Method of manufacturing rotor and apparatus for manufacturing rotor

Abstract

To provide a method of a manufacturing a rotor and a an apparatus for manufacturing a rotor that can suppress an eddy current that is generated in a pair of magnets in the case of using a rotor in a synchronous motor.SOLUTION: A method of manufacturing a rotor manufactures a rotor by injecting a resin material into a magnet housing hole 15 to fix a pair of magnets 17, with a core 13 having the magnet housing hole 15 positioned between a first mold 22 and a second mold 23, and the magnets 17 housed in the magnet housing hole 15. The method of manufacturing of a rotor comprises: a magnet housing step of housing the pair of magnets 17 into the magnet housing hole 15; a gap formation step of forming a gap 19 between the pair of magnets 17 housed in the magnet housing hole 15; a molding step of molding the first mold 22 and the second mold 23 such that the core 13 with the pair of magnets 17 housed in the magnet housing hole 15 is held between the first mold 22 and the second mold 23; and an injection step of injecting a resin material into the magnet housing hole 15 in the core 13 held by the first mold 22 and the second mold 23 in a clamped state.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method and an apparatus for manufacturing a rotor, for example, of a synchronous motor. [Background technology]

[0002] Conventionally, a rotor manufacturing method is known, for example, as shown in Patent Document 1. Such a rotor has a core structure in which a plurality of core pieces are stacked. The core has a plurality of magnet accommodating holes that penetrate in the stacking direction of the core pieces. Then, each magnet accommodating hole is filled with a resin material with the magnet accommodated therein, thereby fixing the magnet.

[0003] In a synchronous motor that uses a rotor with such a built-in magnet (permanent magnet), the alternating magnetic flux generated by the coil on the stator side penetrates the magnet on the rotor side. This causes large eddy currents to occur in the magnet, which increases the loss of the synchronous motor. To solve this problem, it is known to suppress the generation of eddy currents by dividing the magnet. However, if the divided magnets come into contact with each other, there is a risk that large eddy currents will occur in the magnet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-140841 A Summary of the Invention [Problem to be solved by the invention]

[0005] That is, in the manufacturing method of the rotor as described above, if the magnet to be accommodated in the magnet accommodating hole is divided into two, there is a risk that large eddy currents will be generated in the magnet if the two divided magnets come into contact with each other in the magnet accommodating hole. Therefore, when the rotor is used in a synchronous motor, there is still room for improvement in suppressing eddy currents generated in the magnet. [Means for solving the problem]

[0006] The means for solving the above problems and their effects will be described below. A rotor manufacturing method that solves the above-mentioned problems is a rotor manufacturing method that manufactures a rotor by placing a core having a magnet accommodating hole between a first mold and a second mold arranged opposite each other, and accommodating a pair of magnets in the magnet accommodating hole, and then injecting a resin material into the magnet accommodating hole to fix the magnets, and is characterized by comprising a magnet accommodating process that accommodates the pair of magnets in the magnet accommodating hole, a gap forming process that forms a gap between the pair of magnets accommodated in the magnet accommodating hole, a mold clamping process that clamps the first mold and the second mold so that the core with the pair of magnets accommodated in the magnet accommodating hole is sandwiched between the first mold and the second mold, and an injection process that injects the resin material into the magnet accommodating hole of the core sandwiched between the first mold and the second mold in the clamped state.

[0007] Generally, in a synchronous motor using magnets (permanent magnets), there is a problem that the alternating magnetic flux generated by the coil on the stator side penetrates the magnet on the rotor side, generating large eddy currents in the magnets and increasing the loss of the synchronous motor. To solve this problem, it is known to suppress the generation of eddy currents by dividing the magnets, but if the divided magnets come into contact with each other, large eddy currents may be generated in the magnets. In this regard, according to the above method, a pair of magnets housed in a magnet housing hole can be fixed with a resin material with a gap formed between the pair of magnets. Therefore, when the rotor is used in a synchronous motor, the eddy currents generated in the pair of magnets can be suppressed.

[0008] The rotor manufacturing apparatus that solves the above-mentioned problems is a rotor manufacturing apparatus that manufactures a rotor by clamping a first mold and a second mold arranged opposite each other in the axial direction so that a core having a pair of magnets accommodated in a magnet accommodating hole formed by penetrating in the axial direction, and then injecting resin material into the magnet accommodating hole to fix the pair of magnets, and the apparatus is characterized in that the rotor manufacturing apparatus is provided with a gap forming section that forms a gap between the pair of magnets by coming into contact with the pair of magnets when the first mold and the second mold are clamped so that the core is sandwiched between at least the first mold and the second mold.

