JP2021029069A - Manufacturing method of rotor, and rotary member - Google Patents

Abstract

To provide a manufacturing method of a rotor capable of reducing a weight of a rotary member while maintaining positioning accuracy of permanent magnets.SOLUTION: The present invention relates to a manufacturing method of a rotor comprising a plurality of permanent magnets on an outer peripheral surface of a rotary member. The manufacturing method of the rotor includes: a projection forming step of forming, through laminate molding, a plurality of rows of projections in a circumferential direction of the rotary member, the plurality of projections being disposed in a rotation axis direction of the rotary member; a magnet fixing step of fixing the plurality of permanent magnets between the projections being adjacent in the circumferential direction of the rotary member; and a covering cylinder mounting step of mounting a covering cylinder over outer peripheral surfaces of the permanent magnets.SELECTED DRAWING: Figure 3B

Description

The present invention relates to a method for manufacturing a rotor and a rotating member.

Conventionally, as a kind of electric motor using a permanent magnet for a rotor, an SPM (Surface Permanent Magnet) type electric motor in which a permanent magnet is arranged on an outer peripheral surface of a rotating member (sleeve, rotating shaft, etc.) is known. In the rotor of this electric motor, a technique using a positioning member has been proposed in order to evenly arrange the permanent magnets along the circumferential direction of the rotating member (see, for example, Patent Documents 1 to 3).

JP-A-2017-221024 Japanese Unexamined Patent Publication No. 6-054472 Japanese Unexamined Patent Publication No. 2001-309590

In a rotor provided with a permanent magnet on the outer peripheral surface of the rotating member, it is desired to reduce the weight of the rotating member while maintaining the positioning accuracy of the permanent magnet.

One aspect of the present disclosure is a method for manufacturing a rotor having a plurality of permanent magnets on the outer peripheral surface of the rotating member, wherein a plurality of rows are formed along the circumferential direction of the rotating member, and a plurality of rotors are formed in the rotation axis direction of the rotating member. A convex portion forming step of forming the convex portion to be arranged by laminated molding, a magnet fixing step of fixing the permanent magnet between the convex portions adjacent to the rotating member in the circumferential direction, and an outer peripheral surface of the permanent magnet. It is a method of manufacturing a rotor including a covering cylinder mounting step of mounting a covering cylinder.
Another aspect of the present disclosure is a rotating member to which a plurality of permanent magnets can be fixed on the outer peripheral surface, in which a plurality of permanent magnets are arranged in a plurality of rows along the circumferential direction of the rotating member, and a plurality of permanent magnets are arranged in the rotation axis direction of the rotating member. The width of the convex portion in each row in the arrangement direction is fixed to the outer peripheral surface of the rotating member with respect to the maximum width of the portion distant from the outer peripheral surface of the rotating member in the radial direction. It is a rotating member with a small width of the part.
Yet another aspect of the present disclosure is a rotating member to which a plurality of permanent magnets can be fixed on the outer peripheral surface, which are arranged in a plurality of rows along the circumferential direction of the rotating member and are arranged in a plurality of rows in the rotation axis direction of the rotating member. In the arrangement direction of the convex portions in each row, the ratio of the width of the portion fixed to the outer peripheral surface of the rotating member to the height from the outer peripheral surface of the rotating member is at least 1: It is a rotating member which is 3.

According to one aspect of the present disclosure, the weight of the rotating member can be reduced while maintaining the positioning accuracy of the permanent magnet.

