Stator and method for manufacturing a stator

Abstract

To provide a stator of which the cooling performance is improved, and a manufacturing method of the stator.SOLUTION: There are provided a stator of which the cooling performance is improved, and a manufacturing method of the stator. The stator comprises a stator core and a resin member which is provided in the stator core. The resin member includes: a filling part for filling a slot opening, which is formed between two teeth adjacent in a circumferential direction, the filling part extending in an axial direction; and a lid part including a lid main body part which is connected to one end of the filling part in the axial direction, the lid main body part extending in the circumferential direction so as to cover the coil end closer to one side in the axial direction than the stator core. The lid main body part includes an inner peripheral surface, an outer peripheral surface, and at least one radial opening portion connecting an inner opening formed on the inner peripheral surface and an outer opening formed on the outer peripheral surface in a radial direction.SELECTED DRAWING: Figure 3A

Description

Technical Field

[0001] The present disclosure relates to a stator and a method for manufacturing a stator.

Background Art

[0002] Conventionally, a magnetic gear electric machine configured to transmit magnetic torque is known. For example, the magnetic gear electric machine disclosed in Patent Document 1 includes, in order from the radially inner side, an inner rotor that supports a plurality of permanent magnets, a pole piece rotor that includes a plurality of pole pieces, and a stator. The stator includes a stator core, a stator coil provided on the stator core, and a plurality of stator magnets provided on the inner peripheral surface side of the stator core.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, since the temperature of the stator rises due to copper loss of the stator coil or the like, cooling design of the stator is desired. However, Patent Document 1 does not disclose a specific configuration.

[0005] An object of the present disclosure is to provide a stator with improved cooling performance and a method for manufacturing the stator.

Means for Solving the Problems

[0006] The stator according to at least one embodiment of the present disclosure is a stator core extending in the circumferential direction with respect to the axis, a plurality of teeth protruding from one side in the radial direction from the stator core, the plurality of teeth being arranged at intervals in the circumferential direction, A plurality of stator coils wound around the plurality of teeth, each including a coil end located on one side in the axial direction from the stator core, A resin member provided on the stator core, Equipped with, The aforementioned resin member is A filling portion for filling a slot opening formed between two teeth adjacent to each other in the circumferential direction, comprising a filling portion extending in the axial direction, A lid body portion connected to one end of the filling portion in the axial direction, the lid body portion having a lid body portion that extends in the circumferential direction so as to cover the coil end on one side in the axial direction from the stator core, Includes, The lid body portion is, inner surface and Outer surface and, At least one radially opening that connects the inner opening formed on the inner circumferential surface and the outer opening formed on the outer circumferential surface in the radial direction, It has.

[0007] A method for manufacturing a stator according to one embodiment of the present disclosure is: The above method for manufacturing a stator, The steps include: arranging a mold to cover the plurality of coil ends arranged in the circumferential direction, and arranging at least one core for forming the at least one radially open portion within the space covered by the mold, on one side in the axial direction of the stator core; The steps include pouring liquid resin for forming the resin member into the space covered by the mold and filling the slot opening with the liquid resin, The steps include drying and curing the aforementioned resin, The steps include removing the mold and the at least one core, It is equipped with. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a stator with improved cooling performance and a method for manufacturing the stator.

Brief Description of the Drawings

[0009] [Figure 1A] Schematic diagram of a magnetic gear electric machine (magnetic gear generator) according to an embodiment. [Figure 1B] Schematic diagram of a magnetic gear electric machine (magnetic gear motor) according to another embodiment. [Figure 2] Schematic diagram showing the internal structure of a magnetic gear electric machine according to an embodiment. [Figure 3A] Schematic diagram of a resin member according to an embodiment. [Figure 3B] Schematic diagram of a resin member according to another embodiment. [Figure 4A] Another schematic diagram of a resin member according to an embodiment. [Figure 4B] Another schematic diagram of a resin member according to another embodiment. [Figure 5] Flowchart showing a method for manufacturing a stator according to an embodiment. [Figure 6] Schematic diagram showing a stator core before the start of a method for manufacturing a stator. [Figure 7] Schematic diagram showing the arrangement of a mold release member in a method for manufacturing a stator according to an embodiment. [Figure 8] Schematic diagram showing a molding die and at least one core according to an embodiment. [Figure 9] Schematic diagram showing a completed stator. [Figure 10] Flowchart showing a method for manufacturing a stator according to another embodiment. [Figure 11] Schematic diagram showing the arrangement of a plurality of stator magnets in a method for manufacturing a stator according to another embodiment. [Figure 12] Schematic diagram showing the arrangement of a plurality of auxiliary magnets in a method for manufacturing a stator according to another embodiment.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, several embodiments of this disclosure will be described with reference to the attached drawings. However, the dimensions, materials, shapes, relative arrangements, etc., of the components described or shown in the drawings as embodiments are not intended to limit the scope of this disclosure, but are merely illustrative examples. For example, expressions describing relative or absolute arrangements such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" should not only strictly describe such arrangements, but also describe states of relative displacement with tolerances or angles or distances that allow for the same function to be achieved. For example, expressions such as "identical," "equal," and "homogeneous" that describe things being in an equal state not only describe a state of being strictly equal, but also describe a state in which there is a tolerance or a difference that is sufficient to achieve the same function. For example, expressions describing shapes such as squares or cylinders shall not only represent geometrically precise shapes such as squares or cylinders, but also shapes that include protrusions, chamfers, etc., to the extent that the same effect can be achieved. On the other hand, expressions such as "possessing," "including," or "having" one component are not exclusive expressions that exclude the existence of other components. Note that similar configurations may be denoted by the same reference numerals and their explanations may be omitted.

[0011] <1. Overview of Magnetic Geared Electric Machine 1> Figures 1A and 1B are schematic diagrams of magnetic geared electric machines 1A, 1B(1) according to several embodiments of the present disclosure. In the following description, "axial direction" is the direction parallel to the axis of the stator 20 incorporated in the magnetic geared electric machine 1, "radial direction" is the radial direction with respect to the axis of the stator 20, and "circumferential direction" is the circumferential direction with respect to the axis of the stator 20. The magnetic geared electric machine 1 is equipped with a rotating shaft 5 for transmitting power to an external rotating device 7 described later, and the axis of the rotating shaft 5 coincides with the axis of the stator 20. The rotating shaft 5 is rotatably supported by a housing 98. The magnetic geared electric machine 1 is also connected to a power transmission shaft 8 of the external rotating device 7. The rotating shaft 5 may be solid as illustrated in Figures 1A and 1B, or it may be cylindrical (not shown) that houses the power transmission shaft 8.

[0012] The magnetic geared electromachine 1 illustrated in Figures 1A and 1B comprises a magnetic rotor 10 and a stator 20. The magnetic rotor 10 and stator 20 are housed in a housing 98. The magnetic rotor 10 includes a plurality of rotor magnets 19 arranged in the circumferential direction and a rotor core 15 that supports the plurality of rotor magnets 19. The rotor core 15 is connected to a rotating shaft 5. In the figures, a surface permanent magnet (SPM) configuration is employed in which the plurality of rotor magnets 19 are provided on the surface of the rotor core 15, but the disclosure is not limited thereto. For example, an interior permanent magnet (IPM) configuration may be employed in which the plurality of rotor magnets 19 are arranged inside the rotor core 15 (see Figure 2).

