Motor

Abstract

The invention relates to a motor. The motor comprises: a stator (10) comprising a stator core (11) and a plurality of stator windings (12) wound on the stator core (11); a carrier (20) which is connected to the stator core (11) in a rotationally fixed manner; the oil distribution cover (30) is connected to the axial end of the bearing part (20), the oil distribution cover (30) and the bearing part (20) at least partially define a cavity used for containing the stator iron core (11) and the stator winding (12), and the oil distribution cover (30) comprises a cooling liquid inlet, a first cooling liquid outlet (31) and a second cooling liquid outlet (32); and the first cooling liquid channel (C1) is configured to be in fluid communication with the cooling liquid inlet, the first cooling liquid outlet (31) and the second cooling liquid outlet (32), so that cooling liquid can enter the first cooling liquid channel (C1) from the cooling liquid inlet and flow into the cavity through the first cooling liquid outlet (31) and the second cooling liquid outlet (32) to cool the stator (10).

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and more particularly to an electric motor for an electric bridge drive system of a vehicle. Background Art

[0002] The electric bridge drive system of the vehicle includes a motor. The motor includes a stator and a rotor. The stator includes a stator core and a stator winding wound around the stator core. The stator winding includes a concentrated winding and a distributed winding. The motor generates a lot of heat during operation. In order to dissipate the heat of the motor, a coolant (such as oil) is used to flow through the heat-generating components of the motor, such as the stator core.

[0003] One existing heat dissipation solution is to use separate pipes to distribute the coolant to the stator. Figure 1 is a schematic diagram of an electric machine according to one embodiment. Figure 2 is a partially enlarged schematic diagram of a motor according to an embodiment. Figure 3 is a partial cross-sectional schematic diagram of a motor according to an embodiment.

[0004] like Figures 1 to 3 As shown, the stator of the motor includes a stator carrier 1, a stator core 2 located on the inner peripheral side of the stator carrier 1, and a stator winding 3 wound on the stator core 2. The stator winding 3 protrudes from the stator core 2 at both ends in the axial direction. A pipe 4 for supplying coolant is provided on the outer periphery of the stator. The coolant can flow into the pipe 4 from the transmission or the coolant pump in the electric bridge drive system. Then, the coolant can flow out from the opening of the pipe 4 and flow to the outer peripheral surface of the stator carrier 1. The stator carrier 1 includes a plurality of through holes 5 so that the coolant from the pipe 4 flows radially inward to the stator core 2 and the stator winding 3 for cooling.

[0005] In this heat dissipation scheme, the pipeline is arranged on the radial outside of the stator carrier, so the motor requires a larger radial space in the electric bridge drive system. In addition, at least two components are required to transport the coolant to the stator carrier and the stator winding respectively. However, due to the limited overall radial size of the electric bridge drive system, the pipeline cannot be too large. Small-sized pipelines will aggravate the pressure drop of the coolant in the pipeline, so a more powerful coolant pump is required. Since the outer surface of the stator carrier is cooled, the coolant needs to flow from top to bottom, so the pipeline needs to be arranged on the upper side of the motor.

[0006] Therefore, there is a need for an electric machine having coolant passages with reduced radial dimensions. Summary of the invention

[0007] One object of the present invention is to provide a motor having a coolant passage with a reduced radial dimension. Another object of the present invention is to provide a motor having a coolant passage that can be manufactured at low cost. Another object of the present invention is to provide a motor having a coolant passage that can simplify the structure. Another object of the present invention is to provide a motor having a coolant passage that is easy to assemble.

[0008] One aspect of the present invention provides an electric motor, comprising: a stator, including a stator core and a plurality of stator windings wound on the stator core; a carrier, which is connected to the stator core in a torsionally rigid manner; an oil distribution cover, which is connected to an axial end of the carrier to at least partially define a cavity for accommodating the stator core and the stator windings with the carrier, wherein the oil distribution cover includes a coolant inlet, a first coolant outlet, and a second coolant outlet; and a first coolant channel, which is configured to be fluidly connected to the coolant inlet, the first coolant outlet, and the second coolant outlet, respectively, so that the coolant can enter the first coolant channel from the coolant inlet and flow into the cavity through the first coolant outlet and the second coolant outlet to cool the stator.

