WO2024075455A1 - Stator structure and electric machine - Google Patents

Stator structure and electric machine Download PDF

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Publication number
WO2024075455A1
WO2024075455A1 PCT/JP2023/032155 JP2023032155W WO2024075455A1 WO 2024075455 A1 WO2024075455 A1 WO 2024075455A1 JP 2023032155 W JP2023032155 W JP 2023032155W WO 2024075455 A1 WO2024075455 A1 WO 2024075455A1
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WO
WIPO (PCT)
Prior art keywords
stator
passage
stator core
teeth
circumferential direction
Prior art date
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PCT/JP2023/032155
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French (fr)
Japanese (ja)
Inventor
俊幸 玉村
宜農 麻生
幸寛 小林
Original Assignee
パナソニックＩｐマネジメント株式会社
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2024075455A1 publication Critical patent/WO2024075455A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures

Definitions

  • This disclosure relates to a stator structure for an electric motor and an electric motor equipped with the same.
  • a stator structure for an electric motor that includes a stator core including multiple teeth, an insulator covering each tooth, a winding wound around the insulator, a stator frame formed in a cylindrical shape with an opening and a bottom that houses the stator, and a filling resin that is filled inside the stator frame (for example, Patent Document 1).
  • the stator frame of the stator structure in Patent Document 1 is provided with a self-closing valve at a resin injection port provided in the wall. When injecting the filling resin, a dispenser nozzle is inserted into the self-closing valve, and liquid filling resin is injected through the nozzle.
  • the stator assembly includes a stator core including a back yoke portion and a plurality of teeth, an insulator covering each of the plurality of teeth, and a winding wound around the insulator; a stator frame formed in a bottomed cylindrical shape with an opening and housing the stator; and a filling resin filled in a first space between the bottom of the stator frame and the stator and a second space between adjacent windings.
  • the stator core has at least one first passage and at least one second passage provided closer to the inner periphery than the first passage, and the first passage opens at each of one axial end and the other axial end of the stator core, and the second passage opens at each of the one axial end and the other axial end of the stator core.
  • the electric motor includes the stator structure described above.
  • FIG. 2 is a cross-sectional view illustrating a stator assembly according to the first embodiment.
  • FIG. 2 is a diagram for explaining the configuration of the stator assembly of the first embodiment, and is a perspective view that generally illustrates a stator core and a stator frame.
  • FIG. 2 is a diagram for explaining the configuration of the stator assembly of the first embodiment, and is a plan view that generally illustrates a segment core.
  • 1 is a plan view showing a schematic diagram of an electric motor according to a first embodiment
  • FIG. 1 is a front view showing a schematic diagram of an electric motor according to a first embodiment
  • FIG. 4 is a plan view illustrating a schematic configuration of a segment core according to a modified example of the first embodiment.
  • FIG. 1 is a plan view showing a schematic diagram of an electric motor according to a first embodiment
  • FIG. 1 is a front view showing a schematic diagram of an electric motor according to a first embodiment
  • FIG. 4 is a plan view illustrating a schematic configuration of
  • FIG. 11 is a plan view illustrating a segment core according to a second embodiment.
  • FIG. 11 is a plan view illustrating a segment core according to a modified example of the second embodiment.
  • FIG. 11 is a plan view illustrating a segment core according to a third embodiment.
  • stator component and an electric motor according to the present disclosure will be specifically described with reference to the drawings.
  • components that are not essential to the stator component and electric motor according to the present disclosure may be omitted.
  • the drawings shown below are schematic and do not accurately reflect the shape and number of actual components.
  • an XYZ Cartesian coordinate system is provided in the drawings shown below (FIGS. 1 to 7). The XYZ Cartesian coordinate system will be described in detail later.
  • a stator assembly 20 of the present embodiment is applicable to an inner rotor type three-phase synchronous motor, but is not limited thereto.
  • the configurations of the stator assembly 20 and the electric motor 10 of the present embodiment will be described below, and then a method for manufacturing the stator assembly 20 of the present embodiment will be described.
  • Fig. 1 is a cross-sectional view showing a stator component 20 of the first embodiment.
  • Fig. 2A is a diagram for explaining the configuration of the stator component 20 of the first embodiment, and is a perspective view showing a stator core 31 and a stator frame 40.
  • Fig. 2B is a diagram for explaining the configuration of the stator component 20 of the first embodiment, and is a plan view showing a segment core 33.
  • the stator component 20 of the present embodiment includes a stator 30, a stator frame 40, a printed wiring board 50, a connector 60, and a filled resin 70.
  • the stator 30 has a stator core 31 including a back yoke portion 32 and a plurality of teeth 33b, an insulator 34 covering each tooth 33b, and a winding body 35 wound around the insulator 34.
  • a second space S2 is formed between adjacent winding bodies 35.
  • the XYZ Cartesian coordinate system is defined as follows. First, the Z axis is defined parallel to the central axis of the stator 30. Next, the X axis is defined perpendicular to the central axis of the stator 30 and parallel to a line passing through the center of the connector 60. Then, the Y axis is set perpendicular to the X and Z axes. The positive direction of the X axis is the direction from the central axis of the stator 30 toward the connector 60. Additionally, the positive direction of the Z axis is opposite to the direction in which the stator 30 is inserted into the stator frame 40.
  • the stator core 31 of this embodiment is formed by joining multiple (12 in this example) segment cores 33.
  • each segment core 33 has a yoke portion 33a, teeth portion 33b, and flange portion 33c.
  • the back yoke portion 32 is formed by the multiple yoke portions 33a.
  • Each segment core 33 is formed by stacking electromagnetic steel sheets. Note that FIG. 2A shows only one each of the insulator 34 and winding body 35.
  • each segment core 33 has one first passage 33d and one second passage 33e.
  • the stator core 31 of this embodiment has multiple first passages 33d and multiple second passages 33e.
  • the first passages 33d are curved recesses provided on the outer peripheral surface of each segment core 33 (or the outer peripheral surface of the stator core 31).
  • the second passages 33e are provided closer to the inner periphery (or closer to the teeth portion 33b) than the first passages 33d in each segment core 33.
  • the second passages 33e are, for example, circular through holes that axially penetrate each segment core 33.
  • Each first passage 33d opens, on one hand, at a position closer to the opening 40a of the stator frame 40 than the end face 70a of the filled resin 70 (positive direction of the Z axis in FIG. 1) toward the opening 40a, and opens, on the other hand, into the first space S1. In this way, each first passage 33d opens at one axial end and the other axial end of the stator core 31.
  • Each second passage 33e opens, on one hand, at a position closer to the opening 40a than the end face 70a of the filled resin 70 toward the opening 40a of the stator frame 40, and opens, on the other hand, into the first space S1. In this way, each second passage 33e opens at one axial end and the other axial end of the stator core 31.
  • the distance D1 between the end of the teeth 33b in the circumferential direction of the stator core 31 (hereinafter also simply referred to as the circumferential direction) and the second passage 33e is greater than half the dimension L1 of the base end of the teeth 33b in the circumferential direction (D1>L1/2).
  • the distance D1 is greater than the dimension L2 of the yoke 33a in the radial direction of the stator core 31 (hereinafter also simply referred to as the radial direction) (D1>L2).
  • the distance D2 between the end of the teeth 33b in the circumferential direction and the first passage 33d is greater than half the dimension L1 (D2>L1/2).
  • each segment core 33 the distance D2 is greater than the dimension L2 (D2>L2).
  • the second passage 33e is located on a straight line (center line CL in FIG. 2B) that passes through the center of the stator core 31 and the center of the teeth portion 33b.
  • the center line CL of the segment core 33 is parallel to the X-axis. That is, in explaining the segment core 33, a segment core 33 in which the center line CL is parallel to the X-axis is used as an example. The same is true for FIGS. 4 to 7.
  • each segment core 33 The shape of each segment core 33 is the same as the others. Therefore, the multiple first passages 33d are arranged at equal intervals in the circumferential direction. Also, the multiple second passages 33e are arranged at equal intervals in the circumferential direction. Also, in each segment core 33, the cross-sectional area of the first passage 33d is larger than the cross-sectional area of the second passage 33e when viewed from the axial direction of the stator core 31. Note that the cross-sectional area of the first passage 33d here refers to the area of the cut edge of the first passage 33d created when the segment core 33 is cut on a plane perpendicular to the axial direction of the stator core 31.
  • the cross-sectional area of the second passage 33e refers to the area of the cut edge of the second passage 33e created when the segment core 33 is cut on a plane perpendicular to the axial direction of the stator core 31. Therefore, when viewed from the axial direction of the stator core 31, the total area GA1, which is the sum of the cross-sectional areas of the multiple first passages 33d, is larger than the total area GA2, which is the sum of the cross-sectional areas of the multiple second passages 33e. However, the total area GA1 may be smaller than the total area GA2 or may be equal to the total area GA2.
  • the stator frame 40 is formed in a bottomed cylindrical shape with an opening 40a, and houses the stator 30.
  • a first space S1 is formed between the bottom of the stator frame 40 and the stator 30.
  • the stator frame 40 may be made of, for example, an aluminum alloy.
  • the printed wiring board 50 is electrically connected to the winding body 35.
  • the printed wiring board 50 is arranged within the stator frame 40 so as to be closer to the opening 40 than the stator 30.
  • the printed wiring board 50 may be formed in an annular (donut-shaped), sector-shaped (arc-shaped), C-shaped, or other shape.
  • the printed wiring board 50 has a hollow portion in the center, through which the output shaft 80 of the electric motor 10 (see FIG. 3B described below) is inserted.
  • the connector 60 is electrically connected to the printed wiring board 50.
  • the connector 60 is electrically connected to the winding body 35 via the printed wiring board 50.
  • a power source is connected to the connector 60 to supply power to the winding body 35.
  • the connector 60 is disposed near the opening 40a of the stator frame body 40.
  • the filling resin 70 is filled into the first space S1, the second space S2, and the third space S3.
  • the filling resin 70 is, for example, an epoxy resin, but is not limited to this.
  • the filling resin 70 contains a filler.
  • the filler content of the filling resin 70 is, for example, 10% by weight or more and 50% by weight or less.
  • FIG. 3A is a plan view showing the electric motor 10 of the first embodiment.
  • FIG. 3B is a front view showing the electric motor 10 of the first embodiment.
  • the electric motor 10 includes components such as a rotor, an output shaft 80, a pair of bearings, and a bracket in addition to the stator assembly 20 described above.
  • the rotor, the pair of bearings, and the bracket are not shown.
  • the rotor having the output shaft 80 is disposed in the internal space of the stator assembly 20. Both ends of the output shaft 80 are rotatably supported by the pair of bearings.
  • the outer ring side of one of the bearings is fixed to the housing of the bracket.
  • the outer ring side of the other bearing is fixed to the housing at the bottom of the stator frame 40.
  • the manufacturing method for the stator assembly includes a preparation step, an insertion step, an injection step, and a curing step.
  • the above-mentioned stator 30 and the above-mentioned stator frame 40 are prepared.
  • the stator 30 is inserted into the stator frame 40.
  • the insertion method may be, for example, shrink fitting or press fitting.
  • stator frame 40 In the injection process, the stator frame 40 is positioned so that its opening 40a faces upward, and liquid filling resin 70 is injected into the first space S1, the second space S2, and the third space S3 through each first passage 33d. At this time, at least a portion of the air present in each space (particularly the first space S1) is pushed by the injected filling resin 70 and can escape to the outside through the second passage 33e.