It is sectional drawing explaining the structure of the electric motor 1 in 1st Embodiment. It is an exploded perspective view of a rotor 30. It is a perspective view which shows the convex part formation process of a rotor 30. It is a perspective view which shows the magnet fixing process of a rotor 30. It is a perspective view which shows the convex part removal process of a rotor 30. It is a figure when the rotor 30 of FIG. 3A is seen from the rotation axis direction X. It is a figure when the rotor 30 of FIG. 3B is seen from the rotation axis direction X. It is a figure when the rotor 30 of FIG. 3C is seen from the rotation axis direction X. It is a perspective view of the rotor 30 provided with the sleeve 31A of the 2nd Embodiment. It is a conceptual diagram which shows the shape of the convex part 36A of 3rd Embodiment. It is a conceptual diagram which shows the shape of the convex part 36B of 3rd Embodiment. It is a conceptual diagram which shows the shape of the convex part 36C of 3rd Embodiment. It is a conceptual diagram which shows the shape of the convex part 36D of 3rd Embodiment. It is a conceptual diagram which shows the shape of the convex part 36E of 3rd Embodiment. It is a perspective view of the rotor 30 provided with the sleeve 31B of the first modified form. It is a figure which saw the rotor 30 from the rotation axis direction X. It is a perspective view of the rotor 30 provided with the sleeve 31C of the second modified form. It is a perspective view of the rotor 30 provided with the sleeve 31D of the third modified form.

Hereinafter, embodiments of the present disclosure will be described. The drawings attached to the present specification are all schematic drawings, and the shape, scale, aspect ratio, etc. of each part are changed or exaggerated from the actual product in consideration of ease of understanding. Further, in the drawings, hatching indicating a cross section of the member is appropriately omitted.
In the present specification and the like, terms that specify the shape, geometric conditions, and the degree thereof, such as "parallel" and "direction", are considered to be almost parallel in addition to the strict meaning of the terms. Includes the range of, which can be regarded as the direction.

(First Embodiment)
First, the electric motor 1 including the rotor 30 of the first embodiment will be described.
FIG. 1 is a cross-sectional view illustrating the configuration of the electric motor 1 according to the first embodiment. The configuration of the electric motor 1 shown in FIG. 1 is an example, and any configuration may be used as long as the rotor 30 of the present embodiment can be applied.

In FIG. 1 and the like, a coordinate system in which X and Y are orthogonal to each other is shown. In this coordinate system, the rotation axis direction of the electric motor 1 is the X direction, the radial direction is the Y direction, and the circumferential direction is the R direction. The rotation axis direction, radial direction, and circumferential direction of the electric motor 1 coincide with the rotation axis direction, radial direction, and circumferential direction of the rotor 30, which will be described later.
Further, in the present specification and the like, the line serving as the rotation center of the rotation axis 35, which will be described later, is referred to as "rotation axis S", and the direction along the rotation axis S is also referred to as "rotation axis direction X". The "rotation axis S" and "rotation axis direction X" are also applied to each part constituting the rotor, for example, the sleeve 31, the permanent magnet 32, the covering cylinder 33, etc., which will be described later. In the present specification and the like, the direction parallel to the above-mentioned rotation axis S is the X direction, and the rotation axis direction is also appropriately referred to as "rotation axis direction X".

As shown in FIG. 1, the electric motor 1 includes a frame 10, a stator 20, and a rotor 30.
The frame 10 is an exterior member of the electric motor 1, and includes a frame main body 11, a shaft hole 12, and a bearing 13.
The frame body 11 is a housing that surrounds and holds the stator 20. The frame body 11 holds the rotor 30 via the bearing 13. The frame main body 11 includes a supply port 14, a discharge port 15, and a hole 16. The supply port 14 is an opening for supplying the refrigerant to the flow path 23 (described later) of the stator frame 22, and is connected to the refrigerant supply pipe (not shown). The discharge port 15 is an opening for discharging the refrigerant flowing through the flow path 23, and is connected to a refrigerant discharge pipe (not shown). The hole 16 is an opening for passing the power line 27 drawn from the iron core 21.
The shaft hole 12 is a hole through which the rotating shaft 35 (described later) penetrates. The bearing 13 is a member that rotatably supports the rotating shaft 35.

The stator 20 is a composite member that forms a rotating magnetic field for rotating the rotor 30. The stator 20 is formed in a cylindrical shape as a whole and is fixed inside the frame 10. The stator 20 includes an iron core 21 and a stator frame 22.