[0009] According to certain embodiments of the present invention, the motor further comprises: a housing, which is torsionally connected to an oil distribution cover, wherein the oil distribution cover is arranged on the radial inner side of the housing, the first coolant channel is formed by a first open groove located on the oil distribution cover and an inner circumferential wall of the housing, and the opening of the first open groove is configured to face radially outward.

[0010] According to some embodiments of the present invention, the motor further comprises: a second coolant channel configured to be fluidically connected to the first coolant channel via the first coolant outlet to cool the stator winding; and / or a third coolant channel configured to be fluidically connected to the first coolant channel via the second coolant outlet to cool the stator core.

[0011] According to some embodiments of the present invention, the stator is configured to define an axially extending gap between every two adjacent stator windings, and the second coolant channel is formed by a second open groove located on the oil distribution cover and the gap between the stator windings, and the opening of the second open groove is configured to face the stator winding in the axial direction.

[0012] According to some embodiments of the present invention, the stator core is disposed radially inside the carrier, and the third coolant channel is formed by a third open groove on the stator core and an inner peripheral wall of the carrier, and the opening of the third open groove is configured to face radially outside.

[0013] According to some embodiments of the present invention, the motor further comprises: a fourth coolant channel, which is composed of a through hole radially penetrating the bearing member, and a flow channel radially arranged between the bearing member and the housing.

[0014] According to certain embodiments of the present invention, the oil distribution cap has a generally annular structure.

[0015] According to some embodiments of the present invention, the electric machine includes a plurality of third coolant passages, the oil distribution cover includes a plurality of second coolant outlets, and each second coolant outlet is configured to be in fluid communication with one of the third coolant passages, respectively.

[0016] One aspect of the present invention provides an electric bridge drive system, comprising: a motor according to an embodiment of the present invention; and a transmission, wherein a coolant inlet of an oil distribution cap of the motor is configured to be in fluid communication with the transmission to receive coolant from the transmission.

[0017] One aspect of the present invention provides a vehicle including a motor according to an embodiment of the present invention.

[0018] According to an embodiment of the present invention, the coolant can be received through the coolant inlet of the oil distribution cover and the coolant can be supplied to the internal cavity of the motor through the coolant outlet of the oil distribution cover, so that the coolant channel of the motor does not need to be arranged on the radial outside of the motor, thereby reducing the radial size of the motor. The oil distribution cover is arranged at the axial end of the motor, which can reduce the occupation of the radial space. Different coolant channels can be constructed in the motor to cool the stator core, the stator winding, the bearing, etc. respectively, thereby more conveniently distributing the coolant and improving the cooling efficiency. The coolant channel for the stator core and the coolant channel for the stator winding can be separately arranged and can have a larger size, thereby reducing the pressure drop of the coolant and not needing to be equipped with a high-power coolant pump. The oil distribution cover can be connected to different coolant channel fluids through different coolant outlets, and the position and number of the coolant outlets of the oil distribution cover can be more flexibly arranged, thereby further optimizing the coolant distribution and improving the cooling efficiency. By using the oil distribution cover to distribute coolant to different parts of the motor, the cooling structure design and assembly for the motor can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a motor according to one embodiment.

[0020] Figure 2 is a partially enlarged schematic diagram of a motor according to an embodiment.

[0021] Figure 3 is a partial cross-sectional schematic diagram of a motor according to an embodiment.

[0022] Figure 4 is a partial cross-sectional schematic diagram of a motor according to an embodiment of the present invention.

[0023] Figure 5is another partial cross-sectional schematic diagram of a motor according to an embodiment of the present invention.

[0024] Figure 6 is a schematic diagram of an oil distribution cover according to an embodiment of the present invention.

[0025] Figure 7 1 is a partially enlarged schematic diagram of an oil distribution cover according to an embodiment of the present invention.

[0026] Figure 8 is an axial schematic diagram of a stator according to an embodiment of the present invention.

