JP2009168101A - Magnetic gear device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic gear device, capable of restricting deterioration of transmission efficiency or transmittable torque due to enlargement of a magnet retaining mechanism following enlargement (in diameter) and high speed rotation operation. <P>SOLUTION: The device comprises an input side magnetic gear 2, comprising a plurality of magnets 3, circularly disposed around the axial line of an input rotation shaft 1, with its magnetic force generating surface directed in the axial direction, and an output side magnetic gear 6, comprising a plurality of magnets 5, circularly disposed around the axial line of an output rotation shaft 7, and they are arranged with their magnetic generating surfaces facing each other. A plurality of magnetic passage members 4 of electromagnetic steel are circularly provided to be fixed between the magnetic generating surfaces facing each other to exist between the magnet 3 and the magnet 5. The magnets 3 and 5 are restrained by a fixing part from the diametrically outer side of the respective magnetic gears 2 and 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a magnetic gear device that transmits torque by magnetic attraction and repulsion of a magnet.

  As a reduction gear, a gear device capable of relatively easily transmitting with high efficiency is widely used. However, there is a magnetic gear device that transmits torque by magnetic attraction / repulsion of a magnet.

  As a prior art of a magnetic gear device, for example, a plurality of magnetic bars that transmit magnetism are arranged annularly between an inner ring magnetic gear and an outer ring magnetic gear arranged concentrically, and torque input to the inner ring magnetic gear is used as an outer ring magnetic gear. (See Patent Document 1 etc.).

U.S. Pat. No. 3,378,710

  However, the conventional magnetic gear device has the following problems.

  In the magnetic gear device configured as described above, centrifugal force acts on the magnet when the magnetic gear is operating (during rotation). In particular, the direction of the centrifugal force acting on the inner ring magnetic gear is the radially outward direction, that is, the direction of the magnetic bar. When magnetic gears are increased in size (increased in diameter) and rotated at high speed, the centrifugal force acting on the magnets increases accordingly, and the magnet holding mechanism is increased in size to hold the magnets against the centrifugal force. (Strengthen) is necessary.

  However, when the magnet holding mechanism becomes large, it becomes difficult to keep the distance between the magnet of the inner ring magnetic gear and the magnetic bar short, and there is a concern that transmission efficiency and transmittable torque will deteriorate.

  The present invention has been made in view of the above, and a magnetic gear capable of suppressing deterioration in transmission efficiency and transmittable torque due to an increase in size (increase in diameter) and an increase in the size of a magnet holding mechanism accompanying high-speed rotation. An object is to provide an apparatus.

  In order to achieve the above object, the present invention provides an input side magnetic gear having a plurality of magnets arranged in an annular shape around the axis of an input rotation shaft and having a magnetic force generating surface directed in the axial direction, and coaxial with the input side magnetic gear. An output side magnetic gear having a plurality of magnets arranged annularly around the axis of the output rotation shaft and facing the magnetic force generation surface of the input side magnetic gear, the input side magnetic gear and the output A plurality of magnetic path members made of electromagnetic steel fixed annularly so as to be interposed between the magnets of the input side magnetic gear and the output side magnetic gear, between the opposing magnetic force generation surfaces of the side magnetic gear; Provided on the magnetic force generation surface of the input side magnetic gear and the output side magnetic gear, and includes a fixing portion that restrains the magnet from at least the radial outside of each magnetic gear.

  ADVANTAGE OF THE INVENTION According to this invention, the deterioration of the transmission efficiency and the torque which can be transmitted by the enlargement (magnification) of a magnetic gear apparatus and the enlargement of the magnet holding mechanism accompanying high speed rotation can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 6 is a configuration diagram of a gas turbine generator including the magnetic gear device 100 according to the first embodiment of the present invention.

  In FIG. 6, the gas turbine generator includes a compressor 90 that compresses intake air to generate compressed air, a combustor 91 that mixes and burns compressed air and fuel from the compressor 90, and a combustor 91. The turbine 92 that is rotationally driven by the combustion gas of the turbine, the intermediate shaft 93 that connects the turbine 92 and the compressor 90, and transmits the rotation of the turbine 92 to the compressor 90, is connected to the compressor 90, and is rotationally driven by the compressor 92. Input rotational shaft 1 connected to the input rotational shaft 1, the magnetic gear 100 that converts and outputs the rotational speed of the input rotational shaft 1, and the rotational speed that is connected to the magnetic gear 100 and converted by the magnetic gear 100. And an output rotating shaft 7 that is driven to rotate, and a generator 94 that is connected to the output rotating shaft 7 and generates electric power according to the rotational speed of the output rotating shaft 7. The input rotary shaft 1, the output rotary shaft 7, and other rotary shafts are arranged coaxially and are rotatably supported by a plurality of journal bearings 95 and thrust bearings (not shown).

