Method of manufacturing a tray member and a motor

Abstract

The present disclosure provides a tray member and a manufacturing method of a motor that can contribute to an increase in productivity in a motor core manufacturing process. A tray member that can be used in a heating process of a core, in which the tray member includes a plate portion having a first face on which the core is placed, and a first protruding portion that protrudes from a second face of the plate portion opposite the first face and inhibits heat conduction from the tray member to a support face that supports the tray member in a case where the core placed on the plate portion is heated.

Description

Technical Field

[0001] This disclosure relates to methods for manufacturing pallet components and motors. Background Technology

[0002] A rotating electric motor includes a motor core (e.g., a rotor core and a stator core; hereinafter, the rotor core and stator core will be collectively referred to as the core). Within the core, permanent magnets are mounted in multiple annular slots arranged at predetermined intervals. As a method for mounting permanent magnets into the core, it is known to insert the permanent magnets into the slots, then fill the surrounding area with resin and allow the resin to cure (e.g., see Japanese Patent No. 5939295 or Japanese Patent No. 7099936).

[0003] In the rotor manufacturing process, a tray component for holding the iron core is used. Patent Document 1 below discloses a sprue plate 2 that also serves as a tray for holding the stacked iron core 3. The lower surface of the sprue plate 2 has a device positioning part 25, which is configured to be connected to a predetermined position on the upper surface of the mold body part 110 of the resin delivery mold 11.

[0004] In addition, Japanese Patent No. 7099936 discloses a conveyor plate 153, which is a metal plate-shaped body configured to carry a laminate 11. Summary of the Invention

[0005] The problem that the invention aims to solve

[0006] Furthermore, in the motor core manufacturing process, the core is sometimes preheated using a heating device before the resin filling of the core's resin-filled portion. During this preheating process, heat dissipates from the plate holding the core through heat conduction, and the heating of the core takes time, leading to a decrease in the productivity of the motor core manufacturing process. Therefore, there is room for improvement in the productivity of the motor core manufacturing process.

[0007] In view of the above-mentioned problems, the present disclosure aims to provide a pallet component and a method for manufacturing a motor that can help improve productivity in the motor core manufacturing process.

[0008] Solution for solving the problem

[0009] To achieve the above objectives, the first solution of the present disclosure is a tray member that can be used in the heating process of an iron core, wherein the tray member comprises: a plate portion having a first surface for placing the iron core; and a first protrusion protruding from a second surface of the plate portion opposite to the first surface, and suppressing heat conduction from the tray member to the support surface supporting the tray member when the iron core placed on the plate portion is heated.

[0010] The second aspect of the disclosed technology is the tray component of the first aspect, wherein a first through hole is formed in the plate portion at a position opposite to the resin-filled portion of the iron core.

[0011] The third aspect of the present disclosure is the tray component of the second aspect, wherein the tray component is configured to also be used in a filling process of filling resin into the resin filling portion, wherein the resin is filled into the resin filling portion through the first through hole.

[0012] The fourth aspect of the present disclosure is the tray component of the first aspect, wherein the tray component is configured to also be used in a filling process of filling resin into a resin filling portion, and the first protrusion is configured to be inserted into a positioning hole located in a resin filling mold.

[0013] The fifth aspect of the technology disclosed herein is a tray component of the first aspect, wherein the plate portion has a second protrusion projecting from a first surface, the second protrusion being inserted into a hole formed in the iron core.

[0014] The sixth aspect of the disclosed technology is the pallet component of the fifth aspect, wherein a plurality of second protrusions are provided along the circumference of the iron core.

[0015] The seventh aspect of the present disclosure is the tray component of the first aspect, wherein the first protrusion includes a pin-shaped component, and a plurality of such pin-shaped components are provided along the outer edge of the plate portion.

[0016] The eighth aspect of the technology disclosed herein is a tray component of the first aspect, wherein the first protrusion includes a columnar component disposed in the central portion of the plate portion.

[0017] The ninth aspect of the technology disclosed herein is a tray component of the first aspect, wherein a second through hole is formed in the plate portion at a position corresponding to the central through hole of the iron core.

[0018] The tenth aspect of the present disclosure is a tray member of the ninth aspect, wherein the tray member has a third protrusion disposed along the periphery of the second through hole and protruding from the first surface.

[0019] The eleventh aspect of the present disclosure is a pallet component of the first aspect, wherein the pallet component is configured to also be used in a conveying process, and the first protrusion is configured to form a gap between the plate portion and the conveying surface.

[0020] The twelfth aspect of the present disclosure is a method for manufacturing a motor, which is a method for manufacturing a motor core using a tray member. The tray member includes: a plate portion having a first surface for mounting the core; and a first protrusion protruding from a second surface of the plate portion opposite to the first surface, and suppressing heat conduction from the tray member to a support surface supporting the tray member when the core mounted on the plate portion is heated. The method for manufacturing the motor includes: mounting the core on the tray member; and heating the core in the state of being mounted on the tray member.

[0021] The thirteenth aspect of the present disclosure is a tray member used in a preheating process of iron cores and a filling process of filling resin into the resin filling portions of the plurality of iron cores in a state in which the plurality of iron cores are arranged along the axial direction, wherein the tray member comprises: a plate portion having a first surface for a first iron core among the plurality of iron cores to be placed; and a first protrusion protruding from a second surface of the plate portion opposite to the first surface.

[0022] The fourteenth aspect of the present disclosure is a tray component of the thirteenth aspect, wherein, when a second iron core is disposed in the layer below the first iron core among a plurality of iron cores, the first protrusion is configured to be insertable into a hole formed in the second iron core.

[0023] The fifteenth aspect of the present disclosure is a tray component of the thirteenth aspect, wherein the plate portion has a second protrusion protruding from a first surface, the second protrusion being inserted into a hole formed in a first iron core.

[0024] The sixteenth aspect of the present disclosure is the tray component of the fourteenth and fifteenth aspects, wherein, when the hole formed in the second iron core is designated as the second hole and the hole formed in the first iron core is designated as the first hole, the first hole of the first iron core corresponds to the second hole of the second iron core.

[0025] The seventeenth aspect of the present disclosure is the pallet component of the fifteenth aspect, wherein the second protrusion is located on the opposite side of the first protrusion, separated by a plate portion.

[0026] The eighteenth aspect of the present disclosure is a tray component of the thirteenth aspect, wherein a first through hole is formed in the plate portion at a position opposite to the resin-filled portion of the first iron core.

[0027] The nineteenth aspect of the present disclosure is the tray component of the eighteenth aspect, wherein resin is filled into the resin filling portion through a first through hole.

[0028] The twentieth aspect of the present disclosure is the thirteenth aspect of the pallet component, wherein, in the plate portion, a second through hole is provided at a position corresponding to the central through hole of the first iron core.

[0029] The twentieth aspect of the present disclosure is a tray component of the thirteenth aspect, wherein, when the first iron core placed on the tray component is the lowest of a plurality of iron cores, the first protrusion is configured to be insertable into a positioning hole provided in a mold filled with resin.

[0030] The twenty-second aspect of the present disclosure is a method for manufacturing a motor, which is a method for manufacturing a motor core using a tray member. The tray member includes: a plate portion having a first surface for mounting a first core among a plurality of cores; and a first protrusion protruding from a second surface of the plate portion opposite to the first surface. The method for manufacturing the motor includes: preheating the core in a state where it is mounted on the tray member; and filling resin into the resin filling portion of each of the plurality of cores in a state where the plurality of cores are arranged axially with the tray member in between.

[0031] Invention Effects

[0032] According to this disclosure, a pallet component and a method for manufacturing a motor are provided that can help improve productivity in the motor core manufacturing process. Attached Figure Description

[0033] Figure 1 This is a schematic diagram illustrating a series of processes in the rotor core manufacturing procedure of the embodiment.

[0034] Figure 2 This is a perspective view showing the schematic structure of the rotor core and tray components in the embodiment.

[0035] Figure 3 This is a schematic diagram illustrating an example of the preheating of the rotor core in an embodiment.

[0036] Figure 4 This is a schematic diagram illustrating an example of the molding of the rotor core in an embodiment.

[0037] Figure 5 This is a flowchart illustrating an example of the rotor core manufacturing process in an embodiment.

[0038] Figure 6 This is a schematic diagram illustrating an example of the preheating of the rotor core in an embodiment.

[0039] Figure 7 This is a schematic diagram illustrating an example of the preheating of the rotor core in an embodiment.

[0040] Figure 8 This is a schematic diagram illustrating an example of the preheating of the rotor core in an embodiment.

[0041] Figure 9This is a schematic diagram illustrating an example of the preheating of the rotor core in an embodiment.

[0042] Figure 10 This is a schematic diagram illustrating an example of the preheating of the rotor core in an embodiment.

[0043] Figure 11 This is a schematic diagram illustrating an example of the molding of the rotor core in an embodiment.

[0044] Figure 12 This is a schematic diagram illustrating an example of the molding of the rotor core in an embodiment.

[0045] Figure 13 This is a schematic diagram illustrating an example of the molding of the rotor core in an embodiment.

[0046] Figure 14 This is a schematic diagram illustrating an example of the molding of the rotor core in an embodiment.

[0047] Figure 15 This is a schematic diagram illustrating an example of the molding of the rotor core in an embodiment. Detailed Implementation

[0048] Hereinafter, various embodiments for implementing this disclosure will be described with reference to the accompanying drawings. It should be noted that the scope of explanation required to achieve the purposes of this disclosure is shown schematically below, and the explanation mainly focuses on the scope of that part of this disclosure; parts omitted from the description are known technologies. Furthermore, identical or corresponding components in the drawings are labeled with the same or similar reference numerals, and repeated descriptions are omitted. Moreover, when a drawing contains multiple identical or corresponding components, sometimes only a few components are labeled for ease of observation.

