JP2019183901A - Multistage magnetic gear device - Google Patents

Abstract

To provide a multistage magnetic gear device capable of realizing a large change gear ratio that no damage occurs even if its rotating shaft is rotated at high speed.SOLUTION: A multistage magnetic gear device 100 of this invention is made as IPM structure in which a first inner magnetic gear 10 rotated at the most high speed is set such that a first inner magnet piece (a permanent magnet) 13 is stored in a magnet storing hole of a rotor core 12 and held at an inner wall of the storing hole. With this arrangement as above, the multistage magnetic gear device 100 is used as a speed-increasing gear, a second rotary shaft 93 fixed to a second outer magnetic gear is driven to rotate, it becomes possible to provide a multistage magnetic gear device that there occurs no possibility of flying-out of a permanent magnet 13 due to centrifugal force even if the first inner magnetic gear 10 is rotated at high-speed under a state that the rotary shaft is rotated at increased high-speed in two-stages by the second magnetic gear device 90 and the first magnetic gear device 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a magnetic gear device that can transmit rotation while decelerating or increasing the speed by the magnetic force of a magnetic gear using a magnet, and in particular, a multistage type that can obtain a high reduction ratio by connecting a plurality of magnetic gear devices. The present invention relates to a magnetic gear device.

As a conventional structure of a magnetic gear device, for example, there is one described in Non-Patent Document 1.
The magnetic gear device described in Non-Patent Document 1 is cylindrical and has a plurality of magnet pieces. The high-speed rotor is disposed on the inner peripheral side and is rotatably supported. The magnetic gear device is rotatable on the outer peripheral side. The high-speed rotor has an outer peripheral surface facing the inner peripheral surface of the low-speed rotor, and a soft magnetic pole piece is placed in the middle of the high-speed rotor and the low-speed rotor. And is held unrotatable.

In the magnetic gear device described in Non-Patent Document 1, a 4-pole pair of magnet pieces is attached to the outer peripheral surface of the high-speed rotor back yoke, and the 22-pole pair is mounted on the inner peripheral surface of the low-speed rotor back yoke. Magnet pieces are attached and 26 pole pieces are arranged in an annular shape.
The magnetic flux flowing between the magnet piece of the high-speed rotor and the magnet piece of the low-speed rotor is modulated by the pole piece arranged in the middle, and when the high-speed rotor is rotated, the low-speed rotor is the ratio of the number of pole pairs of each magnet piece Rotates at a reduction ratio determined by
In the magnetic gear device described in Non-Patent Document 1, the reduction ratio is 5.5, and the high-speed rotor and the low-speed rotor rotate in opposite directions.

  Since the magnetic gear device having such a structure can transmit rotation without contact, it has an excellent characteristic that no noise is generated due to a speed change operation and no lubrication is required.

Since the reduction ratio of the magnetic gear device of this structure is determined by the ratio of the number of pole pairs of the magnet pieces of the high-speed rotor and the low-speed rotor, to increase the reduction ratio, the number of pole pairs of the high-speed rotor can be reduced or the speed can be reduced. What is necessary is just to increase the number of pole pairs of the rotor.
However, as a matter of course, the number of pole pairs of the high-speed rotor cannot be made smaller than 1, and further, 3 is generally used even if the number of pole pairs of the high-speed rotor is reduced due to requirements such as avoiding cogging. Further, when the number of pole pairs of the low speed rotor is increased, the length of each magnet in the circumferential direction is reduced. Therefore, the upper limit depends on the diameter of the low speed rotor, but the number of pole pairs cannot be increased without limitation. Under such circumstances, the actual reduction ratio of the magnetic gear device is often about 10 as an upper limit.

  In order to obtain a larger reduction ratio with a magnetic gear device, a method of connecting and using a plurality of magnetic gear devices is conceivable. In Patent Document 1, a plurality of magnetic gears formed in a cylindrical shape are arranged in the radial direction of the rotating shaft. A two-stage magnetic gear device having an overlapping structure is shown.

  As shown in FIG. 8, a two-stage magnetic gear device 901 disclosed in Patent Document 1 includes a plurality of two-stage magnetic gear devices 901 attached to a first rotating shaft 903 that is rotatably supported via a first inner cylinder 931. The first magnet piece 932, a plurality of second magnet pieces 942 rotatably held, and a first stage magnetic gear device comprising a plurality of fixed first magnetic tooth portions 908, and turnable From a plurality of second magnetic teeth 909 attached to the held second rotating shaft 904, a plurality of third magnet pieces 943 held rotatably, and a plurality of fixed fourth magnet pieces 952. The second stage magnetic gear device.

