JP2022155164A - Manufacturing method of rotor - Google Patents

Abstract

To provide a manufacturing method of a rotor capable of easily controlling an extension amount of a portion adjacent to a magnet insertion hole for moving the portion adjacent to the magnet insertion hole toward the permanent magnet side so as to press a permanent magnet.SOLUTION: In a manufacturing method of a rotor 100, a permanent magnet 30 is fixed in a magnet insertion hole 41 by plastically deforming a portion 42a of a recess 42 adjacent to the magnet insertion hole 41 on the side of the permanent magnet 30 such that the portion is moved to the permanent magnet 30 side so as to press the recess 42 in a direction (direction toward Z1 side) opposite to a direction in which the recess 42 is recessed (direction toward Z2 side), and cause the portion 42a of the recess 42 on the permanent magnet 30 side (R2 side) presses the permanent magnet 30.SELECTED DRAWING: Figure 11

Description

The present invention relates to a rotor manufacturing method.

2. Description of the Related Art Conventionally, a rotor including a rotor core and permanent magnets fixed to the rotor core is known (see Patent Document 1, for example).

The aforementioned Patent Document 1 discloses a rotor including a rotor core provided with magnet insertion holes along the axial direction, and permanent magnets arranged in the magnet insertion holes of the rotor core. In the rotor described in Patent Document 1, the portion adjacent to the magnet insertion hole of the rotor core is plastically deformed so as to move toward the permanent magnet so that the portion adjacent to the magnet insertion hole presses the permanent magnet. A permanent magnet is fixed in the magnet insertion hole. The plastic deformation of the portion adjacent to the magnet insertion hole is performed by pressing the flat portion adjacent to the magnet insertion hole from the end side in the axial direction of the rotor core to extend (squeeze and expand) the flat portion. .

DE 102011111626 A1

However, in the rotor described in Patent Document 1, the plastic deformation of the portion of the rotor core adjacent to the magnet insertion hole is performed by pressing and extending the flat portion of the rotor core adjacent to the magnet insertion hole. Therefore, it is relatively difficult to control the amount of extension of the portion extended to the permanent magnet side. Therefore, the rotor manufacturing method can easily control the extension amount of the portion adjacent to the magnet insertion hole for moving the portion adjacent to the magnet insertion hole toward the permanent magnet so as to press the permanent magnet. is desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and one object of the present invention is to move the portion adjacent to the magnet insertion hole toward the permanent magnet so as to press the permanent magnet. To provide a method for manufacturing a rotor that can easily control the amount of extension of a portion adjacent to a magnet insertion hole.

To achieve the above object, a rotor manufacturing method according to one aspect of the present invention provides a plurality of first magnets including magnet insertion holes and recesses adjacent to the magnet insertion holes and recessed along the stacking direction. A first electromagnetic steel sheet forming step of forming a steel plate, and after the first electromagnetic steel sheet forming step, a plurality of first electromagnetic steel sheets are laminated such that a plurality of magnet insertion holes and a plurality of recesses are stacked in the lamination direction. a magnet placement step of arranging a permanent magnet in a laminated magnet insertion hole formed by stacking a plurality of magnet insertion holes after the electromagnetic steel sheet lamination step; and a direction in which the recess is recessed after the magnet placement step. presses in the opposite direction, plastically deforming so that the permanent magnet side portion of the concave portion moves toward the permanent magnet so that the permanent magnet side portion of the concave portion presses the permanent magnet, and a magnet fixing step of fixing the permanent magnet to the magnet insertion hole.

In the rotor manufacturing method according to one aspect of the present invention, as described above, the recesses are pressed in a direction opposite to the direction in which the recesses are recessed so that the permanent magnet side of the recesses presses the permanent magnets. , the permanent magnet is fixed in the magnet insertion hole by plastically deforming the portion of the concave portion on the permanent magnet side so as to move toward the permanent magnet side. As a result, pressing the recess in the direction opposite to the direction in which the recess is recessed corresponds to bending the bent object so as to restore it to its original state, so the flat portion is pressed and extended (extended). It is easier to control the amount of extension of the portion that extends toward the permanent magnet side, as compared with the case of collapsing into two. As a result, it is possible to easily control the amount of extension of the portion adjacent to the magnet insertion hole for moving the portion adjacent to the magnet insertion hole toward the permanent magnet so as to press the permanent magnet.

