An oil-cooled motor

Abstract

The present invention provides an oil-cooled motor, wherein the stator includes a first stator punching and a second stator punching, the second stator punching being provided at both ends of the first stator punching; a plurality of first stator punchings are stacked to form a connecting groove and an oil inlet channel on the first stator punching; a plurality of second stator punchings are stacked to form a first axial cooling channel and a second axial cooling channel inside the stator, one end of the first cooling channel being connected to the winding and the other end being connected to the connecting groove; one end of the second cooling channel being connected to the oil ring and the other end being connected to the oil inlet channel; an oil inlet corresponding to the first notch is provided on the housing. Cooling oil enters the oil inlet channel from the oil inlet, a portion of which enters the first cooling channel through the connecting groove, flows through the first cooling channel, and then enters the windings at both ends of the stator, while the remaining portion flows through the second cooling channel and enters the oil ring, thereby cooling the interior of the stator and the stator windings at both ends of the stator.

Description

Technical Field

[0001] The present invention relates to the technical field of oil-cooled motors, and in particular to an oil-cooled motor. Background Art

[0002] Motors generate losses during operation, which are mainly divided into mechanical losses and electrical losses. Electrical losses are further divided into stator losses and rotor losses. Stator losses include stator core losses and winding losses, and the main cause of these losses is motor overheating.

[0003] When the bridge motor operates continuously at high torque, iron loss increases, as it is proportional to the square of the magnetic flux density, leading to core overheating. This increased magnetic flux, in turn, increases the magnetic current component, increasing copper loss in the stator winding and causing the winding to overheat. If the heating components exceed the allowable temperature, the motor may fail or even burn out. Summary of the Invention

[0004] In order to overcome the above technical defects, the object of the present invention is to provide an oil-cooled motor that can cool the interior of the stator and the windings at both ends of the stator.

[0005] The present invention discloses an oil-cooled motor, comprising a stator, wherein the stator comprises a first stator punching sheet and a second stator punching sheet, wherein the second stator punching sheet is provided at both ends of the first stator punching sheet;

[0006] The first stator punching is provided with radial communication holes, and a plurality of the communication holes are arranged along the circumferential direction of the first stator punching; a plurality of the first stator punchings are stacked to form an axial communication groove inside the stator; a first notch is provided on the outer ring of the first stator punching, and the first notch is connected to the communication holes; a plurality of the first stator punchings are stacked to form an oil inlet channel inside the stator, and the oil inlet channel is connected to the communication groove;

[0007] The second stator punching is provided with a plurality of annularly arranged first holes, the first holes corresponding axially to the positions of the windings at both ends of the stator and the communicating grooves; the plurality of second stator punchings are stacked to form an axial first cooling channel inside the stator, one end of the first cooling channel is connected to the windings, and the other end is connected to the communicating grooves; the second stator punching is further provided with a second hole, the second hole is arranged on the outer ring of the stator relative to the first hole, the second hole corresponding axially to the positions of the oil rings at both ends of the stator and the oil inlet channel; the plurality of second stator punchings are stacked to form an axial second cooling channel inside the stator, one end of the second cooling channel is connected to the oil ring, and the other end is connected to the oil inlet channel;

[0008] The oil ring is provided with a second notch, the second notch being communicated with the second cooling channel; and further comprising a housing, the housing being sleeved on the outside of the stator, the housing being provided with an oil inlet, the oil inlet corresponding to the first notch;

[0009] Cooling oil enters the oil inlet channel from the oil inlet. A portion of the cooling oil in the oil inlet channel enters the first cooling channel through the connecting groove, flows through the first cooling channel, and enters the windings at both ends of the stator. The other portion flows through the second cooling channel and enters the second notch on the oil ring, thereby cooling the inside of the stator and the stator windings at both ends of the stator.

[0010] Preferably, the number of the second notches is one or more; when there are more than one, the second notches are symmetrically distributed along the annular direction.

[0011] Preferably, the number of the second holes is one or more; when there are more than one, several of the second holes form a hole group, and the number of the hole group is consistent with the number of the second notches.