  FIG. 1 is a cross-sectional view of a vertical plane including the axis of rotation shafts 1 and 7 of the magnetic gear device 100. FIGS. 2 and 3 are views of the magnetic gear device 100 of FIG. FIG. 4 is a cross-sectional view taken along line C-C of the magnetic gear device 100 of FIG. 1, and FIG. 5 is a view of the magnetic gear device 100 as viewed from the direction of the input rotation shaft 1. FIG.

  1 to 5, a magnetic gear device 100 includes a substantially disk-shaped input side magnetic gear 2 and output side magnetic gear 6 that are arranged so that one surfaces thereof face each other, an input side magnetic gear 2, and an output side magnetism. A plurality of magnetic path members 4 disposed between the gears 6, a support 8 for fixing the plurality of magnetic path members 4, and a plate portion 9 for fixing the support 8 to a foundation (not shown).

  The input rotary shaft 1 is connected to the center of one surface of the input side magnetic gear 2 perpendicularly to the surface (see FIG. 5). As the input rotation shaft 1 rotates, the input side magnetic gear 2 is rotationally driven in the circumferential direction. On the other surface of the input side magnetic gear 2, that is, the surface facing the output side magnetic gear 6, a plurality of (for example, ten) magnets 3 (for example, permanent magnets) are annular around the axis of the input rotation shaft 1. (See FIG. 2).

  The output side magnetic gear 6 is the same as the input side magnetic gear 2. That is, the output rotary shaft 7 is connected to the center of one surface of the output side magnetic gear 6 perpendicularly to the surface, and the output rotary shaft 7 is rotated by rotating the output side magnetic gear 2 in the circumferential direction. Driven by rotation. On the other surface of the output-side magnetic gear 6, that is, the surface facing the input-side magnetic gear 2, a plurality of (for example, 14) magnets 5 (for example, permanent magnets) are annular around the axis of the output rotation shaft 7. (See FIG. 3).

  In the input side magnetic gear 2 and the output side magnetic gear 6, the magnets 3 and 5 are arranged such that the distance (radius) from the axis to the plurality of magnets 3 is the same as the distance (radius) from the axis to the plurality of magnets 5. Has been. Further, the input rotary shaft 1 and the output rotary shaft 7 are arranged coaxially. Therefore, the magnet 3 and the magnet 5 face each other regardless of the relative positions of the input side magnetic gear 2 and the output side magnetic gear 6 in the circumferential direction.

  The surface on which the magnet 3 of the input side magnetic gear 2 is provided and the surface on which the magnet 5 of the output side magnetic gear 6 is provided are referred to as a magnetic force generation surface.

  The magnets 3 and 5 are fitted and fixed in magnet fixing grooves provided around the axis and in an annular shape around the axis on the magnetic force generation surfaces of the input side magnetic gear 2 and the output side magnetic gear 6. The input side magnetic gear 2 and the output side magnetic gear 6 are configured such that the distance (radius) from the axis to the magnet fixing groove is the same. The magnets 3 and 5 and the magnet fixing groove are formed in a trapezoidal shape in which a cross section cut along a plane including the axis of the input rotary shaft 1 and the output rotary shaft 7 is reduced in diameter toward the magnetic path member 4. The magnets 3 and 5 are fixed to the magnet fixing groove by contacting with the surfaces corresponding to the lower base and the hypotenuse in the trapezoidal cross section. In particular, the radially outer portion of the input side magnetic gear 2 and the output side magnetic gear 6 as viewed from the magnet fixing groove constitutes a fixing portion that restrains the magnets 3 and 5 from the radially outer side. Thereby, for example, the radial movements of the magnets 3 and 5 due to the centrifugal force acting by the rotation of the input side magnetic gear 2 and the output side magnetic gear 6 can be restricted. Further, the magnets 3 and 5 are arranged such that the magnetic poles are directed in the axial direction, and the N poles and the S poles are arranged alternately in the circumferential direction when viewed from the axial direction. In addition, the magnets 3 and 5 are good also as a structure which laminated | stacked the plate-shaped magnet in the axial direction, the circumferential direction, or radial direction. Thereby, the eddy current which generate | occur | produces in the magnets 3 and 5 can be suppressed.

  The support 8 is formed in a plate shape and is disposed so as to be orthogonal to the axis, and is provided with a circular hole centered on the axis. The support 8 is made of a non-metal (non-magnetic material) such as a resin, and is not easily affected by the magnetic field generated by the magnets 3 and 5. Therefore, the force acting on the support 8 and the generated eddy current can be suppressed by the magnetic field generated by the magnets 3 and 5.

  The magnetic path member 4 is a rod-shaped member. Although the cross-sectional shape is not limited, For example, it has cross-sectional shapes, such as a rectangle (square) and a circle. One end of the magnetic path member 4 is connected (embedded) inside the hole of the support 8 and the other end is arranged in the radial direction. The plurality of magnetic path members 4 are arranged at equal intervals inside the hole of the support 8. That is, the plurality of magnetic path members 4 are arranged annularly around the axis and at equal intervals in the circumferential direction.