The iron core 21 is a member to which the winding 26 can be attached to the inside. The iron core 21 is formed in a cylindrical shape, and is arranged inside the stator frame 22 in the stator 20. A plurality of grooves (not shown) are formed on the inner surface of the iron core 21, and the winding 26 is attached to these grooves. A part of the winding 26 protrudes from both ends of the iron core 21 in the axial direction (X direction) of the iron core 21. The iron core 21 is integrated by joining, for example, a laminated body in which a plurality of thin plates such as electromagnetic steel plates are stacked by bonding, bolting, caulking, or the like.

The stator frame 22 is a member that holds the iron core 21 inside. The stator frame 22 is formed in a cylindrical shape. As will be described later, the iron core 21 is joined to the stator frame 22 by a welded portion (not shown). As shown in FIG. 1, the stator frame 22 of the present embodiment is provided with a flow path 23 for cooling the heat transferred from the iron core 21 on the outer surface. The flow path 23 is a single-row or multi-row spiral groove formed on the outer surface of the stator frame 22. The refrigerant (not shown) supplied from the supply port 14 of the frame body 11 (frame 10) circulates in the flow path 23 along the outer surface of the stator frame 22 in a spiral shape, and then is discharged from the frame body 11. It is discharged to the outside from the outlet 15.

Examples of the material constituting the stator frame 22 include carbon steel, steel for electromagnetic steel sheets, stainless steel and the like. The stator frame 22 may be made of any material as long as it can be welded to the iron core 21. Further, the inner peripheral side to be joined to the iron core 21 by welding may be made of an iron material, and the outer peripheral side may be made of a non-iron material. The stator frame 22 and the iron core 21 are not limited to being joined by welding, but may be joined by, for example, shrink fitting.

A power line 27 electrically connected to the winding 26 is drawn from the iron core 21 of the stator 20. The power line 27 is connected to a power supply device (not shown) installed outside the electric motor 1. During operation of the electric motor 1, for example, a three-phase alternating current is supplied to the iron core 21 to form a rotating magnetic field for rotating the rotor 30.

The rotor 30 is a component that rotates by magnetic interaction with a rotating magnetic field formed by the stator 20. The rotor 30 is provided on the inner peripheral side of the stator 20.
The rotating shaft 35 is a member that supports the rotor 30. The rotating shaft 35 is inserted so as to penetrate the shaft center of the rotor 30 and is fixed to the rotor 30. The rotating shaft 35 is rotatably supported by a bearing 13 provided on the frame 10. Further, the rotating shaft 35 penetrates the shaft hole 12 and is connected to a power transmission mechanism, a speed reduction mechanism, etc. (not shown) installed outside. Details of the configuration of the rotor 30 will be described later.

In the electric motor 1 shown in FIG. 1, when a three-phase alternating current is supplied to the stator 20 (iron core 21), the rotor 30 is caused by a magnetic interaction between the stator 20 and the rotor 30 in which a rotating magnetic field is formed. A rotational force is generated in, and the rotational force is output to the outside via the rotation shaft 35.

Next, the configuration of the rotor 30 will be described.
FIG. 2 is an exploded perspective view of the rotor 30. As shown in FIG. 2, the rotor 30 includes a sleeve (rotating member) 31, a permanent magnet 32, and a covering cylinder 33.
The sleeve 31 is a substantially cylindrical member in which a plurality of permanent magnets 32 are fixed to the outer peripheral surface, and is provided on the outer peripheral side of the rotating shaft 35 (see FIG. 1). The sleeve 31 is made of a magnetic material such as carbon steel. The rotor 30 having the sleeve 31 on the inner peripheral side is fitted to the outer periphery of the rotating shaft 35 by tightening.

