Rotor

Abstract

To provide a rotor capable of uniformly filling resin throughout the entire gap where no permanent magnet is placed within each of multiple magnet-holding holes of all multiple rotor core block sections, while suppressing the formation of areas difficult for resin to reach, when the multiple rotor core block sections are stacked axially.SOLUTION: In a rotor 100, permanent magnets 20, in a first rotor core block section 11 and a second rotor core block section 12, which are offset from each other by a predetermined angle in a C direction are arranged to be spaced apart from each other in a Z direction. The rotor 100 includes a resin-filled inter-magnet section 33, which is resin filled between the permanent magnets 20 arranged to be spaced apart from each other in the Z direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a rotor. [Background technology]

[0002] BACKGROUND ART Conventionally, a rotor is known that includes a rotor core in which a plurality of rotor core block portions are stacked in the axial direction (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a rotor including a rotor core in which multiple rotor core block portions having multiple magnet accommodating holes are stacked in the axial direction, multiple permanent magnets disposed inside each of the multiple magnet accommodating holes to form magnetic poles, and one-side and other-side filled resin portions, which are resin filled on one longitudinal side and the other longitudinal side of the permanent magnet, respectively, inside each of the multiple magnet accommodating holes of each of the multiple rotor core block portions. In the rotor described in Patent Document 1, the multiple rotor core block portions include a first rotor core block portion and a second rotor core block portion, the magnetic poles of which are offset from each other by a predetermined angle in the circumferential direction and which are arranged adjacent to each other in the axial direction. In the rotor described in Patent Document 1, the permanent magnets of the first rotor core block portion and the second rotor core block portion, which are offset from each other in the circumferential direction by a predetermined angle, are arranged so as to at least partially overlap each other when viewed axially and so as to contact each other in the axial direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-163761 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional rotor described in Patent Document 1, the permanent magnets of the first rotor core block portion and the second rotor core block portion, which are offset from each other in the circumferential direction by a predetermined angle, are arranged so that they at least partially overlap when viewed from the axial direction and so that they contact each other in the axial direction. Therefore, there are cases where at least one of the one-side filling resin portions of the first rotor core block portion and the second rotor core block portion, which are offset from each other in the circumferential direction by a predetermined angle, is not connected to each other. In this case, when multiple rotor core block portions are stacked in the axial direction, and resin is simultaneously filled throughout the gaps in each of the multiple magnet accommodating holes of all of the multiple rotor core block portions, including the first rotor core block portion and the second rotor core block portion, where no permanent magnets are arranged, there are likely to be areas that are difficult for the resin to reach. For this reason, there is a demand for a rotor that can fill resin in all of the gaps in each of the multiple magnet accommodating holes of all of the multiple rotor core block sections in one go, where no permanent magnets are located, while preventing the creation of areas where the resin is difficult to reach when the multiple rotor core block sections are stacked in the axial direction.

[0006] This invention has been made to solve the above-mentioned problems, and one object of the invention is to provide a rotor that can fill resin in all of the gaps in each of the multiple magnet accommodating holes of the multiple rotor core block parts in one go, where no permanent magnets are placed, while preventing the creation of areas that are difficult for the resin to reach when the multiple rotor core block parts are stacked in the axial direction. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, a rotor in one aspect of the present invention comprises a rotor core in which a plurality of rotor core block portions each having a plurality of magnet accommodating holes are stacked in the axial direction, a plurality of permanent magnets arranged inside each of the plurality of magnet accommodating holes to form magnetic poles, and a one-side filled resin portion and an other-side filled resin portion which are resin filled on one longitudinal side and the other longitudinal side of the permanent magnet inside each of the plurality of magnet accommodating holes of each of the plurality of rotor core block portions, wherein the magnetic poles of the rotor core block portions are offset from each other by a predetermined angle in the circumferential direction and include a first rotor core block portion and a second rotor core block portion which are arranged adjacent to each other in the axial direction, and wherein the permanent magnets of the first rotor core block portion and the second rotor core block portion which are offset from each other in the circumferential direction by a predetermined angle are arranged so that they at least partially overlap when viewed from the axial direction and are arranged so as to be spaced apart from each other in the axial direction, and further comprises an inter-magnet resin filling portion which is resin filled between the permanent magnets which are arranged so as to be spaced apart from each other in the axial direction.

