Method for manufacturing magnetic modulator, magnetic modulator, and magnetic modulation gear

Abstract

To obtain suitable output performance.SOLUTION: A method for manufacturing a magnetic modulator 50 comprises: a punching step of punching an electromagnetic steel sheet S into the planar shape of a magnetic pole piece 54 to produce a plurality of steel sheet pieces 54a; a stacking step of stacking the plurality of steel sheet pieces 54a to produce a plurality of magnetic pole pieces 54; a disposition step of disposing the plurality of magnetic pole pieces 54 on a peripheral surface of a cylindrical jig 70; and a molding step of performing resin molding so that the plurality of magnetic pole pieces 54 supported on the jig 70 are connected in a circumferential direction with resin. The peripheral surface of the jig 70 is formed with a plurality of recessed parts 70a into which the plurality of magnetic pole pieces 54 individually fit.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a magnetic modulation body, a magnetic modulation body, and a magnetic modulation gear.

Background Art

[0002] Conventionally, a magnetic modulation gear is known in which a plurality of magnetic pole pieces are arranged between two magnet rotors arranged on the inner and outer circumferences to modulate the magnetic flux distribution between the two magnet rotors.

[0003] The plurality of magnetic pole pieces are arranged at equal intervals in the circumferential direction. For example, in the magnetic modulation gears described in Patent Documents 1 and 2, a structure in which magnetic pole pieces (magnetic materials) and non-magnetic materials are alternately arranged in the circumferential direction is adopted. However, such a structure causes an increase in the number of parts and complication of the manufacturing process. Therefore, a structure may be adopted in which a plurality of magnetic pole pieces and a connecting portion (bridge portion) therebetween are formed of an integral magnetic material.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when a magnetic material integral with the magnetic pole piece is used as the connecting portion, the output performance such as torque and efficiency deteriorates due to the leakage magnetic flux passing through the connecting portion.

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to obtain suitable output performance.

Means for Solving the Problems

[0007] The present invention relates to a method for manufacturing a magnetic modulation body, a punching step of punching an electromagnetic steel sheet into a planar shape of a magnetic pole piece to produce a plurality of steel sheet pieces, a stacking step of stacking the plurality of steel sheet pieces to produce a plurality of magnetic pole pieces, an arranging step of arranging the plurality of magnetic pole pieces on the circumferential surface of a cylindrical jig, a molding step of resin-molding the plurality of magnetic pole pieces supported by the jig so as to be connected in the circumferential direction with resin, comprising: a plurality of recesses into which the plurality of magnetic pole pieces are individually fitted are formed on the circumferential surface of the jig.

Effect of the Invention

[0008] According to the present invention, suitable output performance can be obtained.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0011] [Overall Configuration of Magnetic Modulation Gear] FIG. 1 is a cross-sectional view of a magnetic modulation gear 1 according to the present embodiment. In the following description, the direction along the central axis Ax of the magnetic modulation gear 1 is referred to as the "axial direction", the direction perpendicular to the central axis Ax is referred to as the "radial direction", and the rotational direction around the central axis Ax is referred to as the "circumferential direction". Also, among the axial directions, the side connected to the external driven member (the left side in the figure) is referred to as the "output side", and the opposite side (the right side in the figure) is referred to as the "input side".

[0012] As shown in FIG. 1, the magnetic modulation gear 1 according to the present embodiment includes a casing (frame) 10, an input side cover 20 and an output side cover 30 that cover both axial sides of the casing 10, and an input shaft 40 and a magnetic modulation body 50 whose main parts are housed therein.

[0013] The casing 10 is formed in a substantially cylindrical shape centered on the central axis Ax, and has a stator yoke 11 and an outer pole magnet 12 on its inner peripheral portion. The stator yoke 11 is formed in a cylindrical shape and is fitted inside the casing 10. The outer pole magnet 12 has more pole numbers than the inner pole magnet 41a of the input shaft 40 described later, and a plurality of outer pole magnets with different polarities are attached to the inner peripheral surface of the stator yoke 11 so as to be alternately arranged in the circumferential direction. However, the outer pole magnet 12 may be an integral ring shape, or may be a plurality of divided ones arranged in the circumferential direction. Also, among the inner peripheral portion of the casing 10, a bearing 61 (for example, a ball bearing) that rotatably supports the magnetic modulation body 50 is arranged on the input side of the stator yoke 11.