[0009] Generally, in a synchronous motor using magnets (permanent magnets), there is a problem that the alternating magnetic flux generated by the coil on the stator side penetrates the magnet on the rotor side, generating large eddy currents in the magnets and increasing losses in the synchronous motor. To solve this problem, it is known to suppress the generation of eddy currents by dividing the magnets, but if the divided magnets come into contact with each other, large eddy currents may be generated in the magnets. In this regard, according to the above configuration, the pair of magnets housed in the magnet housing hole can be fixed by resin material with a gap formed between the pair of magnets by the gap forming portion. Therefore, when the rotor is used in a synchronous motor, the eddy currents generated in the pair of magnets can be suppressed. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view of a rotor manufactured by a rotor manufacturing method according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a cross-sectional view of the rotor of FIG. [Diagram 3] 10 is a cross-sectional view showing a state in which the core supported by the support member is placed between the first and second dies which have been opened. FIG. [Figure 4] 10 is a cross-sectional view showing a state when the first and second dies are clamped so that the core supported by the support member is sandwiched between the first and second dies. FIG. [Diagram 5] FIG. 5 is an enlarged view of a main part of FIG. 3 and FIG. [Figure 6] FIG. [Figure 7] 13 is an enlarged schematic cross-sectional view showing a main part of a rotor manufacturing apparatus according to a modified example. FIG. [Figure 8] 13 is an enlarged schematic cross-sectional view showing a main part of a rotor manufacturing apparatus according to a modified example. FIG. [Figure 9] 13 is an enlarged schematic cross-sectional view showing a main part of a rotor manufacturing apparatus according to a modified example. FIG. [Figure 10] 13 is an enlarged schematic cross-sectional view showing a main part of a rotor manufacturing apparatus according to a modified example. FIG. [Figure 11] 13 is an enlarged schematic cross-sectional view showing a main part of a rotor manufacturing apparatus according to a modified example. FIG. [Figure 12] 13 is an enlarged schematic cross-sectional view showing a main part of a rotor manufacturing apparatus according to a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An embodiment will now be described with reference to the drawings. <Rotor 11> 1 and 2, rotor 11 includes core 13 formed by laminating a plurality of iron core pieces 12 made of circular electromagnetic steel plates. That is, core 13 is configured as a laminate formed by laminating a plurality of iron core pieces 12. Core 13 has a central hole 14 and a plurality of magnet accommodating holes 15 (20 in this embodiment) located on the outer periphery of central hole 14 and spaced apart from one another in the circumferential direction.

[0012] The central hole 14 and each magnet accommodating hole 15 are formed penetrating the core 13 in the direction in which the axis C of the core 13 extends (axial direction). That is, the central hole 14 and each magnet accommodating hole 15 extend along the axis C of the core 13 in a manner penetrating the core 13. A pair of protrusions 16 facing each other in the radial direction of the core 13 are provided on the inner peripheral surface of the central hole 14 so as to extend along the axis C. When viewed from the direction in which the axis C extends, each magnet accommodating hole 15 has a substantially rectangular shape with both longitudinal ends rounded.

[0013] In each magnet accommodating hole 15, a pair of rectangular parallelepiped magnets 17 (permanent magnets) are accommodated side by side so as not to come into contact with each other. That is, a gap 19 is formed between the pair of magnets 17 in each magnet accommodating hole 15. The pair of magnets 17 accommodated in each magnet accommodating hole 15 is coated with an insulating coating agent 20 (see FIG. 6). The pair of magnets 17 in each magnet accommodating hole 15 are arranged in a position extending obliquely with respect to the axis C so as to become farther away from each other from the lower end side (one end side) to the upper end side (the other end side) in the axial direction of the core 13.

[0014] That is, the pair of magnets 17 in each magnet accommodating hole 15 are arranged in a generally V-shaped orientation extending obliquely with respect to the axis C such that the gap 19 becomes larger from the lower end side to the upper end side in the axial direction of the core 13. The inside of each magnet accommodating hole 15 is filled with a thermoplastic resin material 18 for fixing the pair of magnets 17. The resin material 18 is made of, for example, polypropylene.

