Excitation unit cooling system of motor, electrically excited synchronous motor, driving assembly and vehicle

Abstract

The invention discloses an excitation unit cooling system of a motor, an electro-magnetic synchronous motor, a driving assembly and a vehicle. The excitation unit cooling system of the motor comprises an excitation unit, a cooling device and a cooling device, and the cooling pipeline is provided with a main cooling liquid outlet, and the main cooling liquid outlet is arranged towards the excitation unit, so that the cooling liquid in the cooling pipeline can be conveyed to the excitation unit. Therefore, the cooling liquid of the cooling pipeline directly cools the excitation unit, so that the cooling efficiency of the cooling liquid of the cooling pipeline on the excitation unit can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a cooling system for an excitation unit of a motor, an electrically excited synchronous motor, a drive assembly and a vehicle. Background Art

[0002] In the prior art, there are few ways to cool the excitation unit of an electrically excited synchronous motor. The excitation unit mainly relies on air cooling for heat dissipation. The circuit board, magnetic core, and winding inside the excitation unit are cooled by this indirect cooling method. This cooling method has the problems of slow cooling speed and low cooling efficiency. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a cooling system for an excitation unit of a motor, wherein the cooling system for the excitation unit of the motor can enable the coolant in the cooling pipe to directly cool the excitation unit, thereby improving the cooling efficiency of the coolant in the cooling pipe on the excitation unit.

[0004] The present invention further provides a cooling system for an excitation unit of a motor.

[0005] The present invention further provides an electrically excited synchronous motor.

[0006] The present invention further provides a drive assembly.

[0007] The present invention also provides a vehicle.

[0008] According to the first aspect of the present invention, the excitation unit cooling system of the motor includes: an excitation unit; a cooling pipe, wherein the cooling pipe is provided with a main coolant outlet, and the main coolant outlet is arranged toward the excitation unit to transport the coolant in the cooling pipe to the excitation unit.

[0009] Therefore, the excitation unit cooling system of the motor can enable the coolant in the cooling pipe to directly cool the excitation unit, thereby improving the cooling efficiency of the excitation unit by the coolant in the cooling pipe.

[0010] According to some embodiments of the present invention, the cooling pipe is located at an outer peripheral side of the excitation unit and is spaced apart from the excitation unit.

[0011] According to some embodiments of the present invention, there are a plurality of cooling pipes, each of which extends along the axial direction of the excitation unit, and the plurality of cooling pipes are spaced apart in the circumferential direction of the excitation unit.

[0012] According to some embodiments of the present invention, the plurality of cooling pipes are located above a central axis of the excitation unit.

[0013] According to some embodiments of the present invention, in a plane perpendicular to the axial direction of the excitation unit, an angle α between a line connecting the orthographic projections of the central axes of two adjacent cooling pipes and the orthographic projections of the central axis of the excitation unit satisfies: 30°≤α≤60°.

[0014] According to some embodiments of the present invention, the excitation unit includes: an excitation stator component; an excitation rotor component, the excitation rotor component and the excitation stator component are spaced apart from each other in the axial direction of the motor, and an air gap is formed between the excitation rotor component and the excitation stator component; wherein the main coolant outlet is directed toward at least one of the excitation stator component, the excitation rotor component and the air gap.

[0015] According to some embodiments of the present invention, there are multiple main coolant outlets, wherein:

[0016] At least one of the main coolant outlets is directed toward the excitation stator component;

[0017] At least one of the main coolant outlets is directed toward the exciter rotor component;

[0018] At least one of the primary coolant outlets is directed toward the air gap.

[0019] According to some embodiments of the present invention, the liquid outlets are arranged in rows in the cooling pipe, and the multiple rows of the main coolant outlets are spaced apart in the length direction of the cooling pipe, each row of the main coolant outlets has at least two main coolant outlets spaced apart in the circumferential direction of the cooling pipe, and the main coolant outlets in different rows are respectively oriented toward the excitation stator component, the excitation rotor component and the air gap.

[0020] According to some embodiments of the present invention, in each row of the main coolant outlets, the angle between the central axes of two adjacent main coolant outlets is β, and β satisfies: 30°≤β≤90°.