[0014] The input side cover 20 is arranged on the input side of the casing 10 and covers the inner opening of the casing 10 from the input side. The outer peripheral portion of the input side cover 20 is fitted with the casing 10 by an inlay. Also, a bearing 62 (for example, a ball bearing) that rotatably supports the input shaft 40 is arranged on the inner peripheral portion of the input side cover 20.

[0015] The output-side cover 30 is disposed on the output side of the casing 10 and covers the inner opening of the casing 10 from the output side. The outer peripheral portion of the output-side cover 30 is fitted with the casing 10 by an inlay. Further, a bearing 63 (for example, a ball bearing) for rotatably supporting the magnetic modulation body 50 is disposed on the inner peripheral portion of the output-side cover 30.

[0016] The input shaft 40 is a shaft that rotates around the central axis Ax and includes a disk portion 41 and a motor connection portion 42. This input shaft 40 is rotatably supported by a bearing 62 disposed between the input-side cover 20 and a bearing 64 disposed between the magnetic modulation body 50. The disk portion 41 has an inner pole magnet 41a disposed on the inner diameter side of the outer pole magnet 12 on its outer peripheral portion. This inner pole magnet 41a is a permanent magnet such as a neodymium magnet, and a plurality of magnets having different polarities are attached to the outer peripheral surface of the disk portion 41 so as to be alternately arranged in the circumferential direction. However, the inner pole magnet 41a may be an integral ring shape, or may be a plurality of divided ones arranged in the circumferential direction. The motor connection portion 42 extends axially from the disk portion 41 to the input side. The tip side of the motor connection portion 42 protrudes outside from the input-side cover 20, and this protruding portion is connected to a motor (not shown).

[0017] [Configuration of Magnetic Modulation Body] FIG. 2 is a cross-sectional view of the magnetic modulation body 50, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1. As shown in FIGS. 1 and 2, the magnetic modulation body 50 has an output shaft portion 51 and a cylindrical portion 52.

[0018] The output shaft portion 51 is a metal shaft that rotates around the central axis Ax. Approximately half of the output side of the output shaft portion 51 protrudes outside from the output-side cover 30, and this protruding portion is connected to a driven member (not shown). In the substantially central portion of the output shaft portion 51 in the axial direction, it is rotatably supported by a bearing 63 disposed between the output side cover 30. Further, a bearing 64 (for example, a ball bearing) that rotatably supports the input shaft 40 is disposed at the end portion on the input side of the output shaft portion 51. At the outer peripheral portion of the axial position between the bearing 63 and the bearing 64 in the output shaft portion 51, the end portion on the output side of the cylindrical portion 52 is connected.

[0019] The cylindrical portion 52 is formed in a substantially cylindrical shape centered on the central axis Ax and has a plurality of magnetic pole pieces 54 disposed at axial positions corresponding to the outer pole magnet 12 and the inner pole magnet 41a. As shown in FIG. 3, the plurality of magnetic pole pieces 54 are arranged at predetermined intervals in the circumferential direction and are formed in an annular shape as a whole. The plurality of magnetic pole pieces 54 are arranged concentrically on the inner diameter side of the outer pole magnet 12 and on the outer diameter side of the inner pole magnet 41a with a predetermined gap therebetween. Each magnetic pole piece 54 is configured by laminating thin electromagnetic steel sheets (laminated steel sheets) in the axial direction. The number of magnetic pole pieces 54 is (outer pole pole pairs ± inner pole pole pairs), and generally is (outer pole pole pairs + inner pole pole pairs). The outer pole pole pairs refer to the pole pairs of the outer pole magnet 12, and the inner pole pole pairs refer to the pole pairs of the inner pole magnet 41a.

[0020] Adjacent magnetic pole pieces 54 in the circumferential direction are connected by a connecting portion 54b therebetween. The connecting portion 54b is made of resin and constitutes a part of a resin portion 56 described later. The outer peripheral surface of the connecting portion 54b is recessed inward in diameter from the outer peripheral surface of the magnetic pole piece 54. However, at least one of the inner peripheral surface and the outer peripheral surface of the connecting portion 54b may be recessed more than the magnetic pole piece 54. In this case, the other surface may be flush with the corresponding surface of the magnetic pole piece 54.

