as the output, and the first pole piece 13 fixed, the reduction ratio X1 can be calculated as follows.

[0051] X1 = 11M ÷ 12M = 26 ÷ 3 = 8.67 Alternatively, with the second magnet 12 as the input, the first pole piece 13 as the output, the first magnet 11 fixed, and the second magnet 12 positioned on the input side, the reduction ratio X2 can be calculated as follows.

[0052] X2 = 13M ÷ 12M = 29 ÷ 3 = 9.67 In the power transmission device 100 of this embodiment, when the drive motor 2 is used, the rotor 22 rotates about the axis 2o relative to the stator 21. With this rotation, the second back yoke 122 and the second magnet 12, fixed to the rotor 22, rotate together with the rotor 22 in the circumferential direction C. Furthermore, the change in magnetic flux of the second magnetic pole 121 in the second magnet 12 is modulated by the first pole piece 13 and transmitted to the first magnetic pole 111 of the first magnet 11 connected to the driven side. At this time, in the magnetic gear device 1 of this embodiment, the number of first magnetic poles 111 of the first magnet 11 disposed on the outer side of the second magnet 12 in the radial direction R is greater than the number of second magnetic poles 121 of the second magnet 12. Therefore, although the rotational speed in the circumferential direction C is reduced, the torque is increased. Furthermore, in the magnetic gear device 1 of this embodiment, the first magnet 11 is provided with a plurality of first magnetic poles 111 arranged in the circumferential direction C, and the plurality of first magnetic poles 111 are integrally formed in a ring shape. Therefore, for example, compared to a magnetic gear device having a first magnet in the shape of a ring formed by connecting multiple individually formed magnets (for example, the device described in Japanese Patent Application Publication No. 2022-150601), the magnetic gear device 1 of this embodiment can narrow the pole pitch of the multiple first magnetic poles 111 on the circumferential C, thereby increasing the torque.

[0053] An output shaft (not shown) is, for example, located radially R outside the first back yoke 112 in the first magnet 11. The torque of the first magnet 11 is output to the outside via a drive transmission mechanism (not shown). The drive transmission mechanism is, for example, composed of a worm and a worm wheel.

[0054] In the magnetic gear device 1 of this embodiment, the first magnet 11 is not in contact with the first pole piece 13 in the radial direction R, and the first pole piece 13 is not in contact with the second magnet 12 in the radial direction R. Furthermore, in the magnetic gear device 1, the first pole piece 13 is disposed between the first magnet 11 and the second magnet 12 in the radial direction R, and the first magnet 11 and the second magnet 12 are magnetically connected by the first pole piece 13. Therefore, when a torque exceeding the maximum transmission torque set according to the magnetic force of the second magnetic pole 121 and the gap between the second magnet 12 and the first pole piece 13 in the radial direction R is applied to the magnetic gear device 1, the magnetic gear device 1 functions as a torque limiter, stopping the rotation of the first magnet 11 in the circumferential direction C even when the second magnet 12 is rotating in the circumferential direction C. Therefore, the magnetic gear device 1 of this embodiment can protect the motor 2 by disconnecting the driving side and the driven side in case of overload. Alternatively, in the event that the motor 2 generates undesirable torque, the magnetic gear device 1 functions as a torque limiter, protecting the load side by disconnecting the drive side and the driven side. Furthermore, when the magnetic gear device 1 is used in the electric opening and closing mechanism of household appliances, it can cut off the torque from the drive side when a component on the load side comes into contact with a human body, thus also serving as a safety device that minimizes the impact on the human body.

[0055] As described above, the power transmission device 100 of this embodiment includes: a motor 2 having a stator 21 and a rotor 22 rotatable relative to the stator 21; and a magnetic gear device 1 that directly transmits the driving force of the motor 2. The magnetic gear device 1 includes at least: a first magnet 11 having a plurality of first magnetic poles 111 arranged along the circumferential direction C; a second magnet 12 having a plurality of second magnetic poles 121 arranged along the circumferential direction C; and a pole piece 13 located between the first magnet 11 and the second magnet 12, magnetically connecting the first magnet 11 and the second magnet 12. At least one of the first magnet and the second magnet is ring-shaped, and the magnetic gear device 1 is a high-harmonic type magnetic gear device. Therefore, it is not necessary to form a ring-shaped magnet by connecting multiple magnets, thus simplifying the structure. Furthermore, the power transmission device 100 includes: a motor 2 serving as an input-side device; and a magnetic gear device 1 that directly transmits the driving force of the motor 2, and the magnetic gear device 1 is of the high-harmonic type. More specifically, the magnetic gear device 1 is a high-harmonic type magnetic gear device in which one of the annular first magnet 11 and the annular second magnet 12 is arranged on the outer side of the radial direction R, and the other is arranged on the inner side of the radial direction R. The first magnetic poles 111 of the plurality of first magnets 11 and the second magnetic poles 121 of the plurality of second magnets 12 are magnetically connected in the radial direction R with the first pole piece 13 in between. Therefore, compared with a magnetic gear device in which the first magnet and the second magnet are arranged in such a way that a part of the outer peripheral surface of the annular first magnet and a part of the outer peripheral surface of the annular second magnet overlap in the axial direction (for example, Japanese Patent Application Laid-Open No. 2011-196451), the magnetic gear device 1 of this embodiment can magnetically connect the first magnetic poles 111 and the second magnetic poles 121 around the entire circumference of the shaft 2o, thereby increasing the torque density and increasing the torque.

[0056] Furthermore, the magnetic gear device 1 of this embodiment includes: an annular first magnet 11, with a plurality of first magnetic poles 111 arranged along the circumferential direction C, and the plurality of first magnetic poles 111 being integrally formed; an annular second magnet 12, with a plurality of second magnetic poles 121 arranged along the circumferential direction C; and a first pole piece 13 located between the first magnet 11 and the second magnet 12, magnetically connecting the first magnet 11 and the second magnet 12.

[0057] Furthermore, the power transmission device 100 of this embodiment can be configured by mounting a magnetic gear device 1 on the outer peripheral surface of the rotor magnet 221 in the radial direction, so the magnetic gear device 1 can be easily added to the motor 2.

[0058] Furthermore, the rotor magnet 221 of this embodiment, like the first magnet 11, is formed into a ring shape and integrally formed by magnetizing the magnetic body. Therefore, for example, compared to a motor having a ring-shaped rotor magnet formed by connecting multiple separately formed magnets, the rotor 22 of this embodiment can be made easier to manufacture by reducing assembly work.

[0059] Furthermore, in the magnetic gear device 1 of this embodiment, a plurality of first magnetic poles 111 are integrally formed on the first magnet 11. Therefore, compared with a magnetic gear device having a first magnet formed by connecting separately formed magnets in the circumferential direction C, miniaturization and weight reduction can be achieved. Moreover, since the magnetic gear device 1 has a first magnet 11 with the above-described configuration, not only can the number of components be reduced, but the shape of the back yoke 112 and / or frame can be simplified, and there is no need to provide a cover to prevent the first magnetic poles 111 from falling off. Furthermore, in the first magnet 11, the pole pitch in the circumferential direction C of the plurality of first magnetic poles 111 is narrower, thus reducing torque pulsation. Moreover, in the magnetic gear device 1 of this embodiment, the number of first magnetic poles 111 of the first magnet 11 is greater than the number of second magnetic poles 121 of the second magnet 12, therefore, compared with the torque of the rotor 22 in the motor 2 (input-side torque), the torque of the output shaft of the first magnet 11 connected to the magnetic gear device 1 can be increased (output-side torque). Furthermore, in the magnetic gear device 1 of this embodiment, the first magnet 11 is not in contact with the first pole piece 13 in the radial direction R, and the first pole piece 13 is not in contact with the second magnet 12 in the radial direction R. Therefore, the noise generated during operation can be reduced, dust generation due to use can be prevented, and lubricating oil is not required. Moreover, the magnetic gear device 1 does not generate dust during use and does not require lubricating oil for use, thus requiring no maintenance.

[0060] The magnetic gear device 1 of this embodiment has the aforementioned functions / effects, and therefore, for example, can be applied to devices used in clean rooms where dust is avoided, devices used in special environments such as marine or aerospace applications, residential equipment and home appliances requiring safety measures in case of contact with the human body and countermeasures against overload, and generators that operate at high efficiency. More specifically, the magnetic gear device 1 can be applied to robotic arms, semiconductor manufacturing equipment, electric opening and closing mechanisms of home appliances, electronic locks, cooling pumps and cooling fans for air conditioners, etc.

[0061] In the magnetic gear device 1 of this embodiment, the plurality of first magnetic poles 111 of the first magnet 11 are integrally formed in a ring shape, and the plurality of second magnetic poles 121 of the second magnet are integrally formed in a ring shape. Therefore, compared with a magnetic gear device having a first magnet and a second magnet formed by connecting separately formed magnets in the circumferential direction C, miniaturization and weight reduction can be achieved.

[0062] In the power transmission device 100 of this embodiment, a plurality of second magnetic poles 121 are integrally formed on the second magnet 12. Therefore, compared with a magnetic gear device having a second magnet formed by connecting separately formed magnets in the circumferential direction C, miniaturization and weight reduction can be achieved.

[0063] In the power transmission device 100 of this embodiment, the first pole piece 13 is located in the radial direction R between the first magnet 11 and the second magnet 12.

[0064] In the power transmission device 100 of this embodiment, the second magnet 12 is disposed inside the radial direction R of the first magnet 11. Furthermore, the motor 2, serving as an input device, is disposed inside the radial direction R of the second magnet 12. Moreover, the output shaft is disposed outside the radial direction R of the first magnet 11.

[0065] It should be noted that in the magnetic gear device 1 of the above embodiment, the case where the first pole piece 13 is fixed, the first magnet 11 disposed on the outer side of the radial direction R is not fixed, and the second magnet 12 disposed on the inner side of the radial direction R is not fixed and rotates together with the rotor 22 is described. However, the magnetic gear device 1 of this embodiment is not limited to this. For example, as shown in Table 1, any one of the first magnet 11, the second magnet 12, and the first pole piece 13 may be fixed, and the remaining two may be disposed on the outer side of the radial direction R. Furthermore, either the first magnet 11 or the second magnet 12 may be disposed on the inner side of the radial direction R, and the other may be disposed on the outer side of the radial direction R.