[0021] According to some embodiments of the present invention, the excitation stator component is configured with an excitation cooling branch, and the main coolant outlet faces the excitation cooling branch.

[0022] According to some embodiments of the present invention, the excitation stator component includes: an excitation stator housing; an excitation stator core, wherein the excitation stator core is disposed in the excitation stator housing; wherein the excitation cooling branch is disposed in the excitation stator housing for cooling the excitation stator core.

[0023] According to some embodiments of the present invention, the excitation stator housing is provided with a stator cooling outlet communicated with the excitation cooling branch, and the stator cooling outlet is communicated with the excitation stator core.

[0024] According to some embodiments of the present invention, the excitation stator housing includes: a stator outer ring portion; a stator disk body, wherein the stator disk body is arranged on the inner peripheral side of the stator outer ring portion, and the excitation stator core is arranged on the stator disk body and surrounded by the stator outer ring portion; wherein the excitation cooling branch has an inlet, wherein the inlet is located on the outer peripheral surface of the stator outer ring portion, and the cooling liquid sprayed from the main coolant outlet to the excitation stator component enters the excitation cooling branch through the inlet.

[0025] According to some embodiments of the present invention, the excitation cooling branch includes: a liquid inlet flow path, which is arranged on the stator disk body and extends radially along the stator disk body, and the inlet passes through the thickness direction of the stator outer ring part and is connected with the liquid inlet flow path; an annular flow path, which is arranged on the stator disk body and extends circumferentially along the stator disk body, and the annular flow path is connected with the liquid inlet flow path.

[0026] According to some embodiments of the present invention, there are multiple liquid inlet flow paths and they are arranged at intervals along the circumference of the stator disk body, there are multiple inlets and they are arranged at intervals along the circumference of the outer circumferential surface of the stator outer ring portion, the multiple inlets are connected to the multiple liquid inlet flow paths in a one-to-one correspondence, and each of the liquid inlet flow paths is connected to the annular flow path; and / or there are multiple annular flow paths and they are arranged at intervals along the radial direction of the disk body, and each of the annular flow paths is connected to the liquid inlet flow path.

[0027] According to some embodiments of the present invention, the excitation cooling branch further includes: a liquid guide groove, which is arranged on the outer peripheral surface of the stator outer ring portion and extends along the circumference of the stator outer ring portion, and the plurality of inlets are arranged on the inner wall of the liquid guide groove.

[0028] According to some embodiments of the present invention, the inlet is opened on the inner wall of the liquid guiding groove on a side adjacent to the stator disk.

[0029] According to some embodiments of the present invention, the side of the annular flow path facing the excitation stator core is open to form a first stator cooling outlet; and / or the side of the liquid inlet flow path facing the excitation stator core is open to form a second stator cooling outlet.

[0030] According to some embodiments of the present invention, the excitation stator housing has a center line perpendicular to its axial direction and extending in the up-down direction, the liquid inlet flow paths are multiple and symmetrically arranged about the center line, and the inlet is multiple and symmetrically arranged about the center line.

[0031] According to some embodiments of the present invention, the liquid guide groove includes: a first sub-groove and a second sub-groove, the first sub-groove and the second sub-groove are spaced apart in the circumferential direction of the stator outer ring portion and are symmetrical about the center line, the multiple inlets located on one side of the center line are arranged on the inner wall of the first sub-groove, and the multiple inlets located on the other side of the center line are arranged on the inner wall of the second sub-groove.

[0032] According to some embodiments of the present invention, the shape of the annular flow path is one of a circular ring, an elliptical ring and a polygonal ring.

[0033] According to some embodiments of the present invention, the excitation cooling branch further includes: a liquid outlet flow path, which is arranged on the stator disk body and extends radially along the stator disk body, and the bottom of the outer peripheral surface of the stator outer ring portion is provided with an outlet connected to the liquid outlet flow path.

[0034] According to some embodiments of the present invention, the excitation stator housing has a center line perpendicular to its axial direction and extending in the up-down direction, the liquid outlet flow paths are multiple and symmetrically arranged about the center line, the outlets are multiple and symmetrically arranged about the center line, and the multiple outlets are connected to the multiple liquid outlet flow paths in a one-to-one correspondence.