  The distance (radius) from the axis to each magnetic path member 4 is set to be the same as the distance (radius) from the axis to the magnet 3 or the magnet 5. Therefore, the magnetic path member 4 is connected to the magnet 3. It arrange | positions so that it may be located between the magnets 5.

  The magnetic path member 4 is formed by laminating silicon steel plates whose surfaces are insulated in the circumferential direction or the radial direction. Thereby, the eddy current which generate | occur | produces by the change of the magnetic field of the rotating shafts 1 and 7 direction can be suppressed. When importance is attached to the circumferential rotational torque load generated by the magnetic field from the magnets 3 and 5, the magnetic path member 4 may be formed by laminating silicon steel plates in the axial direction.

  As shown in FIG. 1, gaps are provided between the magnet 3 and the magnetic path member 4 provided on the magnetic force generating surface of the input side magnetic gear 2 and between the magnet 5 and the magnetic path member 4. Arranged non-contact. The magnetic path member 4 transmits a magnetic field between the magnet 3 and the magnet 5 to each other, and the magnet 3 and the magnet 5 are magnetically meshed via the magnetic path member 4.

  The relationship between the rotational speed of the input rotary shaft 1 (input-side magnetic gear 2) and the rotational speed of the output rotary shaft 7 (output-side magnetic gear 6) of the magnetic gear device 100 is determined by the ratio of the number of magnets 3 and 5. The rotational speed (input rotational speed) of the input rotary shaft 1 is Nin, the number of magnets 3 provided on the input side magnetic gear 2 is Xin, the rotational speed (output rotational speed) of the output rotary shaft 7 is Nout, and the output side magnetic gear If the number of magnets 5 provided in 6 is Xout, the relationship between the input rotation speed Nin and the output rotation speed Nout is expressed by the following equation.

Nin: Nout = Xout: Xin (1)
For example, as shown in the present embodiment, if the number of magnets 3 is 10 (see FIG. 3) and the number of magnets 5 is 14 (see FIG. 4), the ratio between the input rotation speed Nin and the output rotation shaft Nout is 14:10.

  The transmittable torque between the input side magnetic gear 2 and the output side magnetic gear 6 increases as the number of magnets 3 and 5 increases. Further, the transmittable torque between the input side magnetic gear 2 and the output side magnetic gear 6 is determined by the relationship between the number of polar pairs of the magnets 3 and 5 and the number of magnetic path members 4. The polarity pair is a set of N and S poles arranged adjacent to each other in each of the magnets 3 and 5 that are annularly arranged on the magnetic force generating surfaces of the input side and output side magnetic gears 2 and 6. The polar logarithm is the number of pairs of N and S poles.

  When the number of the magnets 3 and 5 is constant, the number of the magnetic path members 4 is configured to be the sum of the polar logarithm of the magnet 3 and the polar logarithm of the magnet 5. The maximum torque that can be transmitted is. This knowledge is obtained by simulation using Fourier analysis or the like. For example, when the number of polar pairs of the magnet 3 is 5 (the number of the magnets 3 is 10) and the number of the polar pairs of the magnet 5 is 7 (the number of the magnets 5 is 14), the number of the magnetic path members 4 is 12. The transmittable torque between the input side magnetic gear 2 and the output side magnetic gear 6 is maximized.

  The operation of the present embodiment configured as described above will be described.

  When the compressor 90 and the turbine 92 are started and the rotary shaft 1 is rotationally driven, the input-side magnetic gear 2 of the magnetic gear device 100 is rotationally driven.

  A plurality of magnets 3 provided on the input-side magnetic gear 2 and a plurality of magnets 5 provided on the output-side magnetic gear 6 are magnetically meshed via the magnetic path member 4. Specifically, since the magnets 3 of the input side magnetic gear 2 are adjacent to each other and the magnetic pole faces toward the magnetic path member 4 are alternated between N and S, the input side magnetic gear 2 is relative to the magnetic path member 4. Then, the opposing surfaces of the magnetic path members 4 facing the input side magnetic gear 2 and the output side magnetic gear 6 are alternately magnetized to the N or S poles. Thus, the output side magnetic gear 6 is rotationally driven in the circumferential direction by the magnetic attractive force or repulsive force acting between the magnetized magnetic path member 4 and the magnet 5. That is, the magnetic gear device 100 transmits the rotational power of the input rotary shaft 1 to the output rotary shaft 7 by causing the magnetic path member 4 to function like a planetary magnetic gear.

  The effect of the present embodiment configured as described above will be described in comparison with the prior art.

  In recent years, it has been proposed to apply a magnetic gear device as a drive transmission mechanism to a relatively small-diameter rotating shaft such as a shaft of a machine tool. For example, in a gas turbine power generation facility, a large torque is transmitted. The turbine and the generator connected to each other need a rotating shaft having a correspondingly large diameter. Therefore, when the magnetic gear device is applied to the speed reducer between the gas turbine and the generator, the magnetic gear is necessarily enlarged. In particular, in the case of a gas turbine power generation facility, the centrifugal force is remarkably larger than that of a machine tool shaft or the like because the gas turbine rotates at a high speed during rated operation, coupled with a shaft diameter difference.