  • the liquid filling resin 70 is cured while the stator frame 40 is positioned with its opening 40a facing upward.
  • the stator assembly 20 of this modified example differs from the first embodiment in the number of second passages 33e. The following mainly describes the differences from the first embodiment.
  • FIG. 4 is a plan view showing a schematic diagram of a segment core 33 according to a modified example of the first embodiment.
  • each segment core 33 has a plurality of second passages 33e (two in this example).
  • Each second passage 33e is provided closer to the inner periphery (or closer to the teeth portion 33b) than the first passages 33d in the segment core 33 having it.
  • Each second passage 33e is a circular through hole that axially passes through the segment core 33 having it.
  • the two second passages 33e may be arranged symmetrically with respect to the center line CL.
  • the number of second passages 33e may be three or more.
  • the stator assembly 20 of this embodiment differs from the first embodiment in the shape of the second passages 33e. The following mainly describes the differences from the first embodiment.
  • FIG. 5 is a plan view that shows a schematic diagram of the segment core 33 of the second embodiment.
  • the second passage 33e is rectangular, and in particular square.
  • the four corners of the rectangle are sharp (or angular).
  • the two inner sides of the rectangle extend along the main magnetic path between the yoke portion 33a and the teeth portion 33b. In other words, the two inner sides of the rectangle extend in a direction that intersects with the direction in which the teeth portion 33b extends at a predetermined angle (45° in this example).
  • FIG. 6 is a plan view that shows a schematic diagram of a segment core 33 according to a modified example of the second embodiment.
  • the second passage 33e has a substantially rectangular shape, in particular a substantially square shape. At least one corner of the substantially rectangular shape (four corners in this example) has a rounded shape (or an R shape).
  • the stator assembly 20 of this embodiment differs from the first embodiment in the configuration of the first passage 33d. The following mainly describes the differences from the first embodiment.
  • FIG. 7 is a plan view that shows a schematic diagram of the segment core 33 of the third embodiment.
  • the first passage 33d is a circular through hole that passes through the stator core 31 in the axial direction.
  • the cross-sectional area of the first passage 33d and the cross-sectional area of the second passage 33e are equal to each other when viewed from the axial direction of the stator core 31.
  • the areas of the two passages may be different from each other.
  • the stator assembly 20 includes a stator 30, a stator frame 40, and a filling resin 70.
  • the stator 30 has a stator core 31 including a back yoke portion 32 and a plurality of teeth 33b, an insulator 34 covering each tooth 33b, and a winding body 35 wound around the insulator 34.
  • a second space S2 is formed between adjacent winding bodies 35.
  • the back yoke portion 32 may be formed in a generally cylindrical shape, and each tooth portion 33b may protrude radially inward from the back yoke portion 32.
  • the back yoke portion 32 may be of a split type or an integrated type.
  • the stator core 31 may be formed by stacking a number of electromagnetic steel plates.
  • the insulator 34 may be made of an insulating resin material.
  • the winding body 35 may be made of an insulated electric wire having an insulating coating. The winding body 35 may be wound using a concentrated winding method or a distributed winding method.
  • the stator frame 40 is formed in a bottomed cylindrical shape with an opening 40a, and houses the stator 30.
  • a first space S1 is formed between the bottom of the stator frame 40 and the stator 30.
  • a third space S3 may be formed between the inner peripheral surface of the stator frame 40 and the outer peripheral surface of the stator core 31.
  • the stator frame 40 may be made of a material with high thermal conductivity, such as aluminum or an aluminum alloy. The thermal conductivity of the material constituting the stator frame 40 may be higher than the thermal conductivity of the material constituting the stator core 31.
  • the filling resin 70 is filled into the first space S1 and the second space S2. If the third space S3 exists, the filling resin may also be filled into the third space S3.
  • the filling resin 70 is usually a resin composition containing multiple components, and may include epoxy resin, phenol resin, polyester resin, acrylic resin, or polyurethane resin.
  • the filling resin 70 may include a filler. As the filler, inorganic particles are preferable, and aluminum hydroxide may be used, for example.
  • the filler content of the filling resin 70 may be 10% by weight or more and 50% by weight or less.
  • the thermal conductivity of the filling resin 70 may be higher than the thermal conductivity of the constituent material of the insulating coating of the insulated wire that constitutes the winding body 35.
  • the bending modulus of the filling resin 70 may be lower than the bending modulus of the constituent material of the stator frame body 40.
  • the stator core 31 has at least one first passage 33d and at least one second passage 33e.
  • the first passage 33d opens at each of the axial end and the other axial end of the stator core 31.
  • the first passage 33d may connect one axial side and the other axial side of the stator core 31 when the filled resin 70 is filled.
  • the second passage 33e is provided closer to the inner circumference than the first passage 33d.
  • the second passage 33e opens at each of the axial end and the other axial end of the stator core 31.
  • the second passage 33e may connect one axial side and the other axial side of the stator core 31 when the filled resin 70 is filled.
  • first passage 33d and the second passage 33e are not particularly limited, and for example, each passage may extend along the axial direction of the stator core 31, or each passage may extend obliquely with respect to the axial direction.
  • the shape of the openings of the first passage 33d and the second passage 33e is not particularly limited and may be, for example, circular, elliptical, rectangular, polygonal, etc.
  • one of the two passages can be used as an injection path for the filling resin 70, and the other can be used as an air vent hole.
  • each first passage 33d as an injection path for the filling resin 70
  • each second passage 33e as an air vent hole.
  • the first passage 33d or the second passage 33e used as an injection path is at least partially filled with the filling resin 70.
  • the second passage 33e or the first passage 33d used as an air vent hole may or may not be at least partially filled with the filling resin 70.
  • it is preferable that at least a portion of the latter is filled with the filling resin 70.
  • the liquid filling resin 70 is injected while the stator core 31 is housed in the stator frame 40.
  • the liquid filling resin 70 may be injected from above through each first passage 33d with the stator frame 40 arranged with its opening 40a facing upward and the stator core 31 arranged with its axial direction aligned vertically.
  • the liquid filling resin 70 may pass through each first passage 33d and first fill the first space S1, and then fill the second space S2.
  • the air present in each space especially the first space S1 can escape upward through each second passage 33e, thereby increasing the filling rate of the filling resin 70.
  • the liquid filling resin 70 is less likely to leak.
  • liquid level of the filled resin 70 when the filling of the liquid filled resin 70 is completed is lower than the height of the inlet of the first passage 33d (or the second passage 33e), which is the inlet passage.
  • the liquid filled resin 70 can be hardened while the stator core 31 is positioned so that its axial direction is aligned vertically.
  • the first passage 33d may be a recess provided on the outer peripheral surface of the stator core 31, or a through hole that passes through the stator core 31 in the axial direction.
  • the second passage 33e may be a through hole that passes through the stator core 31 in the axial direction. Such first passage 33d and second passage 33e can be easily formed.
  • the distance D1 (e.g., the shortest distance) between the end of the teeth 33b in the circumferential direction of the stator core 31 and the second passage 33e may be greater than half the dimension of the base end of the teeth 33b in the circumferential direction.
  • the second passage 33e may be provided closer to the outer periphery than the base end of the teeth 33b (or in the back yoke portion 32). With this configuration, a sufficient distance is ensured between the end of the teeth 33b in the circumferential direction and the second passage 33e, making it possible to suppress magnetic resistance in the magnetic path connecting the back yoke portion 32 and the teeth 33b.
  • the distance (e.g., the shortest distance) between the end of the teeth in the circumferential direction of the stator core and the second passage may be greater than the dimension of the back yoke in the radial direction of the stator core.
  • the second passage may be provided closer to the outer periphery than the base end of the teeth (or in the back yoke).
  • the distance D2 (e.g., the shortest distance) between the end of the teeth 33b in the circumferential direction of the stator core 31 and the first passage 33d may be greater than half the dimension of the base end of the teeth 33b in the circumferential direction.
  • the first passage 33d may be provided closer to the outer periphery than the base end of the teeth 33b (or in the back yoke portion 32). With this configuration, a sufficient distance is ensured between the end of the teeth 33b in the circumferential direction and the first passage 33d, and magnetic resistance in the magnetic path connecting the back yoke portion 32 and the teeth 33b can be suppressed.
  • the distance D2 between the end of the teeth 33b in the circumferential direction of the stator core 31 and the first passage 33d may be greater than the dimension of the back yoke 32 in the radial direction of the stator core 31.
  • the first passage 33d may be provided closer to the outer periphery than the base end of the teeth 33b (or in the back yoke 32). With this configuration, a sufficient distance is ensured between the end of the teeth 33b in the circumferential direction and the first passage 33d, and magnetic resistance in the magnetic path connecting the back yoke 32 and the teeth 33b can be suppressed.
  • the second passage 33e When viewed from the axial direction of the stator core 31, the second passage 33e may be located on a straight line passing through the center of the stator core 31 and the center of the teeth 33b. With this configuration, the distance between one end of the teeth 33b in the circumferential direction of the stator core 31 and the second passage 33e, and the distance between the other end of the teeth 33b in the circumferential direction and the second passage 33e, are substantially equal, making it difficult for large magnetic resistance to form near the teeth 33b.
  • the first passages 33d may be provided at intervals in the circumferential direction of the stator core 31.
  • the multiple first passages 33d may be used as injection paths for the liquid filling resin 70. With this configuration, the filling resin 70 can be injected from multiple locations in the circumferential direction of the stator core 31, thereby further increasing the filling rate of the filling resin 70.
  • the multiple first passages 33d may be arranged at equal intervals in the circumferential direction of the stator core 31. This configuration can impart symmetry to the magnetic circuit of the stator core 31. Specifically, the magnetic circuit of the stator core 31 can be made closer to rotational symmetry with respect to the center of the stator core 31.
  • the second passages 33e may be provided at intervals in the circumferential direction of the stator core 31.
  • the second passages 33e may be used as air vent holes when injecting the filling resin 70. With this configuration, air is released from multiple locations in the circumferential direction of the stator core 31, so the filling rate of the filling resin 70 can be further increased.
  • the second passages 33e may be arranged at equal intervals in the circumferential direction of the stator core 31. This configuration can impart symmetry to the magnetic circuit of the stator core 31. Specifically, the magnetic circuit of the stator core 31 can be made to approach rotational symmetry with respect to the center of the stator core 31.
  • the one with the larger total area as viewed in the axial direction of the stator core 31 may be used as an injection path for the liquid filling resin 70.
  • the one with the smaller total area as viewed in the axial direction of the stator core 31 may be used as an air vent hole when injecting the filling resin 70. With this configuration, the filling rate of the filling resin 70 can be further increased.
  • the number of first passages 33d and the number of second passages 33e may be the same or different.
  • the positions (angular positions) of the first passages 33d and the positions (angular positions) of the second passages 33e in the circumferential direction of the stator core 31 may be the same or different.
  • the shape of the second passage 33e may be circular, elliptical, or polygonal. If the second passage 33e is polygonal, it is preferable that at least one side constituting the polygon extends along the main magnetic path of the stator core 31 from the viewpoint of suppressing the magnetic resistance of the main magnetic path.
  • the electric motor 10 includes any one of the stator components 20 described above.
  • the electric motor 10 may further include components such as a rotor, an output shaft 80 (rotating shaft), a pair of bearings, and a bracket.
  • the rotor having the output shaft 80 may be disposed in the internal space of the stator component 20. Both ends of the output shaft 80 may be rotatably supported by a pair of bearings.