The permanent magnets 32 are members that generate a magnetic field, and as shown in FIG. 2, 12 rows of permanent magnets 32 are provided along the circumferential direction R (see FIG. 4B) on the outer peripheral side of the sleeve 31 (in FIG. 2, the front side). The sequence on the side is shown). In the rotor 30 in the circumferential direction R of the sleeve 31, rows of permanent magnets 32 for the north pole and rows of permanent magnets 32 for the south pole are alternately arranged. As will be described later, the permanent magnet 32 is attached to and fixed to the outer peripheral surface of the sleeve 31 with an adhesive. In the present embodiment, an example is shown in which the permanent magnets 32 in each row are divided into two along the rotation axis direction X of the rotor 30, but the permanent magnets 32 are three or more along the longitudinal direction of the rotor 30. It may or may not be divided.

The covering cylinder 33 is a cylindrical member for covering a plurality of permanent magnets 32. The covering cylinder 33 is attached to the outer peripheral surface of the permanent magnet 32 arranged on the sleeve 31. By mounting the covering cylinder 33 on the outer peripheral surface of the permanent magnet 32, it is possible to prevent the permanent magnet 32 from falling off from the rotor 30 due to the centrifugal force generated by the rotation of the rotor 30.

Next, a method of manufacturing the rotor 30 will be described.
3A to 3C are perspective views showing a manufacturing process of the rotor 30. 4A to 4C are side views showing a manufacturing process of the rotor 30. 4A to 4C are views of the rotor 30 viewed from the rotation axis direction X, and correspond to FIGS. 3A to 3C.

First, as shown in FIG. 3A, a convex portion 36 is formed on the outer peripheral surface of the sleeve 31 by laminating molding (convex portion forming step). The convex portion 36 is a protrusion that serves as a guide for positioning the permanent magnet 32. In the present embodiment, as shown in FIG. 4A, the convex portions 36 are formed in 12 rows along the circumferential direction R of the sleeve 31. Further, as shown in FIG. 3A, the convex portions 36 are arranged at four positions along the rotation axis direction X of the sleeve 31 in each row. The number of rows of the convex portions 36 in the circumferential direction of the sleeve 31 is set based on the number of rows of the permanent magnets 32 fixed to the sleeve 31. Similarly, the number of arrangements of the convex portions 36 in the rotation axis direction X of the sleeve 31 is set based on the number of divisions of the permanent magnet 32, the length in the longitudinal direction, and the like.

In the sleeve 31 of the present embodiment, the convex portion 36 is formed in a substantially cylindrical shape. The height at which the convex portion 36 protrudes from the outer peripheral surface of the sleeve 31 is, for example, the same as or about half the thickness of the permanent magnet 32. In this embodiment, as shown in FIG. 4A, an example is shown in which the height at which the convex portion 36 protrudes from the outer peripheral surface of the sleeve 31 is set to about half the thickness of the permanent magnet 32.

The convex portion 36 is formed of a material containing a metal powder as a main component. In order to laminate and form the convex portion 36 using metal powder as a main component, for example, a metal 3D printer compatible with SLM (Selective Laser Melting), EBM (Electron Beam Melting), DED (Directed Energy Deposition), etc. can be used. it can.
In this embodiment, an example in which the convex portion 36 has a cylindrical shape is shown, but the shape of the convex portion 36 is not limited. The convex portion 36 may have, for example, a triangular prism shape, a square prism shape, a semi-cylindrical shape, or the like.

Next, as shown in FIGS. 3B and 4B, the permanent magnet 32 is fixed between the convex portions 36 adjacent to the circumferential direction R of the sleeve 31 (magnet fixing step). Of the four convex portions 36 (36a to 36d), the convex portions 36a and 36b serve as guides for positioning the two permanent magnets 32a adjacent to the circumferential direction R. Further, the convex portions 36c and 36d serve as guides for positioning two permanent magnets 32b adjacent to each other in the circumferential direction R.

The permanent magnet 32 is attached to the outer peripheral surface of the sleeve 31 with an adhesive, and is fixed by curing the adhesive. In the sleeve 31 of the present embodiment, the convex portion 36 is provided on the outer peripheral surface of the sleeve 31 by laminating molding in the convex portion forming step. Therefore, the operator can accurately and evenly arrange the permanent magnets 32 on the outer peripheral surface of the sleeve 31 by fitting the permanent magnets 32 between the convex portions 36 adjacent to the circumferential direction R.

