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CN-122000127-A - Sheath-core composite wire for motor and preparation method and application thereof

CN122000127ACN 122000127 ACN122000127 ACN 122000127ACN-122000127-A

Abstract

The invention discloses a sheath-core composite wire for a motor and a preparation method and application thereof, and belongs to the technical field of wires. According to the invention, the carbon material is used as the core layer, and has weaker skin effect and lower resistivity, and in a high-frequency environment, the uniform distribution of current on the cross section of the core layer can be effectively ensured, so that the area of an intermediate invalid current area generated by high frequency of the electromagnetic wire is reduced, and the charge density on the unit cross section is increased. Therefore, the invention can solve the problem that the effective current carrying area of the existing metal wire is reduced in a high-frequency state.

Inventors

  • Zhang Gongwu
  • SHENG FEI
  • ZHU SONG

Assignees

  • 苏州汇川联合动力系统股份有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (14)

  1. 1. The utility model provides a sheath core composite wire for motor, its characterized in that, the motor includes stator core, stator core has along circumference evenly distributed's stator groove, sheath core composite wire arranges in the stator inslot, wherein, sheath core composite wire includes cortex and sandwich layer, the cortex is the metal hollow tube, the sandwich layer is the carbon material.
  2. 2. The sheath-core composite wire for an electric machine according to claim 1, wherein the carbon material comprises at least one of carbon nanotubes, graphene oxide, and carbon fibers.
  3. 3. The sheath-core composite wire for an electric machine according to claim 1, wherein the material of the metal hollow tube comprises at least one of gold and its alloy, silver and its alloy, copper and its alloy, iron and its alloy, aluminum and its alloy.
  4. 4. A sheath-core composite wire for an electric motor according to claim 1 to 3, wherein the sheath-core composite wire has a larger area ratio in cross section than the core-layer, and/or wherein the sheath-core composite wire has a larger area ratio in cross section than the core-layer, The mass ratio of the sheath layer in the sheath-core composite wire is larger than that of the core layer in the sheath-core composite wire.
  5. 5. A sheath-core composite wire for an electric motor according to claim 4, wherein the sheath-core composite wire has an area ratio of (65-85): (15-45) in a cross section of the sheath-core composite wire, and/or, The mass ratio of the sheath layer to the core layer in the sheath-core composite wire is (72-84) to (18-26).
  6. 6. A sheath-core composite wire for an electric motor according to any one of claims 1 to 3, wherein the core layers are symmetrically distributed along the center line of the sheath-core composite wire at the cross section of the sheath-core composite wire.
  7. 7. A sheath-core composite wire for an electric motor as set forth in any one of claims 1 to 3, wherein the carbon material of the core layer is selected from one of a concentric lay structure, a concentric composite lay structure, a transposition composite lay structure, a parallel molded structure, a single wound molded structure, and a braided molded structure.
  8. 8. A sheath-core composite wire for an electric motor according to claim 1 to 3, wherein the outer peripheral shape of said metal hollow tube is one selected from rectangular, circular, elliptical, trapezoidal, and/or, The inner peripheral shape of the metal hollow tube is one selected from rectangle, circle, ellipse and trapezoid.
  9. 9. The preparation method of the sheath-core composite wire for the motor is characterized by comprising the following steps of: Bundling carbon material wires into metal hollow tube to form sheath-core composite wire for motor, or Presetting carbon material wire on metal belt, and producing skin-core composite wire for motor by cladding welding process, or Presetting a carbon material wire in a crystallizer, and producing the sheath-core composite wire for the motor by adopting a continuous pipe casting process.
  10. 10. The method of manufacturing a sheath-core composite wire for an electric motor according to claim 9, wherein bundling carbon material wires into a metal hollow tube to form the sheath-core composite wire for an electric motor comprises: One end of a carbon material wire is arranged on a magnetic traction head, and the carbon material wire is drawn by a traction machine to penetrate into a metal hollow tube so as to form a sheath-core composite wire for the motor.
  11. 11. The method for manufacturing a sheath-core composite wire for an electric motor according to claim 9, wherein the step of pre-placing the carbon material wire on the metal tape and producing the sheath-core composite wire for an electric motor by a cladding welding process comprises: the metal belt is processed into a tube gradually and coated on the periphery of the carbon material wire, the longitudinal seam of the tube is welded to form a wire blank, and then the sheath-core composite wire for the motor can be obtained through drawing and heat treatment.
  12. 12. The method for manufacturing a sheath-core composite wire for an electric motor according to claim 9, wherein the step of presetting the carbon material wire in the crystallizer and producing the sheath-core composite wire for an electric motor by using a continuous casting tube process comprises: Presetting a carbon material wire in a crystallization die of a crystallizer, pouring molten metal, and continuously pulling out the molten metal from the other end of the crystallizer after the molten metal is solidified, so as to obtain the sheath-core composite wire for the motor.
  13. 13. Use of a sheath-core composite wire for an electric motor according to any one of claims 1 to 8 or a sheath-core composite wire for an electric motor produced by the production method according to any one of claims 9 to 12 in an electric motor.
  14. 14. Use according to claim 13, wherein the motor is wound with sheath-core composite wires to reduce the skin effect of the motor windings in a high frequency environment.

