Classifications

• • 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
  • H02K1/16—Stator cores with slots for windings
• • 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

• the technology disclosed herein relates to a stator.
• stator that includes a stator core with multiple radially extending teeth, a resin insulator attached to the stator core, and a winding portion wound around the multiple teeth via the insulator.
• Some stators of this type have an insulating film provided between the teeth and the winding portion (see, for example, JP 2018-198515 A).
• the technology disclosed herein aims to provide a stator that can ensure insulation for the windings while preventing the stator from becoming too large.
• the stator comprises a stator core having a plurality of teeth extending radially, a resin insulator attached to the stator core, and a winding portion wound around the plurality of teeth via the insulator.
• the stator core has a mounting surface on which the insulator is mounted, and a groove is formed on the mounting surface on the opposite side of the insulator to the winding portion, and a gas layer is formed between the stator core and the insulator by the groove.
• the stator according to the technology disclosed herein can ensure insulation for the windings while preventing the stator from becoming too large.
• FIG. 2 is a plan view of the stator according to the first embodiment.
• FIG. 2 is a plan sectional view of a stator component according to the first embodiment.
• FIG. 11 is a plan sectional view of a stator component according to a second embodiment.
• FIG. 11 is a plan sectional view of a stator component according to a third embodiment.
• FIG. 13 is a plan cross-sectional view of a stator component according to a fourth embodiment.
• FIG. 13 is a plan cross-sectional view of a stator component according to the fifth embodiment.
• the stator 10 includes a plurality of stator components 12.
• the stator 10 is configured by assembling a plurality of stator components 12 in an annular shape.
• FIG. 1 shows the configuration of half of the stator 10.
• the stator 10 is applied to a brushless motor.
• the brushless motor may be used for any purpose. Examples of brushless motors include fan motors, pump drive motors, and compressor motors.
• the X direction indicates the tangential direction of the stator 10
• the Y direction indicates the radial direction of the stator 10
• the Z direction indicates the axial direction of the stator 10.
• the circumferential direction of the stator 10 refers to the direction around the central axis of the stator 10.
• the tangential direction, radial direction, axial direction, and circumferential direction of the stator core 24, which will be described later, are the same directions as the tangential direction, radial direction, axial direction, and circumferential direction of the stator 10, respectively.
• each stator component 12 includes a core member 14, an insulator 16, and a winding winding portion 18.
• the core member 14 has a core back portion 20 and teeth portions 22.
• the core back portion 20 extends in the circumferential direction of the stator core 24, and the teeth portions 22 extend from the center of the core back portion 20 toward the inside in the Y direction.
• the tip portion of the teeth portion 22 is a free end, and the base end portion of the teeth portion 22 is connected to the core back portion 20.
• the stator core 24 (see FIG. 1) is formed by assembling multiple core members 14 in an annular shape.
• the multiple core back portions 20 form an annular portion 26 (see FIG. 1), and the multiple teeth portions 22 extend radially from the center of the stator core 24. Slots 28 are formed between the multiple teeth portions 22.
• each stator component 12 is not strictly symmetrical in the X direction when viewed from the Z direction. However, for the sake of convenience, the following description will assume that the main configuration of each stator component 12 is symmetrical in the X direction when viewed from the Z direction, and only the configuration of one side of each stator component 12 will be described.
• the core back portion 20 has an inner surface 20A, and the teeth portion 22 has a side surface 22A.
• the inner surface 20A extends in the X and Z directions and faces inward in the Y direction.
• the side surface 22A extends in the Y and Z directions and faces in the X direction.
• the inner surface 20A and the side surface 22A are in contact with the slot 28.
• the insulator 16 is attached to the core member 14.
• the insulator 16 is made of resin. Examples of resins that form the insulator 16 include polyimide, polyamide, polyphenylene sulfide (PPS), and polybutylene terephthalate (PBT). Any resin may be used to form the insulator 16.
• the insulator 16 has an inner wall portion 30 and a side wall portion 32.
• the inner wall portion 30 is attached to the inner surface 20A and covers the inner surface 20A.
• the side wall portion 32 is attached to the side surface 22A and covers the side surface 22A.
• the inner wall portion 30 and the side wall portion 32 are disposed in the slot 28.
• the inner surface 20A and the side surface 22A are examples of the "mounting surface” according to the technology of the present disclosure.
• the inner surface 20A is an example of the "first mounting surface” according to the technology of the present disclosure
• the side surface 22A is an example of the "second mounting surface” according to the technology of the present disclosure.
• the winding winding portion 18 is wound around the teeth portion 22 via the insulator 16.