When this two-stage magnetic gear device 901 is operated as a speed increaser, in the second-stage magnetic gear device, the second magnetic tooth portion 909 attached to the second rotating shaft 904 becomes the input side and the third magnet piece 943 Becomes the output side rotated at a higher speed. In the first-stage magnetic gear device, the second magnet piece 942 is on the input side, and the first magnet piece 932 attached to the first rotating shaft 903 is on the output side rotated at an increased speed.
Since the second magnet piece 942 and the third magnet piece 943 are respectively attached to the inner peripheral portion and the outer peripheral portion of the second inner cylinder 941, the output of the second stage magnetic gear device and the first stage magnetic gear device The inputs are connected by the second inner cylinder 941 and operate as a two-stage magnetic gear device.

  When the multistage magnetic gear device 901 disclosed in Patent Document 1 is operated as a speed increaser, when the second rotary shaft 904 is driven by an electric motor (not shown), the multi-stage magnetic gear device 901 is attached to the second rotary shaft 904. The second magnetic tooth portion 909 of the second stage magnetic gear device also rotates, and the third magnet piece 943 rotates at an increased speed according to the operating principle of the spatial harmonic magnetic gear. Since the third magnet piece 943 and the second magnet piece 942 of the first stage magnetic gear device are both attached to the second inner cylinder 941, when the third magnet piece 943 rotates at an increased speed, the second magnet piece 942 also The first magnet piece 932 of the first-stage magnetic gear device further rotates at a higher speed according to the operating principle of the spatial harmonic magnetic gear.

  In the two-stage magnetic gear device 901 disclosed in Patent Document 1, the magnet pieces and the magnetic tooth portions of the first-stage magnetic gear device and the second-stage magnetic gear device have the diameter of the first rotating shaft 903. It is a structure that overlaps in the direction. Therefore, a multistage magnetic gear device having a large speed increase ratio can be configured without increasing the size in the axial direction of the first rotating shaft 903.

  By the way, in the two-stage magnetic gear device shown in Patent Document 1, the first rotating shaft 903 rotates at the highest speed, but the plurality of first magnet pieces 932 are connected to the first inner cylinder 931 via the first inner cylinder 931. The first inner cylinder 931 and the first magnet piece 932 are fixed to the outer periphery of the rotation shaft 903 by the magnetic force of the first magnet piece 932 and the adhesive force of the adhesive used as necessary.

  As is generally known, the centrifugal force generated in the rotating body is proportional to the square of the rotational speed. Therefore, when the multistage magnetic gear device disclosed in Patent Document 1 is used as a speed increaser, the first magnet piece 932 attached to the outer periphery of the first rotating shaft 903 that is increased in speed and rotates at a high speed is used. A very large centrifugal force works, and in the worst case, there is a problem that the first magnet piece 932 may be peeled off from the first rotating shaft 903 and damaged.

JP 2014-15992 A

K. Atallah and D. Howe, `` A Novel High-Performance Magnetic Gear '', IEEE Transactions on Magnetics, JULY 2001, Vol.37.No.4, p.2844-2846

  The present invention has been made in view of the above, and in a multi-stage magnetic gear device capable of realizing a large gear ratio, it is possible to provide a multi-stage magnetic gear device that is not likely to be damaged even when a rotary shaft is rotated at a high speed. With the goal.

The invention according to claim 1 of the multistage magnetic gear device of the present invention is a substantially cylindrical first inner magnetic gear and a substantially cylindrical first arranged so as to face the outer periphery of the first inner magnetic gear. An outer magnetic gear, and a first magnetic gear device in which a first magnetic pole group in which a plurality of magnetic poles are arranged on the circumference at equal intervals is disposed between the first inner magnetic gear and the first outer magnetic gear. ,
A substantially cylindrical second inner magnetic gear disposed on the outer periphery of the first outer magnetic gear; a substantially cylindrical second outer magnetic gear disposed to face the outer periphery of the second inner magnetic gear; A second magnetic gear device in which a second magnetic pole group in which a plurality of magnetic poles are arranged on the circumference at equal intervals is disposed between the second inner magnetic gear and the second outer magnetic gear;
In the multistage magnetic gear device in which the first outer magnetic gear and the second inner magnetic gear are connected,
When the multistage magnetic gear device is driven to rotate, the first inner magnetic gear rotates at the highest speed, and the first inner magnetic gear includes a rotor core made of a soft magnetic material having a plurality of magnet receiving holes, and And an IPM type magnetic gear having a plurality of permanent magnets housed in the permanent magnet housing holes.

  Since the multi-stage magnetic gear device is used when it is desired to obtain a large gear ratio, especially when it is used as a speed increaser, a rotation greatly increased with respect to the input rotation is output. Therefore, the magnetic gear rotating at the highest speed is driven at a high rotational speed.

In general, in the SPM type magnetic gear, the magnet is fixed to the back yoke by the attractive force of the magnet itself and the adhesive force of the adhesive. However, if a strong force in the peeling direction acts, the magnet may come off the yoke There is.
Centrifugal force due to the rotation of the magnetic gear is one of the forces applied in the direction of peeling off the magnet incorporated in the magnetic gear, but the centrifugal force applied to the rotating object is proportional to the square of the rotational speed. Thus, in the high-speed shaft of a magnetic gear having a large gear ratio, a large centrifugal force proportional to the square of the gear ratio is applied to the magnet, and there is a risk that problems such as the magnet coming off the yoke may occur.