  When a magnetic gear device in which a plurality of magnetic bars that transmit magnetism are annularly arranged between the inner ring magnetic gear and the outer ring magnetic gear as in the prior art is applied to a gas turbine power generation facility, the magnet resists this large centrifugal force. Therefore, it is necessary to strengthen the magnet holding mechanism. As a result, when the magnet holding mechanism becomes large, it becomes difficult to keep the distance between the magnet of the inner ring magnetic gear and the magnetic bar short, and there is a concern that transmission efficiency and transmittable torque will deteriorate.

  In the prior art, if the magnetic gear becomes longer in the axial direction along with the application to the gas turbine power generation facility or the like, the magnetic bar needs to be longer in the axial direction. When the magnetic gear device is driven, torque acts not only on the magnetic gear but also on the magnetic bar. When the transmission torque required for the magnetic gear device is very large as in the case of application to a gas turbine power generation device, the torque acting on the magnetic bar is also very large. However, the magnetic bar has to be a cantilever support mechanism due to restrictions on the positional relationship between the inner ring magnetic gear and the outer ring magnetic gear, and it is difficult to provide a holding mechanism in the axial intermediate portion of the magnetic bar. Therefore, it becomes difficult to maintain the posture against the weight and torque, and there is a concern about distortion of the magnetic bar and interference with the magnetic gear.

  On the other hand, in the magnetic gear device 100 of the present embodiment, the magnets 3 and 5 are provided on the magnetic force generating surfaces of the input side magnetic gear 2 and the output side magnetic gear 6 which are opposed to each other, and the magnet 3 and the magnet 5 are magnetically pivoted. Since it is configured to mesh in the direction, there is no need to press the magnet from the counter gear side, and the magnets 3 and 5 and the magnetic path member 4 according to the size of the holding mechanism for restraining the magnets 3 and 5 against the centrifugal force. The restriction of the distance between them becomes smaller. Therefore, it is possible to suppress deterioration in transmission efficiency and transmittable torque due to an increase in size (increase in diameter) of the input-side and output-side magnetic gears 2 and 6 and an increase in the size of the magnet holding mechanism accompanying high-speed rotation.

  Moreover, since the magnetic path member 4 can be disposed between the opposing surfaces of the input side magnetic gear 2 and the output side magnetic gear 6 in the axial direction by the above configuration, the magnetic gear device support 8 can be used from the outer circumferential direction between the magnetic gears. The magnetic path member 4 can be held. As a result, the distance between the support 8 and the other end where the magnetic path member 4 is not held can be kept shorter than the distance between the one end and the other end of the magnetic bar held by the holding mechanism in the conventional magnetic gear device. In addition, it is possible to obtain a sufficient holding force with respect to the torque acting on the magnetic path member 4, and to suppress the occurrence of distortion and breakage of the magnetic bar.

  Furthermore, since the transmission of torque between the input side magnetic gear 2 and the output side magnetic gear 6 is made non-contact, no lubricating oil or the like is required, leading to cost reduction and improved reliability.

  Further, when an excessive torque is applied between the input side magnetic gear 2 and the output side magnetic gear 6, the magnetic engagement between the magnet 3 and the magnet 5 slips, and the magnetic gear device 100 and the entire gas turbine generator are Failure can be prevented.

  A second embodiment of the present invention will be described with reference to FIG.

  In this embodiment, instead of the plurality of magnets 3 in the first embodiment, magnet groups constituted by a plurality of magnets are arranged side by side in the circumferential direction, and magnets constituting a pair of adjacent magnet groups are arranged. It is a Halbach array.

  FIG. 7 representatively shows two adjacent magnet groups 10 and 11 out of a plurality of magnet groups provided in a ring around the axis on the magnetic force generation surface of the input side magnetic gear 2 according to the present embodiment. It is the figure which looked at the magnet groups 10 and 11 from the radial direction outer side. The vertical direction in the figure corresponds to the axial direction, and the horizontal direction corresponds to the circumferential direction.

  In FIG. 7, the magnet group 10 is configured by a plurality (for example, three) of magnets 10 a to 10 c (for example, permanent magnets), and the magnet group 11 is a plurality of (for example, three) magnets 11 a to 11 c (for example, permanent). Magnet).

  In the magnet group 10, the magnet 10a has an N pole in the downward direction and an S pole in the upward direction. Similarly, the magnet 10b has an N pole in the downward direction in the drawing and an S pole in the upward direction, and is disposed adjacent to the upper side of the magnet 10a in the drawing. The magnet 10c has an N pole in the lower left direction in the figure and an S pole in the upper right direction, and is disposed adjacent to the upper side in the figure of the magnet 10b. In the magnet group 11, the magnet 11a has an N pole in the upward direction and an S pole in the downward direction. Similarly, the magnet 11b has an N pole in the upper direction in the drawing and an S pole in the lower direction, and is disposed adjacent to the upper side of the magnet 11a in the drawing. The magnet 11c has an N pole in the upper left direction in the figure and an S pole in the lower right direction, and is disposed adjacent to the upper side in the figure of the magnet 11b. Moreover, the magnet group 10 and the magnet group 11 are arrange | positioned adjacent to the left-right direction (circumferential direction) in the figure, and magnet 11a-11c is arrange | positioned adjacent to the right side in the figure of magnet 10a-10c, respectively. Yes.

