Cooling system of motor, motor and vehicle

Abstract

The invention relates to a cooling system of a motor, the motor and a vehicle. The motor comprises a shell, a stator accommodated in the shell and a cooling ring, the stator is provided with a first end part and a second end part along the axis direction of the motor, the cooling ring is arranged at the first end part and the second end part, the cooling system comprises an axial flow channel, the axial flow channel comprises an inlet for receiving an external cooling medium, the axial flow channel is positioned between the first end part and the second end part and is formed by the inner wall of the shell and the outer wall of the stator; the cooling ring flow channel is located on the outer surface of the cooling ring and formed by the inner wall of the shell and the outer surface of the cooling ring, and the cooling ring flow channel is in fluid communication with the axial flow channel so that the cooling medium can alternately flow through the axial flow channel and the cooling ring flow channel at any end. And then the cooling water flows out of the axial flow channel to outlets in the cooling water flow channels at the two ends.

Description

Technical Field

[0001] The present disclosure relates to a cooling system for a motor, and a motor and a vehicle including the cooling system. Background Art

[0002] With the rapid development of automobiles, the pursuit of high efficiency of automotive motors is becoming a trend. The resulting challenge of motor temperature rise is becoming increasingly severe. Therefore, a more efficient cooling system is urgently needed to promptly remove the heat generated by the motor during operation. Otherwise, the motor temperature will easily rise too high, which will affect the performance at the least and lead to winding burning, magnetic steel demagnetization, bearing damage and other consequences at the worst, seriously affecting the service life of the motor.

[0003] Existing motors often have cooling channels around the stator core, and cooling rings are provided at both ends of the stator core. The cooling medium is sprayed on the stator winding in a directional manner through the spray holes on the cooling rings. However, the cooling medium is often divided into two paths, one flowing through the stator core to cool the stator core, and the other flowing through the cooling ring to cool the stator winding. Compared with the cooling medium being used entirely for cooling the stator core, the cooling effect is reduced. Summary of the invention

[0004] The present disclosure aims to provide a cooling system for a motor and a motor and a vehicle comprising the cooling system. The cooling system has an ingenious structure so that the cooling medium can be first used to cool the surface of the stator core. After the stator core is cooled, the windings at both ends of the stator are cooled, thereby achieving a better cooling effect.

[0005] This object is achieved by a cooling system for an electric machine and an electric machine and a vehicle including the cooling system according to the present disclosure as described below.

[0006] At least one embodiment of the present disclosure provides a cooling system for a motor, including a shell, a stator accommodated in the shell, and a cooling ring, wherein the stator has a first end and a second end along the axis of the motor, and the cooling ring is arranged at the first end and the second end, and the cooling system includes: an axial flow channel, including an inlet for receiving an external cooling medium, the axial flow channel is located between the first end and the second end and is formed by an inner wall of the shell and an outer wall of the stator; a cooling ring flow channel, located on the outer surface of the cooling ring and is formed by the inner wall of the shell and the outer surface of the cooling ring, the cooling ring flow channel is fluidly connected to the axial flow channel so that the cooling medium alternately flows through the axial flow channel and the cooling ring flow channel at either end, and then flows out from the axial flow channel to outlets on the cooling ring flow channels at both ends.

[0007] In the cooling system provided in at least one embodiment of the present disclosure, the cooling ring includes baffle ribs and baffles extending in the circumferential direction to form a cooling circulation channel, wherein the cooling circulation channel includes a first circumferential flow channel close to the stator end and a second circumferential flow channel away from the stator end, and the baffle ribs have an opening portion.

[0008] In the cooling system provided by at least one embodiment of the present disclosure, the first circumferential flow channel is fluidly connected to the axial flow channel so that the cooling medium alternately flows through the axial flow channel and the first circumferential flow channel at either end, and then flows out of the axial flow channel and flows into the second circumferential flow channel through the opening of the baffle rib.

[0009] In the cooling system provided by at least one embodiment of the present disclosure, an outlet of the cooling circulation channel is provided on the second circumferential flow channel, and the outlet is configured to apply cooling medium to the stator coils at the first end and the second end.

[0010] In the cooling system provided by at least one embodiment of the present disclosure, the outlets are spray holes circumferentially spaced apart on the cooling ring.