[0015] <Rotor 11 manufacturing device 21> 3, the manufacturing apparatus 21 for the rotor 11 includes a first die 22 and a second die 23 arranged opposite to each other in the vertical direction Z. Then, in a state where the first die 22 and the second die 23 are clamped together so that the core 13, in which a pair of magnets 17 is accommodated in each magnet accommodating hole 15, is sandwiched between the first die 22 and the second die 23, resin material 18 is injected into each magnet accommodating hole 15 to fix the pair of magnets 17, thereby manufacturing the rotor 11. In this case, the core 13 is arranged between the first die 22 and the second die 23 in such a manner that the axial direction thereof coincides with the vertical direction Z.

[0016] <Type 1 22> 3, the first die 22 includes a first die body 25, a support member 24, and a work spacer 26. The first die 22 has a structure in which the first die body 25, the support member 24, and the work spacer 26 are stacked in the vertical direction Z.

[0017] <Support member 24> 3, the support member 24 is placed on the first mold body 25. The support member 24 includes a substantially rectangular plate-shaped base portion 27 and a cylindrical post portion 28 standing in the center of the upper surface of the base portion 27. The support member 24 supports the core 13 by inserting the post portion 28 into the central hole 14 of the core 13. The upper end portion of the post portion 28 protrudes slightly upward from the upper surface of the core 13.

[0018] The lower surface of the base portion 27 contacts the upper surface of the first die body 25. The upper surface of the base portion 27 contacts the lower surface of the core 13 via the work spacer 26. A pair of engagement grooves (not shown) into which the pair of protrusions 16 (see FIG. 1) of the core 13 are respectively engaged are provided on the outer circumferential surface of the post portion 28 so as to extend along the axis C. The pair of protrusions 16 of the core 13 are respectively inserted into the pair of engagement grooves (not shown) of the post portion 28, whereby the core 13 is positioned in the circumferential direction relative to the post portion 28.

[0019] <Work Spacer 26> 3, the work spacer 26 has a generally rectangular plate shape smaller than the base portion 27. A circular through hole 29 into which the post portion 28 of the support member 24 is inserted is provided in the center of the work spacer 26. The work spacer 26 is disposed on the base portion 27 with the post portion 28 inserted into the through hole 29. The work spacer 26 is disposed in such a manner that its upper surface contacts the lower surface of the core 13 and its lower surface contacts the upper surface of the base portion 27.

[0020] A pair of first engaging protrusions (not shown) facing each other in the radial direction of the through hole 29 are provided on the inner circumferential surface of the through hole 29 of the work spacer 26. The pair of first engaging protrusions (not shown) engage with a pair of engaging grooves (not shown) on the outer circumferential surface of the post portion 28, thereby positioning the work spacer 26 in the circumferential direction with respect to the post portion 28. The work spacer 26 closes the lower end openings 30 of each magnet accommodating hole 15 of the core 13.

[0021] 3 and 5, convex portions 31 are provided on the upper surface of the work spacer 26 at positions corresponding to each magnet accommodating hole 15 of the core 13. Each convex portion 31 has a semicircular shape in a cross-sectional view and is provided integrally with the work spacer 26. Each convex portion 31 is disposed at a position corresponding to the longitudinal center of the magnet accommodating hole 15. Each convex portion 31 constitutes a gap forming portion that forms a gap 19 between the pair of magnets 17 by coming into contact with the lower surfaces of the pair of magnets 17 accommodated in the magnet accommodating hole 15.

[0022] That is, when a pair of magnets 17 are inserted into each magnet accommodating hole 15 of the core 13 so as to be aligned in the longitudinal direction of the magnet accommodating hole 15, when the inner ends of the lower surfaces of the pair of magnets 17 rest on the protrusions 31 of the work spacer 26, the pair of magnets 17 tilt outward so as to move away from each other. As a result, a gap 19 is formed between the pair of magnets 17.

[0023] <2nd type 23> 3 and 4, the second die 23 includes a second die body 32 and a gate plate 33. The gate plate 33 is plate-shaped and is interposed between the second die body 32 and the core 13. A substantially circular recess 34 is formed in the center of the lower surface of the gate plate 33, into which the upper end of the post portion 28 that protrudes above the upper surface of the core 13 is inserted when the first die 22 and the second die 23 are clamped together.

[0024] A pair of second engaging protrusions 35 are provided on the side surface of the recess 34, which respectively engage with a pair of engaging grooves (not shown) of the post portion 28. The pair of second engaging protrusions 35 of the recess 34 of the gate plate 33 are inserted into the pair of engaging grooves (not shown) of the post portion 28, respectively, whereby the post portion 28 is positioned relative to the gate plate 33 in the circumferential direction.