[0012] Preferably, the inner surface of the shell is provided with a plurality of annular oil channels and a plurality of axial oil channels, and the annular oil channels and / or the axial oil channels are connected with the oil inlet channel; the cooling oil enters the annular oil channel and / or the axial oil channel from the oil inlet, flows through the plurality of annular oil channels and the plurality of axial oil channels, and enters the oil inlet channel at the same time; the oil ring also includes a third notch, and the two ends of the axial oil channel are respectively connected with the third notches of the oil ring at both ends; the third notch is also connected with the second notch of the drainage channel; the axial oil channel, the third notch, the drainage channel, the second notch, the annular oil channel and / or the axial oil channel sequentially form a cooling oil circulation path.

[0013] Preferably, the drainage channel is an annular drainage groove, and the cooling oil flows from the second gap to the third gap through the annular drainage groove.

[0014] Preferably, the second gap is an annular gap, and the second holes are symmetrically distributed along the circumference of the second stator punching sheet.

[0015] Preferably, the drainage channel is a drainage hole, and a plurality of the drainage holes are provided between the second gap and the third gap; the cooling oil flows from the second gap to the third gap through the drainage holes.

[0016] Preferably, one end of the communicating groove facing the axis of the stator extends radially into the teeth of the stator.

[0017] Preferably, the number of the first notches is greater than or equal to two, and the plurality of the first notches form an arc-shaped oil inlet channel; the number of the arc-shaped oil inlet channels is one or more; when there are multiple arc-shaped channels, the multiple arc-shaped channels are symmetrically distributed along the circumference of the first stator punching sheet.

[0018] Preferably, the first stator punching sheets are arranged in the middle of the stator, and the number of the first stator punching sheets is 10-20.

[0019] Compared with the existing technology, the above technical solution has the following beneficial effects:

[0020] 1. The stator of the present invention is formed by stacking stator punching sheets. Only the structural design of a single stator punching sheet is required. The required oil passage can be formed on the stator after stamping, thus avoiding the complexity of machining the entire stator.

[0021] 2. The stator of the present invention only requires two stators of different structures to be combined to form the required oil channels on the stamped stator;

[0022] 3. The stator of the present invention can cool the inside of the stator through the first and second cooling oil channels, spray oil to cool the windings at both ends of the stator through the first stator oil channel, and flow oil through the first cooling oil channel to the oil rings at both ends of the stator to cool both ends of the stator; the annular oil channel and the axial oil channel are provided on the inner surface of the housing to cool the stator surface, thereby cooling the entire stator structure and achieving an excellent cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of the first stator punching sheet provided by the present invention;

[0024] Figure 2 A schematic structural diagram of the second stator punching sheet provided by the present invention;

[0025] Figure 3 A schematic structural diagram of the oil ring provided by the present invention;

[0026] Figure 4 A schematic diagram of the oil circuit on the stator provided by the present invention;

[0027] Figure 5 A schematic structural diagram of the annular oil passage and the axial oil passage on the housing provided by the present invention;

[0028] Figure 6 A schematic diagram of the oil circuit of the axial cross section of the stator provided by the present invention;

[0029] Figure 7 A schematic diagram of the oil circuit of the axial cross section of the stator provided by the present invention;

[0030] Figure 8 This is a schematic diagram of the oil circuit of the radial cross section of the stator provided by the present invention.

[0031] Among them: 1-first stator punching sheet, 101-connecting hole, 102-first notch, 2-second stator punching sheet, 201-first hole, 202-second hole, 3-oil ring, 301-second notch, 302-third notch, 4-housing, 401-annular oil channel, 402-axial oil channel, 5-oil inlet, 6-oil inlet channel, 7-connecting groove, 8-first cooling channel, 9-second cooling channel, 10-winding. DETAILED DESCRIPTION

[0032] The advantages of the present invention are further described below with reference to the accompanying drawings and specific embodiments.

[0033] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0034] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0035] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0036] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0038] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention and have no specific meaning. Therefore, "module" and "component" can be used interchangeably.

