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CN-122001153-A - Motor

CN122001153ACN 122001153 ACN122001153 ACN 122001153ACN-122001153-A

Abstract

The invention discloses a motor which comprises a shell, a rotating shaft, a rotor, a first stator, a first outer ring liquid spraying part, a first inner ring liquid spraying part and a first inner ring liquid spraying part, wherein the rotor is connected with the rotating shaft and can rotate along the circumferential direction along with the rotating shaft, the first stator and the rotor are arranged at intervals along the axial direction, the first stator and the rotor jointly define a first air gap, the first outer ring liquid spraying part is arranged on one side of the shell far away from the rotating shaft along the radial direction and is used for spraying cooling liquid towards the first stator, the first inner ring liquid spraying part is arranged on one side of the shell close to the rotating shaft along the radial direction and is used for spraying cooling liquid towards the rotor and the first stator, the first air gap is not closed, and the first air gap is used for enabling the cooling liquid sprayed by the first inner ring liquid spraying part to flow to the side wall of the shell along the radial direction. The invention can cool the stator and the rotor at the same time without increasing the oil stirring loss of the rotor and the manufacturing cost of the motor, and effectively improves the cooling efficiency of the stator and the rotor of the motor.

Inventors

  • KANG YAJIE
  • CHENG SHAOHUA
  • HUANG ZHIQUAN

Assignees

  • 上海磁雷革传动系统有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (16)

  1. 1. An electric machine, comprising: A housing; A rotating shaft; The rotor is connected with the rotating shaft and can rotate along the circumferential direction along with the rotating shaft; a first stator axially spaced from the rotor, the first stator and the rotor collectively defining a first air gap; the first outer ring liquid spraying part is arranged on one side of the shell, far away from the rotating shaft, in the radial direction and is used for spraying cooling liquid towards the first stator; The first inner ring liquid spraying part is arranged on one side of the shell, which is close to the rotating shaft, and is used for spraying cooling liquid towards the rotor and the first stator, the first air gap is not closed, and along the radial direction, the first air gap is used for enabling the cooling liquid sprayed out of the first inner ring liquid spraying part to flow to the side wall of the shell.
  2. 2. The motor of claim 1 wherein said rotor includes a first side, said first stator includes a second side, said first side being spaced apart from said second side along said axial direction, and said first side being parallel to said second side, said first side and said second side together forming said first air gap.
  3. 3. The motor of claim 2, wherein the first inner ring spray portion includes a first spray ring and at least one first spray opening, the first spray ring is disposed on the housing, in the radial direction, the first spray ring is closer to the rotating shaft than the first outer ring spray portion, the first spray opening is disposed on an inner wall of the first spray ring, in the radial direction, the first stator includes a first inner ring and a first outer ring, the first inner ring is closer to the rotating shaft than the first outer ring, and the first spray opening sprays the cooling liquid toward the first inner ring.
  4. 4. The motor of claim 3, wherein the first inner ring spray portion includes at least one first nozzle disposed on the first spray ring, the first nozzle spraying the cooling fluid toward the first side.
  5. 5. The motor of claim 4 wherein said first nozzle extends toward said rotor in a first direction, said first direction intersecting said first side to form a first spray angle.
  6. 6. The motor of claim 5 wherein the first spray angle comprises any one of an acute angle or an obtuse angle.
  7. 7. The motor of claim 6 wherein said first spray angle comprises any one of 5 °, 15 °, 30 °, 45 °, 60 °, 85 °, 120 °, 135 °, 150 °.
  8. 8. The motor of claim 3, wherein the first outer ring spray portion includes a second spray ring and a first outer ring spray opening, the second spray ring being disposed on a side of the housing remote from the shaft in the radial direction, the first outer ring spray opening being disposed on an inner wall of the second spray ring, the first outer ring spray opening being directed toward the first outer ring spray cooling fluid.
  9. 9. The motor of claim 8, wherein the second spray ring includes a first portion and a second portion, the first portion and the second portion being in communication, the projections of the first portion and the second portion in the radial direction intersecting, the first outer ring spray ports including a plurality of second spray ports and a plurality of third spray ports, the plurality of second spray ports being disposed in the first portion at intervals along the circumferential direction, the plurality of third spray ports being disposed in the second portion at intervals along the circumferential direction.
  10. 10. An electric machine as claimed in any one of claims 2 to 9, comprising: the second stator is arranged at two sides of the rotor at intervals with the first stator along the axial direction, and the second stator and the rotor jointly define a second air gap; The second outer ring liquid spraying part is arranged at two sides of the rotor along the axial direction at intervals, is arranged at one side of the shell far away from the rotating shaft along the radial direction, and is used for spraying cooling liquid towards the second stator; The second inner ring liquid spraying part is arranged at two sides of the rotor along the axial direction at intervals, the second inner ring liquid spraying part is arranged at one side of the shell close to the rotating shaft, the second inner ring liquid spraying part is used for spraying cooling liquid towards the rotor and the second stator, the second air gap is not closed, and along the radial direction, the second air gap is used for enabling the cooling liquid sprayed by the second inner ring liquid spraying part to flow towards the side wall of the shell.
  11. 11. The motor of claim 10 wherein said rotor includes a third side, said first side and said third side being disposed opposite sides of said rotor in said axial direction, said second stator including a fourth side, said third side being spaced from said fourth side in said axial direction and said third side being parallel to said fourth side, said third side and said fourth side together forming said second air gap.
  12. 12. The motor of claim 11, wherein the second inner ring spray portion includes a third spray ring and at least one fourth spray opening, the third spray ring is disposed on the housing, the third spray ring is closer to the rotating shaft than the second outer ring spray portion in the radial direction, the fourth spray opening is disposed on an inner wall of the third spray ring, the second stator includes a second inner ring and a second outer ring in the radial direction, the second inner ring is closer to the rotating shaft than the second outer ring, and the fourth spray opening sprays the cooling liquid toward the second inner ring.
  13. 13. The motor of claim 12, wherein the second inner ring spray portion includes at least one second nozzle disposed on the third spray ring, the second nozzle spraying the cooling fluid toward the second side.
  14. 14. The motor of claim 13 wherein the second nozzle extends toward the rotor in a first direction, the first direction intersecting the second side to form a second spray angle, the second spray angle excluding 90 °.
  15. 15. The motor of any one of claims 10-14, wherein the second outer ring spray portion includes a fourth spray ring and a second spray portion, the fourth spray ring being disposed on a side of the housing away from the rotating shaft in the radial direction, the second spray portion being disposed on an inner wall of the fourth spray ring, the second spray portion spraying the coolant toward the other side of the second stator, the other side of the second stator being disposed away from the rotating shaft in the radial direction.
  16. 16. The motor of claim 15, wherein the fourth spray ring includes a third portion and a fourth portion, the third portion and the fourth portion being in communication, projections of the third portion and the fourth portion in the radial direction intersecting, the second spray portion including a plurality of fifth spray openings and a plurality of sixth spray openings, the plurality of fourth spray openings being disposed in the third portion at intervals along the circumferential direction, the plurality of fifth spray openings being disposed in the fourth portion at intervals along the circumferential direction.