Next, as shown in FIGS. 3C and 4C, the convex portion 36 is removed from the outer peripheral surface of the sleeve 31 to which the permanent magnet 32 is fixed (convex portion removing step). For example, the convex portion 36 can be removed from the outer peripheral surface of the sleeve 31 by cutting using an end mill or the like. As a result, a sleeve 31 in which the permanent magnet 32 is fixed to the outer peripheral surface is obtained.
Next, as shown in FIG. The covering cylinder 33 is mounted on the outer peripheral surface of the permanent magnet 32 fixed to the sleeve 31 (covering cylinder mounting step).
The rotor 30 can be completed by going through the above steps.

According to the method for manufacturing the rotor 30 of the first embodiment described above, the convex portion 36 formed on the outer peripheral surface of the sleeve 31 serves as a guide for positioning the permanent magnet 32, so that the operator is adjacent to the circumferential direction R. By fitting the permanent magnets 32 between the convex portions 36, the permanent magnets 32 can be accurately and evenly arranged on the outer peripheral surface of the sleeve 31. Further, since the convex portion 36 is partially formed on the outer peripheral surface of the sleeve 31, the weight of the sleeve 31 can be reduced as compared with the method of forming a groove on the entire outer peripheral surface of the sleeve 31 by machining. Therefore, in the rotor 30 manufactured by the manufacturing method of the first embodiment, the weight of the sleeve (rotating member) 31 can be reduced while maintaining the positioning accuracy of the permanent magnet 32.

Further, according to the method for manufacturing the rotor 30 of the first embodiment, the weight of the sleeve 31 can be further reduced because the convex portion 36 is removed from the sleeve 31 after the permanent magnet 32 is fixed to the outer peripheral surface of the sleeve 31. .. By reducing the weight of the sleeve 31 in this way, the inertia (moment of inertia) of the rotor 30 can be reduced. Therefore, in the electric motor 1 provided with the rotor 30 of the first embodiment, the time required for acceleration / deceleration can be further shortened.

According to the method for manufacturing the rotor 30 of the first embodiment, when the permanent magnets 32 are arranged on the outer peripheral surface of the sleeve 31, a jig for arranging the permanent magnets 32 at equal intervals is not required, and the sleeve Since the manufacturing time can be shortened as compared with the method of forming the groove on the outer peripheral surface of 31, the manufacturing cost can be reduced. Further, when a groove is formed on the outer peripheral surface of the sleeve 31, both sides in the width direction of the groove are shaped like banks, so that extra work for removing excess adhesive is required. Moreover, if the adhesive is not completely removed, the weight balance of the rotor 30 is lost, which causes vibration during rotation. On the other hand, according to the rotor 30 of the first embodiment, since the pair of convex portions 36 are formed at positions separated from each other in the longitudinal direction of the permanent magnet 32 (see, for example, FIG. 3B), the peripheral direction R The space between the two adjacent permanent magnets 32 can be used to easily remove excess adhesive. Therefore, in the rotor 30 obtained by the manufacturing method of the first embodiment, the weight balance is less likely to be lost, and the generation of vibration during rotation can be suppressed.

(Second Embodiment)
FIG. 5 is a perspective view of the rotor 30 provided with the sleeve 31A of the second embodiment. FIG. 5 shows a state in which the permanent magnet 32 and the convex portion 36 are arranged on the outer peripheral surface of the sleeve 31.
As shown in FIG. 5, in the rotor 30 of the second embodiment, the permanent magnets 32 in each row are divided into three parts. Further, the permanent magnets 32 in each row are arranged along an oblique direction (hereinafter, also referred to as “arrangement direction S1”) with respect to the rotation axis direction X of the sleeve 31A. In each row, the permanent magnets 32 adjacent to the arrangement direction S1 are arranged so as to be displaced in parallel along the direction S2 substantially orthogonal to the rotation axis direction X. In the present embodiment, the permanent magnets 32 adjacent to the arrangement direction S1 are arranged so that their long sides are continuous with each other. That is, in each row, the permanent magnets 32 are arranged along the arrangement direction S1 with respect to the rotation axis direction X of the sleeve 31, and in the circumferential direction, are parallel to the direction S2 substantially orthogonal to the rotation axis direction X. Moreover, the long sides are arranged so as to be continuous.