[0066] [Table 1] Furthermore, in the magnetic gear device 1 of the above embodiment, the case where the first magnet 11 has 52 (26 pole pairs) first magnetic poles 111 has been described. However, the number of first magnetic poles 111 of the first magnet 11 in this embodiment is not limited to this and can be set to any number.

[0067] Furthermore, in the magnetic gear device 1 of the above embodiment, the case where the second magnet 12 has 6 (3 pole pairs) second magnetic poles 121 has been described. However, the number of second magnetic poles 121 of the second magnet 12 in this embodiment is not limited to this and can be set to any number.

[0068] Furthermore, in the magnetic gear device 1 of the above-described embodiment, the case where the first pole piece 13 is composed of 29 first modulation pieces 131 has been described. However, the number of first modulation pieces 131 constituting the first pole piece 13 in this embodiment is not limited to this and can be set to any number. It should be noted that, regarding the number of first magnetic poles 111 of the first magnet, the number of second magnetic poles 121 of the second magnet, and the number of modulation pieces 131 of the first pole piece 13, if two of these are determined to be arbitrary numbers, the number of the remaining one is appropriately set based on the numbers of the other two.

[0069] Furthermore, in the motor 2 of the above embodiment, the rotor magnet 221 has been described as having 6 poles. However, the number of magnetic poles of the rotor magnet in this embodiment is not limited to this and can be set to any number.

[0070] Furthermore, in the magnetic gear device 1 of the above-described embodiment, the second magnet 12 is described as having a plurality of second magnetic poles 121 arranged along the circumferential direction C, and the plurality of second magnetic poles 121 being annular and integrally formed. However, the second magnet 12 of this embodiment can also be formed by joining a plurality of magnets, each having two second magnetic poles 121 and formed in an arc shape. Similarly, the first magnet 11 can also be formed by joining a plurality of magnets having two first magnetic poles 111.

[0071] Furthermore, in the magnetic gear device 1 of the above-described embodiment, the input shaft and output shaft can also be interchanged. In this case, the torque is reduced, while the speed is increased. Moreover, with the second magnet 12 disposed inside the radial direction R as the input, the first magnet 11 disposed outside the radial direction R as the output, and the first pole piece 13 fixed, the reduction ratio X3 can be calculated as follows.

[0072] X3 = 11M ÷ 12M = 26 ÷ 3 = 8.67 Alternatively, with the first pole piece 13 as the output, the first magnet 11 as the input, and the second magnet 12 fixed, the speed increase ratio X4 can be calculated as follows.

[0073] X4 = 13M ÷ 12M = 29 ÷ 3 = 9.67 Furthermore, for example, in the magnetic gear device 1 of the above-described embodiment, when the first magnet 11 and the second magnet 12 are interchanged, with the first magnet 11 positioned inside the radial direction R and the second magnet 12 positioned outside the radial direction R, the first magnet 11 side serving as the input shaft and the second magnet 12 side serving as the output shaft, and the first pole piece 13 is fixed, the speed increase ratio X5 can be calculated as follows.

[0074] X5 = 11M ÷ 12M = 26 ÷ 3 = 8.67 Alternatively, with the first pole piece 13 as the output, the first magnet 11 fixed, and the second magnet 12 as the input, the reduction ratio X6 can be calculated as follows.

[0075] X6 = 13M ÷ 12M = 29 ÷ 3 = 9.67 [First variation of the first embodiment] Next, regarding the magnetic gear device 1A of the first modification of the first embodiment, using... Figure 4 Let me explain. Figure 4 This is a top view of the power transmission device 100A of the magnetic gear device 1A according to the first variation of the first embodiment. It should be noted that in the configuration of the magnetic gear device 1A of the first variation of the first embodiment, the same reference numerals are used for configurations identical to those in the magnetic gear device 1 of the first embodiment, and descriptions are omitted. Furthermore, a motor 2, identical to that in the power transmission device 100 of the first embodiment, is disposed inside the radial direction R of the magnetic gear device 1A.

[0076] The magnetic gear device 1A of this modified example has a first magnet 11, a second magnet 12, and a first pole piece 13.

[0077] In the magnetic gear device 1A, the first magnet 11 is disposed inside the radial direction R of the second magnet 12, and the inner peripheral surface of the first back yoke 112 is fixed to the outer peripheral surface of the rotor 22. In this modified example, the first magnet 11 is disposed on the input side (drive side) relative to the second magnet 12.

[0078] In the magnetic gear device 1A, the second magnet 12 is disposed outside the radial direction R of the first magnet 11, and the second back yoke 122 is connected to the output shaft via an intermediate transmission mechanism. In this modified example, the second magnet 12 is disposed on the output side (driven side) relative to the first magnet 11.

[0079] In this modified power transmission device, when the drive motor 2 is used, the rotor 22 rotates about the axis 2o relative to the stator 21. With this rotation, the first back yoke 112 and the first magnet 11, fixed to the rotor 22, rotate together with the rotor 22 in the circumferential direction C. Furthermore, the change in magnetic flux of the first magnetic poles 111 in the first magnet 11 is modulated by the first pole piece 13 and transmitted to the second magnetic poles 121 of the second magnet 12 connected to the driven side. In this modified magnetic gear device 1A, the number of second magnetic poles 121 of the second magnet 12 disposed on the outer side of the first magnet 11 in the radial direction R is less than the number of first magnetic poles 111 of the first magnet 11. Therefore, although the torque is reduced, the rotational speed in the circumferential direction C can be increased. Furthermore, in this modified magnetic gear device 1A, the first magnet 11 has a plurality of first magnetic poles 111 disposed along the circumferential direction C, and the plurality of first magnetic poles 111 are integrally formed in a ring shape. Therefore, for example, compared to a magnetic gear device having a first magnet in the shape of a ring formed by connecting multiple individually formed magnets (for example, the device described in Japanese Patent Application Publication No. 2022-150601), the magnetic gear device 1A of this modified example can narrow the pole pitch of the multiple first magnetic poles 111 on the circumferential C, thereby increasing the speed.

[0080] As explained above, in this modified magnetic gear device 1A, the first magnet 11 is disposed inside the radial direction R of the second magnet 12, and the number of first magnetic poles 111 of the first magnet 11 is greater than the number of second magnetic poles 121 of the second magnet 12. Therefore, in this modified magnetic gear device 1A, the speed of the output shaft disposed outside the radial direction R of the magnetic gear device 1A (output side rotation speed) can be increased compared to the rotational speed of the rotor 22 in the motor 2 (input side rotation speed). Furthermore, this modified magnetic gear device 1A achieves the same function / effect as the magnetic gear device 1 of the first embodiment.

[0081] In the magnetic gear device 1A of this modified example, the first magnet 11 is disposed inside the radial R of the second magnet 12.

[0082] [Second variation of the first embodiment] Next, regarding the magnetic gear device 1B of the second variation of the first embodiment, using... Figure 5 Let me explain. Figure 5 This is a perspective view of the magnetic gear device 1B of the second variation of the first embodiment. It should be noted that in the configuration of the magnetic gear device 1B of the second variation of the first embodiment, the same reference numerals are used for configurations identical to those in the magnetic gear device 1 of the first embodiment, and descriptions are omitted. Furthermore, although the illustration is omitted, a rotor 22 of the motor 2, identical to that of the power transmission device 100 of the first embodiment, is fixed to the inner circumferential surface of the second magnet 12 in the radial direction R.

[0083] The magnetic gear device 1B of this modified example has a first magnet 11, a second magnet 12 and a first pole piece 13, with the first magnet 11 and the second magnet 12 facing each other in the axial direction A through the first pole piece 13.

[0084] The outer peripheral surface of the output shaft is fixed to the inner peripheral surface of the first magnet 11 in the radial direction R. That is, in this modified example, the first magnet 11 is disposed on the output side (driven side) relative to the second magnet 12.

[0085] In the magnetic gear device 1B of this modified example, the first magnet 11 and the second magnet 12 are positioned opposite each other in the axial direction A, separated by the first pole piece 13.

[0086] Furthermore, the magnetic gear device 1B of this modification allows for the coaxial arrangement of the axis of the first magnet 11 and the axis of the second magnet 12, thus facilitating modularization and increasing the flexibility of layout. Moreover, the magnetic gear device 1B of this modification achieves the same function / effect as the magnetic gear device 1 of the first embodiment.

[0087] [Third variation of the first embodiment] Figure 6 This is a cross-sectional view of the power transmission device 100C of the magnetic gear device 1C having the third variation of the first embodiment. Figure 7-1 yes Figure 6 A perspective view of the magnetic gear device 1C shown. Figure 7-2 yes Figure 6 The diagram shows a top view of the second magnetic gear mechanism 1β included in the magnetic gear device 1C. It should be noted that in the configuration of the magnetic gear device 1C in the third variation of the first embodiment, the same reference numerals are used for configurations identical to those in the magnetic gear device 1 of the first embodiment, and descriptions are omitted. Furthermore, for ease of explanation, in... Figure 7-1 , Figure 7-2 Motor 2 is omitted. Furthermore, in Figure 6 In the diagram, arrow F1 represents the transmission path of the driving force of motor 2.

[0088] In the case of this variation Figure 6 , Figure 7-1 , Figure 7-2 In the description of the power transmission device 100C of the magnetic gear device 1C shown, for ease of understanding of the directions, the direction in which the second shaft 17 extends as the output shaft is called the axial direction A, the direction in which the first magnet 11, the second magnet 12, the third magnet 14 and the fourth magnet 15 rotate is called the circumferential direction C, and the direction included in the plane orthogonal to the axial direction A and passing through the axis 2o and orthogonal to the circumferential direction C is called the radial direction R.

[0089] This variation Figure 6 , Figure 7-1 , Figure 7-2 The power transmission device (gearbox) 100C shown is a device that transmits the torque of the rotor 22 in the motor 2, which is an input device, to the second shaft 17, which is an output shaft. In this modified example, the power transmission device 100C arranges the motor 2 and the magnetic gear device 1C in such a way that the axis 2o of the stator 21 and rotor 22 of the motor 2, which is an input, coincides with the axis 2o of the second shaft 17, which is an output shaft. This power transmission device 100C includes, for example, the magnetic gear device 1C and the motor 2.

