JP7188588B2 - Rotor and rotor manufacturing method - Google Patents

Description

The present invention relates to a rotor and a method of manufacturing the rotor.

Among the rotor cores of rotary electric machines (motors), there is a rotor core in which a plurality of arc-shaped split cores are arranged in a ring to form an annular core plate, and the configured core plates are stacked. Are known. When the core plates are stacked, the arc-shaped split cores are arranged such that the phases in the circumferential direction are shifted. A rotor core is formed in this state.

In the rotor core composed of split cores, the individual split cores are fixed by permanent magnets inserted into the magnet insertion holes. Furthermore, JP2013-169131A discloses a technique of fixing a core plate by engaging a projection provided on an end plate with a groove provided on the outer peripheral edge of the core plate.

However, when using the technique of JP2013-169131A, depending on variations in the positions of the grooves, the positions of the magnet insertion holes engaged with the permanent magnets and the projections of the end plates in the core plate There is a possibility that the split core may not be sufficiently fixed because the position of the split core may be relatively misaligned with the groove.

A rotor of the present invention includes a rotor shaft and is used in a rotary electric machine that is rotationally driven by the magnetic force of permanent magnets inserted into magnet insertion holes. It has a rotor core configured by stacking core plates arranged side by side in the axial direction, and end plates provided at respective ends in the axial direction of the rotor core. The end plate has a protrusion that protrudes toward the magnet insertion hole and locks the inner wall surface on the inner diameter side of the magnet insertion hole.

FIG. 1 is an exploded perspective view of the rotor core of the first embodiment. FIG. 2 is an axial sectional view of the motor. FIG. 3 is an enlarged view of area A in FIG. FIG. 4 is a perspective view of a portion of the endplate prior to configuration of the protrusions; FIG. 5 is a plan view of split cores and end plates. FIG. 6 is a flowchart showing a rotor manufacturing method. FIG. 7 is a plan view of an example of split cores and end plates in the first modified example. FIG. 8 is a plan view of another example of split cores and end plates in the first modification. FIG. 9 is a plan view of another example of split cores and end plates in the second embodiment. FIG. 10 is a plan view of another example of split cores and end plates in the second modification. FIG. 11 is a plan view of another example of split cores and end plates in the second modification. FIG. 12 is a plan view of still another example of split cores and end plates in the second modification. FIG. 13 is a cross-sectional view of the end plate when protrusions are generated in the third embodiment. FIG. 14 is a cross-sectional view of the endplate when protrusions are produced. FIG. 15 is a cross-sectional view of the endplate when protrusions are produced. FIG. 16 is a perspective view of a portion of the endplate prior to configuration of the protrusions; FIG. 17 is a cross-sectional view of the endplate when protrusions are produced. FIG. 18 is a cross-sectional view of an end plate having projections of separate members. FIG. 19 is a flow chart showing a rotor manufacturing method in the fourth embodiment.

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

(First embodiment)
FIG. 1 is an exploded perspective view of a rotor core 100 that constitutes a rotor of a rotary electric machine (motor) according to the first embodiment. In this figure, in addition to rotor core 100, end plate 30 is shown.

The split core 10 constitutes a part of an annular core plate 20 , more specifically, a part forming 1/4 (90 degrees) of the core plate 20 . One core plate 20 is configured by arranging four split cores 10 side by side in the circumferential direction. By stacking a plurality of core plates 20 and providing end plates 30 at the ends of the stacked core plates 20 , a stack of core plates 20 forming the rotor core 100 is configured.

In this figure, only one of the four split cores 10 constituting the core plate 20 is shown for the core plate 20 of the upper first layer in the figure, and the other three split cores 10 are shown. Core 10 has been omitted for readability. In addition, only one of the end plates 30 positioned below is shown, and the other end plate 30 positioned above is omitted.

When the core plates 20 are stacked, the boundaries of the split cores 10 constituting the core plates 20 are rotated in the same direction by a predetermined angle (“90/4” degrees in this embodiment) (this In embodiments, it is arranged to rotate counterclockwise upwards). This is because the rotor core 100 is used, for example, in a 16-pole motor. The split core 10 constitutes four poles arranged in a ring, and the phase of the core plate 20 is shifted by one pole in the circumferential direction. Therefore, the core plates 20 are stacked with a phase shift of 90/4 (=360/16) degrees.