[0049] <<First Implementation>>

[0050] <Overview of Rotor Manufacturing Process>

[0051] First, refer to Figure 1 The following is a summary of a series of processes in the rotor manufacturing procedure of this embodiment. Figure 1 This is a schematic diagram illustrating a series of processes in the rotor manufacturing procedure of this embodiment.

[0052] like Figure 1As shown, in the rotor manufacturing process, the rotor core 2 is transported or subjected to various processing and machining while mounted on the tray member 10. Details will be described later. The tray member 10 is a platform-shaped component capable of supporting the rotor core 2. The tray member 10 has a plate portion 12 for supporting the rotor core 2 and a lower surface 12B of the plate portion 12 (see reference). Figure 2 The first protrusion 14 is prominent. It should be noted that multiple pallet-shaped members can also be stacked to form the pallet member 10. The rotor core 2 is an example of the "core" of the present disclosure. The pallet member 10 is an example of the "pallet member" of the present disclosure.

[0053] For example, after the rotor core 2 is placed on the pallet member 10, it is conveyed by the conveyor C together with the pallet member 10. In other words, the pallet member 10 is configured to also be used in the conveying process of the rotor core 2. In this case, a gap is formed between the plate portion 12 and the conveying surface C1 (here, the upper surface of the conveyor belt of the conveyor C) by means of the first protrusion 14 provided on the pallet member 10. In other words, contact between the lower surface of the plate portion 12 and the conveying surface C1 of the conveyor C is prevented. The conveying surface C1 is an example of the "conveyor surface" of the present disclosure.

[0054] Furthermore, the rotor core 2 is housed inside the heating furnace 20 while being placed on the tray member 10. The rotor core 2 is then preheated inside the heating furnace 20. In this case, a gap is formed between the plate portion 12 and the furnace bottom of the heating furnace 20 via the first protrusion 14. In other words, contact between the lower surface of the plate portion 12 and the furnace bottom is prevented.

[0055] The preheated rotor core 2 is held in the molding apparatus 30 in a position where it is placed on the tray member 10. Specifically, the upper mold 31 abuts against the upper surface of the rotor core 2 placed on the tray member 10, and the lower mold 32 abuts against the lower surface of the tray member 10. In this case, the tray member 10 is positioned relative to the lower mold 32 by means of the first protrusion 14. Then, the rotor core 2 held in the molding apparatus 30 is inserted into the magnet insertion hole 4 (see reference 4). Figure 2 Molding with filled resin.

[0056] It should be noted that, in this embodiment, rotor core 2 is shown as an example of a motor core, but this disclosure is not limited to this. Specifically, the tray member 10 described in this embodiment can also be used, for example, to resin mold the portion of the stator core (which serves as a motor core) with wound coils, or to fill the axially provided through holes of an unfastened laminated core with resin to fix the laminated cores together. It should also be noted that the motor in this specification also includes a semi-finished product state in which certain components are assembled to a motor core (rotor core, stator core).

[0057] <Structure of rotor core and tray components>

[0058] Next, refer to Figure 2 The general structure of the rotor core 2 and the tray component 10 in this embodiment will be described. Figure 2 This is a perspective view showing the schematic structure of the rotor core 2 and the tray member 10 in this embodiment.

[0059] like Figure 2 As shown, the rotor core 2 is formed by stacking multiple thin electromagnetic steel plates. The rotor core 2 is cylindrical, and a through hole 5 is provided in the central portion of the rotor core 2 (i.e., the region containing the cylindrical central axis). When the rotor core 2 is assembled into a motor, a shaft constituting the rotating shaft is inserted into the through hole 5. Furthermore, in the rotor core 2, a plurality of (…) extending along the axial direction of the rotor core 2 are arranged circumferentially around the through hole 5. Figure 2 There are four magnet insertion holes 4. These magnet insertion holes 4 can be in a shape into which a permanent magnet 3 can be inserted, such as a cuboid or arc-shaped through hole penetrating the thickness direction of the rotor core 2; their specific shape is not particularly limited. Similarly, the number of magnet insertion holes 4 can be arbitrarily changed, and can be set to be more than... Figure 2 The four shown are, for example, about 10 to 40. The magnet insertion hole 4 is an example of the "resin-filled portion" of the present disclosure. The through hole 5 is an example of the "central through hole" of the present disclosure.

[0060] The magnet insertion hole 4 of the rotor core 2 is a hole for inserting and fixing a permanent magnet 3 inside. The permanent magnet 3 can be, for example, a cuboid or a block shaped like a circular arc when viewed from above, slightly smaller than the magnet insertion hole 4. Furthermore, it is acceptable whether the permanent magnet 3 is magnetized at the point of insertion into the magnet insertion hole 4. Also, it is acceptable whether the permanent magnet 3 is divided in the stacking direction or in a direction orthogonal to the stacking direction. When the permanent magnet 3 is inserted into the magnet insertion hole 4, at least partially, a gap is formed between the outer peripheral surface of the permanent magnet 3 and the inner peripheral surface of the magnet insertion hole 4. The gap formed in the magnet insertion hole 4 functions as a space for resin filling. These multiple spaces communicate with the first through hole 16 provided in the plate portion 12 of the tray member 10.

[0061] In this embodiment, the magnet insertion hole 4 of the rotor core 2 is exemplified as a cuboid-shaped hole that is open in the vertical direction and substantially has no gaps in the front-back and left-right directions. Therefore, the upper mold 31 and the lower mold 32 are molds with generally flat abutment surfaces, but the shape of the abutment surfaces of the upper mold 31 and the lower mold 32 can be appropriately modified to match the shape of the rotor core 2 to be held. For example, when the molding apparatus 30 of this embodiment is used for resin molding of an inner rotor type stator core, it is preferable that the upper mold 31 and the lower mold 32 are molds that include protrusions to be inserted into the space formed in the center of the stator core.

[0062] exist Figure 2 In the example shown, the tray member 10 has a circular plate-shaped plate portion 12. The rotor core 2 is placed on the upper surface 12A of the plate portion 12. The rotor core 2 is placed on the plate portion 12 with the central axis of the circular plate-shaped plate portion 12 substantially aligned with the central axis of the rotor core 2. Furthermore, the plate portion 12 has a shape capable of supporting the rotor core 2 (e.g., an outer diameter larger than the outer diameter of the rotor core 2 and a plate thickness that provides sufficient rigidity to support the rotor core 2). The plate portion 12 is an example of a "plate portion" in the present disclosure, and the upper surface 12A is an example of a "first surface" in the present disclosure.

[0063] Furthermore, the tray member 10 has a first protrusion 14 protruding from a surface (here, the lower surface 12B) opposite to the surface on which the rotor core 2 is mounted (here, the upper surface 12A, also referred to hereinafter simply as the "mounting surface"). The first protrusion 14 is, for example, a cylindrical pin-shaped member with its base end fitted to the plate portion 12. The diameter of the pin-shaped member 14A decreases towards the front end. The lower surface 12B is an example of the "second surface" of the technology disclosed herein.

[0064] Furthermore, a plurality of pin-shaped members 14A are provided along the outer edge of the plate portion 12. Here, the pin-shaped members 14A are provided on the outer peripheral side of the plate portion 12. Specifically, the pin-shaped members 14A are provided in the plate portion 12 at a position on the outer peripheral side beyond the first through hole 16. The first protrusion 14 is an example of the "first protrusion" of the present disclosure, and the pin-shaped members 14A are an example of the "pin-shaped members" of the present disclosure.

[0065] Here, an example of a cylindrical pin member 14A is shown, but this is merely an example. For instance, the pin member 14A could also be a polygonal prism (e.g., a quadrangular prism). Furthermore, the front end of the pin member 14A could be conical rather than hemispherical. The pin member 14A can be integrally formed with the plate portion 12 or provided as a separate component.

[0066] Regarding the number and arrangement of the first protrusions 14, there are no particular limitations as long as the arrangement can support the weight of the rotor core 2 and ensure the stability of the tray member 10. For example, four first protrusions 14 can be arranged at equal intervals along the outer periphery of the plate portion 12.

[0067] A first through hole 16 extending through the thickness direction is formed in the plate portion 12. The first through hole 16 is formed at a position opposite to the magnet insertion hole 4 of the rotor core 2. That is, as described above, the first through hole 16 communicates with the magnet insertion hole 4. The number and arrangement of the first through holes 16 are determined according to the number and arrangement of the magnet insertion holes 4 in the rotor core 2. The first through hole 16 is an example of the "first through hole" of the technology of this disclosure.

[0068] Furthermore, the tray member 10 has a second protrusion 18 protruding from the surface on which the rotor core 2 is mounted (here, the upper surface 12A). The second protrusion 18 is configured to be inserted into a hole 6 formed in the rotor core 2. By inserting the second protrusion 18 into the hole 6, the rotor core 2 is positioned relative to the tray member 10. In addition, by engaging the second protrusion 18 with the hole 6, it is possible to prevent the rotor core 2 from falling off the mounting surface of the tray member 10.

[0069] exist Figure 2 In the example shown, four second protrusions 18 are arranged circumferentially along the rotor core 2. The number and arrangement of the second protrusions 18 are determined based on the number and arrangement of the holes 6. Furthermore, the protruding length of the second protrusions 18 (i.e., the height from the mounting surface to the front end) is appropriately set according to positioning accuracy, etc. The second protrusions 18 are an example of the "second protrusions" of the technology of this disclosure.