[0021] When the input shaft 40 rotates around the central axis Ax, the magnetic pole piece 54 modulates the spatial magnetic flux waveform formed by the inner pole magnet 41a at the same frequency as the outer pole magnet 12. Then, rotational torque is transmitted to the magnetic modulation body 50 using the magnetic force between the magnetic pole piece 54 and the outer pole magnet 12. The reduction ratio in this case is (the number of magnetic pole pieces 54 / the number of pairs of inner pole magnet poles). At this time, mainly radial forces due to the inner pole magnet 41a and the outer pole magnet 12 act on the magnetic pole piece 54. In this way, the rotational motion input to the input shaft 40 is decelerated and output to a driven member (not shown) connected to the output shaft portion 51 of the magnetic modulation body 50.

[0022] As shown in FIG. 2, a bearing support ring 55 made of metal (e.g., stainless steel) is disposed at the input-side end of the cylindrical portion 52. The bearing support ring 55 is fixed to the outer peripheral portion of the cylindrical portion 52, and the inner ring of the bearing 61 disposed between the bearing support ring 55 and the casing 10 is fitted to the outer peripheral surface (see FIG. 1). The portion of the cylindrical portion 52 excluding the magnetic pole piece 54 and the bearing support ring 55 is a resin portion 56 made of resin (e.g., super engineering plastic). Resin is also filled between the plurality of magnetic pole pieces 54, and this portion constitutes the above-described connecting portion 54b. The output-side end of the resin portion 56 projects toward the inner diameter side and is connected to the output shaft portion 51. A plurality of convex portions 57 protruding toward the inner diameter side are arranged in the circumferential direction on the inner peripheral portion of this end. The plurality of convex portions 57 are formed corresponding to the plurality of concave portions 51a on the outer peripheral surface of the output shaft portion 51. By the engagement of these convex portions 57 and the concave portions 51a, the output shaft portion 51 and the cylindrical portion 52 (resin portion 56) are firmly fixed, and mutual movement in the radial and axial directions is suppressed.

[0023] [Manufacturing Process of Magnetic Modulation Body] FIG. 4 is a flowchart showing a schematic manufacturing process (manufacturing method) of the magnetic modulation body 50, and FIGS. 5 to 7 are diagrams for explaining the manufacturing process of the magnetic modulation body 50. FIG. 8 is a diagram for explaining a modified example of the magnetic pole piece 54. In FIG. 5, the shape of the magnetic pole piece 54 (steel plate piece) is simplified to a rectangular shape instead of a fan shape.

[0024] As shown in FIG. 4, in the manufacturing process of the magnetic modulation body 50, first, the magnetic pole pieces 54 are punched out one by one from an electromagnetic steel sheet (step S1). Specifically, a sheet-shaped electromagnetic steel sheet S is punched out in the planar shape (shape viewed from the axial direction) of the magnetic pole piece 54 to produce a required number of steel sheet pieces 54a (FIG. 5(a)). The punching of the steel sheet pieces 54a is arranged so that there is less wasted space on the electromagnetic steel sheet S.

[0025] At this time, the orientation of the steel sheet pieces 54a is set such that the radial direction of the magnetic modulation gear 1 substantially coincides with the rolling direction RD of the electromagnetic steel sheet S. Thereby, the performance of the magnetic modulation gear 1 can be improved. That is, the electromagnetic steel sheet S has different magnetic properties in the rolling direction RD and the orthogonal direction WD orthogonal to this on the main surface, and the magnetic permeability in the rolling direction RD is higher (magnetic flux is more likely to pass) than in the orthogonal direction WD. Therefore, by making the orientation of the steel sheet pieces 54a corresponding to the radial direction of the magnetic modulation gear 1 substantially coincide with the rolling direction RD of the electromagnetic steel sheet S, the magnetic flux passing through the magnetic pole piece 54 can be preferably made uniform. As a result, it is possible to suppress torque reduction, reduce torque ripple and iron loss, etc. More precisely, the orientation of the steel sheet pieces 54a corresponding to the radial direction of the magnetic modulation gear 1 (magnetic modulation body 50) may be made to substantially coincide (correspond) with the rolling direction of the (isotropic) electromagnetic steel sheet. Note that the same effect can be obtained by making the orientation of the steel sheet pieces 54a corresponding to the radial direction of the magnetic modulation gear 1 correspond to the easy magnetization direction of the grain-oriented electromagnetic steel sheet. Also, in the plurality of magnetic pole pieces 54 (or each magnetic pole piece 54), by making the relationship of the orientation with the rolling direction RD uniform, the variation in magnetic properties can be suppressed compared to those in which this is not uniform.