  • the outer ring side of one of the bearings may be fixed to a housing portion of the bracket.
  • the outer ring side of the other bearing may be fixed to a housing portion at the bottom of the stator frame 40.
  • a stator including a stator core including a back yoke portion and a plurality of teeth, an insulator covering each of the teeth, and a winding wound around the insulator; a stator frame formed in a bottomed cylindrical shape having an opening and housing the stator; a filling resin that is filled in a first space between a bottom of the stator frame and the stator and a second space between adjacent winding bodies, the stator core has at least one first passage and at least one second passage provided closer to the inner periphery than the first passage, the first passage is open to each of one axial end and the other axial end of the stator core, A stator structure, wherein the second passage is open to each of one axial end and the other axial end of the stator core.
  • the first passage is a recess provided in an outer peripheral surface of the stator core, or a through hole passing through the stator core in an axial direction thereof,
  • This disclosure can be used in stator structures and electric motors.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The present invention prevents leakage of a filling resin. A disclosed stator structure (20) comprises: a stator (30) having a stator core (31), an insulator (34), and wound bodies (35); a bottomed cylindrical stator frame (40) that houses the stator (30); and a filling resin that fills a first space between the bottom portion of the stator frame (40) and the stator (30) and a second space between adjacent wound bodies (35). The stator core (31) has at least one first passage (33d) and at least one second passage (33e) provided further toward the inner circumferential side than the first passage (33d). The first passage (33d) opens to each of one end of the stator core (31) in the axial direction and the other end thereof in the axial direction. The second passage (33e) opens to each of one end of the stator core (31) in the axial direction and the other end thereof in the axial direction.

Description

固定子構成体および電動機Stator Assembly and Electric Motor
　本開示は、電動機の固定子構成体およびそれを備えた電動機に関する。 This disclosure relates to a stator structure for an electric motor and an electric motor equipped with the same.
　従来、電動機の固定子構成体として、複数のティース部を含む固定子磁心、各ティース部を覆うインシュレータ、およびインシュレータに巻回された巻装体を有する固定子と、開口を有する有底筒状に形成され、固定子を収容する固定子枠体と、固定子枠体の内部に充填される充填樹脂と、を備える固定子構成体が知られている（例えば、特許文献１）。特許文献１の固定子構成体の固定子枠体は、その壁部に設けられた樹脂注入口にセルフクローズ弁が設けられている。充填樹脂の注入に際しては、セルフクローズ弁にディスペンサのノズルが挿入され、当該ノズルを介して液状の充填樹脂が注入される。 Conventionally, a stator structure for an electric motor is known that includes a stator core including multiple teeth, an insulator covering each tooth, a winding wound around the insulator, a stator frame formed in a cylindrical shape with an opening and a bottom that houses the stator, and a filling resin that is filled inside the stator frame (for example, Patent Document 1). The stator frame of the stator structure in Patent Document 1 is provided with a self-closing valve at a resin injection port provided in the wall. When injecting the filling resin, a dispenser nozzle is inserted into the self-closing valve, and liquid filling resin is injected through the nozzle.
日本国特許第６５６１３０８号公報Japanese Patent No. 6561308
　しかしながら、特許文献１の固定子構成体では、樹脂注入口にセルフクローズ弁が設けられているものの、充填樹脂の注入後、例えば樹脂注入口からノズルを抜き取る際に、樹脂注入口から液状の充填樹脂が漏れるおそれがある。このような状況において、本開示は、充填樹脂が漏れるのを抑止することを目的の１つとする。 However, in the stator structure of Patent Document 1, although a self-closing valve is provided at the resin injection port, there is a risk of liquid filled resin leaking from the resin injection port after the filled resin is injected, for example when removing the nozzle from the resin injection port. In such a situation, one of the objectives of the present disclosure is to prevent the filled resin from leaking.
　本開示に係る一形態は、固定子構成体に関する。当該固定子構成体は、バックヨーク部と複数のティース部を含む固定子磁心、前記複数のティース部の各々を覆うインシュレータ、および前記インシュレータに巻回された巻装体を有する固定子と、開口を有する有底筒状に形成され、前記固定子を収容する固定子枠体と、前記固定子枠体の底部と前記固定子との間の第１空間および隣り合う前記巻装体の間の第２空間に充填される充填樹脂と、を備える。前記固定子磁心は、少なくとも１つの第１通路と、前記第１通路よりも内周寄りに設けられた少なくとも１つの第２通路と、を有し、前記第１通路は、前記固定子磁心の軸方向一端および軸方向他端の各々に開口しており、前記第２通路は、前記固定子磁心の前記軸方向一端および前記軸方向他端の各々に開口している。 One aspect of the present disclosure relates to a stator assembly. The stator assembly includes a stator core including a back yoke portion and a plurality of teeth, an insulator covering each of the plurality of teeth, and a winding wound around the insulator; a stator frame formed in a bottomed cylindrical shape with an opening and housing the stator; and a filling resin filled in a first space between the bottom of the stator frame and the stator and a second space between adjacent windings. The stator core has at least one first passage and at least one second passage provided closer to the inner periphery than the first passage, and the first passage opens at each of one axial end and the other axial end of the stator core, and the second passage opens at each of the one axial end and the other axial end of the stator core.
　本開示に係る別の一形態は、電動機に関する。当該電動機は、上述の固定子構成体を備える。 Another aspect of the present disclosure relates to an electric motor. The electric motor includes the stator structure described above.
　本開示によれば、充填樹脂が漏れるのを抑止することができる。 According to this disclosure, it is possible to prevent the filling resin from leaking.
実施形態１の固定子構成体を模式的に示す断面図である。FIG. 2 is a cross-sectional view illustrating a stator assembly according to the first embodiment. 実施形態１の固定子構成体の構成について説明するための図であって、固定子磁心と固定子枠体を概略的に示す斜視図である。FIG. 2 is a diagram for explaining the configuration of the stator assembly of the first embodiment, and is a perspective view that generally illustrates a stator core and a stator frame. 実施形態１の固定子構成体の構成について説明するための図であって、セグメントコアを概略的に示す平面図である。FIG. 2 is a diagram for explaining the configuration of the stator assembly of the first embodiment, and is a plan view that generally illustrates a segment core. 実施形態１の電動機を模式的に示す平面図である。1 is a plan view showing a schematic diagram of an electric motor according to a first embodiment; 実施形態１の電動機を模式的に示す正面図である。FIG. 1 is a front view showing a schematic diagram of an electric motor according to a first embodiment; 実施形態１の変形例のセグメントコアを概略的に示す平面図である。FIG. 4 is a plan view illustrating a schematic configuration of a segment core according to a modified example of the first embodiment. 実施形態２のセグメントコアを概略的に示す平面図である。FIG. 11 is a plan view illustrating a segment core according to a second embodiment. 実施形態２の変形例のセグメントコアを概略的に示す平面図である。FIG. 11 is a plan view illustrating a segment core according to a modified example of the second embodiment. 実施形態３のセグメントコアを概略的に示す平面図である。FIG. 11 is a plan view illustrating a segment core according to a third embodiment.
　本開示に係る固定子構成体および電動機の実施形態について例を挙げて以下に説明する。しかしながら、本開示は以下に説明する例に限定されない。以下の説明では、具体的な数値や材料を例示する場合があるが、本開示の効果が得られる限り、他の数値や材料を適用してもよい。 The following describes examples of embodiments of the stator structure and electric motor according to the present disclosure. However, the present disclosure is not limited to the examples described below. In the following description, specific numerical values and materials may be given as examples, but other numerical values and materials may be applied as long as the effects of the present disclosure are obtained.
　以下では、本開示に係る固定子構成体および電動機の一例について、図面を参照して具体的に説明する。以下で説明する一例の固定子構成体および電動機の構成要素のうち、本開示に係る固定子構成体および電動機に必須ではない構成要素は省略してもよい。なお、以下で示す図は模式的なものであり、実際の部材の形状や数を正確に反映するものではない。なお、以下に示す図面（図１～図７）において、ＸＹＺ直交座標系が設けられている。ＸＹＺ直交座標系の詳細については、後ほど説明する。 Below, an example of a stator component and an electric motor according to the present disclosure will be specifically described with reference to the drawings. Among the components of the example stator component and electric motor described below, components that are not essential to the stator component and electric motor according to the present disclosure may be omitted. Note that the drawings shown below are schematic and do not accurately reflect the shape and number of actual components. Note that an XYZ Cartesian coordinate system is provided in the drawings shown below (FIGS. 1 to 7). The XYZ Cartesian coordinate system will be described in detail later.
　《実施形態１》
　本開示の実施形態１について説明する。本実施形態の固定子構成体２０は、インナーロータ型の三相同期電動機に適用可能であるが、これに限られるものではない。以下では、まず、本実施形態の固定子構成体２０および電動機１０の構成について説明し、その後、本実施形態の固定子構成体２０を製造する方法について説明する。 First Embodiment
A first embodiment of the present disclosure will be described. A stator assembly 20 of the present embodiment is applicable to an inner rotor type three-phase synchronous motor, but is not limited thereto. First, the configurations of the stator assembly 20 and the electric motor 10 of the present embodiment will be described below, and then a method for manufacturing the stator assembly 20 of the present embodiment will be described.
　－固定子構成体の構成－
　図１は、実施形態１の固定子構成体２０を模式的に示す断面図である。図２Ａは、実施形態１の固定子構成体２０の構成について説明するための図であって、固定子磁心３１と固定子枠体４０を概略的に示す斜視図である。図２Ｂは、実施形態１の固定子構成体２０の構成について説明するための図であって、セグメントコア３３を概略的に示す平面図である。図１、図２Ａおよび図２Ｂに示すように、本実施形態の固定子構成体２０は、固定子３０と、固定子枠体４０と、印刷配線板５０と、コネクタ６０と、充填樹脂７０とを備える。 - Configuration of stator assembly -
Fig. 1 is a cross-sectional view showing a stator component 20 of the first embodiment. Fig. 2A is a diagram for explaining the configuration of the stator component 20 of the first embodiment, and is a perspective view showing a stator core 31 and a stator frame 40. Fig. 2B is a diagram for explaining the configuration of the stator component 20 of the first embodiment, and is a plan view showing a segment core 33. As shown in Figs. 1, 2A, and 2B, the stator component 20 of the present embodiment includes a stator 30, a stator frame 40, a printed wiring board 50, a connector 60, and a filled resin 70.
　固定子３０は、バックヨーク部３２および複数のティース部３３ｂを含む固定子磁心３１と、各ティース部３３ｂを覆うインシュレータ３４と、インシュレータ３４に巻回された巻装体３５とを有する。隣り合う巻装体３５の間には、第２空間Ｓ２が形成される。 The stator 30 has a stator core 31 including a back yoke portion 32 and a plurality of teeth 33b, an insulator 34 covering each tooth 33b, and a winding body 35 wound around the insulator 34. A second space S2 is formed between adjacent winding bodies 35.
　なお、図面においてＸＹＺ直交座標系は、以下のように定義される。まず、固定子３０の中心軸に平行にＺ軸を定める。次に、固定子３０の中心軸に垂直で、かつコネクタ６０の中心を通る直線に対し平行にＸ軸を定める。そして、Ｘ軸およびＺ軸に垂直になるようにＹ軸を設ける。Ｘ軸の正の向きは、固定子３０の中心軸からコネクタ６０へ向かう向きである。また、Ｚ軸の正の向きは、固定子３０を固定子枠体４０へ入れる向きとは逆向きである。 In the drawings, the XYZ Cartesian coordinate system is defined as follows. First, the Z axis is defined parallel to the central axis of the stator 30. Next, the X axis is defined perpendicular to the central axis of the stator 30 and parallel to a line passing through the center of the connector 60. Then, the Y axis is set perpendicular to the X and Z axes. The positive direction of the X axis is the direction from the central axis of the stator 30 toward the connector 60. Additionally, the positive direction of the Z axis is opposite to the direction in which the stator 30 is inserted into the stator frame 40.