As shown, in the upper part of the rotor core 100, the clockwise end of the split core 10 of the second layer is positioned relative to the end 11 of the split core 10 of the first layer in the clockwise direction (right in the drawing). The portion 11 is shifted clockwise by a predetermined angle (90/4 degrees). By stacking the core plates 20 out of phase, it is possible to prevent the ends 11 from aligning in the vertical direction.

A plurality of recesses 13 extending in the axial direction are provided in the inner peripheral surface of the split core 10 in the circumferential direction. A plurality of (four in this embodiment) magnet insertion holes 14 are vertically formed through the split core 10 in the vicinity of the outer periphery thereof. Since the permanent magnets 40 are inserted into the magnet insertion holes 14, the number of the magnet insertion holes 14 corresponds to the number of poles of the motor. Furthermore, the split core 10 is provided with a lightening hole 15 on the inner diameter side of the magnet insertion hole 14 . The light weight hole 15 can reduce the weight of the rotor core 100 .

By stacking the core plates 20 composed of the divided cores 10 arranged in parallel in the circumferential direction, a stack of the core plates 20 forming the rotor core 100 is configured. The stack of core plates 20 has welded portions 16 welded in the axial direction (stacking direction) on the inner periphery thereof. Although one welded portion 16 is provided in this figure, a plurality of (for example, four) welded portions 16 may be provided.

A protruding portion 31 protruding toward the rotor core 100 is provided on the upper surface of the disk-shaped end plate 30 shown below the rotor core 100 which is a laminate of the core plates 20 . When the rotor is configured, the protruding portion 31 is arranged to protrude toward the inside of the magnet insertion hole 14 of the split core 10 .

FIG. 2 is an axial cross-sectional view through a rotation axis O of a motor 300 assembled using rotor core 100. FIG. 3 is an enlarged view of area A in FIG.

As shown in FIG. 2, rotor 200 is configured by externally inserting rotor core 100 onto rotor shaft 101 and fixing it. Motor 300 is configured by rotatably inserting rotor 200 into stator 103 fixed to housing 102 .

The rotor shaft 101 is composed of a core support portion 104 that supports the rotor core 100 , a shaft 105 that serves as the rotating shaft of the rotating rotor 200 , a core support portion 104 , and a connecting portion 106 that connects the core support portion 104 and the shaft 105 . Configured. With such a configuration, the rotor 200 rotates around the shaft 105 serving as the rotation axis O inside the stator 103 .

The core support portion 104 of the rotor shaft 101 is provided with a stopper 107 protruding radially outward from one axial end (left side in the drawing) of the outer periphery. The rotor core 100, which is a laminate of core plates 20, has the permanent magnets 40 inserted into the magnet insertion holes 14, and is externally fitted onto the core support portions 104 of the rotor shaft 101 while being fixed by the end plates 30 at both ends. The end plate 30 and the rotor core 100 are fixed by a retainer 108 at the other end in the axial direction. The rotor 200 is thus constructed.

Here, the configuration of the end plate 30 on the side where the retainer 108 is provided will be described with reference to FIG.

The end plate 30 includes a protruding portion 31 that protrudes into the magnet insertion hole 14 toward the core plate 20 side. The protrusion 31 connects between the flat portion 311 parallel to the radial plane of the end plate 30 and the main body of the core plate 20 , and is parallel to the radial plane of the end plate 30 . and an inclined portion 312 that inclines. Protruding portion 31 contacts core plate 20 located on the outermost side of rotor core 100 at inclined portion 312 .

FIG. 4 is a perspective view of a portion of end plate 30 before projections 31 are configured. A U-shaped notch 32 is provided in the end plate 30, and the notch 32 includes a circumferential notch 321 having a length L in the circumferential direction and a radial notch 322 having a length W in the radial direction. As shown in the drawing, the protruding portion 31 is formed by pressing the position indicated by the arrow in the drawing inside the notch 32 .

Referring to FIG. 3 again, in the radial direction, the position P1 of the peripheral cut 321 of the end plate 30 is located on the inner diameter side of the position P2 of the inner wall surface of the magnet insertion hole 14 on the outer diameter side. In the radial direction, the projecting portion 31 is configured such that the total radial length L of the flat portion 311 and the inclined portion 312 is shorter than the radial width M of the magnet insertion hole 14 . . By configuring in this way, even if there is a dimensional variation in the protrusion 31 , the protrusion 31 can be configured to protrude into the magnet insertion hole 14 .