• the winding winding portion 18 is formed by winding the winding around the teeth portion 22 in the Y direction.
• the winding that forms the winding winding portion 18 may have only one winding winding portion 18, or may have several winding winding portions 18.
• the winding portion 18 has an axial portion 34 extending in the Z direction.
• the axial portion 34 is inserted into the slot 28.
• the axial portion 34 has a side surface 34A and an end surface 34B.
• the side surface 34A is a surface formed on the tooth portion 22 side of the axial portion 34 (i.e., the inner side surface), and the end surface 34B is a surface formed on the core back portion 20 side of the axial portion 34.
• a side wall portion 32 is interposed between the side surface 34A of the axial portion 34 and the side surface 22A of the tooth portion 22, and an inner wall portion 30 is interposed between the end surface 34B of the axial portion 34 and the inner surface 20A of the core back portion 20.
• a first groove 36 is formed on the inner surface 20A, and a second groove 38 is formed on the side surface 22A.
• the first groove 36 is located on the opposite side of the winding winding portion 18 across the inner wall portion 30 in the Y direction, and the second groove 38 is located on the opposite side of the winding winding portion 18 across the side wall portion 32 in the X direction.
• the position of the first groove 36 in the X direction and the width of the first groove 36 in the X direction are set so that the range of the width of the winding winding portion 18 in the X direction falls within the range of the width of the first groove 36 in the X direction.
• the position of the second groove 38 in the Y direction and the width of the second groove 38 in the Y direction are set so that the range of the width of the winding winding portion 18 in the Y direction falls within the range of the width of the second groove 38 in the Y direction.
• a first gas layer 40 is formed between the core back portion 20 and the inner wall portion 30 by the first groove 36, and a second gas layer 42 is formed between the teeth portion 22 and the side wall portion 32 by the second groove 38.
• the first groove 36 and the second groove 38 are formed to penetrate in the Z direction.
• the first groove 36 and the second groove 38 are an example of a "groove” according to the technology disclosed herein.
• the first gas layer 40 and the second gas layer 42 are an example of a "gas layer” according to the technology disclosed herein.
• a first gas layer 40 is formed between the core back portion 20 and the inner wall portion 30 by the first groove 36
• a second gas layer 42 is formed between the teeth portion 22 and the side wall portion 32 by the second groove 38. Therefore, an insulating layer is formed between the core back portion 20 and the winding winding portion 18 by adding the first gas layer 40 to the inner wall portion 30, so that insulation for the winding winding portion 18 can be ensured. Also, an insulating layer is formed between the teeth portion 22 and the winding winding portion 18 by adding the second gas layer 42 to the side wall portion 32, so that insulation for the winding winding portion 18 can be ensured.
• the thickness of the inner wall portion 30 can be made thinner than when the core back portion 20 and the winding winding portion 18 are insulated only by the inner wall portion 30.
• the second gas layer 42 between the teeth portion 22 and the side wall portion 32 by the second groove 38 the thickness of the side wall portion 32 can be made thinner than when the teeth portion 22 and the winding winding portion 18 are insulated only by the side wall portion 32. This allows the cross-sectional area of the slot 28 to be enlarged, and therefore the number of turns of the winding winding portion 18 can be increased, thereby preventing the stator 10 from becoming larger. In other words, it is possible to prevent the stator 10 from becoming larger in order to enlarge the cross-sectional area of the slot 28.
• one protrusion 44 is formed on the bottom surface of the second groove 38, but multiple protrusions 44 may be formed. Also, multiple recesses 46 may be formed on the surface of the side wall portion 32 opposite the contact surface with the protrusion 44, corresponding to the multiple protrusions 44.
• the protrusion 44 may be formed on the bottom surface of the first groove 36, protruding toward the inner wall 30, and supporting the inner wall 30.
• the recess 46 may be formed on the surface of the inner wall 30 opposite the contact surface with the protrusion 44, forming a gas layer 48 between the winding winding 18 and the inner wall 30.
• the inner wall portion 30 is supported by the convex portion 44, thereby improving the rigidity of the inner wall portion 30. Furthermore, even if the convex portion 44 is formed on the bottom surface of the first groove 36, the gas layer 48 is formed by the concave portion 46, so insulation can be ensured.
• This configuration allows the groove 50 to be formed continuously from the inner surface 20A to the side surface 22A, making it easy to process the groove 50.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Insulation, Fastening Of Motor, Generator Windings (AREA)
• Iron Core Of Rotating Electric Machines (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=95826220

Family Applications (1)

Country Status (2)

Citations (3)

• 2023
  • 2023-11-24 JP JP2023199407A patent/JP2025085495A/ja active Pending
• 2024
  • 2024-09-04 WO PCT/JP2024/031758 patent/WO2025109831A1/ja active Pending

Patent Citations (3)

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