　図２Ａに示すように、本実施形態の固定子磁心３１は、複数（この例では、１２個）のセグメントコア３３を結合して構成される。各セグメントコア３３は、図２Ｂに示すように、ヨーク部３３ａと、ティース部３３ｂと、鍔部３３ｃとを有する。複数のセグメントコア３３が環状に連結されると、複数のヨーク部３３ａによってバックヨーク部３２が構成される。各セグメントコア３３は、電磁鋼板を積層して構成される。なお、図２Ａには、インシュレータ３４および巻装体３５を、それぞれ１つずつのみ示してある。 As shown in FIG. 2A, the stator core 31 of this embodiment is formed by joining multiple (12 in this example) segment cores 33. As shown in FIG. 2B, each segment core 33 has a yoke portion 33a, teeth portion 33b, and flange portion 33c. When multiple segment cores 33 are connected in an annular shape, the back yoke portion 32 is formed by the multiple yoke portions 33a. Each segment core 33 is formed by stacking electromagnetic steel sheets. Note that FIG. 2A shows only one each of the insulator 34 and winding body 35.
　図２Ｂに示すように、各セグメントコア３３は、第１通路３３ｄおよび第２通路３３ｅを１つずつ有する。したがって、本実施形態の固定子磁心３１は、複数の第１通路３３ｄおよび複数の第２通路３３ｅを有する。第１通路３３ｄは、各セグメントコア３３の外周面（あるいは、固定子磁心３１の外周面）に設けられた曲線状の凹部である。第２通路３３ｅは、各セグメントコア３３において、第１通路３３ｄよりも内周寄り（あるいは、ティース部３３ｂに近い位置）に設けられる。第２通路３３ｅは、各セグメントコア３３を軸方向に貫通する例えば円形の貫通孔である。 As shown in FIG. 2B, each segment core 33 has one first passage 33d and one second passage 33e. Thus, the stator core 31 of this embodiment has multiple first passages 33d and multiple second passages 33e. The first passages 33d are curved recesses provided on the outer peripheral surface of each segment core 33 (or the outer peripheral surface of the stator core 31). The second passages 33e are provided closer to the inner periphery (or closer to the teeth portion 33b) than the first passages 33d in each segment core 33. The second passages 33e are, for example, circular through holes that axially penetrate each segment core 33.
　各第１通路３３ｄは、一方において、充填樹脂７０の固定子枠体４０の開口４０ａへ向かって（図１におけるＺ軸の正の向き）の端面７０ａよりも開口４０ａに近い位置で開口し、他方において、第１空間Ｓ１に開口している。このように、各第１通路３３ｄは、固定子磁心３１の軸方向一端およびＺ軸方向他端の各々に開口している。各第２通路３３ｅは、一方において、充填樹脂７０の固定子枠体４０の開口４０ａへ向かっての端面７０ａよりも開口４０ａに近い位置で開口し、他方において、第１空間Ｓ１に開口している。このように、各第２通路３３ｅは、固定子磁心３１の軸方向一端および軸方向他端の各々に開口している。 Each first passage 33d opens, on one hand, at a position closer to the opening 40a of the stator frame 40 than the end face 70a of the filled resin 70 (positive direction of the Z axis in FIG. 1) toward the opening 40a, and opens, on the other hand, into the first space S1. In this way, each first passage 33d opens at one axial end and the other axial end of the stator core 31. Each second passage 33e opens, on one hand, at a position closer to the opening 40a than the end face 70a of the filled resin 70 toward the opening 40a of the stator frame 40, and opens, on the other hand, into the first space S1. In this way, each second passage 33e opens at one axial end and the other axial end of the stator core 31.
　各セグメントコア３３において、固定子磁心３１の周方向（以下、単に周方向ともいう。）におけるティース部３３ｂの端部と、第２通路３３ｅとの間の距離Ｄ１は、ティース部３３ｂの周方向における基端部の寸法Ｌ１の半分よりも大きい（Ｄ１＞Ｌ１／２）。また、各セグメントコア３３において、距離Ｄ１は、固定子磁心３１の径方向（以下、単に径方向ともいう。）におけるヨーク部３３ａの寸法Ｌ２よりも大きい（Ｄ１＞Ｌ２）。また、各セグメントコア３３において、周方向におけるティース部３３ｂの端部と、第１通路３３ｄとの間の距離Ｄ２は、寸法Ｌ１の半分よりも大きい（Ｄ２＞Ｌ１／２）。また、各セグメントコア３３において、距離Ｄ２は、寸法Ｌ２よりも大きい（Ｄ２＞Ｌ２）。さらに、固定子磁心３１の軸方向から見て、第２通路３３ｅは、固定子磁心３１の中心と前記ティース部３３ｂの中心とを通る直線（図２Ｂの中心線ＣＬ）上に位置する。なお、図２Ｂにおいて、セグメントコア３３の中心線ＣＬとＸ軸とは平行である。すなわち、セグメントコア３３の説明にあたり、中心線ＣＬとＸ軸とが平行となるセグメントコア３３を例にして説明している。このことは、図４～図７においても同様である。 In each segment core 33, the distance D1 between the end of the teeth 33b in the circumferential direction of the stator core 31 (hereinafter also simply referred to as the circumferential direction) and the second passage 33e is greater than half the dimension L1 of the base end of the teeth 33b in the circumferential direction (D1>L1/2). In addition, in each segment core 33, the distance D1 is greater than the dimension L2 of the yoke 33a in the radial direction of the stator core 31 (hereinafter also simply referred to as the radial direction) (D1>L2). In addition, in each segment core 33, the distance D2 between the end of the teeth 33b in the circumferential direction and the first passage 33d is greater than half the dimension L1 (D2>L1/2). In addition, in each segment core 33, the distance D2 is greater than the dimension L2 (D2>L2). Furthermore, when viewed from the axial direction of the stator core 31, the second passage 33e is located on a straight line (center line CL in FIG. 2B) that passes through the center of the stator core 31 and the center of the teeth portion 33b. In FIG. 2B, the center line CL of the segment core 33 is parallel to the X-axis. That is, in explaining the segment core 33, a segment core 33 in which the center line CL is parallel to the X-axis is used as an example. The same is true for FIGS. 4 to 7.
　各セグメントコア３３の形状は、互いに同じ形状である。したがって、複数の第１通路３３ｄは、周方向において等間隔に配置される。また、複数の第２通路３３ｅは、周方向において等間隔に配置される。また、各セグメントコア３３において、固定子磁心３１の軸方向から見て、第１通路３３ｄの断面積は、第２通路３３ｅの断面積よりも大きい。なお、ここで第１通路３３ｄの断面積とは、固定子磁心３１の軸方向に垂直な面でセグメントコア３３を切ったときにできる第１通路３３ｄの切り口の面積をいう。また、第２通路３３ｅの断面積とは、固定子磁心３１の軸方向に垂直な面でセグメントコア３３を切ったときにできる第２通路３３ｅの切り口の面積をいうよって、固定子磁心３１の軸方向から見て、複数の第１通路３３ｄの断面積の総和である総面積ＧＡ１は、複数の第２通路３３ｅの断面積の総和である総面積ＧＡ２よりも大きい。ただし、総面積ＧＡ１は、総面積ＧＡ２よりも小さくてもよいし、総面積ＧＡ２と等しくてもよい。 The shape of each segment core 33 is the same as the others. Therefore, the multiple first passages 33d are arranged at equal intervals in the circumferential direction. Also, the multiple second passages 33e are arranged at equal intervals in the circumferential direction. Also, in each segment core 33, the cross-sectional area of the first passage 33d is larger than the cross-sectional area of the second passage 33e when viewed from the axial direction of the stator core 31. Note that the cross-sectional area of the first passage 33d here refers to the area of the cut edge of the first passage 33d created when the segment core 33 is cut on a plane perpendicular to the axial direction of the stator core 31. Also, the cross-sectional area of the second passage 33e refers to the area of the cut edge of the second passage 33e created when the segment core 33 is cut on a plane perpendicular to the axial direction of the stator core 31. Therefore, when viewed from the axial direction of the stator core 31, the total area GA1, which is the sum of the cross-sectional areas of the multiple first passages 33d, is larger than the total area GA2, which is the sum of the cross-sectional areas of the multiple second passages 33e. However, the total area GA1 may be smaller than the total area GA2 or may be equal to the total area GA2.
　固定子枠体４０は、開口４０ａを有する有底筒状に形成され、固定子３０を収容する。固定子枠体４０の底部と固定子３０との間には、第１空間Ｓ１が形成される。固定子枠体４０の内周面と固定子磁心３１の外周面との間には、第１通路３３ｄに対応する空間である第３空間Ｓ３が形成される。固定子枠体４０は、例えば、アルミニウム合金で構成されてもよい。 The stator frame 40 is formed in a bottomed cylindrical shape with an opening 40a, and houses the stator 30. A first space S1 is formed between the bottom of the stator frame 40 and the stator 30. A third space S3, which is a space corresponding to the first passage 33d, is formed between the inner peripheral surface of the stator frame 40 and the outer peripheral surface of the stator core 31. The stator frame 40 may be made of, for example, an aluminum alloy.
　印刷配線板５０は、巻装体３５と電気的に接続される。印刷配線板５０は、固定子枠体４０内において、固定子３０よりも開口４０に近くなるようにに配置される。印刷配線板５０は、環状（ドーナツ型形状）、扇型形状（円弧状）、Ｃ字状などに形成されていてもよい。印刷配線板５０は、中央に中空部を有し、この中空部に電動機１０の出力軸８０（後述する図３Ｂを参照）が挿通される。 The printed wiring board 50 is electrically connected to the winding body 35. The printed wiring board 50 is arranged within the stator frame 40 so as to be closer to the opening 40 than the stator 30. The printed wiring board 50 may be formed in an annular (donut-shaped), sector-shaped (arc-shaped), C-shaped, or other shape. The printed wiring board 50 has a hollow portion in the center, through which the output shaft 80 of the electric motor 10 (see FIG. 3B described below) is inserted.
　コネクタ６０は、印刷配線板５０に電気的に接続される。コネクタ６０には、印刷配線板５０を介して巻装体３５に電気的に接続される。コネクタ６０は、巻装体３５に電力を供給するための電源が接続される。コネクタ６０は、固定子枠体４０の開口４０ａの近傍に配置される。 The connector 60 is electrically connected to the printed wiring board 50. The connector 60 is electrically connected to the winding body 35 via the printed wiring board 50. A power source is connected to the connector 60 to supply power to the winding body 35. The connector 60 is disposed near the opening 40a of the stator frame body 40.
　充填樹脂７０は、第１空間Ｓ１、第２空間Ｓ２、および第３空間Ｓ３に充填される。充填樹脂７０は、例えばエポキシ樹脂であるが、これに限定されるものではない。充填樹脂７０は、フィラーを含む。充填樹脂７０のフィラー含有率は、例えば１０重量％以上、５０重量％以下である。 The filling resin 70 is filled into the first space S1, the second space S2, and the third space S3. The filling resin 70 is, for example, an epoxy resin, but is not limited to this. The filling resin 70 contains a filler. The filler content of the filling resin 70 is, for example, 10% by weight or more and 50% by weight or less.