[0035] According to some embodiments of the present invention, the excitation cooling branch is in a spiral shape.

[0036] According to some embodiments of the present invention, the excitation stator component further includes: an excitation stator winding, wherein the excitation stator winding is disposed on the excitation stator core, and a first filling member is filled between the excitation stator winding and the excitation stator core.

[0037] According to some embodiments of the present invention, the excitation rotor component includes: an excitation rotor housing; an excitation rotor core, wherein the excitation rotor core is arranged in the excitation rotor housing; an excitation rotor winding, wherein the excitation rotor winding is arranged in the excitation rotor core, and a second filling piece is arranged between the excitation rotor winding and the excitation rotor core.

[0038] According to some embodiments of the present invention, the excitation rotor component also includes a circuit board; the excitation rotor housing includes: a rotor outer ring portion; a rotor disk body, the rotor disk body surrounding the outer peripheral side of the inner ring portion, and the excitation rotor core is arranged on the rotor disk body; wherein the portion of the rotor outer ring portion extending beyond the rotor disk body toward the excitation rotor component surrounds a first accommodating groove, the portion of the rotor outer ring portion extending beyond the rotor disk body away from the excitation rotor component surrounds a second accommodating groove, the excitation rotor core is arranged in the first accommodating groove, and the circuit board is arranged in the second accommodating groove.

[0039] According to some embodiments of the present invention, the first receiving groove and / or the second receiving groove is filled with a third filling member.

[0040] An electrically excited synchronous motor according to an embodiment of the second aspect of the present invention includes: the above-mentioned motor excitation unit cooling system.

[0041] The drive assembly according to the third aspect of the present invention includes: the above-mentioned electrically excited synchronous motor.

[0042] A vehicle according to an embodiment of the fourth aspect of the present invention comprises: the above-mentioned electrically excited synchronous motor or the above-mentioned drive assembly.

[0043] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0045] Figure 1 is a schematic structural diagram of an excitation unit cooling system of a motor according to an embodiment of the present invention;

[0046] Figure 2 is a schematic structural diagram of a cooling pipeline according to an embodiment of the present invention;

[0047] Figure 3 is a schematic structural diagram of an excitation stator housing according to an embodiment of the present invention;

[0048] Figure 4 is a schematic structural diagram of a stator cooling outlet according to an embodiment of the present invention;

[0049] Figure 5 is a schematic structural diagram of an excitation stator housing including a liquid guide groove according to an embodiment of the present invention;

[0050] Figure 6 is an exploded diagram of an excitation unit cooling system of a motor according to an embodiment of the present invention;

[0051] Figure 7 is a schematic structural diagram of an excitation rotor housing including a circuit board according to an embodiment of the present invention;

[0052] Figure 8 is a schematic structural diagram of an excitation rotor housing according to an embodiment of the present invention.

[0053] Reference numerals:

[0054] 100. Cooling system of the excitation unit of the motor;

[0055] 10. Excitation unit; 11. Excitation stator component; 111. Excitation stator housing; 112. Excitation stator core; 113. Stator outer ring; 114. Stator disc; 115. Excitation stator winding;

[0056] 12. excitation rotor component; 13. air gap; 14. excitation cooling branch; 141. liquid inlet flow path; 142. annular flow path; 143. liquid guide groove; 144. first sub-groove; 145. second sub-groove; 146. liquid outlet flow path; 15. excitation rotor winding; 16. excitation rotor housing; 161. rotor outer ring; 162. rotor disk; 163. first containing groove; 164. second containing groove;

[0057] 17. Excitation rotor core; 18. Circuit board;

[0058] 20. Stator cooling outlet; 21. First stator cooling outlet; 22. Second stator cooling outlet;

[0059] 23. Import;

[0060] 30. Cooling pipeline; 31. Main coolant outlet;

[0061] 40. Export. DETAILED DESCRIPTION

[0062] Embodiments of the present invention are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0063] Reference below Figure 1-Figure 8 An excitation unit cooling system 100 for a motor according to an embodiment of the present invention is described.