[0070] The hole 6 formed in the rotor core 2 is, for example, a through hole provided in the rotor core 2 for weight reduction. Furthermore, the hole 6 can also be a through hole serving as a flow path for cooling the motor core when the rotor core 2 is used as part of the motor core. Additionally, the hole 6 can be a dedicated hole for the insertion of the second protrusion 18. In this case, the hole 6 may not be a through hole. The hole 6 is an example of a "hole formed in the core" according to the technology of this disclosure.

[0071] exist Figure 2 The example shown illustrates a second protrusion 18 as a cylindrical pin-shaped member, but this is merely one example. For instance, the second protrusion 18 could also be a polygonal prism (e.g., a quadrangular prism), or a hemispherical or conical protrusion. Furthermore, the second protrusion 18 can be integrally formed with the plate portion 12 or provided as a separate component.

[0072] Next, refer to Figure 3 The preheating of the rotor core 2 in this embodiment will be described. Figure 3 This is a schematic diagram illustrating an example of the preheating of the rotor core 2 in this embodiment. (See diagram below.) Figure 3 As shown, the rotor core 2 is housed inside the heating furnace 20, mounted on a tray member 10. In other words, the tray member 10 is designed for use in the heating process of the rotor core 2 (in this case, a preheating process before the molding process). The heating furnace 20 is a heating device capable of preheating the rotor core 2 before molding. Figure 3 In the example shown, the heating furnace 20 is a hot air circulating furnace. Specifically, ambient gas heated by a heat source (not shown) is introduced into the furnace, and the ambient gas inside the furnace is circulated by a fan 24 located at the top 22 of the furnace. The preheating temperature of the rotor core 2 can be set, for example, to about 100°C to 200°C.

[0073] The tray component 10, which carries the rotor core 2, is positioned inside the furnace via a first protrusion 14. Figure 3 In the example shown, the first protrusion 14 of the tray member 10 abuts against the furnace bottom 26. In other words, during the preheating process of the rotor core 2, the tray member 10 is supported by the furnace bottom 26. As a result, a gap t is formed between the furnace bottom 26 and the plate portion 12, corresponding to the height of the first protrusion 14. That is, the tray member 10 is disposed in the furnace such that the lower surface 12B of the plate portion 12 does not contact the furnace bottom 26. Thus, heat conduction from the plate portion 12 to the furnace wall (here, the furnace bottom 26) is suppressed. In this structure, the furnace bottom 26 is an example of the "support surface" of the technology of this disclosure.

[0074] For example, consider the case where the lower surface 12B of the plate portion 12 is in direct contact with the furnace bottom 26. In this case, heat conduction occurs through the contact interface between the lower surface 12B of the plate portion 12 and the furnace bottom 26, and heat moves from the plate portion 12 to the furnace bottom 26. Therefore, the temperature of the plate portion 12 and the rotor core 2 mounted on the plate portion 12 may sometimes be difficult to rise. In this structure, since a gap t is formed between the plate portion 12 and the furnace bottom 26 through the first protrusion 14, heat conduction caused by the contact between the lower surface 12B of the plate portion 12 and the furnace bottom 26 is suppressed.

[0075] Here, an example is given in which the tray member 10 is supported by the furnace bottom 26 in the heating furnace 20, but this is only one example. The tray member 10 may also be supported by a support frame provided within the heating furnace 20. Furthermore, an example is given here in which one rotor core 2 is heated within the heating furnace 20, but this is only one example. For example, multiple rotor cores 2 may be heated simultaneously within the heating furnace 20, which is divided into multiple furnace chambers.

[0076] The protrusion height of the pin-shaped member 14A should be such that the gap t is high enough to allow unobstructed airflow of the heating environment gas within the furnace 20. For example, the protrusion height of the pin-shaped member 14A should be about 1 mm, and it should be at least 0.25 mm.

[0077] Furthermore, airflow of heating ambient gas may sometimes be generated within the furnace. For example, in the case of a hot blast circulating furnace 20, airflow of heating ambient gas is generated within the furnace by a fan 24. Moreover, even in furnaces using heating methods other than hot blast circulating furnaces, airflow of heating ambient gas is generated through convection due to localized temperature differences within the furnace. This airflow of heating ambient gas passes through the magnet insertion hole 4 and the first through hole 16 of the rotor core 2. Then, the airflow of heating ambient gas passes through the gap t between the plate portion 12 and the furnace bottom 26. Thus, the airflow of heating ambient gas is less likely to be obstructed around the rotor core 2 and the tray member 10.

[0078] Next, refer to Figure 4 The molding of the rotor core 2 in this embodiment will be described. Figure 4 This is a schematic diagram illustrating an example of the molding of the rotor core 2 in this embodiment.

[0079] like Figure 4 As shown, the rotor core 2 is held by the molding apparatus 30 in a state where it is placed on the tray member 10. In other words, the tray member 10 is also configured to be used for a filling process of filling resin into the magnet insertion hole 4. The molding apparatus 30 is configured to include an upper mold 31, a lower mold 32, and a support column 33. The upper mold 31 is supported in a manner that abuts against the upper part of the rotor core 2, specifically against the upper surface of the rotor core 2. Furthermore, the lower mold 32 is supported in a manner that abuts against the lower part of the rotor core 2, specifically against the lower surface of the rotor core 2. The support column 33 is a columnar member erected between the upper mold 31 and the lower mold 32. It is possible that the support column 33 can be used with an actuator (not shown) to move the upper mold 31 up and down in the vertical direction. The lifting and lowering action of the upper mold 31 can be performed mainly when the rotor core 2 is held in the molding apparatus 30, or when the rotor core 2 is unloaded from the molding apparatus 30 and removed.

[0080] The upper mold 31 can move vertically as described above. Furthermore, by lowering the upper mold 31 and pressing the upper surface of the rotor core 2 with a predetermined pressing force while the rotor core 2 is placed on the lower mold 32 via the tray member 10, the rotor core 2 can be held in a manner that clamps it between the upper mold 31 and the lower mold 32. The shape and material of the surfaces of the upper mold 31 and the lower mold 32 that abut against the rotor core 2 can be adjusted so that the resin filling the magnet insertion hole 4 does not leak out of the rotor core 2. Specifically, the contact surfaces can be adjusted to be in a sealed state when the rotor core 2 is clamped by the upper mold 31 and the lower mold 32.

[0081] In this embodiment, the structure described above that directly moves the upper mold 31 up and down is used. However, any structure that can relatively change the vertical positions of the upper mold 31 and the lower mold 32 can be used. Specifically, for example, the structure that moves the lower mold 32 in the vertical direction can be used instead of the structure that moves the upper mold 31 in the vertical direction, or the structure that moves both the upper mold 31 and the lower mold 32 in the vertical direction can be used.

[0082] A resin filling path 35 is formed between the lower mold 32 and the plate portion 12 for supplying softened resin R to the plurality of magnet insertion holes 4 of the rotor core 2. That is, when filling the magnet insertion holes 4 with resin, the tray member 10 also functions as a gate member. The path structure of the resin filling path 35 is appropriately set to match the number, shape, and shape of the magnet insertion holes 4 of the rotor core 2. In addition, a positioning hole 32A is formed on the outer periphery of the lower mold 32 along the thickness direction. The positioning hole 32A is provided at a position corresponding to the first protrusion 14 of the tray member 10. When the tray member 10 is placed on the lower mold 32, the first protrusion 14 is inserted into the positioning hole 32A. Thus, the tray member 10 is positioned relative to the lower mold 32. The positioning hole 32A is an example of the "positioning hole" of the present disclosure.

[0083] A pin-shaped member 32B is provided in the lower mold 32. The pin-shaped member 32B is configured to be able to move up and down relative to the lower mold 32. The rising pin-shaped member 32B abuts against the lower surface of the plate portion 12. Furthermore, by being pushed upward by the pin-shaped member 32B, the plate portion 12 and the rotor core 2 are disassembled from the lower mold 32. In addition, a spacer member 32C is arranged between the plate portion 12 and the lower mold 32. The spacer member 32C is a plate-shaped member that can form a gap between the plate portion 12 and the lower mold 32. The shape and arrangement of the spacer member 32C are not particularly limited. For example, it can be an annular member arranged outside the first protrusion 14, or it can be an annular member along the circumference of the plate portion 12. Alternatively, the portion protruding from the lower mold 32 can be used to form a gap between the plate portion 12 and the lower mold 32 instead of the spacer member 32C.

[0084] The rotor core 2, which is used to fill the magnet insertion hole 4 with resin, may often be changed to a rotor core of a different shape. Therefore, regarding the lower mold 32, it is advisable to prepare multiple lower molds with different resin filling channels 35 and appropriately replace them to match the rotor core 2 to be held in the upper mold 31 and the lower mold 32. In addition, the lower mold 32 may also include a lifter that allows the lower mold 32 to be raised and lowered for feeding tablets into the pot and cleaning the resin filling channels 35.

[0085] The molding apparatus 30 also includes a plunger 34. The plunger 34 presses against the resin R, which has been softened by heating with a heater (not shown). Figure 4 In the example shown, resin R is pressed against the center of plate portion 12 via a cylindrical plunger 34 located at the center of lower mold 32. The softened resin R flows through resin filling path 35 and then fills the magnet insertion hole 4 of rotor core 2 via first through hole 16. Resin R primarily comprises thermosetting resin material. Specifically, resin R can be a resin primarily comprising thermosetting resin material, such as epoxy resin, phenolic resin, unsaturated polyester resin, or cyanate ester resin. Furthermore, in addition to thermosetting resin material, curing agents, fillers, etc., can be added to resin R.

[0086] <Motor Manufacturing Method>

[0087] Next, refer to Figure 5 The manufacturing method of the motor according to this embodiment will be described. Figure 5 This is a flowchart illustrating an example of the rotor core manufacturing process of this embodiment.