[0011] In the cooling system provided by at least one embodiment of the present disclosure, the axial flow channel includes a first flow channel rib disposed on the stator, and the first flow channel rib is configured to extend uninterruptedly in the axial direction to contact at least a portion of the baffle rib.

[0012] In the cooling system provided by at least one embodiment of the present disclosure, the axial flow channel also includes second flow channel ribs arranged on the inner wall of the shell, grooves are formed between the second flow channel ribs, and the first flow channel ribs are clamped with the grooves.

[0013] In the cooling system provided by at least one embodiment of the present disclosure, the axial flow channel also includes a third flow channel rib that is only arranged on the inner wall of the shell and adjacent to the inlet, and the third flow channel rib is configured to extend in the axial direction and have an opening portion so that the cooling medium flows out from the axial flow channel to the cooling circulation channels at both ends.

[0014] In the cooling system provided by at least one embodiment of the present disclosure, the opening portion of the third flow channel rib is arranged at a middle position of the third flow channel rib.

[0015] In the cooling system provided by at least one embodiment of the present disclosure, a protrusion is provided on the cooling ring, and when the motor is assembled, the groove is snap-fitted with the protrusion.

[0016] In the cooling system provided by at least one embodiment of the present disclosure, the protrusion includes a first protrusion provided on the baffle rib and / or a second protrusion provided on the baffle plate.

[0017] In the cooling system provided by at least one embodiment of the present disclosure, the second flow channel rib and the third flow channel rib are interference fit with the outer surface of the stator.

[0018] In the cooling system provided by at least one embodiment of the present disclosure, the side surface of the first flow channel rib is interference fit with the side surface of the groove.

[0019] At least one embodiment of the present disclosure further provides an electric machine, which includes the cooling system provided by at least one embodiment of the present disclosure.

[0020] At least one embodiment of the present disclosure further provides a vehicle, which includes the motor provided by at least one embodiment of the present disclosure.

[0021] The advantages of the technical solution disclosed in the present invention are as follows: the cooling system has an ingenious structure, so that the cooling medium can be first used to cool the surface of the stator core, and then cool the windings at both ends of the stator, thereby achieving a better cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. The following drawings are not deliberately scaled according to the actual size, and the focus is on illustrating the main purpose of the present disclosure.

[0023] Figure 1 A disassembled diagram of a motor provided according to at least one embodiment of the present disclosure;

[0024] Figure 2 An assembled perspective view of a stator and a cooling ring provided according to at least one embodiment of the present disclosure;

[0025] Figure 3 A perspective view of a housing provided according to at least one embodiment of the present disclosure;

[0026] Figure 4 A top view of a cooling ring provided according to at least one embodiment of the present disclosure;

[0027] Figure 5 for Figure 1 A perspective view of the motor in its assembled state; and

[0028] Figure 6 The present invention is a schematic diagram of a flow path of a cooling system for a motor provided according to at least one embodiment of the present disclosure.

[0029] Throughout the drawings, the same or similar components are indicated by the same reference numerals.

[0030] Reference numerals:

[0031] 1 Motor

[0032] 2 Shell

[0033] 3. Stator

[0034] 4 Cooling ring

[0035] 5 Opening

[0036] 6 Opening

[0037] 11Entrance

[0038] 12Exit

[0039] 10 Axial flow channel

[0040] 20 Cooling circulation channel

[0041] 21 First circumferential flow channel

[0042] 22 Second circumferential flow channel

[0043] 23Entrance

[0044] 31 First-rate Doujin

[0045] 32 stator wire package

[0046] 41 baffle rib

[0047] 42 baffle

[0048] 201 The second stream of tendons

[0049] 202 Third-rate Doujin

[0050] 203 slots

[0051] 411 First Bump

[0052] 421 Second bulge. DETAILED DESCRIPTION

[0053] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure.

[0054] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those of ordinary skill in the art to which the present disclosure belongs. The words "first", "second" and similar terms used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0055] Figure 1 The figure is a disassembled diagram of a motor 1 provided according to at least one embodiment of the present disclosure.