[0064] like Figure 1 As shown, the excitation unit cooling system 100 of the motor according to the first embodiment of the present invention comprises: an excitation unit 10 and a cooling pipe 30, wherein the cooling pipe 30 is provided with a main coolant outlet 31, and the main coolant outlet 31 is arranged toward the excitation unit 10, so that the coolant in the cooling pipe 30 can be transported to the excitation unit 10. The coolant can be oil.

[0065] Specifically, the excitation unit cooling system of a traditional motor mainly relies on air cooling to dissipate heat from the excitation unit housing. This cooling method cannot directly cool the circuit board, magnetic core, and winding inside the excitation unit, which results in a low cooling efficiency. Due to the low cooling efficiency, the motor may be damaged by overheating, thus affecting the service life of the motor.

[0066] Therefore, the excitation unit cooling system 100 of the motor is mainly composed of an excitation unit 10 and a cooling pipe 30. The coolant in the cooling pipe 30 can flow out through the main coolant outlet 31. Moreover, the main coolant outlet 31 is arranged toward the excitation unit 10, so that the coolant in the cooling pipe 30 can flow to the excitation unit 10. In this way, the coolant in the cooling pipe 30 can directly cool the excitation unit 10, thereby improving the cooling efficiency of the coolant in the cooling pipe 30 on the excitation unit 10.

[0067] Therefore, the excitation unit cooling system 100 of the motor can enable the coolant in the cooling pipe 30 to directly cool the excitation unit 10 , thereby improving the cooling efficiency of the excitation unit 10 by the coolant in the cooling pipe 30 .

[0068] According to some embodiments of the present invention, Figure 1 As shown, the cooling pipe 30 is located on the outer peripheral side of the excitation unit 10 , and the cooling pipe 30 is spaced apart from the excitation unit 10 .

[0069] The cooling pipe 30 is arranged around the outer circumference of the excitation unit 10, and can cool the excitation unit 10 in all directions, thereby preventing the local temperature of the excitation unit 10 from being too high. In addition, during operation, a part of the excitation unit 10 rotates, and the cooling pipe 30 is spaced apart from the excitation unit 10, thereby preventing interference between the cooling pipe 30 and the excitation unit 10.

[0070] According to some embodiments of the present invention, Figure 1 As shown, there are a plurality of cooling pipes 30 , each of which extends along the axial direction of the excitation unit 10 , and the plurality of cooling pipes 30 are arranged at intervals in the circumferential direction of the excitation unit 10 .

[0071] Among them, the excitation unit 10 is sleeved on the rotating shaft of the motor, and a rotor is also arranged on the rotating shaft. Since the cooling pipe 30 extends along the axial direction of the excitation unit 10, the coolant in the cooling pipe 30 can not only flow to the excitation unit 10, but also flow to the rotor, stator and other electronic components on the rotating shaft. In this way, the coolant in the cooling pipe 30 can cool the electronic components on the rotating shaft of the motor that need heat dissipation, thereby improving the utilization efficiency of the cooling pipe 30.

[0072] In addition, multiple cooling pipes 30 are arranged at intervals in the circumferential direction of the excitation unit 10, which can increase the cooling speed of the excitation unit 10 and realize cooling of the excitation unit 10 in different directions, so that the temperature of the excitation unit 10 in all directions can be more uniform.

[0073] According to some embodiments of the present invention, Figure 1As shown, a plurality of cooling ducts 30 are located above the central axis of the excitation unit 10 .

[0074] Among them, multiple cooling pipes 30 are located above the central axis of the excitation unit 10. Due to the effects of fluid pressure and gravity, the coolant in the cooling pipes 30 can flow quickly to the excitation unit 10, thereby ensuring that the excitation unit 10 has sufficient coolant to achieve the purpose of cooling.

[0075] According to some embodiments of the present invention, Figure 1 As shown, in a plane perpendicular to the axial direction of the excitation unit 10 , the angle α between the orthographic projections of the central axes of two adjacent cooling pipes 30 and the line connecting the orthographic projections of the central axis of the excitation unit 10 satisfies: 30°≤α≤60°.