[0039] See attached Figure 1-8 The present invention discloses an oil-cooled motor, including a stator, which is stamped from a plurality of stator punching sheets. The present invention forms the required oil passages on the stamped stator by superimposing two stator punching sheets with different structures. The stator specifically includes a first stator punching sheet 1 and a second stator punching sheet 2, with the second stator punching sheet 2 being provided at both ends of the first stator punching sheet 1. It can be understood that the first stator punching sheet 1 is the punching sheet in the middle of the stator, and the second stator punching sheet 2 is the punching sheet at both ends of the stator.

[0040] The structures of the first stator punching sheet 1 and the second stator punching sheet 2 are described below respectively, and the related cooling oil channels can be formed by combining the structures.

[0041] The first stator punching sheet 1 is provided with a radial communication hole 101. Several first stator punching sheets 1 are stacked to form an axial communication slot 6 inside the stator. The communication slot 6 can be understood as a rectangular slot, where the length / width of the rectangle represents the radial characteristics of the communication slot 6 (i.e., the radial characteristics of the communication hole 101 of a single punching sheet), and the width / length of the rectangle represents the axial characteristics of the communication slot 6 (i.e., the characteristics formed after the punching sheets are stacked).

[0042] The outer ring of the first stator punching sheet 1 is further provided with a first notch 102, which is connected to the communication hole 101. It can be understood that the stator outer surface is connected to the stator communication groove 6 through the first notch 102. Several first stator punching sheets 1 are stacked to form an oil inlet channel 7 inside the stator, which is connected to the communication groove 6.

[0043] Similarly, the oil inlet passage 7 can be understood as a rectangular groove. The length / width of the rectangle is the radial feature of the oil inlet passage 7 (i.e., the radial feature of the first notch 102 of a single punching sheet), and the width / length of the rectangle is the axial feature of the oil inlet passage 7 (i.e., the feature formed after the punching sheets are stacked).

[0044] A plurality of annularly arranged first holes 201 are provided on the second stator punching sheet 2. The first holes 201 correspond to the positions of the windings 10 at both ends of the stator and the communication groove 6 in the axial direction. A plurality of second stator punching sheets 2 are stacked, so as to form an axial first cooling passage 8 inside the stator. One end of the first cooling passage 8 is connected to the winding 10, and the other end is connected to the communication groove 6.

[0045] It should be noted that in the description of "one end of the first cooling passage 8 is connected to the winding 10, and the other end is connected to the communication groove 6" in the present invention, the first cooling passage 8 is divided into two parts. That is, taking the communication groove 6 as the dividing point, there is a first cooling passage 8 at both ends of the communication groove 6. One end of the divided first cooling passage 8 is connected to the winding 10, and the other end is connected to the communication groove 6. In reality, the first cooling passage 8 should be a structure with both ends connected to the winding 10 and the communication groove 6 in the middle.

[0046] Second holes 202 are also provided on the second stator punching sheet 2. The second holes 202 are arranged on the outer ring of the stator relative to the first holes 201. The second holes 202 correspond to the positions of the oil rings 3 at both ends of the stator and the oil inlet passage 7 in the axial direction. A plurality of second stator punching sheets 2 are stacked, so as to form an axial second cooling passage 9 inside the stator. One end of the second cooling passage 9 is connected to the oil ring 3, and the other end is connected to the oil inlet passage 7.

[0047] Similarly, in the description of "one end of the second cooling passage 9 is connected to the oil ring 3, and the other end is connected to the oil inlet passage 7" in the present invention, the second cooling passage 9 is divided into two parts. That is, taking the oil inlet passage 7 as the dividing point, there is a second cooling passage 9 at both ends of the oil inlet passage 7. One end of the divided second cooling passage 9 is connected to the winding 10, and the other end is connected to the oil inlet passage 7. In reality, the second cooling passage 9 should be a structure with both ends connected to the winding 10 and the oil inlet passage 7 in the middle.