[0088] In the rotor core manufacturing method of this embodiment, firstly, as follows: Figure 5 The rotor core 2 is placed on the tray member 10 (step S01). Specifically, the rotor core 2 is placed on the upper surface of the plate portion 12 of the tray member 10. In this case, the second protrusion 18 of the plate portion 12 is inserted into the hole 6 formed in the rotor core 2, thereby positioning the rotor core 2 relative to the tray member 10.

[0089] Next, a permanent magnet 3 and a rotor core 2 to which the permanent magnet 3 is assembled are prepared, and the permanent magnet 3 is inserted into the magnet insertion hole 4 of the rotor core 2 (step S02). Then, the rotor core 2 is conveyed to the preheating process using the tray member 10 (step S03). The rotor core 2, which has been conveyed to the preheating process, is preheated (step S04). The preheating of the rotor core 2 uses... Figure 3The heating furnace 20 shown is used for heating. That is, the rotor core 2, which is placed on the tray member 10, is heated in the heating furnace 20. Alternatively, the upper mold 31 and the lower mold 32 can be preheated separately from the rotor core 2 using a mold heater (not shown).

[0090] The preheated rotor core 2 is conveyed to the molding process while placed on the tray member 10. Then, the rotor core 2 is placed on the lower mold 32 via the tray member 10, and the upper mold 31 is moved downward, thereby holding the rotor core 2 within the upper mold 31 and the lower mold 32 (i.e., the mold) (process S05). At this time, the upper mold 31 is adjusted to press the upper surface of the rotor core 2 with a specified pressure, thereby ensuring that the upper mold 31 and the upper surface of the rotor core 2, and the lower mold 32 and the lower surface of the tray member 10, are in close contact.

[0091] When a sheet is inserted into the lower mold 32, a heater (not shown) is activated to soften the resin R (step S06). Specifically, heating within the barrel of the molding apparatus 30 reduces the viscosity of the resin forming the sheet (resin cured into a predetermined shape), resulting in softened resin (hereinafter referred to as "softened resin") R. Preferably, the heater used for this heating is controlled in a manner that prevents localized temperature differences from forming on the sheet. Through this heating, the sheet melts and its viscosity decreases, transforming into the highly fluid softened resin R.

[0092] When the flake material changes to softened resin R, then, as Figure 4 The softened resin R is filled into the magnet insertion hole 4 via the plunger 34 (step S07). Specifically, the resin R is pressed by moving the plunger 34 upward, injecting the softened resin R into the resin filling path 35. Then, the softened resin R flowing through the resin filling path 35 fills the magnet insertion hole 4 of the rotor core 2. It should be noted that, in order to smoothly perform the filling of the magnet insertion hole 4 with the softened resin R in step S07, for example, an air hole (not shown) can be provided at an appropriate position on the upper mold 31 to expel air from the magnet insertion hole 4.

[0093] When the softened resin R has been filled into the magnet insertion hole 4, the mold heater (not shown) is activated to cure the softened resin R inside the magnet insertion hole 4 (step S08). When curing the softened resin R, it is preferable to heat it at, for example, 100°C to 180°C for a few minutes. The softened resin R is cured by this heating, thereby fixing the permanent magnet 3 to the magnet insertion hole 4 of the rotor core 2 through resin molding. It should be noted that the heating time in step S08 can be appropriately adjusted to match the specific composition of the resin used in the sheet.

[0094] When the aforementioned series of resin molding processes are completed, the upper mold 31 is raised, and a conveying component (not shown) such as a robotic arm is used to remove the resin-molded rotor core 2 from the device (step S09). The removed rotor core 2 can be transferred to another device, for example, for shaft assembly. Then, when the removal of the rotor core 2 is complete, the molding apparatus 30 is cleaned (step S10). Cleaning the molding apparatus 30 includes removing the resin that has cured within the resin filling path 35. In addition, it may also include cleaning the surfaces of the upper mold 31 and lower mold 32, the inside of the barrel, etc., using cleaning components such as brushes.

[0095] As explained above, the tray member 10 of this first embodiment is provided with a plate portion 12 and a first protrusion 14. The rotor core 2 is placed on the upper surface 12A of the plate portion 12. Furthermore, the first protrusion 14 protrudes from the lower surface 12B of the plate portion 12. When the rotor core 2, placed on the plate portion 12, is heated, the first protrusion 14 suppresses heat conduction from the tray member 10 to the furnace bottom 26 of the heating furnace 20. Specifically, the first protrusion 14 creates a gap t between the plate portion 12 and the furnace bottom 26, thus suppressing heat conduction from the tray member 10. This facilitates homogenization of the rotor core 2, thereby shortening the heating time. As a result, it contributes to increased productivity in the rotor manufacturing process.

[0096] Furthermore, in the tray member 10 of this first embodiment, a first through hole 16 is provided in the plate portion 12 at a position opposite to the magnet insertion hole 4 of the rotor core 2. Because of the first through hole 16, the airflow of the heating environment gas inside the magnet insertion hole 4 is unobstructed, thus easily homogenizing the heating environment gas. As a result, the heating state of the rotor core 2 around the magnet insertion hole 4 is easily homogenized, which helps to improve the productivity of the rotor manufacturing process.

[0097] Furthermore, for example, when filling resin into the magnet insertion hole 4 after the preheating process, if the heating around the magnet insertion hole 4 is insufficient, the resin will cool down and its fluidity will decrease. As a result, the resin may not fill the interior of the magnet insertion hole 4 completely. In this structure, the airflow of the heating environment gas is unobstructed through the first through hole 16, and the heating around the magnet insertion hole 4 is sufficient, thus facilitating the filling of preheated resin.

[0098] Furthermore, the tray member 10 of this first embodiment is also configured to be used in the molding process of filling the magnet insertion hole 4 of the rotor core 2 with resin R, by filling the magnet insertion hole 4 with resin R through the first through hole 16 provided in the tray member 10. Since the first through hole 16 is also used for filling resin R, the structure of the tray member 10 is simplified compared to the case where a separate through hole for resin filling is provided in the tray member 10.

[0099] Furthermore, the tray member 10 of this first embodiment is also designed to be used in a molding process, and the first protrusion 14 provided on the tray member 10 is configured to be inserted into a positioning hole 32A in the lower mold 32 filled with resin R. Since the first protrusion 14 is used for positioning, the structure of the tray member 10 is simplified compared to the case where a positioning protrusion is additionally provided on the tray member 10.

[0100] Furthermore, in the tray member 10 of this first embodiment, a second protrusion 18 protruding from the upper surface 12A is provided on the plate portion 12. The second protrusion 18 is inserted into the hole 6 formed in the rotor core 2. The rotor core 2 is positioned relative to the plate portion 12 via the second protrusion 18.

[0101] Furthermore, in the tray member 10 of this first embodiment, a plurality of second protrusions 18 are provided along the circumference of the rotor core 2. Since the second protrusions 18 formed along the circumference are inserted into the holes 6, the rotor core 2 is positioned relative to the plate portion 12 with higher precision. In addition, compared with the case where a cylindrical protrusion is provided in the center of the plate portion 12 and the protrusion is inserted into the through hole 5 of the rotor core 2 for positioning, the airflow of the heating environment gas in the through hole 5 is less obstructed, so it is easier to heat the area around the through hole 5 of the rotor core 2.

[0102] Furthermore, in the tray member 10 of this first embodiment, the first protrusion 14 is provided with a plurality of pin-shaped members 14A along the outer edge of the plate portion 12. Since the first protrusion 14 is a pin-shaped member 14A, compared to the case where the first protrusion 14 is a block-shaped protrusion, the contact portion of the first protrusion 14 is reduced, and heat conduction is suppressed. Furthermore, since it is supported by a plurality of pin-shaped members 14A provided along the periphery, the tray member 10 has stable posture.

[0103] Furthermore, the pallet member 10 of this first embodiment is also configured to be used in the conveying process of the rotor core 2, and the first protrusion 14 is configured to form a gap between the plate portion 12 and the conveying surface C1. Since the gap is formed between the first protrusion 14 and the conveying surface C1, it is possible to suppress the adhesion of contaminants (e.g., waste materials) or the formation of scratches on the lower surface 12B of the plate portion 12 of the pallet member 10.

[0104] For example, when the tray member 10 is also used in the resin filling process, the tray member 10 sometimes forms part of the resin filling path 35. In this case, when contaminants adhere to the tray member 10, the contaminants may mix into the resin R, or the contaminants may form gaps between the tray member 10 and the mold, resulting in resin R leakage. Furthermore, when the tray member 10 is damaged, the pressure applied to the resin R will be concentrated at the damaged area, increasing the likelihood of resin R leakage. In this structure, by suppressing contact with the conveying surface C1 through the first protrusion 14, the problems during resin R filling described above can be suppressed.

[0105] (First variation)

[0106] In the first embodiment described above, an example of a pin-shaped member 14A being used as the first protrusion 14 was given for illustration, but the technology disclosed herein is not limited to this. In this first variation, a stepped portion 14B is provided as the first protrusion 14. Figure 6 As shown, a stepped portion 14B is provided on the pallet member 10 along the periphery of the plate portion 12. The stepped portion 14B extends from the lower surface 12B of the plate portion 12 (see reference). Figure 3 The step 14B is a locally protruding step. The height of the step 14B should be such that a gap t is formed that allows unobstructed airflow of the heating environment gas in the heating furnace 20. The step 14B can be formed continuously along the circumference of the plate 12 or locally along the circumference of the plate 12.