[0056] like Figure 1As shown, the motor 1 includes a housing 2, a stator 3 accommodated in the housing 2, and a cooling ring 4. The stator 3 has a first end and a second end along the motor axis direction. The cooling ring 4 is arranged at the first end and the second end of the stator 3, and the cooling ring 4 surrounds the stator coil 32 at both ends of the stator 3. The cooling ring is an annular structure, usually made of metal material, and is provided with a spray hole, for example. When the motor is running, the cooling ring will rotate continuously, and the spray hole will continuously spray cooling medium (for example, oil) and apply it to the stator coil at the first end and the second end. In this way, the temperature of the motor will be effectively reduced, thereby ensuring the normal operation of the motor. The stator 3 is provided with a first flow channel rib 31, which is a strip-shaped protrusion, which is axially arranged along the outer surface of the stator 3 and is configured to extend uninterruptedly in the axial direction to contact at least a part of the baffle rib 41. The first flow channel rib 31 is integrally formed with the stator 3. In this embodiment, the first flow channel rib 31 has a constant shape in the axial direction, so that only one type of stator lamination is required, thereby saving model costs. A circumferentially extending baffle rib 41 is provided at a position of the cooling ring 4 close to the stator end, and a circumferentially extending baffle plate 42 is provided at a position of the cooling ring 4 away from the stator end, and the baffle rib 41 has an opening 5. Spray holes are circumferentially spaced on the cooling ring 4 between the baffle rib 41 and the baffle plate 42, and these spray holes are outlets 12 for the cooling medium. An inlet 23 for receiving an external cooling medium is provided on the housing 2. Figure 1 The assembled structure of the motor shown is as follows Figure 5 shown.

[0057] The motor 1 includes a cooling system according to at least one embodiment of the present disclosure. Figures 2 to 6 The cooling system provided by the embodiment of the present disclosure is specifically described.

[0058] like Figure 2 and Figure 6 As shown, the cooling system includes an axial flow channel 10 and a cooling annular flow channel 20. The axial flow channel 10 includes an inlet 11 for receiving an external cooling medium, the inlet 11 is fluidically connected to an inlet 23 on the housing 2, and the axial flow channel 10 is located between the first end and the second end of the stator 3 and is formed by the inner wall of the housing and the outer wall of the stator. The cooling annular flow channel 20 is located on the outer surface of the cooling ring 4 and is formed by the inner wall of the housing and the outer surface of the cooling ring. The cooling annular flow channel 20 is fluidically connected to the axial flow channel 10 so that the cooling medium alternately flows through the axial flow channel 10 and the cooling annular flow channel 20 at either end, and then flows out from the axial flow channel 10 to the outlet 12 on the cooling annular flow channel 20 located at both ends.

[0059] Specifically, the cooling annular flow channel 20 includes a first circumferential flow channel 21 close to the end of the stator and a second circumferential flow channel 22 away from the end of the stator, the first circumferential flow channel 21 is formed by the baffle ribs 41, the second circumferential flow channel 22 is formed by the baffle ribs 41 and the baffle 42, and the outlet 12 of the cooling annular flow channel 20 is provided on the second circumferential flow channel 22. The first circumferential flow channel 21 is in fluid communication with the axial flow channel 10 so that the cooling medium alternately flows through the axial flow channel 10 and the first circumferential flow channel 21 at either end, then flows out of the axial flow channel 10, and flows into the second circumferential flow channel 22 through the opening 5 of the baffle rib 41.

[0060] In some embodiments of the present disclosure, the axial flow channel includes a second flow channel rib and a third flow channel rib in addition to the first flow channel rib. Figure 3 As shown, the second channel rib 201 and the third channel rib 202 are arranged on the inner wall of the shell, and the third channel rib 202 is adjacent to the inlet 11. A groove 203 is formed between the second channel ribs 201, and the groove 203 is used to engage with the first channel rib 31. The third channel rib 202 is configured to extend in the axial direction and have an opening 6, so that the cooling medium flows out from the axial channel 10 to the cooling circulation channel 20 at both ends. The use of the third channel rib 202 with the opening 6 can avoid the use of different types of stator laminations, because if the opening is set on the first channel rib 31, different types of stator laminations need to be used, which will increase the cost. For example, in this embodiment, the opening 6 is set in the middle position of the third channel rib 202. Setting the opening 6 in the middle position of the third channel rib 202 can make the cooling medium flow evenly to both ends of the stator, so that the cooling effect is uniform. It should be noted that the opening 6 can also be set at other positions, and the present disclosure does not limit this.

