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CN-122003799-A - Motor rotor cooling structure and motor

CN122003799ACN 122003799 ACN122003799 ACN 122003799ACN-122003799-A

Abstract

The application provides a motor rotor cooling structure which comprises a rotor core, wherein the rotor core is provided with a magnetic steel groove, magnetic steel is arranged in the magnetic steel groove, a gap is reserved between the magnetic steel and the wall of the magnetic steel groove, the gap forms a cooling flow channel, the cooling flow channel comprises a first cooling flow channel and a second cooling flow channel, a first end plate is arranged on the end face of the first end plate, facing the rotor core, and is communicated with the first cooling flow channel, a first oil outlet is arranged on the second end plate, and is communicated with the first cooling flow channel, a second oil outlet is arranged on the end face of the second end plate, facing the rotor core, and is communicated with the second cooling flow channel, and the first end plate is provided with a second oil outlet, communicated with the second cooling flow channel, and in the first cooling flow channel and the second cooling flow channel, the cooling oil can flow in opposite directions. The application also relates to a hub motor.

Inventors

  • Yue Xiaotian
  • ZHANG CHENLONG
  • JIA XUEFANG

Assignees

  • 舍弗勒技术股份两合公司

Dates

Publication Date
20260508
Application Date
20231023

Claims (10)

  1. A motor rotor cooling structure, comprising: a rotor core (2), wherein the rotor core (2) is provided with a magnetic steel groove (21); The magnetic steel (3), the magnetic steel (3) is installed in the magnetic steel groove (21), a gap is reserved between the magnetic steel (3) and the wall of the magnetic steel groove (21), the gap forms a cooling flow channel, the cooling flow channel penetrates through the rotor core (2) along the axial direction (A) of the rotor core (2), cooling oil passing through the cooling flow channel can directly contact the magnetic steel (3), the cooling flow channel comprises a first cooling flow channel (211) and a second cooling flow channel (212), and the first cooling flow channel (211) is positioned on the radial outer side of the second cooling flow channel (212); The first end plate (4), first end plate (4) set up in the axial one end of rotor core (2), first end plate (4) with rotor core (2) laminating, the orientation of first end plate (4) rotor core (2) terminal surface is provided with first oil groove (41), first oil groove (41) with first cooling runner (211) intercommunication, and The second end plate (5), the second end plate (5) is arranged at the other axial end of the rotor core (2), the second end plate (5) is attached to the rotor core (2), the second end plate (5) is provided with a first oil outlet (52), the first oil outlet (52) is communicated with the first cooling flow channel (211), The end face of the second end plate (5) facing the rotor core (2) is provided with a second oil guiding groove (51), the second oil guiding groove (51) is communicated with the second cooling flow passage (212), the first end plate (4) is provided with a second oil outlet (42), the second oil outlet (42) is communicated with the second cooling flow passage (212), In the first cooling flow channel (211) and the second cooling flow channel (212), cooling oil can flow in opposite directions.
  2. The motor rotor cooling structure according to claim 1, further comprising a rotor hub (1) or a rotor shaft, wherein the rotor core (2), the first end plate (4) and the second end plate (5) are sleeved on the rotor hub (1) or the rotor shaft, The rotor hub (1) or the rotor shaft is provided with a first oil inlet hole (11) and a second oil inlet hole (12), the first oil inlet hole (11) and the second oil inlet hole (12) penetrate through the peripheral wall of the rotor hub (1) or the rotor shaft, the first oil inlet hole (11) and the second oil inlet hole (12) are spaced in the axial direction (A) of the rotor hub (1) or the rotor shaft, The first oil inlet hole (11) is communicated with the first oil guide groove (41), and the second oil inlet hole (12) is communicated with the second oil guide groove (51).
  3. The motor rotor cooling structure according to claim 1, characterized in that the magnetic steel groove (21) is V-shaped, two or two groups of the magnetic steels (3) are installed in the V-shaped magnetic steel groove (21), the tip of the V-shape points to the radial inner side of the rotor core (2), the bifurcation end of the V-shape points to the radial outer side of the rotor core (2), the first cooling flow passage (211) is located at the bifurcation end of the V-shape, and the second cooling flow passage (212) is located at the tip of the V-shape.
  4. The motor rotor cooling structure according to claim 1, characterized in that the first oil guiding groove (41) includes a straight line section (411) and two branch sections (412), one end of the straight line section (411) extends to an inner periphery of the first end plate (4), the other end of the straight line section (411) is connected to the branch sections (412), and the two branch sections (412) each communicate with one of the first cooling flow passages (211).
  5. A motor rotor cooling structure according to claim 3, characterized in that the two bifurcated segments (412) communicate with two adjacent bifurcated ends of two adjacent V-shaped magnetic steel grooves (21), respectively.
  6. The motor rotor cooling structure according to claim 1, wherein the first oil guide groove (41) is not in communication with the second cooling flow passage (212), and the second oil guide groove (51) is not in communication with the first cooling flow passage (211).
  7. The motor rotor cooling structure according to claim 1, wherein a plurality of the first oil guiding grooves (41) are provided, the plurality of the first oil guiding grooves (41) are independent from each other and do not communicate with each other, The second oil guiding grooves (51) are arranged in a plurality, and the second oil guiding grooves (51) are independent and are not communicated with each other.
  8. The motor rotor cooling structure according to claim 1, further comprising an elastic body (6), wherein the elastic body (6) is disposed between a radially inner side wall of the magnetic steel groove (21) and the magnetic steel (3), so that a gap is formed between the magnetic steel (3) and the radially inner side wall of the magnetic steel groove (21), and the elastic body (6) is formed by bending and/or curling a sheet material so that the gap can pass cooling oil.
  9. The motor rotor cooling structure according to claim 8, characterized in that the magnetic steel groove (21) is provided with a limit protrusion (213), the limit protrusion (213) and the elastic body (6) are located at two ends of the magnetic steel (3), the elastic body (6) makes the magnetic steel (3) abut against the limit protrusion (213), and the limit protrusion (213) leaves a gap between the magnetic steel (3) and a radial outer side wall of the magnetic steel groove (21).
  10. An electric machine comprising the electric machine rotor cooling structure of any one of claims 1 to 9.