[0013] The stator 20, fixed to the housing 98, includes a plurality of stator magnets 29 arranged in the circumferential direction, a stator core 25 supporting the plurality of stator magnets 29, a thermosetting resin member 60 provided on the stator core 25, and a plurality of stator coils 27 embedded in the resin member 60. The resin member 60 has the function of improving the cooling performance of the stator 20 (details will be described later). The stator coils 27, which are wound around the stator core 25 and embedded in the resin member 60, have a coil end 21 located on one side in the axial direction relative to the stator core 25 and another coil end 22 located on the other side. In the stator 20 shown in the figure, an SPM type configuration is adopted in which the plurality of stator magnets 29 are provided on the surface of the stator core 25, but this disclosure is not limited thereto, and an IPM type configuration may also be adopted.

[0014] The magnetic geared electric machine 1 shown in Figures 1A and 1B further comprises a pole piece rotor 30 housed in a housing 98. The pole piece rotor 30 includes a plurality of pole pieces 55 arranged in the circumferential direction, and a pair of flanges 34 positioned on both sides of the pole pieces 55 in the axial direction. The pole pieces 55 illustrated in the figures are positioned radially inward from the stator 20 and radially outward from the magnet rotor 10. The flange 34 located on one side of the pole pieces 55 in the axial direction is connected to the rotating shaft 5 via a bearing, and the flange 34 located on the other side is connected to the power transmission shaft 8. This allows the pole piece rotor 30 to rotate integrally with the power transmission shaft 8 and to rotate relative to the rotating shaft 5.

[0015] The magnetic geared electric machine 1A(1) illustrated in Figure 1A is a magnetic geared generator configured to generate electricity by being driven by an input from a prime mover 7A, which is an example of an external rotating device 7. The stator coil 27 shown in the figure is electrically connected to a power supply destination 4, which may be a power system. The principle by which the magnetic geared electric machine 1A generates electricity as a magnetic geared generator is as follows: When the prime mover 7A rotates the power transmission shaft 8, the magnetic pole piece rotor 30 rotates. The relative positional relationship of the multiple magnetic pole pieces 55 with respect to the multiple rotor magnets 19 and multiple stator magnets 29 changes, modulating the magnetic flux between the magnetic rotor 10 and the stator 20, and the rotor magnets 19 receive a magnetic force from the modulated magnetic field, causing the magnetic rotor 10 to rotate. At this time, an electric current is generated in the stator coil 27 by electromagnetic induction that occurs with the rotation of the magnetic pole piece rotor 30 and the magnetic rotor 10, and the magnetic geared electric machine 1A as a magnetic geared generator can supply power to the power supply destination 4.

[0016] The magnetic geared electric machine 1B(1) illustrated in Figure 1B is a magnetic geared motor configured to drive a rotating machine 7B, which is an example of an external rotating device 7, by receiving power P from a power supply source 6, which may be a power grid, for example. The rotating machine 7B may be an electric vehicle, in which case the power transmission shaft 8 of the rotating machine 7B is the drive shaft of the electric vehicle. The principle by which the magnetic geared electric machine 1B, as a magnetic geared motor, drives the rotating machine 7B is as follows: The rotating magnetic field generated by energizing the stator coil 27 causes the magnetic rotor 10 to rotate. The relative positional relationship of the multiple magnetic pole pieces 55 with respect to the multiple rotor magnets 19 and the multiple stator magnets 29 changes, modulating the magnetic flux between the magnetic rotor 10 and the stator 20, causing the magnetic pole piece rotor 30 to rotate and outputting torque to the power transmission shaft 8. In this way, the magnetic geared electric machine 1B, as a magnetic geared motor, drives the rotating machine 7B.

[0017] In the magnetic geared electric machines 1A and 1B(1) shown in Figures 1A and 1B, if the number of magnetic poles of the magnetic pole pieces 55 of the magnetic pole piece rotor 30 is NL, the number of pole pairs in the rotor magnet 19 of the magnet rotor 10 is NH, and the number of pole pairs in the stator magnet 29 of the stator 20 is NS, then the relationship NL = NH + NS holds. When this relationship holds, the ratio of the rotational speed of the magnet rotor 10 to that of the magnetic pole piece rotor 30 is expressed as NL / NH. In this example, NL / NH is greater than 1, so the magnet rotor 10 functions as a high-speed rotor and the magnetic pole piece rotor 30 functions as a low-speed rotor. Note that the number of magnetic poles NL of the magnetic pole piece 55 is less than the number of pole pairs NS of the stator magnet 29.

[0018] In the examples shown in Figures 1A and 1B, the stator 20, pole pieces 55, and rotor magnet 19 are arranged in that order from the radially outer side, but the disclosure is not limited to this. For example, a configuration in which the rotor magnet 19, pole pieces 55, and stator 20 are arranged in that order from the radially outer side may be adopted.

[0019] <2. Overview of the internal structure of the magnetic geared electromachine 1> Figure 2 is a schematic diagram showing the internal structure of a magnetic geared electric machine 1 according to one embodiment of the present disclosure. The pole rotor 30 includes an annular unit 50 that extends in the circumferential direction. The annular unit 50 faces the stator 20 with an outer air gap G1 and faces the magnet rotor 10 with an inner air gap G2. The annular unit 50 has a plurality of pole pieces 55 and a plurality of non-magnetic materials 52, and each pole piece 55 and each non-magnetic material 52 extends in the axial direction. The plurality of pole pieces 55 and the plurality of non-magnetic materials 52 are arranged alternately in the circumferential direction. In this example, each pole piece 55 is formed from a plurality of electromagnetic steel sheets stacked in the axial direction, but the present disclosure is not limited thereto. For example, at least a portion of each pole piece 55 may be formed from a compacted magnetic core. The pair of flanges 34 described above (see Figures 1A and 1B) are directly or indirectly connected to both axial ends of the annular unit 50, respectively.

[0020] Although not an essential component of this disclosure, part or all of the outer circumferential surface of the annular unit 50 may be covered by a cover (not shown). Similarly, part or all of the inner circumferential surface of the annular unit 50 may also be covered by a cover (not shown). The material forming the cover is preferably a non-magnetic material, and more preferably a non-magnetic and non-conductive material.

[0021] Furthermore, although not an essential component of this disclosure, at least one of the pole pieces 55 may include an axially open pole piece ventilation passage 56. Air flows axially through the pole piece ventilation passage 56. In this case, it is preferable that each of the pair of flanges 34 is provided with a ventilation hole communicating with the pole piece ventilation passage 56.

[0022] Although detailed illustrations are omitted, at least one of the multiple non-magnetic materials 52 may include a non-magnetic ventilation passage that is open in the axial direction, and air may flow in the axial direction through this non-magnetic ventilation passage. In this case, it is preferable that ventilation holes communicating with the non-magnetic ventilation passage in the axial direction are provided in each of the pair of flanges 34.

