JP2021154299A - Method for production of collapsible core - Google Patents

Abstract

To provide a collapsible core production method suitable for production of one-piece cylindrical member in which plural radial columns are arranged.SOLUTION: A production method for a collapsible core (7) used for production of a cylindrical member (60) in a rotary electric machine (10) includes: a process of solidifying a core material between the inner periphery side molds (70) which are pluralized by division in a circumferential direction around an axis (I) and the outer periphery side molds (80) which are pluralized by the same division as above; and a mold releasing process of separating the solidified core material from the inner and outer periphery side molds. The outer peripheral face of the inner periphery side mold has plural first protrusion parts (700) protruding in a radical direction in a first peripheral range (A1) among whole circumference in a circumferential direction, and the inner peripheral face of the outer periphery side mold has plural second protrusion parts (800) protruding in the radical direction in a second peripheral range (A2) among the above whole circumference in the circumferential direction. In the case of the second peripheral range, the production method in which a circumferential phase is different from that of the first one is disclosed.SELECTED DRAWING: Figure 14

Description

The present disclosure relates to a method for producing a disintegrating core.

A technique is known in which a plurality of columns in the radial direction are arranged between two cylindrical members having different diameters, and a refrigerant flows between the columns.

Chinese Patent Publication No. 10294386

However, in the above-mentioned conventional technique, since it is necessary to combine two cylindrical members having different diameters (the cylindrical member on the inner diameter side and the cylindrical member on the outer diameter side), a gap between the members is likely to occur. .. If such a gap is generated, a flow of refrigerant may be generated in the gap and the desired cooling effect may not be obtained.

Therefore, an object of the present disclosure is to provide a method for producing a collapsible core suitable for producing a one-piece cylindrical member in which a plurality of radial columns are arranged.

On one side, the present invention is a method of manufacturing a collapsible core used in the manufacture of a cylindrical member of a rotary electric machine.
A step of solidifying the core material between the inner peripheral mold divided into a plurality of molds in the circumferential direction and the outer peripheral mold divided into a plurality of molds in the circumferential direction.
Including a mold release step of separating the solidified core material from the inner peripheral side mold and the outer peripheral side mold.
The outer peripheral surface of the inner peripheral mold has a plurality of first projecting portions projecting in the radial direction in the first peripheral range of the entire circumference in the circumferential direction.
The inner peripheral surface of the outer peripheral mold has a plurality of second protrusions protruding in the radial direction in the second peripheral range of the entire circumference in the circumferential direction.
A manufacturing method is provided in which the first peripheral range and the second peripheral range are different in phase in the circumferential direction.

On one side, according to the present invention, it is possible to provide a method for producing a collapsible core suitable for producing a one-piece cylindrical member in which a plurality of radial columns are arranged.

It is a front view which shows the appearance of a motor schematicly. It is a side view (plan view seen in the axial direction) which shows a part of a motor roughly. It is sectional drawing which shows roughly the part of the motor when cut in the plane passing through the central axis of the motor. It is a perspective view which shows the simple substance of the core which concerns on a cooling water channel. It is a top view of the state of a single item of a stator core. It is sectional drawing along the radial direction of a stator. It is sectional drawing along the axial direction of a stator. It is a three-sided view of one coil piece. It is a schematic flowchart which shows the flow of the manufacturing method of a stator. It is an enlarged view of the Q1 part of FIG. It is a perspective view which shows schematicly about the disintegrating core according to this Example. It is a perspective view which shows an example of the inner peripheral side mold roughly. It is a perspective view which shows an example of the outer peripheral side mold schematically. It is explanatory drawing of the moving direction of the inner peripheral side mold and the outer peripheral side mold in a mold release process. It is an enlarged view of the part Q13 of FIG. It is a perspective view which shows typically the inner peripheral side mold by the comparative example.

Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings.

In the following, prior to the detailed description of the disintegrating core according to the present embodiment and the method for producing the same, first, with reference to FIGS. 1 to 8, the disintegrating core according to the present embodiment is used for production. Describes a suitable configuration of the motor 10 and then outlines a method of manufacturing the motor 10 using the collapsible core according to the present embodiment with reference to FIG.

FIG. 1 is a front view schematically showing the appearance of the motor 10, FIG. 2 is a side view (plan view seen in the axial direction) showing a part of the motor 10, and FIG. 3 is a plan view. FIG. 5 is a cross-sectional view schematically showing a part of the motor 10 when cut in a plane passing through the central axis I of the motor 10. FIG. 4 is a perspective view showing a single core 795A related to the cooling water channel 95. In FIGS. 1 to 3, the rotor of the motor 10 is not shown, and the stator coil 114 and the like are shown very schematically.

In the following, unless otherwise specified, the radial direction is based on the central axis I (= central axis of the stator core 112) of the motor 10. Further, in the following description, the vertical direction represents the vertical direction in the mounted state of the motor 10 mounted so that the central axis I is substantially parallel to the horizontal direction. In FIG. 1 and the like, the Z direction corresponding to the vertical direction and the X direction corresponding to the axial direction are shown. In this case, the Z direction is orthogonal to the central axis I, the Z1 side is the upper side, and the Z2 side is the lower side.

The motor 10 includes a rotor (not shown) and a stator 10b, which includes a stator core 112 and a stator coil 114. The stator coil 114 includes coil ends 220A and 220B at both ends in the axial direction.

Further, the motor 10 includes a support case 60 (an example of a cylindrical member).

As shown in FIGS. 1 and 2, the support case 60 has a cylindrical shape and can function as a case for the motor 10. The support case 60 is, for example, in a form in which both sides in the axial direction are open (a form in which the support case 60 does not substantially overlap the stator core 112 when viewed in the axial direction). The support case 60 is coupled to other case members 60A, 60B (schematically illustrated by an alternate long and short dash line in FIG. 3) on both sides in the axial direction. Although not shown in FIG. 3, the case member 60A or 60B on one end side in the axial direction may rotatably support the rotor (not shown). Note that FIGS. 2 and 3 show holes 610 for bolt connection with other case members 60A and 60B. As described above, the support case 60 may be coupled to the other case members 60A and 60B in such a manner that the axial end surface abuts on the axial end surface of the other case members 60A and 60B in the axial direction. The bolt connection hole 610 may be in the form of a through hole penetrating in the axial direction or in the form of a non-through hole.

The support case 60 is formed of a material containing aluminum as a main component. For example, the support case 60 is preferably made of an aluminum alloy having good corrosion resistance because it forms a cooling water channel 95 through which cooling water passes as described later. The aluminum alloy is arbitrary, for example, an Al—Si based alloy, an Al—Mg based alloy, an Al—Mg—Si based alloy, or the like.