Description

Sheath-core composite wire for motor and preparation method and application thereof Technical Field The invention relates to the technical field of wires, in particular to a sheath-core composite wire for a motor and a preparation method and application thereof. Background With further improvement of the power demand of the new energy automobile market on the motor, the development trend of the motor also tends to be higher and higher, however, the higher speed of the motor makes the metal wire of the motor easy to generate skin effect, the skin effect can reduce the effective current carrying area of the conductor, the equivalent resistance of the wire winding is increased, and the generated copper loss is increased, so that the performance of the motor is seriously affected. The conventional solution is to reduce the diameter of the wire, such as by using a plurality of parallel fine stranded wires to reduce the skin effect of the metal wire, thereby reducing the ac copper loss. However, the method has the optimal frequency range (1 kHz-3 kHz), and beyond the range, the proximity effect of the wire takes the dominant role of high-frequency loss instead of the skin effect, so that the method has the problem of low effective current carrying area of the metal wire in a high-frequency state. Disclosure of Invention The invention mainly aims to provide a sheath-core composite wire for a motor, a preparation method and application thereof, and aims to solve the problem that the effective current carrying area of the existing metal wire is reduced in a high-frequency state. In order to achieve the above object, according to a first aspect of the present invention, there is provided a sheath-core composite wire for an electric motor, the electric motor including a stator core having stator slots uniformly distributed in a circumferential direction, the sheath-core composite wire being arranged in the stator slots, wherein the sheath-core composite wire includes a sheath layer and a core layer, the sheath layer being a metal hollow tube, the core layer being a carbon material. In an embodiment, the carbon material comprises at least one of carbon nanotubes, graphene oxide, carbon fibers. In one embodiment, the material of the metal hollow tube comprises at least one of gold and its alloys, silver and its alloys, copper and its alloys, iron and its alloys, aluminum and its alloys. In one embodiment, the skin layer has a larger area than the core layer in the skin-core composite wire cross-section, and/or, The mass ratio of the sheath layer in the sheath-core composite wire is larger than that of the core layer in the sheath-core composite wire. In one embodiment, the ratio of the areas of the sheath and core cross-sections of the sheath-core composite wire is (65-85): (15-45), and/or, The mass ratio of the sheath layer to the core layer in the sheath-core composite wire is (72-84) to (18-26). In one embodiment, the core layer is symmetrically distributed along the center line of the sheath-core composite wire at the cross section of the sheath-core composite wire. In one embodiment, the carbon material of the core layer is selected from one of a concentric lay structure, a concentric composite lay structure, a transposed composite lay structure, a parallel molded structure, a single wound molded structure, and a braided molded structure. In one embodiment, the outer peripheral shape of the metal hollow tube is selected from one of rectangular, circular, elliptical, trapezoidal, and/or, The inner peripheral shape of the metal hollow tube is selected from one of rectangle, circle, ellipse and trapezoid. In a second aspect, the invention provides a method for preparing a sheath-core composite wire for an electric motor, comprising the following steps: Bundling carbon material wires into metal hollow tube to form sheath-core composite wire for motor, or Presetting carbon material wire on metal belt, and producing skin-core composite wire for motor by cladding welding process, or Presetting a carbon material wire in a crystallizer, and producing the sheath-core composite wire for the motor by adopting a continuous pipe casting process. In one embodiment, the method for forming a sheath-core composite wire for an electric motor by bundling carbon material wires into a metal hollow tube includes: One end of a carbon material wire is arranged on a magnetic traction head, and the carbon material wire is drawn by a traction machine to penetrate into a metal hollow tube so as to form a sheath-core composite wire for the motor. In one embodiment, the method for producing the sheath-core composite wire for the motor by presetting the carbon material wire on the metal belt and adopting the cladding welding process comprises the following steps: the metal belt is processed into a tube gradually and coated on the periphery of the carbon material wire, the longitudinal seam of the tube is welded to form a wire blank, and then the