[0090] The power transmission device 100C of the third variation of the first embodiment, for example, increases the rotational speed of the rotor 22 of the motor 2, which is the input, on the second shaft 17, which is the output shaft, and outputs it. The power transmission device 100C is, for example, housed in a frame not shown.

[0091] When driving a motor 2 with the above-described configuration, the rotor 22 rotates about the axis 2o relative to the stator 21. As it rotates, the first back yoke 112 and the first magnet 11 fixed to the rotor 22 rotate together with the rotor 22 in the circumferential direction C.

[0092] The magnetic gear device 1C includes, for example, a first magnet 11, a second magnet 12, a first pole piece 13, a third magnet 14, a fourth magnet 15, and a second pole piece 16. Furthermore, the magnetic gear device 1C provides a second shaft 17. In this modified example of the magnetic gear device 1C, the first magnet 11, the second magnet 12, and the first pole piece 13 constitute a first magnetic gear mechanism 1α, and the third magnet 14, the fourth magnet 15, and the second pole piece 16 constitute a second magnetic gear mechanism 1β. That is, the magnetic gear device 1C is a device in which two-stage magnetic gear mechanisms 1α and 1β are arranged in the axial direction A. More specifically, the magnetic gear device 1C is a device in which the first magnetic gear mechanism 1α and the second magnetic gear mechanism 1β are connected in the axial direction A. More specifically, the first magnetic gear mechanism 1α is arranged on the input side, and the second magnetic gear mechanism 1β is arranged on the output side.

[0093] The first magnetic gear mechanism 1α is disposed on one side of axis A (input side) where the motor 2 is disposed. The second magnetic gear mechanism 1β is disposed on the other side of axis A (output side) where the second shaft 17, which serves as the output shaft, is disposed.

[0094] The first magnet 11 is disposed in the magnetic gear device 1C in a manner that allows it to rotate about an axis 2o relative to the frame and the first pole piece 13. The first magnet 11 has a plurality (e.g., 28) of first magnetic poles 111 arranged circumferentially C, and the plurality of first magnetic poles 111 are annular and integrally formed. Furthermore, a first space S1 is formed between the first magnet 11 and the first pole piece 13 in the radial direction R. In other words, the first magnet 11 is configured to rotate about an axis 2o without contacting the first pole piece 13.

[0095] Multiple first magnetic poles 111 are arranged in an alternating N and S configuration on the circumferential C. Furthermore, the first magnet 11 forms the multiple first magnetic poles 111 by magnetizing a magnetic body as described later.

[0096] The number of first magnetic poles 111 of the first magnet 11 is greater than the number of second magnetic poles 121 of the second magnet 12. Furthermore, the first magnet 11 has a first back yoke 112, for example, provided inside the radial direction R. In the magnetic gear device 1C of this modified example, the first magnet 11 and the second magnet 12 are configured to rotate around a common axis 2o.

[0097] The first magnet 11 has a plurality of (52) first magnetic poles 111 arranged along the circumferential direction C, and the plurality of first magnetic poles 111 are ring-shaped and integrally formed. Furthermore, the plurality of first magnetic poles 111 are arranged in an alternating N and S pole configuration along the circumferential direction C. Additionally, a first back yoke 112 is provided inside the radial direction R of the first magnetic poles 111 in the first magnet 11. It should be noted that, for the first space S1, in the case of a vacuum, or in the presence of fluids such as air, water, or oil, as long as rotation of the first magnet 11 and the first pole piece 13 is permitted, it can also be filled with a non-magnetic material such as a resinous sliding material.

[0098] The second magnet 12 is configured to rotate about an axis 2o relative to the frame and the first pole piece 13. Furthermore, a second space S2 is formed between the second magnet 12 and the first pole piece 13 in the radial direction R. In other words, the second magnet 12 is configured to rotate about an axis 2o without contacting the first pole piece 13. The second magnet 12 is formed in the same manner as the first magnet 11. That is, the second magnet 12 has a plurality (6) of second magnetic poles 121 arranged along the circumferential direction C, and the plurality of second magnetic poles 121 are ring-shaped and integrally formed. Furthermore, the plurality of second magnetic poles 121 are arranged in an alternating N and S pole configuration in the circumferential direction C. Additionally, a second back yoke 122 is provided on the outer side of the second magnetic poles 121 in the radial direction R of the second magnet 12. It should be noted that, for the second space S2, in the case of a vacuum state, or in the presence of fluids such as air, water, or oil, as long as the rotation of the second magnet 12 and the first pole piece 13 is allowed, it can also be filled with non-magnetic materials such as resin-based sliding materials.

[0099] The first pole piece 13 is composed of a plurality of (e.g., 29) first modulation pieces 131. The first pole piece 13 is located radially between the first magnet 11 and the second magnet 12, magnetically connecting the first magnet 11 and the second magnet 12. The first modulation pieces 131 are formed of magnetic materials, for example, and are arranged at equal intervals along the circumferential direction C, and are fixed to a frame (not shown).

[0100] In the magnetic gear mechanism 1α of this modified example, the number of pole pairs 11M of the first magnet 11 is 26, the number of pole pairs 12M of the second magnet 12 is 3, and the number of modulation plates 131 of the first pole piece 13 is 29. Therefore, with the second magnet 12 on the outer side of the radial R as the output, the first magnet 11 on the inner side of the radial R as the input, and the first pole piece 13 fixed, the speed increase ratio X1 can be calculated as follows.

[0101] X1 = 11M ÷ 12M = 26 ÷ 3 = 8.67 Alternatively, in the magnetic gear mechanism 1α, with the second magnet 12 as the output, the first pole piece 13 as the input, and the first magnet 11 fixed, the speed increase ratio X2 can be calculated as follows.

[0102] X2 = 13M ÷ 12M = 29 ÷ 3 = 9.67 In the first magnetic gear mechanism 1α, a first magnet 11, a second magnet 12, and a first pole piece 13 are formed separately.

[0103] The rotor 22 of the motor 2 is fixed to the inner circumferential surface of the first back yoke 112 of the first magnet 11 in the radial direction R. That is, the motor 2 is located inside the radial direction R of the first magnet 11.

[0104] In the first magnetic gear mechanism 1α, the second magnet 12 is disposed on the outer side of the radial direction R, and the first magnet 11 is disposed on the inner side of the second magnet 12 in the radial direction R.

[0105] The first magnetic gear mechanism 1α is a so-called flux modulation type magnetic gear (high harmonic type magnetic gear device) as follows: when the first back yoke 112 and the first magnet 11 connected to the drive side rotate in the circumferential direction XC with the axis 2o as the center, the change of magnetic flux of the multiple first magnetic poles 111 is modulated by the first pole piece 13 and transmitted to the second magnetic pole 121 of the second magnet 12 connected to the driven side, so that the second magnet 12 rotates with the axis 2o as the center.

[0106] Furthermore, in the first magnetic gear mechanism 1α, the number of second magnetic poles 121 of the second magnet 12 disposed on the output side is less than the number of first magnetic poles 111 of the first magnet 11 disposed on the input side. Therefore, when the first magnetic gear mechanism 1α is operated, although the torque is reduced, the rotational speed can be increased. Also, in the first magnetic gear mechanism 1α, the first magnet 11 has a plurality of first magnetic poles 111 disposed along the circumferential direction C, and the plurality of first magnetic poles 111 are integrally formed into a ring. Therefore, for example, compared to a magnetic gear device having a ring-shaped first magnet formed by connecting a plurality of individually formed magnets (e.g., the device described in Japanese Patent Application Publication No. 2022-150601), the first magnetic gear mechanism 1α can narrow the pole pitch of the plurality of first magnetic poles 111 in the circumferential direction C, thus increasing the speed.

[0107] Furthermore, in the first magnetic gear mechanism 1α, the first magnet 11 is not in contact with the first pole piece 13 in the radial direction R, and the first pole piece 13 is not in contact with the second magnet 12 in the radial direction R. Also, in the first magnetic gear mechanism 1α, the first pole piece 13 is arranged between the first magnet 11 and the second magnet 12 in the radial direction R, and the first magnet 11 and the second magnet 12 are magnetically connected by the first pole piece 13. Therefore, when a torque exceeding the maximum transmission torque set according to the magnetic force of the first magnetic pole 111 and the gap between the first magnet 11 and the first pole piece 13 in the radial direction R is applied to the first magnetic gear mechanism 1α, the first magnetic gear mechanism 1α functions as a torque limiter, stopping the rotation of the second magnet 12 in the circumferential direction C even when the first magnet 11 is rotating in the circumferential direction C. Therefore, the first magnetic gear mechanism 1α can protect the motor 2 by disconnecting the drive side and the driven side in case of overload. Alternatively, in the event that an undesirable torque is generated by the motor 2, the first magnetic gear mechanism 1α functions as a torque limiter, protecting the load side by disconnecting the drive side and the driven side. Furthermore, when the magnetic gear device 1 is used in the electric opening and closing mechanism of household appliances, it can cut off the torque from the drive side when the component on the load side comes into contact with the human body, thus also serving as a safety device that minimizes the impact on the human body.

[0108] The third magnet 14 is configured to rotate about the axis 17o of the second axis 17 relative to the frame and the second pole piece 16. Furthermore, a third space S3 is formed between the third magnet 14 and the second pole piece 16 in the radial direction R. In other words, the third magnet 14 is configured to rotate about the axis 17o without contacting the second pole piece 16. The third magnet 14 is formed in the same manner as the first magnet 11. That is, the third magnet 14 has a plurality (52) of third magnetic poles 141 arranged along the circumferential direction C, and the plurality of third magnetic poles 141 are ring-shaped and integrally formed. Furthermore, the plurality of third magnetic poles 141 are arranged in an alternating N and S pole configuration in the circumferential direction C. Additionally, a third back yoke 142 is provided, for example, on the outer side of the third magnet 14 in the radial direction R. It should be noted that, for the third space S3, in the case of a vacuum state, or in the presence of fluids such as air, water, or oil, as long as the rotation of the third magnet 14 and the second pole piece 16 is allowed, it can also be filled with non-magnetic materials such as resin-based sliding materials.