[0107] In this first modification, a gap t is formed between the plate portion 12 and the furnace bottom 26 via the stepped portion 14B, suppressing heat conduction from the tray member 10. This facilitates homogenization of the rotor core 2, thus shortening the heating time of the rotor core 2. Consequently, this contributes to increased productivity in the rotor manufacturing process.

[0108] (Second variation)

[0109] In the first embodiment described above, an example of a pin-shaped member 14A being used for the first protrusion 14 was given, but the technology disclosed herein is not limited to this. In this second variation, a columnar member 19 is provided as the first protrusion 14. Figure 7As shown, a columnar member 19 is provided in the center of the plate portion 12. The columnar member 19 is positioned corresponding to the through hole 5 of the rotor core 2. The columnar member 19 is, for example, a cylindrical member, but it can also be a polygonal prism member. The lower end of the columnar member 19 protrudes from the plate portion 12 of the tray member 10. The protruding length of the lower end of the columnar member 19 should be such that a gap t is formed that allows unobstructed airflow of the heating environment gas in the heating furnace 20. The upper end of the columnar member 19 is inserted into the through hole 5 of the rotor core 2. Thus, the rotor core 2 is positioned relative to the tray member 10. In this case, the second protrusion 18 may not be provided in the tray member 10. The columnar member 19 is an example of a "columnar member" of the technology disclosed herein.

[0110] In this second modification, a gap t is formed between the plate portion 12 and the furnace bottom 26 by the columnar member 19, suppressing heat conduction from the tray member 10. This facilitates homogenization of the rotor core 2, thus shortening the heating time of the rotor core 2. As a result, it contributes to increased productivity in the rotor manufacturing process.

[0111] Furthermore, in this second modification, by placing the columnar member 19 in the central portion, the airflow of the heating environment gas toward the outer periphery of the tray member 10 is unobstructed, thus improving heating efficiency. Additionally, since the central portion of the tray member 10 is supported, the posture of the tray member 10 is stable.

[0112] (Third variation)

[0113] In the first embodiment described above, an example was given in which the plate portion 12 of the tray member 10 is in the shape of a circular plate, but the technology disclosed herein is not limited thereto. In this third variation, a second through hole 13 is provided in the central portion of the plate portion 12.

[0114] like Figure 8 As shown, a second through hole 13 is formed in the center of the plate portion 12. The second through hole 13 is formed in the plate portion 12 at a position corresponding to the through hole 5 of the rotor core 2. The diameter of the second through hole 13 is appropriately set based on the area of ​​the required mounting surface of the plate portion 12 and the strength of the plate portion 12, etc. The second through hole 13 is an example of the "second through hole" of the present disclosure.

[0115] As described above, a flow of heating ambient gas may sometimes be generated inside the furnace. This flow of heating ambient gas passes through the through hole 5 and the second through hole 13 of the rotor core 2. Then, the flow of heating ambient gas passes through the gap t between the plate portion 12 and the furnace bottom 26. Thus, the flow of heating ambient gas is not easily obstructed around the rotor core 2 and the tray member 10.

[0116] In this third variation, a second through hole 13 is provided in the plate portion 12 of the tray member 10. Through the second through hole 13, the airflow of the heating environment gas in the central space of the rotor core 2 is less likely to be obstructed. Therefore, the airflow of the heating environment gas inside the through hole 5 is unobstructed, thus facilitating the homogenization of the heating environment gas. As a result, the heating state of the rotor core 2 around the through hole 5 is easily homogenized, which helps to improve the productivity of the rotor manufacturing process.

[0117] (Fourth variation)

[0118] In the first embodiment described above, an example in which a second protrusion 18 is provided on the tray member 10 was given, but the technology disclosed herein is not limited thereto. In this fourth variation, a third protrusion 13A is formed on the tray member 10, which is provided along the periphery of the second through hole 13.

[0119] like Figure 9 As shown, in the tray member 10, a third protrusion 13A is formed in the plate portion 12. The third protrusion 13A is provided along the periphery of the second through hole 13 and extends towards the upper surface 12A of the plate portion 12 (see reference). Figure 2 The third protrusion 13A is inserted into the through hole 5 of the rotor core 2. The protrusion height and radial thickness of the third protrusion 13A are appropriately set. It should be noted that, here, an example is shown in which the third protrusion 13A is formed around the entire circumference of the second through hole 13, but this is only one example, and the third protrusion 13A may also be formed partially around the entire circumference of the second through hole 13. That is, when the plate portion 12 is viewed from above, the third protrusion 13A may appear as multiple arcs. The third protrusion 13A is an example of the "third protrusion" of the technology of this disclosure.

[0120] In this case, the second protrusion 18 may not be provided on the tray member 10, and the phase alignment of the rotor core 2 (i.e., the circumferential alignment of the rotor core 2) can be achieved by engaging the key (not shown) provided on the rotor core 2 with the notch (not shown) provided on the tray member 10.

[0121] In this fourth modification, a third protrusion 13A is formed on the tray member 10 around the second through hole 13. The third protrusion 13A is inserted into the through hole 5 of the rotor core 2. Thus, the rotor core 2 is positioned relative to the tray member 10.

[0122] <<Second Implementation>>

[0123] In the first embodiment described above, an example of filling one rotor core 2 with resin R during the molding process was given, but the technology disclosed herein is not limited to this. In this second embodiment, multiple rotor cores 2 are filled with resin R during the molding process. It should be noted that in this embodiment, descriptions of structures common to those described in the first embodiment are sometimes omitted.

[0124] Figure 10 This is a schematic diagram illustrating an example of the preheating of the rotor core 2 in this embodiment. Figure 11 This is a schematic diagram illustrating an example of the molding process performed on the rotor core 2 in this embodiment. (See diagram below.) Figure 10 As shown, the rotor core 2 is disposed within the heating furnace 20, mounted on a tray member 10A. The tray member 10A has a first protrusion 14. Figure 10 In the example shown, the first protrusion 14 is a pin-shaped member 14A. The first protrusion 14 is located on the opposite side of the second protrusion 18, separated from the plate portion 12. In other words, the first protrusion 14 is located on the lower surface 12B of the plate portion 12 (see reference). Figure 3 The second protrusion 18 is located in the plate portion 12 at a position corresponding to the second protrusion 18. The second protrusion 18 is located in the plate portion 12 at a position on the inner periphery side of the first through hole 16. Therefore, the first protrusion 14 is also located in the plate portion 12 at a position on the inner periphery side of the first through hole 16.

[0125] Furthermore, in the tray component 10A, a second through hole 13 is provided in the center of the plate portion 12. The airflow of the heating ambient gas passes through the through hole 5 and the second through hole 13 of the rotor core 2. In addition, the airflow of the heating ambient gas passes through the magnet insertion hole 4 and the first through hole 16 of the rotor core 2. Then, the airflow of the heating ambient gas passes through the gap t between the plate portion 12 and the furnace bottom 26.

[0126] like Figure 11 As shown, the rotor core 2 is held by the molding apparatus 30 in a state where it is placed on the tray member 10A. Multiple rotor cores 2 are arranged in the molding apparatus 30. The multiple rotor cores 2 are arranged in a state where they are aligned along the axial direction of the rotor core 2 (that is, the direction of the central axis of the cylindrical rotor core 2). That is, the multiple rotor cores 2 are arranged in multiple layers. Each of the multiple rotor cores 2 is preheated individually by a heating furnace 20. For example, multiple heating furnaces 20 can be prepared, and the multiple rotor cores 2 can be preheated separately by the multiple heating furnaces 20.

[0127] exist Figure 11In the example shown, the upper and middle rotor cores 2 of the three rotor cores 2 are respectively arranged in the molding apparatus 30 in a state of being placed on the tray member 10A. Moreover, the lowermost rotor core 2 is arranged in the molding apparatus 30 in a state of being placed on the tray member 10.

[0128] When multiple rotor cores 2 are arranged axially, the first protrusion 14 of the tray member 10A, which holds the upper layer of rotor cores 2, is inserted into the hole 6 of the lower layer of rotor cores 2. Figure 11 In the example shown, the first protrusion 14 of the tray member 10A, on which the upper rotor core 2 is placed, is inserted into the hole 6 of the middle rotor core 2. Furthermore, the first protrusion 14 of the tray member 10A, on which the middle rotor core 2 is placed, is inserted into the hole 6 of the lower rotor core 2. The upper rotor core 2 is an example of the "first core" of the present disclosure, and the middle rotor core 2 is an example of the "second core" of the present disclosure.

[0129] By inserting the first protrusion 14 into the hole 6 of the middle rotor core 2, the first protrusion 14 engages with the hole 6, and the tray member 10A carrying the upper rotor core 2 and the middle rotor core 2 are positioned. Furthermore, the tray member 10A carrying the middle rotor core 2 and the lower rotor core 2 are also positioned in the same way. That is, the multiple rotor cores 2 arranged axially are positioned relative to each other. Here, the protrusion height of the first protrusion 14 is set to be greater than or equal to the thickness of the stacked electromagnetic steel plates constituting the lower rotor core 2. Thus, the first protrusion 14 can engage with the rotor core 2.

[0130] Furthermore, when multiple rotor cores 2 are arranged axially, the magnet insertion holes 4 of each rotor core 2 are connected via a first through hole 16 of the tray member 10A. In other words, the first through hole 16 of the tray member 10A, on which the upper layer of rotor core 2 is placed, is located at a position corresponding to the magnet insertion hole 4 of the lower layer of rotor core 2. Figure 11 In the example shown, the magnet insertion holes 4 of the upper, middle and lower rotor cores 2 are connected via the first through hole 16 of the tray member 10A.