The support case 60 has a structure having a hollow portion (cavity) forming a case oil passage 35 and a cooling water passage 95 (see FIG. 3) as described later. The support case 60 having such a hollow portion is a one-piece member and may be formed by casting.

Specifically, the support case 60 is preferably formed using a collapsible core (nesting) (see core 795A in FIG. 4). Here, FIG. 4 schematically shows the core 795A related to the cooling water channel 95, but the core related to the case oil channel 35 is also prepared in the same manner. The core 795A shown in FIG. 4 is provided with a cylindrical portion 7951 for forming the cooling water channel 95, and the cylindrical portion 7951 has a plurality of holes 1951A (through holes in the radial direction) for forming the cylindrical portion 1951. It is formed. Further, the core 795A includes an axial groove portion 957A, and the axial groove portion 957A is a partition wall for axially blocking the circumferential continuity of the cooling water channel 95 in the zenith region of the support case 60. Form (not shown). The groove portion 957A has a form of penetrating in the radial direction. Further, the core 795A has columnar portions 942A and 944A for forming an inlet water channel 942 and an outlet water channel 944.

In the support case 60, such two cores are placed in a mold (not shown) with a radial gap between the cores related to the cooling water channel 95 inside the cores related to the case oil passage 35 in the radial direction. It can be formed (cast) by injecting a molten metal material (material of the support case 60, for example, an aluminum alloy) into the mold by setting the metal material (which is a material of the support case 60, for example, an aluminum alloy). In this case, each core may be, for example, a disintegrating salt core, and the salt is dissolved and removed by injecting water into each core portion of the casting taken out from the mold. As a result, the core portion related to the case oil passage 35 (the portion around the hole for forming the cylindrical portion 1351) becomes a space (space such as the case oil passage 35), and the core portion related to the cooling water passage 95 (the portion around the hole). As shown in FIG. 4, the portion around the hole 1951A for forming the cylindrical portion 1951) becomes a space (a space such as a cooling water channel 95), and is related to the core related to the case oil channel 35 and the cooling water channel 95 in the radial direction. The gap between the core and the core (the annular gap extending in the axial direction over substantially the entire length of the support case 60 in the axial direction) becomes the boundary wall surface portion 652 (see FIG. 3), and the outer peripheral surface of the mold and the case oil passage. The gap between the radial outer surface of the core according to 35 (an annular gap extending in the axial direction over substantially the entire length of the support case 60 in the axial direction) is the outer diameter side wall surface portion 653 (see FIG. 3). The inner diameter is the gap between the inner peripheral surface of the mold and the radial inner surface of the core related to the cooling water channel 95 (an annular gap extending in the axial direction over substantially the entire length of the support case 60 in the axial direction). Support case 60 that serves as a side wall surface portion 651 (see FIG. 3) and has a gap (annular gap) between the mold and both end faces in the axial direction of each core as both end wall portions 660 (see FIG. 3). Can be manufactured.

The support case 60 holds the stator core 112 inward in the radial direction so as to contact the stator core 112 in the radial direction. That is, the support case 60 holds the stator core 112 in such a manner that it covers the radial outer surface of the stator core 112 without gaps. In this way, the support case 60 non-rotatably supports the stator 10b including the stator core 112.

The support case 60 and the stator core 112 are integrated by joining instead of fastening with bolts. That is, in the support case 60, the radial inner surface of the stator core 112 is joined to the radial outer surface of the stator core 112. The method of joining the support case 60 and the stator core 112 will be described later.

The support case 60 preferably holds the stator core 112 in such a manner that the radial inner surface is in contact with substantially the entire radial outer surface of the stator core 112 (surface contact mode). In this case, the entire stator core 112 can be efficiently cooled by the cooling water passing through the cooling water channel 95 in the support case 60. Here, as an example, as shown in FIG. 3, the support case 60 extends over the entire length of the stator core 112 in the X direction, and its inner peripheral surface is in contact with substantially the entire outer peripheral surface of the stator core 112. The "substantially the entire" outer peripheral surface of the stator core 112 is defined as a portion such as a welding groove (not shown) of the stator core 112 (the outer peripheral surface of the stator core 112 and the inner peripheral surface of the support case 60 are separated in the radial direction). It is a concept that allows the place where it can be welded.

The support case 60 forms a case oil passage 35 and a cooling water passage 95 inside. At this time, the stator core 112, the cooling water channel 95, and the case oil channel 35 are arranged adjacent to each other in this order from the inside in the radial direction. In addition, "adjacent" refers to a mode in which only the material portion related to the support case 60 is intervened.

The cooling water channel 95 is connected to the inlet water channel 942 and the outlet water channel 944. Specifically, the cooling water channel 95 has an upstream end connected to the inlet water channel 942 and a downstream end connected to the outlet water channel 944. As shown in FIG. 1, the inlet channel 942 and the outlet channel 944 may be formed so as to project from the radial outer side of the support case 60 to the radial outer side (upper side in the vertical direction).

The cooling water channel 95 extends in the circumferential direction in the axial extension range of the stator core 112. Here, as an example, the cooling water channel 95 is formed around a large number of columnar portions 1951 (columnar portions extending in the radial direction) (see FIGS. 3 and 4). More specifically, in the cooling water channel 95, the inner side in the radial direction is partitioned by the inner diameter side wall surface portion 651, the outer diameter in the radial direction is partitioned by the boundary wall surface portion 652, and both end portions in the axial direction are closed by both end wall portions 660. Will be done. Then, in the annular space formed in this way (the annular space extending in the axial direction over substantially the entire length of the support case 60 in the axial direction), the inner diameter side wall surface portion 651 to the boundary wall surface portion 652 in the radial direction. A large number of columnar portions 1951 extending to the area are arranged. The large number of columnar portions 1951 function so that the cooling water flows without stagnation over the entire radial outer surface of the stator core 112 while resisting the flow. A large number of columnar portions 1951 may be dispersedly arranged in a substantially even manner in the annular space. One end of the cooling water channel 95 in the axial direction is connected to the inlet water channel 942, and the other end in the axial direction is connected to the outlet water channel 944.

As described above, the core 795A shown in FIG. 4 includes an axial groove portion 957A for forming an axial partition wall (not shown) in the zenith region of the support case 60, and the groove portion 957A includes a groove portion 957A. It is a form that penetrates in the radial direction. By having the partition wall corresponding to the groove portion 957A, the cooling water channel 95 can prevent the flow of the cooling water linearly flowing from the inlet water channel 942 to the outlet water channel 944. That is, since the cooling water introduced from the inlet water channel 942 needs to flow in the axial direction while orbiting the radial outside of the stator core 112 in order to reach the outlet water channel 944, it is a straight line from the inlet water channel 942 to the outlet water channel 944. The stator core 112 can be effectively cooled as compared with the case where the cooling water flows like this.