According to the present invention, as described above, it is possible to easily control the amount of extension of the portion adjacent to the magnet insertion hole for moving the portion adjacent to the magnet insertion hole toward the permanent magnet so as to press the permanent magnet. It is possible to provide a rotor manufacturing method capable of

It is a top view showing the composition of the rotor by a 1st embodiment. FIG. 2 is an enlarged plan view of the vicinity of a magnet insertion hole in FIG. 1; Figure 8 is a cross-sectional view along line 800-800 of Figure 2; It is a figure which shows the manufacturing flow of the rotor by 1st Embodiment. It is a figure which shows the magnet insertion hole formation process in the manufacturing flow of the rotor by 1st Embodiment. It is a figure which shows the notch part formation process in the manufacturing flow of the rotor by 1st Embodiment. It is a figure which shows the recessed part formation process in the manufacturing flow of the rotor by 1st Embodiment. FIG. 4 is a diagram showing an electromagnetic steel sheet lamination step in the manufacturing flow of the rotor according to the first embodiment; It is a figure which shows the magnet arrangement|positioning process in the manufacturing flow of the rotor by 1st Embodiment. FIG. 10 is a cross-sectional view taken along line 900-900 of FIG. 9; It is a figure which shows the recessed part formation process in the manufacturing flow of the rotor by 1st Embodiment. FIG. 9 is an enlarged plan view of the vicinity of a magnet insertion hole of a rotor according to a second embodiment; It is a figure which shows the manufacturing flow of the rotor by 2nd Embodiment. It is a figure which shows the recessed part formation process in the manufacturing flow of the rotor by 2nd Embodiment. It is a figure which shows the magnet insertion hole formation process in the manufacturing flow of the rotor by 2nd Embodiment. FIG. 5 is a cross-sectional view showing the configuration of a rotor according to a first modification of the first embodiment; FIG. 7 is a cross-sectional view showing the configuration of a rotor according to a second modification of the first embodiment; FIG. 11 is a cross-sectional view showing the configuration of a rotor according to a third modified example of the first embodiment; FIG. 11 is a cross-sectional view showing the configuration of a rotor according to a fourth modified example of the first embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

[First embodiment]
(Rotor configuration)
The configuration of the rotor 100 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG.

In the following description, the axial direction, radial direction and circumferential direction of the rotor 100 are defined as Z direction, R direction and C direction, respectively. Also, one side and the other side in the Z direction are defined as the Z1 side and the Z2 side, respectively. Also, one side (radial direction inner side) and the other side (radial direction outer side) in the R direction are defined as the R1 side and the R2 side, respectively.

<Overall Configuration of Rotor>
As shown in FIG. 1 , the rotor 100 constitutes part of the rotating electric machine 102 together with the stator 101 . The rotating electric machine 102 is, for example, a motor, a generator, or a motor/generator. Rotor 100 and stator 101 are each formed in an annular shape. Rotor 100 is configured to rotate about rotation axis 90 . Rotor 100 is arranged on the R1 side of stator 101 so that the outer peripheral surface of rotor 100 and the inner peripheral surface of stator 101 face each other in the R direction. That is, the rotor 100 is configured as part of an inner rotor type rotating electric machine 102 .

The rotor 100 has a rotor core 10 and a rotor shaft 20 . The rotor core 10 includes a shaft insertion hole 11 extending in the Z direction (axial direction). The shaft insertion hole 11 is provided in the central portion of the rotor core 10 when viewed in the Z direction. The rotor shaft 20 is arranged inside the shaft insertion hole 11 . Rotor shaft 20 is fixed to rotor core 10 .

The rotor shaft 20 is connected to an engine, an axle, etc. via a rotational force transmission member such as a gear. Rotation of one of rotor core 10 and rotor shaft 20 about rotation axis 90 transmits rotational force to the other of rotor core 10 and rotor shaft 20 . That is, the rotor core 10 and the rotor shaft 20 rotate integrally around the rotation axis 90 . Rotor shaft 20 and rotor core 10 are configured to rotate about rotation axis 90 with respect to stator 101 (see FIG. 1).

The rotor core 10 is formed by laminating a plurality of electromagnetic steel sheets 12 . A laminated magnet insertion hole 13 extending in the lamination direction (Z direction) of the electromagnetic steel plates 12 is formed in the rotor core 10 . Laminated magnet insertion hole 13 is arranged in a portion of rotor core 10 on the R2 side. A plurality of laminated magnet insertion holes 13 are provided in the rotor core 10 . The plurality of laminated magnet insertion holes 13 are arranged at equal angular intervals along the C direction when viewed in the Z direction.