In the second embodiment, the convex portions 36 are arranged at six positions in each row so as to be displaced in parallel along the direction S2 substantially orthogonal to the rotation axis direction X of the sleeve 31A. In each row, the convex portions 36a and 36b serve as guides for positioning two permanent magnets 32a adjacent in the circumferential direction at one end of the rotation axis direction X. Further, the convex portions 36c and 36d serve as guides for positioning two permanent magnets 32c adjacent to each other in the circumferential direction at the center of the rotation axis direction X. Further, the convex portions 36e and 36f serve as guides for positioning two permanent magnets 32b adjacent to each other in the circumferential direction at the other end in the rotation axis direction X.

(Third Embodiment)
6A to 6E are conceptual diagrams showing the shape of the convex portion 36 of the third embodiment. 6A to 6E are views corresponding to the cross sections taken along line I-I shown in FIG. 4A.
FIG. 6A shows an example in which the shape of the convex portion 36A is an isosceles triangle whose base is a portion separated from the outer peripheral surface of the sleeve 31 to the outside in the radial direction Y. FIG. 6B shows an example in which the shape of the convex portion 36B is a right triangle whose base is a portion separated from the outer peripheral surface of the sleeve 31 to the outside in the radial direction Y. FIG. 6C shows an example in which the shape of the convex portion 36C is an inverted L shape. FIG. 6D shows an example in which the shape of the convex portion 36D is a regular quadrangle. The convex portion 36D shown in FIG. 6D is fixed to the outer peripheral surface of the sleeve 31 at the corner portion of the regular quadrangle.

The convex portions 36A to 36D shown in FIGS. 6A to 6D are the widths of the portions fixed to the outer peripheral surface of the sleeve 31 with respect to the maximum width W1 of the portions radially outward from the outer peripheral surface of the sleeve 31. It is configured so that W2 becomes smaller.
FIG. 6E shows an example in which the shape of the convex portion 36E is a vertically long rectangle. In the convex portion 36E shown in FIG. 6E, the maximum width W1 of the portion radially outward from the outer peripheral surface of the sleeve 31 and the width W2 of the portion fixed to the outer peripheral surface of the sleeve 31 are the same. In the convex portion 36E shown in FIG. 6E, the ratio of the width W2 of the portion fixed to the outer peripheral surface of the sleeve 31 to the height H from the outer peripheral surface of the sleeve 31 is set to 3.

The convex portions 36A to 36E shown in FIGS. 6A to 6E can be bent by applying a force in the direction of the arrow to break the portion fixed to the outer peripheral surface of the sleeve 31. Therefore, according to the configuration of the third embodiment shown in FIGS. 6A to 6E, the convex portions 36A to 36E can be easily removed from the outer peripheral surface of the sleeve 31.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications and changes can be made as in the modified forms described later, and these are also disclosed in the present disclosure. Included within the technical scope of. Moreover, the effects described in the embodiments are merely a list of the most suitable effects resulting from the present disclosure, and are not limited to those described in the embodiments. The above-described embodiment and the modified form described later may be used in combination as appropriate, but detailed description thereof will be omitted.

(First modified form)
FIG. 7A is a perspective view of the rotor 30 provided with the sleeve 31B of the first modified form. FIG. 7B is a view of the rotor 30 as viewed from the rotation axis direction X. 7A and 7B show the rotor 30 before removing the convex portion 36.
In the rotor 30 of the first modified form, the arrangement of the permanent magnets 32 (32a, 32b) is the same as that of the first embodiment (the same applies to the second and third embodiments described later).