[0131] In the molding apparatus 30, a plunger 34 presses down on the resin R, which has been softened by heating. This causes the softened resin R to flow and fill the magnet insertion holes 4 of the rotor core 2 via the resin filling path 35. The flowing resin R first enters the magnet insertion holes 4 of the lower rotor core 2, then the magnet insertion holes 4 of the middle rotor core 2, and finally the magnet insertion holes 4 of the upper rotor core 2. In this way, the magnet insertion holes 4 of each of the multiple rotor cores 2 are filled with resin R.

[0132] Next, refer to Figure 12 The manufacturing method of the motor according to this embodiment will be described. Figure 12 This is a flowchart illustrating an example of the rotor core manufacturing process of this embodiment. Steps S11 to S14 and S18 to S20 are the same as steps S01 to S04 and S08 to S10 in the rotor core manufacturing process of the first embodiment, and therefore are omitted from the description.

[0133] The preheated rotor core 2 is conveyed to the molding process in a state where it is placed on the tray member 10A. In the molding apparatus 30, multiple rotor cores 2 are arranged in a state of being aligned along the axial direction. Then, the rotor core 2 is placed on the lower mold 32 via the tray member 10, and then the upper mold 31 is moved downward, thereby holding the rotor core 2 within the upper mold 31 and the lower mold 32 (i.e., the mold) (step S15). At this time, the upper mold 31 is adjusted to press the upper surface of the uppermost rotor core 2 with a specified pressure, thereby ensuring that the upper mold 31 is in close contact with the upper surface of the uppermost rotor core 2 and the lower mold 32 is in close contact with the lower surface 12A of the tray member 10.

[0134] When a sheet is inserted into the lower mold 32, a heater (not shown) is activated to soften resin R (step S16). Once the sheet has changed to softened resin R, then... Figure 11 The softened resin R is filled into the magnet insertion hole 4 via the plunger 34 (step S17). Specifically, the resin R is pressed by moving the plunger 34 upward, injecting the softened resin R into the resin filling path 35. Then, the softened resin R flowing through the resin filling path 35 fills the magnet insertion hole 4 of each of the plurality of rotor cores 2 arranged along the axial direction.

[0135] As explained above, the tray member 10A of this second embodiment is used in the preheating process of the rotor core 2 and in the process of filling resin into the magnet insertion hole 4 while the plurality of rotor cores 2 are arranged axially. Furthermore, in the preheating process, a gap t is formed between the plate portion 12 and the furnace bottom 26 through the first protrusion 14, suppressing heat conduction from the tray member 10A. This facilitates homogenization of the rotor core 2, thus shortening the heating time of the rotor core 2. As a result, it contributes to increased productivity in the rotor manufacturing process.

[0136] Furthermore, in the molding process, multiple rotor cores 2 can be filled with resin R at once using a single molding device 30, which helps to improve productivity. For example, compared to using different molding devices 30 to fill multiple rotor cores 2 with resin R, the productivity in the rotor manufacturing process is improved.

[0137] Furthermore, in the tray member 10A of this second embodiment, when the rotor core 2 is disposed on the layer below the tray member 10A on which the rotor core 2 is placed, the first protrusion 14 is configured to be able to be inserted into the hole 6 formed in the rotor core 2 of the next layer. As a result, since the first protrusion 14 is inserted into the hole 6 of the rotor core 2 of the next layer, the axial arrangement of the plurality of rotor cores 2 is stabilized, and space saving is achieved in the axial direction.

[0138] Furthermore, in the tray member 10A of this second embodiment, the plate portion 12 has a second protrusion 18, which is inserted into a hole 6 formed in the rotor core 2 placed on the tray member 10A. Thus, the rotor core 2 is positioned relative to the plate portion 12 by means of the second protrusion 18.

[0139] Furthermore, in this second embodiment, the first protrusion 14 of the tray member 10A on which the upper rotor core 2 is placed is inserted into the hole 6 formed in the middle rotor core 2. Similarly, the second protrusion 18 of the tray member 10A on which the middle rotor core 2 is placed is inserted into the hole 6 formed in the middle rotor core 2. Thus, the holes 6 into which the first protrusion 14 and the second protrusion 18 are inserted can be shared in the middle rotor core 2, simplifying the construction of the rotor core 2 compared to having separate holes for inserting the first protrusion 14 and the second protrusion 18. Furthermore, because the holes 6 are shared, the positioned rotor core 2 is less likely to be arranged in a radially offset manner.

[0140] Furthermore, in the tray member 10A of this second embodiment, the second protrusion 18 is provided on the opposite side of the first protrusion 14, across the plate portion 12. Thus, the rotor core 2 is positioned relative to the plate portion 12 via the second protrusion 18. Moreover, since the second protrusion 18 is located on the opposite side of the first protrusion 14, even when the rotor core 2 is arranged in multiple layers, the upper and lower rotor cores 2 are positioned relative to each other, making it difficult to arrange them in a radially offset manner.

[0141] Furthermore, in the tray member 10A of this second embodiment, a first through hole 16 is provided in the plate portion 12 at a position opposite to the magnet insertion hole 4 of the rotor core 2. Because of the first through hole 16, the airflow of the heating environment gas inside the magnet insertion hole 4 is unobstructed, thus easily homogenizing the heating environment gas. As a result, the heating state of the rotor core 2 around the magnet insertion hole 4 is easily homogenized, which helps to improve the productivity of the rotor manufacturing process.

[0142] Furthermore, for example, when filling resin into the magnet insertion hole 4 after the preheating process, if the heating around the magnet insertion hole 4 is insufficient, the resin will cool down and its fluidity will decrease. As a result, the resin may not fill the interior of the magnet insertion hole 4 completely. In this structure, the airflow of the heating environment gas is unobstructed through the first through hole 16, and the heating around the magnet insertion hole 4 is sufficient, thus facilitating the filling of preheated resin.

[0143] Furthermore, for example, in the case where multiple rotor cores 2 are configured in a multi-layered manner during the molding process, the magnet insertion holes 4 of each of the multiple rotor cores 2 are connected via the first through hole 16. As a result, it becomes easier for the resin R to fill the magnet insertion holes 4.

[0144] Furthermore, the tray member 10A of this second embodiment is configured to also be used in the molding process of filling the magnet insertion hole 4 of the rotor core 2 with resin R, i.e., filling the magnet insertion hole 4 with resin R through the first through hole 16 provided in the tray member 10A. Since the first through hole 16 is also used for filling resin R, the structure of the tray member 10A is simplified compared to the case where a separate through hole for resin filling is provided in the tray member 10A.

[0145] Furthermore, in the tray member 10A of this second embodiment, a second through hole 13 is provided in the plate portion 12. Through the second through hole 13, the airflow of the heating environment gas in the central space of the rotor core 2 is not easily obstructed. Therefore, the airflow of the heating environment gas inside the through hole 5 is unobstructed, thus facilitating the homogenization of the heating environment gas. As a result, the heating state of the rotor core 2 around the through hole 5 is easily homogenized, which helps to improve the productivity of the rotor manufacturing process.

[0146] Furthermore, the tray member 10 of this second embodiment is also designed to be used in a molding process, and the first protrusion 14 provided on the tray member 10 is configured to be inserted into a positioning hole 32A in the lower mold 32 filled with resin R. Since the first protrusion 14 is used for positioning, the structure of the tray member 10 is simplified compared to the case where a positioning protrusion is additionally provided on the tray member 10.

[0147] It should be noted that, in the second embodiment described above, an example of three rotor cores 2 arranged along the axial direction was given for illustration, but the technology disclosed herein is not limited to this. For example, two rotor cores 2 may also be arranged along the axial direction, or four or more rotor cores 2 may be arranged along the axial direction.

[0148] Furthermore, in the second embodiment described above, the third protrusion 13A shown in the fourth variation can also be applied to the pallet member 10A.

[0149] (Fifth variation)

[0150] In the second embodiment described above, an example was given in which the lowest rotor core 2 in the molding process is placed on the tray member 10. However, the technology disclosed herein is not limited to this. In this fourth variation, the lowest rotor core 2 is placed on the tray member 10A in the same manner as the other rotor cores 2.

[0151] like Figure 13 As shown, the rotor core 2 is held by the upper mold 31 and lower mold 32 of the molding apparatus 30 in a state where it is placed on the tray member 10A. Multiple rotor cores 2 are arranged in the molding apparatus 30 in a state of axial alignment. Figure 13 In the example shown, the three rotor cores 2 are respectively arranged in the molding apparatus 30 in a state of being placed on the tray member 10A.

[0152] In the molding apparatus 30, a plurality of plungers 36 press against resin R softened by heating. The plurality of plungers 36 are configured to include a plurality of plungers 36A. The plurality of plungers 36A are arranged circumferentially along the lower mold 32 at positions opposite to the first through hole 16 of the tray member 10A. The plurality of plungers 36A press the resin R toward the first through hole 16. As a result, the softened resin R flows and fills the magnet insertion holes 4 of the rotor core 2 through the first through hole 16. In this way, the magnet insertion holes 4 of the plurality of rotor cores 2 are filled with resin R.

[0153] It should be noted that the example given here is of filling the resin with multiple plungers 36, but this is only one example. For example, it is also possible to press the resin R into the first through hole 16 by using an annular plunger that presses the annular resin sheet. In this fifth variation, the same effect as the second embodiment described above can also be obtained.

[0154] (Sixth variation)

[0155] In the second embodiment described above, an example was given in which the tray member 10A, on which the lowest rotor core 2 is placed, forms part of the resin filling path 35 during the molding process; however, the technology disclosed herein is not limited to this. In this fifth variation, the lowest rotor core 2 is placed in the molding apparatus 30 without passing through the tray member 10A.

