WO2024247427A1 - 固定子およびそれを備えた電動機 - Google Patents

固定子およびそれを備えた電動機 Download PDF

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Publication number
WO2024247427A1
WO2024247427A1 PCT/JP2024/008418 JP2024008418W WO2024247427A1 WO 2024247427 A1 WO2024247427 A1 WO 2024247427A1 JP 2024008418 W JP2024008418 W JP 2024008418W WO 2024247427 A1 WO2024247427 A1 WO 2024247427A1
Authority
WO
WIPO (PCT)
Prior art keywords
split core
stator
insulating paper
insulator
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2024/008418
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English (en)
French (fr)
Japanese (ja)
Inventor
幸寛 小林
宜農 麻生
俊幸 玉村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to DE212024000220.8U priority Critical patent/DE212024000220U1/de
Priority to JP2025523277A priority patent/JPWO2024247427A1/ja
Publication of WO2024247427A1 publication Critical patent/WO2024247427A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/325—Windings characterised by the shape, form or construction of the insulation for windings on salient poles, such as claw-shaped poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation

Definitions

  • This disclosure relates to a stator and an electric motor equipped with the same.
  • Patent Document 1 a technique for insulating split cores and coils in electric motor stators using insulating paper is known (for example, Patent Document 1).
  • the stator in Patent Document 1 includes multiple split cores, a coil wound around the split cores, insulators interposed between the end faces of the split cores and the coils, and insulating paper interposed between the side faces of the split cores and the coils.
  • the insulating paper may fall over or move, preventing the assembly from proceeding smoothly.
  • the insulating paper is attached to the split core, and then the insulator is attached.
  • the insulator hits the insulating paper, causing the insulating paper to fall over or move.
  • One of the objectives of the present disclosure is to provide a stator and electric motor that can prevent the insulating paper from falling over or moving when the stator is assembled.
  • the stator includes a plurality of split cores, a coil wound around the split cores, an insulator interposed between an end face of the split cores and the coil, and insulating paper interposed between a side face of the split cores and the coil.
  • the insulating paper has a protruding portion that protrudes from the end face of the split cores in the axial direction of the stator.
  • the insulator has a retaining portion that extends in the axial direction and retains the insulating paper between the insulator and the side face of the split core. The retaining portion is longer in the axial direction than the protruding portion.
  • the electric motor includes the above-mentioned stator and a rotor disposed opposite the stator.
  • the stator disclosed herein and the electric motor equipped with it can prevent the insulating paper from collapsing or moving when assembling the stator.
  • FIG. 1 is a perspective view showing a split core and the like according to a first embodiment, illustrating a state in which insulating paper, an insulator, and a coil are assembled to the split core.
  • FIG. FIG. 2 is a perspective view showing the split core and the like of the first embodiment, illustrating a state in which insulating paper and an insulator are attached to the split core and the insulating paper is spread out.
  • FIG. 3 is an exploded perspective view showing the split core and the like of the first embodiment, with one of the insulators omitted.
  • FIG. 4 is a side view showing the split core and the like of the first embodiment, illustrating a state in which one of the insulators is in the middle of being attached to the split core.
  • FIG. 1 is a perspective view showing a split core and the like according to a first embodiment, illustrating a state in which insulating paper, an insulator, and a coil are assembled to the split core.
  • FIG. 2 is a perspective view showing the split
  • FIG. 5 is a perspective view showing the split core and the like of the second embodiment, illustrating a state in which insulating paper and an insulator are attached to the split core and the insulating paper is spread out.
  • FIG. 6 is a perspective view showing the split core and the like of the third embodiment, illustrating a state in which insulating paper and an insulator are attached to the split core and the insulating paper is spread out.
  • FIG. 7 is a perspective view showing the split core and the like of the fourth embodiment, illustrating a state in which insulating paper and an insulator are attached to the split core and the insulating paper is spread out.
  • the stator according to the present disclosure includes a plurality of split cores, a coil, an insulator, and insulating paper.
  • the stator may be configured by assembling the plurality of split cores into an annular shape.
  • Each of the multiple split cores may have teeth and yoke portions.
  • Each split core may be constructed by laminating multiple roughly T-shaped electromagnetic steel sheets, or may be constructed of a powder magnetic core.
  • the coil is wound around a split core.
  • the coil may be wound around the split core in a concentrated winding manner.
  • the coil may be constructed of enamel-coated copper wire.
  • the insulator is interposed between the end face of the split core and the coil.
  • the end face of the split core refers to the end face of the split core in the axial direction of the stator (hereinafter also simply referred to as the axial direction).