The case oil passage 35 extends in the circumferential direction in the axial extension range of the stator core 112. Here, as an example, the case oil passage 35 is formed around a large number of cylindrical portions 1351 (cylindrical portions extending in the radial direction) (see FIG. 3). More specifically, in the case oil passage 35, the inner side in the radial direction is partitioned by the boundary wall surface portion 652, the outer diameter in the radial direction is partitioned by the outer diameter side wall surface portion 653, and both end portions in the axial direction are both end wall portions 660. Is blocked by. Then, in the annular space formed in this way (the annular space extending in the axial direction over substantially the entire length of the support case 60 in the axial direction), the diameter is from the boundary wall surface portion 652 to the outer diameter side wall surface portion 653. A large number of columnar portions 1351 extending in the direction are arranged. A large number of columnar portions 1351 may be dispersedly arranged in a substantially even manner in the annular space.

Further, here, as an example, as shown in FIG. 3, the case oil passage 35 includes a first oil passage portion 351 on one side in the axial direction and a second oil passage portion 352 on the other side in the axial direction. including. The first oil passage portion 351 and the second oil passage portion 352 are independent oil passage portions that do not communicate with each other except on the upstream side of the inlet oil passages 330 and 331. As shown in FIG. 1, the inlet oil passages 330 and 331 may be formed so as to project from the radial outer side of the support case 60 to the radial outer side (lower side in the vertical direction).

The first oil passage portion 351 extends in the circumferential direction on one side (X1 side in this example) of the axial extension range of the stator core 112. The first oil passage portion 351 has a cylindrical shape around the central axis I (a cylindrical shape having a cylindrical portion 1351 in the radial direction as described above), one end communicating with the inlet oil passage 330 and the other end. Opens at the oil dropping part (not shown).

The second oil passage portion 352 extends in the circumferential direction on the other side (X2 side in this example) of the axial extension range of the stator core 112. The second oil passage portion 352 has a cylindrical shape around the central axis I (a cylindrical shape having a cylindrical portion 1351 in the radial direction as described above), one end communicating with the inlet oil passage 331 and the other end. Opens at the oil dropping part (not shown).

Here, as an example, the first oil passage portion 351 and the second oil passage portion 352 have a symmetrical form separated near the center of the axial extension range of the stator core 112. As a result, it becomes easy to uniformly cool the stator core 112 with the oil passing through each of the first oil passage portion 351 and the second oil passage portion 352 while separating the case oil passage 35 in the axial direction. However, in the modified example, the first oil passage portion 351 and the second oil passage portion 352 may have an asymmetrical shape with respect to the center of the axial extension range of the stator core 112, or like the cooling water channel 95. The first oil passage portion 351 and the second oil passage portion 352 may be communicated (continuously).

Here, the flow of cooling water and oil in the cooling water channel 95 and the case oil channel 35 described above will be outlined.

The cooling water supplied to the inlet water channel 942 (see arrow R1 in FIG. 1) enters the cooling water channel 95, passes through the cooling water channel 95, and goes around the central axis I on the radial outer side of the stator core 112, and is X2 from the X1 side. It flows to the side and exits from the outlet channel 944 (see arrow R3 in FIG. 1).

The oil supplied to the inlet oil passages 330 and 331 (see arrow R10 in FIG. 1) is supplied to the first oil passage portion 351 and the second oil passage portion 352 of the case oil passage 35, and is supplied to the first oil passage portion 351. The supplied oil flows toward the X1 side while rotating around the central axis I, reaches the zenith region at the end on the X1 side, and is dropped from the oil dropping portion (not shown) to the coil end 220A on the X1 side (not shown). Not shown). Similarly, the oil supplied to the second oil passage portion 352 flows toward the X2 side while rotating around the central axis I, reaches the zenith region at the X2 side end portion, and reaches the zenith region at the X2 side end portion from the oil dropping portion (not shown) to the X2. It is dropped on the coil end 220B on the side (not shown).

According to the examples shown in FIGS. 1 to 4, since the support case 60 forming the cooling water channel 95 is in contact with the stator core 112, only the inner diameter side wall surface portion 651 of the support case 60 is between the cooling water and the stator core 112. Only exists. Here, the cooling water is cooled by exchanging heat with the outside air (for example, the air passing when the vehicle is traveling) by a radiator (not shown), and the oil is cooled by exchanging heat with the cooling water in the cooling water channel 95. Cooling water is cooler than oil because it is a thing. Therefore, the stator core 112 can be efficiently cooled by the cooling water as compared with the case where another medium or member such as oil is interposed between the cooling water and the stator core 112.

Further, according to the example shown in FIGS. 1 to 4, as described above, the cooling water channel 95 extends radially outside the stator core 112 over the entire axial direction of the stator core 112 and extends over the entire circumferential direction. Therefore, heat can be taken from the entire stator core 112.

Further, according to the examples shown in FIGS. 1 to 4, since the cooling water passage 95 and the case oil passage 35 are formed in the support case 60, between the cooling water passage 95 and the case oil passage 35 in the support case 60. Boundary can be formed. That is, since the support case 60 forming the cooling water channel 95 forms the case oil channel 35, only the boundary wall surface portion 652 of the support case 60 exists between the cooling water and the oil in the radial direction. Therefore, the oil can be efficiently cooled by the cooling water as compared with the case where, for example, another member is interposed between the cooling water and the oil. Therefore, according to the examples shown in FIGS. 1 to 4, the oil cooler can be eliminated even in the motor 10 having a relatively high output.

Further, according to the examples shown in FIGS. 1 to 4, as described above, the support case 60 is a one-piece member, but the cooling water passage 95 and the case oil passage 35 are formed inside, so that there are two. Compared with a configuration in which a support case such as the support case 60 is formed by connecting the above members, the number of parts can be reduced, and a structure for connecting (for example, a bolt fastening structure) becomes unnecessary. A simple configuration can be realized.

In the examples shown in FIGS. 1 to 4, the oil in the case oil passage 35 may always be circulated during the operation of the motor 10, or may be circulated only for a part of the period during the operation of the motor 10. You may. For example, since the oil in the case oil passage 35 is mainly used for cooling the coil ends 220A and 220B as described above, the oil may be circulated only during a period in which the heat generation of the coil ends 220A and 220B becomes relatively large.

Although the motor 10 having a specific structure is shown in FIGS. 1 to 4, the structure of the motor 10 is arbitrary as long as it has a cylindrical member having an oil passage such as a cooling water passage 95 and a case oil passage 35. be. Therefore, the support case 60 does not have to have one of the cooling water channel 95 and the case oil channel 35. Further, although specific cooling methods are disclosed in FIGS. 1 to 4, the cooling method of the motor 10 is arbitrary. Therefore, for example, the cooling water channel 95 and the case oil channel 35 may be formed so that the cooling water and the oil spiral around the central axis I, respectively.