[0027] Fig. 9 is a schematic diagram of a second coolant channel of a motor according to an embodiment of the present invention.

[0028] Fig.10 is a schematic diagram of a third coolant channel of a motor according to an embodiment of the present invention.

[0029] Fig.11 is a schematic diagram of a fourth coolant channel of a motor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present invention are described with reference to the accompanying drawings. The following detailed description and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, and the present invention is not limited to the preferred embodiments described. The scope of the present invention is defined by the claims. The present invention is now described in detail with reference to exemplary embodiments, and some embodiments are illustrated in the accompanying drawings. The following description is made with reference to the accompanying drawings, and unless otherwise indicated, the same reference numerals in different drawings represent the same or similar elements. The schemes described in the following exemplary embodiments do not represent all schemes of the present invention. On the contrary, these schemes are merely examples of systems and methods of various aspects of the present invention involved in the appended claims.

[0031] The present invention provides a motor. The motor according to an embodiment of the present invention can be installed in an electric bridge drive system. The electric bridge drive system can be installed in an electric vehicle or a fuel cell vehicle with a motor as a drive source, or a hybrid vehicle with both a motor and an internal combustion engine as drive sources. Below, exemplary embodiments of the present invention are described with reference to the accompanying drawings. It should be understood that only certain embodiments of the present invention are shown in the accompanying drawings, and the scope of the present invention should be determined according to the claims. In this article, "axial" means the axial direction of the motor, which is parallel to the extension direction of the drive shaft in the electric bridge drive system; "radial" means the radial direction of the motor, which is perpendicular to the axial direction of the motor; "circumferential" means the circumferential direction of the motor.

[0032] Figure 4 is a partial cross-sectional schematic diagram of a motor according to an embodiment of the present invention. Figure 5is another partial cross-sectional schematic diagram of a motor according to an embodiment of the present invention. Figure 6 is a schematic diagram of an oil distribution cover according to an embodiment of the present invention. Figure 7 1 is a partially enlarged schematic diagram of an oil distribution cover according to an embodiment of the present invention. Figure 8 is an axial schematic diagram of a stator according to an embodiment of the present invention. Fig. 9 is a schematic diagram of a second coolant channel of a motor according to an embodiment of the present invention. Fig.10 is a schematic diagram of a third coolant channel of a motor according to an embodiment of the present invention. Fig.11 is a schematic diagram of a fourth coolant channel of a motor according to an embodiment of the present invention.

[0033] like Figure 4 As shown, the motor includes a stator 10, a rotor (not shown), a bearing 20, an oil distribution cover 30 and a housing 40. The stator 10 and the rotor are coaxially arranged. The stator 10, the rotor, the bearing 20 and the oil distribution cover 30 are arranged in a cavity surrounded by the housing 40.

[0034] The motor may be arranged in an electric bridge drive system. In an exemplary embodiment, the housing 40 is a part of the housing of the electric bridge drive system, such as a transmission housing. In an exemplary embodiment, the motor is a concentrated winding motor.

[0035] The stator 10 includes a stator core 11 and a stator winding 12. The stator core 11 is connected to a carrier 20 in a torsionally fixed manner. In the exemplary embodiment, the stator core 11 and the stator winding 12 are arranged radially inside the carrier 20. The stator winding 12 is wound on the stator core 11 and protrudes from the stator core 11 at both axial ends.

[0036] In the exemplary embodiment, the stator core 11 includes an outer ring portion and a plurality of teeth portions (not shown) extending radially inward from the outer ring portion. The teeth portions are evenly spaced along the circumferential direction. A stator winding 12 is wound around each tooth portion of the stator core 11. There is a gap 13 between two adjacent stator windings 12, such as Figure 8 The gap 13 between two adjacent stator windings 12 may extend in the axial direction to penetrate the stator windings 12. It should be understood that the two adjacent stator windings 12 may be partially in contact with each other to form the gap 13.

[0037] The rotor (not shown) is disposed radially inside the stator 10 and is rotatable relative to the stator 10 .