[0023] <3. Details of the configuration of the stator 20 according to one embodiment> As illustrated in Figure 2, the stator core 25, a component of the stator 20, extends circumferentially with respect to its axis. Furthermore, the stator 20 includes a plurality of teeth 28 projecting radially from the stator core 25 to one side (radially inward in the example of Figure 2). The plurality of teeth 28 are spaced apart in the circumferential direction. Each tooth 28 extending axially has a projection 281 projecting radially from the stator core 25 to one side, and a tip 282 provided at one end of the projection 281. In the circumferential direction, the tip 282 is longer than the projection 281. The space between two circumferentially adjacent teeth 28 is a slot opening 9. The stator coil 27 is wound around each projection 281 of the plurality of teeth 28, and a portion of the stator coil 27 is located in the slot opening 9.

[0024] The stator 20 further includes fingers 23 arranged at circumferential intervals. The fingers 23 project radially from the tip 282 to one side and extend axially. Each of the plurality of stator magnets 29 has an axially extending shape. Each stator magnet 29 is sandwiched between two circumferentially adjacent fingers 23. In other words, the plurality of stator magnets 29 are arranged circumferentially on one radial side of the stator core 25. Although the fingers 23 illustrated in Figure 2 are formed integrally with the tip 282, the disclosure is not limited thereto. For example, at least one of the plurality of fingers 23 may be formed separately from the tip 282.

[0025] As described above, the magnetic geared electric machine 1 may have a configuration in which the rotor magnet 19, the pole piece 55, and the stator 20 are arranged in order from the radially outer side. In this case, "one side in the radial direction" is the radially outer side. In the following description, we will mainly describe a configuration in which one side in the radial direction is the radially inner side.

[0026] <4. Composition of resin component 60> Refer to Figures 1A to 4B to illustrate the details of the configuration of the resin member 60. Figures 3A and 3B are schematic perspective views showing resin members 60A, 60B(60) according to one embodiment of the present disclosure. The resin members 60A, 60B(60) include lid portions 70A, 70B(70). The lid body portions 75A, 75B(75), which are components of the lid portions 70A, 70B(70), extend circumferentially to cover the coil end 21 (see Figures 1A and 1B) on one axial side of the stator core 25. The lid body portion 75 faces the stator core 25 in the axial direction along the entire circumferential length of the stator core 25. The coil end 21 is embedded inside the lid body portion 75 (see Figures 1A and 1B). As a more detailed example, each stator coil 27 has a single coil wire wound around a tooth 28, and this coil wire has multiple curved sections that constitute the bent portion 21A (see Figure 4A) of the coil end 21. Each of these multiple curved sections is embedded in the lid body 75.

[0027] Furthermore, as illustrated in Figures 1A and 1B, the resin member 60 includes a filling portion 65 that fills the slot openings 9 (see Figure 2). The filling portion 65 extends axially, and one end of the filling portion 65, which is one end in the axial direction, is connected to the lid body portion 75 described above. The filling portion 65 is integrally formed with the lid portion 70. As shown in Figure 2, in this example, multiple filling portions 65 each fill multiple slot openings 9. Stator coils 27 are embedded inside the filling portions 65. As a more detailed example, each coil wire constituting each stator coil 27 has multiple axially extending portions that extend along the teeth 28 (i.e., axially extending), and each of these multiple axially extending portions is embedded in the filling portion 65. With the above structure, the resin member 60 can be in close contact with at least a portion of the stator coils 27.

[0028] As illustrated in Figures 1A and 1B, the resin member 60 according to one embodiment of the present disclosure further includes a separate lid portion 170 located on the opposite side of the lid portion 70, with the filling portion 65 in between. The separate lid portion 170 extends circumferentially to cover a separate coil end 22 of the stator coil 27, located on the other axial side of the stator core 25. The other end of each filling portion 65, which is the other axial end, is connected to the separate lid portion 170. The separate lid portion 170 in this example, which is integrally formed with each filling portion 65, has a shape that is axially symmetrical with the lid portion 70. For the sake of simplicity, the lid portion 70 will be described in detail below, and some or all of the details of the separate lid portion 170 will be omitted (the separate lid portion 170 is not shown in Figures 3A and 3B).

[0029] As illustrated in Figures 3A and 3B, the lid body portions 75A and 75B (75) of the lid portions 70A and 70B (70) have an inner circumferential surface 78, an outer circumferential surface 79, and at least one radial opening 80. The radial opening 80 connects (in other words, makes radial communication between) an inner opening 88 formed on the inner circumferential surface 78 and an outer opening 89 formed on the outer circumferential surface 79 in the radial direction. When the magnetic geared electric machine 1 is in operation, air can flow inside the radial opening 80.

[0030] According to the above configuration, even if the stator coil 27 generates heat when power is applied, the heat generated in the stator coil 27 is transferred to the lid body 75 via the filling section 65, or directly to the lid body 75. The heat is then released from the lid 70. Since the lid body 75 of the lid 70 has at least one radially open section 80, the surface area of ​​the lid body 75 exposed to the surrounding air is increased. Therefore, the heat dissipation of the lid 70 is improved, resulting in a stator 20 with improved cooling performance.

[0031] Furthermore, the glass transition temperature of the thermoplastic resin member 60 according to one embodiment of this disclosure is 130°C or higher. With the above configuration, the resin member 60 can sufficiently withstand the heat generated by the stator coil 27, thereby improving the heat resistance of the stator 20.

[0032] Furthermore, as previously described, the stator 20 (see Figure 2) according to one embodiment of the present disclosure includes a plurality of stator magnets 29 arranged circumferentially on one radial side (the radially inner side in the example of Figure 2) of the stator core 25. With the above configuration, even if the temperature of the stator core 25 rises due to the heat generated by the stator magnets 29, the heat generated in the stator core 25 can be released from the lid portion 70 of the resin member 60. Therefore, even when the stator 20 is applied to the magnetic geared electric machine 1, the cooling performance of the stator 20 can be fully utilized, and the magnetic geared electric machine 1 can operate normally.

[0033] As illustrated in Figures 3A and 3B, at least one radial opening 80 has a first radial opening 81. The first radial opening 81 is formed at the other axial end 751 of the lid body 75. In other words, the first radial opening 81 is open not only radially but also to the other axial side. Furthermore, the first radial opening 81 is positioned to face one of the teeth 28 in the axial direction. A portion of the first radial opening 81 is located in the inner space E defined by the bent portion 21A of the coil end 21 (see Figures 4A and 4B). In other words, a portion of the first radial opening 81 is located inside the bent portion 21A. Therefore, the inner opening 881, which is the inner opening 88 of the first radial opening 81, and the outer opening 891, which is the outer opening 89 of the first radial opening 81, are located on both sides of the coil end 21 in the radial direction (see Figures 3A and 3B). In one embodiment of the present disclosure, a plurality of first radial openings 81 are provided corresponding to a plurality of coil ends 21. That is, the plurality of first radial openings 81 are arranged at equal intervals in the circumferential direction. However, the present disclosure is not limited thereto, and the number of first radial openings 81 may be one or more. For example, at least one first radial opening 81 may be provided corresponding to at least one specific coil end 21 where temperature rise is a concern.

[0034] According to the above configuration, since the first radial opening 81 is located in the inner space E of the coil end 21, the distance between the coil end 21 and the first radial opening 81 can be reduced. A configuration is realized in which the heat generated in the coil end 21 is easily transferred to the first radial opening 81, so the cooling performance of the stator 20 is further improved.