[0061] In some embodiments of the present disclosure, a protrusion is provided on the cooling ring, and the protrusion includes a first protrusion provided on the baffle rib and / or a second protrusion provided on the baffle plate. Figure 4 As shown, the baffle 41 is provided with a first protrusion 411, and the baffle 41 is provided with a second protrusion 421. The first protrusion 411 and the second protrusion 421 are used to engage with the groove 203 to fix the cooling ring 4. Other specific structures of the cooling ring 4 have been described above and will not be repeated here. It should be noted that the spray hole on the cooling ring 4 is only an example, and it can also be other structures for the cooling medium to pass through, and the present disclosure does not limit this.

[0062] In some embodiments of the present disclosure, the second flow channel rib 201 and the third flow channel rib 202 are interference fit with the outer surface of the stator 3, and the side surface of the first flow channel rib 31 is interference fit with the side surface of the groove 203, thereby preventing the stator 3 from axially moving in the housing 2. In addition, the first flow channel rib 31 is engaged with the groove 203 to prevent the stator 3 from circumferentially rotating in the housing 2.

[0063] Figure 6 The present invention is a schematic diagram of a flow path of a cooling system provided according to at least one embodiment of the present disclosure.

[0064] For example, in the assembled state of the motor, the cooling system includes N axial flow channels 10 (the first axial flow channel, the second axial flow channel, ..., the Nth axial flow channel), where N is a positive integer greater than 1. The outer surface of the electronic core is divided into the first axial flow channel to the Nth axial flow channel in sequence by the first flow channel rib 31, the second flow channel rib 201 and the third flow channel rib 202. The cooling medium first enters the first axial flow channel through the inlet 11. The baffle rib 41 cooperates with the structure of the first flow channel rib 31 to make the cooling medium flow in a serpentine shape and prevent the cooling medium from flowing to the outlet 12 when flowing in the first axial flow channel to the N-1th axial flow channel.

[0065] like Figure 6 As shown, the cooling medium first flows into the first axial flow channel 10 on the outer surface of the stator core through the inlet 11, and then flows axially toward one end of the stator. The first circumferential flow channel 21 is in fluid communication with the axial flow channel 10, and the cooling medium can alternately flow through the axial flow channel 10 and the first circumferential flow channel 21 at either end, flowing in a serpentine shape on the surface of the stator core until it flows into the N-1th axial flow channel, and then flows from the N-1th axial flow channel into the Nth axial flow channel through the opening 6 of the third flow channel rib 202, and is divided into two paths in the Nth axial flow channel to flow out to the two ends of the stator respectively, and flows into the second circumferential flow channel 22 through the opening 5 of the flow blocking rib 41, and finally flows out from the outlet 12 of the second circumferential flow channel 22 to cool the stator coil 32 at the first end and the second end.

[0066] The baffle ribs 41 can prevent the cooling medium from flowing to the second circumferential flow channel 22, so that all the cooling medium first cools the surface of the stator 3. After the cooling medium goes around the stator surface for nearly one circle, it enters the second circumferential flow channel 22. Such a flow path allows the cooling medium to first be used to cool the stator surface, and then cool the stator coil 32 through the outlet 12, which can improve the cooling effect.

[0067] The cooling system provided by at least one embodiment of the present disclosure is formed by the specific structure of the motor provided by the embodiment of the present disclosure, and the cooling system has the advantages of the motor as described above.

[0068] Embodiments of the present disclosure also provide a vehicle, which includes a motor provided by at least one embodiment of the present disclosure. The vehicle may be an electrified vehicle, such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), an extended-range electric vehicle (Range extended EV), or a fuel cell vehicle (FCEV). The vehicle may also be a hydrogen energy vehicle. Embodiments of the present invention are not limited by the specific type of the vehicle.

[0069] Based on the above, the vehicle can realize the functions of the cooling system and the motor as described above, and has the advantages as described above.

[0070] Certain features, structures or characteristics in one or more embodiments of the present application may be appropriately combined.