  In the multistage magnetic gear device according to the present invention, the first inner magnetic gear that is the high-speed shaft has an IPM structure in which the permanent magnet is housed in the magnet housing hole of the rotor core and held in the housing hole. 1 It is possible to provide a multi-stage magnetic gear device in which there is no possibility that the magnet will jump out by centrifugal force even when the inner magnetic gear rotates at high speed.

  Moreover, in the invention which concerns on Claim 2 of this invention, the said rotor core has a center hole holding a rotating shaft, The said center hole vicinity of the fan-shaped area | region comprised by the opposing end surface of two adjacent said magnet accommodation holes The opening has a notch that exposes the central hole.

In the multi-stage magnetic gear device according to the present invention, the notch portion where the opening is exposed to the central hole is provided in the vicinity of the central hole of the fan-shaped region of the rotor core. Since the magnetic flux decreases and the magnetic flux flowing out to the outer peripheral side end face of the fan-shaped region that effectively functions in the magnetic gear operation increases, the efficiency of the magnetic gear operation can be further increased.
As a result, it is possible to provide a multistage magnetic gear device that has no fear of being damaged even when rotated at a high speed and has improved operating efficiency.

  As described above, according to the present invention, it is possible to provide a multi-stage magnetic gear device in which there is no possibility that the rotating shaft is damaged even when the rotating shaft is rotated at a high speed.

It is an external view which shows the multistage type magnetic gear apparatus of embodiment of this invention. It is a disassembled perspective view which shows the structure of this Embodiment. It is sectional drawing which shows the assembly structure of this Embodiment. It is a perspective view which shows the structure of the connection rotor of the multistage magnetic gear apparatus of this Embodiment. It is a perspective view which shows the structure of the 1st inner side magnetic gear of the multistage type magnetic gear apparatus of this Embodiment. It is a fragmentary detailed view which shows typically the condition of the magnetic flux which flows in the rotor core of the 1st inner side magnetic gearwheel of this Embodiment. It is sectional drawing which shows the assembly structure of the multistage magnetic gear apparatus of other embodiment of this invention. It is sectional drawing which shows the structure of the conventional two-stage type magnetic gear apparatus.

An embodiment of a multistage magnetic gear device according to the present invention will be described in detail with reference to FIGS. 1, 2, 4 and 5. FIG. In the multi-stage magnetic gear device 100 according to the present embodiment, a case where the number of connected magnetic gear devices is two is described.
1A and 1B are external views showing a multistage magnetic gear device according to an embodiment of the present invention. FIG. 1A is a front view, and FIG.
FIG. 2 is an exploded perspective view showing the overall configuration of the multistage magnetic gear device of the present embodiment.
FIG. 4 is a perspective view showing the configuration of the connecting rotor in the multistage magnetic gear device of the present embodiment, where (a) is an external perspective view and (b) is an exploded perspective view.
FIG. 5 is a perspective view showing the configuration of the first inner magnetic gear in the multistage magnetic gear device of the present embodiment, where (a) is an external perspective view and (b) is an exploded perspective view.

  As shown in FIG. 1, the appearance of the multistage magnetic gear device 100 according to the present embodiment is substantially cylindrical and has shafts that rotate on both end faces. When one of the shafts is driven to rotate, the other shaft rotates at a variable speed. In the multistage magnetic gear device 100 shown in FIG. 1, when the first rotating shaft 11 protruding from one end face is rotationally driven, the second rotating shaft 93 protruding from the other end face is rotated at a reduced speed, and a large value corresponding to the reduction ratio is obtained. Torque is obtained. Further, when the second rotating shaft 93 protruding from the other end surface is rotationally driven, the first rotating shaft 11 protruding from the one end surface rotates at an increased speed although the torque decreases.

  In the multistage magnetic gear device 100 according to the present embodiment, an example will be described in which the second rotating shaft 93 is rotationally driven and the first rotating shaft 11 is used as a speed-up gear that rotates at a higher speed.

[Components of multi-stage magnetic gear unit]
Next, components of the multistage magnetic gear device 100 according to the present embodiment will be described with reference to FIG. FIG. 2 is a perspective view of a state in which the multistage magnetic gear device 100 is disassembled in the axial direction. In order to facilitate understanding, a quarter of the entire circumference of each component is cut out.

  The multistage magnetic gear device 100 according to the present embodiment includes an input stage second magnetic gear device 90 that is rotationally driven from the outside, and an output stage first magnetic gear device 40 that is connected to the second magnetic gear device 90. It is composed of a two-stage magnetic gear device.

  The second magnetic gear device 90 at the input stage includes a second outer magnetic gear 80, a second magnetic pole group 70, a second inner magnetic gear 60, and the like.