[0008] In one aspect of the present invention, as described above, the rotor is configured such that the permanent magnets of the first rotor core block portion and the second rotor core block portion, which are offset from each other in the circumferential direction by a predetermined angle, are arranged to be spaced apart from each other in the axial direction, and further includes inter-magnet resin filling portions that are resin filled between the permanent magnets arranged to be spaced apart from each other in the axial direction. This makes it easy to connect at least one of the one-side filling resin portions of the first rotor core block portion and the second rotor core block portion, which are offset from each other in the circumferential direction by the predetermined angle, and the other-side filling resin portions of the first rotor core block portion and the second rotor core block portion, which are offset from each other in the circumferential direction, via the inter-magnet resin filling portions. Furthermore, even if at least one of the one-side filling resin portions of the first rotor core block portion and the second rotor core block portion that are circumferentially offset by a predetermined angle and the other-side filling resin portions of the first rotor core block portion and the second rotor core block portion that are circumferentially offset by a predetermined angle are not connected via the inter-magnet resin filling portion, the one-side filling resin portion of the first rotor core block portion and the other-side filling resin portion of the second rotor core block portion that correspond to the permanent magnets that are circumferentially offset by a predetermined angle are likely to be connected via the inter-magnet resin filling portion, or the other-side filling resin portion of the first rotor core block portion and the one-side filling resin portion of the second rotor core block portion that correspond to the permanent magnets that are circumferentially offset by a predetermined angle are likely to be connected. As a result, when the multiple rotor core block portions are stacked in the axial direction, it is possible to fill resin all at once throughout the entire gaps in each of the multiple magnet accommodating holes of all of the multiple rotor core block portions where no permanent magnets are located, while suppressing the occurrence of areas that are difficult for the resin to reach.

[0009] In the rotor according to the above aspect, preferably, the rotor further comprises a flow path plate arranged axially between the first rotor core block portion and the second rotor core block portion, and including a connecting resin flow path filled with resin so as to connect the one-side filling resin portions and the other-side filling resin portions of the first rotor core block portion and the second rotor core block portion that are circumferentially offset from each other by a predetermined angle.

[0010] With this configuration, the one-side filling resin portions and the other-side filling resin portions of the first rotor core block portion and the second rotor core block portion that are shifted from each other in the circumferential direction by a predetermined angle can be connected to each other via the connecting resin flow paths of the flow path plate. This makes it possible to fill resin all at once throughout the entire gaps where no permanent magnets are arranged inside each of the multiple magnet accommodating holes of all of the multiple rotor core block portions, including the first rotor core block portion and the second rotor core block portion, while reliably preventing the occurrence of areas that are difficult for the resin to reach when the multiple rotor core block portions are stacked in the axial direction.

[0011] In the rotor according to the above aspect, preferably, the axial size of the permanent magnet is equal to the axial size of the rotor core block portion, and the rotor is arranged axially between the first rotor core block portion and the second rotor core block portion, and further includes a flow path plate including a connecting resin flow path filled with resin to connect the one-side filling resin portions of the first rotor core block portion and the second rotor core block portion that are circumferentially offset by a predetermined angle from each other, and the other-side filling resin portions of the first rotor core block portion and the second rotor core block portion that are circumferentially offset by a predetermined angle from each other, and to connect the portion where the one-side filling resin portions are connected to the portion where the other-side filling resin portions that are circumferentially offset from each other by a predetermined angle are connected to form an inter-magnet resin filling portion.

[0012] With this configuration, the connecting resin flow passages in the flow passage plate allow the resin-filled portions between the magnets to be formed even if the axial size of the permanent magnets is not smaller than the axial size of the rotor core block portion, which allows the permanent magnets to be relatively large, thereby improving the magnetic performance of the rotor.

[0013] In the above-described configuration in which the rotor includes a flow path plate, preferably, a plurality of connecting resin flow paths are formed for each magnetic pole so as not to communicate with each other.

[0014] This configuration allows the area of ​​the connecting resin flow path in the flow path plate to be smaller than when only one connecting resin flow path is formed for each magnetic pole, thereby preventing a decrease in the mechanical strength of the flow path plate.

[0015] In the present application, the rotor according to the above aspect may also have the following configuration.

[0016] (Additional note 1) In a configuration in which the one-side connecting resin flow path and the other-side connecting resin flow path corresponding to the same magnet accommodating hole are not connected, preferably, the multiple magnet accommodating holes include one-side magnet accommodating holes and other-side magnet accommodating holes arranged on one and the other circumferential sides, respectively, in each of the magnetic poles of each of the multiple rotor core block portions, and in each of the magnetic poles, the other-side connecting resin flow path corresponding to the one-side magnet accommodating hole and the one-side connecting resin flow path corresponding to the other-side magnet accommodating hole connect the other-side filled resin portion in the one-side magnet accommodating hole of the first rotor core block portion, the other-side filled resin portion in the one-side magnet accommodating hole of the second rotor core block portion, the one-side filled resin portion in the other-side magnet accommodating hole of the first rotor core block portion, and the one-side filled resin portion in the other-side magnet accommodating hole of the second rotor core block portion.