[0109] The fourth magnet 15 is configured to rotate about the axis 17o of the second axis 17 relative to the frame and the second pole piece 16. Furthermore, a fourth space S4 is formed between the fourth magnet 15 and the second pole piece 16 in the radial direction R. In other words, the fourth magnet 15 is configured to rotate about the axis 17o without contacting the second pole piece 16. The fourth magnet 15 is formed in the same manner as the first magnet 11. That is, the fourth magnet 15 has a plurality (6) of fourth magnetic poles 151 arranged along the circumferential direction C, and the plurality of fourth magnetic poles 151 are annular and integrally formed. Furthermore, the plurality of fourth magnetic poles 151 are arranged in an alternating N and S pole configuration in the circumferential direction C. Additionally, for example, a fourth back yoke 152 is provided inside the fourth magnet 15 in the radial direction R. In the magnetic gear mechanism 1β of this modified example, the third magnet 14 and the fourth magnet 15 are configured to rotate about a common axis 17o. It should be noted that, for the fourth space S4, in the case of a vacuum state, or in the presence of fluids such as air, water, or oil, as long as the rotation of the fourth magnet 15 and the second pole piece 16 is allowed, it can also be filled with non-magnetic materials such as resin-based sliding materials.

[0110] The second pole piece 16 is composed of a plurality of (e.g., 29) second modulation pieces 161, which modulate the magnetic flux of the magnets 14 and 15. The second pole piece 16 is located radially between the third magnet 14 and the fourth magnet 15, magnetically connecting the third magnet 14 and the fourth magnet 15. The second modulation pieces 161 are formed of magnetic materials, for example, and are arranged at equal intervals along the circumferential direction C, and are fixed to a frame (not shown).

[0111] The second shaft 17 is a so-called shaft, for example, formed into a cylindrical shape from a metal component. The second shaft 17 has a center 17o, is integrally formed with the fourth back yoke 152, and is configured to rotate relative to the frame about the center 17o. The second shaft 17 extends axially A relative to the fourth back yoke 152 and rotates circumferentially C together with the fourth magnet 15 and the fourth back yoke 152. Furthermore, the magnetic gear device 1C outputs torque externally by rotating the second shaft 17 about the center 17o in the circumferential direction C.

[0112] Furthermore, in the magnetic gear device 1C of this modified example, the second back yoke 122 and the third back yoke 142 are integrally formed. Also, the second magnet 12 and the third magnet 14 are integrally formed. In this modified example, the second magnet 12 and the third magnet 14 extend in the axial direction A.

[0113] In other words, in this magnetic gear device 1C, the second magnet 12 and the third magnet 14 are connected in the axial direction A, and the third magnet 14 rotates together with the second magnet 12 in the circumferential direction C. More specifically, the second magnet 12 and the third magnet 14 are magnetized as described above using a ring-shaped magnetic body, forming the second magnet 12 on one side of the axial direction A and the third magnet 14 on the other side. As a result, an unmagnetized intermediate portion IM1 is formed between the second magnet 12 and the third magnet 14 in the axial direction A.

[0114] Furthermore, in the axial direction A of the magnetic gear device 1C, the first magnet 11 and the fourth magnet 15 are arranged opposite each other across the fifth space S5 in a manner in which they are not affected by magnetic force.

[0115] In the second magnetic gear mechanism 1β, a third magnet 14, a fourth magnet 15, and a second pole piece 16 are formed separately.

[0116] In the second magnetic gear mechanism 1β, the third magnet 14 is disposed on the outer side of the radial direction R, and the fourth magnet 15 is disposed on the inner side of the third magnet 14 in the radial direction R.

[0117] The second magnetic gear mechanism 1β is a so-called flux modulation type magnetic gear (high harmonic type magnetic gear device) as follows: when the third magnet 14, which is integrally formed with the second magnet 12, rotates together with the second magnet 12 in the circumferential direction XC with the axis 17o as the center, the change of magnetic flux of the multiple third magnetic poles 141 is modulated by the second pole piece 16 and transmitted to the fourth magnetic pole 151 of the fourth magnet 15 connected to the driven side, so that the fourth magnet 15 rotates in the circumferential direction C with the axis 17o as the center.

[0118] Furthermore, in the second magnetic gear mechanism 1β, the number of fourth magnetic poles 151 of the fourth magnet 15 disposed on the output side is less than the number of third magnetic poles 141 of the third magnet 14 disposed on the input side. Therefore, when the second magnetic gear mechanism 1β is operated, although the torque is reduced, the rotational speed can be increased. That is to say, the magnetic gear device 1C of this modified example can increase the rotational speed through the two-stage magnetic gear mechanisms 1α and 1β. Moreover, in the second magnetic gear mechanism 1β, the third magnet 14 is provided with a plurality of third magnetic poles 141 arranged along the circumferential direction C, and the plurality of third magnetic poles 141 are integrally formed into a ring. Therefore, for example, compared with a magnetic gear device having a first magnet that is formed into a ring by connecting a plurality of separately formed magnets (for example, the device described in Japanese Patent Application Publication No. 2022-150601), the second magnetic gear mechanism 1β can narrow the pole pitch of the plurality of third magnetic poles 141 in the circumferential direction C, thereby increasing the speed.

[0119] In the second magnetic gear mechanism 1β, the third magnet 14 is not in contact with the second pole piece 16 in the radial direction R, and the second pole piece 16 is not in contact with the fourth magnet 15 in the radial direction R. Furthermore, the second pole piece 16 is positioned between the third magnet 14 and the fourth magnet 15 in the radial direction R, magnetically connecting the third magnet 14 and the fourth magnet 15 through this second pole piece 16. Therefore, when a torque exceeding the maximum transmission torque set according to the magnetic force of the third magnetic pole 141 and the gap between the third magnet 14 and the second pole piece 16 in the radial direction R is applied to the second magnetic gear mechanism 1β, the second magnetic gear mechanism 1β functions as a torque limiter, stopping the rotation of the fourth magnet 15 in the circumferential direction C even when the third magnet 14 is rotating in the circumferential direction C. Therefore, the second magnetic gear mechanism 1β can protect the motor 2 by disconnecting the drive side and the driven side in case of overload. Alternatively, in the event that an undesirable torque is generated by the motor 2, the second magnetic gear mechanism 1β functions as a torque limiter, protecting the load side by disconnecting the drive side and the driven side. Furthermore, when the magnetic gear device 1 is used in the electric opening and closing mechanism of household appliances, it can cut off the torque from the drive side when the component on the load side comes into contact with the human body, thus also serving as a safety device that minimizes the impact on the human body.

[0120] In the first magnetic gear mechanism 1α of this modified example, the number of second magnetic poles 121 of the second magnet 12 on the output side is 6, and the number of second magnetic poles 121 of the first magnet 11 on the input side is 52. Therefore, the speed increase ratio X1 of the first magnetic gear mechanism 1α is calculated as follows.

[0121] X1=(52÷2) / (6÷2)=8.67 In the second magnetic gear mechanism 1β of this modified example, the fourth magnet 15 on the output side has 6 fourth magnetic poles 151, and the third magnet 14 on the input side has 52 third magnetic poles 141. Therefore, the speed increase ratio X2 of the second magnetic gear mechanism 1β is calculated as follows.

[0122] X2=(52÷2) / (6÷2)=8.67 Therefore, the reduction ratio of the magnetic gear device 1C in this modified example is calculated as follows.

[0123] 8.67 × 8.67 = 75.2 As described above, the magnetic gear device 1C of this modified example has the following configuration. The magnetic gear device 1C includes: an annular first magnet 11 with a plurality of first magnetic poles 111 arranged along the circumferential direction C; an annular second magnet 12 with a plurality of second magnetic poles 121 arranged along the circumferential direction C; a first pole piece 13 located in the radial direction R between the first magnet 11 and the second magnet 12, magnetically connecting the first magnet 11 and the second magnet 12; an annular third magnet 14 with a plurality of third magnetic poles 141 arranged along the circumferential direction C; an annular fourth magnet 15 with a plurality of fourth magnetic poles 151 arranged in the circumferential direction C; and a second pole piece 16 located in the radial direction R between the third magnet 14 and the fourth magnet 15, magnetically connecting the third magnet 14 and the fourth magnet 15. Furthermore, the magnetic gear device 1C connects the second magnet 12 and the third magnet 14 in the axial direction A. The third magnet 14 rotates together with the second magnet 12. The number of first magnetic poles 111 of the first magnet 11 is greater than the number of second magnetic poles 121 of the second magnet 12, and the number of third magnetic poles 141 of the third magnet 14 is greater than the number of fourth magnetic poles 151 of the fourth magnet 15. Also, at least one of the four magnets 11 to 15 in the magnetic gear device 1C is annular. Therefore, in this modified example of the magnetic gear device 1C, the rotational speed (output side rotational speed) of the second shaft 17, which serves as the output shaft, can be increased compared to the rotational speed (input-side rotational speed) of the rotor 22 in the motor 2. Furthermore, in the magnetic gear device 1C of this modified example, the first magnet 11 is not in contact with the first pole piece 13 in the radial direction R, the first pole piece 13 is not in contact with the second magnet 12 in the radial direction R, the third magnet 14 is not in contact with the second pole piece 16, and the second pole piece 16 is not in contact with the fourth magnet 15 in the radial direction R. Therefore, the noise generated during operation can be reduced, dust generation due to use can be prevented, and lubricating oil is not required. Moreover, the magnetic gear device 1C does not generate dust during use and does not require lubricating oil for use, thus requiring no maintenance. Furthermore, compared to a magnetic gear device in which the outer peripheral surfaces of the annular first magnet and the outer peripheral surfaces of the annular second magnet are facing each other and connected only by the opposing magnets, the magnetic gear device 1C of this modified example magnetically connects the first magnetic poles 111 of a plurality of first magnets 11 to the second magnetic poles 121 of a plurality of second magnets 12 in the radial direction with the first pole piece 13 as a distance between them, and magnetically connects the third magnetic poles 141 of a plurality of third magnets 14 to the fourth magnetic poles 151 of a plurality of fourth magnets 15 in the radial direction with the second pole piece 16 as a distance between them. Therefore, the torque density can be improved.