In addition, the position P3 of the inner diameter side end of the inclined portion 312 and the position P3 of the inclination start portion from the radial direction surface of the end plate 30 is closer to the inner diameter side than the position P4 of the inner wall surface of the magnet insertion hole 14 on the inner diameter side. Become. In this way, when the end plate 30 is adjacent to the core plate 20, the inclined portion 312 of the protruding portion 31 can be brought into contact with the core plate 20 at an arbitrary position. can be done more reliably. Furthermore, since the inclined portion 312 is configured to abut against the inner wall surface of the magnet insertion hole 14 on the inner diameter side, it is possible to prevent the split core 10 from shifting toward the outer diameter side when the rotor 200 rotates. .

Note that the difference between the position P1 of the peripheral cut 321 and the position P2 of the inner wall surface on the outer diameter side of the magnet insertion hole 14, the position P3 of the inclination start portion of the end plate 30, and the inner diameter side of the magnet insertion hole 14 Comparing the difference with the position P4 of the wall surface, the difference between the positions P1 and P2 is much larger than the difference between the positions P3 and P4. Therefore, in order to clarify the difference between the length L of the projecting portion 31 and the width M of the magnet insertion hole 14, the starting position of the lower end of the length L is changed to the position P3, and the starting position of the lower end of the width M is It is described as position P4, which is a point.

Also, the end plate 30 on which the projecting portion 31 is formed is made of a metal softer than the split core 10 forming the core plate 20 . Therefore, when the protruding portion 31 contacts the core plate 20 at the inclined portion 312, the inclined portion 312 is plastically deformed so that the end of the inner wall surface of the magnet insertion hole 14 bites in, so that the split core 10 is fixed more reliably. be able to. If the projecting portion 31 is a member different from the end plate 30, only the projecting portion 31 may be made of a soft metal.

In this figure, the flat portion 311 of the protruding portion 31 is configured to be adjacent to the main body portion of the end plate 30 via the circumferential cut 321 on the outer diameter side thereof, but this is not restrictive. The flat portion 311 of the protruding portion 31 and the body portion of the end plate 30 may be separated from each other. Further, the formation of the projecting portion 31 may be performed before or after the end plate 30 is fitted over the rotor shaft 101 .

In the present embodiment, as shown in FIG. 2, the end plate 30 on the side where the retainer 108 is provided is provided with a projecting portion 31, and the end plate 30 on the side where the stopper 107 is provided is provided with a protrusion 31. , the projection 31 is not provided.

The reason for this is that the magnet insertion hole 14 is slightly longer than the permanent magnet 40 in the axial direction, and generally the difference is approximately the thickness of one core plate 20 and not the thickness of two core plates 20 . will not be too long. Therefore, the split core 10 positioned at the end in the axial direction that is not fixed by the permanent magnet 40 can be fixed only by providing the projecting portion 31 on one of the end plates 30 .

Another reason is that in the manufacturing process of the rotor 200, the permanent magnets 40 are inserted into the magnet insertion holes 14 coated with adhesive from the retainer 108 side. Due to such a manufacturing direction, there is a high possibility that the split core 10 will be peeled off on the retainer 108 side for reasons described later.

FIG. 5 is a plan view of the split core 10 at the end on the retainer 108 side. This figure shows the split core 10 and the projecting portion 31 of the end plate 30 adjacent to the split core 10 . As can be understood from this figure, the end plate 30 is provided with protrusions 31 corresponding to all of the magnet insertion holes 14 .

FIG. 6 is a flow chart showing a method of manufacturing the rotor 200. As shown in FIG.

In step S1, the end plate 30 is provided with a notch 32 shown in FIG.

In step S2, the inside of the notch 32 (the position indicated by the arrow in FIG. 4) is pressed on the end plate 30 to generate the projecting portion 31. As shown in FIG.

In step S3, the core plate 20 is formed by arranging the four split cores 10 side by side in the circumferential direction, and the core plates 20 are stacked while shifting the phase of each layer. By welding the concave portion 13 in the , the welded portion 16 is formed to constitute the rotor core 100 (laminated body of the core plates 20).