[0076] The angle between the orthographic projection of the central axis of two adjacent cooling pipes 30 and the line connecting the orthographic projection of the central axis of the excitation unit 10 is in the range of 30° to 60°, so that the coolant of the two adjacent cooling pipes 30 can be evenly sprayed onto the excitation unit 10, thereby achieving uniform heat dissipation of the excitation unit 10. For example, α can be 30°, 45°, and 60°.

[0077] According to a specific embodiment of the present invention, Figure 6 As shown, the excitation unit 10 includes: an excitation stator component 11 and an excitation rotor component 12, the excitation rotor component 12 and the excitation stator component 11 are spaced apart in the axial direction of the motor, an air gap 13 is formed between the excitation rotor component 12 and the excitation stator component 11, wherein the main coolant outlet 31 is oriented toward at least one of the excitation stator component 11, the excitation rotor component 12 and the air gap 13.

[0078] Specifically, the excitation rotor component 12 is in transmission connection with the rotating shaft of the motor, and the excitation rotor component 12 rotates synchronously with the rotating shaft, and the excitation stator component 11 is loosely sleeved on the rotating shaft of the motor, so that the excitation stator component 11 is not in transmission connection with the rotating shaft of the motor, and the rotating shaft of the motor only provides a certain support for the excitation stator component 11. When the excitation rotor component 12 rotates with the rotating shaft, since the excitation rotor component 12 and the excitation stator component 11 are spaced apart in the axial direction of the motor, interference between the excitation rotor component 12 and the excitation stator component 11 can be avoided.

[0079] Furthermore, an air gap 13 is formed between the excitation rotor component 12 and the excitation stator component 11. When an alternating current is passed through one side of the excitation stator component 11 to generate an alternating magnetic field, the energy is transferred to the excitation rotor component 12 through the air gap 13. In this way, an alternating current is induced in the excitation rotor component 12, thereby realizing wireless energy transmission.

[0080] In addition, the main coolant outlet 31 is oriented toward at least one of the excitation stator component 11, the excitation rotor component 12, and the air gap 13. That is, the main coolant outlet 31 may be oriented toward one of the excitation stator component 11, the excitation rotor component 12, and the air gap 13, or may be oriented toward two of the excitation stator component 11, the excitation rotor component 12, and the air gap 13, or the excitation stator component 11, the excitation rotor component 12, and the air gap 13 may all be arranged corresponding to the main coolant outlet 31. In this way, the coolant may directly cool the excitation stator component 11, or may cool the excitation rotor component 12, or the coolant may directly cool the excitation stator component 11, the excitation rotor component 12, and the air gap 13.

[0081] According to a specific embodiment of the present invention, Figure 1 As shown, there are multiple main coolant outlets 31 , wherein at least one main coolant outlet 31 faces the excitation stator component 11 , at least one main coolant outlet 31 faces the excitation rotor component 12 , and at least one main coolant outlet 31 faces the air gap 13 .

[0082] Specifically, the multiple main coolant outlets 31 are directed toward the excitation stator component 11, and the multiple main coolant outlets 31 can cool the excitation stator component 11 at the same time, thereby further improving the heat dissipation rate of the excitation stator component 11. Similarly, the multiple main coolant outlets 31 are directed toward the excitation rotor component 12, which can further improve the heat dissipation rate of the excitation rotor component 12, and the multiple main coolant outlets 31 are arranged toward the air gap 13, which can further improve the heat dissipation rate at the air gap 13.

[0083] According to some embodiments of the present invention, Figure 1 As shown, a plurality of main coolant outlets 31 are arranged in rows in the cooling pipe 30, and the plurality of rows of main coolant outlets 31 are spaced apart in the length direction of the cooling pipe 30, and each row of main coolant outlets 31 has at least two main coolant outlets 31 spaced apart in the circumferential direction of the cooling pipe 30, and the main coolant outlets 31 in different rows are respectively oriented toward the excitation stator component 11, the excitation rotor component 12 and the air gap 13.

[0084] Among them, the cooling pipe 30 can be set to three, and correspondingly, the multiple main coolant outlets 31 on the cooling pipe 30 are also formed in three rows, and the main coolant outlets 31 in each row are spaced apart in the length direction of the cooling pipe 30, so that it is convenient to cool the corresponding excitation stator component 11, excitation rotor component 12 and air gap 13 below the main coolant outlet 31.