  Thus, paying attention to adjacent magnet groups, each of the magnets 10a to 10c and 11a to 11c is arranged with the direction of the magnetic pole aligned with the lines of magnetic force generated from the adjacent magnets. An arrangement of magnets that reinforce each other's magnetic force in this way is called a Halbach arrangement.

  On the magnetic force generating surface of the input-side magnetic gear 2, a magnet group in which each magnet forms a Halbach array together with adjacent magnet groups such as magnet groups 10 and 11 is provided in an annular shape around the axis of the input rotary shaft 1, When viewed from the axial direction (lower side in the figure), the magnetic poles of each magnet group are arranged so that N poles and S poles are alternately arranged in the circumferential direction.

  Other configurations are the same as those of the first embodiment.

  Also in the present embodiment configured as described above, the same effects as those of the first embodiment can be obtained.

  In addition, since the plurality of magnet groups 10 and 11 are provided on the magnetic force generating surface of the input side magnetic gear 2, the magnetic engagement between the input side magnetic gear 2 (magnet groups 10 and 11) and the output side magnetic gear 6 (magnet 5). Becomes stronger and the transmittable torque of the magnetic gear device 100 can be improved.

  In the present embodiment, the magnet group 10 is configured by the six magnets 10a to 10f. However, the present invention is not limited to this, and a magnet group in which seven or more or five or less magnets are arranged in a Halbach array may be used. good. In the magnet groups 10 and 11, magnets whose magnetic poles are inclined with respect to the axial direction are used for the magnets 10 c and 11 c, but these may be replaced with magnets similar to the magnets 10 b and 11 b, for example.

  Further, in the present embodiment, the case where the magnet groups 10 and 11 are used instead of the magnet 3 of the input side magnetic gear 2 has been described as an example. However, the present invention is not limited to this, for example, the magnet 5 of the output side magnetic gear 6. Instead, a magnet group having the same configuration as the magnet groups 10 and 11 may be used. Of course, a Halbach arrangement of magnets may be applied to both the input side magnetic gear 2 and the output side magnetic gear 6. In these cases, similar effects can be obtained.

  A third embodiment of the present invention will be described with reference to FIGS.

  This embodiment is an example in which a plurality of magnets are concentrically arranged on the magnetic force generation surfaces of the input side and output side magnetic gears 2 and 6. Although there is no particular limitation on the number of magnet rows, in the present embodiment, the magnets 3 and 5 provided in an annular shape on the respective magnetic force generation surfaces of the input and output side magnetic gears 2 and 6 in the first embodiment. A case where magnets are arranged in a further annular shape on the inner peripheral side of the is illustrated.

  FIG. 8 is a cross-sectional view in a vertical plane including the axis of the rotation shafts 1 and 7 of the magnetic gear device 102 according to the present embodiment, and FIG. 9 is a DD of the magnetic gear device 102 in FIG. It is line sectional drawing. In the figure, the same members as those shown in FIGS. 1 and 4 are denoted by the same reference numerals, and description thereof is omitted.

  The magnetic gear device 102 is disposed between the input-side magnetic gear 2 and the output-side magnetic gear 6, and the substantially disk-shaped input-side magnetic gear 2 and output-side magnetic gear 6 that are disposed so that one surface faces each other. A plurality of magnetic path members 4, 22, a support 8 for fixing the plurality of magnetic path members 4 in a ring shape, a support 23 for fixing the magnetic path member 22 in a ring shape inside the magnetic path member 4, and the support 8 are illustrated. It has the board part 9 fixed with respect to the foundation which does not.

  On the magnetic force generating surface of the input side magnetic gear 2, a plurality of magnets 3 (for example, permanent magnets) are provided in an annular shape around the axis of the input rotary shaft 1, and a plurality of magnets 20 (for example, permanent magnets) are concentrically formed inside thereof. Magnet) is provided in an annular shape. The same applies to the output side magnetic gear 6, and a plurality of magnets 5 (for example, permanent magnets) are provided around the axis of the output rotation shaft 7 on the magnetic force generation surface of the output side magnetic gear 6. A plurality of magnets 21 (for example, permanent magnets) are provided in an annular shape concentrically inside. In the input side magnetic gear 2 and the output side magnetic gear 6, the distance (radius) from the axis to each magnet 20 and the distance (radius) to each magnet 21 are the same. The magnets 20 and 21 are formed in a trapezoidal shape in which a cross section cut by a plane including the axis of the input rotary shaft 1 and the output rotary shaft 7 is reduced in diameter toward the magnetic path member 22. Similarly to the magnets 3 and 5, the magnets 20 and 21 are arranged so that the magnetic poles are directed in the axial direction. When viewed from the axial direction, the N poles and the S poles are alternately arranged in the circumferential direction. Yes.