　－電動機の構成－
　図３Ａは、実施形態１の電動機１０を模式的に示す平面図である。図３Ｂは、実施形態１の電動機１０を模式的に示す正面図である。図３Ａおよび図３Ｂに示すように、電動機１０は、上述の固定子構成体２０の他に、回転子、出力軸８０、一対の軸受、およびブラケットなどの各構成要素を備える。なお、回転子、一対の軸受、およびブラケットについては、図示を省略する。出力軸８０を有する回転子は、固定子構成体２０の内部空間に配置される。出力軸８０の両端は、一対の軸受によって回転可能に支持される。一方の軸受の外輪側は、ブラケットの収容部に固定される。他方の軸受の外輪側は、固定子枠体４０の底部の収容部に固定される。 -Motor configuration-
FIG. 3A is a plan view showing the electric motor 10 of the first embodiment. FIG. 3B is a front view showing the electric motor 10 of the first embodiment. As shown in FIG. 3A and FIG. 3B, the electric motor 10 includes components such as a rotor, an output shaft 80, a pair of bearings, and a bracket in addition to the stator assembly 20 described above. The rotor, the pair of bearings, and the bracket are not shown. The rotor having the output shaft 80 is disposed in the internal space of the stator assembly 20. Both ends of the output shaft 80 are rotatably supported by the pair of bearings. The outer ring side of one of the bearings is fixed to the housing of the bracket. The outer ring side of the other bearing is fixed to the housing at the bottom of the stator frame 40.
　－固定子構成体の製造方法－
　次に、上述の固定子構成体２０を製造する方法について、簡潔に説明する。固定子構成体の製造方法は、準備工程と、挿入工程と、注入工程と、硬化工程とを備える。 - Manufacturing method of stator assembly -
Next, a brief description will be given of a method for manufacturing the above-mentioned stator assembly 20. The manufacturing method for the stator assembly includes a preparation step, an insertion step, an injection step, and a curing step.
　準備工程では、上述の固定子３０および上述の固定子枠体４０を準備する。 In the preparation process, the above-mentioned stator 30 and the above-mentioned stator frame 40 are prepared.
　挿入工程では、固定子枠体４０の内部に固定子３０を挿入する。挿入の方法として、例えば焼き嵌めや圧入などを採用すればよい。 In the insertion process, the stator 30 is inserted into the stator frame 40. The insertion method may be, for example, shrink fitting or press fitting.
　注入工程では、固定子枠体４０をその開口４０ａが上方を向くように配置した状態で、各第１通路３３ｄを介して、第１空間Ｓ１、第２空間Ｓ２、および第３空間Ｓ３に液状の充填樹脂７０を注入する。このとき、各空間（特に、第１空間Ｓ１）に存在していた空気の少なくとも一部が、注入される充填樹脂７０に押され、第２通路３３ｅを介して外部に抜け得る。 In the injection process, the stator frame 40 is positioned so that its opening 40a faces upward, and liquid filling resin 70 is injected into the first space S1, the second space S2, and the third space S3 through each first passage 33d. At this time, at least a portion of the air present in each space (particularly the first space S1) is pushed by the injected filling resin 70 and can escape to the outside through the second passage 33e.
　硬化工程では、固定子枠体４０をその開口４０ａが上方を向くように配置したまま、液状の充填樹脂７０を硬化させる。 In the curing process, the liquid filling resin 70 is cured while the stator frame 40 is positioned with its opening 40a facing upward.
　《実施形態１の変形例》
　本開示の実施形態１の変形例について説明する。本変形例の固定子構成体２０は、第２通路３３ｅの数が上記実施形態１と異なる。以下、上記実施形態１と異なる点について主に説明する。 Variation of the First Embodiment
A modified example of the first embodiment of the present disclosure will be described. The stator assembly 20 of this modified example differs from the first embodiment in the number of second passages 33e. The following mainly describes the differences from the first embodiment.
　図４は、実施形態１の変形例のセグメントコア３３を概略的に示す平面図である。図４に示すように、各セグメントコア３３は、複数（この例では、２つ）の第２通路３３ｅを有する。各第２通路３３ｅは、それを有するセグメントコア３３において、第１通路３３ｄよりも内周寄り（あるいは、ティース部３３ｂ側）に設けられる。各第２通路３３ｅは、それを有するセグメントコア３３を軸方向に貫通する円形の貫通孔である。２つの第２通路３３ｅは、中心線ＣＬに関して線対称に配置されてもよい。なお、第２通路３３ｅの数は、３つ以上であってもよい。 FIG. 4 is a plan view showing a schematic diagram of a segment core 33 according to a modified example of the first embodiment. As shown in FIG. 4, each segment core 33 has a plurality of second passages 33e (two in this example). Each second passage 33e is provided closer to the inner periphery (or closer to the teeth portion 33b) than the first passages 33d in the segment core 33 having it. Each second passage 33e is a circular through hole that axially passes through the segment core 33 having it. The two second passages 33e may be arranged symmetrically with respect to the center line CL. The number of second passages 33e may be three or more.
　《実施形態２》
　本開示の実施形態２について説明する。本実施形態の固定子構成体２０は、第２通路３３ｅの形状が上記実施形態１と異なる。以下、上記実施形態１と異なる点について主に説明する。 Second Embodiment
A second embodiment of the present disclosure will be described. The stator assembly 20 of this embodiment differs from the first embodiment in the shape of the second passages 33e. The following mainly describes the differences from the first embodiment.
　図５は、実施形態２のセグメントコア３３を概略的に示す平面図である。図５に示すように、第２通路３３ｅは、矩形状、特に正方形状になっている。矩形における４つの角部は、尖った形状（あるいは、角張った形状）になっている。矩形における内周側の２つの辺は、ヨーク部３３ａとティース部３３ｂの間における主磁路に沿って延びている。換言すると、矩形における内周側の２つの辺は、ティース部３３ｂが延びる方向に対して所定の角度（この例では、４５°）で交差する方向に延びている。 FIG. 5 is a plan view that shows a schematic diagram of the segment core 33 of the second embodiment. As shown in FIG. 5, the second passage 33e is rectangular, and in particular square. The four corners of the rectangle are sharp (or angular). The two inner sides of the rectangle extend along the main magnetic path between the yoke portion 33a and the teeth portion 33b. In other words, the two inner sides of the rectangle extend in a direction that intersects with the direction in which the teeth portion 33b extends at a predetermined angle (45° in this example).
　《実施形態２の変形例》
　本開示の実施形態２の変形例について説明する。本変形例の固定子構成体２０は、第２通路３３ｅの形状が上記実施形態２と異なる。以下、上記実施形態２と異なる点について主に説明する。 Variation of the Second Embodiment
A modified example of the second embodiment of the present disclosure will be described. The stator assembly 20 of this modified example differs from the second embodiment in the shape of the second passages 33e. The following mainly describes the differences from the second embodiment.
　図６は、実施形態２の変形例のセグメントコア３３を概略的に示す平面図である。図６に示すように、第２通路３３ｅは、実質的に矩形状、特に実質的な正方形状になっている。実質的な矩形におおける少なくとも１つの角部（この例では、４つの角部）は、丸みを帯びた形状（あるいは、Ｒ形状）になっている。 FIG. 6 is a plan view that shows a schematic diagram of a segment core 33 according to a modified example of the second embodiment. As shown in FIG. 6, the second passage 33e has a substantially rectangular shape, in particular a substantially square shape. At least one corner of the substantially rectangular shape (four corners in this example) has a rounded shape (or an R shape).
　《実施形態３》
　本開示の実施形態３について説明する。本実施形態の固定子構成体２０は、第１通路３３ｄの構成が上記実施形態１と異なる。以下、上記実施形態１と異なる点について主に説明する。 Third Embodiment
A third embodiment of the present disclosure will be described. The stator assembly 20 of this embodiment differs from the first embodiment in the configuration of the first passage 33d. The following mainly describes the differences from the first embodiment.
　図７は、実施形態３のセグメントコア３３を概略的に示す平面図である。図７に示すように、第１通路３３ｄは、固定子磁心３１を軸方向に貫通する円形の貫通孔である。本実施形態では、固定子磁心３１の軸方向から見て、第１通路３３ｄの断面積と、第２通路３３ｅの断面積とは互いに等しい。しかしながら、両者の面積は、互いに異なってもよい。 FIG. 7 is a plan view that shows a schematic diagram of the segment core 33 of the third embodiment. As shown in FIG. 7, the first passage 33d is a circular through hole that passes through the stator core 31 in the axial direction. In this embodiment, the cross-sectional area of the first passage 33d and the cross-sectional area of the second passage 33e are equal to each other when viewed from the axial direction of the stator core 31. However, the areas of the two passages may be different from each other.
　《まとめ》
　以上に述べた、本開示に係る固定子構成体２０および電動機１０について、以下にまとめる。 "summary"
The stator assembly 20 and the electric motor 10 according to the present disclosure described above will be summarized below.
　（固定子構成体）
　本開示に係る固定子構成体２０は、固定子３０と、固定子枠体４０と、充填樹脂７０とを備える。 (Stator Component)
The stator assembly 20 according to the present disclosure includes a stator 30, a stator frame 40, and a filling resin 70.
　固定子３０は、バックヨーク部３２および複数のティース部３３ｂを含む固定子磁心３１と、各ティース部３３ｂを覆うインシュレータ３４と、インシュレータ３４に巻回された巻装体３５とを有する。隣り合う巻装体３５の間には、第２空間Ｓ２が形成される。 The stator 30 has a stator core 31 including a back yoke portion 32 and a plurality of teeth 33b, an insulator 34 covering each tooth 33b, and a winding body 35 wound around the insulator 34. A second space S2 is formed between adjacent winding bodies 35.
　固定子磁心３１において、バックヨーク部３２は、略円筒状に形成されてもよく、各ティース部３３ｂは、バックヨーク部３２から径方向内側に突出していてもよい。バックヨーク部３２は、分割型でも一体型でもよい。固定子磁心３１は、多数枚の電磁鋼板を積層して構成されてもよい。インシュレータ３４は、絶縁性の樹脂材料で構成されてもよい。巻装体３５は、絶縁被膜を有する絶縁電線で構成されてもよい。巻装体３５は、集中巻方式で巻回されてもよいし、分布巻方式で巻回されてもよい。 In the stator core 31, the back yoke portion 32 may be formed in a generally cylindrical shape, and each tooth portion 33b may protrude radially inward from the back yoke portion 32. The back yoke portion 32 may be of a split type or an integrated type. The stator core 31 may be formed by stacking a number of electromagnetic steel plates. The insulator 34 may be made of an insulating resin material. The winding body 35 may be made of an insulated electric wire having an insulating coating. The winding body 35 may be wound using a concentrated winding method or a distributed winding method.
　固定子枠体４０は、開口４０ａを有する有底筒状に形成され、固定子３０を収容する。固定子枠体４０の底部と固定子３０との間には、第１空間Ｓ１が形成される。固定子枠体４０の内周面と固定子磁心３１の外周面との間には、第３空間Ｓ３が形成されてもよい。固定子枠体４０は、熱伝導率の高い材料、例えばアルミニウムまたはアルミニウム合金で構成されていてもよい。固定子枠体４０の構成材料の熱伝導率は、固定子磁心３１の構成材料の熱伝導率よりも高くてもよい。 The stator frame 40 is formed in a bottomed cylindrical shape with an opening 40a, and houses the stator 30. A first space S1 is formed between the bottom of the stator frame 40 and the stator 30. A third space S3 may be formed between the inner peripheral surface of the stator frame 40 and the outer peripheral surface of the stator core 31. The stator frame 40 may be made of a material with high thermal conductivity, such as aluminum or an aluminum alloy. The thermal conductivity of the material constituting the stator frame 40 may be higher than the thermal conductivity of the material constituting the stator core 31.