Description

Motor Technical Field The invention relates to the technical field of motors, in particular to a motor. Background A permanent magnet synchronous motor (PERMANENT MAGNET Synchronous Motor, PMSM) is a synchronous motor that uses permanent magnets to generate a magnetic field. The permanent magnet synchronous motors are in turn divided into Axial permanent magnet synchronous motors (Axial Flux PERMANENT MAGNET Synchronous Motor, AFPM) and Radial permanent magnet synchronous motors (Radial Flux PERMANENT MAGNET Synchronous Motor, rfPM). In order to prevent excessive heat generated by electromagnetic loss and mechanical loss in the running process of the motor, the temperature of the motor is increased, so that the performance of the motor is possibly reduced, insulation is aged or even damaged, and the cooling of a stator winding and the cooling of a rotor belong to core problems in the development process of a permanent magnet synchronous motor. The rotor of the permanent magnet synchronous motor is cooled generally in two modes, namely, the rotor is cooled by air cooling, namely, a traditional motor cooling mode, and cooling liquid (such as cooling oil) is led into the rotor, and then the cooling liquid is thrown out at two ends of the rotor by rotating the rotor so as to indirectly cool the rotor. However, since the rotor is a high rotational speed moving part, it is necessary to avoid the entry of cooling liquid into the air gap of the rotor, which is usually defined by the rotor rotating moving surface and stator stationary surface which are spaced apart. Specifically, for example, in a radial permanent magnet synchronous motor, because the air gap of the rotor is a concentric cylindrical surface, the cooling liquid entering the air gap is difficult to throw out under the action of the centrifugal force of the rotor, and the cooling liquid convectively flows between the rotating surface of the rotor and the stationary concentric cylindrical surface of the stator, on the one hand, great stirring oil loss is caused, and the stirring oil loss refers to energy consumption caused by the flowing of the cooling liquid in the interior of the motor, and is generally represented by the increase of viscosity and the increase of temperature of the cooling liquid. On the other hand, the coolant in the air gap is difficult to circulate and is disadvantageous for heat dissipation, and therefore the coolant is generally not allowed to enter the air gap. At present, an axial permanent magnet synchronous motor on the market generally adopts a mode of sealing an air gap of a rotor of the motor to isolate the rotor, the air gap of the motor is formed by a rotary motion surface of the rotor and a static surface of a stator at intervals in the axial direction, in the prior art, a baffle plate and the like are generally required to be arranged between the rotary motion surface of the rotor and the static surface of the stator, and the baffle plate is simultaneously in sealing connection with the rotary motion surface and the static surface in the axial direction, so that the air gap is sealed, cooling liquid cannot be led into the air gap, direct contact between the cooling liquid and the rotor is avoided, and thus excessive oil stirring loss is avoided, an oil cooling channel is designed only aiming at the stator, the sealing cost is higher, the process is complex, and the mass production difficulty is high. For the rotor of axial motor, adopt the scheme that oil and epaxial trompil are thrown out the coolant liquid in the axle generally to cool off, the nozzle opening of this scheme follows the axle and rotates together, generally need open more than 4 nozzle openings in the circumferencial direction at least, on the one hand, the processing and the sealed processing requirement of axle is high to oil in the axle, can increase extra processing cost. On the other hand, the axial permanent magnet synchronous motor in the prior art cools the rotor in an indirect cooling mode, so that the cooling efficiency is low, and the magnetic steel demagnetizing risk and the use cost of the rotor are high. Disclosure of Invention The invention aims to solve the technical problems of low cooling efficiency and high production cost of a permanent magnet synchronous motor. The invention provides a motor, which can cool a stator and a rotor at the same time under the condition of not increasing the oil stirring loss of the rotor and the manufacturing cost of the motor, and effectively improves the cooling efficiency of the stator and the rotor of the motor. In order to solve the above technical problems, an embodiment of the present invention discloses a motor, including: A housing; A rotating shaft; The rotor is connected with the rotating shaft and can rotate along the circumferential direction along with the rotating shaft; A first stator disposed in spaced relation to the rotor along the axial direction, the first stator and the rotor toget