  A plurality of magnetic path members 4 (for example, twelve) are provided between the magnetic force generation surfaces of the input side magnetic gear 2 and the output side magnetic gear 6 and are arranged around the axis and in an annular shape around the axis. It is fixed by the support 8. Similarly, a plurality of (for example, twelve) magnetic path members 22 are provided between the magnetic force generation surfaces of the input side magnetic gear 2 and the output side magnetic gear 6, and the magnetic path member 4 and the magnetic path member 4 are disposed inside the magnetic path member 4. They are arranged concentrically and are fixed to the support 8 by the support 23.

  The support 23 is formed of a nonmetallic and nonmagnetic material such as bakelite or epoxy resin, and is fixed to the inner peripheral side of the support 8. The tip of the magnetic path member 4 protruding from the support 8 is engaged with the outer peripheral portion of the support 23, and the magnetic path member 22 is fixed to the inner peripheral portion of the support 23.

  The magnetic path member 22 is a rod-shaped member. Although the cross-sectional shape is not limited, For example, it has cross-sectional shapes, such as a rectangle (square) and a circle. One end of the magnetic path member 22 is connected (embedded) to the inner peripheral portion of the support 23 and the other end is arranged in the radial direction. The plurality of magnetic path members 22 are arranged at equal intervals on the inner periphery of the support 23. That is, the plurality of magnetic path members 22 are annularly arranged around the axis, and are arranged at equal intervals in the circumferential direction.

  The distance (radius) from the axis to each magnetic path member 22 is set to be the same as the distance (radius) from the axis to the magnet 20 or 21, and therefore the magnetic path member 22 is connected to the magnet 20. It arrange | positions so that it may be located between the magnets 21. FIG.

  The magnetic path member 22 is formed by laminating silicon steel plates whose surfaces are insulated in the circumferential direction or the radial direction. Thereby, the eddy current which generate | occur | produces by the change of the magnetic field of the rotating shafts 1 and 7 direction can be suppressed. When importance is attached to the strength against the circumferential rotational torque load generated by the magnetic field from the magnets 20, 21, the magnetic path member 22 may be formed by laminating silicon steel plates in the axial direction.

  Gaps are provided between the magnet 20 and the magnetic path member 22 provided on the magnetic force generation surface of the input side magnetic gear 2 and between the magnet 21 and the magnetic path member 22 and are disposed in a non-contact manner. The magnetic path member 22 transmits a magnetic field between the magnet 20 and the magnet 21 to each other, and the magnet 20 and the magnet 21 are magnetically engaged with each other via the magnetic path member 22.

  As in the first embodiment, the relationship between the rotational speed of the input rotary shaft 1 (input-side magnetic gear 2) of the magnetic gear device 102 and the rotational speed of the output rotary shaft 7 (output-side magnetic gear 6) is as follows. , 5 is determined by the ratio of the number of members. Further, the number ratio of the magnets 3, 5 and the number ratio of the magnets 20, 21 are made the same, and the number of the magnets 3, 5, 20, 21 is determined. Thus, by determining the number of the magnets 3, 5, 20, and 21, the input / output speed determined by the ratio of the input / output rotational speed determined by the ratio of the number of the magnets 3, 5 and the ratio of the number of the magnets 20, 21 is determined. The relationship between the rotational speeds becomes the same, and torque can be efficiently transmitted from the input side magnetic gear 2 to the output side magnetic gear 6.

  Other configurations are the same as those of the first embodiment.

  In the present embodiment configured as described above, the same effect as in the first embodiment can be obtained, and the magnetic engagement between the input side magnetic gear 2 and the output side magnetic gear 6 by the amount of additional magnets. Power can be increased and power transmission efficiency can be improved.

  A fourth embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, the width of a magnet arranged annularly on the magnetic force generation surface is increased in the radial direction.

  10 is a cross-sectional view of the magnetic gear device 103 according to the present embodiment in a vertical plane including the axis of the rotation shafts 1 and 7, and FIG. 11 is an EE view of the magnetic gear device 103 of FIG. FIG. In the figure, the same members as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

  In the magnetic gear device 103, a plurality of magnets 30 (for example, permanent magnets) are annularly provided on the magnetic force generation surface of the input side magnetic gear 2. The magnet 30 is expanded in the radial direction as compared with the magnet 3 in the first embodiment. In this case, even if the number of magnets is the same, the area of the surface that generates the magnetic force is larger than that of the first embodiment, which is advantageous in enhancing the generated magnetic force from the magnetic force generation surface. Although not shown, a plurality of magnets 31 are similarly provided in an annular shape on the magnetic force generation surface of the output-side magnetic gear 6 and are expanded in the radial direction as compared with the magnet 5 in the first embodiment. Although not shown, the magnetic path member 4 also has a shape extended (expanded) in the radial direction so as to be positioned between the magnet 30 and the magnet 31.