[0071] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0072] The above is an explanation of the present disclosure and should not be considered as a limitation thereof. Although several exemplary embodiments of the present disclosure are described, it will be readily understood by those skilled in the art that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined in the claims. It should be understood that the above is an explanation of the present disclosure and the present disclosure should not be considered to be limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the present disclosure.

Claims

1. A cooling system for a motor (1), characterized in that: The motor (1) comprises a housing (2), a stator (3) accommodated in the housing (2), and a cooling ring (4); the stator (3) has a first end and a second end along the motor axis direction; the cooling ring (4) is arranged at the first end and the second end; and the cooling system comprises: An axial flow channel (10), comprising an inlet (11) for receiving an external cooling medium, wherein the axial flow channel (10) is located between the first end and the second end and is formed by an inner wall of the housing and an outer wall of the stator; A cooling circulation channel (20) is located on the outer surface of the cooling ring (4) and is formed by the inner wall of the shell and the outer surface of the cooling ring. The cooling circulation channel (20) is fluidically connected to the axial flow channel (10) so that the cooling medium alternately flows through the axial flow channel (10) and the cooling circulation channel (20) at either end, and then flows out from the axial flow channel (10) to the outlets (12) on the cooling circulation channels (20) at both ends.

2. The cooling system according to claim 1, characterized in that: The cooling ring (4) comprises a baffle rib (41) and a baffle plate (42) extending in a circumferential direction to form a cooling circulation channel (20), wherein the cooling circulation channel (20) comprises a first circumferential flow channel (21) close to the stator end and a second circumferential flow channel (22) away from the stator end, and the baffle rib (41) has an opening portion (5).

3. The cooling system according to claim 2, characterized in that: The first circumferential flow channel (21) is fluidically connected to the axial flow channel (10) so that the cooling medium alternately flows through the axial flow channel (10) and the first circumferential flow channel (21) at either end, then flows out of the axial flow channel (10) and flows into the second circumferential flow channel (22) through the opening (5) of the baffle rib (41).

4. The cooling system according to claim 2, characterized in that: The second circumferential flow channel (22) is provided with an outlet (12) of the cooling circulation channel (20), wherein the outlet (12) is configured to apply the cooling medium to the stator coils (32) at the first end and the second end.

5. The cooling system according to claim 4, characterized in that: The outlets (12) are spray holes arranged circumferentially at intervals on the cooling ring (4).

6. The cooling system according to any one of claims 2 to 5, characterized in that: The axial flow channel (10) comprises a first flow channel rib (31) arranged on the stator (3), wherein the first flow channel rib (31) is configured to extend uninterruptedly in the axial direction so as to contact at least a portion of the baffle rib (41).

7. The cooling system according to claim 6, characterized in that: The axial flow channel (10) further comprises second flow channel ribs (201) arranged on the inner wall of the shell, grooves (203) are formed between the second flow channel ribs (201), and the first flow channel ribs (31) are engaged with the grooves (203).

8. The cooling system according to claim 7, characterized in that: The axial flow channel (10) further comprises a third flow channel rib (202) which is only arranged on the inner wall of the shell and is adjacent to the inlet (11), wherein the third flow channel rib (202) is configured to extend along the axial direction and have an opening portion (6) so that the cooling medium flows out from the axial flow channel (10) to the cooling circulation channels (20) at both ends.

9. The cooling system according to claim 8, characterized in that: The opening portion (6) of the third flow channel rib (202) is arranged at a middle position of the third flow channel rib (202).

10. The cooling system according to claim 7, characterized in that The cooling ring (4) is provided with a protrusion, and when the motor (1) is in an assembled state, the groove (203) is engaged with the protrusion.

11. The cooling system according to claim 10, characterized in that The protrusions include a first protrusion (411) provided on the baffle rib (41) and / or a second protrusion (421) provided on the baffle plate (42).

12. The cooling system according to claim 8, characterized in that The second flow channel rib (201) and the third flow channel rib (202) are interference fit with the outer surface of the stator (3).

13. The cooling system according to claim 7, characterized in that The side surface of the first flow channel rib (31) is interference fit with the side surface of the groove (203).

14. A motor, characterized in that: Comprising a cooling system as claimed in any one of claims 1 to 13.

15. A vehicle, characterized in that: The vehicle comprises the electric machine of claim 14.

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