[0035] As illustrated in Figures 3A and 3B, at least one radial opening 80 has a second radial opening 82. The second radial opening 82 is located between two circumferentially adjacent coil ends 21 (see Figures 4A and 4B). Thus, both the inner opening 882, which is the inner opening 88 of the second radial opening 82, and the outer opening 892, which is the outer opening 89 of the second radial opening 82, are located between two adjacent coil ends 21. The second radial opening 82 is formed, for example, at one end 752 in the axial direction of the lid body 75. In addition, the second radial opening 82 in one embodiment of the present disclosure is arranged between any two circumferentially adjacent coil ends 21. That is, a plurality of second radial openings 82 are arranged at equal intervals in the circumferential direction. However, the present disclosure is not limited thereto, and the number of second radial openings 82 may be one or more. For example, a second radial opening 82 may be provided only between a specific coil end 21 where temperature rise is a concern and an adjacent coil end 21.

[0036] With the above configuration, the second radial opening 82 is located between two circumferentially adjacent coil ends 21, so the distance between the coil ends 21 and the second radial opening 82 can be reduced. This configuration makes it easier for the heat generated at the coil ends 21 to be transferred to the second radial opening 82, thus further improving the cooling performance of the stator 20.

[0037] As illustrated in Figures 4A and 4B, the second radial opening 82 is configured such that its circumferential length decreases as it moves from one side to the other in the axial direction. The other end 85 of the second radial opening 82 is located further to the other than the end 24 on one side of the coil end 21. In this example, the end 85 of the second radial opening 82 is also located further to the other than the axial end 83 on one side of the first radial opening 81. The end 24 of the coil end 21 coincides with the end on one side of the bent portion 21A. With the above configuration, at least a portion of the second radial opening 82 is arranged to be aligned with the coil end 21 in the circumferential direction, so the distance between the coil end 21 and the second radial opening 82 can be reduced. A configuration is achieved in which heat generated in the coil end 21 is easily transferred to the second radial opening 82, so the cooling performance of the stator 20 is further improved.

[0038] As illustrated in Figures 4A and 4B, the first radial opening 81 and the second radial opening 82 are offset from each other in the circumferential direction. In the example shown in the figures, multiple first radial openings 81 and multiple second radial openings 82 are arranged alternately in the circumferential direction. If the first radial openings 81 and the second radial openings 82 are aligned in the circumferential direction, it is necessary to ensure the axial length of the portion of the lid body 75 between the first radial openings 81 and the second radial openings 82, which may result in the lid body 75 becoming axially elongated. In this respect, with the above configuration, the first radial openings 81 and the second radial openings 82 are offset from each other in the circumferential direction, which shortens the axial length of the lid body 75 and makes the lid body 75 more compact.

[0039] The lid portion 70A illustrated in Figure 3A consists of a lid body portion 75A. The second radial opening portion 82 illustrated in the same figure is open to one side at the end portion 752 on one axial side of the lid body portion 75. With the above configuration, the second radial opening portion 82 is not only open radially but also to one axial side, so that stagnation of airflow in the second radial opening portion 82 can be suppressed. A structure is realized that promotes heat exchange between the second radial opening portion 82 and the air, so the cooling performance of the stator 20 is further improved.

[0040] The lid body portion 75A of the lid portion 70A illustrated in Figure 3A includes a one-side end face 755, which is an end face on one side in the axial direction. In this example, the one-side end face 755 is a plane perpendicular to the axial direction and extends in the circumferential direction. Furthermore, the lid body portion 75A has at least one of the following: an inner tapered surface 758 connecting the one-side end face 755 and the inner circumferential surface 78, or an outer tapered surface 759 connecting the one-side end face 755 and the outer circumferential surface 79. The lid body portion 75A in the figure has both the inner tapered surface 758 and the outer tapered surface 759, but the disclosure is not limited thereto. That is, the lid body portion 75A may have either the inner tapered surface 758 or the outer tapered surface 759, but may not have the other. With the above configuration, by providing at least one of the inner tapered surface 758 or the outer tapered surface 759, the lid body 75A can be closer to the coil end 21 compared to the case where the lid body 75A has a shape that is not chamfered. Since a configuration is realized in which the heat generated at the coil end 21 is easily transferred to the lid body 75A, the cooling performance of the stator 20 is further improved.

[0041] The lid portion 70B illustrated in Figure 3B further comprises the lid body portion 75B described above and a ring portion 72 connected to the end portion 752 of the lid body portion 75B. The ring portion 72 is connected to the end portion 752 along the entire circumferential length of the lid body portion 75B. The second radial opening portion 82 illustrated in Figure 3B is formed between the lid body portion 75B and the ring portion 72. This second radial opening portion 82 is closed from one side in the axial direction by the ring portion 72 and is open only in the radial direction.

[0042] With the above configuration, the axial length of the lid portion 70B is increased by the provision of the ring portion 72, so the surface area of ​​the lid portion 70B exposed to the surrounding air is increased. Therefore, the cooling performance of the stator 20 is further improved. Also, in the process of molding the resin member 60 (details will be described later), a core 90 (see Figure 8), which will be described later, is placed where the second radial opening portion 82 is formed, so the liquid resin for forming the resin member 60 tends to flow poorly. In this respect, with the above configuration, a flow path for the liquid resin for forming the circumferentially extending ring portion 72 is provided during the molding process, so it is possible to suppress the stagnation of the liquid resin flow near where the second radial opening portion 82 is formed.

[0043] Furthermore, the resin material constituting the resin member 60B(60) may contain a ceramic filler. This improves the thermal conductivity of the resin member 60B and mitigates thermal shrinkage due to temperature changes. When a ceramic filler is included, the viscosity of the liquid resin used in the molding process of the resin member 60 increases, and the liquid resin tends to have difficulty flowing inside the molding die 100 (see Figure 8). In this respect, with the resin member 60B provided with a ring portion 72, the flow path for forming the ring portion 72 functions as a flow path that facilitates the flow of the liquid resin, thus simplifying the molding process of the resin member 60B. Note that the resin material constituting the resin member 60A(60) without a ring portion 72 may also contain a ceramic filler. By adjusting various conditions in the molding process of the resin member 60A, such as the filling pressure used when filling the molding die 100 with liquid resin, it is possible to fill the inside of the molding die 100 with liquid resin containing a ceramic filler.

[0044] <5. Supplementary information on status 20> The stator 20 incorporated into the magnetic geared electromachine 1 comprises a plurality of stator magnets 29, but the disclosure is not limited thereto. For example, the stator 20 may be incorporated into a motor that does not have a magnetic pole rotor 30, such as a stepping motor or a DC motor. Even in this case, a stator 20 with improved cooling performance can be realized for the reasons described above.

[0045] <6. Method for manufacturing the stator 20 according to one embodiment> A method for manufacturing a stator 20 according to one embodiment will be described with reference to Figures 5 to 9. Before starting the manufacturing method described below, a plurality of stator coils 27 are already provided on the stator core 25 (see Figure 6). In addition, the following description will illustrate a method for manufacturing a stator 20 equipped with a resin member 60B (see Figure 3B).