As shown in FIG. 2 , the rotor 100 includes permanent magnets 30 arranged in the laminated magnet insertion holes 13 . That is, the rotary electric machine 102 is configured as an interior permanent magnet motor (IPM motor). The permanent magnet 30 has a rectangular cross section perpendicular to the Z direction. The permanent magnet 30 is configured, for example, such that its magnetization direction (magnetization direction) is the transverse direction.

As shown in FIG. 3 , the multiple electromagnetic steel sheets 12 include multiple first electromagnetic steel sheets 40 and second electromagnetic steel sheets 50 . Each of the plurality of first electromagnetic steel plates 40 includes magnet insertion holes 41 . The plurality of first electromagnetic steel sheets 40 are stacked in the stacking direction (Z direction). Second electromagnetic steel plate 50 includes magnet insertion holes 51 provided at positions corresponding to magnet insertion holes 41 of first electromagnetic steel plate 40 . The second electromagnetic steel sheets 50 are stacked on the Z2 side of the plurality of first electromagnetic steel sheets 40 . Specifically, the second electromagnetic steel sheet 50 is provided only at the end portion 10a of the rotor core 10 on the Z2 side. Although FIG. 3 shows an example in which only one second electromagnetic steel sheet 50 is provided, two or more second electromagnetic steel sheets 50 may be provided. Laminated magnet insertion holes 13 are formed by stacking the plurality of magnet insertion holes 41 of the plurality of first electromagnetic steel sheets 40 and the magnet insertion holes 51 of the second electromagnetic steel sheets 50 .

Each of the plurality of first electromagnetic steel sheets 40 includes a recess 42 adjacent to the magnet insertion hole 41 on the R1 side and recessed along the stacking direction. The recess 42 is recessed toward the Z2 side. In FIG. 3 , the recess in the Z direction of recess 42 is smaller than the thickness of first electromagnetic steel sheet 40 . The recess 42 of the first electromagnetic steel sheet 40 adjacent to the second electromagnetic steel sheet 50 in the Z direction is recessed toward the Z2 side in the recess through hole 52 of the second electromagnetic steel sheet 50 penetrating at a position corresponding to the recess 42 . It is placed in a state where One concave portion 42 is provided for each magnet insertion hole 41 .

Here, in the rotor 100, the concave portion 42 is pressed in a direction (direction toward the Z1 side) opposite to the direction in which the concave portion 42 is recessed (direction toward the Z2 side). ), the permanent magnet 30 is fixed in the magnet insertion hole 41 by pressing the permanent magnet 30 with the plastically deformed portion 42 a on the permanent magnet 30 side. The details of the method for fixing the permanent magnets 30 to the magnet insertion holes 41 will be described later in the manufacturing method of the rotor 100 .

As a result, the permanent magnet 30 side (R2 side) portion 42 a of the concave portion 42 is plastically deformed so as to press the permanent magnet 30 , so that the permanent magnet 30 can be reliably fixed in the magnet insertion hole 41 . can. Further, pressing the concave portion 42 in a direction (direction toward Z1 side) opposite to the direction in which the concave portion 42 is recessed (direction toward Z2 side) corresponds to bending a bent object so as to return it to its original state. Therefore, it is easier to control the amount of extension of the portion extending toward the magnet insertion hole 41 (R2 side) as compared with the case where the flat portion is pressed and extended (collapsed to spread). As a result, when fixing the permanent magnet 30 to the magnet insertion hole 41, the portion 42a on the permanent magnet 30 side (R2 side) of the concave portion 42 is moved to the permanent magnet 30 side so as to press the permanent magnet 30. The amount of extension of the portion adjacent to the magnet insertion hole 41 can be easily controlled.

As shown in FIG. 2, cutout portions 43 are formed on both sides of the recess 42 so as to extend from the magnet insertion hole 41 side (R2 side) toward the side opposite to the magnet insertion hole 41 (R1 side). there is The notch 43 is provided to facilitate plastic deformation of the recess 42 .

(Manufacturing method of rotor)
A method for manufacturing the rotor 100 according to the first embodiment will be described with reference to FIGS. 3 to 11. FIG. For the sake of simplicity, the directions used in the following description of the manufacturing process of the rotor 100 are the same as those used in the above description of the configuration of the rotor 100 .

<First electromagnetic steel sheet forming step>
First, as shown in FIG. 4, in step S10, a first electromagnetic steel sheet forming process for forming the first electromagnetic steel sheet 40 is performed. As shown in FIG. 3, the first electromagnetic steel sheet forming step (S10) includes a magnet insertion hole 41 and a recess 42 adjacent to the magnet insertion hole 41 and recessed along the stacking direction (Z direction). is a step of forming the first electromagnetic steel sheet 40. The magnet insertion hole 41 and the recess 42 are formed by pressing.