In step S4, one end plate 30 and the rotor core 100 are externally fitted onto the rotor shaft 101 from the side opposite to the side where the stopper 107 is provided (the side where the retainer 108 is provided).

In step S<b>5 , an adhesive is applied to the inner wall surface of the magnet insertion hole 14 in the rotor core 100 .

In step S6, the permanent magnet 40 is inserted into the magnet insertion hole 14 from the side where the retainer 108 is provided.

In step S7, the other end plate 30 is externally inserted so that the projecting portion 31 is inserted into the magnet insertion hole 14 from the retainer 108 side of the rotor shaft 101 .

In step S8, the retainer 108 is press-fitted into the rotor shaft 101 from the side where the retainer 108 is provided. By doing so, in the rotor shaft 101, the rotor core 100, which is a laminate of the core plates 20 having the permanent magnets 40 provided in the magnet insertion holes 14, is provided with the end plates 30 at both ends, and the retainer 108 , and the rotor 200 is manufactured.

After applying adhesive to the inner wall surface of magnet insertion hole 14 (S5), permanent magnet 40 is inserted into magnet insertion hole 14 in rotor core 100 from the side where retainer 108 is provided. Therefore, in the magnet insertion hole 14, the adhesive applied to the inner surface moves to the side where the stopper 107 is provided as the permanent magnet 40 is inserted. is smaller than the side on which the stopper 107 is provided. As a result, split cores 10 are more likely to separate on the side where retainer 108 is provided than on the side where stopper 107 is provided in the stack of core plates 20 fastened by welded portion 16 . Therefore, by providing the end plate 30 on the retainer 108 side where the separation of the split core 10 is high, the protruding portion 31 that locks the inner wall of the magnet insertion hole 14 is provided, thereby suppressing the separation of the split core 10 .

According to the first embodiment, the following effects can be obtained.

According to the rotor 200 of the first embodiment, the end plate 30 is provided with the protrusion 31 that protrudes toward the magnet insertion hole 14 and locks the inner wall surface of the magnet insertion hole 14 on the inner diameter side. Here, a rotor core 100 , which is a laminate of core plates 20 formed by laminating split cores 10 while shifting their phases, is fixed by permanent magnets 40 inserted into magnet insertion holes 14 .

However, if the permanent magnet 40 is displaced toward one end in the axial direction in the magnet insertion hole 14, the core plate 20 positioned at the other end is not fixed by the permanent magnet 40, and the split core 10 may separate. There is Therefore, by providing the end plate 30 with the protruding portion 31 that engages the inner wall surface on the inner diameter side of the magnet insertion hole 14, the strength against the radially outward centrifugal force generated when the rotor 200 rotates is improved. Therefore, separation of the split cores 10 can be suppressed.

Furthermore, in order to ensure the strength of the split cores 10 at the ends, when the core plates 20 are provided with the welded portions 16 , the welded portions 16 are added at the axial ends of the stack of the core plates 20 in addition to the welded portions 16 . A weld had to be provided. However, when configured as in the present embodiment, there is no need to provide such an additional welded portion, and the tact time can be reduced, the welding inspection time, etc. can be shortened, so the manufacturing cost can be reduced. be able to.

In addition, since the position of the magnet insertion hole 14 affects the drive torque of the motor, the magnet insertion hole 14 is provided with higher accuracy than the lightweight hole 15 . By providing the projecting portion 31 that engages the inner wall surface of the magnet insertion hole 14 with relatively high positional accuracy, the split core 10 can be securely fixed. Furthermore, compared with the lightening hole 15, the magnet insertion hole 14 is often rectangular, and the inner wall surface on the inner diameter side is flat. Therefore, the projecting portion 31 may be configured linearly so as to engage with the flat inner wall surface. Furthermore, since it is not necessary to newly provide a groove for engaging with the projecting portion 31, the manufacturing cost can be reduced.

According to the rotor 200 of the first embodiment, the protruding portion 31 is shorter than the magnet insertion hole 14 in the radial direction, and the position (P1 in FIG. 3) of the end portion on the outer diameter side of the protruding portion 31 It is positioned on the inner diameter side of the position (P2) of the inner wall surface on the outer diameter side of the insertion hole 14 .