[0048] So far, an oil passage similar to the shape of the Chinese character "tu" can be obtained. That is, the oil inlet passage 7 and the communication groove 6 are connected to form a radial oil passage. First cooling passages 8 and second cooling passages 9 are provided at both ends of the radial oil passage (because second stator punching sheets 2 are provided at both ends of the first stator punching sheet 1). Among them, the first cooling passage 8 leads to the windings 10 at both ends of the stator, and the second cooling passage 9 leads to the oil rings 3 at both ends of the stator.

[0049] The oil ring 3 is provided with a second notch 301 , which is communicated with the second cooling channel 9 , that is, the cooling oil in the second cooling channel 9 flows into the second notch 301 on the oil ring 3 .

[0050] The stator further comprises a housing 4 which is sleeved on the outside of the stator. The housing 4 is provided with an oil inlet 5 which corresponds to the first notch 102 , that is, the oil inlet 5 is connected to the first notch 102 on the stator.

[0051] The cooling oil enters the oil inlet channel 7 on the stator (depending on the structure of the first stator punching 1) from the oil inlet port 5 on the housing 4. A portion of the cooling oil in the oil inlet channel 7 flows radially through the connecting groove 6 into the first cooling channel 8 (depending on the structure of the first stator punching 1), and then flows through the first cooling channel 8 into the windings 10 at both ends of the stator (depending on the structure of the second stator punching 2). The other portion flows through the second cooling channel 9 into the second notch 301 on the oil ring 3 (depending on the structure of the second stator punching 2), so as to achieve cooling of the inside of the stator, the stator windings 10 at both ends of the stator, and the oil rings 3 at both ends of the stator, thereby achieving comprehensive cooling of the stator.

[0052] A plurality of communication holes 101 are arranged along the circumferential direction of the first stator punching sheet 1 , so that an annularly arranged communication groove 6 is formed inside the stator, and cooperates with the annularly arranged first holes 201 to achieve circumferential cooling of the stator.

[0053] It can be understood that the stator's internal cooling includes two paths: one path is the first cooling channel 8, and the other path is the second cooling channel 9. They lead to different parts of the stator at both ends, cooling the oil ring 3 and winding 10 at both ends. The double-layer cooling path with different radial heights also provides better cooling for the stator interior.

[0054] Generally, in order to ensure the stability of the stator structure, based on the principle of having as few slots and openings as possible, the number of the second cooling channels 9 is smaller than the number of the first cooling channels 8 .

[0055] The first notch 102 is understood to be a notch connected to a connecting hole 101, preferably, see the attached Figure 1 The number of the first notches 102 is greater than or equal to two, and the plurality of first notches 102 form an arc-shaped oil inlet channel 7 .

[0056] In order to achieve more uniform cooling, there may be multiple arc-shaped oil inlet channels 7 , and the multiple arc-shaped channels are symmetrically distributed along the circumference of the first stator punching sheet 1 .

[0057] Preferably, the number of the second notch 301 can be one or more. Figure 3The plurality of second notches 301 are symmetrically distributed along the annular direction, so that the second cooling channel 9 can cool the interior of the stator more evenly. In a preferred embodiment provided by the present invention, four second notches 301 are provided.

[0058] Preferably, the number of the second holes 202 is one or more; when there are multiple holes, see the attached Figure 2 , a plurality of second holes 202 form a hole group, and the number of hole groups is consistent with the number of second notches 301. In a preferred embodiment provided by the present invention, four hole groups are provided, and the number of second holes 202 in the same hole group is seven.

[0059] Better, see attached Figure 5 The inner surface of the housing 4 is provided with a plurality of annular oil passages 401 and a plurality of axial oil passages 402. The annular oil passages 401 and / or the axial oil passages 402 are connected to the oil inlet passage 7. Cooling oil enters the annular oil passages 401 and / or the axial oil passages 402 from the oil inlet 5 and simultaneously enters the oil inlet passage 7, flowing through the annular oil passages 401 and the axial oil passages 402 to cool the surface of the stator.

[0060] In order to achieve the reflux of cooling oil in the oil ring 3, the oil ring 3 also includes a third notch 302. The two ends of the axial oil channel 402 are respectively connected to the third notch 302 of the oil ring 3 at both ends of the stator. The third notch 302 is also connected through the second notch 301 of the diversion channel, so that the cooling oil in the second notch 301 can flow back to the annular oil channel 401 and / or the axial oil channel 402 of the housing 4 through the third notch 302.