In addition to the magnet insertion hole 41 and the recess 42, the first electromagnetic steel sheet forming step (S10) extends from the magnet insertion hole 41 toward the opposite side (R1 side) of the magnet insertion hole 41 on both sides of the recess 42. This is a step of forming a plurality of first electromagnetic steel sheets 40 including cutouts 43 . The notch 43 is formed by press working, like the magnet insertion hole 41 and the recess 42 . As a result, the concave portion 42 is sandwiched between the cutout portions 43, so that the permanent magnet 30 side of the concave portion 42 in the magnet fixing step (S50), which will be described later, is more difficult than when there is no cutout portion 43. The (R2 side) portion 42a can be easily plastically deformed so as to move the permanent magnet 30 side portion 42a of the concave portion 42 toward the permanent magnet 30 side so that the permanent magnet 30 is pressed.

Further, as shown in FIG. 4, the first electromagnetic steel plate forming step (S10) includes a magnet insertion hole forming step (S11), a notch forming step (S12), and a recess forming step (S13). . The magnet insertion hole forming step (S11), the notch forming step (S12), and the recess forming step (S13) are performed in this order.

As shown in FIG. 5, the magnet insertion hole forming step (S11) is a step of forming the magnet insertion hole 41 so as to include the projecting portion 42b projecting toward the inside (R1 side) of the magnet insertion hole 41. As shown in FIG. The projecting portion 42b has a rectangular shape when viewed in the stacking direction (Z direction).

As shown in FIG. 6, in the notch forming step (S12), notches 43 are formed so as to extend from roots 42c on both sides of projecting portion 42b toward the opposite side (R1 side) of magnet insertion hole 41. It is a process to do. That is, the portion on the side (R1 side) opposite to the magnet insertion hole 41 side (R2 side) with respect to the projecting portion 42b is sandwiched between the two cutout portions 43 .

As shown in FIG. 7, the recess forming step (S13) is a step of forming the recess 42 by deforming the portion 42d sandwiched between the notches 43 so as to be recessed in the stacking direction (Z direction). The concave portion 42 is formed by pressing. As a result, only the portion 42d sandwiched between the notches 43 is deformed when forming the recess 42, so the recess 42 can be formed without deforming the magnet insertion hole 41 adjacent to the recess 42.

In the recess forming step (S13), when the portion 42d sandwiched between the cutouts 43 is recessed in the stacking direction (Z direction), the protruding portion 42b is dented by the amount of the recessed portion 42d sandwiched between the cutouts 43. It moves toward the side opposite to the insertion hole 41 (R1 side). In addition, the projecting portion 42b is moved to a position where at least the projecting portion 42b does not overlap the magnet insertion hole 41 (the projecting portion 42b does not project inside the magnet insertion hole 41) when viewed in the stacking direction (Z direction). .

In addition, in the first electromagnetic steel sheet forming step (S10), a plurality of first electromagnetic steel sheets 40 including magnet insertion holes 41 and recesses 42 adjacent to the magnet insertion holes 41 on the radially inner side (R1 side) are formed. It is a process of forming. That is, the first electromagnetic steel plate 40 is formed such that the magnet insertion hole 41 and the recess 42 are arranged in this order toward the radially inner side (R1 side).

As a result, in the magnet fixing step (S50) described later, the direction in which the permanent magnet 30 side (R2 side) portion 42a of the recess 42 presses the permanent magnet 30 is the same as that of the permanent magnet when the rotor 100 (see FIG. 1) rotates. The direction of the centrifugal force applied to 30 is the same radial direction outward (R2 side). As a result, when the rotor 100 rotates, it is possible to prevent the fixation of the permanent magnets 30 from loosening due to the centrifugal force applied to the permanent magnets 30 . In addition, since the magnet insertion hole 41 is provided on the radially outer side (R2 side) of the rotor 100 (see FIG. 1), the concave portion 42 is positioned adjacent to the magnet insertion hole 41 on the radially inner side (R1 side). By being provided, a space for providing the concave portion 42 can be easily secured.