[0038] The oil distribution cover 30 is arranged at the axial end of the motor. Figure 4As shown. In the exemplary embodiment, the oil distribution cover 30 is connected to one axial end of the carrier 20. Thus, the oil distribution cover 30 and the carrier 20 can enclose a cavity that at least partially accommodates the stator core 11 and the stator winding 12. In the exemplary embodiment, the oil distribution cover 30 is disposed on the radial inner side of the housing 40 and is connected to the housing 40 in a rotationally fixed manner. In addition, the carrier 20 can be disposed on the radial inner side of the housing 40.

[0039] In an exemplary embodiment, the oil distribution cover 30 has a generally annular structure, such as Figure 6 According to an embodiment of the present invention, Figure 6 and Figure 7 As shown, the oil distribution cap 30 includes a coolant inlet (not shown), a first coolant outlet 31 and a second coolant outlet 32. The coolant inlet is used to receive coolant from the electric bridge drive system. In some embodiments, the coolant inlet is in fluid communication with the transmission of the electric bridge drive system to receive coolant from the transmission. The coolant can be lubricating oil.

[0040] According to an embodiment of the present invention, the motor further comprises a first cooling liquid channel C1, such as Figure 6 The first coolant channel C1 is in fluid communication with the coolant inlet, the first coolant outlet 31 and the second coolant outlet 32 ​​respectively. In some embodiments, the coolant from the electric bridge drive system can flow into the first coolant channel C1 through the coolant inlet.

[0041] In the exemplary embodiment, the first coolant channel C1 is formed by the first open groove 33 located on the oil distribution cover 30 and the inner peripheral wall of the housing 40. Figure 4 and Figure 5 The opening of the first open groove 33 of the oil distribution cover 30 faces radially outward, as shown in FIG. Figure 6 As shown. In some embodiments, the outer peripheral wall of the oil distribution cover 30 is partially recessed radially inward to form a first open groove 33. The first open groove 33 may extend continuously along the circumference of the oil distribution cover 30 to form a ring shape. When the oil distribution cover 30 and the housing 40 are connected to each other, the inner peripheral wall of the housing 40 and the first open groove 33 are engaged to form a complete first coolant channel C1. The first open groove 33 is fluidly connected to the coolant inlet, the first coolant outlet 31 and the second coolant outlet 32, respectively, as shown in FIG. Figure 6 and Figure 7 As shown, the coolant from the electric bridge drive system can enter the first coolant channel C1 through the coolant inlet, and flow out from the first coolant channel C1 through the first coolant outlet 31 and the second coolant outlet 32 ​​respectively.

[0042] According to an embodiment of the present invention, the motor further comprises a second cooling liquid channel C2, such as Fig. 9 and Fig.11 The second coolant channel C2 is in fluid communication with the first coolant channel C1 through the first coolant outlet 31 . The second coolant channel C2 can receive the coolant from the first coolant channel C1 to cool the stator winding 12 .

[0043] In the exemplary embodiment, the second coolant channel C2 is formed by a second open groove 34 located on the oil distribution cover 30 and a gap 13 (such as Figure 8 The second open groove 34 of the oil distribution cover 30 is formed as shown in the figure. The opening of the second open groove 34 of the oil distribution cover 30 is axially oriented toward the stator winding 12. The second open groove 34 can be continuously extended along the circumference of the oil distribution cover 30 to form a ring shape. When the oil distribution cover 30 and the stator 10 are respectively connected to the carrier 20, the gap 13 between the second open groove 34 of the oil distribution cover 30 and the stator winding 12 forms a complete second coolant channel C2. In an exemplary embodiment, the second coolant channel C2 is arranged radially inside the first coolant channel C1. In some embodiments, the first coolant channel C1 and the second coolant channel C2 are separated from each other by at least a portion of the outer peripheral wall of the oil distribution cover 30.

[0044] According to an embodiment of the present invention, the motor further comprises a third coolant channel C3, such as Fig.10 The third coolant channel C3 is in fluid communication with the first coolant channel C1 through the second coolant outlet 32. The third coolant channel C3 can receive coolant from the first coolant channel C1 to cool the stator core 11.