[0124] In the modified magnetic gear device 1C, a first magnet 11 integrally forms a plurality of first magnetic poles 111, and a third magnet 14 integrally forms a plurality of third magnetic poles 141. Therefore, compared with a magnetic gear device having a ring-shaped magnet formed by connecting individually formed magnets in the circumferential direction C, miniaturization and weight reduction can be achieved. Furthermore, since the magnetic gear device 1C has a first magnet 11 and a third magnet 14 with the above-described configuration, not only can the number of parts be reduced, but the shape of the back yoke 112, 122, 142, 152 and / or the frame can be simplified, and there is no need to provide a cover for preventing the first magnetic poles 111 and the third magnetic poles 141 from falling off. In addition, in the first magnet 11, the pole pitch of the plurality of first magnetic poles 111 in the circumferential direction C is narrower, thus reducing torque pulsation; in the third magnet 14, the pole pitch of the plurality of third magnetic poles 141 in the circumferential direction C is narrower, thus reducing torque pulsation.

[0125] The magnetic gear device 1C of this modified example has the aforementioned functions / effects, and therefore, for example, it can be applied to devices used in clean rooms where dust is avoided, devices used in special environments such as marine or aerospace applications, residential equipment and home appliances requiring safety measures in case of human contact and overload countermeasures, and generators that operate at high efficiency. More specifically, the magnetic gear device 1 can be applied to robotic arms, semiconductor manufacturing equipment, electric opening and closing mechanisms of home appliances, electronic locks, cooling pumps and cooling fans for air conditioners, etc.

[0126] In the magnetic gear device 1C of this modified example, the second magnet 12 and the third magnet 14 are integrally formed. Therefore, compared with magnetic gear devices in which the second magnet 12 and the third magnet 14 are formed separately, the magnetic gear device 1C of this modified example can improve the workability during assembly by reducing the number of parts.

[0127] In this modified magnetic gear device 1C, the first magnet 11 is disposed radially R inside the second magnet 12. The magnetic gear device 1 of this embodiment forms a ring-shaped first magnet 11 integrally formed with a plurality of first magnetic poles 111 by magnetizing the magnetic body as described above. Therefore, even with a narrower pole pitch on the inner side radially R, the ring-shaped first magnet 11 can be disposed. Furthermore, the third magnet 14 is disposed radially R outside the fourth magnet 15.

[0128] It should be noted that the description focuses on the case where the second magnet 12 and the third magnet 14 of the magnetic gear device 1C are integrally formed, but the magnetic gear device 1C of this modified example is not limited to this. For example, the second magnet 12 and the third magnet 14 may be formed separately, and an additional annular joint may be formed to replace the intermediate part IM1, connecting the second magnet 12 and the third magnet 14 in the axial direction A through the joint.

[0129] Furthermore, in the aforementioned magnetic gear device 1C, the input and output can also be configured in opposite directions. In this case, although the rotational speed (the circumferential C of the output shaft) decreases on the output side, the torque can be increased.

[0130] Furthermore, in the first magnetic gear mechanism 1α of the modified magnetic gear device 1C described above, the case where the first magnet 11 is the input side, the first pole piece 13 is fixed, the second pole piece 16 is fixed, and the fourth magnet 15 is the output side has been described. However, the magnetic gear device 1 of this embodiment is not limited to this. For example, the input side, the output side, and the fixed parts can be appropriately changed as shown in Table 2.

[0131] [Table 2] It should be noted that in the above-described modified examples, the cases where each magnet 11, 12, 14, and 15 is provided with a back yoke 112, 122, 142, and 152 were described. However, the back yokes 112, 122, 142, and 152 may not necessarily have the function of a back yoke, as long as they can connect (fix) the magnets 11, 12, 14, and 15 to other components.

[0132] Furthermore, in the modified magnetic gear device 1C described above, the first magnet 11 is described as having 52 (26 pole pairs) first magnetic poles 111. However, the number of first magnetic poles 111 of the first magnet 11 in this modified example is not limited to this and can be set to any number. The same applies to the third magnet 14.

[0133] Furthermore, in the modified magnetic gear device 1C described above, the second magnet 12 was described as having six (three pole pairs) second magnetic poles 121. However, the number of second magnetic poles 121 of the second magnet 12 in this modified example is not limited to this and can be set to any number. The same applies to the fourth magnet 15.

[0134] Furthermore, in the modified magnetic gear device 1C described above, the first pole piece 13 is described as being composed of 29 first modulation pieces 131. However, the number of first modulation pieces 131 constituting the first pole piece 13 in this modified example is not limited to this and can be set to any number. It should be noted that, regarding the number of first magnetic poles 111 of the first magnet, the number of second magnetic poles 121 of the second magnet, and the number of modulation pieces 131 of the first pole piece 13, if two of these are determined to be arbitrary numbers, the number of the remaining one is appropriately set based on the numbers of the other two. The same applies to the second pole piece 16.

[0135] Furthermore, in the modified magnetic gear device 1C described above, for example, the radial R positions of the first magnet 11 and the second magnet 12 can be interchanged, as can the radial R positions of the third magnet 14 and the fourth magnet 15. In this case, the speed is reduced, while the torque is increased. Furthermore, in this case, with the first magnet 11 as the input, the second magnet 12 as the output, and the first pole piece 13 fixed, the reduction ratio X3 can be calculated as follows.

[0136] X3 = 11M ÷ 12M = 26 ÷ 3 = 8.67 Alternatively, in this case, with the first pole piece 13 as the output, the first magnet 11 as the input, and the second magnet 12 fixed, the reduction ratio X4 can be calculated as follows.

[0137] X4 = 13M ÷ 12M = 29 ÷ 3 = 9.67 Furthermore, for example, in the modified magnetic gear mechanism 1α described above, when the first magnet 11 and the second magnet 12 are interchanged, with the first magnet 11 positioned on the outer side of the radial direction R and the second magnet 12 positioned on the inner side of the radial direction R, the first shaft 22 of the motor 2 is connected to the second magnet 12 as the input shaft, the first magnet 11 is used as the output shaft, and the first pole piece 13 is fixed, the speed increase ratio X5 can be calculated as follows.

[0138] X5 = 11M ÷ 12M = 26 ÷ 3 = 8.67 Alternatively, in the first magnetic gear mechanism 1α under this condition, with the first pole piece 13 as the output, the first magnet 11 fixed, and the second magnet 12 as the input, the reduction ratio X6 can be calculated as follows.

[0139] X6 = 13M ÷ 12M = 29 ÷ 3 = 9.67 Furthermore, in the modified magnetic gear device 1C described above, a plurality of second magnetic poles 121 are arranged along the circumferential direction C of the second magnet 12, and the plurality of second magnetic poles 121 are annular and integrally formed. However, the second magnet 12 in this modified example can also be formed by joining a plurality of magnets, each having two second magnetic poles 121 and formed in an arc shape. The same applies to the first magnet 11, the third magnet 14, and the fourth magnet 15.

[0140] Furthermore, in the modified magnetic gear device 1C described above, the case where two stages of magnetic gear mechanisms 1α and 1β are arranged in the axial direction A has been explained. However, the modified magnetic gear device 1C is not limited to this. For example, the magnetic gear device 1C may also have three or more stages of magnetic gear mechanisms arranged in the axial direction A.

[0141] [Fourth variation of the first embodiment] Next, regarding the magnetic gear device 1D of the fourth variation of the first embodiment, using... Figure 8 , Figure 9-1 , Figure 9-2 Let me explain. Figure 8 This is a cross-sectional view of the power transmission device 100D of the magnetic gear device 1D having the fourth variation of the first embodiment. Figure 9-1 yes Figure 8 A perspective view of the magnetic gear device 1D shown. Figure 9-2 It means Figure 8 The diagram shows a perspective view of the magnetic gear device on the other side of axis A. It should be noted that in the configuration of the magnetic gear device 1D of the fourth variation of the first embodiment, the same reference numerals are used for configurations identical to those in the magnetic gear device 1C of the third variation of the first embodiment, and descriptions are omitted. Furthermore, for ease of explanation, in... Figure 9-1 , Figure 9-2 Motor 2 is omitted. Furthermore, in Figure 8 In the diagram, arrow F2 represents the transmission path of the driving force of motor 2.

[0142] The power transmission device 100D includes, for example, a magnetic gear device 1D and a motor 2.

[0143] The magnetic gear device 1D includes a first magnetic gear mechanism 1α and a second magnetic gear mechanism 1β. Furthermore, the magnetic gear device 1D is provided with a second shaft 17. The magnetic gear device 1D is a device in which the first magnetic gear mechanism 1α and the second magnetic gear mechanism 1β are connected in the axial direction A.

[0144] The first magnetic gear mechanism 1α is composed of a first magnet 11, a second magnet 12, and a first pole piece 13.

[0145] In the first magnetic gear mechanism 1α, the first magnet 11 is disposed outside the radial direction R of the second magnet 12. The first back yoke 112 is disposed outside the radial direction R of the first magnet 11. In this modified example, the first magnet 11 is disposed on the output side (driven side) relative to the second magnet 12.

[0146] In the first magnetic gear mechanism 1α, the second magnet 12 is disposed inside the radial direction R of the first magnet 11, and the inner circumferential surface of the second back yoke 122 is fixed to the outer circumferential surface of the rotor 22. That is, in this modified example, the second magnet 12 is disposed on the input side (drive side) relative to the first magnet 11.

[0147] In the first magnetic gear mechanism 1α of the magnetic gear device 1D in this modified example, the number of first magnetic poles 111 of the first magnet 11 disposed on the output side is greater than the number of second magnetic poles 121 of the second magnet 12 disposed on the input side. Therefore, when the first magnetic gear mechanism 1α is operated, although the rotational speed in the circumferential direction C is reduced, the torque can be increased.

[0148] The second magnetic gear mechanism 1β is composed of a third magnet 14, a fourth magnet 15, and a second pole piece 16.