<Second electromagnetic steel sheet forming step>
Next, as shown in FIG. 4, in step S20, a second electromagnetic steel sheet forming step for forming the second electromagnetic steel sheet 50 is performed. As shown in FIG. 3, the second electromagnetic steel sheet forming step (S20) includes a magnet insertion hole 51 and a recess through-hole 52 that penetrates at a position corresponding to the recess 42 in the stacking direction (Z direction). 2 is a step of forming the electromagnetic steel sheet 50 . The magnet insertion hole 51 and the recessed through hole 52 are formed by press working.

<Electromagnetic steel sheet lamination process>
Next, as shown in FIG. 4, in step S30, an electromagnetic steel sheet lamination step of laminating a plurality of first electromagnetic steel sheets 40 is performed. As shown in FIG. 8, the electromagnetic steel sheet stacking step (S30) is a process of stacking a plurality of first electromagnetic steel sheets 40 such that a plurality of magnet insertion holes 41 and a plurality of recesses 42 are stacked in the stacking direction (Z direction). is.

In addition, in the electromagnetic steel sheet lamination step (S30), the second electromagnetic steel sheets 50 are laminated such that the recesses 42 of the plurality of first electromagnetic steel sheets 40 are inserted into the recess through holes 52 of the second electromagnetic steel sheets 50. This is a step of laminating a plurality of first electromagnetic steel sheets 40 and second electromagnetic steel sheets 50 so as to be positioned at the end portion 10a in the direction (Z direction). That is, on the Z2 side of the plurality of first electromagnetic steel sheets 40 that are stacked so that the plurality of recesses 42 recessed on the Z2 side are stacked, the positions of the recesses 42 and the positions of the through holes 52 for recesses are aligned. A second electromagnetic steel sheet 50 including a through hole 52 is laminated. Further, the first electromagnetic steel sheet 40 is not laminated on the Z2 side of the second electromagnetic steel sheet 50 . The number of the second electromagnetic steel sheets 50 positioned at the end portion 10a in the stacking direction (Z direction) may be one, or may be stacked such that a plurality (for example, two) are stacked. In addition, the second electromagnetic steel sheet 50 may be arranged only at one end 10a or the other end 10a in the stacking direction (Z direction). and the other end 10a.

The electromagnetic steel sheet lamination step (S30) is a step of laminating a plurality of first electromagnetic steel sheets 40 from one end side to the other end side in the lamination direction (Z direction). That is, the plurality of first electromagnetic steel sheets 40 and the first electromagnetic steel sheets 40 are arranged so that all of the electromagnetic steel sheets 12 stacked in the stacking direction (Z direction) except for the second electromagnetic steel sheets 50 at the end portion 10a in the stacking direction are the first electromagnetic steel sheets 40. , and the second electromagnetic steel sheet 50 are laminated. As a result, in the rotor core 10 in which the plurality of magnetic steel sheets 12 including the plurality of first magnetic steel sheets 40 are laminated, the plurality of first magnetic steel sheets 40 including the concave portions 42 are laminated over a wide range in the lamination direction (Z direction). can do. As a result, in the magnet fixing step (S50) described later, the permanent magnet 30 side (R2 side) portion 42a of the concave portion 42 is pressed against the permanent magnet 30 over a wide range in the stacking direction (Z direction), thereby 30 can be fixed more firmly.

<Magnet placement process>
Next, as shown in FIG. 4, in step S40, a magnet placement step of placing the permanent magnets 30 in the laminated magnet insertion holes 13 is performed. As shown in FIGS. 9 and 10, the magnet placement step (S40) is a step of placing permanent magnets 30 in laminated magnet insertion holes 13 formed by stacking a plurality of magnet insertion holes 41. FIG. The magnet arrangement step (S40) is a step of arranging the permanent magnets 30 in the laminated magnet insertion holes 13 so that a gap G in the R direction is formed between the laminated magnet insertion holes 13 and the permanent magnets 30. . 9 and 10 show an example in which the permanent magnet 30 is arranged in the central portion of the magnet insertion hole 41 in the R direction. It may be arranged on the R1 side inside, or may be arranged on the R2 side inside the magnet insertion hole 41 .

<Magnet fixing process>
Next, as shown in FIG. 4, in step S50, a magnet fixing step of fixing the permanent magnets 30 to the magnet insertion holes 41 is performed. As shown in FIG. 11, in the magnet fixing step (S50), the concave portion 42 is pressed in a direction (direction toward the Z1 side) opposite to the direction in which the concave portion 42 is recessed (direction toward the Z2 side). The permanent magnet 30 side (R2 side) portion 42a of the concave portion 42 is plastically deformed so as to move toward the permanent magnet 30 side so that the permanent magnet 30 side (R2 side) portion 42a presses the permanent magnet 30. This is the step of fixing the permanent magnets 30 to the magnet insertion holes 41 .