[0046] First, as shown in Figure 5, the step of placing the release member 45 is performed (S10). The release member 45 has the same shape as the stator magnet 29. The details of S10 are as follows as an example. As shown in Figures 6 and 7, the release member 45 is inserted between two circumferentially adjacent fingers 23 (Figure 6 shows the state before insertion of the release member 45, and Figure 7 shows the state after insertion). As a result, the space between the two circumferentially adjacent fingers 23 is filled by the release member 45 that extends in the axial direction. The material forming the release member 45 is a material with excellent release properties, such as silicone or polytetrafluoroethylene.

[0047] Next, as shown in Figure 5, the step of arranging a molding die 100 for shaping the resin member 60B using liquid resin and at least one core 90 for forming at least one radially open portion 80 is performed (S12). The liquid resin is the material for forming the resin member 60. The details of S12 are as follows as an example.

[0048] As shown in Figure 8, the molding die 100 comprises a first mold 101 positioned to cover a plurality of coil ends 21 arranged in the circumferential direction, a second mold 102 positioned to cover a plurality of other coil ends 22 arranged in the circumferential direction, and a cylindrical third mold 103 (see Figure 7) positioned to cover a plurality of fingers 23 and a plurality of release members 45 from the radially inner side. The first mold 101 has a first groove 183 that has a shape for molding the lid portion 70B (70), and the second mold 102 has a second groove 184 that has a shape for molding another lid portion 170. The first groove 183 is located on one side in the axial direction from the stator core 25, and the second groove 184 is located on the other side in the axial direction from the stator 20. Both the first groove 183 and the second groove 184 extend in the circumferential direction. Furthermore, the space covered by the first mold 101 and the space covered by the second mold 102 are in communication with each of the multiple slot openings 9.

[0049] The detailed explanation of S12 continues. At least one core 90 is placed in the space covered by the first mold 101, and in a more detailed example, it is placed in the inner space of the first groove 183. At least one core 90 includes a first core 91 for forming a first radial opening 81 and a second core 92 for forming a second radial opening 82. The first core 91 is placed in the inner space E defined by the bent portion 21A of the coil end 21. The second core 92 is placed between two circumferentially adjacent coil ends 21. The first core 91 and the second core 92 are preferably made of a material with excellent release properties, such as silicone or polytetrafluoroethylene. The above-mentioned core 90 is also placed in the space covered by the second mold 102. That is, the above-mentioned core 90 is also placed in the inner space of the second groove 184. This placement method is the same as the method for placing the core 90 in the first groove 183, so a detailed explanation is omitted.

[0050] In step S12, a tool (not shown) is used to maintain the state in which the first mold 101 and the second mold 102 are pressed against the stator core 25. This prevents the first mold 101 and the second mold 102 from separating from the stator core 25 while the liquid resin described later is being filled in.

[0051] Next, as shown in Figure 5, a step is performed in which liquid thermosetting resin is poured into the inner space covered by the molding die 100 and the slot openings 9 are filled with the resin (S14). For example, as shown in Figure 8, the stator core 25 is positioned so that the axial direction of the stator 20 is vertical. Then, liquid resin is poured into the inner space of the first mold 101 located below the stator core 25 (arrow Q). As a result, the liquid resin spreads throughout the inner space of the first groove 183, the multiple slot openings 9, and the inner space of the second groove 184. The multiple stator coils 27 are also immersed in the liquid resin. The first groove 183 includes a circumferentially extending portion for shaping the ring portion 72 (see Figure 3B), and the liquid resin flows through this portion. This prevents the flow of liquid resin from becoming stagnant due to the placement of the second core 92.

[0052] Before pouring the liquid resin, the space covered by the first mold 101, the multiple slot openings 9, and the space covered by the second mold 102 may be evacuated, for example, using a vacuum pump. However, vacuuming is not an essential step of this disclosure. S14 can be performed without vacuuming if the filling pressure for pouring the liquid resin into the first mold 101 is increased.

[0053] Next, as shown in Figure 5, a step of drying and curing the liquid resin is performed (S16). For example, the temperature of the liquid resin is raised to a specified temperature by heating the molding die 100. This dries and cures the liquid resin, forming the resin member 60B. Next, a step of removing the molding die 100 and the core 90 is performed (S18), and a step of removing the release agent 45 is performed (S20). Since the core 90 and the release agent 45 each have release properties, the core 90 is easily detached from the resin member 60B, and the release agent 45 is easily detached from the fingers 23. Next, a step of placing the stator magnet 29 between two adjacent fingers 23 is performed (S22). After S22 is performed, the stator 20 with the resin member 60B is completed, as shown in Figure 9.

[0054] According to the above manufacturing method, a resin member 60 including at least one radially open portion 80 can be formed, and for the reasons described above, a method for manufacturing a stator 20 with improved cooling performance is realized. Furthermore, since at least one core 90 includes a first core 91 and a second core 92, a first radial opening 81 and a second radial opening 82 can be formed. Therefore, for the reasons described above, a method for manufacturing a stator 20 with improved cooling performance is realized. Furthermore, during the step of filling with liquid resin (S14), the stator core 25 is positioned so that its axial direction is vertical. This allows the liquid resin to flow vertically through the slot opening 9 from bottom to top, making it easier to fill the slot opening 9 with liquid resin. Furthermore, since the release agent 45 is placed before the step of filling with liquid resin (S10), it is possible to suppress the resin from getting between two circumferentially adjacent fingers 23 when S14 is performed. In addition, since the liquid resin is dried and cured before the step of placing the stator magnet 29 (S16), it is possible to suppress the transfer of heat generated during the performance of S16 to the stator magnet 29. Thus, demagnetization of the stator magnet 29 due to temperature rise can be avoided.

[0055] The method for manufacturing the stator 20 described herein is not limited to the above embodiments. When a stator 20 is manufactured that includes a resin member 60A instead of a resin member 60B, the core 90 does not need to include a second core 92. Also, the number of cores 90 is not limited to multiple cores. The number of cores 90 is the same as the number of radial openings 80 in the resin member 60. If there is one radial opening 80 when the stator 20 is completed, then there is one core 90. Furthermore, when the step of filling with liquid resin is performed (S14), the first mold 101 may be positioned above the stator core 25. In this case, the liquid resin flows from top to bottom along the vertical direction through the slot opening 9. Alternatively, when the step of filling with liquid resin is performed (S14), the stator core 25 may be positioned horizontally. In any embodiment, at least one of the above-described advantages can be obtained.

[0056] <7. Manufacturing method of stator 20 according to other embodiments> A method for manufacturing the stator 20 according to another embodiment will be described with reference to Figures 6, 9, and 10-12. Before starting the manufacturing method described below, a plurality of stator coils 27 are already provided on the stator core 25 (see Figure 6). The resin member 60 of the stator 20 manufactured by the method described below may be either resin member 60A or 60B. Also, steps S32, S34, and S38 shown in Figure 10 are the same as steps S12, S14, and S18 shown in Figure 5 and described above, so the explanation of these steps will be simplified or omitted below.

[0057] First, as shown in Figures 10 and 11, the stator magnet 29 is positioned between two circumferentially adjacent fingers 23 (S30). Next, the molding die 100 and at least one core 90 are positioned (S32), followed by the filling of liquid resin (S34).