The second outer magnetic gear 80 has a plurality of second outer magnet pieces 81 arranged in the circumferential direction so that adjacent magnet pieces have different polarities on the inner circumference of a substantially cylindrical outer back yoke 82 made of a soft magnetic material. It is arranged at equal intervals.
A substantially disc-shaped rotating plate 92 is attached to one end of the substantially cylindrical outer back yoke 82, and the central portion of the rotating plate 92 protrudes to one side to form a second rotating shaft 93. As a result, the second outer magnetic gear 80 and the second rotating shaft 93 rotate together. A bearing is incorporated in the base portion on the other side of the second rotating shaft 93.

  In the second magnetic pole group 70, a plurality of second magnetic pole pieces 71 made of a soft magnetic material are embedded at equal intervals in the circumferential direction in a substantially cylindrical second magnetic pole holder 72 made of a nonmagnetic material.

  As shown in FIG. 4, the second inner magnetic gear 60 includes a plurality of second inner magnet pieces on the outer periphery of a substantially cylindrical connection yoke 51 made of a soft magnetic material so that adjacent magnet pieces have different polarities. 61 are arranged at equal intervals in the circumferential direction.

  The first magnetic gear device 40 at the output stage includes the first outer magnetic gear 30, the first magnetic pole group 20, the first inner magnetic gear 10, and the like.

  As shown in FIG. 4, the first outer magnetic gear 30 includes a plurality of first outer magnets on the inner periphery of a substantially cylindrical connection yoke 51 made of a soft magnetic material so that adjacent magnet pieces have different polarities. The pieces 31 are arranged at equal intervals in the circumferential direction. The connection yoke 51 is shared with the second inner magnetic gear 60.

The first magnetic pole group 20 is formed by laminating a plurality of first magnetic pole pieces 21 produced by laminating a soft magnetic plate material such as a silicon steel plate on a bottomed substantially cylindrical first magnetic pole holder 22 made of a nonmagnetic material. Embedded in the direction at equal intervals. A support shaft 22a is provided at the center of the bottom of the first magnetic pole holder 22 so as to protrude outward.
In the present embodiment, the first magnetic pole piece 21 is an example in which plate materials are laminated, but may be made of an integral soft magnetic material.

As shown in FIG. 5, the first inner magnetic gear 10 includes a substantially disk-shaped rotor core 12 and a plurality of first inner magnet pieces 13 manufactured by laminating soft magnetic plate materials such as silicon steel plates.
The rotor core 12 is provided with a central hole 12a at substantially the center and a plurality of substantially rectangular magnet receiving holes 12b radially at the central hole 12a at equal angular intervals.
A plurality of first inner magnet pieces (permanent magnets) 13 are housed in the plurality of magnet housing holes 12b so that the opposing surfaces of adjacent magnet pieces have the same polarity, and the first rotating shaft is placed in the center hole 12a. 11 is held unrotatable.
In this embodiment, the rotor core 12 is an example in which plate materials are laminated. However, the rotor core 12 may be made of an integral soft magnetic material.

  The substantially disk-shaped fixing plate 91 has a central hole in which a bearing is incorporated, and holds the first rotating shaft 11 of the first inner magnetic gear 10 so as to be rotatable.

  Note that an assembly in which the second inner magnet piece 61 and the first outer magnet piece 31 are attached to the connection yoke 51 is referred to as a connection rotor 50. The connection rotor 50 is formed by integrating a first outer magnetic gear 30 and a second inner magnetic gear 60 with a connection yoke 51.

[Assembly structure of multi-stage magnetic gear unit]
Next, with reference to FIG. 3, the assembly structure of each component of the multistage magnetic gear device 100 according to the present embodiment will be described. FIG. 3A is a cross-sectional view showing the assembly structure of the multistage magnetic gear device 100 taken along line AA in FIG. 1A, and FIG. 3B is taken along line BB in FIG. It is sectional drawing which shows the assembly structure of the multistage magnetic gear apparatus 100 which follows.

  In the multistage magnetic gear device 100 according to the present embodiment, it is assumed that the fixing plate 91 on the first rotating shaft 11 side serving as an output shaft is fixed to a holding member (not shown) during speed increasing operation. For this reason, in the following description, description is advanced by using the fixed plate 91 as a foundation of the assembly structure.

  As shown to Fig.3 (a), the 1st rotating shaft 11 of the 1st inner side magnetic gearwheel 10 is attached to the fixed plate 91 via a bearing so that rotation is possible. Further, the first magnetic pole group 20 and the second magnetic pole group 70 are attached to the fixed plate 91 coaxially with the first inner magnetic gear 10 so as not to rotate.

  A connection rotor 50 is held on the outer periphery of the first magnetic pole holder 22 of the first magnetic pole group 20 via connection rotor bearings 52 and 53. Thereby, the connection rotor 50 is rotatably held at an intermediate position between the first magnetic pole group 20 and the second magnetic pole group 70.

  Further, a rotating plate 92 attached to the second outer magnetic gear 80 via a bearing rotates on the support shaft 22a of the first magnetic pole holder 22 of the first magnetic pole group 20 that is non-rotatably attached to the fixed plate 91. Thus, the second outer magnetic gear 80 can be rotated outside the second magnetic pole group 70.