　充填樹脂７０は、第１空間Ｓ１および第２空間Ｓ２に充填される。第３空間Ｓ３が存在する場合、充填樹脂は、第３空間Ｓ３にも充填され得る。充填樹脂７０は、通常、複数成分を含む樹脂組成物であり、エポキシ樹脂、フェノール樹脂、ポリエステル樹脂、アクリル樹脂、またはポリウレタン樹脂などを含んでもよい。充填樹脂７０は、フィラーを含んでもよい。フィラーとしては、無機粒子が望ましく、例えば水酸化アルミニウムを用い得る。充填樹脂７０のフィラー含有率は、１０重量％以上、５０重量％以下であってもよい。充填樹脂７０の熱伝導率は、巻装体３５を構成する絶縁電線が有する絶縁被膜の構成材料の熱伝導率よりも高くてもよい。充填樹脂７０の曲げ弾性率は、固定子枠体４０の構成材料の曲げ弾性率よりも低くてもよい。 The filling resin 70 is filled into the first space S1 and the second space S2. If the third space S3 exists, the filling resin may also be filled into the third space S3. The filling resin 70 is usually a resin composition containing multiple components, and may include epoxy resin, phenol resin, polyester resin, acrylic resin, or polyurethane resin. The filling resin 70 may include a filler. As the filler, inorganic particles are preferable, and aluminum hydroxide may be used, for example. The filler content of the filling resin 70 may be 10% by weight or more and 50% by weight or less. The thermal conductivity of the filling resin 70 may be higher than the thermal conductivity of the constituent material of the insulating coating of the insulated wire that constitutes the winding body 35. The bending modulus of the filling resin 70 may be lower than the bending modulus of the constituent material of the stator frame body 40.
　上記固定子磁心３１は、少なくとも１つの第１通路３３ｄと、少なくとも１つの第２通路３３ｅと、を有する。第１通路３３ｄは、固定子磁心３１の軸方向一端および軸方向他端の各々に開口している。第１通路３３ｄは、充填樹脂７０の充填時に、固定子磁心３１の軸方向の一方側と他方側を連通させてもよい。第２通路３３ｅは、第１通路３３ｄよりも内周寄りに設けられる。第２通路３３ｅは、固定子磁心３１の軸方向一端および軸方向他端の各々に開口している。第２通路３３ｅは、充填樹脂７０の充填時に、固定子磁心３１の軸方向の一方側と他方側を連通させてもよい。第１通路３３ｄおよび第２通路３３ｅの形状は特に限定されず、例えば、各通路が固定子磁心３１の軸方向に沿って延びていてもよいし、各通路が当該軸方向に対して斜めに延びていてもよい。第１通路３３ｄおよび第２通路３３ｅの開口部の形状も特に限定されず、例えば、円形、楕円形、矩形、多角形などであってもよい。 The stator core 31 has at least one first passage 33d and at least one second passage 33e. The first passage 33d opens at each of the axial end and the other axial end of the stator core 31. The first passage 33d may connect one axial side and the other axial side of the stator core 31 when the filled resin 70 is filled. The second passage 33e is provided closer to the inner circumference than the first passage 33d. The second passage 33e opens at each of the axial end and the other axial end of the stator core 31. The second passage 33e may connect one axial side and the other axial side of the stator core 31 when the filled resin 70 is filled. The shapes of the first passage 33d and the second passage 33e are not particularly limited, and for example, each passage may extend along the axial direction of the stator core 31, or each passage may extend obliquely with respect to the axial direction. The shape of the openings of the first passage 33d and the second passage 33e is not particularly limited and may be, for example, circular, elliptical, rectangular, polygonal, etc.
　このような第１通路３３ｄおよび第２通路３３ｅを用いて液状の充填樹脂７０を注入する場合、両通路の一方を充填樹脂７０の注入路として用いると共に、両通路の他方を空気抜き孔として用いることができる。例えば、各第１通路３３ｄを充填樹脂７０の注入路として用いる一方、各第２通路３３ｅを空気抜き孔として用いることが考えられる。ここで、注入路として用いる第１通路３３ｄまたは第２通路３３ｅでは、少なくとも一部に充填樹脂７０が充填される。一方、空気抜き孔として用いられる第２通路３３ｅまたは第１通路３３ｄでは、少なくとも一部に充填樹脂７０が充填されてもされなくてもよい。ただし、固定子構成体２０の放熱性を高める観点から、後者の少なくとも一部に充填樹脂７０が充填されることが好ましい。 When the liquid filling resin 70 is injected using the first passage 33d and the second passage 33e, one of the two passages can be used as an injection path for the filling resin 70, and the other can be used as an air vent hole. For example, it is possible to use each first passage 33d as an injection path for the filling resin 70, while using each second passage 33e as an air vent hole. Here, the first passage 33d or the second passage 33e used as an injection path is at least partially filled with the filling resin 70. On the other hand, the second passage 33e or the first passage 33d used as an air vent hole may or may not be at least partially filled with the filling resin 70. However, from the viewpoint of improving the heat dissipation of the stator structure 20, it is preferable that at least a portion of the latter is filled with the filling resin 70.
　液状の充填樹脂７０は、固定子磁心３１を固定子枠体４０に収容した状態で注入される。例えば、液状の充填樹脂７０は、固定子枠体４０をその開口４０ａが上方を向くように配置し、かつ固定子磁心３１をその軸方向が鉛直方向に沿うように配置した状態で、各第１通路３３ｄを介して上方から注入されてもよい。この場合、例えば、液状の充填樹脂７０は、各第１通路３３ｄを通過して、第１空間Ｓ１にまず充填され、その後、第２空間Ｓ２に充填され得る。この充填に際しては、各空間（特に、第１空間Ｓ１）に存在していた空気が、各第２通路３３ｅを介して上方へ抜け得るので、充填樹脂７０の充填率を高めることができる。また、このような充填方法によると、液状の充填樹脂７０が漏れにくい。なぜなら、液状の充填樹脂７０の充填の完了時における充填樹脂７０の液面高さが、流入路である第１通路３３ｄ（または、第２通路３３ｅ）の入口の高さよりも低いためである。液状の充填樹脂７０は、固定子磁心３１をその軸方向が鉛直方向に沿うように配置したままで硬化させればよい。 The liquid filling resin 70 is injected while the stator core 31 is housed in the stator frame 40. For example, the liquid filling resin 70 may be injected from above through each first passage 33d with the stator frame 40 arranged with its opening 40a facing upward and the stator core 31 arranged with its axial direction aligned vertically. In this case, for example, the liquid filling resin 70 may pass through each first passage 33d and first fill the first space S1, and then fill the second space S2. During this filling, the air present in each space (especially the first space S1) can escape upward through each second passage 33e, thereby increasing the filling rate of the filling resin 70. In addition, with this filling method, the liquid filling resin 70 is less likely to leak. This is because the liquid level of the filled resin 70 when the filling of the liquid filled resin 70 is completed is lower than the height of the inlet of the first passage 33d (or the second passage 33e), which is the inlet passage. The liquid filled resin 70 can be hardened while the stator core 31 is positioned so that its axial direction is aligned vertically.
　第１通路３３ｄは、固定子磁心３１の外周面に設けられた凹部、または固定子磁心３１をその軸方向に貫通する貫通孔であってもよい。第２通路３３ｅは、固定子磁心３１を軸方向に貫通する貫通孔であってもよい。このような第１通路３３ｄおよび第２通路３３ｅは、容易に形成することが可能である。 The first passage 33d may be a recess provided on the outer peripheral surface of the stator core 31, or a through hole that passes through the stator core 31 in the axial direction. The second passage 33e may be a through hole that passes through the stator core 31 in the axial direction. Such first passage 33d and second passage 33e can be easily formed.
　固定子磁心３１の周方向におけるティース部３３ｂの端部と、第２通路３３ｅとの間の距離Ｄ１（例えば、最短距離）は、ティース部３３ｂの当該周方向における基端部の寸法の半分よりも大きくてもよい。第２通路３３ｅは、ティース部３３ｂの基端部よりも外周寄りに（あるいは、バックヨーク部３２に）設けられてもよい。この構成によると、当該周方向におけるティース部３３ｂの端部と第２通路３３ｅとの間に十分な距離が確保され、バックヨーク部３２とティース部３３ｂとを結ぶ磁路における磁気抵抗を抑制することができる。 The distance D1 (e.g., the shortest distance) between the end of the teeth 33b in the circumferential direction of the stator core 31 and the second passage 33e may be greater than half the dimension of the base end of the teeth 33b in the circumferential direction. The second passage 33e may be provided closer to the outer periphery than the base end of the teeth 33b (or in the back yoke portion 32). With this configuration, a sufficient distance is ensured between the end of the teeth 33b in the circumferential direction and the second passage 33e, making it possible to suppress magnetic resistance in the magnetic path connecting the back yoke portion 32 and the teeth 33b.
　固定子磁心の周方向におけるティース部の端部と、第２通路との間の距離（例えば、最短距離）は、固定子磁心の径方向におけるバックヨーク部の寸法よりも大きくてもよい。第２通路は、ティース部の基端部よりも外周寄りに（あるいは、バックヨーク部に）設けられてもよい。この構成によると、当該周方向におけるティース部の端部と第２通路との間に十分な距離が確保され、バックヨーク部とティース部とを結ぶ磁路における磁気抵抗を抑制することができる。 The distance (e.g., the shortest distance) between the end of the teeth in the circumferential direction of the stator core and the second passage may be greater than the dimension of the back yoke in the radial direction of the stator core. The second passage may be provided closer to the outer periphery than the base end of the teeth (or in the back yoke). With this configuration, a sufficient distance is ensured between the end of the teeth in the circumferential direction and the second passage, making it possible to suppress magnetic resistance in the magnetic path connecting the back yoke and the teeth.
　固定子磁心３１の周方向におけるティース部３３ｂの端部と、第１通路３３ｄとの間の距離Ｄ２（例えば、最短距離）は、ティース部３３ｂの当該周方向における基端部の寸法の半分よりも大きくてもよい。第１通路３３ｄは、ティース部３３ｂの基端部よりも外周寄りに（あるいは、バックヨーク部３２に）設けられてもよい。この構成によると、当該周方向におけるティース部３３ｂの端部と第１通路３３ｄとの間に十分な距離が確保され、バックヨーク部３２とティース部３３ｂとを結ぶ磁路における磁気抵抗を抑制することができる。 The distance D2 (e.g., the shortest distance) between the end of the teeth 33b in the circumferential direction of the stator core 31 and the first passage 33d may be greater than half the dimension of the base end of the teeth 33b in the circumferential direction. The first passage 33d may be provided closer to the outer periphery than the base end of the teeth 33b (or in the back yoke portion 32). With this configuration, a sufficient distance is ensured between the end of the teeth 33b in the circumferential direction and the first passage 33d, and magnetic resistance in the magnetic path connecting the back yoke portion 32 and the teeth 33b can be suppressed.