[0017] By configuring in this manner, it is possible to form a second-side connecting resin flow path corresponding to the first-side magnet accommodating hole and a first-side connecting resin flow path corresponding to the second-side magnet accommodating hole, even in cases where the distance between the first-side magnet accommodating hole and the second-side magnet accommodating hole is relatively short in each of the magnetic poles of the multiple rotor core block sections, or where the second-side filling resin portion in the first-side magnet accommodating hole of the first rotor core block section overlaps in the axial direction.

[0018] (Additional note 2) In a configuration in which the rotor is provided with a flow path plate, the first rotor core block portion and the second rotor core block portion are preferably arranged so that at least one of the one-side filling resin portions and the other-side filling resin portions, which are offset from each other by a predetermined angle in the circumferential direction, do not overlap when viewed from the axial direction.

[0019] By configuring it in this manner, the one-side filling resin portions and the other-side filling resin portions of the first rotor core block portion and the second rotor core block portion, which are shifted from each other by a predetermined angle in the circumferential direction, can be effectively connected together via the connecting resin flow path of the flow path plate. [Effects of the Invention]

[0020] According to the present invention, as described above, a rotor can be provided in which, when multiple rotor core block sections are stacked in the axial direction, it is possible to prevent the creation of areas that are difficult for the resin to reach, while simultaneously filling the entire gaps in all of the multiple rotor core block sections and each of the multiple magnet accommodating holes where no permanent magnets are located. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a view of a rotor according to an embodiment of the present invention as seen from the outside in the radial direction. [Figure 2] 1 is a view of a rotor according to an embodiment of the present invention as viewed from the axial direction; [Figure 3]FIG. 3 is a partially enlarged view of FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] 3 is a view of a flow path plate in a rotor according to an embodiment of the present invention, viewed from the axial direction. FIG. [Figure 6] FIG. 4 is a cross-sectional view showing a rotor according to a first modified example of the present invention. [Figure 7] FIG. 10 is a cross-sectional view showing a rotor according to a second modified example of the present invention. [Figure 8] FIG. 10 is a cross-sectional view showing a rotor according to a third modified example of the present invention. [Figure 9] FIG. 10 is a view of a rotor according to a fourth modified example of the present invention, viewed from the outside in the radial direction. [Figure 10] FIG. 10 is a view of a rotor according to a fifth modified example of the present invention, viewed from the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0023] The configuration of a rotor 100 according to one embodiment of the present invention will be described with reference to FIGS.

[0024] (Overall rotor configuration) 1, the rotor 100 includes a rotor core 10 and a plurality of permanent magnets 20. The rotor 100 constitutes a part of an inner rotor type rotating electric machine (not shown). The rotating electric machine is, for example, a motor, a generator, or a motor / generator.

[0025] In the following description, the axial, radial, and circumferential directions of the rotor 100 (rotor core 10) are referred to as the Z direction, R direction, and C direction, respectively. Furthermore, one side and the other side in the axial direction (Z direction) are referred to as the Z1 side and the Z2 side, respectively. Furthermore, the inner and outer sides in the radial direction (R direction) are referred to as the R1 side and the R2 side, respectively. The axial direction of the rotor 100 (rotor core 10) is the direction along the rotational axis A of the rotor 100 (rotor core 10).

[0026] The rotor core 10 is made up of multiple (four) rotor core block portions 10a stacked in the Z direction. Each of the multiple rotor core block portions 10a is formed by stacking multiple electromagnetic steel plates (e.g., silicon steel plates) in the Z direction. The multiple rotor core block portions 10a each have the same shape. When viewed from the Z direction, a through hole 10b is formed in the center of the rotor core 10, through which a rotor shaft (not shown) passes. The through hole 10b passes through the rotor core 10 in the Z direction.

[0027] As shown in Fig. 2, each of the multiple rotor core block portions 10a has multiple magnet accommodating holes 10c. Each of the multiple magnet accommodating holes 10c penetrates the rotor core block portion 10a in the Z direction. As shown in Fig. 3, the multiple magnet accommodating holes 10c include a first-side magnet accommodating hole 10d and an second-side magnet accommodating hole 10e located on the C1 side and the C2 side, respectively, of each magnetic pole MP of each of the multiple rotor core block portions 10a.

[0028] 2, each of the rotor core block portions 10a has a key 10f. A pair of the keys 10f is formed symmetrically with respect to the rotation axis A in each of the rotor core block portions 10a.

[0029] Each of the multiple permanent magnets 20 is disposed inside each of the multiple magnet accommodating holes 10c. The permanent magnets 20 form a magnetic pole MP. Specifically, in each of the multiple rotor core block portions 10a, one magnetic pole MP is formed by the multiple permanent magnets 20 disposed in the two magnet accommodating holes 10c (one-side magnet accommodating hole 10d and the other-side magnet accommodating hole 10e). Each of the multiple permanent magnets 20 has a rectangular shape (oblong shape) when viewed from the Z direction.