With this configuration, the radially outer end portion of the projecting portion 31 and the radially outer wall surface of the magnet insertion hole 14 are separated from each other in the radial direction. As a result, even if there is a dimensional variation between the projecting portion 31 and the magnet insertion hole 14, interference between the projecting portion 31 and the inner wall surface of the magnet insertion hole 14 is suppressed on the outer diameter side. It can be appropriately positioned within the insertion hole 14 .

According to the rotor 200 of the first embodiment, the protruding portion 31 is inclined with respect to the radial surface of the end plate 30 and includes the inclined portion 312 that engages the inner wall surface of the magnet insertion hole 14 on the inner diameter side. , the inclined portion 312 may engage the inner wall surface on the inner diameter side of the magnet insertion hole 14 at an arbitrary position. As a result, even if there is a dimensional variation between the projecting portion 31 and the magnet insertion hole 14, the inclined portion 312 of the projecting portion 31 can be brought into contact with the inner wall surface of the magnet insertion hole 14 on the inner diameter side. can be fixed.

According to the rotor 200 of the first embodiment, the inclination start portion (P4 in FIG. 3) of the inclined portion 312 with respect to the radial surface of the end plate 30 is located further than the inner wall surface (P3) of the magnet insertion hole 14 on the inner diameter side. Inside diameter side. With this configuration, when the end plate 30 is adjacent to the core plate 20 , the inclined portion 312 of the protruding portion 31 is in contact with the core plate 20 . is suppressed from separating from the inner wall surface on the inner diameter side of the core plate 20, and the fixing of the core plate 20 can be performed more reliably.

According to the rotor 200 of the first embodiment, the end plate 30 including the projecting portion 31 is provided on the end plate 30 adjacent to one end of the rotor core 100 formed by stacking the core plates 20 . In the axial direction, the difference in length between the magnet insertion hole 14 and the permanent magnets 40 is small, generally no longer than two thicknesses of the core plate 20 . Therefore, since there is at most one core plate 20 in which the permanent magnet 40 does not exist in the magnet insertion hole 14 , by providing the projecting portion 31 only on one end plate 30 , the split core 10 that is not fixed by the permanent magnet 40 can be removed. can be fixed.

According to the rotor 200 of the first embodiment, when manufacturing the rotor 200, an adhesive is applied to the wall surface of the magnet insertion hole 14 (S5) before inserting the permanent magnets 40 (S6). The projecting portion 31 is provided on the end plate 30 on the retainer 108 side into which the permanent magnet 40 is inserted into the magnet insertion hole 14 .

Therefore, in the magnet insertion hole 14, the adhesive applied to the inner wall surface moves to the side where the stopper 107 is provided as the permanent magnet 40 is inserted. is smaller than the side on which the stopper 107 is provided. As a result, part of the split cores 10 in the stack of core plates 20 fastened by the welded portions 16 is more likely to separate on the side where the retainer 108 is provided than on the side where the stopper 107 is provided. Therefore, by providing the end plate 30 on the side of the retainer 108 where separation of the split core 10 is likely to occur, the projecting portion 31 that engages the inner wall surface of the magnet insertion hole 14 is provided, thereby making it easier to suppress separation of the split core 10 . . Furthermore, since the projecting portion 31 is provided only on one end plate 30, the processing cost can be reduced.

According to the rotor 200 of the first embodiment, the end plate 30 forming the protruding portion 31 is made of a soft material with lower hardness than the core plate 20 (split core 10). Therefore, when the projecting portion 31 contacts the core plate 20 at the inclined portion 312, the inclined portion 312 is plastically deformed so that the edge of the core plate 20 bites into the inclined portion 312, so that the split core 10 can be fixed more reliably.

(First modification)
In the first embodiment, the protruding portion 31 is provided so as to contact most of the inner wall surface of the magnet insertion hole 14 of the split core 10, but the present invention is not limited to this. As shown in FIG. 7 , the projecting portion 31 may be provided so as to come into contact with part of the inner wall surface of the magnet insertion hole 14 . Also, as shown in FIG. 8 , two or more projections 31 may be provided corresponding to one magnet insertion hole 14 .