Next, the stator core 112 and the stator coil 114 of the motor 10 will be described with reference to FIGS. 5 to 8.

FIG. 5 is a plan view of the stator core 112 in a single item state. FIG. 6 is a cross-sectional view taken along the radial direction of the stator 10b in a state where the coil piece 52 is assembled to the stator core 112. FIG. 7 is a cross-sectional view taken along the axial direction of the stator 10b in a state where the coil piece 52 is assembled to the stator core 112. Note that FIG. 7 also shows an enlarged view of the Q2 portion in the figure.

As described above, the stator 10b includes a stator core 112 and a stator coil 114.

The stator core 112 is formed of a material containing iron as a main component. For example, the stator core 112 is made of, for example, an annular ferromagnetic laminated steel plate, but in a modified example, the stator core 112 may be formed of a green compact obtained by compressing and solidifying a magnetic powder. The stator core 112 may be formed by a divided core that is divided in the circumferential direction, or may be in a form that is not divided in the circumferential direction. A plurality of slots 220 around which the stator coil 114 is wound are formed inside the stator core 112 in the radial direction. Specifically, as shown in FIG. 5, the stator core 112 includes an annular back yoke 22A and a plurality of teeth 22B extending radially inward from the back yoke 22A, and a plurality of teeth 22B in the circumferential direction. A slot 220 is formed between them. The number of slots 220 is arbitrary, but here, as an example, it is 48. The width of the slot 220 on the inner side in the radial direction (width in the circumferential direction) may be set to be smaller than the width on the outer side in the radial direction.

The stator coil 114 includes a U-phase coil, a V-phase coil, and a W-phase coil (hereinafter, referred to as a "phase coil" when U, V, and W are not distinguished). The base end of each phase coil is connected to an input terminal (not shown), and the end of each phase coil is connected to the end of another phase coil to form the neutral point of the motor 10. That is, the stator coil 114 is star-connected. However, the connection mode of the stator coil 114 may be appropriately changed according to the required motor characteristics and the like. For example, the stator coil 114 may be delta-connected instead of the star connection.

Each phase coil is configured by coupling a plurality of coil pieces 52. FIG. 8 is a three-view view of one coil piece 52. The coil piece 52 is in the form of a segment coil (segment conductor) in which the phase coil is divided into units that are easy to assemble (for example, units that are inserted into the two slots 220). The coil piece 52 is formed by coating a linear conductor (flat wire) having a substantially rectangular cross section with an insulating coating (not shown). Here, the linear conductor is made of copper, for example. However, in the modified example, the linear conductor may be formed of another conductor material such as iron.

One coil piece 52 is formed by coupling a first segment conductor 52A on one side in the axial direction and a second segment conductor 52B on the other side in the axial direction. The first segment conductor 52A and the second segment conductor 52B are each formed into a substantially U shape having a pair of linear conductor side portions 50 and a crossover portion 54 connecting the pair of conductor side portions 50. May be done. When assembling the coil piece 52 to the stator core 112, the pair of conductor side portions 50 are each inserted into the slots 220 (see FIG. 7). In this case, the coil piece 52 can be assembled, for example, in the axial direction.

A plurality of conductor side portions 50 of the coil piece 52 shown in FIG. 7 are inserted into one slot 220 side by side in the radial direction. Therefore, a plurality of crossovers 54 extending in the circumferential direction are arranged in the radial direction at both ends of the stator core 112 in the axial direction. Here, as an example, eight coil pieces 52 are assembled in one slot 220 (that is, an eight-layer winding structure). The crossover portion 54 generates coil ends 220A and 220B.

Here, as shown in FIG. 8, the first segment conductor 52A has one of the conductor side portions 50 on both sides in the circumferential direction being long and the other is short, and the second segment conductor 52B has conductor side portions on both sides in the circumferential direction. The other of the 50 is long and one is short. As a result, the two joints of the first segment conductor 52A and the second segment conductor 52B can be offset in the axial direction. Further, here, in the first segment conductor 52A and the second segment conductor 52B, one of the conductor side portions 50 on both sides in the circumferential direction can be coupled, while the other layer is one layer in the radial direction. Offset in the direction separated from each other by the amount. Specifically, the first segment conductor 52A and the second segment conductor 52B are provided with offset portions 521A and 521B at the tops of the facing surfaces 42, respectively, and the offset portions 521A and 521B realize offsets in the opposite directions in the radial direction. do.

The coil piece 52 is wound around the stator core 112 in the form of lap winding. In this case, as shown in FIG. 7, the first segment conductor 52A and the second segment conductor 52B constituting one coil piece 52 are the conductor sides on one side of the conductor side portions 50 on both sides in the circumferential direction, respectively, as shown in FIG. The connecting portions 40 of the portions 50 are joined to each other. In this case, the conductor side portion 50 on the other side is coupled to the other coil piece 52. At this time, the coupling portion 40 has facing surfaces 42 that face each other in the radial direction and come into surface contact with each other, and the coupling portions 40 are coupled to each other in a state where the facing surfaces 42 overlap each other.

Welding is used as a bonding method when connecting the coupling portions 40 of the coil pieces 52 to each other. For example, as the welding method, arc welding typified by TIG welding may be adopted, or laser welding using a laser beam source as a heat source may be adopted.

According to the example shown in FIGS. 5 to 8, since the stator coil 114 is formed by the coil piece 52 in the form of a segment coil, the space factor in the slot 220 of the stator core 112 can be effectively increased. .. The configuration of the stator coil 114 may be the same as that described in Pamphlet No. 2019/059293 (WO2019 / 059293 A1) of International Patent Publication No. 2019/059293, and the contents described in the document may be referred to here. To be incorporated herein by. For example, the first segment conductor 52A and the second segment conductor 52B of the coil piece 52 may be the same as the first segment conductor and the second segment conductor of the coil piece described in the document.

Although FIGS. 5 to 8 show a stator core 112 and a stator coil 114 having a specific structure, in the structure of the stator core 112 and the stator coil 114, the stator coil 114 is formed of a coil piece 52 in the form of a segment coil. As long as it is optional. Further, the coil piece in the form of a segment coil is not limited to the form in which the coil piece is coupled in the slot 220 of the stator core 112 such as the coil piece 52, but is in another form such as the form in which the coil piece is coupled on one end side in the axial direction. You may. Further, the winding method of the stator coil 114 is also arbitrary, and a winding method other than the above-mentioned lap winding form such as the wave winding form may be used.

Next, with reference to FIGS. 9 and 9 onward, a method of joining the support case 60 and the stator core 112 will be described together with a method of manufacturing the stator 10b.