As shown in FIG. 7B, in the sleeve 31B of the first modified form, 24 rows of convex portions 36 are formed along the circumferential direction R of the sleeve 31B. Further, as shown in FIG. 7A, the convex portions 36 are arranged at four positions in each row in parallel with the rotation axis direction X of the sleeve 31B. In the sleeve 31B of the first modified form, the convex portions 36 are formed in two rows, respectively, between two permanent magnets 32 (32a, 32b) adjacent to each other in the circumferential direction R.

In the configuration of the first modification, the arrangement interval of the permanent magnets 32 in the circumferential direction R of the sleeve 31B is the same as that of the first embodiment. Therefore, the diameter of the convex portion 36 of the first modified form is about half that of the first embodiment. Therefore, in the sleeve 31B of the first modified form, the convex portion 36 can be easily removed from the outer peripheral surface of the sleeve 31B after the permanent magnet 32 is fixed. In the first modified form, the convex portions 36 may be formed in three or more rows between two permanent magnets 32 adjacent to each other in the circumferential direction.

FIG. 8 is a perspective view of the rotor 30 provided with the sleeve 31C of the second modified form. FIG. 8 shows the rotor 30 before removing the convex portion 36.
In the sleeve 31C of the second modified form, 12 rows of convex portions 36 are formed along the circumferential direction of the sleeve 31C as in the first embodiment. Further, as shown in FIG. 8, in each row, the convex portions 36 are arranged at three positions parallel to the rotation axis direction X of the sleeve 31C.

In the second modified form, of the three convex portions 36 provided in the row A, the convex portions 36a and 36b serve as guides for positioning the two permanent magnets 32a adjacent in the circumferential direction. Further, the convex portion 36c serves as a guide for positioning two permanent magnets 32b adjacent to each other in the circumferential direction. On the other hand, in the row B adjacent to the row A, the arrangement of the convex portions 36 is opposite to that of the row A. That is, of the three convex portions 36 provided in the row B, the convex portion 36a serves as a guide for positioning the two permanent magnets 32a adjacent in the circumferential direction. Further, the convex portions 36b and 36c serve as guides for positioning two permanent magnets 32b adjacent to each other in the circumferential direction. As described above, in the sleeve 31 of the second modified form, the three convex portions 36 arranged parallel to the rotation axis direction X are configured to be arranged differently every other row.
According to the sleeve 31 of the second modified form, the number of the convex portions 36 can be reduced as compared with the sleeve 31 of the first embodiment, so that the time for removing the convex portions 36 can be shortened.

FIG. 9 is a perspective view of the rotor 30 provided with the sleeve 31D of the third modified form. FIG. 9 shows the rotor 30 before removing the convex portion 36.
In the sleeve 31D of the third modified form, 12 rows of convex portions 36 are formed along the circumferential direction of the sleeve 31D as in the first embodiment. Further, as shown in FIG. 9, the convex portions 36 are arranged at two positions in the row A in parallel with the rotation axis direction X of the sleeve 31D. Further, in the row B adjacent to the row A, the sleeves 31D are arranged at four positions in parallel with the rotation axis direction X.

Of the two convex portions 36 provided in the row A, the convex portion 36a serves as a guide for positioning the two permanent magnets 32a adjacent in the circumferential direction. Further, the convex portion 36b serves as a guide for positioning two permanent magnets 32b adjacent to each other in the circumferential direction. On the other hand, of the four convex portions 36 provided in the row B adjacent to the row A, the convex portions 36a and 36b serve as guides for positioning the two permanent magnets 32a adjacent in the circumferential direction. Further, the convex portions 36c and 36d serve as guides for positioning two permanent magnets 32b adjacent to each other in the circumferential direction. As described above, in the sleeve 31D of the third modified form, the number and arrangement of the convex portions 36 are different for every other row.
Even in the sleeve 31D of the third modified form, the number of the convex portions 36 can be reduced as compared with the sleeve 31 of the first embodiment, so that the time for removing the convex portions 36 can be shortened.