(Second embodiment)
In the first embodiment, the protruding portions 31 of the end plate 30 are provided so as to correspond to all the magnet insertion holes 14 provided in the split core 10, but the present invention is not limited to this. In the present embodiment, an example in which the projecting portion 31 of the end plate 30 is provided so as to correspond to a part of the magnet insertion hole 14 provided in the split core 10 will be described.

FIG. 9 is a view corresponding to FIG. 5 of the first embodiment, and is a plan view showing the split core 10 and the projecting portion 31 of the end plate 30. As shown in FIG. As shown in this figure, the projections 31 of the end plate 30 are located at two positions corresponding to the magnet insertion holes 14 existing near the end 11 among the four magnet insertion holes 14 provided in the split core 10 . is provided in Even with this configuration, the split core 10 can be fixed by the projecting portion 31 .

According to the second embodiment, the following effects can be obtained.

According to the rotor 200 of the second embodiment, in the split core 10, when the rotor 200 rotates, a greater stress acts on the ends in the circumferential direction than on the center. Therefore, by providing the projecting portion 31 on the end plate 30 so as to lock the split core 10 in the magnet insertion hole 14 at the circumferential end of the plurality of magnet insertion holes 14 , separation of the split core 10 is suppressed. In addition to this, the manufacturing cost can be reduced by reducing the number of protrusions 31 .

(Second modification)
In the second embodiment, the protrusions 31 are provided at two positions corresponding to the magnet insertion holes 14 existing at the circumferential ends of the four magnet insertion holes 14 of the split core 10 . Not exclusively. The projecting portion 31 may be provided at a position corresponding to an arbitrary magnet insertion hole 14 in the split core 10 .

For example, as shown in FIG. 10, protrusions 31 may be provided at positions corresponding to three of the four magnet insertion holes 14 of the split core 10 excluding one end. . As shown in FIG. 11 , protrusions 31 may be provided at positions corresponding to two adjacent magnet insertion holes 14 including the ends among the four magnet insertion holes 14 of the split core 10 . As shown in FIG. 12, a projecting portion 31 may be provided at a position corresponding to one magnet insertion hole 14 at the end.

(Third embodiment)
In the first embodiment, as shown in FIGS. 3 and 4, the U-shaped notch 32 is provided in the end plate 30, and the protrusion 31 is formed by pressing the inside thereof, but the present invention is not limited to this.

FIG. 13 is a cross-sectional view of the end plate 30 when the protruding portion 31 is produced in the third embodiment. As shown in this figure, it is assumed that the notch 32 is not provided. By pressing a position corresponding to the magnet insertion hole 14 of the end plate 30 from the side opposite to the side where the core plate 20 is provided, a part of the end plate 30 is broken and the projecting portion 31 is removed by plastic deformation. may be provided. In such a case, since step S1 can be omitted, the manufacturing process can be reduced.

As another example, as shown in FIG. 14, the notch 32 is not provided, and the position corresponding to the magnet insertion hole 14 of the end plate 30 is positioned on the side opposite to the side on which the core plate 20 is provided. By pressing the radial surface of the plate 30 , the projecting portion 31 may be provided by plastic deformation without breaking a part of the end plate 30 .

As shown in FIG. 15, a portion of the end plate 30 is pressed obliquely from the side where the core plate 20 is provided to the position corresponding to the magnet insertion hole 14 of the end plate 30 without providing the cut 32 . The projecting portion 31 may be provided by plastic deformation without breaking the .

As shown in FIGS. 16 and 17, instead of the notch 32 shown in FIG. 4, a notch 33 consisting of a circumferential notch 331 and a radial notch 332 is provided, and the inside of the notch 33 is pressed. Accordingly, the projecting portion 31 may be provided.

According to the third embodiment, the following effects can be obtained.

According to the rotor 200 of the third embodiment, the projecting portion 31 is configured by applying a load to the end plate 30 to plastically deform it. By configuring in this way, the projecting portion 31 can be configured easily. Further, when the end plate 30 is not provided with the notch 32 or the notch 33, the step of providing the notch 32 (S1) can be omitted, thereby further reducing the manufacturing cost.

(Third modification)
In the third embodiment, the projecting portion 31 is provided by applying a load to the end plate 30 to plastically deform it, but the present invention is not limited to this. For example, the projecting portion 31 may be configured as a separate member from the end plate 30 .