[0149] In the second magnetic gear mechanism 1β, the third magnet 14 is disposed inside the radial direction R of the fourth magnet 15. The third back yoke 132 is disposed inside the radial direction R of the third magnet 14. In this modified example, the third magnet 14 is disposed on the output side (driven side) relative to the fourth magnet 15. Moreover, the third back yoke 132 is integrally formed with the second shaft 17. That is, the third back yoke 132 is connected to the second shaft 17.

[0150] In the second magnetic gear mechanism 1β, the fourth magnet 15 is disposed outside the radial direction R of the third magnet 14, and the fourth back yoke 152 is disposed outside the radial direction R of the fourth magnet 15. Furthermore, in this modified example, the fourth magnet 15 is disposed on the input side (drive side) relative to the third magnet 14.

[0151] In the power transmission device 100D of this modified example, when the drive motor 2 is used, the rotor 22 rotates about the axis 2o relative to the stator 21. With this rotation, the second back yoke 122 and the second magnet 12, fixed to the outer circumferential surface of the rotor 22, rotate together with the rotor 22 in the circumferential direction C. Furthermore, the change in magnetic flux of the second magnetic pole 121 in the second magnet 12 is modulated by the first pole piece 13 and transmitted to the first magnetic pole 111 of the first magnet 11. Therefore, the first magnet 11 rotates in the circumferential direction C as the second magnet 12 rotates in the circumferential direction C. Moreover, since the first magnet 11 and the fourth magnet 15 are integrally formed, the fourth magnet 15 rotates in the circumferential direction C as the first magnet 11 rotates in the circumferential direction C. Furthermore, the change in magnetic flux of the fourth magnetic pole 151 in the fourth magnet 15 is modulated by the second pole piece 16 and transmitted to the third magnetic pole 141 of the third magnet 14. Furthermore, since the second shaft 17 is fixed to the third magnet 14, the second shaft 17 rotates in the circumferential direction C as the third magnet 14 rotates in the circumferential direction C.

[0152] In the second magnetic gear mechanism 1β of the magnetic gear device 1D in this modified example, the number of third magnetic poles 141 of the third magnet 14 disposed on the output side is greater than the number of fourth magnetic poles 151 of the fourth magnet 15 disposed on the input side. Therefore, when the second magnetic gear mechanism 1β is operated, although the rotational speed in the circumferential direction C is reduced, the torque can be increased. That is to say, the magnetic gear device 1D in this modified example can increase the torque through the two-stage magnetic gear mechanisms 1α and 1β.

[0153] In the magnetic gear device 1D of this modified example, the first magnet 11 is disposed radially R outside the second magnet 12, and the third magnet 14 is disposed radially R inside the fourth magnet 15. Furthermore, the magnetic gear device 1D of this modified example performs the same function / effect as the magnetic gear device 1C of the third modified example of the first embodiment.

[0154] It should be noted that in the above-described modified magnetic gear device 1D, the case where two stages of magnetic gear mechanisms 1α and 1β are arranged in the axial direction A has been described. However, the magnetic gear device 1D of this modified example is not limited to this. For example, the magnetic gear device 1D may also have three or more stages of magnetic gear mechanisms arranged in the axial direction A.

[0155] Furthermore, in the modified magnetic gear device 1D described above, the case where the second magnet 12 is the input side, the first pole piece 13 is fixed, the second pole piece 16 is fixed, and the third magnet 14 is the output side has been explained. However, the modified magnetic gear device 1D is not limited to this. For example, the input side, output side, and fixing positions can be appropriately changed as shown in Table 3.

[0156] [Table 3] [Fifth variation of the first embodiment] Next, regarding the magnetic gear device 1E of the fifth variation of the first embodiment, using... Figure 10 , Figure 11 Let me explain. Figure 10 This is a top view of the power transmission device 100E of the magnetic gear device 1E having the fifth modified example of the first embodiment. Figure 11 yes Figure 10 A perspective view of the magnetic gear device 1E is shown. It should be noted that in the configuration of the power transmission device 100E of the fifth modification of the first embodiment, for configurations identical to those of the power transmission device 100C of the third modification of the first embodiment, the same reference numerals are used and descriptions are omitted. Furthermore, in Figure 10 In -2, motor 2 is omitted.

[0157] The power transmission device 100E of this modification includes a motor 2 and a magnetic gear device 1E.

[0158] The magnetic gear device 1E includes a first magnetic gear mechanism 1α and a second magnetic gear mechanism 1β. Furthermore, a second shaft 17 is provided in the magnetic gear device 1E. This magnetic gear device 1E is a device in which the first magnetic gear mechanism 1α and the second magnetic gear mechanism 1β are connected radially R.

[0159] The first magnetic gear mechanism 1α is composed of a first magnet 11, a second magnet 12, and a first pole piece 13.

[0160] In the first magnetic gear mechanism 1α, the first magnet 11 is disposed inside the radial direction R of the second magnet 12. In this modified example, a first back yoke 112 is provided inside the radial direction R of the first magnet 11, and the inner circumferential surface of the first back yoke 112 is fixed to the outer circumferential surface of the rotor 22. In this modified example, the first magnet 11 is disposed on the input side (drive side) relative to the second magnet 12.

[0161] In the first magnetic gear mechanism 1α, the second magnet 12 is disposed outside the radial direction R of the first magnet 11. Furthermore, in this modified example, the second magnet 12 does not have a back yoke. Additionally, in this modified example, the second magnet 12 is disposed on the output side (driven side) relative to the first magnet 11.

[0162] The second magnetic gear mechanism 1β is composed of a third magnet 14, a fourth magnet 15, and a second pole piece 16.

[0163] In the second magnetic gear mechanism 1β, the third magnet 14 is disposed inside the radial direction R of the fourth magnet 15. Furthermore, no back yoke is provided on the third magnet 14. In this modified example, the third magnet 14 is disposed on the input side (drive side) relative to the fourth magnet 15.

[0164] In the second magnetic gear mechanism 1β, the fourth magnet 15 is disposed outside the radial direction R of the third magnet 14. In this modified example, a fourth back yoke 152 is provided outside the radial direction R of the fourth magnet 15. Furthermore, an intermediate transmission mechanism (not shown) is disposed outside the radial direction R of the fourth back yoke 152, through which the driving force of the fourth magnet 15 is transmitted to the output shaft. In this modified example, the fourth magnet 15 is disposed on the output side (driven side) relative to the third magnet 14. In the magnetic gear device 1E of this modified example, the first magnet 11, the second magnet 12, the third magnet 14, and the fourth magnet 15 are configured to rotate around a common axis 2o.

[0165] Furthermore, in the power transmission device 100E of this modified example, the second magnet 12 and the third magnet 14 are integrally formed. In other words, the magnetic gear device 1E connects the second magnet 12 and the third magnet 14 in the radial direction R, and the third magnet 14 rotates together with the second magnet 12. More specifically, the second magnet 12 and the third magnet 14 are magnetized as described above using a ring-shaped magnetic body, with the third magnet 14 formed on the outer side of the radial direction R and the second magnet 12 formed on the inner side of the radial direction R. As a result, an unmagnetized intermediate portion IM2 is formed between the second magnet 12 and the third magnet 14 in the radial direction R.

[0166] In the power transmission device 100E of this modified example, when the drive motor 2 is used, the rotor 22 rotates about the axis 2o relative to the stator 21. With this rotation, the first back yoke 112 and the first magnet 11, fixed to the outer circumferential surface of the rotor 22, rotate together with the rotor 22 in the circumferential direction C. Furthermore, the change in magnetic flux of the first magnetic pole 111 in the first magnet 11 is modulated by the first pole piece 13 and transmitted to the second magnetic pole 121 of the second magnet 12. Therefore, the second magnet 12 rotates in the circumferential direction C as the first magnet 11 rotates in the circumferential direction C. Moreover, since the second magnet 12 and the third magnet 14 are integrally formed, the third magnet 14 rotates in the circumferential direction C as the second magnet 12 rotates in the circumferential direction C. Furthermore, the change in magnetic flux of the third magnetic pole 141 in the third magnet 14 is modulated by the second pole piece 16 and transmitted to the fourth magnetic pole 151 of the fourth magnet 15. Therefore, the fourth magnet 15 rotates circumferentially C as the third magnet 14 rotates circumferentially C. Furthermore, the output shaft (not shown) of the fourth back yoke 152, which is connected to the fourth magnet 15 via an intermediate output mechanism (not shown), rotates circumferentially C as the fourth magnet 15 rotates.

[0167] The power transmission device 100E of this modified example has the following configuration. The power transmission device 100E includes: an annular first magnet 11 with a plurality of first magnetic poles 111 arranged along the circumferential direction C; an annular second magnet 12 with a plurality of second magnetic poles 121 arranged along the circumferential direction C; a first pole piece 13 located radially between the first magnet 11 and the second magnet 12, magnetically connecting the first magnet 11 and the second magnet 12; an annular third magnet 14 with a plurality of third magnetic poles 141 arranged along the circumferential direction C; an annular fourth magnet 15 with a plurality of fourth magnetic poles 151 arranged along the circumferential direction C; and a second pole piece 16 located between the third magnet 14 and the fourth magnet 15, magnetically connecting the third magnet 14 and the fourth magnet 15. Furthermore, in the radial direction R of the power transmission device 100E, the second magnet 12 and the third magnet 14 are connected. The third magnet 14 rotates together with the second magnet 12. The number of first magnetic poles 111 of the first magnet 11 is greater than the number of second magnetic poles 121 of the second magnet 12, and the number of third magnetic poles 141 of the third magnet 14 is greater than the number of fourth magnetic poles 151 of the fourth magnet 15. The first magnet 11 has a plurality of first magnetic poles 111 integrally formed, and the third magnet 14 has a plurality of third magnetic poles 141 integrally formed. Therefore, in the power transmission device 100E of this modified example, the rotational speed (output side rotational speed) of the second shaft 17, which serves as the output shaft, can be increased compared to the rotational speed (input side rotational speed) of the rotor 22 in the motor 2. Furthermore, the power transmission device 100E of this modified example has the same function / effect as the power transmission device 100C of the third modified example of the first embodiment.

[0168] In the power transmission device 100E of this modified example, the second magnet 12 and the third magnet 14 are integrally formed. Therefore, compared with a power transmission device in which the second magnet 12 and the third magnet 14 are formed separately, the workability during assembly can be improved by reducing the number of parts.