[0156] like Figure 14 As shown, the rotor core 2 is held by the upper mold 31 and lower mold 32 of the molding apparatus 30. Multiple rotor cores 2 are arranged in the molding apparatus 30 in a axially aligned configuration. Figure 14In the example shown, the upper and middle rotor cores 2 of the three rotor cores 2 are respectively arranged in the molding apparatus 30 in a state of being placed on the tray member 10A. Moreover, the lowermost rotor core 2 is arranged in the molding apparatus 30 without passing through the tray member 10A.

[0157] In the conveying and / or preheating processes, the bottommost rotor core 2 is supported by the tray member 10 or tray member 10A. Furthermore, before being placed in the molding apparatus 30, the bottommost rotor core 2 is removed from the tray member 10 or tray member 10A and then placed in the molding apparatus 30. The other rotor cores 2 are placed on the bottommost rotor core 2 while still supported by the tray member 10A. It should be noted that the process of placing the other rotor cores 2 on the bottommost rotor core 2 can also be performed outside the molding apparatus 30.

[0158] The lowest rotor core 2 is placed on the upper surface of the gating member 38. A resin filling channel 35 is formed inside the gating member 38. A plunger 34 presses the resin R, which has been softened by heating, toward the gating member 38. As a result, the softened resin R flows and fills the magnet insertion hole 4 of the rotor core 2 through the resin filling channel 35. In this sixth modification, the same effect as in the second embodiment described above can also be obtained.

[0159] <<Third Implementation Method>>

[0160] In the second embodiment described above, an example of configuring the rotor core 2 as multiple layers was given in the molding process, but the technology disclosed herein is not limited thereto. In this third embodiment, the rotor core 2 is also configured as multiple layers in the preheating process.

[0161] Figure 15 This is a schematic diagram illustrating an example of the preheating of the rotor core 2 in this embodiment. (See diagram below.) Figure 15 As shown, a tray member 10A carrying rotor cores 2 is disposed inside a heating furnace 20. Multiple rotor cores 2 are arranged inside the heating furnace 20. The multiple rotor cores 2 are arranged in a configuration along the axial direction of the rotor cores 2. The multiple rotor cores 2 are preheated by the heating furnace 20.

[0162] exist Figure 15 In the example shown, three rotor cores 2 are respectively arranged in the heating furnace 20 on a tray member 10A. When multiple rotor cores 2 are arranged in a axially aligned manner, the first protrusion 14 of the tray member 10A, on which the upper layer of rotor cores 2 is placed, is inserted into the hole 6 of the lower layer of rotor cores 2.

[0163] Furthermore, when multiple rotor cores 2 are arranged in a manner aligned along the axial direction, the magnet insertion holes 4 of each rotor core 2 are connected via the first through hole 16 of the tray member 10A. Additionally, a second through hole 13 is provided in the center of the plate portion 12. When multiple rotor cores 2 are arranged in a manner aligned along the axial direction, the space in the central portion of each rotor core 2 (i.e., the space inside the through hole 5) is connected via the second through hole 13.

[0164] As described above, a flow of heating ambient gas is sometimes generated inside the furnace. This flow of heating ambient gas passes through the through hole 5 and the second through hole 13 of the rotor core 2. That is, the flow of heating ambient gas passes through the space connected by the central portions of the multiple rotor cores 2 arranged axially. Furthermore, the flow of heating ambient gas passes through the magnet insertion hole 4 and the first through hole 16 of the rotor core 2. That is, the flow of heating ambient gas passes through the space connected by the magnet insertion hole 4 of the multiple rotor cores 2 arranged axially. Then, the flow of heating ambient gas passes through the gap t between the plate portion 12 and the furnace bottom 26. Thus, the flow of heating ambient gas is not easily obstructed around the rotor core 2 and the tray member 10A.

[0165] After the preheating process, a molding process is performed. The molding process can be performed either by separating the multiple rotor cores 2 and molding them into one rotor core 2 as in the first embodiment, or by arranging the multiple rotor cores 2 along the axial direction as in the second embodiment.

[0166] Furthermore, an example of three rotor cores 2 arranged axially in the preheating process has been given, but the technology disclosed herein is not limited to this. For example, two rotor cores 2 may be arranged axially, or even four or more rotor cores 2 may be arranged axially. The same applies to the molding process.

[0167] As explained above, the tray member 10A of this third embodiment is used in the preheating process of the rotor cores 2 with multiple rotor cores 2 arranged axially. Furthermore, during the preheating process, a gap t is formed between the plate portion 12 and the furnace bottom 26 via the first protrusion 14, suppressing heat conduction from the tray member 10. This facilitates homogenization of the rotor cores 2, thus shortening the heating time of the rotor cores 2. As a result, it contributes to increased productivity in the rotor manufacturing process.

[0168] Furthermore, in the preheating process, multiple rotor cores 2 can be preheated at once using a single heating furnace 20, which helps to improve productivity. For example, compared to using different heating furnaces 20 to preheat multiple rotor cores 2 separately, the productivity in the rotor manufacturing process is improved.

[0169] Furthermore, when preheating the rotor cores 2 with multiple rotor cores 2 arranged axially, a space is formed through the first through hole 16 of the tray member 10A, connecting the magnet insertion holes 4 of each rotor core 2. Because the space connected via the first through hole 16 allows unobstructed airflow of the heating environment gas inside the magnet insertion holes 4, it facilitates the homogenization of the heating environment gas. As a result, the heating state of the rotor cores 2 around the magnet insertion holes 4 is easily homogenized, which helps to improve the productivity of the rotor manufacturing process.

[0170] Furthermore, when preheating the rotor cores 2 with multiple rotor cores 2 arranged axially, a space is formed through the second through hole 13 of the tray member 10A, connecting the through holes 5 of each rotor core 2. Because the space connected via the second through hole 13 allows unobstructed airflow of the heating environment gas inside the through hole 5, it facilitates the homogenization of the heating environment gas. As a result, the heating state of the rotor core 2 around the magnet insertion hole 4 is easily homogenized, which helps to improve the productivity of the rotor manufacturing process.

[0171] (Other variations)

[0172] It should be noted that, in the above embodiments, examples of heating furnace 20 being a hot air circulating furnace have been given for illustration, but the technology disclosed herein is not limited to this. For example, as a heating method for heating furnace 20, heating methods utilizing lamp heaters, high-frequency heaters, block heaters, and / or infrared heaters may also be used.

[0173] Furthermore, while the above embodiments have described intermittent heating furnace 20 as an example, the technology disclosed herein is not limited thereto. For example, the heating furnace 20 may also be a continuous heating furnace.

[0174] Furthermore, in the above embodiments, examples of filling resin R from the lower mold 32 side in the molding apparatus 30 have been given, but the technology disclosed herein is not limited to this. For example, resin R may also be filled from the upper mold 31 side, or resin R may be filled from both the upper mold 31 and the lower mold 32.

[0175] Furthermore, in the above embodiments, examples were given in which the plate portion 12 appears as a circular plate when viewed from above; however, the technology disclosed herein is not limited to this. The plate portion 12 may also be polygonal (e.g., quadrilateral).

[0176] Furthermore, in the above embodiments, examples of using the tray member 10 for a preheating process prior to the molding process have been given for illustration, but the technology disclosed herein is not limited to this. The tray member 10 can also be used for heating processes other than preheating of the rotor core 2 (e.g., heat treatment processes).

[0177] The descriptions and illustrations shown above are detailed explanations related to the parts of the technology disclosed herein, and are merely examples of the technology disclosed herein. For example, the descriptions related to the structure, function, role, and effect described above are descriptions related to an example of the structure, function, role, and effect of the parts of the technology disclosed herein. Therefore, it goes without saying that unnecessary parts can be deleted, new elements can be added, or substitutions can be made to the descriptions and illustrations shown above without departing from the spirit of the technology disclosed herein. Furthermore, to avoid confusion and facilitate understanding of the parts of the technology disclosed herein, descriptions of common technical knowledge and other related information that do not require special explanation in terms of implementing the technology disclosed herein have been omitted from the descriptions and illustrations shown above.

[0178] In this specification, "A and / or B" has the same meaning as "at least one of A and B". That is, "A and / or B" means either only A, only B, or a combination of A and B. Furthermore, in this specification, the same concept applies when "and / or" is used to associate more than three items.

[0179] All documents, patent applications and technical standards described in this specification are incorporated herein by reference to the same extent that each document, patent application and technical standard is specifically described and incorporated herein by reference.

[0180] Regarding the above-described embodiments, the following notes are further disclosed.

[0181] <Postscript 1>

[0182] A tray component for use in the heating process of an iron core, wherein the tray component comprises:

[0183] The plate portion has a first surface for mounting the aforementioned iron core; and

[0184] The first protrusion protrudes from the second side of the plate portion opposite to the first side, and suppresses heat conduction from the tray member to the support surface supporting the tray member when the iron core placed on the plate portion is heated.

[0185] <Appendix 2>

[0186] According to the pallet component described in Appendix 1, wherein,

[0187] In the aforementioned plate portion, a first through hole is formed at a position opposite to the resin-filled portion of the aforementioned iron core.

[0188] <Appendix 3>

[0189] According to the tray component described in Appendix 2, the tray component is also configured to be used in a filling process for filling the resin filling portion with resin.

[0190] The resin is filled into the resin filling portion through the first through hole.

[0191] <Appendix 4>

[0192] The pallet component according to any one of Annexes 1 to 3, wherein,

[0193] The aforementioned tray component is designed to also be used in a filling process for filling resin into the resin filling section.

[0194] The aforementioned first protrusion is configured to be inserted into a positioning hole located in a mold filled with the aforementioned resin.