Specifically, the concave portion adjacent to the magnet insertion hole 41 is pressed in a direction opposite to the direction in which the concave portion 42 is depressed (direction toward the Z2 side) (direction toward the Z1 side) to make the concave portion smaller. A portion 42a on the permanent magnet 30 side (magnet insertion hole 41 side) (R2 side) of 42 is plastically deformed so as to move toward the permanent magnet 30 side. Then, when the portion 42a of the recess 42 on the permanent magnet 30 side is plastically deformed so as to move toward the permanent magnet 30 to the position where it presses the permanent magnet 30, the portion 42a of the recess 42 on the permanent magnet 30 side is deformed. presses the permanent magnet 30 . That is, the permanent magnet 30 is fixed in the magnet insertion hole 41 .

As a result, pressing the concave portion 42 in the opposite direction (direction toward the Z1 side) in which the concave portion 42 is recessed (direction toward the Z2 side) is equivalent to bending the bent object back to its original state. Therefore, it is easier to control the amount of extension of the portion extending toward the magnet insertion hole 41 (R2 side) as compared with the case where the flat portion is pressed and extended (collapsed to spread). As a result, the amount of movement of the portion adjacent to the magnet insertion hole 41 is controlled to move the portion 42a on the permanent magnet 30 side (R2 side) of the recess 42 toward the permanent magnet 30 so as to press the permanent magnet 30. can be easily done.

In the magnet fixing step (S50), the permanent magnet 30 side (R2 side) portion 42a of the concave portion 42 is plastically deformed so as to move toward the permanent magnet 30 side so as to fill the gap G in the R direction. , the permanent magnet 30 is fixed in the magnet insertion hole 41 . Specifically, the permanent magnet 30 is pushed by the permanent magnet 30 side portion 42a of the recessed portion 42 moved toward the permanent magnet 30 side, so that the permanent magnet 30 moves away from the recessed portion 42 of the magnet insertion hole 41. side (R2 side). That is, the permanent magnet 30 is sandwiched between the surface of the magnet insertion hole 41 on the opposite side (R2 side) of the recess 42 and the portion 42a of the recess 42 on the permanent magnet 30 side (R2 side). Become. As a result, even when a gap G in the R direction is formed between the laminated magnet insertion hole 13 and the permanent magnet 30 , the permanent magnet 30 side portion 42 a of the concave portion 42 presses the permanent magnet 30 . The portion 42a of the recess 42 on the permanent magnet 30 side can be reliably moved.

In the magnet fixing step (S50), the permanent magnet 30 side (R2 side) portion 42a of the recess 42 inserted into the recess through hole 52 is plastically deformed so as to move toward the permanent magnet 30. , the permanent magnet 30 is fixed in the magnet insertion hole 41 . As a result, after plastically deforming the portion 42a of the recess 42 on the permanent magnet 30 side (R2 side) toward the permanent magnet 30, a recess along the stacking direction (Z direction) of the recess 42 remains. Even in this case, the recessed portion of the recess 42 can be positioned within the recess through-hole 52 . As a result, after the magnet fixing step (S50), there is no need to separately provide a step of removing the recessed portion of the recess 42. FIG. In the magnet fixing step (S50), the concave portion 42 is pressed until the concave portion 42 in the Z direction becomes smaller than the thickness of the first electromagnetic steel plate 40, and the concave portion in the Z direction remains after the magnet fixing step (S50). It is in a state of

In addition, in the magnet fixing step (S50), when pressing the concave portion 42, a pressing device 80 including an upper pressing member 81, a lower pressing member 82, and a pressing member 83 is used. The upper pressing member 81 is arranged on the Z1 side of the rotor core 10 . The lower pressing member 82 is arranged on the Z2 side of the rotor core 10 . Also, the pressing member 83 is connected to the lower pressing member 82 by a spring, and is movable relative to the lower pressing member 82 in the Z direction. The pressure member 83 is arranged on the Z2 side of the concave portion 42 that is recessed toward the Z2 side. Then, while the upper pressing member 81 and the lower pressing member 82 are pressing the rotor core 10 from both sides in the Z direction except for the vicinity of the recess 42 , the rotor core 10 is inserted into the recess through hole 52 of the second electromagnetic steel plate 50 . The concave portion 42 of the first electromagnetic steel sheet 40 that is in contact is pressed toward the Z1 side by the pressing member 83 .