[0061] It should be noted that the axial oil channel 402, the third notch 302, the drainage channel, the second notch 301, the annular oil channel 401 and / or the axial oil channel 402 of the present invention sequentially form a cooling oil circulation path, so the oil is not necessarily unidirectional in the circulation path. Depending on the oil pump pressure, the flow direction of the oil in the stator may change.

[0062] Specifically, when the second hole 202 on the second stator punching sheet 2 corresponds to the first notch 102 on the first stator punching sheet 1 in the circumferential direction, the oil can radially enter the oil inlet channel 7 from the oil inlet port 5 (and also enter the annular oil channel 401 and / or the axial oil channel 402), then continue to radially enter the connecting groove 6, and enter the first cooling channel 8 and the second cooling channel 9 respectively through the connecting groove 6, and then enter the winding 10 and the oil ring 3 at both ends of the stator respectively, wherein the oil in the second cooling channel 9 enters the second notch 301 of the oil ring 3, and then enters the third notch 302 on the oil ring through the drainage channel, and enters the annular oil channel 401 and / or the axial oil channel 402 from the third notch, thereby achieving cooling of the housing (stator surface), oil ring, stator interior, and winding.

[0063] When the second hole 202 on the second stator punch 2 and the first notch 102 on the first stator punch 1 are staggered in the circumferential direction (see the attached Figure 4 ), the oil cannot enter the oil inlet channel 7 directly after entering from the oil inlet 5. Therefore, at this time, the oil enters the annular oil channel 401 and / or the axial oil channel 402 from the oil inlet 5 and then enters the third notch 302 of the oil ring 3, enters the second notch 301 on the oil ring through the drainage channel, and then enters the second cooling channel 9 of the stator, and then flows to the first cooling channel 8 of the stator through the connecting groove 6, and then flows to the windings 10 at both ends of the stator after passing through the first cooling channel 8, thereby realizing cooling of the housing (stator surface), oil ring, stator interior, and windings.

[0064] Better, see the attached Figure 3 The drainage channel may be an annular drainage groove, through which the cooling oil flows from the second notch 301 to the third notch 302. When the second notch 301 is annular, the radial dimension of the annular drainage groove is smaller than that of the second and third notches.

[0065] In other embodiments, the second notch 301 may be an annular notch, and the second holes 202 are still symmetrically distributed along the circumference of the second stator punching sheet 2 .

[0066] Furthermore, when the second gap 301 is an annular gap, the drainage channel is a drainage hole, and a plurality of drainage holes are provided between the second gap 301 and the third gap 302 to increase the flow rate, and the cooling oil flows from the second gap 301 to the third gap 302 through the plurality of drainage holes.

[0067] Preferably, one end of the communication slot 6 facing the stator axis extends radially into the stator teeth, increasing the radial dimension of the communication slot 6 so as to achieve more thorough cooling of the interior of the stator.

[0068] In a preferred embodiment, the first stator punching sheet 1 is arranged in the middle of the stator, so that the cooling oil is distributed more evenly. Of course, in other embodiments, the first stator punching sheet 1 can also be arranged in the middle of the stator.

[0069] Furthermore, multiple first stator sheet groups can be provided, that is, a plurality of first stator sheet groups form a first stator sheet group, and a plurality of second stator sheet groups form a second stator sheet group, and the first stator sheet group and the second stator sheet group are alternately stacked and stamped, but the second stator sheets 2 are always maintained at both ends of the stator. Moreover, when there are multiple second stator sheet groups, multiple oil inlets 5 can be correspondingly opened on the housing 4.

[0070] Preferably, the number of the first stator punching sheets 1 is 10-20, preferably 15.

[0071] Preferably, an axial channel is provided on the surface of the shell 4 , and the oil inlet 5 is opened between the axial channel and the inner surface of the shell 4 . External cooling oil first enters the axial channel and then enters the oil inlet 5 .