[0169] In the power transmission device 100E of this modified example, the first magnet 11 is disposed on the inner side of the second magnet 12 in the radial direction R, and the third magnet 14 is disposed on the inner side of the fourth magnet 15 in the radial direction R.

[0170] It should be noted that the description focuses on the case where the second magnet 12 and the third magnet 14 of the power transmission device 100E are integrally formed, but the power transmission device 100E of this modified example is not limited to this. For example, the second magnet 12 and the third magnet 14 may be formed separately, and an additional annular joint may be formed to replace the intermediate part IM2, connecting the second magnet 12 and the third magnet 14 radially R through the joint.

[0171] Furthermore, in the modified magnetic gear device 1E described above, the case where two stages of magnetic gear mechanisms 1α and 1β are arranged in the radial direction R has been explained. However, the modified magnetic gear device 1E is not limited to this. For example, the magnetic gear device 1E may have three or more stages of magnetic gear mechanisms arranged in the radial direction R. Moreover, the modified magnetic gear device 1E described above can be combined with the magnetic gear device 1D to form a three-stage magnetic gear device.

[0172] Furthermore, in the modified magnetic gear device 1E described above, the case where the second magnet 12 is the input side, the first pole piece 13 is fixed, the second pole piece 16 is fixed, and the third magnet 14 is the output side has been explained. However, the modified magnetic gear device 1E is not limited to this. For example, the input side, output side, and fixing positions can be appropriately changed as shown in Table 4.

[0173] [Table 4] [Sixth variation of the first embodiment] Next, regarding the magnetic gear device 1F of the sixth variation of the first embodiment, using... Figure 12 , Figure 13 Let me explain. Figure 12 This is a top view of the power transmission device 100F of the magnetic gear device 1F having the sixth modified example of the first embodiment. Figure 13 yes Figure 12A perspective view of the magnetic gear device 1F is shown. It should be noted that in the configuration of the power transmission device 100F of the sixth modification of the first embodiment, for configurations identical to those of the power transmission device 100C of the third modification of the first embodiment, the same reference numerals are used and descriptions are omitted. Furthermore, in Figure 13 Motor 2 is omitted in the text.

[0174] The power transmission device 100F of this modification includes a motor 2 and a magnetic gear device 1F.

[0175] The magnetic gear device 1F includes a first magnetic gear mechanism 1α and a second magnetic gear mechanism 1β. Furthermore, a second shaft 17 is provided in the magnetic gear device 1F. This magnetic gear device 1F is a device that connects the first magnetic gear mechanism 1α and the second magnetic gear mechanism 1β radially R.

[0176] The first magnetic gear mechanism 1α is composed of a first magnet 11, a second magnet 12, and a first pole piece 13.

[0177] In the first magnetic gear mechanism 1α, the first magnet 11 is disposed outside the radial direction R of the second magnet 12. No back yoke is provided on the first magnet 11. In this modified example, the first magnet 11 is disposed on the output side (driven side) relative to the second magnet 12.

[0178] In the first magnetic gear mechanism 1α, the second magnet 12 is disposed inside the radial direction R of the first magnet 11. A second back yoke 122 is provided inside the radial direction R of the second magnet 12, and the inner circumferential surface of the second back yoke 122 is fixed to the outer circumferential surface of the rotor 22. Furthermore, in this modified example, the second magnet 12 is disposed on the input side (drive side) relative to the first magnet 11.

[0179] The second magnetic gear mechanism 1β is composed of a third magnet 14, a fourth magnet 15, and a second pole piece 16.

[0180] In the second magnetic gear mechanism 1β, the third magnet 14 is disposed outside the radial direction R of the fourth magnet 15. In this modification, a third back yoke 142 is provided outside the radial direction R of the third magnet 14. Furthermore, an intermediate transmission mechanism (not shown) is disposed outside the radial direction R of the third back yoke 142, through which the driving force of the third magnet 14 is transmitted to the output shaft. In this modification, the third magnet 14 is disposed on the output side (driven side) relative to the fourth magnet 15.

[0181] In the second magnetic gear mechanism 1β, the fourth magnet 15 is disposed inside the radial direction R of the third magnet 14. In this modified example, the fourth magnet 15 does not have a back yoke. In this modified example, the fourth magnet 15 is disposed on the input side (drive side) relative to the third magnet 14. In the magnetic gear device 1F of this modified example, the first magnet 11, the second magnet 12, the third magnet 14, and the fourth magnet 15 are configured to rotate around a common axis 2o.

[0182] Furthermore, in the power transmission device 100F of this modified example, the first magnet 11 and the fourth magnet 15 are integrally formed. In other words, the magnetic gear device 1F connects the first magnet 11 and the fourth magnet 15 in the radial direction R, and the fourth magnet 15 rotates together with the first magnet 11. More specifically, the first magnet 11 and the fourth magnet 15 are described by using a ring-shaped magnetic body, which is magnetized as described above, forming the fourth magnet 15 on the outer side of the radial direction R and the first magnet 11 on the inner side of the radial direction R. As a result, an unmagnetized intermediate portion IM2 is formed between the first magnet 11 and the fourth magnet 15 in the radial direction R.

[0183] In the power transmission device 100F of this modified example, when the drive motor 2 is used, the rotor 22 rotates about the axis 2o relative to the stator 21. With this rotation, the second back yoke 122 and the second magnet 12, fixed to the outer circumferential surface of the rotor 22, rotate together with the rotor 22 in the circumferential direction C. Furthermore, the change in magnetic flux of the second magnetic pole 121 in the second magnet 12 is modulated by the first pole piece 13 and transmitted to the first magnetic pole 111 of the first magnet 11. Therefore, the first magnet 11 rotates in the circumferential direction C as the second magnet 12 rotates in the circumferential direction C. Moreover, since the first magnet 11 and the fourth magnet 15 are integrally formed, the fourth magnet 15 rotates in the circumferential direction C as the first magnet 11 rotates in the circumferential direction C. Furthermore, the change in magnetic flux of the fourth magnetic pole 151 in the fourth magnet 15 is modulated by the second pole piece 16 and transmitted to the third magnetic pole 141 of the third magnet 14. Therefore, the third magnet 14 rotates circumferentially C as the fourth magnet 15 rotates circumferentially C. Furthermore, an output shaft (not shown) connected to the third back yoke 142 of the third magnet 14 via an intermediate output mechanism (not shown) rotates circumferentially C as the third magnet 14 rotates.

[0184] The power transmission device 100F of this modified example has the following configuration. The power transmission device 100F includes: an annular first magnet 11 with a plurality of first magnetic poles 111 arranged along the circumferential direction C; an annular second magnet 12 with a plurality of second magnetic poles 121 arranged along the circumferential direction C; a first pole piece 13 located radially between the first magnet 11 and the second magnet 12, magnetically connecting the first magnet 11 and the second magnet 12; an annular third magnet 14 with a plurality of third magnetic poles 141 arranged along the circumferential direction C; an annular fourth magnet 15 with a plurality of fourth magnetic poles 151 arranged along the circumferential direction C; and a second pole piece 16 located between the third magnet 14 and the fourth magnet 15, magnetically connecting the third magnet 14 and the fourth magnet 15. Furthermore, in the radial direction R of the power transmission device 100F of this modified example, the first magnet 11 is connected to the fourth magnet 15, and the fourth magnet 15 rotates together with the first magnet 11. The first magnet 11 has more first magnetic poles 111 than the second magnet 12 has more second magnetic poles 121, and the third magnet 14 has more third magnetic poles 141 than the fourth magnet 15 has more fourth magnetic poles 151. The first magnet 11 has a plurality of first magnetic poles 111 integrally formed, and the third magnet 14 has a plurality of third magnetic poles 141 integrally formed. Therefore, in the power transmission device 100F of this modified example, the torque of the output shaft (output side torque) can be increased compared to the torque of the rotor 22 in the motor 2 (input side torque). Furthermore, the power transmission device 100F of this modified example has the same function / effect as the power transmission device 100C of the third modified example of the first embodiment.

[0185] In the power transmission device 100F of this modified example, the first magnet 11 and the fourth magnet 15 are integrally formed. Therefore, compared with a power transmission device in which the first magnet 11 and the fourth magnet 15 are formed separately, the workability during assembly can be improved by reducing the number of parts.

[0186] In the power transmission device 100F of this modified example, the first magnet 11 is arranged radially R outside the second magnet 12, and the third magnet 14 is arranged radially R outside the fourth magnet 15.

[0187] It should be noted that the description focuses on the case where the first magnet 11 and the fourth magnet 15 of the power transmission device 100F are integrally formed, but the power transmission device 100F of this modified example is not limited to this. For example, the first magnet 11 and the fourth magnet 15 may be formed separately, and an additional annular connecting portion may be formed to replace the intermediate portion IM2, connecting the first magnet 11 and the fourth magnet 15 radially R through the connecting portion. Furthermore, the magnetic gear device 1F of the modified example described above may be combined with a magnetic gear device 1D that reverses the input and output to form a three-stage magnetic gear device.

[0188] Furthermore, in the modified magnetic gear device 1F described above, the case where the first magnet 11 is the input side, the first pole piece 13 is fixed, the second pole piece 16 is fixed, and the fourth magnet 15 is the output side has been explained. However, the modified magnetic gear device 1F is not limited to this. For example, the input side, output side, and fixing positions can be appropriately changed as shown in Table 5.

[0189] [Table 5] [Second Implementation] Figure 14 This is a top view of the power transmission device 100G with magnetic gear device 1 according to the second embodiment. It should be noted that in the configuration of the power transmission device 100G in the second embodiment, the same reference numerals are used for configurations that are the same as those in the power transmission device 100 of the first embodiment, and the descriptions are omitted.

[0190] The power transmission device 100G includes, for example, a magnetic gear device 1 and a motor 2G.

[0191] Motor 2G is an inner rotor type in which the rotor 22 is arranged inside the radial direction R of the stator 21.

[0192] In the magnetic gear device 1, a first magnet 11 is arranged inside the radial direction R, and a second magnet 12 is arranged outside the radial direction R of the first magnet 11.

[0193] The power transmission device 100G in this embodiment has the same function / effect as the power transmission device 100 in the first embodiment.