　固定子磁心３１の周方向におけるティース部３３ｂの端部と、第１通路３３ｄとの間の距離Ｄ２は、固定子磁心３１の径方向におけるバックヨーク部３２の寸法よりも大きくてもよい。第１通路３３ｄは、ティース部３３ｂの基端部よりも外周寄りに（あるいは、バックヨーク部３２に）設けられてもよい。この構成によると、当該周方向におけるティース部３３ｂの端部と第１通路３３ｄとの間に十分な距離が確保され、バックヨーク部３２とティース部３３ｂとを結ぶ磁路における磁気抵抗を抑制することができる。 The distance D2 between the end of the teeth 33b in the circumferential direction of the stator core 31 and the first passage 33d may be greater than the dimension of the back yoke 32 in the radial direction of the stator core 31. The first passage 33d may be provided closer to the outer periphery than the base end of the teeth 33b (or in the back yoke 32). With this configuration, a sufficient distance is ensured between the end of the teeth 33b in the circumferential direction and the first passage 33d, and magnetic resistance in the magnetic path connecting the back yoke 32 and the teeth 33b can be suppressed.
　固定子磁心３１の軸方向から見て、第２通路３３ｅは、固定子磁心３１の中心とティース部３３ｂの中心とを通る直線上に位置してもよい。この構成によると、固定子磁心３１の周方向におけるティース部３３ｂの一端部と第２通路３３ｅとの間の距離、ならびに当該周方向におけるティース部３３ｂの他端部と第２通路３３ｅとの間の距離が実質的に等しくなり、ティース部３３ｂの近くに大きな磁気抵抗が形成されにくい。なお、第２通路３３ｅが、両中心を通る直線上に位置するとは、固定子磁心３１の軸方向から見て、第２通路３３ｅの中心が当該直線上に位置する場合のみでなく、第２通路３３ｅの少なくとも一部が当該直線と重なる場合をも含む。 When viewed from the axial direction of the stator core 31, the second passage 33e may be located on a straight line passing through the center of the stator core 31 and the center of the teeth 33b. With this configuration, the distance between one end of the teeth 33b in the circumferential direction of the stator core 31 and the second passage 33e, and the distance between the other end of the teeth 33b in the circumferential direction and the second passage 33e, are substantially equal, making it difficult for large magnetic resistance to form near the teeth 33b. Note that when the second passage 33e is located on a straight line passing through both centers, this includes not only the case where the center of the second passage 33e is located on the straight line when viewed from the axial direction of the stator core 31, but also the case where at least a part of the second passage 33e overlaps with the straight line.
　第１通路３３ｄは、固定子磁心３１の周方向に間隔をおいて複数設けられてもよい。複数の第１通路３３ｄは、液状の充填樹脂７０の注入路として用いられてもよい。この構成によると、固定子磁心３１の周方向における複数箇所から充填樹脂７０を注入することで、充填樹脂７０の充填率をより一層高めることができる。 The first passages 33d may be provided at intervals in the circumferential direction of the stator core 31. The multiple first passages 33d may be used as injection paths for the liquid filling resin 70. With this configuration, the filling resin 70 can be injected from multiple locations in the circumferential direction of the stator core 31, thereby further increasing the filling rate of the filling resin 70.
　複数の第１通路３３ｄは、固定子磁心３１の周方向において等間隔に配置されてもよい。この構成によると、固定子磁心３１の磁気回路に対称性を付与することができる。具体的には、固定子磁心３１の磁気回路を、固定子磁心３１の中心に関して回転対称に近づけることができる。 The multiple first passages 33d may be arranged at equal intervals in the circumferential direction of the stator core 31. This configuration can impart symmetry to the magnetic circuit of the stator core 31. Specifically, the magnetic circuit of the stator core 31 can be made closer to rotational symmetry with respect to the center of the stator core 31.
　第２通路３３ｅは、固定子磁心３１の周方向に間隔をおいて複数設けられてもよい。複数の第２通路３３ｅは、充填樹脂７０の注入時における空気抜き孔として用いられてもよい。この構成によると、固定子磁心３１の周方向における複数箇所から空気が抜けるので、充填樹脂７０の充填率をより一層高めることができる。 The second passages 33e may be provided at intervals in the circumferential direction of the stator core 31. The second passages 33e may be used as air vent holes when injecting the filling resin 70. With this configuration, air is released from multiple locations in the circumferential direction of the stator core 31, so the filling rate of the filling resin 70 can be further increased.
　複数の第２通路３３ｅは、固定子磁心３１の周方向において等間隔に配置されてもよい。この構成によると、固定子磁心３１の磁気回路に対称性を付与することができる。具体的には、固定子磁心３１の磁気回路を、固定子磁心３１の中心に関して回転対称に近づけることができる。 The second passages 33e may be arranged at equal intervals in the circumferential direction of the stator core 31. This configuration can impart symmetry to the magnetic circuit of the stator core 31. Specifically, the magnetic circuit of the stator core 31 can be made to approach rotational symmetry with respect to the center of the stator core 31.
　少なくとも１つの第１通路３３ｄと、少なくとも１つの第２通路３３ｅとのうち、固定子磁心３１の軸方向から見て総面積が大きい方が、液状の充填樹脂７０の注入路として用いられてもよい。両者のうち、固定子磁心３１の軸方向から見て総面積が小さい方が、充填樹脂７０の注入時における空気抜き孔として用いられてもよい。この構成によると、充填樹脂７０の充填率をより一層高めることができる。 Of the at least one first passage 33d and the at least one second passage 33e, the one with the larger total area as viewed in the axial direction of the stator core 31 may be used as an injection path for the liquid filling resin 70. Of the two, the one with the smaller total area as viewed in the axial direction of the stator core 31 may be used as an air vent hole when injecting the filling resin 70. With this configuration, the filling rate of the filling resin 70 can be further increased.
　第１通路３３ｄの数と第２通路３３ｅの数とは、互いに同じであってもよいし異なってもよい。前者の場合、固定子磁心３１の周方向において、第１通路３３ｄの位置（角度位置）と第２通路３３ｅの位置（角度位置）とは、互いに同じであってもよいし異なってもよい。 The number of first passages 33d and the number of second passages 33e may be the same or different. In the former case, the positions (angular positions) of the first passages 33d and the positions (angular positions) of the second passages 33e in the circumferential direction of the stator core 31 may be the same or different.
　固定子磁心３１の軸方向から見て、第２通路３３ｅの形状は、円形、楕円形、または多角形であってもよい。第２通路３３ｅが多角形状である場合、当該多角形を構成する少なくとも１つの辺が、固定子磁心３１の主磁路の磁気抵抗を抑える観点から、当該主磁路に沿って延びていることが好ましい。 When viewed from the axial direction of the stator core 31, the shape of the second passage 33e may be circular, elliptical, or polygonal. If the second passage 33e is polygonal, it is preferable that at least one side constituting the polygon extends along the main magnetic path of the stator core 31 from the viewpoint of suppressing the magnetic resistance of the main magnetic path.
　（電動機）
　本開示に係る電動機１０は、上述のいずれかの固定子構成体２０を備える。電動機１０は、さらに、回転子、出力軸８０（回転軸）、一対の軸受、ブラケットなどの構成要素を備えてもよい。出力軸８０を有する回転子は、固定子構成体２０の内部空間に配置されてもよい。出力軸８０の両端は、一対の軸受によって回転可能に支持されてもよい。一方の軸受の外輪側は、ブラケットの収容部に固定されてもよい。他方の軸受の外輪側は、固定子枠体４０の底部の収容部に固定されてもよい。 (Electric motor)
The electric motor 10 according to the present disclosure includes any one of the stator components 20 described above. The electric motor 10 may further include components such as a rotor, an output shaft 80 (rotating shaft), a pair of bearings, and a bracket. The rotor having the output shaft 80 may be disposed in the internal space of the stator component 20. Both ends of the output shaft 80 may be rotatably supported by a pair of bearings. The outer ring side of one of the bearings may be fixed to a housing portion of the bracket. The outer ring side of the other bearing may be fixed to a housing portion at the bottom of the stator frame 40.
　以上のように、本開示によれば、液状の充填樹脂７０を充填する際に、充填樹脂７０が漏れるのを抑止することができる。さらに、本開示によれば、充填樹脂７０の漏れに起因する電動機１０の外観悪化を回避することができる。 As described above, according to the present disclosure, when filling the liquid filling resin 70, leakage of the filling resin 70 can be prevented. Furthermore, according to the present disclosure, deterioration of the appearance of the electric motor 10 due to leakage of the filling resin 70 can be avoided.
　《付記》
　以上の実施形態の記載により、下記の技術が開示される。 Additional Notes
The above description of the embodiments discloses the following techniques.
　（技術１）
　バックヨーク部と複数のティース部を含む固定子磁心、各前記ティース部を覆うインシュレータ、および前記インシュレータに巻回された巻装体を有する固定子と、
　開口を有する有底筒状に形成され、前記固定子を収容する固定子枠体と、
　前記固定子枠体の底部と前記固定子との間の第１空間および隣り合う前記巻装体の間の第２空間に充填される充填樹脂と、を備え、
　前記固定子磁心は、少なくとも１つの第１通路と、前記第１通路よりも内周寄りに設けられた少なくとも１つの第２通路と、を有し、
　前記第１通路は、前記固定子磁心の軸方向一端および軸方向他端の各々に開口しており、
　前記第２通路は、前記固定子磁心の軸方向一端および軸方向他端の各々に開口している、固定子構成体。 (Technique 1)
a stator including a stator core including a back yoke portion and a plurality of teeth, an insulator covering each of the teeth, and a winding wound around the insulator;
a stator frame formed in a bottomed cylindrical shape having an opening and housing the stator;
a filling resin that is filled in a first space between a bottom of the stator frame and the stator and a second space between adjacent winding bodies,
the stator core has at least one first passage and at least one second passage provided closer to the inner periphery than the first passage,
the first passage is open to each of one axial end and the other axial end of the stator core,
A stator structure, wherein the second passage is open to each of one axial end and the other axial end of the stator core.
　（技術２）
　前記第１通路は、前記固定子磁心の外周面に設けられた凹部、または前記固定子磁心をその軸方向に貫通する貫通孔であり、
　前記第２通路は、前記固定子磁心を前記軸方向に貫通する貫通孔である、技術１に記載の固定子構成体。 (Technique 2)
the first passage is a recess provided in an outer peripheral surface of the stator core, or a through hole passing through the stator core in an axial direction thereof,
The stator structure according to claim 1, wherein the second passage is a through hole penetrating the stator core in the axial direction.
　（技術３）
　前記固定子磁心の周方向における前記ティース部の端部と、前記第２通路との間の距離は、前記ティース部の前記周方向における基端部の寸法の半分よりも大きい、技術１または２に記載の固定子構成体。 (Technique 3)
3. The stator structure according to claim 1, wherein a distance between an end of the teeth portion in a circumferential direction of the stator core and the second passage is greater than half a dimension of a base end of the teeth portion in the circumferential direction.
　（技術４）
　前記固定子磁心の周方向における前記ティース部の端部と、前記第２通路との間の距離は、前記固定子磁心の径方向における前記バックヨーク部の寸法よりも大きい、技術１～３のいずれか１つに記載の固定子構成体。 (Technique 4)
The stator structure according to any one of techniques 1 to 3, wherein a distance between an end of the teeth portion and the second passage in a circumferential direction of the stator core is larger than a dimension of the back yoke portion in a radial direction of the stator core.