[0058] Next, as shown in Figure 10, a step is performed to preheat the filled liquid resin to a first temperature (S36). The first temperature is the temperature at which the liquid resin hardens to the extent that it loses its fluidity. This heating is performed, for example, by heating the molding die 100. The resin after S36 may contain moisture. After that, a step is performed to remove the molding die 100 and at least one core 90 (S38).

[0059] Next, as shown in Figure 10, a step is performed in which a plurality of auxiliary magnets 48 are arranged (S40). More specifically, as illustrated in Figure 12, the plurality of auxiliary magnets 48 are arranged circumferentially on one radial side (in the example shown in the figure, the radially inner side) of the plurality of stator magnets 29. The number of plurality of auxiliary magnets 48 is the same as the number of plurality of stator magnets 29, and each auxiliary magnet 48 faces each stator magnet 29 in the radial direction. The magnetization directions of the radially facing auxiliary magnets 48 and stator magnets 29 are the same. Also, the residual magnetic flux density of the auxiliary magnet 48 is, for example, greater than the residual magnetic flux density of the stator magnet 29 facing the auxiliary magnet 48.

[0060] Next, a step is performed to heat the resin to a second temperature higher than the first temperature (S42). The second temperature is a temperature at which the resin can be completely dried and cured, and is lower than the glass transition temperature of the resin. This heating may be performed by directly blowing hot air, or by heating the stator core 25. This forms the resin member 60. Finally, the auxiliary magnet 48 is removed (S44), and the stator 20 is completed (see Figure 9).

[0061] With the above configuration, in the step of heating the resin to a second temperature (S42), the auxiliary magnet 48 is positioned so that even if the heat generated during the execution of S42 is transferred to the stator magnet 29, the position of the auxiliary magnet 48 can suppress demagnetization of the stator magnet 29. In particular, when the glass transition temperature of the resin member 60 is high, the second temperature also tends to rise. In this respect, with the above configuration, even if the temperature of the stator magnet 29 rises during the execution of S42 due to the high second temperature, the position of the auxiliary magnet 48 suppresses demagnetization of the stator magnet 29. Furthermore, the fluidity of the resin is lost when the filled resin is preheated (S36). This allows the mold 100 and core 90 to be removed before the resin dries and hardens (S42) (S38). Therefore, multiple auxiliary magnets 48 can be placed after the removal of the mold 100 and core 90, and before the resin dries and hardens (S40). Since the mold 100 and core 90 do not interfere with the placement of the auxiliary magnets 48, the manufacturing method of the stator 20 can be simplified.

[0062] <8. Summary> The contents described in some of the embodiments above can be understood, for example, as follows:

[0063] 1) A stator (20) according to at least one embodiment of the present disclosure is A stator core (25) extending circumferentially with respect to the axis, A plurality of teeth (28) protruding radially from the stator core (25), wherein the plurality of teeth (28) are spaced apart in the circumferential direction, A plurality of stator coils (27) wound around the plurality of teeth (28), each of which includes a coil end (21) located on one side in the axial direction relative to the stator core (25), The resin member (60) provided on the stator core (25), Equipped with, The aforementioned resin member (60) is A filling portion (65) for filling a slot opening (9) formed between two circumferentially adjacent teeth (28), comprising a filling portion (65) extending in the axial direction, A lid body portion (75) connected to one end of the filling portion (65) in the axial direction, the lid portion (70) having a lid body portion (75) that extends in the circumferential direction so as to cover the coil end (21) on one side in the axial direction from the stator core (25), Includes, The lid body portion (75) is, Inner surface (78) and, Outer surface (79) and, At least one radial opening (80) connects the inner opening (88) formed on the inner circumferential surface (78) and the outer opening (89) formed on the outer circumferential surface (79) in the radial direction, It has.

[0064] According to the configuration described in 1) above, even if the stator coil (27) generates heat when power is applied, the heat generated in the stator coil (27) is either transferred to the lid body (75) via the filling section (65) or directly to the lid body (75). The heat is then released from the lid (70). Since the lid body (75) of the lid (70) has at least one radially open section (80), the surface area of ​​the lid body (75) exposed to the surrounding air is increased. Therefore, the heat dissipation of the lid (70) is improved, resulting in a stator (20) with improved cooling performance.

[0065] 2) In some embodiments, the stator (20) described in 1) above, The at least one radial opening (80) has a first radial opening (81) located in an inner space (E) defined by the bent portion (21A) of the coil end (21).

[0066] According to the configuration described in 2) above, the first radial opening (81) is located in the inner space (E) of the coil end (21), so the distance between the coil end (21) and the first radial opening (81) can be reduced. A configuration is realized in which the heat generated at the coil end (21) is easily transferred to the first radial opening (81), so the cooling performance of the stator (20) is further improved.

[0067] 3) In some embodiments, the stator (20) is as described in 1) or 2) above, The at least one radial opening (80) has a second radial opening (82) located between two circumferentially adjacent coil ends (21).

[0068] According to the configuration described in 3) above, the second radial opening (82) is located between two circumferentially adjacent coil ends (21), so the distance between the coil ends (21) and the second radial opening (82) can be reduced. This configuration makes it easier for the heat generated at the coil ends (21) to be transferred to the second radial opening (82), thus further improving the cooling performance of the stator (20).

[0069] 4) In some embodiments, the stator (20) described in 3) above, The second radial opening (82) is opened to the one side at the one end (752) of the lid body (75).

[0070] According to the configuration in 4) above, the second radial opening (82) is not only open in the radial direction but also on one side in the axial direction, so that stagnation of airflow in the second radial opening (82) can be suppressed. A structure is realized in which heat exchange between the second radial opening (82) and the air is promoted, so the cooling performance of the stator (20) is further improved.

[0071] 5) In some embodiments, the stator (20) described in 3) above, The lid portion (70) further has a ring portion (72) connected to the one end portion (752) of the lid body portion (75) in the axial direction, The second radial opening (82) is formed between the lid body (75) and the ring portion (72).

[0072] According to the configuration in 5) above, the axial length of the lid portion (70) is increased by the provision of the ring portion (72), so the surface area of ​​the lid portion (70) exposed to the air surrounding the lid portion (70) is increased. Therefore, the cooling performance of the stator (20) is further improved. In addition, in the process of molding the resin member (60), a core (90) is placed where the second radial opening portion (82) is formed, so the liquid resin for forming the resin member (60) tends to flow poorly. In this respect, according to the configuration in 5) above, a flow path for the liquid resin for forming the circumferentially extending ring portion (72) is arranged in the molding process, so it is possible to suppress the stagnation of the liquid resin flow near where the second radial opening portion (82) is formed.

[0073] 6) In some embodiments, the stator (20) is as described in any of 3) to 5) above, The second radially open portion (82) is configured such that its circumferential length decreases as it moves toward the other side in the axial direction. The other end (85) of the second radially open portion (82) is located on the other side of the coil end (21) than the other end (24) of the coil end (21).