[0195] <Appendix 5>

[0196] The pallet component according to any one of Appendices 1 to 4, wherein,

[0197] The aforementioned plate portion has a second protrusion that protrudes from the aforementioned first surface.

[0198] The second protrusion is inserted into a hole formed in the iron core.

[0199] <Appendix 6>

[0200] According to the pallet component described in Appendix 5, wherein...

[0201] Multiple second protrusions are provided along the circumference of the aforementioned iron core.

[0202] <Appendix 7>

[0203] The pallet component according to any one of Annexes 1 to 6, wherein,

[0204] The aforementioned first protrusion includes pin-shaped members, and a plurality of such pin-shaped members are provided along the outer edge of the aforementioned plate portion.

[0205] <Postscript 8>

[0206] The pallet component according to any one of Annexes 1 to 7, wherein,

[0207] The aforementioned first protrusion includes a columnar member located in the central part of the aforementioned plate.

[0208] <Postscript 9>

[0209] The pallet component according to any one of Annexes 1 to 8, wherein,

[0210] In the aforementioned plate portion, a second through hole is formed at a position corresponding to the central through hole of the aforementioned iron core.

[0211] <Postscript 10>

[0212] According to the pallet component described in Appendix 9, wherein...

[0213] The aforementioned tray member has a third protrusion that is disposed along the periphery of the aforementioned second through hole and protrudes from the aforementioned first surface.

[0214] <Postscript 11>

[0215] The pallet component according to any one of Appendices 1 to 10, wherein,

[0216] The aforementioned pallet components are designed to also be used in the conveying process.

[0217] The aforementioned first protrusion is configured to form a gap between the aforementioned plate portion and the conveying surface.

[0218] <Postscript 12>

[0219] A method for manufacturing a motor includes a method for manufacturing a motor core using a tray member. The tray member comprises: a plate portion having a first surface for mounting the core; and a first protrusion protruding from a second surface of the plate portion opposite to the first surface, and suppressing heat conduction from the tray member to a support surface supporting the tray member when the core mounted on the plate portion is heated. The method for manufacturing the motor includes:

[0220] The aforementioned iron core is placed on the aforementioned tray component; and

[0221] The iron core, which is placed on the aforementioned tray component, is heated.

[0222] <Postscript 13>

[0223] A tray component is used in a preheating process of iron cores and a filling process of filling resin into the resin filling portions of each of the plurality of iron cores while they are arranged axially, wherein the tray component comprises:

[0224] The plate portion has a first surface for mounting a first iron core among the plurality of iron cores; and

[0225] The first protrusion protrudes from the second surface of the plate portion, which is opposite to the first surface.

[0226] <Postscript 14>

[0227] According to the pallet component described in Appendix 13, wherein...

[0228] When a second iron core is disposed in the layer below the first iron core among the plurality of iron cores, the first protrusion is configured to be able to be inserted into a hole formed in the second iron core.

[0229] <Postscript 15>

[0230] According to the pallet component described in Appendix 13, wherein...

[0231] The aforementioned plate portion has a second protrusion that protrudes from the aforementioned first surface.

[0232] The second protrusion is inserted into a hole formed in the first iron core.

[0233] <Postscript 16>

[0234] According to the pallet components described in Appendix 14 and Appendix 15, wherein,

[0235] When the hole formed in the second iron core is designated as the second hole and the hole formed in the first iron core is designated as the first hole, the first hole in the first iron core corresponds to the second hole in the second iron core.

[0236] <Postscript 17>

[0237] According to the pallet component described in Appendix 15, wherein,

[0238] The second protrusion is located on the opposite side of the first protrusion, separated from the plate portion.

[0239] <Postscript 18>

[0240] The pallet component according to any one of Annexes 13 to 17, wherein,

[0241] In the aforementioned plate portion, a first through hole is formed at a position opposite to the resin-filled portion of the aforementioned first iron core.

[0242] <Postscript 19>

[0243] According to the pallet component described in Appendix 18, wherein,

[0244] The resin is filled into the resin filling portion through the first through hole.

[0245] <Postscript 20>

[0246] The pallet component according to any one of Annexes 13 to 19, wherein,

[0247] In the aforementioned plate portion, a second through hole is provided at a position corresponding to the central through hole of the aforementioned first iron core.

[0248] <Postscript 21>

[0249] The pallet component according to any one of Annexes 13, 15 and 17 to 20, wherein,

[0250] When the first iron core placed on the tray component is the lowest of the plurality of iron cores, the first protrusion is configured to be insertable into a positioning hole provided in a mold filled with the resin.

[0251] <Postscript 22>

[0252] A method for manufacturing a motor includes a method for manufacturing a motor core using a tray member, the tray member comprising: a plate having a first surface for mounting a first core among a plurality of cores; and a first protrusion protruding from a second surface of the plate opposite to the first surface, wherein the method for manufacturing the motor includes:

[0253] The iron core, placed on the aforementioned tray member, is preheated; and

[0254] With the plurality of iron cores arranged axially across the tray member, resin is filled into the resin filling portion of each of the plurality of iron cores.

[0255] Furthermore, the entire disclosure of Japanese Invention Patent Application No. 2024-054450, filed on March 28, 2024, is incorporated herein by reference. All documents, patent applications, and technical standards described herein are incorporated herein by reference to the same extent that each document, patent application, and technical standard is specifically and separately described and incorporated herein by reference.

Claims

1. A tray component that can be used in the heating process of an iron core, wherein, The tray component includes: The plate portion has a first surface for mounting the iron core; as well as The first protrusion protrudes from the second side of the plate portion opposite to the first side, and suppresses heat conduction from the tray member to the support surface supporting the tray member when the iron core placed on the plate portion is heated.

2. The pallet component according to claim 1, wherein, In the plate portion, a first through hole is formed at a position opposite to the resin-filled portion of the iron core.

3. The pallet component according to claim 2, wherein, The tray component is configured to also be used in a filling process for filling the resin filling portion. The resin is filled into the resin filling portion through the first through hole.

4. The pallet component according to claim 1, wherein, The tray component is designed to also be used in a filling process for filling resin into the resin filling section. The first protrusion is configured to be inserted into a positioning hole located in a mold for filling the resin.

5. The pallet component according to claim 1, wherein, The plate portion has a second protrusion that protrudes from the first surface. The second protrusion is inserted into a hole formed in the iron core.

6. The pallet component according to claim 5, wherein, A plurality of second protrusions are provided along the circumference of the iron core.

7. The pallet component according to claim 1, wherein, The first protrusion includes pin-shaped members, and a plurality of the pin-shaped members are provided along the outer edge of the plate portion.

8. The pallet component according to claim 1, wherein, The first protrusion includes a columnar member located at the center of the plate portion.

9. The pallet component according to claim 1, wherein, In the plate portion, a second through hole is formed at a position corresponding to the central through hole of the iron core.

10. The pallet component according to claim 9, wherein, The tray member has a third protrusion that is disposed along the periphery of the second through hole and protrudes from the first surface.

11. The pallet component according to claim 1, wherein, The pallet component is designed to also be used in the conveying process. The first protrusion is configured to form a gap between the plate portion and the conveying surface.

12. A method for manufacturing a motor, comprising a method for manufacturing a motor core using a pallet member, the pallet member comprising: a plate having a first surface for mounting the core; And a first protrusion, protruding from a second surface opposite to the first surface in the plate portion, and suppressing heat conduction from the tray member to the support surface supporting the tray member when the iron core placed on the plate portion is heated, wherein, The method for manufacturing the motor includes: The iron core is placed on the tray component; as well as The iron core, which is placed on the tray component, is heated.

13. A tray component used in a preheating process of iron cores and in a filling process of filling resin into the resin-filled portions of each of the plurality of iron cores in a state in which the plurality of iron cores are arranged axially, wherein, The tray component includes: The plate portion has a first surface for mounting a first iron core among the plurality of iron cores; as well as The first protrusion protrudes from the second surface of the plate portion, which is opposite to the first surface.

14. The pallet component according to claim 13, wherein, When a second core is disposed in the layer below the first core of the plurality of cores, the first protrusion is configured to be able to be inserted into a hole formed in the second core.

15. The pallet component according to claim 13, wherein, The plate portion has a second protrusion that protrudes from the first surface. The second protrusion is inserted into a hole formed in the first iron core.

16. The pallet component according to claims 14 and 15, wherein, When the hole formed in the second iron core is designated as the second hole and the hole formed in the first iron core is designated as the first hole, the first hole in the first iron core corresponds to the second hole in the second iron core.

17. The pallet component according to claim 15, wherein, The second protrusion is located on the opposite side of the first protrusion, separated from the plate portion.

18. The pallet component according to claim 13, wherein, In the plate portion, a first through hole is formed at a position opposite to the resin-filled portion of the first iron core.

19. The pallet component according to claim 18, wherein, The resin is filled into the resin filling portion through the first through hole.

20. The pallet component according to claim 13, wherein, In the plate portion, a second through hole is provided at a position corresponding to the central through hole of the first iron core.

21. The pallet component according to claim 13, wherein, When the first iron core placed on the tray component is the lowest of the plurality of iron cores, the first protrusion is configured to be insertable into a positioning hole located in a mold filled with the resin.

22. A method for manufacturing a motor, which is a method for manufacturing a motor core using a tray member, the tray member comprising: a plate having a first surface for mounting a first core among a plurality of cores; And a first protrusion, protruding from a second surface of the plate portion opposite to the first surface, wherein, The method for manufacturing the motor includes: The iron core is preheated while it is placed on the tray component; as well as With the plurality of iron cores arranged axially across the tray member, resin is filled into the resin filling portion of each of the plurality of iron cores.

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