[0072] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An oil-cooled motor, characterized in that: The stator comprises a first stator punching sheet and a second stator punching sheet, wherein the second stator punching sheet is provided at both ends of the first stator punching sheet; The first stator punching sheet is provided with radial communication holes, and a plurality of the communication holes are arranged along the circumferential direction of the first stator punching sheet; a plurality of the first stator punching sheets are stacked to form an axial communication groove inside the stator; The outer ring of the first stator punching sheet is provided with a first notch, which is connected to the communicating hole; a plurality of the first stator punching sheets are stacked to form an oil inlet channel inside the stator, and the oil inlet channel is connected to the communicating groove; The second stator punching sheet is provided with a plurality of annularly arranged first holes, the first holes corresponding to the positions of the windings at both ends of the stator and the communicating groove in the axial direction; a plurality of the second stator punching sheets are stacked to form an axial first cooling channel inside the stator, one end of the first cooling channel is connected to the winding, and the other end is connected to the communicating groove; The second stator punching is further provided with a second hole. The second hole is provided on the outer ring of the stator relative to the first hole. The second hole axially corresponds to the oil rings at both ends of the stator and the oil inlet channel. A plurality of second stator punchings are stacked to form an axial second cooling channel inside the stator. One end of the second cooling channel is connected to the oil ring, and the other end is connected to the oil inlet channel. The oil ring is provided with a second notch, and the second notch is communicated with the second cooling channel; The stator further comprises a housing, the housing being sleeved on the outside of the stator, the housing being provided with an oil inlet, the oil inlet corresponding to the first notch; the inner surface of the housing being provided with a plurality of annular oil passages and a plurality of axial oil passages, the annular oil passages and / or the axial oil passages being in communication with the oil inlet passage; The oil ring also includes a third gap, and both ends of the axial oil channel are respectively connected to the third gaps of the oil rings at both ends; the third gap is also connected to the second gap through the drainage channel; the cooling oil enters the annular oil channel and / or the axial oil channel from the oil inlet, and then enters the oil inlet channel. A part of the cooling oil in the oil inlet channel enters the first cooling channel through the connecting groove, flows through the first cooling channel and enters the windings at both ends of the stator; the other part of the cooling oil flows into the second gap of the oil ring through the second cooling channel to cool the inside of the stator and the stator windings at both ends of the stator, and then flows to the third gap of the oil ring through the drainage channel, and re-enters the axial oil channel and / or the annular oil channel through the third gap to form a circulation path; thereby, the stator surface, the inside of the stator and the windings at both ends of the stator are circulated and cooled.

2. The oil-cooled motor according to claim 1, characterized in that: The number of the second notches is one or more; when there are more than one, the second notches are symmetrically distributed along the annular direction.

3. The oil-cooled motor according to claim 2, characterized in that: The number of the second holes is one or more; when there are more than one, several of the second holes form a hole group, and the number of the hole group is consistent with the number of the second notches.

4. The oil-cooled motor according to claim 1, characterized in that: The drainage channel is an annular drainage groove, and the cooling oil flows from the second gap to the third gap through the annular drainage groove.

5. The oil-cooled motor according to claim 1, characterized in that: The second gap is an annular gap, and the second holes are symmetrically distributed along the circumference of the second stator punching sheet.

6. The oil-cooled motor according to claim 5, characterized in that: The drainage channel is a drainage hole, and a plurality of drainage holes are provided between the second gap and the third gap; The cooling oil flows from the second gap to the third gap through the guide hole.

7. The oil-cooled motor according to claim 1, characterized in that: One end of the communicating groove facing the axis of the stator radially extends into the teeth of the stator.

8. The oil-cooled motor according to claim 1, characterized in that: The number of the first notches is greater than or equal to two, and the plurality of first notches form an arc-shaped oil inlet channel; The number of the arc-shaped oil inlet channels is one or more; when there are multiple arc-shaped channels, the multiple arc-shaped channels are symmetrically distributed along the circumference of the first stator punching sheet.

9. The oil-cooled motor according to claim 1, characterized in that: The first stator punching sheets are arranged in the middle of the stator, and the number of the first stator punching sheets is 10-20.

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