  • the insulator serves to electrically insulate the split core from the coil.
  • the insulator may be made of a material that contains an insulating resin material (e.g., polyethylene terephthalate).
  • the insulating paper is interposed between the side of the split core and the coil.
  • the side of the split core refers to the surface that connects the two end faces of the split core, and in particular refers to the side of the yoke portion and the teeth portion that faces the coil.
  • the insulating paper serves to electrically insulate the split core and the coil.
  • the insulating paper may be made of a material that contains an insulating resin material (e.g., polyethylene terephthalate).
  • the insulating paper has a protrusion that protrudes from the end face of the split core in the axial direction of the stator. This protrusion may or may not be folded to cover the coil end after winding the coil.
  • the insulator has a retaining portion extending in the axial direction.
  • the retaining portion retains the insulating paper between the retaining portion and the side surface of the split core.
  • the retaining portion may have a shape that conforms to the side surface of the split core.
  • the retaining portion may be a portion that protrudes in the axial direction from the main body portion of the insulator, with the portion of the insulator that abuts against the end surface of the split core being the main body portion of the insulator.
  • the holding portion of the insulator is longer in the axial direction than the protruding portion of the insulating paper. This makes it possible to prevent the insulating paper from falling over or moving when assembling each part to the split core. That is, when the insulating paper is attached to the split core, the protruding portion protrudes in the axial direction from the end face of the split core. When the insulator is then assembled, the tip of the holding portion, which is longer than the protruding portion, reaches the side of the split core before the main body of the insulator comes into contact with the protruding portion, and the insulating paper is held between the tip and the side of the split core.
  • the insulator can then be assembled to the split core with the insulating paper held between the holding portion and the side of the split core, thereby preventing the insulating paper from falling over or moving.
  • the holding portion functions as a guide for the axial movement of the insulator.
  • a pair of insulators may be provided for each split core.
  • the length of the holding portion may be less than half the length of the split core.
  • At least a portion of the retaining portion may extend away from the central region of the side of the teeth portion of the split core.
  • the central region of the side of the teeth portion is an area where the coil wound around the split core is likely to expand, and in this area, large stress can be generated in the coil when assembling multiple split cores into a ring shape.
  • there is no retaining portion in the central region and the force applied to the coil can be released, thereby preventing large stress from being generated in the coil.
  • the base end of the retaining portion may be rounded.
  • the base end of the retaining portion refers to the portion of the retaining portion that is close to the main body of the insulator. By rounding this base end, the desired shape can be easily obtained with the liquid resin material when the insulator is resin molded.
  • the roundness of the base end may have a radius of curvature of 0.5 mm or more.
  • the radius of curvature of the roundness of the base end may be half or less of the radial length of the teeth portion.
  • the retaining portion may extend along the central region of the side surface of the teeth portion of the split core. In this configuration, the retaining portion may extend only along the central region. This makes it possible to reduce the amount of resin material used in the insulator.
  • the electric motor according to the present disclosure includes the above-mentioned stator and a rotor disposed opposite the stator.
  • the rotor may have a rotor core and a permanent magnet.
  • the rotor core may be configured by laminating a plurality of electromagnetic steel sheets, or may be configured by a powder magnetic core.
  • the rotor may face the stator in the radial direction, or may face the stator in the axial direction.
  • the electric motor may be an inner rotor type electric motor, or may be an outer rotor type electric motor.
  • the stator of the present disclosure and the electric motor equipped with the same can prevent the insulating paper from collapsing or moving when assembling the stator by providing a long axial holding portion on the insulator.
  • Fig. 1 is a perspective view showing a split core 10 of this embodiment, and shows a state in which an insulating paper 40, an insulator 30, and a coil 20 are assembled to the split core 10.
  • Fig. 2 is a perspective view showing the split core 10 of this embodiment, and shows a state in which the insulating paper 40 and the insulator 30 are assembled to the split core 10 and the insulating paper 40 is open.
  • Fig. 3 is an exploded perspective view showing the split core 10 of this embodiment, and shows one of the insulators 30 being omitted.
  • Fig. 4 is a side view showing the split core 10 of this embodiment, and shows a state in which one of the insulators 30 is being assembled to the split core 10.