[0030] (Configuration of multiple rotor core blocks) 1, the multiple rotor core block portions 10a include a first rotor core block portion 11 and a second rotor core block portion 12. The first rotor core block portion 11 and the second rotor core block portion 12 are arranged adjacent to each other in the Z direction. In the rotor core 10, the first rotor core block portion 11, the second rotor core block portion 12, the second rotor core block portion 12, and the first rotor core block portion 11 are stacked in this order from the Z1 side toward the Z2 side.

[0031] 2, the positions of the magnetic poles MP of the rotor core block portions 10a of the first rotor core block portion 11 and the second rotor core block portion 12 are shifted from each other by a predetermined angle in the direction C. Note that the positions of the keys 10f of the first rotor core block portion 11 and the second rotor core block portion 12 are not shifted from each other in the direction C.

[0032] (Permanent magnet configuration) As shown in Fig. 3, the permanent magnets 20 of the first rotor core block portion 11 and the second rotor core block portion 12, which are offset from each other by a predetermined angle in the C direction, are arranged so as to at least partially overlap when viewed from the Z direction. As shown in Fig. 4, the permanent magnets 20 of the first rotor core block portion 11 and the second rotor core block portion 12, which are offset from each other by a predetermined angle in the C direction, are arranged so as to be spaced apart from each other in the Z direction. Note that the size W1 of the permanent magnet 20 in the Z direction is smaller than the size W2 of the rotor core block portion 10a in the Z direction.

[0033] The permanent magnets 20 of the second rotor core block portions 12 adjacent to each other in the Z direction are arranged so as to entirely overlap when viewed from the Z direction. The permanent magnets 20 of the second rotor core block portions 12 adjacent to each other in the Z direction are arranged so as to contact each other in the Z direction. Specifically, the permanent magnet 20 of the second rotor core block portion 12 on the Z2 side of the two second rotor core block portions 12 is arranged in the magnet accommodating hole 10c so that the Z2-side end of the permanent magnet 20 coincides with the Z2-side end of the magnet accommodating hole 10c. The Z2-side end of the permanent magnet 20 of the second rotor core block portion 12 on the Z1 side of the two second rotor core block portions 12 is arranged in the Z1-side portion of the magnet accommodating hole 10c of the second rotor core block portion 12 on the Z2 side of the two second rotor core block portions 12.

[0034] (Configuration of resin filling part) 3, the rotor core 10 includes a magnet-filled portion 30. The magnet-filled portion 30 includes a one-side filled resin portion 31 and an other-side filled resin portion 32, which are resins filled on one side and the other side of the permanent magnet 20 in the longitudinal direction, inside each of the plurality of magnet accommodating holes 10c of each of the plurality of rotor core block portions 10a.

[0035] The first rotor core block portion 11 and the second rotor core block portion 12 are arranged so that at least one of the one-side filled resin portions 31 and the other-side filled resin portions 32, which are offset from each other by a predetermined angle in the C direction, do not overlap when viewed from the Z direction. Specifically, in each of the magnetic poles MP of the multiple rotor core block portions 10a, the one-side filled resin portions 31 of the one-side magnet accommodating holes 10d of the first rotor core block portion 11 and the second rotor core block portion 12 partially overlap when viewed from the Z direction. In each of the magnetic poles MP of the multiple rotor core block portions 10a, the other-side filled resin portions 32 of the one-side magnet accommodating holes 10d of the first rotor core block portion 11 and the second rotor core block portion 12 do not overlap when viewed from the Z direction. In each of the magnetic poles MP of the multiple rotor core block portions 10a, the one-side filled resin portions 31 of the other-side magnet accommodating holes 10e of the first rotor core block portion 11 and the second rotor core block portion 12 do not overlap when viewed from the Z direction. In each of the magnetic poles MP of the multiple rotor core block portions 10a, the other-side filled resin portions 32 of the other-side magnet accommodating holes 10e of the first rotor core block portion 11 and the second rotor core block portion 12 partially overlap when viewed from the Z direction. Note that in each of the magnetic poles MP of the multiple rotor core block portions 10a, the one-side filled resin portion 31 of the other-side magnet accommodating hole 10e of the first rotor core block portion 11 and the other-side filled resin portion 32 of the one-side magnet accommodating hole 10d of the second rotor core block portion 12 partially overlap when viewed from the Z direction.