[0026] Next, the magnetic pole pieces 54 (steel sheet pieces 54a) punched out from the electromagnetic steel sheet S in step S1 are laminated by a predetermined axial length (step S2; FIG. 5(b)). In this way, the required number of magnetic pole pieces 54 is produced.

[0027] Next, the plurality of magnetic pole pieces 54 are arranged in a forming jig 70 (step S3; FIG. 6(a)). The jig 70 of this embodiment supports the outer diameter portion of the magnetic pole piece 54 in the magnetic modulation body 50 and is formed in a cylindrical shape. A plurality of recesses 70a for supporting the outer diameter portions of the plurality of magnetic pole pieces 54 are formed on the inner peripheral surface of the jig 70. In this step, the plurality of magnetic pole pieces 54 are fitted into the recesses 70a of the jig 70. Thereby, the plurality of magnetic pole pieces 54 are properly positioned and arranged in an annular shape as a whole.

[0028] Next, the plurality of magnetic pole pieces 54 are connected by resin molding (step S4; FIG. 6(b)). In this step, first, the previously prepared output shaft portion 51 and the bearing support ring 55 are arranged in a mold for integrally resin-molding with the plurality of magnetic pole pieces 54 and positioned. The mold in this case may be the jig 70 or may be separate from the jig 70. Then, the mold including the jig 70 is filled with resin, and the resin portion 56 is molded (such as resin casting or injection molding). Thereafter, by removing the jig 70, a magnetic modulation body 50 in which the plurality of magnetic pole pieces 54, the output shaft portion 51, and the bearing support ring 55 are fixed (integrated) with the required positional accuracy by the resin portion 56 is obtained (FIG. 6(c)). The outer peripheral surface of the magnetic modulation body 50 corresponds to the inner peripheral surface shape of the jig 70, and the resin connection portion 54b is recessed more than the magnetic pole piece 54.

[0029] Next, finishing processing is performed (step S5). In this step, the output shaft portion 51 and the bearing support ring 55 are processed. Both the output shaft portion 51 and the bearing support ring 55 are machined to a predetermined finished shape. Also, if necessary, the inner peripheral surface and the outer peripheral surface of the magnetic pole piece 54 may be finished. The outer peripheral surface may be processed so that the magnetic pole piece 54 and the connection portion 54b are flush. Note that this finishing processing is not limited to machining with a lathe or a polishing machine, and may include heat treatment, surface treatment, manual polishing, etc. Thus, the magnetic modulation body 50 in which the plurality of magnetic pole pieces 54, the output shaft portion 51, and the bearing support ring 55 are integrally connected by the resin portion 56 is completed.