FIG. 9 is a schematic flowchart showing a flow of a manufacturing method of the stator 10b, and FIG. 10 is an explanatory view of a joining method between the support case 60 and the stator core 112, showing the stator core 112 in a state where the joining layer 61 is formed. It is an enlarged view (enlarged view of Q1 part of FIG. 5).

The method of manufacturing the stator 10b includes first preparing the stator core 112 (step S30). The stator core 112 is made of, for example, an annular ferromagnetic laminated steel plate. In this case, the steel plates may not be bonded to each other, or may be bonded by welding or the like.

Next, the method of manufacturing the stator 10b includes forming a bonding layer 61 (see FIG. 10) on the surface (diameter outer surface) of the stator core 112 (step S32). The bonding layer 61 is a layer for facilitating the bonding of the aluminum-based material introduced in the next step to the surface of the stator core 112, and the bonding layer 61 is an alloy layer of iron and aluminum. The iron-aluminum alloy layer can be formed, for example, by performing an aluminaizing treatment. In the case of the aluminizing treatment, a part of the surface of the stator core 112 is melted to form an alloy layer with aluminum. Since a part of the surface of the stator core 112 is melted to form the joint layer 61, the joint layer 61 and the stator core 112 are firmly integrated.

The bonding layer 61 is preferably formed so as to cover the entire range of the stator core 112 to be bonded to the support case 60. Thereby, the joint between the stator core 112 and the support case 60 can be strengthened over the entire joint range between the stator core 112 and the support case 60.

Next, the method of manufacturing the stator 10b includes setting the stator core 112 on which the bonding layer 61 is formed in a mold (not shown) (step S34). At this time, the core for forming the case oil passage 35 and the cooling water passage 95 described above (see the core 795A in FIG. 4) is set in the mold.

Next, in the method of manufacturing the stator 10b, a material containing aluminum as a main component (hereinafter, also simply referred to as “aluminum material”) is applied to a mold in which the stator core 112 (stator core 112 on which the bonding layer 61 is formed) is set. The support case 60 is cast by casting (injecting) in a melted state (step S36). Here, a mold casting (aluminum gravity casting) method is adopted in which casting is performed only by the weight of the melted aluminum material, but other casting methods may be used.

Here, the bonding layer 61 is formed on the surface of the stator core 112 set in the mold as described above. Therefore, when the molten aluminum material is introduced into the mold, the aluminum material is integrated with the aluminum contained in the joint layer 61. In this way, the support case 60 can be firmly bonded to the surface of the stator core 112 via the bonding layer 61.

The method of manufacturing the stator 10b then includes "collapse" the core (see core 795A in FIG. 4) for forming the case oil passage 35 and the cooling water passage 95 described above (step S38). As a result, the above-mentioned case oil passage 35 and cooling water passage 95 are formed inside the support case 60.

Next, the method of manufacturing the stator 10b includes assembling the coil piece 52 to the stator core 112 to which the support case 60 is joined as described above (step S40). In this case, the coil piece 52 can be easily assembled in the slot 220 of the stator core 112 in the axial direction (or from the inside in the radial direction).

Next, the method for manufacturing the stator 10b includes coupling the coil pieces 52 to each other (coupling step) (step S42).

In this way, according to the example shown in FIG. 9, by forming the bonding layer 61 by the aluminizing treatment, the stator 10b in which the stator core 112 and the support case 60 are firmly bonded can be easily manufactured. A rotor (not shown) can be assembled inside the stator 10b manufactured in this manner in the radial direction to form the motor 10.

In FIG. 9, the bonding layer 61 is formed by the aluminizing treatment, but instead of or in addition to this, a wedge-shaped convex portion may be formed on the surface of the stator core 112 to increase the bonding strength.

Next, with reference to FIGS. 11 and 11 onward, the collapsing core 7 according to this embodiment and the method for producing the same will be described in detail. The collapsible core 7 described below is applicable to the core 795A (and the core according to the case oil passage 35) described above. In the following, the "axis" corresponds to the central axis I of the motor 10. Further, the term "predetermined" is used to mean "predetermined".

FIG. 11 is a perspective view schematically showing the collapsing core 7 according to the present embodiment.

As shown in FIG. 11, the collapsing core 7 has a cylindrical shape and has a plurality of holes 7A and 7B penetrating in the radial direction. The plurality of holes 7A and 7B are a plurality of first holes 7A formed in the first circumferential range A1 of the entire circumference in the circumferential direction of the cylindrical form, and the first of the entire circumferences of the circumferential direction of the cylindrical form. It includes a plurality of second holes 7B formed in the two-circle range A2.

The first circumference range A1 and the second circumference range A2 have different phases in the circumferential direction (phase around the axis). In this embodiment, as shown in FIG. 11, the first lap range A1 and the second lap range A2 appear alternately every 45 degrees around the axis (in FIG. 11, the symbols “A1” and ”are only partially shown. "A2" is given). In the modified example, the first lap range A1 and the second lap range A2 may be set alternately for each angle other than 45 degrees.

The opening area of the first hole 7A decreases toward the outside in the radial direction, and the opening area of the second hole 7B increases toward the outside in the radial direction. This will be described later in relation to the shape of the first protruding portion 700 of the inner peripheral side mold 70 and the shape of the second protruding portion 800 of the outer peripheral side mold 80.

FIG. 12 is a perspective view schematically showing an example of the inner peripheral side mold 70. FIG. 13 is a perspective view schematically showing an example of the outer peripheral side mold 80.

The collapsible core 7 is formed by using the inner peripheral side mold 70 and the outer peripheral side mold 80. Specifically, the method for forming the collapsible core 7 is a core containing salt or the like between the outer peripheral surface of the inner peripheral mold 70 and the inner peripheral surface of the outer peripheral mold 80 (between the radial directions). A step of solidifying the material and a molding step of separating the solidified core material from the inner peripheral side mold 70 and the outer peripheral side mold 80 (separating the molded product from the inner peripheral side mold 70 and the outer peripheral side mold 80). The step of molding) and is included.

The inner peripheral side mold 70 is divided into a plurality of molds in the circumferential direction around the axis. In this embodiment, the inner peripheral mold 70 includes four parts 71, 72, 73, 74. The four parts 71, 72, 73, 74 form an outer peripheral surface extending 360 degrees all around. The parts 71 and 72 are arranged so as to face each other (that is, they are arranged diagonally). Each of the portions 71 and 72 forms an outer peripheral surface corresponding to 45 degrees. The parts 71 and 72 may have the same configuration as each other. The parts 73 and 74 are arranged so as to face each other (that is, they are arranged diagonally). Each of the portions 73 and 74 forms an outer peripheral surface of 135 degrees. The parts 73 and 74 may have the same configuration as each other. The parts 71 and 72 are arranged between the parts 73 and 74 in the circumferential direction, respectively.