[0036] As shown in Figure 4, the magnet filling section 30 includes an inter-magnet resin filling section 33 which is resin filled between the permanent magnets 20 arranged so that they are offset from each other by a predetermined angle in the C direction and spaced apart from each other in the Z direction.

[0037] (Configuration of flow channel plate) As shown in Fig. 1, the rotor 100 includes a flow path plate 40 disposed between the first rotor core block portion 11 and the second rotor core block portion 12 in the Z direction. As shown in Fig. 5, the flow path plate 40 includes a through hole having the same shape and size as the through hole 10b of the rotor core block portion 10a when viewed from the Z direction. As shown in Fig. 4, the flow path plate 40 includes a connecting resin flow path 41 filled with resin so as to connect the one-side filling resin portions 31 and the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12 that are shifted from each other by a predetermined angle in the C direction.

[0038] The connecting resin flow path 41 includes a one-side connecting resin flow path 41a and an other-side connecting resin flow path 41b. The one-side connecting resin flow path 41a connects the one-side filling resin portions 31 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other by a predetermined angle in the C direction. The other-side connecting resin flow path 41b connects the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other by a predetermined angle in the C direction.

[0039] Specifically, the one-side connecting resin flow path 41a corresponding to the one-side magnet accommodating hole 10d connects the one-side filled resin portions 31 of the one-side magnet accommodating holes 10d of the first rotor core block portion 11 and the second rotor core block portion 12. The other-side connecting resin flow path 41b corresponding to the one-side magnet accommodating hole 10d and the one-side connecting resin flow path 41a corresponding to the other-side magnet accommodating hole 10e connect the other-side filled resin portion 32 in the one-side magnet accommodating hole 10d of the first rotor core block portion 11, the other-side filled resin portion 32 in the one-side magnet accommodating hole 10d of the second rotor core block portion 12, the one-side filled resin portion 31 in the other-side magnet accommodating hole 10e of the first rotor core block portion 11, and the one-side filled resin portion 31 in the one-side magnet accommodating hole 10d of the second rotor core block portion 12. That is, the other-side connecting resin flow path 41b corresponding to the one-side magnet accommodating hole 10d also serves as the one-side connecting resin flow path 41a corresponding to the other-side magnet accommodating hole 10e. The other-side connecting resin flow path 41b corresponding to the other-side magnet accommodating hole 10e connects the other-side filled resin portions 32 of the other-side magnet accommodating holes 10e of the first rotor core block portion 11 and the second rotor core block portion 12.

[0040] 5, the one-side connecting resin flow path 41a and the other-side connecting resin flow path 41b corresponding to the same magnet accommodating hole 10c are not connected. Specifically, the one-side connecting resin flow path 41a corresponding to the one-side magnet accommodating hole 10d, the other-side connecting resin flow path 41b corresponding to the one-side magnet accommodating hole 10d (the one-side connecting resin flow path 41a corresponding to the other-side magnet accommodating hole 10e), and the other-side connecting resin flow path 41b corresponding to the other-side magnet accommodating hole 10e are not connected. In other words, a plurality of connecting resin flow paths 41 are formed for each magnetic pole MP so as not to communicate with each other.

[0041] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0042] In this embodiment, as described above, the permanent magnets 20 of the first rotor core block portion 11 and the second rotor core block portion 12, which are offset from each other by a predetermined angle in the C direction, are arranged so as to be spaced apart from each other in the Z direction. The rotor 100 is provided with inter-magnet resin filling portions 33, which are resin filled between the permanent magnets 20 arranged so as to be spaced apart from each other in the Z direction. This makes it easy to connect at least one of the one-side filling resin portions 31 of the first rotor core block portion 11 and the second rotor core block portion 12, which are offset from each other by a predetermined angle in the C direction, and the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12, which are offset from each other by a predetermined angle in the C direction, via the inter-magnet resin filling portions 33. Furthermore, even if at least one of the one-side filling resin portions 31 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other by a predetermined angle in the C direction and at least one of the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other by a predetermined angle in the C direction are not connected via the inter-magnet resin filling portion 33, the one-side filling resin portion 31 of the first rotor core block portion 11 and the other-side filling resin portion 32 of the second rotor core block portion 12 that correspond to the permanent magnets 20 that are offset from each other by a predetermined angle in the C direction are likely to be connected via the inter-magnet resin filling portion 33, or the other-side filling resin portion 32 of the first rotor core block portion 11 and the one-side filling resin portion 31 of the second rotor core block portion 12 that correspond to the permanent magnets 20 that are offset from each other by a predetermined angle in the C direction are likely to be connected. As a result, when multiple rotor core block portions 10a are stacked in the Z direction, resin can be filled all at once throughout the entire gaps inside each of the multiple magnet accommodating holes 10c of all of the multiple rotor core block portions 10a where no permanent magnets 20 are placed, while preventing the creation of areas where the resin is difficult to reach.