[0030] Note that the shaping jig used in step S3 only needs to be able to position a plurality of magnetic pole pieces 54, and is not limited to a jig that supports the outer diameter portion of the magnetic pole piece 54. For example, as shown in FIG. 7(a), a jig 71 that supports the inner diameter side of the magnetic pole piece 54 may be used. A plurality of recesses 71a for supporting the inner diameter portions of the plurality of magnetic pole pieces 54 are formed on the outer peripheral surface of the jig 71, and resin molding is performed in a state where the magnetic pole pieces 54 are fitted into the recesses 71a. In this case, as shown in FIG. 7(b), the inner peripheral surface of the obtained magnetic modulation body 50 has a resin connecting portion 54b recessed more than the magnetic pole piece 54 corresponding to the outer peripheral surface shape of the jig 71. The jig 71 may be configured to be removable in the axial direction after molding, or may be in a half-split shape, a three-piece wedge shape, or the like. Alternatively, as shown in FIG. 7(c), the jig 70 and the jig 71 may be used in combination. In this case, in the obtained magnetic modulation body 50, the resin connecting portions 54b are recessed more than the magnetic pole pieces 54 on both the inner peripheral surface and the outer peripheral surface. The jig 70 that supports the outer diameter portion of the magnetic pole piece 54 can hold the magnetic pole piece 54 more firmly than the jig 71 that supports the inner diameter portion. Therefore, the jig 70 that supports the outer diameter portion can perform the pitch setting (positioning) in the circumferential direction more accurately, and can also easily suppress the movement of the magnetic pole piece 54 due to the shrinkage of the resin during resin cooling. Further, when only one of the inner peripheral portion and the outer peripheral portion of the magnetic pole piece 54 is supported by the jig 70 or the jig 71, the circumferential surface on the other side not supported by the jig may be supported by the cylindrical surface of another positioning jig. In this case, the connecting portion 54b and the magnetic pole piece 54 on the circumferential surface on the other side are formed flush. Further, the recess of the jig for supporting (holding) the magnetic pole piece 54 during molding may be only a part of the magnetic pole piece 54, rather than the entire axial length. In this case, in a part of the axial direction, a completed shape is obtained in which the connecting portion 54b is recessed more than the magnetic pole piece 54.

[0031] Further, the planar shape (shape seen from the axial direction) of the magnetic pole piece 54 is not limited to a fan shape or a square shape. For example, at least one of the circumferential surfaces (surfaces substantially orthogonal to the circumferential direction) of the magnetic pole piece 54 may have irregularities. In this case, the shape, position, etc. of the irregularities are not particularly limited. For example, as shown in FIG. 8(a), it may be a recessed portion 54d in which the circumferential surface is gently recessed as a whole, or as shown in FIG. 8(b), it may have a recessed portion 54e along the tangential direction. Alternatively, as shown in FIG. 8(c), it may have a convex portion 54f along the circumferential direction. Thus, by providing irregularities on the circumferential surface of the magnetic pole piece 54, the connection between the magnetic pole piece 54 and the connecting portion 54b can be strengthened. As described above, a radial force by a magnet acts on the magnetic pole piece 54. By providing irregularities (recessed portion 54d, recessed portion 54e, convex portion 54f) on the circumferential surface, detachment of the magnetic pole piece 54 from the connecting portion 54b due to the radial force can be suppressed. From the viewpoint of suppressing magnetic flux leakage, a recessed portion is more preferable than a convex portion.

[0032] [Technical effects of this embodiment] As described above, according to this embodiment, a plurality of magnetic pole pieces 54 are circumferentially connected by a resin-made connecting portion 54b. Thereby, compared with the case where a magnetic material integrated with the magnetic pole piece 54 is used as the connecting portion, magnetic flux leakage through the connecting portion can be reduced. Therefore, suitable output performance can be obtained. Further, at the time of molding the connecting portion 54b, a plurality of magnetic pole pieces 54 are individually fitted into a plurality of recesses 70a formed on the circumferential surface of the jig 70, and resin molding is performed. Thereby, a plurality of magnetic pole pieces 54 can be suitably positioned and the connecting portion 54b can be molded. Moreover, since the plurality of magnetic pole pieces 54 are punched out from the electromagnetic steel sheet S in a state where they are not connected, the magnetic pole pieces 54 (steel sheet pieces 54a) can be arranged on the electromagnetic steel sheet S without waste (see FIG. 5(a)). Therefore, compared with the case of punching out a plurality of magnetic pole pieces connected to the connecting portion from the electromagnetic steel sheet as shown in FIG. 9, the scrap amount of the electromagnetic steel sheet can be reduced.

[0033] Further, according to the present embodiment, in the punching step of step S1 of punching out the electromagnetic steel sheet S into the planar shape of the magnetic pole piece 54 to produce a plurality of steel sheet pieces 54a, the orientation of the steel sheet piece 54a corresponding to the radial direction in the magnetic modulation body 50 is made to correspond to the rolling direction of the electromagnetic steel sheet S. Since the electromagnetic steel sheet S has a higher magnetic permeability (easier for magnetic flux to pass through) in the rolling direction RD than in the orthogonal direction WD, by making the radial orientation of the steel sheet piece 54a correspond to the rolling direction of the electromagnetic steel sheet S, the magnetic flux passing through the magnetic pole piece 54 can be suitably made uniform. Thereby, suppression of torque reduction, reduction of torque ripple and iron loss, etc. can be achieved, and the performance of the magnetic modulation gear 1 can be improved.