[0194] Furthermore, the power transmission device 100G of this embodiment can be constructed by mounting a magnetic gear device 1 on the inner circumferential surface of the rotor magnet 221 in the radial direction R, so the magnetic gear device 1 can be easily added to the motor 2G.

[0195] It should be noted that the description focuses on the case where the power transmission device 100G includes both a magnetic gear device 1 and a motor 2G. However, the power transmission device 100G of this embodiment is not limited to this. For example, any one of magnetic gear devices 1A, 1B, 1C, 1D, 1E, and 1F can be used instead of magnetic gear device 1.

[0196] [Third Implementation] Figure 15 This is a top view of the power transmission device 100H with magnetic gear device 1 according to the third embodiment. It should be noted that in the configuration of the power transmission device 100H of the third embodiment, the same reference numerals are used for configurations that are the same as those in the power transmission device 100 of the first embodiment, and the descriptions are omitted.

[0197] The power transmission device 100H includes, for example, a magnetic gear device 1 and a motor 2.

[0198] Motor 2 is an external rotor type with a rotor 22 arranged on the outer side of the stator 21 in the radial direction R.

[0199] The second magnet 12, located on the inner side of the radial direction R, is opposite to the stator 21 in the radial direction R and also functions as the rotor magnet of the rotor 22 in the motor 2.

[0200] In the magnetic gear device 1, the second magnet 12 located inside the radial R is not provided with a second back yoke.

[0201] The power transmission device 100H in this embodiment has the same function / effect as the power transmission device 100 in the first embodiment.

[0202] Furthermore, in the power transmission device 100H of this embodiment, the second magnet 12 of the magnetic gear device 1 is opposite to the stator 21 in the radial direction R, and also functions as the rotor magnet of the rotor 22 in the motor 2. Therefore, it is not necessary to form the second magnet 12 and the rotor magnet separately, thus reducing the number of parts and improving the efficiency of assembly.

[0203] It should be noted that the description focuses on the case where the power transmission device 100H includes both a magnetic gear device 1 and a motor 2. However, the power transmission device 100H of this embodiment is not limited to this. For example, any one of magnetic gear devices 1A, 1B, 1C, 1D, 1E, and 1F can be used instead of magnetic gear device 1.

[0204] [Fourth Implementation] Figure 16 This is a top view of the power transmission device 100I with magnetic gear device 1 according to the fourth embodiment. It should be noted that in the configuration of the power transmission device 100I of the fourth embodiment, the same reference numerals are used for configurations that are the same as those in the power transmission device 100 of the first embodiment and those that are the same as those in the power transmission device 100G of the second embodiment, and the descriptions are omitted.

[0205] The power transmission device 100I includes, for example, a magnetic gear device 1 and a motor 2G.

[0206] Motor 2G is an inner rotor type in which the rotor 22 is arranged inside the radial direction R of the stator 21.

[0207] In the magnetic gear device 1, a first magnet 11 is arranged inside the radial direction R, and a second magnet 12 is arranged outside the radial direction R of the first magnet 11.

[0208] The second magnet 12, located on the outer side of the radial direction R, is opposite to the stator 21 in the radial direction R and also functions as the rotor magnet of the rotor 22 in the motor 2.

[0209] In the magnetic gear device 1, the second magnet 12 located on the outer side of the radial R is not provided with a second back yoke.

[0210] The power transmission device 100I of this embodiment performs the same function / effect as the power transmission device 100 of the first embodiment. Furthermore, in the power transmission device 100I of this embodiment, the second magnet 12 of the magnetic gear device 1 is positioned radially R opposite the stator 21 and also functions as the rotor magnet of the rotor 22 in the motor 2. Therefore, it is not necessary to separately form the second magnet 12 and the rotor magnet, thus reducing the number of components and improving assembly efficiency.

[0211] It should be noted that the description focuses on the case where the power transmission device 100I described above includes both the magnetic gear device 1 and the motor 2G. However, the power transmission device 100I of this embodiment is not limited to this. For example, any one of the magnetic gear devices 1A, 1B, 1C, 1D, 1E, and 1F can be used instead of the magnetic gear device 1.

[0212] [Fifth Implementation] Figure 17 This is a top view of the power transmission device 100J with magnetic gear device 1 according to the fifth embodiment. It should be noted that in the configuration of the power transmission device 100J of the fifth embodiment, the same reference numerals are used for configurations that are the same as those in the power transmission device 100 of the first embodiment, and the descriptions are omitted.

[0213] The power transmission device 100J includes, for example, a magnetic gear device 1 and a motor 2.

[0214] Motor 2 is an external rotor type with a rotor 22 arranged on the outer side of the stator 21 in the radial direction R.

[0215] The rotor magnet 221 and the second magnet 12 of the power transmission device 100J are integrally formed.

[0216] Therefore, in this power transmission device 100J, the rotor magnet 221 is connected to the second magnet 12 in the radial direction R, and the second magnet 12 rotates together with the rotor magnet 221 in the circumferential direction C. More specifically, the rotor magnet 221 and the second magnet 12 are described by using a ring-shaped magnetic body, which is magnetized as described above, forming the rotor magnet 221 on the inner side of the radial direction R and the second magnet 12 on the outer side of the radial direction R. In this embodiment, the number of rotor magnets 221 and the number of second magnets 12 are different, but they can also be the same.

[0217] In the magnetic gear device 1, the second magnet 12 located inside the radial R is not provided with a second back yoke.

[0218] The power transmission device 100J of this embodiment has the same function / effect as the power transmission device 100 of the first embodiment. Furthermore, since the rotor magnet 221 of the power transmission device 100J of this embodiment is integrally formed with the second magnet 12, the work efficiency during assembly can be improved.

[0219] It should be noted that the description refers to the case where the power transmission device 100J includes both a magnetic gear device 1 and a motor 2. However, the power transmission device 100J of this embodiment is not limited to this. For example, any one of magnetic gear devices 1A, 1B, 1C, 1D, 1E, and 1F can be used instead of magnetic gear device 1.

[0220] [Sixth Implementation Method] Figure 18 This is a top view of the power transmission device 100K with magnetic gear device 1 according to the sixth embodiment. It should be noted that in the configuration of the power transmission device 100K of the sixth embodiment, the same reference numerals are used for configurations that are the same as those in the power transmission device 100 of the first embodiment and the power transmission device 100G of the second embodiment, and the descriptions are omitted.

[0221] The power transmission device 100K includes, for example, a magnetic gear device 1 and a motor 2G.

[0222] Motor 2G is an inner rotor type in which the rotor 22 is arranged inside the radial direction R of the stator 21.

[0223] The rotor magnet 221 and the second magnet 12 of the power transmission device 100K are integrally formed.

[0224] Therefore, in this power transmission device 100K, the rotor magnet 221 is connected to the second magnet 12 in the radial direction R, and the second magnet 12 rotates together with the rotor magnet 221 in the circumferential direction C. More specifically, the rotor magnet 221 and the second magnet 12 are described by using a ring-shaped magnetic body, which is magnetized as described above, forming the rotor magnet 221 on the inner side of the radial direction R and the second magnet 12 on the outer side of the radial direction R. In this embodiment, the number of rotor magnets 221 and the number of second magnets 12 are different, but they can also be the same.

[0225] In the magnetic gear device 1, the second magnet 12 located inside the radial R is not provided with a second back yoke.

[0226] The power transmission device 100K of this embodiment performs the same function / effect as the power transmission device 100 of the first embodiment. Furthermore, since the rotor magnet 221 of the power transmission device 100K of this embodiment is integrally formed with the second magnet 12, the work efficiency during assembly can be improved.

[0227] It should be noted that the description focuses on the case where the power transmission device 100K includes both the magnetic gear device 1 and the motor 2G. However, the power transmission device 100K of this embodiment is not limited to this. For example, any one of the magnetic gear devices 1A, 1B, 1C, 1D, 1E, and 1F can be used instead of the magnetic gear device 1.

[0228] The above description covers embodiments and modifications of the power transmission devices 100, 100A, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, and 100K according to the present invention. However, the present invention is not limited to these embodiments and modifications, and various modifications can be made without departing from the spirit of the invention. Inventions constructed by appropriately combining the constituent elements of the above-described embodiments and modifications are also included in the present invention. Inventions that have undergone various modifications without departing from this spirit are also included within the technical scope of the present invention, as will be apparent to those skilled in the art from the claims.

[0229] Explanation of reference numerals in the attached figures: 1, 1A, 1B, 1C, 1D, 1E, 1F: Magnetic gear device (high harmonic type magnetic gear device); 11: First magnet; 111: First magnetic pole; 12: Second magnet; 121: Second magnetic pole; 13: First pole piece; 14: Third magnet; 141: Third magnetic pole; 15: Fourth magnet; 151: Fourth magnetic pole; 16: Second pole piece; 100, 100A, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K: Power transmission device; A: Axial; C: Circumferential; R: Radial.

Claims

1. A power transmission device, comprising: A motor having a stator and a rotor configured to rotate relative to the stator; and The magnetic gear mechanism directly transmits the driving force of the motor. The magnetic gear device includes at least: The first magnet has multiple first magnetic poles arranged circumferentially. The second magnet has multiple second magnetic poles arranged circumferentially. as well as A pole piece, located between the first magnet and the second magnet, magnetically connects the first magnet and the second magnet. At least one of the first magnet and the second magnet is ring-shaped. The magnetic gear device is a high-harmonic type magnetic gear device.

2. The power transmission device according to claim 1, wherein, The rotor has a plurality of rotor magnets, and the plurality of rotor magnets are arranged along the circumferential direction. In the radial direction, the rotor magnet and either the first magnet or the second magnet are arranged to be radially opposed.

3. The power transmission device according to claim 1, wherein, Either the first magnet or the second magnet is radially opposed to the stator and also functions as a rotor magnet of the rotor in the motor.

4. The power transmission device according to claim 2, wherein, The rotor magnet is formed by either the first magnet or the second magnet that is radially opposite the rotor magnet.

5. The power transmission device according to claim 2, wherein, The rotor magnet and either the first magnet or the second magnet that is radially opposite the rotor magnet are integrally formed.

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