[0074] According to the configuration in 6) above, at least a portion of the second radial opening (82) is arranged to be aligned with the coil end (21) in the circumferential direction, so the distance between the coil end (21) and the second radial opening (82) can be reduced. A configuration is realized in which heat generated at the coil end (21) is easily transferred to the second radial opening (82), so the cooling performance of the stator (20) is further improved.

[0075] 7) In some embodiments, the stator (20) described in 4) above, The lid body portion (75) is, The one-side end face (755) is the end face on one side in the axial direction, It has at least one of the following: an inner tapered surface (758) connecting the one side end face (755) and the inner circumferential surface (78), or an outer tapered surface (759) connecting the one side end face (755) and the outer circumferential surface (79).

[0076] According to the configuration in 7) above, by providing at least one of the inner tapered surface (758) or the outer tapered surface (759), the lid body (75) can be closer to the coil end (21) compared to the case where the lid body (75) has a shape that is not chamfered. Therefore, a configuration is realized in which heat generated at the coil end (21) is easily transferred to the lid body (75), and the cooling performance of the stator (20) is further improved.

[0077] 8) In some embodiments, the stator (20) is as described in any of 1) to 7) above, The at least one radially open portion (80) is A first radially open portion (81) located in the inner space (E) defined by the bent portion (21A) of the coil end (21), The at least one radial opening (80) comprises a second radial opening (82) positioned between two circumferentially adjacent coil ends (21), It has, The first radial opening (81) and the second radial opening (82) are offset from each other in the circumferential direction.

[0078] When the first radial opening (81) and the second radial opening (82) are aligned in the circumferential direction, it is necessary to ensure the axial length of the portion of the lid body (75) between the first radial opening (81) and the second radial opening (82), which may result in the lid body (75) becoming axially elongated. In this regard, according to the configuration of 8) above, the first radial opening (81) and the second radial opening (82) are offset from each other in the circumferential direction, which shortens the axial length of the lid body (75) and makes the lid body (75) more compact.

[0079] 9) In some embodiments, the stator (20) is as described in any of 1) to 8) above, The system further comprises a plurality of stator magnets (29) arranged in the circumferential direction on one side of the stator core (25) in the radial direction.

[0080] According to the configuration in 9) above, even if the temperature of the stator core (25) rises due to the heat generated by the stator magnet (29), the heat generated in the stator core (25) can be released from the lid (70) of the resin member (60). Therefore, even when the stator (20) is applied to a magnetic geared electric machine (1), sufficient cooling performance is achieved, and the magnetic geared electric machine (1) can operate normally.

[0081] 10) In some embodiments, the stator (20) is as described in any of 1) to 9) above, The glass transition temperature of the resin member (60) is 130°C or higher.

[0082] According to the configuration described in 10) above, the resin component (60) can sufficiently withstand the heat generated by the stator coil (27), thus improving the heat resistance of the stator (20).

[0083] 11) A method for manufacturing a stator (20) according to at least one embodiment of the present invention is: A method for manufacturing a stator (20) as described in any of 1) to 10) above, Steps (S12, S32) include: positioning a mold (first mold 101) so as to cover the plurality of coil ends (21) arranged in the circumferential direction, and positioning at least one core (90) for forming the at least one radially open portion (80) within the space covered by the mold (first mold 101) to one side in the axial direction of the stator core (25); The steps (S14, S34) include pouring liquid resin for forming the resin member (60) into the space covered by the mold (first mold 101) and filling the slot opening (9) with the liquid resin, The steps include drying and curing the aforementioned resin (S16, S42), The steps of removing the mold (first mold 101) and the at least one core (90) (S18, S38), It is equipped with.

[0084] According to the configuration in 11) above, a resin member (60) including at least one radially open portion (80) can be formed. Therefore, a method for manufacturing a stator (20) with improved cooling performance is realized for the same reasons as in 1) above.

[0085] 12) In some embodiments, the method for manufacturing the stator (20) described in 11) above, The at least one radially open portion (80) has a first radially open portion (81) located in an inner space (E) defined by the bent portion (21A) of the coil end (21), The at least one core (90) includes a first core (91) for forming the first radial opening (81).

[0086] According to the configuration in 12) above, a first radial opening (81) can be formed. Therefore, a method for manufacturing a stator (20) with improved cooling performance is realized for the same reasons as in 2) above.

[0087] 13) In some embodiments, a method for manufacturing the stator (20) as described in 11) or 12) above, The at least one radial opening (80) has a second radial opening (82) positioned between two circumferentially adjacent coil ends (21), The at least one core (90) includes a second core (92) for forming the second radial opening (82).

[0088] According to the configuration in 13) above, a second radial opening (82) can be formed. Therefore, a method for manufacturing a stator (20) with improved cooling performance is realized for the same reasons as in 3) above.

[0089] 14) In some embodiments, a method for manufacturing a stator (20) as described in any of 11) to 13) above, In the step of filling with the resin (S14, S34), the stator core (25) is positioned so that the axial direction is vertical, and the resin is poured into the space.

[0090] According to the configuration described in 14) above, the liquid resin can flow vertically through the slot opening (9), making it easier to fill the slot opening (9) with the liquid resin.

[0091] 15) In some embodiments, a method for manufacturing a stator (20) as described in any of 11) to 14) above, The stator (20) is A plurality of fingers (23) projecting from the plurality of teeth (28) to one side in the radial direction, wherein the plurality of fingers (23) are spaced apart in the circumferential direction, Multiple stator magnets (29) are arranged alternately with multiple fingers (23) in the circumferential direction, Furthermore, Before performing the step of filling with the resin (S14), the step of placing a release agent (45) between the two circumferentially adjacent fingers (23) (S10) After performing the step (S18) of removing the mold (first mold 101) and the at least one core (90), the step (S20) of removing the release member (45) is performed, After performing the step (S20) of removing the release agent (45), the stator magnet (29) is positioned between two adjacent fingers (23) (S22), To further prepare.

[0092] According to the configuration described in 15) above, when filling with liquid resin, it is possible to suppress the resin from getting between two circumferentially adjacent fingers (23). In addition, since the liquid resin is dried and hardened before the stator magnet (29) is placed, it is possible to suppress the transfer of heat generated as the resin dries and hardens to the stator magnet (29), thereby avoiding demagnetization of the stator magnet (29) due to temperature rise.

[0093] 16) In some embodiments, a method for manufacturing a stator (20) as described in any of 11) to 14) above, The stator (20) is A plurality of fingers (23) projecting from the plurality of teeth (28) to one side in the radial direction, wherein the plurality of fingers (23) are spaced apart in the circumferential direction, Multiple stator magnets (29) are arranged alternately with multiple fingers (23) in the circumferential direction, Furthermore, Step (S30) of positioning the stator magnet (29) between two circumferentially adjacent fingers (23), Step (S40) of arranging a plurality of auxiliary magnets (48) on one side of the radial direction with respect to the plurality of stator magnets (29) so as to be aligned in the circumferential direction, After performing the step of drying and curing the resin (S42), the step of removing the plurality of auxiliary magnets (48) (S44) To further prepare.

[0094] According to the configuration described in 16) above, even if heat generated as the resin dries and hardens is transferred to the stator magnet (29), the presence of the auxiliary magnet (48) can suppress demagnetization of the stator magnet (29).