[0034] Further, according to the present embodiment, the magnetic pole piece 54 has irregularities on at least one of the circumferential surfaces. Thereby, on the circumferential surface, the connection between the magnetic pole piece 54 and the connecting portion 54b can be strengthened. Therefore, even when a radial force by a magnet acts on the magnetic pole piece 54, detachment etc. from the connecting portion 54b of the magnetic pole piece 54 can be suppressed.

[0035] [Others] As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above embodiments. For example, in the above embodiment, the outer pole magnet 12 is used as the stator, and the output is taken out from the magnetic modulation body 50 having the magnetic pole piece 54. However, it is also possible to fix the magnetic pole piece 54, provide the outer pole magnet 12 on a rotatable low-speed rotor, and take out the output from the low-speed rotor.

[0036] Also, in the above embodiment, it is preferable to prepare a plurality of types of jigs for holding the magnetic pole pieces in an annular shape during molding, with different numbers of magnetic pole pieces. In this case, the shape of each magnetic pole piece, that is, the shape of the concave portion of the jig, may be made common. Thereby, by simply using the jigs properly, a magnetic modulation body with a different number of magnetic pole pieces can be easily manufactured.

[0037] In addition, the details shown in the above embodiments can be appropriately changed without departing from the gist of the invention.

Explanation of reference numerals

[0038] 1 Magnetic modulation gear 12 Outer pole magnet 41a Inner pole magnet 50 Magnetic modulation body 51 Output shaft part 52 Cylindrical part 54 Magnetic pole piece 54a Steel plate piece 54b Connecting part 54d, 54e Concave part 54f Convex part 55 Bearing support ring 56 Resin part 70, 71 Jig 70a, 71a Concave part Ax Central axis S Electromagnetic steel sheet RD Rolling direction WD Orthogonal direction

Claims

1. a punching process for producing a plurality of steel sheet pieces by punching out an electromagnetic steel sheet into a planar shape of a magnetic pole piece; a lamination step of laminating the plurality of steel plate pieces to produce a plurality of magnetic pole pieces; a placement step of placing the plurality of magnetic pole pieces on a peripheral surface of a cylindrical jig; a molding step of resin-molding the plurality of magnetic pole pieces supported by the jig so that the magnetic pole pieces are connected in a circumferential direction by resin; Equipped with A plurality of recesses into which the plurality of magnetic pole pieces are individually fitted are formed on the peripheral surface of the jig. A method for manufacturing a magnetic modulator.

2. In the punching step, the direction of the steel sheet pieces corresponding to the radial direction of the magnetic modulation body is set to correspond to the rolling direction of the electromagnetic steel sheet. A method for producing the magnetic modulator according to claim 1.

3. The pole piece has irregularities on at least one of its circumferential faces. A method for producing the magnetic modulator according to claim 1.

4. After the molding step, a machining step is provided in which a connecting portion that connects adjacent pole pieces in a circumferential direction and a peripheral surface of the pole pieces are machined to be flush with each other. A method for producing the magnetic modulator according to claim 1.

5. The rotor comprises a plurality of magnetic pole pieces arranged in a circumferential direction, and a resin connecting portion that connects adjacent magnetic pole pieces in the circumferential direction, At least one of an inner circumferential surface and an outer circumferential surface of the connecting portion is recessed from the pole piece. Magnetic modulation body.

6. On the inner circumferential surface, the magnetic pole piece and the connecting portion are flush with each other, On the outer circumferential surface, the connecting portion is recessed more than the pole piece. The magnetic modulator according to claim 5 .

7. The pole piece has irregularities on at least one of its circumferential faces. The magnetic modulator according to claim 5 .

8. A magnetic modulation body manufactured by the method for manufacturing a magnetic modulation body according to any one of claims 1 to 4, an input shaft having a plurality of inner pole magnets arranged in a circumferential direction and disposed on an inner diameter side of the plurality of magnetic pole pieces; A plurality of outer pole magnets arranged on the outer diameter side of the plurality of magnetic pole pieces and arranged in a circumferential direction; A magnetic modulation gear.

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