  At this time, as shown in FIG. 3A, the first inner magnetic gear 10, the first magnetic pole group 20, the first outer magnetic gear 30, the second inner magnetic gear 60, the second magnetic pole group 70, and the second outer magnetic gear. The axial positions of the magnet pieces or magnetic pole pieces of the gear 80 are arranged so as to be substantially the same.

  When assembled as described above, the multistage magnetic gear device 100 according to the present embodiment, as shown in FIG. 3B, is directed from the axial center of the first rotating shaft 11 to the radially outer side, and the first inner magnetic gear device. 10, the first magnetic pole group 20, the first outer magnetic gear 30, the second inner magnetic gear 60, the second magnetic pole group 70, and the second outer magnetic gear 80 are arranged concentrically.

Among the above, the first magnetic pole group 20 and the second magnetic pole group 70 are fixed to a fixed plate 91, the first inner magnetic gear 10 and the second outer magnetic gear 80 are rotatably held, and the first outer magnetic gear is held. The connecting rotor 50 in which the gear 30 and the second inner magnetic gear 60 are integrated is also held rotatably.
The second inner magnetic gear 60, the second magnetic pole group 70, and the second outer magnetic gear 80 form a second magnetic gear device 90 that operates as a space harmonic magnetic gear as a set, and the first inner magnetic gear 10 and the first magnetic pole group 20. The first outer magnetic gear 30 becomes a first magnetic gear device 40 that operates as a spatial harmonic magnetic gear as a set.
Since the first outer magnetic gear 30 and the second inner magnetic gear 60 are integrated by the connecting rotor 50, the second magnetic gear device 90 and the first magnetic gear device 40 are connected in series, and the multistage magnetic gear device 100 is connected. It becomes.

Therefore, when the second rotating shaft 93 is rotationally driven by an external drive mechanism or the like (not shown), the second outer magnetic gear 80 of the second magnetic gear device 90 rotates at the input rotational speed, and the spatial harmonic magnetic gear The second inner magnetic gear 60 rotates at an increased speed according to the operating principle.
Since the second inner magnetic gear 60 and the first outer magnetic gear 30 are integrated by the connecting rotor 50, when the second inner magnetic gear 60 rotates at an increased speed, the first outer magnetic gear 30 also rotates at the same speed.

When the first outer magnetic gear 30 of the first magnetic gear device 40 rotates, the first inner magnetic gear 10 further rotates at a higher speed according to the operating principle of the spatial harmonic magnetic gear, and is fixed to the first inner magnetic gear 10. The rotating shaft 11 also rotates at a further increased speed.
As a result, in the multistage magnetic gear device 100, the rotation input to the second rotating shaft 93 is rotated in two steps by the second magnetic gear device 90 and the first magnetic gear device 40 from the first rotating shaft 11. Is output.

In the present embodiment, the second inner magnetic gear 60 of the second magnetic gear device 90 at the input stage incorporates a second inner magnet piece 61 of a three-pole pair, and the second outer magnetic gear 80 has a ten-pole pair. The second outer magnetic pole piece 81 is incorporated, and thirteen second magnetic pole pieces 71 are incorporated in the second magnetic pole group 70, satisfying the conditions for operating as a magnetic gear. Thus, the second magnetic gear device 90 operates as a magnetic gear device having a gear ratio of 10/3 = 3.333.
The first inner magnetic gear 10 of the first magnetic gear device 40 at the output stage incorporates a first inner magnetic pole piece 13 having a three-pole pair, and the first outer magnetic gear 30 has a first outer magnet having a sixteen-pole pair. A piece 31 is incorporated, and 19 first magnetic pole pieces 21 are incorporated in the first magnetic pole group 20, satisfying the condition for operating as a magnetic gear. Accordingly, the first magnetic gear device 40 operates as a magnetic gear device having a gear ratio of 16/3 = 5.333.
Therefore, the gear ratio of the multistage magnetic gear device 100 is (10/3) × (16/3) = 17.777.
It becomes.

  Therefore, in the multistage magnetic gear device 100 according to the present embodiment, even when the second rotating shaft 93 is rotated at, for example, 5 rotations per second, that is, at a medium speed of 300 RPM, the first rotating shaft 11 is at a high speed of 5000 RPM or more. Rotate.

  By the way, since the centrifugal force is proportional to the square of the rotation speed, the first inner magnetic gear 10 including the first rotation shaft 11 and the first rotation shaft 11 is compared with (17. 777) × (17.777) ≈316 times the centrifugal force. For this reason, a strong centrifugal force is applied to the first inner magnet piece 13 of the first inner magnetic gear 10, and the first inner magnet piece 13 receives a force in the direction of being peeled off from the rotor core 12.