[0095] 17) In some embodiments, the method for manufacturing the stator (20) described in 16) above, After the step of filling with the resin (S34) and before the step of removing the mold (first mold 101) and the at least one core (90) (S38), the process further includes a step of preheating the resin poured into the mold (first mold 101) to a first temperature (S36), The step (S38) of removing the mold (first mold 101) and the at least one core (90) is performed after the preheating step (S36) and before the step (S40) of arranging the plurality of auxiliary magnets (48). In the step of drying and curing the resin (S42), after the step of arranging the auxiliary magnet (48) (S40), the resin is heated to a second temperature that is higher than the first temperature.

[0096] According to the configuration described in 17) above, the fluidity of the resin is lost when the filled resin is preheated. This allows the mold (first mold 101) and core (90) to be removed before the resin dries and hardens. Therefore, multiple auxiliary magnets (48) can be placed after the removal of the mold (first mold 101) and core (90) and before the resin dries and hardens. Since the mold (first mold 101) and core (90) do not obstruct the placement of the auxiliary magnets (48), the manufacturing method of the stator (20) can be simplified. [Explanation of Symbols]

[0097] 1: Magnetic geared electric machine 5: Rotation axis 7: External rotating equipment 8: Power transmission shaft 9: Slot opening 10: Magnetic rotor 15: Rotor core 19: Rotor Magnet 20: Status 21: Coil End 21A: Folding part 22: Separate coil end 23: Finger 24: End 25: Stator Core 27: Stator coil 28: Teeth 29: Stator Magnet 30: Magnetic pole rotor 34: Flange 45: Release material 48: Auxiliary magnet 50: Ring Unit 52: Non-magnetic material 55 :Magnetic pole piece 56: Magnetic pole single ventilation path 60: Resin component 65: Filling section 70: Lid 72: Ring section 75: Lid body part 78: Inner surface 79: Outer surface 80: Radial opening 81 :First radial open part 82:Second radial open part 83: End 85: End 88,881,891: Internal opening 89,882,892 :Outer opening 90: Middle child 91:1st core 92:Second core 101: First mold (mold) 751: End 752: End 755: One-sided end face 758: Inner tapered surface 759: Outer tapered surface E: Interior space

Claims

1. A stator core extending circumferentially with respect to the axis, A plurality of teeth projecting radially from the stator core to one side, wherein the plurality of teeth are spaced apart in the circumferential direction, A plurality of stator coils wound around the plurality of teeth, each including a coil end located on one side in the axial direction from the stator core, A resin member provided on the stator core, Equipped with, The aforementioned resin member is A filling portion for filling a slot opening formed between two teeth adjacent to each other in the circumferential direction, comprising a filling portion extending in the axial direction, A lid body portion connected to one end of the filling portion in the axial direction, the lid body portion having a lid body portion that extends in the circumferential direction so as to cover the coil end on one side in the axial direction from the stator core, Includes, The lid body portion is, Inner surface and, Outer surface and, At least one radially opening portion connecting the inner opening formed on the inner circumferential surface and the outer opening formed on the outer circumferential surface in the radial direction, Having, The at least one radially open portion is a first radially open portion located in the inner space defined by the bent portion of the coil end, and the first radially open portion is a through hole formed in the lid body such that the bent portion has a predetermined cover thickness. stata.

2. The at least one radial opening has a second radial opening located between two adjacent coil ends in the circumferential direction. The stator according to claim 1.

3. The region in which the first radially open portion exists overlaps with the region in which the second radially open portion exists in part in the axial direction. The stator according to claim 2.

4. The second radial opening is located at one end of the lid body and is open to the one side. The stator according to claim 2 or 3.

5. The lid portion further has a ring portion connected to one end of the lid body portion in the axial direction, The second radial opening is formed between the lid body and the ring portion. The stator according to claim 2 or 3.

6. The second radially open portion is configured such that its circumferential length decreases as it moves toward the other side in the axial direction. The other end of the second radially open portion is located on the other side of the one end of the coil end, The stator according to claim 2 or 3.

7. The lid body portion is, The one end face which is the one end face in the axial direction, It has at least one of the following: an inner tapered surface connecting the one side end face and the inner circumferential surface, or an outer tapered surface connecting the one side end face and the outer circumferential surface. The stator according to claim 4.

8. The first radial opening and the second radial opening are offset from each other in the circumferential direction. The stator according to claim 2.

9. The system further comprises a plurality of stator magnets arranged in the circumferential direction on one side of the stator core in the radial direction, The stator according to claim 1.

10. The glass transition temperature of the resin member is 130°C or higher. The stator according to claim 1.

11. A method for manufacturing a stator according to claim 1, The steps include: arranging a mold to cover the plurality of coil ends arranged in the circumferential direction, and arranging at least one core for forming the at least one radially open portion within the space covered by the mold, on one side in the axial direction of the stator core; The steps include pouring liquid resin for forming the resin member into the space covered by the mold, and filling the slot opening with the liquid resin. The steps include drying and curing the aforementioned resin, The steps include removing the mold and the at least one core, A method for manufacturing a stator, comprising:

12. The at least one radially open portion has a first radially open portion located in the inner space defined by the bent portion of the coil end, The at least one core includes a first core for forming the first radial opening, A method for manufacturing a stator according to claim 11.

13. The at least one radial opening has a second radial opening located between two circumferentially adjacent coil ends, The at least one core includes a second core for forming the second radial opening, A method for manufacturing a stator according to claim 11 or 12.

14. In the step of filling with the resin, the stator core is positioned so that the axial direction is vertical, and the resin is poured into the space. A method for manufacturing a stator according to claim 11 or 12.

15. The stator is, A plurality of fingers projecting from the plurality of teeth to one side in the radial direction, wherein the plurality of fingers are spaced apart in the circumferential direction, Multiple stator magnets arranged alternately with multiple fingers in the circumferential direction, Furthermore, Before performing the step of filling with the resin, the step of placing a release agent between the two fingers adjacent in the circumferential direction, After performing the step of removing the mold and the at least one core, the step of removing the release member, After performing the step of removing the mold release member, the stator magnet is positioned between two adjacent fingers, Furthermore, A method for manufacturing a stator according to claim 11 or 12.

16. The stator is, A plurality of fingers projecting from the plurality of teeth to one side in the radial direction, wherein the plurality of fingers are spaced apart in the circumferential direction, Multiple stator magnets arranged alternately with multiple fingers in the circumferential direction, Furthermore, The steps include: positioning the stator magnet between two fingers adjacent to each other in the circumferential direction; The steps include: arranging a plurality of auxiliary magnets on one side of the plurality of stator magnets in the radial direction so as to be aligned in the circumferential direction; After performing the step of drying and curing the resin, the step of removing the plurality of auxiliary magnets, Furthermore, A method for manufacturing a stator according to claim 11 or 12.

17. The process further includes a step of preheating the resin poured into the mold to a first temperature, after the step of filling the mold with the resin and before the step of removing the mold and the at least one core, The step of removing the mold and the at least one core is performed after the preheating step and before the step of arranging the plurality of auxiliary magnets. In the step of drying and curing the resin, after the step of arranging the auxiliary magnet, the resin is heated to a second temperature higher than the first temperature. A method for manufacturing a stator according to claim 16.

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