[0085] Furthermore, each row of cooling pipes 30 has at least two main coolant outlets 31 spaced apart in the circumferential direction, so that the corresponding excitation stator component 11, excitation rotor component 12 and air gap 13 below the main coolant outlets 31 can be evenly cooled and dissipated, and the coolant can be sprayed to different positions of the corresponding excitation stator component 11, excitation rotor component 12 and air gap 13, thereby ensuring that the excitation stator component 11, excitation rotor component 12 and air gap 13 are at a suitable operating temperature.

[0086] According to a specific embodiment of the present invention, Figure 2 As shown, in each row of main coolant outlets 31 , the angle between the central axes of two adjacent main coolant outlets 31 is β, and β satisfies: 30°≤β≤90°.

[0087] Specifically, the angle between the central axes of two adjacent main coolant outlets 31 is in the range of 30° to 90°, so that the angle between the central axes of the two adjacent main coolant outlets 31 can be adjusted according to the flow direction of the coolant of the two adjacent main coolant outlets 31, thereby ensuring that the excitation unit 10 can be cooled by the coolant in all directions. For example, β can be 30°, 60° and 90°.

[0088] According to some embodiments of the present invention, Figure 1 and Figure 3 As shown, the field stator component 11 is configured with a field cooling branch 14 , and the main coolant outlet 31 faces the field cooling branch 14 .

[0089] Among them, the main coolant outlet 31 is toward the excitation cooling branch 14, and the coolant of the main coolant outlet 31 can flow into the excitation cooling branch 14, so that the excitation cooling branch 14 can directly cool and dissipate heat for the excitation stator component 11, thereby reducing the temperature of the excitation stator component 11.

[0090] According to some embodiments of the present invention, Figure 6 and Figure 7 As shown, the excitation stator component 11 includes: an excitation stator housing 111 and an excitation stator core 112 . The excitation stator core 112 is disposed in the excitation stator housing 111 , wherein the excitation cooling branch 14 is disposed in the excitation stator housing 111 for cooling the excitation stator core 112 .

[0091] Among them, the excitation stator housing 111 can provide an installation space for the excitation stator core 112. Since the excitation stator core 112 generates heat during operation, the excitation stator core 112 is in direct contact with the excitation stator housing 111. Therefore, an excitation cooling branch 14 is arranged on the excitation stator housing 111. In this way, the excitation cooling branch 14 can directly cool the excitation stator core 112.

[0092] According to some embodiments of the present invention, Figure 4 As shown, the excitation stator housing 111 is provided with a stator cooling outlet 20 communicating with the excitation cooling branch 14 , and the stator cooling outlet 20 is communicated with the excitation stator core 112 .

[0093] The coolant in the excitation cooling branch 14 can flow out to the excitation stator core 112 through the stator cooling outlet 20 , so that the excitation stator core 112 can be in direct contact with the coolant, thereby achieving direct cooling of the excitation stator core 112 .

[0094] According to a specific embodiment of the present invention, Figure 3-Figure 5 As shown, the excitation stator housing 111 includes: a stator outer ring portion 113 and a stator disk body 114, the stator disk body 114 is arranged on the inner peripheral side of the stator outer ring portion 113, the excitation stator core 112 is arranged on the stator disk body 114, and the excitation stator core 112 is surrounded by the stator outer ring portion 113, wherein the excitation cooling branch 14 has an inlet 23, and the inlet 23 is located on the outer peripheral surface of the stator outer ring portion 113, and the coolant sprayed from the main coolant outlet 31 to the excitation stator component 11 enters the excitation cooling branch 14 through the inlet 23.

[0095] Specifically, the excitation stator housing 111 is mainly composed of a stator outer ring portion 113 and a stator disk body 114. The stator disk body 114 is arranged on the inner circumference of the stator outer ring portion 113, which can protect the stator disk body 114. The excitation stator core 112 is in contact with the stator disk body 114, and the stator outer ring portion 113 can also protect the excitation stator core 112.