Description

Motor rotor cooling structure and motor Technical Field The application relates to the technical field of motor cooling and heat dissipation, in particular to a motor rotor cooling structure and a motor. Background For a rotor of an electric machine (such as a permanent magnet synchronous motor), a main heating position of the rotor is near magnetic steel of a rotor core, and the motor heating not only affects the performance of the electric machine, but also causes irreversible demagnetization of the magnetic steel when serious. It is therefore necessary to cool the rotor of the electric machine, in particular in the vicinity of the magnetic steel of the rotor. In one possible solution, the rotor hub is provided with a through hole, and under the action of centrifugal force, the cooling oil in the rotor hub can pass through the through hole, so that the cooling oil flows through the end face of the rotor core, but the cooling oil cannot fully contact the magnetic steel, and the cooling effect is poor. In another possible solution, the magnetic steel in the magnetic steel groove is fixed by glue filling and sealing, and the rotor core is provided with an axial channel for cooling oil to pass through, but the cooling oil cannot directly contact the magnetic steel, so that the cooling effect is poor. For example, CN115085432a discloses a new energy motor rotor oil cooling system, which uses glue to fix the magnetic steel in the magnetic steel groove, and the cooling oil cannot directly contact the magnetic steel, resulting in poor cooling effect. Disclosure of Invention The application aims to overcome or at least alleviate the defects in the prior art and provide a motor rotor cooling structure and a motor with good cooling effect. An embodiment of the present application provides a motor rotor cooling structure including: The rotor core is provided with a magnetic steel groove; The magnetic steel is arranged in the magnetic steel groove, a gap is reserved between the magnetic steel and the wall of the magnetic steel groove, the gap forms a cooling flow passage, the cooling flow passage penetrates through the rotor core along the axial direction of the rotor core, cooling oil passing through the cooling flow passage can directly contact the magnetic steel, the cooling flow passage comprises a first cooling flow passage and a second cooling flow passage, and the first cooling flow passage is positioned at the radial outer side of the second cooling flow passage; The first end plate is arranged at one axial end of the rotor core, the first end plate is attached to the rotor core, a first oil guiding groove is formed in the end face, facing the rotor core, of the first end plate, the first oil guiding groove is communicated with the first cooling flow channel, and The second end plate is arranged at the other axial end of the rotor core, the second end plate is attached to the rotor core, the second end plate is provided with a first oil outlet, the first oil outlet is communicated with the first cooling flow channel, The end face of the second end plate, which faces the rotor core, is provided with a second oil guiding groove which is communicated with the second cooling flow passage, the first end plate is provided with a second oil outlet which is communicated with the second cooling flow passage, In the first cooling flow passage and the second cooling flow passage, cooling oil can flow in opposite directions. In at least one possible embodiment, the motor rotor cooling structure further comprises a rotor hub or rotor shaft, the rotor core, the first end plate and the second end plate are sleeved on the rotor hub or rotor shaft, The rotor hub or the rotor shaft is provided with a first oil inlet hole and a second oil inlet hole, the first oil inlet hole and the second oil inlet hole penetrate through the peripheral wall of the rotor hub or the rotor shaft, the first oil inlet hole and the second oil inlet hole are spaced in the axial direction of the rotor hub or the rotor shaft, The first oil inlet hole is communicated with the first oil guide groove, and the second oil inlet hole is communicated with the second oil guide groove. In at least one possible implementation manner, the magnetic steel groove is V-shaped, two or two groups of magnetic steels are installed in the V-shaped magnetic steel groove, the tip of the V-shaped is directed to the radial inner side of the rotor core, the bifurcation end of the V-shaped is directed to the radial outer side of the rotor core, the first cooling flow passage is located at the bifurcation end of the V-shaped, and the second cooling flow passage is located at the tip of the V-shaped. In at least one possible embodiment, the first oil guiding groove includes a straight line section and two branch sections, one end of the straight line section extends to the inner periphery of the first end plate, the other end of the straight line section is connected to the branch