[0025] The gate plate 33 is disposed on the core 13 so as to close the upper end openings 36 of each magnet accommodating hole 15. The lower surface of the gate plate 33 contacts the upper surface of the core 13. The gate plate 33 has a plurality of branch passages 38 that supply the molten resin material 18 from cylinders 37 provided in the second mold body 32 to the plurality of magnet accommodating holes 15, respectively.

[0026] The multiple branch passages 38 extend radially from a central position on the axis C of the gate plate 33 so as to respectively correspond to the multiple magnet accommodating holes 15. The downstream end of each branch passage 38 serves as an injection port 39 facing the upper end opening 36 of the magnet accommodating hole 15. Molten resin material 18 is injected into the magnet accommodating hole 15 from each injection port 39.

[0027] <Method of manufacturing the rotor 11> The manufacturing method of the rotor 11 includes a supporting step, a magnet housing step, a gap forming step, a mold clamping step, an injection step, and a removal step.

[0028] <Support process> 3, in the supporting step, the post portion 28 of the supporting member 24 is inserted into the through hole 29 of the work spacer 26, and then the post portion 28 of the supporting member 24 is further inserted into the central hole 14 of the core 13, thereby supporting the core 13 by the supporting member 24. The core 13 in a state supported by the supporting member 24 is placed on the first die body 25.

[0029] <Magnet housing process> As shown in FIG. 3, in the magnet inserting step, a pair of magnets 17 are inserted from upper end openings 36 into the magnet accommodating holes 15 of the core 13 supported by the support members 24 in the supporting step.

[0030] <Gap formation process> 3 and 5, in the gap forming process, the lower end portions of the pair of magnets 17 inserted into each magnet accommodating hole 15 are placed on the protrusions 31 of the work spacer 26, thereby tilting the pair of magnets 17 away from each other. This forms a gap 19 between the pair of magnets 17. At this time, the pair of magnets 17 inserted into each magnet accommodating hole 15 are positioned so that they do not come into contact with each other at all. The gap forming process may be performed simultaneously with the magnet accommodating process.

[0031] <Mold clamping process> 4, in the mold clamping process, a pair of magnets 17 is accommodated in each magnet accommodating hole 15, and the first mold 22 and the second mold 23 are clamped so that the core 13 supported by the support member 24 is sandwiched between the first mold 22 and the second mold 23. Then, the upper end of the post portion 28 is inserted into the recess 34 of the gate plate 33, and the lower surface of the gate plate 33 comes into contact with the upper surface of the core 13. At this time, each branch passage 38 of the gate plate 33 communicates with the magnet accommodating hole 15 of the core 13 at the injection port 39.

[0032] <Injection process> 4, in the injection process, molten resin material 18 is supplied from a cylinder 37 to each branch passage 38. As a result, the molten resin material 18 flows through each branch passage 38 and is injected into the magnet accommodating hole 15 via the injection port 39 and the upper end opening 36. That is, in the injection process, the molten resin material 18 is injected to fill each magnet accommodating hole 15 of the core 13 sandwiched between the first mold 22 and the second mold 23 in the mold clamping process.

[0033] Thereafter, the resin material 18 in each magnet accommodating hole 15 cools and solidifies, thereby fixing the pair of magnets 17 in each magnet accommodating hole 15 without contacting each other. In this way, the rotor 11 shown in Figures 1 and 2 is manufactured.

[0034] <Removal process> In the removal step, the first die 22 and the second die 23 are opened in order to remove the rotor 11 from the manufacturing apparatus 21. Then, the rotor 11 supported by the support member 24 is removed from between the first die 22 and the second die 23, and then the rotor 11 is removed from the support member 24. This provides the rotor 11 shown in FIGS. 1 and 2.

[0035] <Operation of the embodiment> Generally, in synchronous motors with magnets (permanent magnets) built into the rotor, the alternating magnetic flux generated by the coil on the stator side penetrates the magnet on the rotor side, causing large eddy currents in the magnet and increasing losses in the synchronous motor.To solve this problem, it is known to suppress the generation of eddy currents by dividing the magnet, but there is a risk of large eddy currents being generated in the magnet when the divided magnets come into contact with each other.

[0036] In this regard, according to the present embodiment, the pair of magnets 17 housed in the magnet housing hole 15 of the core 13 are fixed by the resin material 18 in a non-contact state by forming a gap 19 between them. Therefore, when the rotor 11 is used in a synchronous motor, eddy currents generated in the pair of magnets 17 are suppressed, and the loss of the synchronous motor is reduced.