[0045] In an exemplary embodiment, the third coolant channel C3 is formed by the third open groove 14 located on the stator core 11 and the inner peripheral wall of the carrier 20. Figure 8 and Fig.10 The third open groove 14 extends axially to penetrate the entire stator core 11. The opening of the third open groove 14 faces radially outward, as shown in FIG. Figure 8 In some embodiments, the outer peripheral wall of the stator core 11 is partially recessed radially inward to form a third open groove 14. When the stator core 11 and the carrier 20 are connected to each other, the third open groove 14 on the stator core 11 and the inner peripheral wall of the carrier 20 are engaged to form a complete third coolant channel C3.

[0046] In some embodiments, the first coolant passage C1 and the third coolant passage C3 are separated from each other by at least a portion of the outer peripheral wall of the oil distribution cover 30. In addition, the second coolant passage C2 and the third coolant passage C3 may be separated from each other.

[0047] In some embodiments, the stator core 11 forms a plurality of third coolant channels C3, and the oil distribution cover 30 includes a plurality of second coolant outlets 32, each of which is fluidically connected to a third coolant channel C3. In some embodiments, each third open groove 14 is arranged to correspond to a tooth portion of the stator core 11.

[0048] In some embodiments, the motor may further include a fourth coolant channel C4, such as Fig.11 The fourth coolant channel C4 can cool the carrier 20 . The fourth coolant channel C4 is in fluid communication with the first coolant channel C1 through the second coolant outlet 32 ​​.

[0049] In an exemplary embodiment, the fourth coolant channel C4 is composed of a through hole 21 that penetrates the support member 20 in the radial direction, and a flow channel 22 that is arranged in the radial direction between the support member 20 and the housing 40. Fig.11 In the exemplary embodiment, the through hole 21 is arranged to extend in the radial direction and is in fluid communication with the second coolant outlet 32 ​​of the oil distribution cover 30 .

[0050] The first coolant channel is described above as being formed by the first open groove 33 located on the oil distribution cover 30 and the inner peripheral wall of the housing 40. However, the present invention is not limited thereto. In other embodiments, the first coolant channel may also be formed by an open groove provided on the housing 40 and the outer peripheral wall of the oil distribution cover 30, or by an open groove provided on the housing 40 and an open groove provided on the oil distribution cover 30.

[0051] The third coolant channel is described above as being composed of the third open groove 14 located on the stator core 11 and the inner peripheral wall of the carrier 20. However, the present invention is not limited thereto. In some embodiments, the third coolant channel may be composed of a closed groove completely disposed in the stator core 11. Alternatively, in some embodiments, the third coolant channel may be composed of an open groove disposed on the carrier 20 and the outer peripheral wall of the stator core 11.

[0052] According to an embodiment of the present invention, the coolant can enter from the coolant inlet of the oil distribution cover 30 into the first coolant channel C1 formed by the first open groove 33 located on the oil distribution cover 30 and the inner peripheral wall of the housing 40, and flow from the first coolant channel C1 into the cavity for accommodating the stator core 11 and the stator winding 12 via the first coolant outlet 31 and the second coolant outlet 32 ​​of the oil distribution cover 30. The coolant from the first coolant outlet 31 can flow into the second coolant channel C2 formed by the second open groove 34 located on the oil distribution cover 30 and the gap 13 between the stator windings 12 to cool the stator windings 12, as shown in FIG. Fig. 9 and Fig.11The coolant from the second coolant outlet 32 ​​can flow to the third coolant channel C3 formed by the third open groove 14 located on the stator core 11 and the inner peripheral wall of the carrier 20 to cool the stator core 11. Fig.10 In addition, the coolant from the second coolant outlet 32 ​​can also flow to the fourth coolant channel C4, which is composed of a through hole 21 that radially penetrates the carrier 20 and a flow channel 22 that is radially arranged between the carrier 20 and the housing 40, so that the carrier 20 can be cooled.

[0053] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the configuration and method of the above-described embodiments. On the contrary, the present invention is intended to cover various modifications and equivalent configurations. In addition, although the various elements and method steps of the disclosed invention are shown in various exemplary combinations and configurations, other combinations including more or less elements or methods also fall within the scope of the present invention.