[0043] Furthermore, in this embodiment, as described above, the rotor 100 is provided with a flow path plate 40 that is disposed between the first rotor core block portion 11 and the second rotor core block portion 12 in the Z direction and includes a connecting resin flow path 41 filled with resin so as to connect the one-side filling resin portions 31 and the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other by a predetermined angle in the C direction. This makes it possible to connect the one-side filling resin portions 31 and the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other by a predetermined angle in the C direction via the connecting resin flow path 41 of the flow path plate 40. This allows resin to be filled in all at once throughout the entire gaps where no permanent magnets 20 are placed inside each of the multiple magnet accommodating holes 10c of all of the multiple rotor core block portions 10a, including the first rotor core block portion 11 and the second rotor core block portion 12, while reliably preventing the creation of areas where the resin has difficulty reaching when the multiple rotor core block portions 10a are stacked in the Z direction.

[0044] Furthermore, in this embodiment, as described above, the first rotor core block portion 11 and the second rotor core block portion 12 are arranged so that at least one of the one-side filling resin portions 31 and the other-side filling resin portions 32 that are offset from each other by a predetermined angle in the C direction do not overlap when viewed from the Z direction. This makes it possible to effectively connect the one-side filling resin portions 31 and the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other by a predetermined angle in the C direction via the connecting resin flow path 41 of the flow path plate 40.

[0045] Furthermore, in this embodiment, as described above, a plurality of connecting resin flow paths 41 are formed for each magnetic pole MP so as not to communicate with one another. This makes it possible to reduce the area of ​​the connecting resin flow path 41 in the flow path plate 40 compared to when only one connecting resin flow path is formed for each magnetic pole. This makes it possible to prevent a decrease in the mechanical strength of the flow path plate 40.

[0046] In the present embodiment, as described above, the multiple magnet accommodating holes 10c include one-side magnet accommodating holes 10d and other-side magnet accommodating holes 10e located on the C1 side and the C2 side, respectively, in each of the magnetic poles MP of each of the multiple rotor core block portions 10a. In each of the magnetic poles MP, the other-side connecting resin flow passage 41b corresponding to the one-side magnet accommodating hole 10d and the one-side connecting resin flow passage 41a corresponding to the other-side magnet accommodating hole 10e connect the other-side filling resin portion 32 in the one-side magnet accommodating hole 10d of the first rotor core block portion 11, the other-side filling resin portion 32 in the one-side magnet accommodating hole 10d of the second rotor core block portion 12, the one-side filling resin portion 31 in the other-side magnet accommodating hole 10e of the first rotor core block portion 11, and the one-side filling resin portion 31 in the other-side magnet accommodating hole 10e of the second rotor core block portion 12. This makes it possible to form a second-side connecting resin flow path 41b corresponding to the first-side magnet accommodating hole 10d and a first-side connecting resin flow path 41a corresponding to the second-side magnet accommodating hole 10e in each of the magnetic poles MP of the multiple rotor core block portions 10a, even when the distance between the first-side magnet accommodating hole 10d and the second-side magnet accommodating hole 10e is relatively short, or when the second-side filling resin portion 32 in the first-side magnet accommodating hole 10d of the second rotor core block portion 12 and the first-side filling resin portion 31 in the second-side magnet accommodating hole 10e of the first rotor core block portion 11 overlap in the Z direction.

[0047] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than the above description of the embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0048] For example, in the above embodiment, an example was shown in which the rotor 100 is provided with the flow path plate 40, which is disposed between the first rotor core block portion 11 and the second rotor core block portion 12 in the Z direction and includes a connecting resin flow path 41 filled with resin so as to connect the one-side filling resin portions 31 and the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other in the C direction by a predetermined angle, but the present invention is not limited to this. In the present invention, as in a first modified example shown in Fig. 6 , the rotor 200 does not have to include the flow path plate 40, which is disposed between the first rotor core block portion 11 and the second rotor core block portion in the Z direction and includes a connecting resin flow path 41 filled with resin so as to connect the one-side filling resin portions 31 and the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other in the C direction by a predetermined angle.

[0049] In the above embodiment, an example has been shown in which the first rotor core block portion 11 and the second rotor core block portion 12 are arranged so that at least one of the one-side filling resin portions 31 and the other-side filling resin portions 32, which are offset from each other by a predetermined angle in the C direction (circumferential direction), do not overlap when viewed from the Z direction (axial direction), but the present invention is not limited to this. In the present invention, the first rotor core block portion and the second rotor core block portion may be arranged so that both the one-side filling resin portions and the other-side filling resin portions, which are offset from each other by a predetermined angle in the circumferential direction, overlap when viewed from the axial direction.