In the multistage magnetic gear device 100 according to the present embodiment, a plurality of first inner magnet pieces (permanent magnets) 13 of the first inner magnetic gear 10 that rotates at the highest speed are a plurality of substantially rectangular magnets provided on the rotor core 12. The IPM structure accommodated in the accommodation hole 12b was adopted.
Accordingly, since the centrifugal force applied to the first inner magnet piece 13 is received by the inner wall on the outer peripheral side of the magnet housing hole 12b, a multi-stage magnetic gear device is provided which is less likely to be peeled off from the rotor core 12. it can.

  In the IPM structure, the first inner magnet piece 13 is housed in the magnet housing hole 12b, and the first inner magnet piece 13 is filled by filling the gap between the magnet housing hole 12b and the first inner magnet piece 13 with an adhesive. Is attracted and held in the magnet housing hole 12b by the magnetic force of the first inner magnet piece 13 itself, and is fixed by an adhesive in the gap between the magnet housing hole 12b and the first inner magnet piece 13.

  In a general SPM structure magnetic gear, an adhesive is applied to the contact surface between the magnet and the rotor when the magnet is bonded to the rotor, but most of the adhesive applied to the contact surface between the magnet and the rotor is pushed out by the magnetic force of the magnet. In many cases, only a slight amount of adhesive remains on the contact surface between the magnet and the rotor and is held by the adhesive remaining around the magnet.

  In the first inner magnetic gear 10 of the present embodiment, the first inner magnet piece 13 is housed in the magnet housing hole 12 b, but the inner dimension of the magnet housing hole 12 b inevitably is larger than the outer dimension of the first inner magnet piece 13. Slightly larger. Therefore, when one surface of the first inner magnet piece 13 having a rectangular cross section is attracted to one surface of the magnet accommodation hole 12b by the magnetic force of the first inner magnet piece 13, the other surface of the first inner magnet piece 13 and the magnet accommodation. Since there is a gap between the other surfaces of the hole 12b, an appropriate amount of adhesive can be filled in the gap between the other surface of the first inner magnet piece 13 and the other surface of the magnet housing hole 12b. High adhesive strength can be obtained.

  As described above, in the first inner magnetic gear 10 of the present embodiment having the IPM structure, the first inner magnet piece 13 accommodated in the magnet accommodation hole 12b can be firmly held by the adhesive. Even if the first inner magnetic gear 10 is accelerated at a high speed by the two-stage magnetic gear device, it is possible to provide a multi-stage magnetic gear device that is less likely to peel off the first inner magnet piece 13 from the rotor core 12.

[Effect of missing part]
Next, with reference to FIG. 6, the improvement effect of the operation efficiency by the notch part 12c provided in the rotor core 12 of the multistage magnetic gear apparatus 100 by this Embodiment is described.
FIG. 6A is a partial detailed view schematically showing the state of magnetic flux flowing in the rotor core when the rotor core is not provided with a notch, unlike FIG. 6, and FIG. 6B is a rotor core according to this embodiment. FIG. 5 is a partial detail view schematically showing the state of magnetic flux flowing in the rotor core when a notch is provided in FIG.

  In the rotor of the IPM structure, the facing surfaces of two magnets housed in two adjacent magnet housing holes have the same polarity. For example, when the facing surfaces are N poles, as shown in FIG. The magnetic flux from the N poles of each of the first inner magnet pieces 13 passes through the fan-shaped region sandwiched between the two magnet pieces of the rotor core 12x not provided with a notch different from the present embodiment, and the outer periphery of the fan-shaped region. It flows out to the side end face and the inner peripheral end face. Of these, the magnetic flux Fa that flows out to the outer peripheral side end face of the fan-shaped region flows into the first magnetic pole group 20 (see FIG. 3) on the outer peripheral side of the rotor core 12x. The magnetic flux Fb that has flowed out to the end passes only through the central hole 12a and returns to the S pole side of the first inner magnet piece 13, and does not function effectively for the magnetic gear operation.

  On the other hand, in the multistage magnetic gear device 100 according to the present invention, as shown in FIGS. 6B and 5B, the center of the fan-shaped region sandwiched between the two first inner magnet pieces 13 of the rotor core 12 is used. A notch 12c whose opening is exposed to the central hole 12a is provided in the vicinity of the hole 12a. As a result, the magnetic path passing through the inner peripheral side end face of the fan-shaped region increases the distance that passes through the air, and the magnetic resistance increases.

For this reason, for example, when the opposing surfaces of the two first inner magnet pieces 13 are N poles, the magnetic flux from the N poles of the two first inner magnet pieces 13 passes through the fan-shaped area and is within the fan-shaped area. The magnetic flux Fb flowing out to the peripheral side end surface decreases, and the magnetic flux Fa flowing out to the outer peripheral side end surface of the fan-shaped region that effectively functions in the magnetic gear operation increases, so that the efficiency of the magnetic gear operation can be further increased.
Thereby, in the multistage magnetic gear device 100 in which the notch is provided in the rotor core, it is possible to provide a multistage magnetic gear device in which the operation efficiency is further improved without being damaged even if the rotor core is rotated at a high speed.