  • the electric motor (not shown) of this embodiment includes a stator configured by assembling multiple split cores 10 (see FIG. 1) into a ring shape, and a rotor (not shown) arranged opposite the stator.
  • the electric motor of this embodiment is an inner rotor type three-phase synchronous motor, but is not limited to this.
  • the stator includes multiple split cores 10, coils 20, insulators 30, and insulating paper 40.
  • Each of the multiple split cores 10 has a teeth portion 11 and a yoke portion 12.
  • the split cores 10 are formed by stacking multiple electromagnetic steel sheets in a roughly T-shape, but are not limited to this.
  • the teeth portion 11 has a teeth main body portion 11a extending radially inward from the yoke portion 12, and a teeth flange portion 11b disposed at the tip of the teeth main body portion 11a and extending in the circumferential direction.
  • the end faces of the split cores 10 are the end faces of the split cores 10 in the axial direction of the stator of this embodiment, and more specifically, are two roughly T-shaped faces that face each other in the axial direction of the stator of this embodiment.
  • the side faces of the split cores 10 are the sides of the yoke portion 12 and teeth portion 11 that connect the two end faces of the split cores 10 and face the coil 20.
  • the coil 20 is wound using a concentrated winding method around the teeth portion 11 (more specifically, the teeth main body portion 11a) of the split core 10. By winding the coil 20 around the split core 10, it is possible to increase the ratio of the volume of the coil 20 to the space between adjacent teeth portions 11 (space factor) compared to when the coil is wound around a one-piece stator core.
  • the coil 20 is made of enamel-coated copper wire.
  • the insulator 30 is interposed between the end face of the split core 10 and the coil 20.
  • the insulator 30 has a function of electrically insulating the split core 10 and the coil 20.
  • the insulator 30 has an insulator body portion 31 that abuts against the end face of the split core 10, and a retaining portion 32 that extends axially from the insulator body portion 31.
  • each insulator 30 has four retaining portions 32, but the number of retaining portions 32 is not limited to this.
  • the insulator 30 is made of a material that contains an insulating resin material.
  • the insulating paper 40 is interposed between the side of the split core 10 and the coil 20. More specifically, the insulating paper 40 is interposed between the side of the yoke portion 12 facing the coil 20 and the coil 20, between the side of the teeth main body portion 11a facing the coil 20 and the coil 20, and between the teeth flange portion 11b facing the coil 20 and the coil 20.
  • the side of the yoke portion 12 facing the coil 20 is simply referred to as the side of the yoke portion 12
  • the side of the teeth main body portion 11a facing the coil 20 is simply referred to as the side of the teeth main body portion 11a
  • the side of the teeth flange portion 11b facing the coil 20 is simply referred to as the side of the teeth flange portion 11b.
  • the insulating paper 40 has the function of electrically insulating the split core 10 and the coil 20. As shown in FIG. 1, the insulating paper 40 wraps around the coils 20 wound around the teeth 11 from the outside, thereby electrically insulating adjacent coils 20 from each other.
  • the insulating paper 40 has protrusions 41 that protrude from the end faces of the split core 10 in the axial direction of the stator (i.e., a direction parallel to a line connecting, for example, the centers of the two end faces of the split core 10, hereinafter also referred to simply as the axial direction).
  • the protrusions 41 include a first protrusion 41A that protrudes from the end face of the teeth flange 11b and a second protrusion 41B that protrudes from the end face of the yoke portion 12.
  • the axial direction corresponds to the up-down direction
  • the first protrusion 41A and the second protrusion 41B protrude upward and downward from the end faces of the split core 10.
  • the end faces of the yoke portion 12 are the end faces of the yoke portion 12 of the end faces of the split core 10, and the end faces of the teeth flange 11b are the end faces of the teeth flange 11b of the end faces of the split core 10.
  • the insulator 30 has an insulator body 31 and a retaining portion 32.
  • the retaining portion 32 holds the insulating paper 40 between itself and the side of the split core 10.
  • the retaining portion 32 includes a first retaining portion 32A that holds the insulating paper 40 between itself and the side of the tooth flange portion 11b, and a second retaining portion 32B that holds the insulating paper 40 between itself and the side of the yoke portion 12.
  • the first retaining portion 32A has a shape that follows the side of the tooth flange portion 11b
  • the second retaining portion 32B has a shape that follows the side of the yoke portion 12.
  • the retaining portion 32 of the insulator 30 is longer in the axial direction than the protruding portion 41 of the insulating paper 40 (in FIG. 4, the axial length L1 of the retaining portion 32>axial length L2 of the protruding portion 41).
  • the middle stage is the stage where the retaining portion 32 of the insulator 30 reaches a position where it holds the insulating paper 40 between the side of the split core 10 (or the stage where the tip of the retaining portion 32 passes the end face of the split core 10 in the axial direction). Thereafter, when the insulator 30 is brought even closer to the split core 10, the holding portion 32 functions as a guide, so interference between the insulator body 31 and the protruding portion 41 of the insulating paper 40 can be suppressed.