[0050] Furthermore, in the above embodiment, an example was shown in which a plurality of connecting resin flow paths 41 were formed for each magnetic pole MP so as not to communicate with each other, but the present invention is not limited to this. In the present invention, as in a rotor 300 of a second modified example shown in FIG. 7 , only one connecting resin flow path 341 may be formed for each magnetic pole MP. In FIG. 7 , the flow path plate 340 of the rotor 300 includes a connecting resin flow path 341 that connects the one-side filling resin portion 31 and the other-side filling resin portion 32 in the one-side magnet accommodating hole 10d of the first rotor core block portion 11, the one-side filling resin portion 31 and the other-side filling resin portion 32 in the one-side magnet accommodating hole 10d of the second rotor core block portion 12, the one-side filling resin portion 31 and the other-side filling resin portion 32 in the other-side magnet accommodating hole 10e of the first rotor core block portion 11, and the one-side filling resin portion 31 and the other-side filling resin portion 32 in the other-side magnet accommodating hole 10e of the second rotor core block portion 12. That is, the one-side connecting resin flow path and the other-side connecting resin flow path corresponding to the same magnet accommodating hole 10c are not connected.

[0051] In addition, in the above embodiment, an example was shown in which, in each of the magnetic poles MP, the other-side connecting resin flow path 41b corresponding to the one-side magnet accommodating hole 10d and the one-side connecting resin flow path 41a corresponding to the other-side magnet accommodating hole 10e connect the other-side filling resin portion 32 in the one-side magnet accommodating hole 10d of the first rotor core block portion 11, the other-side filling resin portion 32 in the one-side magnet accommodating hole 10d of the second rotor core block portion 12, the one-side filling resin portion 31 in the other-side magnet accommodating hole 10e of the first rotor core block portion 11, and the one-side filling resin portion 31 in the other-side magnet accommodating hole 10e of the second rotor core block portion 12, but the present invention is not limited to this. In the present invention, in each magnetic pole MP, the other-side connecting resin flow path corresponding to the one-side magnet accommodating hole connects the other-side filled resin portion in the one-side magnet accommodating hole of the first rotor core block portion to the other-side filled resin portion in the one-side magnet accommodating hole of the second rotor core block portion, and the one-side connecting resin flow path corresponding to the other-side magnet accommodating hole connects the one-side filled resin portion in the other-side magnet accommodating hole of the first rotor core block portion to the one-side filled resin portion in the other-side magnet accommodating hole of the second rotor core block portion, and the other-side connecting resin flow path corresponding to the one-side magnet accommodating hole and the one-side connecting resin flow path corresponding to the other-side magnet accommodating hole may not be connected.

[0052] In the above embodiment, the size W1 of the permanent magnet 20 in the Z direction is smaller than the size W2 of the rotor core block portion 10a in the Z direction, but the present invention is not limited to this. In the present invention, the size W1 of the permanent magnet 20 in the Z direction may be equal to the size W2 of the rotor core block portion 10a in the Z direction, as in a rotor 400 of a third modified example shown in Fig. 8. 8, the rotor 400 further includes a flow path plate 440 that is disposed between the first rotor core block portion 11 and the second rotor core block portion 12 in the Z direction, and that includes connecting resin flow paths 441 filled with resin to connect the one-side filling resin portions 31 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other in the C direction by a predetermined angle and the other-side filling resin portions 32 of the first rotor core block portion 11 and the second rotor core block portion 12 that are offset from each other in the C direction by a predetermined angle, and to connect the connected portions of the one-side filling resin portions 31 and the connected portions of the other-side filling resin portions 32 that are offset from each other in the C direction by a predetermined angle to form inter-magnet resin-filled portions 433. As a result, the connecting resin flow paths 41 of the flow path plate 40 can form the inter-magnet resin-filled portions 333 even if the size W1 of the permanent magnet 20 in the Z direction is not smaller than the size W2 of the rotor core block portion 10a in the Z direction. This allows the size of the permanent magnet 20 to be relatively large, thereby improving the magnetic performance of the rotor 400.

[0053] In the above embodiment, an example has been shown in which the first rotor core block portion 11, the second rotor core block portion 12, the second rotor core block portion 12, and the first rotor core block portion 11 are stacked in this order from the Z1 side toward the Z2 side, but the present invention is not limited to this. In the present invention, as in a rotor 500 of a fourth modified example shown in Fig. 9, the first rotor core block portion 11, the second rotor core block portion 12, the first rotor core block portion 11, and the second rotor core block portion 12 may be stacked in this order from the Z1 side toward the Z2 side. Also, the second rotor core block portion, the first rotor core block portion 11, and the second rotor core block portion may be stacked in this order from the Z1 side toward the Z2 side. Furthermore, the second rotor core block portion, the first rotor core block portion, the second rotor core block portion, and the first rotor core block portion 11 may be stacked in this order from the Z1 side toward the Z2 side.