The inner peripheral side mold 70 has a first protruding portion 700 on the outer peripheral surface. The first protrusion 700 is provided to form the first hole 7A of the collapsed core 7 described above. Therefore, the inner peripheral side mold 70 has the first protruding portion 700 in the circumferential range corresponding to the first peripheral range A1 described above. Each of the four portions 71, 72, 73, 74 has a first protruding portion 700 according to one first peripheral range A1. The first protruding portion 700 related to the first peripheral range A1 is formed over the entire circumferential direction of the first peripheral range A1. As a result, the first protruding portion 700 (and the first hole 7A accordingly) can be formed at a high density in the circumferential direction.

The outer peripheral mold 80 is divided into a plurality of molds in the circumferential direction around the axis. In this embodiment, the outer peripheral mold 80 includes four parts 81, 82, 83, 84. The four sites 81, 82, 83, 84 form an inner peripheral surface over 360 degrees all around. Sites 81, 82, 83, 84 may each have the same configuration, as shown in FIG. The parts 81 and 83 are arranged so as to face each other (that is, they are arranged diagonally). Each of the portions 81 and 83 forms an inner peripheral surface for 90 degrees. The parts 82 and 84 are arranged so as to face each other (that is, they are arranged diagonally). The parts 82 and 84 form an inner peripheral surface for 90 degrees, respectively. The portions 81 and 83 are arranged between the portions 82 and 84 in the circumferential direction, respectively. The outer peripheral mold 80 has a second protruding portion 800 on the inner peripheral surface. The second protrusion 800 is provided to form the second hole 7B of the collapsed core 7 described above. Therefore, the outer peripheral side mold 80 has the second protruding portion 800 in the peripheral range corresponding to the above-mentioned second peripheral range A2. Each of the four sites 81, 82, 83, 84 has a second protrusion 800 that relates to one second peripheral range A2. The second protruding portion 800 related to the first second peripheral range A2 is formed over the entire circumferential direction of the first second peripheral range A2. As a result, the second protruding portion 800 (and the second hole 7B accordingly) can be formed at a high density in the circumferential direction.

FIG. 14 is an explanatory view of the moving direction (mold slide direction) of the inner peripheral side mold 70 and the outer peripheral side mold 80 in the mold release step. FIG. 15 is an enlarged view of part Q13 of FIG. In FIG. 14, the moving directions of the respective parts 71, 72, 73, 74 of the inner peripheral side mold 70 are indicated by arrows R71 to R74, and the respective parts 81, 82, 83, 84 of the outer peripheral side mold 80 are shown. Are indicated by arrows R81 to R84.

The mold release step includes a first step (see arrows R71 to R74) in which the divided parts 71, 72, 73, and 74 of the inner peripheral mold 70 move linearly inward in the radial direction, respectively, and the outer peripheral side. Each of the divided parts 81, 82, 83, 84 in the mold 80 includes a second step (see arrows R81 to R84) of linearly moving outward in the radial direction.

For example, in the first step, the portions 71 and 72 are first moved inward in the radial direction sequentially or simultaneously, and then moved in the axial direction. The sites 73, 74 are then moved radially inward sequentially or simultaneously. In the second step, the parts 81, 82, 83, 84 are sequentially or simultaneously moved outward in the radial direction.

The first step may be executed before a part or all of the second step, or may be executed after a part or all of the second step.

In this case, the moving direction of each of the divided portions 71, 72, 73, 74 in the inner peripheral mold 70 (see arrows R71 to R74) and the divided portions 81 in the outer peripheral mold 80, The moving directions (see arrows R81 to R84) at the time of mold release for each of 82, 83, and 84 intersect the axes (see the central axis I in FIG. 14) and form an angle larger than 0 degrees with respect to each other. For example, the moving direction R71 at the time of mold release of the part 71 intersects the axis and forms 180 degrees with respect to the moving direction R72 at the time of releasing the part 72, and becomes the moving direction R73 at the time of releasing the part 73. On the other hand, it is 90 degrees, and it is 90 degrees with respect to the moving direction R74 when the part 74 is released from the mold. Further, the moving direction R71 of the part 71 at the time of demolding is 135 degrees with respect to the moving direction R81 of the part 81 at the time of demolding, and 135 degrees with respect to the moving direction R82 of the part 82 at the time of demolding. The movement direction R83 at the time of mold release of the part 83 is 45 degrees, and the movement direction R84 at the time of mold release of the part 84 is 45 degrees.

In this case, the moving direction (see arrows R71 to R74) at the time of mold release for each of the divided portions 71, 72, 73, 74 in the inner peripheral mold 70 is a predetermined angle around the axis (90 degrees in this example). ) Is a relationship that overlaps with each rotation. Further, the moving direction (see arrows R81 to R84) at the time of mold release for each of the divided portions 81, 82, 83, 84 in the outer peripheral mold 80 is a predetermined angle around the axis (90 degrees in this example). It is a relationship that overlaps with each rotation. Then, the moving direction at the time of mold release (see arrows R71 to R74) for each of the divided portions 71, 72, 73, 74 in the inner peripheral side mold 70 and the divided portions 81, 82 in the outer peripheral side mold 80. , 83, 84 The minimum angle formed between the moving direction at the time of mold release (see arrows R81 to R84) is half of the predetermined angle (45 degrees in this example).

By the way, in the above-mentioned first protruding portion 700 and the second protruding portion 800, the respective parts 71, 72, 73, 74, 81, 82, 83, 84 are separated so that the mold can be easily released in the mold release step. It protrudes in the direction corresponding to the moving direction at the time of molding. Specifically, the first protruding portion 700 formed at the portion 71 protrudes in parallel with the moving direction R71 at the time of mold release of the portion 71, and the first protruding portion 700 formed at the portion 72 is separated from the portion 72. The first protruding portion 700 formed in the portion 73 protruding in parallel with the moving direction R72 at the time of molding protrudes in parallel with the moving direction R73 at the time of releasing the portion 73, and the same applies to the first protruding portion 700 related to the portion 74. Is. Further, the second protruding portion 800 formed at the portion 81 protrudes in parallel with the moving direction R81 at the time of mold release of the portion 81, and the second protruding portion 800 formed at the portion 82 at the time of mold release of the portion 82 The second protruding portion 800 that protrudes in parallel with the moving direction R82 and is formed in the portion 83 protrudes in parallel with the moving direction R83 at the time of mold release of the portion 83, and the same applies to the second protruding portion 800 related to the portion 84.

Further, the cross-sectional area perpendicular to the protruding direction of the first protruding portion 700 and the second protruding portion 800 described above changes along the protruding direction so that the mold can be easily released in the mold release step.