  • a pair of insulators 30 is provided for each split core 10.
  • the length of the retaining portion 32 of each insulator 30 (axial length L1 of the retaining portion 32) is less than half the length of the split core 10. This makes it possible to prevent the retaining portions 32 of a pair of insulators 30 from interfering with each other.
  • At least a portion of the retaining portion 32 in this embodiment extends away from the central region of the side of the teeth portion 11 of the split core 10 (more specifically, the side of the teeth main body portion 11a). In other words, the retaining portion 32 extends along the side of the yoke portion 12 and the side of the teeth flange portion 11b. This makes it possible to avoid excessive stress being generated in the coil 20 when multiple split cores 10 are assembled together.
  • FIG. 5 is a perspective view showing a split core 101 and other components of the present embodiment, in which insulating paper 40 and an insulator 301 are attached to the split core 101 and the insulating paper 40 is open.
  • the stator of this embodiment has a rounded base end of the holding portion 321 of the insulator 301.
  • the radius of curvature of the rounded shape may be 0.5 mm or more and half the radial length of the teeth portion 11 or less.
  • the first and second holding portions 321B of this embodiment extend along the side of the yoke portion 12 and the side of the teeth flange portion 11b, similar to the first and second holding portions 32A and 32B of the first embodiment.
  • the first and second holding portions 321B of this embodiment are different from the first and second holding portions 32A and 32B of the first embodiment in that they have the same width at the tip portion.
  • the rest of the configuration is the same as that of the first embodiment.
  • the insulator 301 of this embodiment may be modified to include the first and second holding portions 32A and 32B of the first embodiment instead of the first and second holding portions 321B of this embodiment.
  • Fig. 6 is a perspective view showing a split core 102 and the like according to the third embodiment, in which the insulating paper 40 and the insulator 302 are attached to the split core 102 and the insulating paper 40 is in an open state.
  • the retaining portion 322 of the insulator 302 extends along the central region of the side of the teeth portion 11 of the split core 102 (more specifically, the side of the teeth main body portion 11a).
  • the retaining portion 322 also narrows toward the axial center of the split core 10. The rest of the configuration is the same as in the first embodiment.
  • FIG. 7 is a perspective view showing a split core 103 and the like of this embodiment, in which insulating paper 40 and an insulator 303 are attached to the split core 103, and the insulating paper 40 is in an open state.
  • the holding portion 323 of the insulator 303 extends along the entire side surface of the teeth portion 11 of the split core 103 and along the side surface of the yoke portion 12.
  • the rest of the configuration is the same as in the first embodiment.
  • the pair of insulators 30 have the same shape, but the pair of insulators 30 may have different shapes. In other words, the pair of insulators 30 may be of different types.
  • the shapes of the multiple retaining portions 32 in each insulator 30 are similar to each other, but the shapes of the multiple retaining portions 32 may be significantly different from each other.
  • the base end of the first retaining portion 32A may not be rounded, while the base end of the second retaining portion 32B may be rounded.
  • FIG. 1 A plurality of split cores; A coil wound around the split core; an insulator interposed between an end face of the split core and the coil; an insulating paper interposed between a side surface of the split core and the coil;
  • a stator comprising: the insulating paper has a protruding portion protruding from an end surface of the split core in the axial direction of the stator, the insulator has a holding portion extending in the axial direction and holding the insulating paper between the holding portion and a side surface of the split core, The retaining portion is longer than the protruding portion in the axial direction.
  • This disclosure can be used for stators and electric motors equipped with the same.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
PCT/JP2024/008418 2023-06-01 2024-03-06 固定子およびそれを備えた電動機 Ceased WO2024247427A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE212024000220.8U DE212024000220U1 (de) 2023-06-01 2024-03-06 Stator und damit ausgestatteter Elektromotor
JP2025523277A JPWO2024247427A1 (https=) 2023-06-01 2024-03-06

Applications Claiming Priority (2)

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JP2023091064 2023-06-01
JP2023-091064 2023-06-01

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WO2024247427A1 true WO2024247427A1 (ja) 2024-12-05

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016017030A1 (ja) * 2014-08-01 2016-02-04 三菱電機株式会社 電動機の固定子
JP2023061075A (ja) * 2021-10-19 2023-05-01 ニデックインスツルメンツ株式会社 モータ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016017030A1 (ja) * 2014-08-01 2016-02-04 三菱電機株式会社 電動機の固定子
JP2023061075A (ja) * 2021-10-19 2023-05-01 ニデックインスツルメンツ株式会社 モータ

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DE212024000220U1 (de) 2025-11-24

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