[Connection rotor holding structure]
In the multi-stage magnetic gear device 100 according to the present invention, the two-stage magnetic gear device of the second magnetic gear device 90 and the first magnetic gear device 40 is integrated with the second inner magnetic gear 60 and the first outer magnetic gear 30. The connection rotor 50 is connected.
Thus, in the case of the structure in which the second inner magnetic gear 60 and the first outer magnetic gear 30 are integrated, the rotation of the second inner magnetic gear 60 and the first outer magnetic gear 30, that is, the rotation of the connecting rotor 50 is a multi-stage magnetic gear. There is no need to take the gear device 100 outside.

  In the multistage magnetic gear device 100 according to the present embodiment, as shown in FIG. 3A, the second rotating shaft 93 that is a rotation input shaft from the outside and the first rotating shaft 11 that is a rotation output shaft are rotating shafts. In the vicinity of the shaft core, the support shaft 22a and the fixed plate 91 are rotatably supported by bearings, respectively, so that the rotation of the shaft can be taken out to the outside. On the other hand, the connection rotor 50 cannot extract the rotation to the outside of the multistage magnetic gear device 100, but the connection rotor bearing is provided with the inner peripheral portion provided on the outer peripheral portion of the first magnetic pole holder 22 of the first magnetic pole group 20. 52 and 53 are rotatably held, and the parts do not protrude in the rotation axis direction.

  Thus, in the multistage magnetic gear device 100, the bearings that hold the first rotating shaft 11 and the second rotating shaft 93, which are input / output of rotation from the outside, are connected to the rotating shaft, although the magnetic gears are connected in two stages. Since only the necessary number is arranged near the core and the axial length of the multi-stage magnetic gear device 100 does not increase, the multi-stage magnetic gear that is small in the rotation axis direction and is not damaged even if it is rotated at high speed. A gear device can be provided.

  In the connection rotor 50, since the rotation generated in the second inner magnetic gear 60 is directly transmitted to the first outer magnetic gear 30 via the connection yoke 51, ideally, the connection rotor bearings 52 and 53 have a radial direction. The power of is not generated. Further, the magnet pieces or pole pieces of each of the first inner magnetic gear 10, the first magnetic pole group 20, the first outer magnetic gear 30, the second inner magnetic gear 60, the second magnetic pole group 70, and the second outer magnetic gear 80 are used. Since the axial center positions are substantially the same, ideally no thrust force is generated in the connecting rotor bearings 52 and 53. For this reason, the connection rotor bearings 52 and 53 can be made into bearings with a very small rated load, and the size of the multistage magnetic gear device 100 can be reduced.

[Assembly structure of three-stage magnetic gear unit]
Next, an assembly structure of a multistage magnetic gear device 200 in which three stages of magnetic gear devices are connected will be described with reference to FIG. FIG. 7 is a cross-sectional view of the multi-stage magnetic gear device 200 at a position corresponding to the line AA in FIG. 1A, and FIG. FIG. 2B is a sectional view of the assembled state.

  In the multi-stage magnetic gear device 200 with three-stage connection, the fixed plate 191 and the rotary plate 192 have a larger diameter than in the multi-stage magnetic gear apparatus 100 with two-stage connection. A large-diameter third outer magnetic gear 130 is provided on the outermost peripheral portion of the increased diameter rotating plate 192, and a large-diameter third magnetic pole group 120 is provided near the outer periphery of the increased diameter fixed plate 191. Accordingly, as shown in FIG. 7A, the first magnetic pole group 20, the second magnetic pole group 70, and the third magnetic pole group 120 are concentrically fixed to the fixed plate 191 in order from the inner peripheral side.

  The connecting rotor 50 incorporated in the two-stage multi-stage magnetic gear device 100 is connected between the first magnetic pole group 20 and the second magnetic pole group 70 in the same manner as the two-stage multi-stage magnetic gear apparatus 100. Is held rotatably. Further, between the newly provided third magnetic pole group 120 and the second magnetic pole group 70, as shown in FIG. 7A, the diameter is larger than that of the connection rotor 50, and the second outer magnetic gear 80 and the third inner magnetic group 80 are arranged. A second connection rotor 150 to which the magnetic gear 110 is attached is provided.

  As described above, in the multistage magnetic gear device 200, as shown in FIG. 7B, the first inner magnetic gear 10, the first magnetic pole group 20, and the first outer magnetic gear 30 are disposed outward from the first rotating shaft 11. , The second inner magnetic gear 60, the second magnetic pole group 70, the second outer magnetic gear 80, the third inner magnetic gear 110, the third magnetic pole group 120, and the third outer magnetic gear 130 are arranged concentrically adjacent to each other.