Specifically, the first protruding portion 700 is tapered in such a manner that the cross-sectional area decreases toward the protruding side (outward in the radial direction) in the protruding direction. That is, as schematically shown in FIG. 15, with respect to the portion 74, when viewed in the axial direction, the direction of the outer peripheral surface of the portion 74 (see L74) is relative to the movement direction R74 at the time of mold release of the portion 74. It is slightly inclined so that the inside in the radial direction becomes wider. As a result, the opening area of the first hole 7A decreases toward the outer side in the radial direction.

Further, similarly to the first protruding portion 700, the second protruding portion 800 is tapered in such a manner that the cross-sectional area decreases toward the protruding side (inward in the radial direction) in the protruding direction. That is, as schematically shown in FIG. 15, with respect to the portion 84, when viewed in the axial direction, the direction of the outer peripheral surface of the portion 84 (see L84) is relative to the movement direction R84 at the time of mold release of the portion 84. It is slightly inclined so that the outer side in the radial direction becomes wider. As a result, the opening area of the second hole 7B increases toward the outer side in the radial direction.

In this embodiment, the first hole 7A whose opening area decreases toward the outer side in the radial direction and the second hole 7B whose opening area increases toward the outer side in the radial direction are formed in substantially the same number. Therefore, the cross-sectional areas of the flow paths (cooling water passage 95 and case oil passage 35) formed around the first hole 7A and the second hole 7B are substantially the same on the radial outer side and the radial inner side, and the distribution of the flow passages A good balance can be ensured throughout.

Next, the effect of this embodiment will be further described with reference to FIG.

FIG. 16 is a perspective view schematically showing an inner peripheral side mold 70'according to a comparative example. As shown in FIG. 16, the inner peripheral side mold 70'according to the comparative example is different from the inner peripheral side mold 70 according to the present embodiment in that the number of divisions is larger. Specifically, the inner peripheral side mold 70'is divided into eight, and each portion has a protruding portion corresponding to the first protruding portion 700. Therefore, in the comparative example, the outer peripheral mold (not shown) does not need to have a protruding portion corresponding to the second protruding portion 800, and has an inner peripheral surface having no unevenness. In this case, in the comparative example, the number of divisions of the outer peripheral mold can be two.

In such a comparative example, since the number of divisions of the inner peripheral side mold 70'is relatively large, the number of mold portions for forming the inner peripheral side mold 70'is large. That is, in the comparative example of FIG. 16, eight mold parts are required. The total number of divisions of the inner peripheral side mold 70'and the outer peripheral side mold is 10.

On the other hand, according to the present embodiment, as described above, the number of divisions of the inner peripheral side mold 70 is only four, and the number of divisions of the outer peripheral side mold 80 is four, but a total of eight. Is. Therefore, according to this embodiment, the mold structure for forming the collapsible core 7 can be simplified. Further, since the number of divisions of the inner peripheral side mold 70 is relatively small, the movement (first step) of each part 71, 72, 73, 74 of the inner peripheral side mold 70 at the time of mold release can be efficiently realized. ..

Although each embodiment has been described in detail above, the present invention is not limited to a specific embodiment, and various modifications and changes can be made within the scope of the claims. It is also possible to combine all or a plurality of the components of the above-described embodiment.

<Additional notes>
Regarding the above examples, the following will be further disclosed. Of the effects described below, the effect related to each additional form with respect to one form is an additional effect resulting from each of the additional forms.

(1) One form is a method for manufacturing a collapsible core (7) used for manufacturing a cylindrical member (60) of a rotary electric machine (10).
A step of solidifying the core material between the inner peripheral side mold (70) divided into a plurality of pieces in the circumferential direction and the outer peripheral side mold (80) divided into a plurality of pieces in the circumferential direction.
Including a mold release step of separating the solidified core material from the inner peripheral side mold and the outer peripheral side mold.
The outer peripheral surface of the inner peripheral mold has a plurality of first protruding portions (700) protruding in the radial direction in the first peripheral range (A1) of the entire circumference in the circumferential direction.
The inner peripheral surface of the outer peripheral mold has a plurality of second protruding portions (800) protruding in the radial direction in the second peripheral range (A2) of the entire circumference in the circumferential direction.
The first circumference range and the second circumference range are manufacturing methods in which the phases in the circumferential direction are different.

According to this embodiment, it is possible to provide a manufacturing method suitable for manufacturing the cylindrical member (60) of the rotary electric machine (10). Specifically, since a space is formed around the plurality of first protrusions and around the plurality of second protrusions, the portions corresponding to the plurality of first protrusions and the plurality of first protrusions are holes (diameter direction). It is possible to form a collapsible core that becomes a hole). Then, by utilizing such a collapsing core, a space is formed around the plurality of holes, so that a cylindrical casting having a space around the cylindrical portion formed by the holes can be formed. In this case, the cylindrical casting can be suitably used as a cylindrical member of a rotary electric machine. That is, the space around the plurality of cylindrical portions in the cylindrical casting can be suitably used as a flow path for cooling water and oil. For example, when a cylindrical member is provided around the stator, the stator can be effectively cooled by a refrigerant such as cooling water or oil.

(2) Further, in the present embodiment, preferably, in the mold release step, each of the divided portions (71, 72, 73, 74) in the inner peripheral mold is linearly inward in the radial direction. A step of moving and a step of linearly moving each of the divided parts (81, 82, 83, 84) in the outer peripheral mold to the outside in the radial direction are included.
The first peripheral range is separated in the circumferential direction for each divided portion in the inner peripheral mold, and the second peripheral range is divided in the circumferential direction for each divided portion in the outer peripheral mold. Separated and
The moving direction of each divided portion in the inner peripheral mold (arrows R71 to R74) and the moving direction of each divided portion in the outer peripheral mold (arrows R81 to R84) intersect the axes, respectively. And they make an angle greater than 0 degrees with respect to each other.

In this case, the inner peripheral side mold and the outer peripheral side mold can be separated from each other to efficiently manufacture the collapsible core. For example, the total number of parts that form the inner peripheral side mold and the number of parts that form the outer peripheral side mold, as compared with the case where only the inner peripheral side mold is divided or only the outer peripheral side mold is divided. Can be reduced. Further, the first range or the second range can be set over the entire circumference in the circumferential direction.

(3) Further, in the present embodiment, preferably, the moving directions of the divided portions in the inner peripheral side mold overlap each other at predetermined angles in the circumferential direction.
The moving direction of each of the divided portions in the outer peripheral mold has a relationship of overlapping each of the predetermined angles in the circumferential direction.
The minimum angle formed between the moving direction of each divided portion in the inner peripheral mold and the moving direction of each divided portion in the outer peripheral mold is half of the predetermined angle.