  Other configurations are the same as those of the first embodiment.

  In the present embodiment configured as described above, the same effects as those of the first embodiment can be obtained.

  Further, the transmittable torque can be increased without changing the number of magnets provided on the magnetic force generating surfaces of the input side and output side magnetic gears 2 and 6.

  A fifth embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, the magnets 3 and 5 provided on the magnetic force generating surfaces of the input side and output side magnetic gears 2 and 6 of the first embodiment include the axis of the input rotary shaft 1 and the output rotary shaft 7. The case where the cross-sectional shape cut | disconnected by the plane to perform is a rectangle is shown.

  FIG. 12 is a cross-sectional view in a vertical plane including the axis of rotation shafts 1 and 7 of the magnetic gear device 104 according to the present embodiment. In the figure, the same members as those shown in FIG.

  In FIG. 12, a plurality of magnets 40 (for example, permanent magnets) are provided on the magnetic force generating surface of the input side magnetic gear 2. Although not shown, the magnet 40 is provided in an annular shape around the axis of the input rotary shaft 1 in the same manner as the magnet 3 in the first embodiment. A plurality of magnets 41 (for example, permanent magnets) are provided on the magnetic force generation surface of the output side magnetic gear 6. Although not shown, the magnet 41 is the same as the magnet 40 and is provided in an annular shape around the axis of the output rotation shaft 7.

  The magnets 40 and 41 are fixed by being fitted into magnet fixing grooves provided around the axis and in an annular shape around the axis on the magnetic force generation surfaces of the input side magnetic gear 2 and the output side magnetic gear 6. The magnets 40 and 41 and the magnet fixing groove are formed in a rectangle (including a square) in a cross section cut along a plane including the axis of the input rotary shaft 1 and the output rotary shaft 7. Therefore, it is possible to easily insert and incorporate them from the magnetic path member 4 side of the input side and output side magnetic gears 2 and 6.

  Further, the input side and output side magnetic gears 2 and 6 include magnet support parts 42 and 43 that restrain the movement of the magnets 40 and 41 in the axial direction, respectively. The magnetic gears 2 and 6 are fixed.

  The magnet support parts 42 and 43 are made of a nonmagnetic and nonmetallic material.

  Other configurations are the same as those of the first embodiment.

  In the present embodiment configured as described above, the same effects as those of the first embodiment can be obtained. In the case of the magnetic gear device of the present invention, since the magnet is embedded in the surface of the magnetic gear that faces in the axial direction, the centrifugal force acting on the magnet does not act in the direction toward the counterpart gear. Therefore, even when the magnet can be attached and detached from the axial direction as in the present embodiment and the magnet is pressed from the axial direction, the magnet support parts 42 and 43 and the fixing screw 44 that hold the magnet are not so strong. Not required. Therefore, the thickness of the magnet pressing structure can be suppressed, and the distance between the input side magnetic gear 2 and the output side magnetic gear 6 with respect to the magnetic path member 4 can be kept within an allowable range.

  A sixth embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, an electromagnet is used instead of the magnet (permanent magnet) in the first embodiment. In the present embodiment, the same members as those shown in FIG.

  FIG. 13 is a cross-sectional view in a vertical plane including the axis of rotation shafts 1 and 7 of magnetic gear device 105 according to the present embodiment. In the figure, the same members as those shown in FIG.

  In FIG. 13, the input-side magnetic gear 2 includes a plurality of electromagnets 55, an electric wire 54 that transmits current to the electromagnet 55, a commutator 53 that is provided on the input rotary shaft 1 and is connected to the electromagnet 55 by the electric wire 54, A contactor (brush) 52 that contacts the commutator 53 and transmits current, an electric wire 51 connected to the contactor 52, an electric wire 51, and the electric wire 51, the contactor 52, the commutator 53, and the electric wire 54. And a power supply 50 for supplying a current to the electromagnet 55.

  The electromagnet 55 is fitted and fixed in a magnet fixing groove provided around the axis and in an annular shape around the axis on the magnetic force generating surface of the input side magnetic gear 2. The electromagnet 55 is arranged so as to generate a magnetic force (magnetic field) in the axial direction when a current is supplied from the power supply 50, and the magnetic poles when viewed from the axial direction are N and S in the circumferential direction. The poles are arranged alternately. When no current is supplied from the power supply 50 to the electromagnet 55, the electromagnet 55 does not generate a magnetic force.

  Other configurations are the same as those of the first embodiment.

  In the present embodiment configured as described above, the same effects as those of the first embodiment can be obtained.

  Further, since the magnet disposed in the input side magnetic gear 2 is the electromagnet 55, the generation of the magnetic field of the electromagnet 55 can be stopped by cutting off the current supplied from the power source 50 to the electromagnet 55, and the input side magnetic gear 2 can be stopped. Transmission of torque to the output side magnetic gear 6 can be stopped. For example, when a problem occurs on the output side of the magnetic gear device 105, torque transmission is stopped by stopping the supply of current from the power supply 50, and an emergency stop of the gas turbine can be quickly handled. it can.