The third inner magnetic gear 110, the third magnetic pole group 120, and the third outer magnetic gear 130 operate as a set of magnetic gear devices in a set, and the second inner magnetic gear 60, the second magnetic pole group 70, and the second outer magnetic gear. Reference numeral 80 denotes a set of intermediate magnetic gear units, and the first inner magnetic gear 10, the first magnetic pole group 20, and the first outer magnetic gear 30 operate as a set of output stage magnetic gear units.
The first outer magnetic gear 30 and the second inner magnetic gear 60 are integrated by a connection rotor 50, and the second outer magnetic gear 80 and the third inner magnetic gear 110 are integrated by a second connection rotor 150. Therefore, the multistage magnetic gear device 200 operates as a multistage magnetic gear device having three stages of connection.

At this time, the holding structure and shaft diameter of the second rotating shaft 193 and the first rotating shaft 11 which are input / output shafts can be the same structure and the same dimensions as in the case of the multi-stage magnetic gear device 100 with two-stage connection. ,
Since there is no need to change, the multi-stage magnetic gear device can be easily made into three stages.

  Further, in the multi-stage configuration described above, the fixed plate 191 and the rotating plate 192 are sufficiently enlarged in diameter, and a necessary number of magnetic pole groups are additionally attached to the fixed plate 191, and connection rotors corresponding to the number of added magnetic pole groups are added. By holding the magnetic pole group in a rotatable manner, the second rotary shaft as the input / output shaft, the holding structure of the first rotary shaft, the dimensions, and the like can be multistaged without changing.

  As described above, in the multistage magnetic gear device according to the present embodiment, adjacent magnetic gears of two magnetic gear devices to be connected are integrated, and the integrated magnetic gear is rotated to a fixed magnetic pole group constituting the magnetic gear device. Since it is configured to be movable, it is possible to provide a multi-stage magnetic gear device with various stages by increasing only the maximum outer diameter while maintaining the same length and mounting dimensions in the rotation axis direction. Become.

  In the above description, the case where the multistage magnetic gear device is used as a speed increaser has been described as an example. However, the same effect of the present invention can be obtained even if the shaft that inputs and outputs rotation is replaced and used as a speed reducer. can get.

  According to the present invention, it is possible to provide a multi-stage magnetic gear apparatus that can realize a large gear ratio and that is not damaged even when the rotating shaft is rotated at a high speed.

DESCRIPTION OF SYMBOLS 10 1st inner side magnetic gear 11 1st rotating shaft 12 Rotor core 12a Center hole 12b Magnet accommodation hole 12c Notch part 12x Rotor core 13 1st inner side magnet piece (permanent magnet)
DESCRIPTION OF SYMBOLS 20 1st magnetic pole group 21 1st magnetic pole piece 22 1st magnetic pole holder 22a Support shaft 30 1st outer side magnetic gear 31 1st outer side magnet piece 40 1st magnetic gear apparatus 50 Connection rotor 51 Connection yoke 52 Connection rotor bearing 53 Connection rotor bearing 60 second inner magnetic gear 61 second inner magnet piece 70 second magnetic pole group 71 second magnetic pole piece 72 second magnetic pole holder 80 second outer magnetic gear 81 second outer magnet piece 82 outer back yoke 90 second magnetic gear device 91 Fixed plate 92 Rotating plate 93 Second rotating shaft 100 Multistage magnetic gear device 110 Third inner magnetic gear 120 Third magnetic pole group 150 Second connecting rotor 191 Fixed plate 193 Second rotating shaft 200 Multistage magnetic gear device Fa Magnetic flux Fb Magnetic flux 901 Two-stage magnetic gear device 903 First rotation shaft 904 Second rotation shaft 908 First magnetic tooth portion 9 9 second magnetic tooth portion 931 first inner cylinder 932 first magnet piece 941 second inner cylinder 942 second magnet piece 943 third magnet piece 952 fourth magnet piece

Claims (2)

A substantially cylindrical first inner magnetic gear, a substantially cylindrical first outer magnetic gear disposed to face the outer periphery of the first inner magnetic gear, and a plurality of magnetic poles on the circumference at equal intervals A first magnetic gear device in which the arranged first magnetic pole group is disposed between the first inner magnetic gear and the first outer magnetic gear;
A substantially cylindrical second inner magnetic gear disposed on the outer periphery of the first outer magnetic gear; a substantially cylindrical second outer magnetic gear disposed to face the outer periphery of the second inner magnetic gear; A second magnetic gear device in which a second magnetic pole group in which a plurality of magnetic poles are arranged on the circumference at equal intervals is disposed between the second inner magnetic gear and the second outer magnetic gear;
In the multistage magnetic gear device in which the first outer magnetic gear and the second inner magnetic gear are connected,
When the multistage magnetic gear device is driven to rotate, the first inner magnetic gear rotates at the highest speed,
The first inner magnetic gear is an IPM type magnetic gear having a soft magnetic rotor core having a plurality of magnet housing holes and a plurality of permanent magnets housed in the permanent magnet housing holes. Multistage magnetic gear unit. The rotor core has a central hole for holding a rotating shaft, and a notch in which an opening is exposed in the central hole in the vicinity of the central hole in a fan-shaped region formed by opposing end surfaces of two adjacent magnet receiving holes. The multi-stage magnetic gear device according to claim 1, further comprising a portion.

Images