In this case, the first range and the second range can be set alternately and evenly (every half of a predetermined angle) over the entire circumference in the circumferential direction.

(4) Further, in the present embodiment, preferably, the inner peripheral side mold is divided into four, and the four parts form the outer peripheral surface extending 360 degrees as a whole.
The outer peripheral mold is divided into four parts, and the four parts form the inner peripheral surface over 360 degrees as a whole.
The predetermined angle is 90 degrees.
The plurality of first protrusions are arranged over the entire circumferential direction of the first circumferential range in each of the four portions of the inner peripheral mold.
The plurality of second protrusions are arranged over the entire circumferential direction of the second circumferential range in each of the four portions of the outer peripheral mold.
The first lap range and the second lap range are continuously and alternately provided in the circumferential direction.

In this case, the inner peripheral side mold and the outer peripheral side mold can be efficiently realized with an appropriate number of divisions. Further, the first protruding portion and the second protruding portion can be formed at high density in the circumferential direction. The plurality of first protrusions may be uniformly arranged so as to be separated from each other by a predetermined distance, and the plurality of second protrusions may be uniformly arranged so as to be separated from each other by a predetermined distance. May be done.

(5) Further, in the present embodiment, preferably, of the four parts of the inner peripheral side mold, the two parts that move in the directions facing each other have the same configuration.
The four parts of the outer peripheral mold have the same configuration.

In this case, since each of the divided parts can be manufactured in common, the manufacturability of the inner peripheral side mold and the outer peripheral side mold is improved.

(6) Further, in the present embodiment, preferably, the first protruding portion of the divided one portion in the inner peripheral side mold protrudes in parallel with the moving direction of the one portion.
The second protruding portion of the divided one portion of the outer peripheral mold projects parallel to the moving direction of the one portion.

In this case, a plurality of first protrusions can be formed on each of the divided portions of the inner peripheral mold, and a plurality of second protrusions can be formed on each of the divided portions of the outer peripheral mold.

(7) Another form is a collapsible core (7) used for manufacturing the cylindrical member (60) of the rotary electric machine (10).
It has a cylindrical shape, has a plurality of holes (7A, 7B) penetrating in the radial direction, and has a plurality of holes (7A, 7B).
The plurality of holes are a plurality of first holes (7A) formed in the first circumferential range (A1) of the entire circumference in the circumferential direction of the cylindrical form and the entire circumference of the circumferential direction of the cylindrical form. Including a plurality of second holes (7B) formed in the second peripheral range (A2) of the above.
The first circumference range and the second circumference range have different phases in the circumferential direction.
The opening area of the first hole decreases toward the outside in the radial direction, and the opening area decreases.
The second hole is a collapsible core whose opening area increases toward the outer side in the radial direction.

According to this embodiment, the cross-sectional areas of the spaces formed around the first hole and the second hole are substantially the same on the outer side in the radial direction and the inner side in the radial direction, and a good balance can be ensured over the entire distribution of the space. Therefore, when the space is used as a flow path for the refrigerant, a good balance can be ensured with respect to the distribution of the refrigerant over the entire circumferential and radial directions.

7 Collapseable core 7A 1st hole 7B 2nd hole 700 1st protruding part 70 Inner peripheral side mold 71-74 Part 80 Outer peripheral side mold 81-84 Part 800 2nd protruding part 10 Motor 10b Stator 22A Back yoke 22B Teeth 35 Case oil channel 95 Cooling channel 112 Stator core 114 Stator coil 330 Inlet oil channel 331 Inlet oil channel 351 First oil channel 352 Second oil channel 795A Core 7951 Cylindrical section 942 Inlet channel 942A Column section 944 Outlet channel 944A Cylindrical section Part 957A Groove part 1351 Cylindrical part 1951 Cylindrical part 1951A Hole A1 First circumference range A2 Second circumference range

Claims (6)

A method for manufacturing a collapsible core used for manufacturing a cylindrical member of a rotary electric machine.
A step of solidifying the core material between the inner peripheral mold divided into a plurality of molds in the circumferential direction and the outer peripheral mold divided into a plurality of molds in the circumferential direction.
Including a mold release step of separating the solidified core material from the inner peripheral side mold and the outer peripheral side mold.
The outer peripheral surface of the inner peripheral mold has a plurality of first projecting portions projecting in the radial direction in the first peripheral range of the entire circumference in the circumferential direction.
The inner peripheral surface of the outer peripheral mold has a plurality of second protrusions protruding in the radial direction in the second peripheral range of the entire circumference in the circumferential direction.
A manufacturing method in which the first peripheral range and the second peripheral range are different in phase in the circumferential direction. In the mold release step, each of the divided parts in the inner peripheral mold moves linearly inward in the radial direction, and each of the divided parts in the outer peripheral mold moves radially inward. Including the process of moving linearly
The first peripheral range is separated in the circumferential direction for each divided portion of the inner peripheral mold, and the second peripheral range is divided for each divided portion of the outer peripheral mold. Separated by direction,
The moving direction of each divided part in the inner peripheral mold and the moving direction of each divided part in the outer peripheral mold intersect with each other and have an angle larger than 0 degrees with respect to each other. The manufacturing method according to claim 1. The moving directions of the divided parts in the inner peripheral mold have a relationship of overlapping each predetermined angle in the circumferential direction.
The moving direction of each of the divided portions in the outer peripheral mold has a relationship of overlapping each of the predetermined angles in the circumferential direction.
The minimum angle formed between the moving direction of each divided portion in the inner peripheral mold and the moving direction of each divided portion in the outer peripheral mold is half of the predetermined angle. The manufacturing method according to claim 2. The inner peripheral mold is divided into four parts, and the four parts form the outer peripheral surface over 360 degrees as a whole.
The outer peripheral mold is divided into four parts, and the four parts form the inner peripheral surface over 360 degrees as a whole.
The predetermined angle is 90 degrees.
The plurality of first protrusions are arranged over the entire circumferential direction of the first circumferential range in each of the four portions of the inner peripheral mold.
The plurality of second protrusions are arranged over the entire circumferential direction of the second circumferential range in each of the four portions of the outer peripheral mold.
The manufacturing method according to claim 3, wherein the first lap range and the second lap range are continuously and alternately provided in the circumferential direction. Of the four parts of the inner peripheral mold, the two parts that move in the directions facing each other have the same configuration.
The manufacturing method according to claim 4, wherein the four parts of the outer peripheral mold have the same configuration. The first protruding portion of the divided one portion in the inner peripheral side mold projects parallel to the moving direction of the one portion.
The production according to any one of claims 2 to 5, wherein the second protruding portion of the divided one portion in the outer peripheral mold protrudes in parallel with the moving direction of the one portion. Method.

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