  In this embodiment, the input side magnetic gear 2 is provided with the electromagnet 55 as a magnet. However, the present invention is not limited to this. The magnet 5 provided on the output side magnetic gear 6 is an electromagnet, and the output rotating shaft 7 is provided with a commutator. 53, an electric wire 54, and the like, and power may be supplied from the power source 50 via the contactor 52 and the electric wire 51. Even in this case, the same effect as that of the fifth embodiment can be obtained.

It is sectional drawing in the vertical plane containing the axial center line of the rotating shaft of the magnetic gear apparatus by the 1st Embodiment of this invention. It is an AA arrow directional view of the magnetic gear apparatus shown in FIG. It is a BB arrow directional view of the magnetic gear apparatus shown in FIG. It is CC sectional view taken on the line of the magnetic gear apparatus shown in FIG. It is the figure which looked at the magnetic gear apparatus shown in FIG. 1 from the rotating shaft direction. It is a block diagram of the gas turbine generator provided with the magnetic gear apparatus which concerns on the 1st Embodiment of this invention. It is a figure at the time of seeing the state which made the magnet the Halbach arrangement | sequence from the radial direction outer side. It is sectional drawing in the vertical plane containing the axis line of the rotating shaft of the magnetic gear apparatus by the 2nd Embodiment of this invention. It is the DD sectional view taken on the line of the magnetic gear apparatus shown in FIG. It is sectional drawing in the vertical plane containing the axial center line of the rotating shaft of the magnetic gear apparatus by the 3rd Embodiment of this invention. It is the EE arrow directional view of the timing gear apparatus shown in FIG. It is sectional drawing in the vertical plane containing the axial center line of the rotating shaft of the magnetic gear apparatus by the 4th Embodiment of this invention. It is sectional drawing in the vertical plane containing the axial center line of the rotating shaft of the magnetic gear apparatus by the 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100,102,103,104 Magnetic gear apparatus 1 Input rotation shaft 2 Input side magnetic gears 3, 5, 20, 21, 30, 31, 40, 41 Magnet 4, 22 Magnetic path member 6 Output side magnetic gear 7 Output rotation shaft 8, 23 Support 9 Plate portion 10, 11 Magnet group 42, 43 Magnet support component 44 Magnet support component fixing screw 50 Power source 51, 54 Electric wire 52 Contactor 53 Commutator 55 Electromagnet 90 Compressor 91 Combustor 92 Turbine 93 Intermediate shaft 94 Generator 95 Journal bearing

Claims (10)

An input-side magnetic gear having a plurality of magnets arranged in an annular shape around the axis of the input rotation shaft and having a magnetic force generation surface directed in the axial direction;
An output side magnetic gear provided coaxially with the input side magnetic gear and having a plurality of magnets arranged annularly around the axis of the output rotation shaft and facing the magnetic force generation surface of the input side magnetic gear;
Made of electromagnetic steel fixed annularly so as to be interposed between the magnets of the input side magnetic gear and the output side magnetic gear between the magnetic force generating surfaces of the input side magnetic gear and the output side magnetic gear facing each other. A plurality of magnetic path members;
A magnetic gear device comprising: a fixing portion that is provided on a magnetic force generation surface of the input side magnetic gear and the output side magnetic gear, and that restrains the magnet from at least a radially outer side of each magnetic gear. The magnetic gear device according to claim 1,
The magnetic gear device, wherein the input side magnetic gear, the magnets of the output side magnetic gear, and the magnetic path member are arranged in a plurality of rows concentrically around an axis. The magnetic gear device according to claim 1,
At least one magnet of the input side magnetic gear and the output side magnetic gear is a magnet group composed of a plurality of magnets, respectively. The magnetic gear device according to claim 3, wherein
The magnetic gear device according to claim 1, wherein the magnet group has a Halbach arrangement in which each magnet is arranged with a magnetic pole face directed in a direction of a line of magnetic force assumed. The magnetic gear device according to claim 1,
The magnet is formed in a trapezoidal shape in which a cross section cut by a plane including the rotation shaft is reduced in diameter toward the magnetic path member, and a hypotenuse of the cross section is constrained by the fixing portion. Magnetic gear characterized by. The magnetic gear device according to claim 1,
A magnetic gear device comprising a support made of a non-magnetic material and restraining the axial movement of the magnet. The magnetic gear device according to claim 1,
The magnetic gear device is characterized in that the magnetic path member is composed of silicon steel plates laminated in a circumferential direction or a radial direction. The magnetic gear device according to claim 1,
A magnetic gear device comprising a fixing member that is made of a non-magnetic material and fixes the magnetic path member. The magnetic gear device according to claim 1,
The magnetic gear device, wherein the magnet is a permanent magnet or an electromagnet.   2. The magnetic gear device according to claim 1, wherein the magnet is composed of magnets laminated in a circumferential direction or a radial direction.

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