[0054] In the above embodiment, an example has been shown in which the rotor core 10 has four rotor core block portions 10a stacked in the Z direction (axial direction), but the present invention is not limited to this. In the present invention, the rotor core may have two, three, five or more rotor core block portions stacked in the axial direction.

[0055] In the above embodiment, one magnetic pole MP is formed by the plurality of permanent magnets 20 arranged in two magnet accommodating holes 10c (one-side magnet accommodating hole 10d and the other-side magnet accommodating hole 10e) in each of the plurality of rotor core block portions 10a. However, the present invention is not limited to this. In the present invention, one magnetic pole may be formed by one or more permanent magnets arranged in one magnet accommodating hole in each of the plurality of rotor core block portions. Alternatively, as in a rotor 600 of a fifth modified example shown in FIG. 10, one magnetic pole MP may be formed by the plurality of permanent magnets 20 arranged in three or more magnet accommodating holes 10c. In FIG. 10, one magnetic pole MP is formed by the plurality of permanent magnets 20 arranged in the two magnet accommodating holes 10c arranged on the R2 side (one-side magnet accommodating hole 10d and the other-side magnet accommodating hole 10e) and the two magnet accommodating holes 10c arranged on the R1 side (one-side magnet accommodating hole and the other-side magnet accommodating hole). Each of the two magnet accommodating holes 10c arranged on the R1 side is larger than each of the two magnet accommodating holes 10c arranged on the R2 side. One permanent magnet 20 is arranged in each of the two magnet accommodating holes 10c arranged on the R2 side, and two permanent magnets 20 are arranged in each of the two magnet accommodating holes 10c arranged on the R1 side. [Explanation of symbols]

[0056] 10...rotor core, 10b...rotor core block portion, 11...first rotor core block portion, 12...second rotor core block portion, 10c...magnet accommodating hole, 20...permanent magnet, 31...one side filled resin portion, 32...other side filled resin portion, 33, 433...resin filled portion between magnets, 40...flow path plate, 41, 341, 441...connecting resin flow path, 41a...one side connecting resin flow path, 41b...other side connecting resin flow path, 100, 200, 300, 400, 500, 600...rotor core, MP...magnetic pole

Claims

1. a rotor core in which a plurality of rotor core block portions, each having a plurality of magnet accommodating holes, are stacked in the axial direction; a plurality of permanent magnets arranged in each of the plurality of magnet accommodating holes and forming magnetic poles; a one-side filled resin portion and an other-side filled resin portion, which are resin filled on one side and the other side of the permanent magnet in a longitudinal direction, respectively, inside each of the plurality of magnet accommodating holes of each of the plurality of rotor core block portions, the plurality of rotor core block portions include a first rotor core block portion and a second rotor core block portion, the positions of the magnetic poles of the rotor core block portions being shifted from each other by a predetermined angle in the circumferential direction and arranged adjacent to each other in the axial direction, the permanent magnets of the first rotor core block portion and the second rotor core block portion that are shifted from each other in the circumferential direction by the predetermined angle are arranged so as to at least partially overlap when viewed from the axial direction, and are arranged so as to be spaced apart from each other in the axial direction, The rotor further includes an inter-magnet resin filling portion, which is the resin filled between the permanent magnets arranged to be spaced apart from each other in the axial direction.

2. 2. The rotor according to claim 1, further comprising a flow path plate disposed between the first rotor core block portion and the second rotor core block portion in the axial direction, the flow path plate including a connecting resin flow path filled with the resin so as to connect the one-side filling resin portions and the other-side filling resin portions of the first rotor core block portion and the second rotor core block portion that are offset from each other in the circumferential direction by the predetermined angle.

3. a size of the permanent magnet in the axial direction is equal to a size of the rotor core block portion in the axial direction, 2. The rotor according to claim 1, further comprising: a flow path plate that is arranged between the first rotor core block portion and the second rotor core block portion in the axial direction, that connects the one-side filling resin portions of the first rotor core block portion and the second rotor core block portion that are offset from each other in the circumferential direction by the predetermined angle, and that connects the other-side filling resin portions of the first rotor core block portion and the second rotor core block portion that are offset from each other in the circumferential direction by the predetermined angle, and that connects a portion where the one-side filling resin portions are connected to a portion where the other-side filling resin portions that are offset from each other in the circumferential direction by the predetermined angle are connected to form the inter-magnet resin filling portion.

4. The rotor according to claim 2 , wherein a plurality of said connecting resin channels are formed for each of said magnetic poles so as not to communicate with each other.

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