[Second embodiment]
(Rotor configuration)
The configuration of the rotor 200 according to the second embodiment will be described with reference to FIG. 12 . In addition, in the figure, the same code|symbol is attached|subjected to the part similar to the said 1st Embodiment.

As shown in FIG. 12 , rotor 200 includes rotor core 210 . Rotor core 210 includes a plurality of first electromagnetic steel sheets 240 . Each of the plurality of first electromagnetic steel sheets 40 includes a recess 242 adjacent to the magnet insertion hole 41 and recessed along the stacking direction (Z direction).

In the rotor 200, similarly to the first embodiment, the concave portion 242 is pressed in a direction (direction toward the Z1 side) opposite to the direction in which the concave portion 242 is recessed (direction toward the Z2 side). The permanent magnet 30 is fixed in the magnet insertion hole 41 by pressing the permanent magnet 30 with the plastically deformed portion 242a on the permanent magnet 30 side so as to move it toward the magnet 30 side (R2 side).

Unlike the first embodiment, the rotor core 210 does not have notches on both sides of the recess 242 .

Other configurations of the rotor 200 of the second embodiment are the same as those of the rotor 100 of the first embodiment.

(Manufacturing method of rotor)
A method of manufacturing the rotor 200 according to the second embodiment will be described with reference to FIGS. 12 to 15. FIG.

<First electromagnetic steel sheet forming step>
First, as shown in FIG. 13, in step S210, a first electromagnetic steel sheet forming process for forming the first electromagnetic steel sheet 240 is performed. As shown in FIG. 12, in the first electromagnetic steel plate forming step (S210), as in the first embodiment, magnet insertion holes 41 and magnet insertion holes adjacent to the magnet insertion holes 41 along the stacking direction (Z direction) and a plurality of first electromagnetic steel sheets 240 including recesses 242 that are recessed in the same direction. The magnet insertion hole 41 and the recess 242 are formed by pressing.

Further, as shown in FIG. 13, the first electromagnetic steel plate forming step (S210) includes a recess forming step (S211) and a magnet insertion hole forming step (S212). The recess forming step (S211) and the magnet insertion hole forming step (S212) are performed in this order. In addition, in the first electromagnetic steel sheet forming step (S210), unlike the first embodiment, the step of forming notches on both sides of the recess 242 is not performed.

As shown in FIG. 14, in the recess forming step (S211), the portion adjacent to the radially inner side (R1 side) of the portion where the magnet insertion hole 41 is to be formed is recessed in the stacking direction (Z direction). This is the step of forming the concave portion 242 by deforming it as shown in FIG.

As shown in FIG. 15, the magnet insertion hole forming step (S212) is a step of forming the magnet insertion hole 41 in a portion adjacent to the recess 242 on the radially outer side (R2 side). As a result, the magnet insertion hole 41 is formed after the recess 242 is formed. Distortion can be prevented.

Other steps of the method of manufacturing the rotor 200 of the second embodiment are the same as those of the method of manufacturing the rotor 100 of the first embodiment.

[Modification]
It should be noted that the embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications (modifications) within the meaning and scope equivalent to the scope of the claims.

For example, in the above-described first and second embodiments, the example in which the plurality of first electromagnetic steel sheets 40 and 240 are laminated from one end side to the other end side in the lamination direction (Z direction) is shown. The present invention is not limited to this. In the present invention, like a rotor 300 according to a first modified example shown in FIG. 16, a plurality of first electromagnetic steel sheets may be laminated only on one end side in the lamination direction. Moreover, like a rotor 400 according to a second modification shown in FIG. 17, a plurality of first electromagnetic steel sheets may be laminated only on the one end side portion and the other end side portion in the lamination direction.

Further, in the above-described first and second embodiments, an example in which the recess remains after the magnet fixing step (S50) is shown, but the present invention is not limited to this. In the present invention, like the rotor 500 according to the third modified example shown in FIG. 18, the rotor may be in a flat state without leaving any dents after the magnet fixing step.

In addition, in the first and second embodiments, the second electromagnetic steel plate 50 including the magnet insertion hole 51 and the recess through-hole 52 penetrating at positions corresponding to the recesses 42 and 242 in the stacking direction (Z direction). is laminated, but the present invention is not limited to this. In the present invention, like the rotor 600 according to the fourth modified example shown in FIG. 19, the second rotor 600 includes magnet insertion holes and does not include through holes for recesses penetrating at positions corresponding to the recesses in the stacking direction (Z direction). Magnetic steel sheets may be laminated. In this case, since there is no recess through-hole for arranging the recess in a recessed state, it is preferable that the recess should not remain recessed, as in the case of the rotor 500 according to the third modification.