[0037] <Effects of the embodiment> According to the embodiment described above in detail, the following effects are achieved. (1) The manufacturing method of rotor 11 includes a magnet accommodating process for accommodating a pair of magnets 17 in magnet accommodating holes 15, a gap forming process for forming a gap 19 between the pair of magnets 17, a mold clamping process for clamping first mold 22 and second mold 23 so that core 13 is sandwiched between first mold 22 and second mold 23, and an injection process for injecting resin material 18 into magnet accommodating holes 15 of core 13.

[0038] According to the above method, the pair of magnets 17 housed in the magnet accommodating hole 15 can be fixed by the resin material 18 in a non-contact state by forming a gap 19 between the pair of magnets 17. Therefore, when the rotor 11 is used in a synchronous motor, eddy currents generated in the pair of magnets 17 can be suppressed, thereby reducing losses in the synchronous motor.

[0039] (2) In the method of manufacturing rotor 11, pair of magnets 17 housed in magnet housing hole 15 are each coated with insulating coating agent 20. According to the above method, the pair of magnets 17 are insulated from each other by the coating agent 20. Therefore, even if the pair of magnets 17 come into contact with each other in the magnet accommodating hole 15, eddy currents generated in the pair of magnets 17 can be suppressed.

[0040] (3) The manufacturing apparatus 21 for the rotor 11 is provided with a gap forming portion that forms a gap 19 between the pair of magnets 17 by coming into contact with the pair of magnets 17 when the first die 22 and the second die 23 are clamped so that the core 13 is sandwiched between at least the first die 22 and the second die 23.

[0041] According to the above configuration, the pair of magnets 17 accommodated in the magnet accommodating hole 15 can be fixed by the resin material 18 in a non-contact state by forming the gap 19 between the pair of magnets 17 by the gap forming portion. Therefore, when the rotor 11 is used in a synchronous motor, the eddy current generated in the pair of magnets 17 can be suppressed, and the loss of the synchronous motor can be reduced.

[0042] (4) In the manufacturing apparatus 21 for the rotor 11, the gap forming portions are constituted by the respective protrusions 31 provided on the work spacer 26 of the first die 22. According to the above configuration, the configuration of the gap forming portion can be simplified.

[0043] <Example of change> The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other as long as they are not technically inconsistent.

[0044] As shown in FIG. 7, a wedge member 50 may be further provided as a gap forming portion at a position corresponding to each magnet accommodating hole 15 of the core 13 on the lower surface of the gate plate 33. In this case, an accommodating recess 51 for accommodating the wedge member 50 is provided on the lower surface of the gate plate 33, and the wedge member 50 is suspended from the bottom surface of the accommodating recess 51 by a spring 52. In this way, even if the pair of magnets 17 placed on the protrusion 31 fall off the protrusion 31 and the pair of magnets 17 come into contact with each other at their upper parts, the wedge member 50 enters between the upper parts of the pair of magnets 17, so that a gap 19 can be formed between the pair of magnets 17. Even if the magnet 17 gets stuck between the wedge member 50 and the protrusion 31, the spring 52 contracts, thereby reducing the compressive force applied to the magnet 17. The wedge member 50 may be detachably suspended from the accommodating recess 51 of the gate plate 33 by the spring 52.

[0045] As shown in Fig. 8, a protrusion 53 may be used as a gap forming portion instead of the protrusion 31. The protrusion 53 has a triangular shape in cross section and has a pair of support surfaces 54 that support the entire lower surfaces of the pair of magnets 17. In this case, the pair of support surfaces 54 are adjacent to each other, so that the pair of magnets 17 contact each other at one point on their lower ends. For this reason, it is preferable to coat at least one of the pair of magnets 17 with the coating agent 20. The protrusion 53 may be provided detachably with respect to the work spacer 26.

[0046] 9, a convex portion 55 having a triangular cross-sectional shape may be used as a gap forming portion instead of the convex portion 31. In this case, the convex portion 55 exerts the same function as the convex portion 31. The convex portion 55 may be provided detachably with respect to the work spacer 26.