FIG. 18 is a cross-sectional view of an end plate 30 having projections 31 that are separate members. The end plate 30 is provided with an opening 34 into which the projecting portion 31 is press-fitted. Thus, the protrusion 31 is configured on the end plate 30 . By configuring in this way, the design accuracy can be improved as compared with the case where the projecting portion 31 is manufactured by applying a load.

(Fourth embodiment)
In the first embodiment, as shown in FIG. 6, the protrusion 31 is generated by pressing the end plate 30 (S2) to the rotor shaft 101 of the end plate 30 on the retainer 108 side where the protrusion 31 is provided. (S7), but it is not limited to this. In the fourth embodiment, the generation of the projecting portion 31 by pressing the end plate 30 (S2) is performed after the end plate 30 on the side of the retainer 108 where the projecting portion 31 is provided is attached to the rotor shaft 101 (S7). .

FIG. 19 is a flow chart showing a method of manufacturing the rotor 200 according to this embodiment. As shown in this figure, the protrusion 31 is formed by pressing the end plate 30 (S2) after the end plate 30 on the retainer 108 side where the protrusion 31 is provided is attached to the rotor shaft 101 (S7). It is done.

According to the rotor 200 of the fourth embodiment as described above, it is possible to omit the pre-machining operation of the end plate 30, so that the parts cost can be reduced and the flexibility of the manufacturing method can be improved.

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments. do not have. Moreover, the above-described embodiments can be combined as appropriate.

Claims (11)

A rotor for use in a rotary electric machine that includes a rotor shaft and is rotationally driven by the magnetic force of permanent magnets inserted into magnet insertion holes,
a rotor core configured by axially stacking core plates each configured by arranging arc-shaped split cores having the magnet insertion holes in parallel in the circumferential direction;
and an end plate provided at each axial end of the rotor core,
The rotor, wherein the end plate has a projecting portion that projects toward the magnet insertion hole and locks an inner wall surface on the inner diameter side of the magnet insertion hole. A rotor according to claim 1, wherein
In the rotor, the protruding portion is radially shorter than the magnet insertion hole, and an outer diameter side end portion of the protruding portion is located on an inner diameter side of an inner wall surface of the outer diameter side of the magnet insertion hole. 3. The rotor according to claim 1 or 2,
the projecting portion includes an inclined portion that is inclined with respect to a radial surface of the end plate;
The rotor, wherein the inclined portion engages an inner wall surface on the inner diameter side of the magnet insertion hole. A rotor according to claim 3, wherein
The rotor of the rotor, wherein the inclined portion is configured such that an inclined portion from a radial surface of the end plate is located on the inner diameter side of an inner wall surface of the magnet insertion hole on the inner diameter side. A rotor according to any one of claims 1 to 4,
The rotor, wherein the protrusion is provided on one of the end plates. A rotor according to any one of claims 1 to 5,
the protrusion is part of the end plate;
The rotor, wherein the end plates are made of a material having a hardness lower than that of the split cores. A rotor according to any one of claims 1 to 6,
The rotor, wherein the protrusions are provided so as to protrude toward the magnet insertion holes at both ends in the circumferential direction among the plurality of magnet insertion holes provided in the split core. generating a rotor core configured by axially laminating core plates, each of which is configured by arranging arc-shaped split cores having magnet insertion holes in parallel in a circumferential direction;
externally inserting the first end plate and the rotor core from the side opposite to the side on which the stopper is provided with respect to the rotor shaft provided with the stopper;
inserting a permanent magnet into the magnet insertion hole of the rotor core;
externally inserting a second end plate from the side opposite to the side on which the stopper is provided with respect to the rotor shaft;
Further, in the rotor manufacturing method, the second end plate has a protrusion that protrudes toward the magnet insertion hole and engages an inner wall surface on the inner diameter side of the magnet insertion hole. A method for manufacturing the rotor according to claim 8,
The rotor manufacturing method, wherein the protruding portion is generated by applying a load to the second end plate. A method for manufacturing a rotor according to claim 8 or 9,
A method of manufacturing a rotor, wherein the production of the protrusion is performed after extrapolation of the second end plate. A method for manufacturing a rotor according to any one of claims 8 to 10,
A method of manufacturing a rotor, wherein an adhesive is applied to an inner wall of the magnet insertion hole prior to the insertion of the permanent magnet.

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