(Other variants)
In the embodiment, an example in which the convex portion 36 is formed on the sleeve 31 by laminated molding has been described, but the sleeve 31 and the convex portion 36 may be formed as an integral structure by laminated molding.
In the embodiment, an example in which the convex portion 36 is formed of a material containing a metal powder as a main component has been described, but the convex portion 36 may be formed of, for example, a material containing a resin powder as a main component.
In the embodiment, an example in which a metal 3D printer is used as a method for laminating the convex portion 36 on the sleeve 31 has been described, but the present invention is not limited to this. As a method for laminating the convex portion 36 on the sleeve 31, for example, a laser direct laminating method (LENS: Laser Engineered Net Shipping) in which a material powder and a laser beam are simultaneously irradiated to melt and laminate an arbitrary portion is used. You can also.

In the embodiment, for example, as shown in FIG. 3B, an example in which the convex portions 36 are arranged at two locations along the longitudinal direction of one permanent magnet 32 has been described, but the convex portions 36 are arranged at two locations along the longitudinal direction of one permanent magnet 32. It may be arranged at three or more places along the longitudinal direction of the magnet.
In the embodiment, an example of removing the convex portion 36 after fixing the permanent magnet 32 on the outer peripheral surface of the sleeve 31 has been described, but the outer peripheral surface of the permanent magnet 32 is covered with a covering cylinder while leaving the convex portion 36 on the sleeve 31. 33 may be attached.
In the embodiment, the sleeve 31 has been described as an example of the rotating member constituting the rotor 30, but the rotating member may be the rotating shaft 35 (see FIG. 1). That is, in the rotor having a configuration in which the permanent magnet 32 is arranged on the outer peripheral side of the rotating shaft 35 without using the sleeve 31, the rotating member is the rotating shaft 35.

1: Electric motor, 30: Rotor, 31, 31A, 31B, 31C, 31D: Sleeve, 32: Permanent magnet, 35: Rotating shaft, 36, 36A, 36B, 36C, 36D, 36E: Convex part

Claims (7)

A method for manufacturing a rotor having a plurality of permanent magnets on the outer peripheral surface of the rotating member.
A convex portion forming step of forming a plurality of rows along the circumferential direction of the rotating member and forming a plurality of convex portions arranged in the rotation axis direction of the rotating member by laminating molding.
A magnet fixing step of fixing the permanent magnet between the convex portions adjacent to each other in the circumferential direction of the rotating member,
The covering cylinder mounting step of mounting the covering cylinder on the outer peripheral surface of the permanent magnet, and
A method of manufacturing a rotor comprising. The convex portion formed by the convex portion forming step is made of a material containing a metal as a main component or a material containing a resin as a main component.
The method for manufacturing a rotor according to claim 1. A convex portion removing step of removing the convex portion from the outer peripheral surface of the rotating member to which the permanent magnet is fixed is included.
The method for manufacturing a rotor according to claim 1 or 2. In the convex portion forming step, the convex portions in each row are formed in a direction parallel to the rotation axis direction of the rotating member.
The method for manufacturing a rotor according to any one of claims 1 to 3. In the convex portion forming step, the convex portions in each row are formed in a direction oblique to the rotation axis direction of the rotating member.
The method for manufacturing a rotor according to any one of claims 1 to 3. A rotating member to which multiple permanent magnets can be fixed to the outer peripheral surface.
It is provided with convex portions that form a plurality of rows along the circumferential direction of the rotating member and are arranged in a plurality of rows in the rotation axis direction of the rotating member.
The width of the convex portion in each row in the arrangement direction is smaller than the width of the portion fixed to the outer peripheral surface of the rotating member with respect to the maximum width of the portion radially outward from the outer peripheral surface of the rotating member. ,
Rotating member. A rotating member to which multiple permanent magnets can be fixed to the outer peripheral surface.
It is provided with convex portions that form a plurality of rows along the circumferential direction of the rotating member and are arranged in a plurality of rows in the rotation axis direction of the rotating member.
In the arrangement direction of the convex portions in each row, the ratio of the width of the portion fixed to the outer peripheral surface of the rotating member to the height from the outer peripheral surface of the rotating member is 3 or more.
Rotating member.

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