　（技術５）
　前記固定子磁心の周方向における前記ティース部の端部と、前記第１通路との間の距離は、前記ティース部の前記周方向における基端部の寸法の半分よりも大きい、技術１～４のいずれか１つに記載の固定子構成体。 (Technique 5)
The stator structure according to any one of techniques 1 to 4, wherein a distance between an end of the teeth portion in a circumferential direction of the stator core and the first passage is greater than half a dimension of a base end of the teeth portion in the circumferential direction.
　（技術６）
　前記固定子磁心の周方向における前記ティース部の端部と、前記第１通路との間の距離は、前記固定子磁心の径方向における前記バックヨーク部の寸法よりも大きい、技術１～５のいずれか１つに記載の固定子構成体。 (Technique 6)
The stator structure according to any one of techniques 1 to 5, wherein a distance between an end of the teeth portion and the first passage in a circumferential direction of the stator core is larger than a dimension of the back yoke portion in a radial direction of the stator core.
　（技術７）
　前記固定子磁心の軸方向から見て、前記第２通路は、前記固定子磁心の中心と前記ティース部の中心とを通る直線上に位置する、技術１～６のいずれか１つに記載の固定子構成体。 (Technique 7)
The stator structure according to any one of techniques 1 to 6, wherein, as viewed from the axial direction of the stator core, the second passage is located on a straight line passing through a center of the stator core and a center of the teeth portion.
　（技術８）
　前記第１通路は、前記固定子磁心の周方向に間隔をおいて複数設けられる、技術１～７のいずれか１つに記載の固定子構成体。 (Technique 8)
The stator assembly according to any one of claims 1 to 7, wherein the first passages are provided in a plurality of positions spaced apart from one another in a circumferential direction of the stator core.
　（技術９）
　前記複数の第１通路は、前記周方向において等間隔に配置される、技術８に記載の固定子構成体。 (Technique 9)
The stator structure according to claim 8, wherein the first passages are equally spaced in the circumferential direction.
　（技術１０）
　前記第２通路は、前記固定子磁心の周方向に間隔をおいて複数設けられる、技術１～９のいずれか１つに記載の固定子構成体。 (Technique 10)
The stator assembly according to any one of claims 1 to 9, wherein the second passages are provided in a plurality of positions spaced apart from one another in a circumferential direction of the stator core.
　（技術１１）
　前記複数の第２通路は、前記周方向において等間隔に配置される、技術１０に記載の固定子構成体。 (Technique 11)
The stator structure according to claim 10, wherein the second passages are arranged at equal intervals in the circumferential direction.
　（技術１２）
　技術１～１１のいずれか１つに記載の固定子構成体を備える電動機。 (Technique 12)
An electric motor comprising a stator assembly according to any one of techniques 1 to 11.
　本開示は、固定子構成体および電動機に利用できる。 This disclosure can be used in stator structures and electric motors.
１０：電動機
　２０：固定子構成体
　　３０：固定子
　　　３１：固定子磁心
　　　　３２：バックヨーク部
　　　　３３：セグメントコア
　　　　　３３ａ：ヨーク部
　　　　　３３ｂ：ティース部
　　　　　３３ｃ：鍔部
　　　　　３３ｄ：第１通路
　　　　　３３ｅ：第２通路
　　　３４：インシュレータ
　　　３５：巻装体
　　４０：固定子枠体
　　　４０ａ：開口
　　５０：印刷配線板
　　６０：コネクタ
　　７０：充填樹脂
　　　７０ａ：端面
　８０：出力軸
ＣＬ：中心線
Ｄ１：距離
Ｄ２：距離
Ｌ１：寸法
Ｌ２：寸法
Ｓ１：第１空間
Ｓ２：第２空間
Ｓ３：第３空間 10: Motor 20: Stator structure 30: Stator 31: Stator core 32: Back yoke portion 33: Segment core 33a: Yoke portion 33b: Teeth portion 33c: Flange portion 33d: First passage 33e: Second passage 34: Insulator 35: Winding body 40: Stator frame body 40a: Opening 50: Printed wiring board 60: Connector 70: Filling resin 70a: End face 80: Output shaft CL: Center line D1: Distance D2: Distance L1: Dimension L2: Dimension S1: First space S2: Second space S3: Third space

Claims (12)

  1. 　バックヨーク部と複数のティース部を含む固定子磁心、前記複数のティース部の各々を覆うインシュレータ、および前記インシュレータに巻回された巻装体を有する固定子と、
    　開口を有する有底筒状に形成され、前記固定子を収容する固定子枠体と、
    　前記固定子枠体の底部と前記固定子との間の第１空間および隣り合う前記巻装体の間の第２空間に充填される充填樹脂と、を備え、
    　前記固定子磁心は、少なくとも１つの第１通路と、前記第１通路よりも内周寄りに設けられた少なくとも１つの第２通路と、を有し、
    　前記第１通路は、前記固定子磁心の軸方向一端および軸方向他端の各々に開口しており、
    　前記第２通路は、前記固定子磁心の前記軸方向一端および前記軸方向他端の各々に開口している、固定子構成体。     a stator including a stator core including a back yoke portion and a plurality of teeth, an insulator covering each of the plurality of teeth, and a winding wound around the insulator;
    a stator frame formed in a bottomed cylindrical shape having an opening and housing the stator;
    a filling resin that is filled in a first space between a bottom of the stator frame and the stator and a second space between adjacent winding bodies,
    the stator core has at least one first passage and at least one second passage provided closer to the inner periphery than the first passage,
    the first passage is open to each of one axial end and the other axial end of the stator core,
    A stator structure, wherein the second passage is open to each of the one axial end and the other axial end of the stator core.
  2. 　前記第１通路は、前記固定子磁心の外周面に設けられた凹部、または前記固定子磁心をその軸方向に貫通する貫通孔であり、
    　前記第２通路は、前記固定子磁心を前記軸方向に貫通する貫通孔である、請求項１に記載の固定子構成体。     the first passage is a recess provided in an outer peripheral surface of the stator core, or a through hole passing through the stator core in an axial direction thereof,
    The stator structure according to claim 1 , wherein the second passage is a through hole passing through the stator core in the axial direction.
  3. 　前記固定子磁心の周方向における前記ティース部の端部と、前記第２通路との間の距離は、前記ティース部の前記周方向における基端部の寸法の半分よりも大きい、請求項１に記載の固定子構成体。 The stator structure of claim 1, wherein the distance between the end of the teeth in the circumferential direction of the stator core and the second passage is greater than half the dimension of the base end of the teeth in the circumferential direction.
  4. 　前記固定子磁心の周方向における前記ティース部の端部と、前記第２通路との間の距離は、前記固定子磁心の径方向における前記バックヨーク部の寸法よりも大きい、請求項１に記載の固定子構成体。 The stator structure of claim 1, wherein the distance between the end of the teeth portion in the circumferential direction of the stator core and the second passage is greater than the dimension of the back yoke portion in the radial direction of the stator core.
  5. 　前記固定子磁心の周方向における前記ティース部の端部と、前記第１通路との間の距離は、前記ティース部の前記周方向における基端部の寸法の半分よりも大きい、請求項１に記載の固定子構成体。 The stator structure of claim 1, wherein the distance between the end of the teeth in the circumferential direction of the stator core and the first passage is greater than half the dimension of the base end of the teeth in the circumferential direction.
  6. 　前記固定子磁心の周方向における前記ティース部の端部と、前記第１通路との間の距離は、前記固定子磁心の径方向における前記バックヨーク部の寸法よりも大きい、請求項１に記載の固定子構成体。 The stator structure of claim 1, wherein the distance between the end of the teeth portion in the circumferential direction of the stator core and the first passage is greater than the dimension of the back yoke portion in the radial direction of the stator core.
  7. 　前記固定子磁心の軸方向から見て、前記第２通路は、前記固定子磁心の中心と前記ティース部の中心とを通る直線上に位置する、請求項１に記載の固定子構成体。 The stator structure according to claim 1, wherein, when viewed in the axial direction of the stator core, the second passage is located on a straight line passing through the center of the stator core and the center of the teeth.
  8. 　前記第１通路は、前記固定子磁心の周方向に間隔をおいて複数設けられる、請求項１に記載の固定子構成体。 The stator structure according to claim 1, wherein the first passages are provided in a plurality of positions spaced apart from one another in the circumferential direction of the stator core.
  9. 　前記複数の第１通路は、前記周方向において等間隔に配置される、請求項８に記載の固定子構成体。 The stator structure according to claim 8, wherein the first passages are arranged at equal intervals in the circumferential direction.
  10. 　前記第２通路は、前記固定子磁心の周方向に間隔をおいて複数設けられる、請求項１に記載の固定子構成体。 The stator structure according to claim 1, wherein the second passages are provided in a plurality of locations spaced apart from one another in the circumferential direction of the stator core.
  11. 　前記複数の第２通路は、前記周方向において等間隔に配置される、請求項１０に記載の固定子構成体。 The stator structure according to claim 10, wherein the second passages are arranged at equal intervals in the circumferential direction.
  12. 　請求項１～１１のいずれか１項に記載の固定子構成体を備える電動機。 An electric motor equipped with a stator structure according to any one of claims 1 to 11.
PCT/JP2023/032155 2022-10-04 2023-09-01 Stator structure and electric machine WO2024075455A1 (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5519467U (en) * 1978-07-24 1980-02-07
JP2009213276A (en) * 2008-03-05 2009-09-17 Kayaba Ind Co Ltd Motor
JP2014075900A (en) * 2012-10-04 2014-04-24 Mitsubishi Electric Corp Rotary electric machine
JP2015097466A (en) * 2013-10-09 2015-05-21 株式会社三井ハイテック Laminated iron core and method of manufacturing the same
JP2016073109A (en) * 2014-09-30 2016-05-09 株式会社三井ハイテック Laminated core and manufacturing method thereof
JP2016163393A (en) * 2015-02-27 2016-09-05 パナソニックＩｐマネジメント株式会社 Stator structure, electric motor, device, manufacturing method for stator structure and manufacturing method for electric motor
JP2017099266A (en) * 2015-11-12 2017-06-01 ダイキン工業株式会社 Motor core and motor using the same, and compressor
JP2017216880A (en) * 2017-09-06 2017-12-07 株式会社三井ハイテック Manufacturing method for laminated iron-core
WO2019189529A1 (en) * 2018-03-30 2019-10-03 日本電産株式会社 Motor

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5519467U (en) * 1978-07-24 1980-02-07
JP2009213276A (en) * 2008-03-05 2009-09-17 Kayaba Ind Co Ltd Motor
JP2014075900A (en) * 2012-10-04 2014-04-24 Mitsubishi Electric Corp Rotary electric machine
JP2015097466A (en) * 2013-10-09 2015-05-21 株式会社三井ハイテック Laminated iron core and method of manufacturing the same
JP2016073109A (en) * 2014-09-30 2016-05-09 株式会社三井ハイテック Laminated core and manufacturing method thereof
JP2016163393A (en) * 2015-02-27 2016-09-05 パナソニックＩｐマネジメント株式会社 Stator structure, electric motor, device, manufacturing method for stator structure and manufacturing method for electric motor
JP2017099266A (en) * 2015-11-12 2017-06-01 ダイキン工業株式会社 Motor core and motor using the same, and compressor
JP2017216880A (en) * 2017-09-06 2017-12-07 株式会社三井ハイテック Manufacturing method for laminated iron-core
WO2019189529A1 (en) * 2018-03-30 2019-10-03 日本電産株式会社 Motor

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