Further, in the first and second embodiments described above, in each of the plurality of first electromagnetic steel plates 40 and 240, the recess 42 is provided so as to be adjacent to the magnet insertion hole 41 radially inward (R1 side). Although an example is shown, the present invention is not limited to this. In the present invention, in each of the plurality of first electromagnetic steel sheets, the recess may be provided so as to be adjacent to the magnet insertion hole in the radial direction outside, or may be adjacent to the magnet insertion hole in the circumferential direction. It may be provided as follows.

Further, in the above-described first and second embodiments, an example in which one concave portion 42, 242 is provided for each magnet insertion hole 41 was shown, but the present invention is not limited to this. In the present invention, the number of recesses provided in the magnet insertion hole is not limited.

10a end portion (in the stacking direction) 13 lamination magnet insertion hole 30 permanent magnet 40 first electromagnetic steel plate 41 magnet insertion hole 42, 242 recess 42a, 242a (of recesses) Permanent magnet side) portion 42b Projection portion 42c Base (both sides of projection portion) 42d Portion (between notches) 43 Notch portion 50 Second electromagnetic steel plate 51 ... Magnet insertion hole 52 ... Through hole for concave portion 100, 200, 300, 400, 500, 600 ... Rotor G ... Gap

Claims (5)

a first electromagnetic steel sheet forming step of forming a plurality of first electromagnetic steel sheets including a magnet insertion hole and a recess adjacent to the magnet insertion hole and recessed along the stacking direction;
After the first electromagnetic steel sheet forming step, an electromagnetic steel sheet laminating step of laminating the plurality of first electromagnetic steel plates so that the plurality of magnet insertion holes and the plurality of recesses are stacked in the lamination direction;
After the electromagnetic steel sheet lamination step, a magnet arrangement step of arranging permanent magnets in laminated magnet insertion holes formed by stacking a plurality of the magnet insertion holes;
After the magnet arranging step, the recess is pressed in a direction opposite to the direction in which the recess is recessed, and the portion of the recess on the permanent magnet side presses the permanent magnet. and a magnet fixing step of fixing the permanent magnets to the magnet insertion holes by plastically deforming the permanent magnet side portion so as to move the permanent magnet side portion toward the permanent magnet side. The magnet arranging step is a step of arranging the permanent magnet in the laminated magnet insertion hole such that a gap is formed between the laminated magnet insertion hole and the permanent magnet,
In the magnet fixing step, the permanent magnet is fixed to the magnet insertion hole by plastically deforming a portion of the recess on the permanent magnet side so as to move the permanent magnet side so as to fill the gap. 2. The method of manufacturing a rotor according to claim 1, which is a process. In addition to the magnet insertion hole and the recess, the first electromagnetic steel sheet forming step includes the plurality of notches extending from the magnet insertion hole toward the side opposite to the magnet insertion hole on both sides of the recess. 3. The method of manufacturing a rotor according to claim 1, wherein the step of forming the first electromagnetic steel sheet. The first electromagnetic steel sheet forming step includes
a magnet insertion hole forming step of forming the magnet insertion hole so as to include a protruding portion protruding toward the inside of the magnet insertion hole;
After the magnet insertion hole forming step, a notch forming step of forming the notch so as to extend from the roots on both sides of the protrusion toward the side opposite to the magnet insertion hole;
4. The rotor according to claim 3, further comprising, after the notch forming step, a recess forming step of forming the recess by deforming a portion sandwiched between the notches so as to be recessed in the stacking direction. manufacturing method. a second electromagnetic steel sheet forming step of forming a second electromagnetic steel sheet including the magnet insertion hole and a recess through-hole penetrating at a position corresponding to the recess in the stacking direction;
In the electromagnetic steel sheet laminating step, the recesses of the plurality of first electromagnetic steel sheets are inserted into the through holes for recesses of the second electromagnetic steel sheets, and the second electromagnetic steel sheets are positioned at the edges in the stacking direction. A step of laminating the plurality of first electromagnetic steel sheets and the second electromagnetic steel sheets so as to be positioned in the part,
In the magnet fixing step, the permanent magnet is fixed to the magnet insertion hole by plastically deforming such that the permanent magnet side portion of the recess inserted into the recess through hole is moved toward the permanent magnet. The rotor manufacturing method according to any one of claims 1 to 4, wherein the step of fixing to the rotor.

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