[0054] Reference numerals list

[0055] 1 stator carrier;

[0056] 2 stator core;

[0057] 3. Stator winding;

[0058] 4 Pipeline;

[0059] 5 through holes;

[0060] 10 stator;

[0061] 11 stator core;

[0062] 12 stator winding;

[0063] 13 gap;

[0064] 14 third open groove;

[0065] 20 bearing members;

[0066] 21 through hole;

[0067] 22 flow channel;

[0068] 30 Oil distribution cap;

[0069] 31 first coolant outlet;

[0070] 32 second coolant outlet;

[0071] 33 first open groove;

[0072] 34 second open groove;

[0073] 40 housing;

[0074] C1 first coolant channel;

[0075] C2 second coolant channel;

[0076] C3 third coolant channel;

[0077] C4 4th coolant channel.

Claims

1. A motor, comprising: A stator (10) comprising a stator core (11) and a plurality of stator windings (12) wound around the stator core (11); A carrier (20) connected to the stator core (11) in a rotationally fixed manner; an oil distribution cover (30) connected to an axial end of the carrier (20) to at least partially define with the carrier (20) a cavity for accommodating the stator core (11) and the stator winding (12), wherein the oil distribution cover (30) includes a coolant inlet, a first coolant outlet (31) and a second coolant outlet (32); and A first coolant channel (C1) is configured to be in fluid communication with the coolant inlet, the first coolant outlet (31) and the second coolant outlet (32), respectively, so that coolant can enter the first coolant channel (C1) from the coolant inlet and flow into the cavity through the first coolant outlet (31) and the second coolant outlet (32) to cool the stator (10).

2. The electric machine according to claim 1, further comprising: a housing (40) which is connected to the oil distribution cover (30) in a rotationally fixed manner, The oil distribution cover (30) is arranged on the radial inner side of the housing (40), the first coolant channel (C1) is composed of a first open groove (33) located on the oil distribution cover (30) and the inner peripheral wall of the housing (40), and the opening of the first open groove (33) is configured to face radially outward.

3. The electric machine according to claim 1, further comprising: a second coolant channel (C2) configured to be in fluid communication with the first coolant channel (C1) via the first coolant outlet (31) to cool the stator winding (12); and / or A third coolant passage (C3) is configured to be in fluid communication with the first coolant passage (C1) via the second coolant outlet (32) to cool the stator core (11).

4. The motor according to claim 3, wherein: The stator (10) is configured to define a gap (13) extending in the axial direction between each two adjacent stator windings (12), and The second coolant channel (C2) is formed by a second open groove (34) located on the oil distribution cover (30) and the gap (13) located between the stator windings (12), and the opening of the second open groove (34) is configured to face the stator winding (12) in the axial direction.

5. The motor according to claim 3, wherein: The stator core (11) is arranged radially inside the carrier (20), and The third coolant channel (C3) is formed by a third open groove (14) located on the stator core (11) and the inner peripheral wall of the carrier (20), and the opening of the third open groove (14) is configured to face radially outward.

6. The electric machine according to any one of claims 1 to 5, further comprising: The fourth coolant channel (C4) is composed of a through hole (21) radially penetrating the support member (20) and a flow channel (22) radially arranged between the support member (20) and the housing (40).

7. The motor according to any one of claims 1 to 5, wherein: The oil distribution cover (30) has a substantially annular structure.

8. The motor according to any one of claims 1 to 5, wherein: The electric machine includes a plurality of third coolant passages (C3), the oil distribution cover (30) includes a plurality of second coolant outlets (32), and each second coolant outlet (32) is configured to be in fluid communication with one of the third coolant passages (C3).

9. An electric bridge drive system, comprising: The motor according to any one of claims 1 to 8; and A transmission, wherein the coolant inlet of the oil distribution cap (30) of the motor is configured to be in fluid communication with the transmission to receive coolant from the transmission.

10. A vehicle comprising the electric machine according to any one of claims 1 to 8.

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