[0047] 10, instead of the protrusions 31, protrusions 56 having a triangular cross-sectional shape may be provided as gap forming parts at positions corresponding to the magnet accommodating holes 15 of the core 13 on the underside of the gate plate 33. In this way, when the mold clamping step is performed, the protrusions 56 enter between the upper parts of the pair of magnets 17, so that the gap 19 can be formed between the pair of magnets 17. In other words, the gap forming step can be performed simultaneously with the mold clamping step. The protrusions 56 may be provided detachably with respect to the underside of the gate plate 33.

[0048] 11, a pair of support recesses 57 may be used as gap forming portions instead of the protrusions 31. The pair of support recesses 57 accommodate the lower ends of the pair of magnets 17 and are arranged side by side at a distance from each other. In this way, when the pair of magnets 17 are accommodated in the magnet accommodating hole 15, the lower ends of the pair of magnets 17 are inserted into the pair of support recesses 57, respectively, so that the gap 19 can be reliably formed between the pair of magnets 17.

[0049] 12, the pair of support recesses 57 in FIG. 11 may be configured to enter the magnet accommodating hole 15 from the lower end opening 30. In this case, the lower surfaces of the pair of magnets 17 supported by the pair of support recesses 57 are flush with the lower surface of the core 13. In this way, in addition to the effect of the case in FIG. 11, the pair of magnets 17 can be prevented from protruding out of the lower end opening 30 of the magnet accommodating hole 15.

[0050] Each protrusion 31 may be provided detachably on the work spacer 26. In this way, the protrusions 31 can be easily provided on the work spacer 26. Also, instead of the protrusions 31, another protrusion having a different shape from the protrusions 31 can be used as the gap forming portion, thereby improving the versatility of the work spacer 26.

[0051] Only one of the pair of magnets 17 housed in each magnet housing hole 15 may be coated with the coating agent 20 . The pair of magnets 17 housed in each magnet housing hole 15 does not need to be coated with the coating agent 20 .

[0052] The resin material 18 is not limited to a thermoplastic resin, and may be a thermosetting resin. [Explanation of symbols]

[0053] 11...Rotor 12...Iron core piece 13…Core 14...Center hole 15...Magnet receiving hole 16...Protrusion 17…Magnet 18...Resin material 19…Gap 20...Coating agent 21...Manufacturing equipment 22...Type 1 23...2nd type 24...Support member 25…Type 1 main body 26...Work spacer 27…Base section 28…Post Office 29…Through hole 30…Bottom opening 31, 53, 55, 56…Convex portions constituting the gap forming portion 32…Type 2 main body 33…Gate plate 34…Recess 35...Second engagement convex part 36…Top opening 37…Cylinder 38... Branch passage 39…Inlet 50...Wedge member 51...Housing recess 52…Spring 54...Support surface 57...Support recess C…Axis line Z: Vertical direction

Claims

1. A method for manufacturing a rotor, comprising: disposing a core having a magnet accommodating hole between a first die and a second die disposed opposite to each other; accommodating a pair of magnets in the magnet accommodating hole; and injecting a resin material into the magnet accommodating hole to fix the magnets, a magnet accommodating step of accommodating the pair of magnets in the magnet accommodating holes; a gap forming step of forming a gap between the pair of magnets accommodated in the magnet accommodating hole; a mold clamping process of clamping the first mold and the second mold so that the core in a state in which the pair of magnets are accommodated in the magnet accommodating hole is sandwiched between the first mold and the second mold; an injection step of injecting the resin material into the magnet accommodating hole of the core sandwiched between the first die and the second die in a clamped state; A manufacturing method of a rotor comprising:

2. 2. The method for manufacturing a rotor according to claim 1, wherein at least one of the pair of magnets housed in the magnet housing hole is coated with an insulating coating agent.

3. A rotor manufacturing device for manufacturing a rotor by injecting a resin material into the magnet accommodating hole to fix the pair of magnets in a state in which a first mold and a second mold are clamped so that a core, in which a pair of magnets are accommodated in a magnet accommodating hole formed by penetrating in the axial direction, is sandwiched between the first mold and the second mold arranged opposite to each other in the axial direction, the rotor being manufactured by the above-mentioned method, A rotor manufacturing apparatus characterized in that it is provided with a gap forming section that forms a gap between a pair of magnets by coming into contact with the pair of magnets when the first mold and the second mold are clamped so that the core is sandwiched between at least the first mold and the second mold.

4. 4. The rotor manufacturing apparatus according to claim 3, wherein the gap forming portion is constituted by a protrusion provided on at least one of the first die and the second die.

5. 5. The rotor manufacturing apparatus according to claim 4, wherein the protrusion is provided removably on at least one of the first die and the second die.

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