[0096] In addition, an inlet 23 is provided on the outer peripheral surface of the stator outer ring portion 113, and the coolant of the main coolant outlet 31 is sprayed toward the inlet 23. The setting of the inlet 23 can facilitate the coolant to enter the excitation cooling branch 14, so that the excitation cooling branch 14 can be filled with coolant.

[0097] According to some embodiments of the present invention, Figure 3 As shown, the excitation cooling branch 14 includes: a liquid inlet flow path 141 and an annular flow path 142. The liquid inlet flow path 141 is arranged on the stator disk body 114, and the liquid inlet flow path 141 extends along the radial direction of the stator disk body 114. The inlet 23 passes through the thickness direction of the stator outer ring portion 113, and the inlet 23 is connected with the liquid inlet flow path 141. The annular flow path 142 is arranged on the stator disk body 114, and the annular flow path 142 extends along the circumferential direction of the stator disk body 114, and the annular flow path 142 is connected with the liquid inlet flow path 141.

[0098] Among them, the stator disc body 114 is provided with a liquid inlet flow path 141. When the coolant of the main coolant outlet 31 is sprayed toward the inlet 23, the coolant enters the liquid inlet flow path 141 from the inlet 23. Since the liquid inlet flow path 141 extends radially along the stator disc body 114, the coolant can flow from the outside of the stator disc body 114 to the inside of the stator disc body 114. Among them, an annular flow path 142 is provided between the outside of the stator disc body 114 and the inside of the stator disc body 114. The coolant can flow to the annular flow path 142 through the liquid inlet flow path 141, so that the coolant can fill the entire annular flow path 142 along the circumferential direction.

[0099] According to some embodiments of the present invention, Figure 3 As shown, there are multiple liquid inlet flow paths 141, and the liquid inlet flow paths 141 are arranged at intervals along the circumference of the stator disk body 114, there are multiple inlets 23, and the inlets 23 are arranged at intervals along the circumference of the outer circumferential surface of the stator outer ring portion 113, the multiple inlets 23 are connected to the multiple liquid inlet flow paths 141 in a one-to-one correspondence, each liquid inlet flow path 141 is connected to the annular flow path 142, there are multiple annular flow paths 142, and the annular flow paths 142 are arranged at intervals along the radial direction of the disk body, and each annular flow path 142 is connected to the liquid inlet flow path 141.

[0100] The plurality of liquid inlet channels 141 can speed up the speed of the coolant entering the excitation cooling branch 14, and can also increase the flow rate of the coolant entering the excitation cooling branch 14. The liquid inlet channels 141 are arranged at intervals along the circumference of the stator disc 114, so that the coolant can enter the stator disc 114 from different directions, thereby cooling different parts of the stator disc 114.

[0101] Furthermore, since there are multiple inlet flow paths 141, correspondingly, there are also multiple inlet ports 23, and each inlet flow path 141 is connected to each inlet port 23 in a one-to-one correspondence. Each inlet flow path 141 is connected to the annular flow path 142, which can speed up the speed at which the annular flow path 142 is filled with coolant. Moreover, there are multiple annular flow paths 142, and the multiple annular flow paths 142 are evenly spaced along the radial direction of the stator disk body 114, so that the coolant can be evenly distributed on the entire stator disk body 114, so that the excitation stator core 112 in contact with the stator disk body 114 can be evenly cooled.

[0102] According to some embodiments of the present invention, Figure 3 As shown, the excitation cooling branch 14 further includes: a liquid guide groove 143, which is arranged on the outer peripheral surface of the stator outer ring portion 113, and the liquid guide groove 143 extends along the circumferential direction of the stator outer ring portion 113, and a plurality of inlets 23 are arranged on the inner wall of the liquid guide groove 143.

[0103] Among them, the liquid guiding groove 143 is arranged on the outer peripheral surface of the stator outer ring part 113, so that the liquid guiding groove 143 can not only gather the coolant, but also prevent the coolant from splashing, and can also guide the coolant, so that the coolant can accurately enter the liquid inlet path 141 through multiple inlets 23.

[0104] According to some embodiments of the present invention, Figure 3 As shown, the inlet 23 is opened on the inner wall of the liquid guiding groove 143 on one side adjacent to the stator disc 114 .

[0105] The inlet 23 is disposed close to the inner wall of one side of the stator disc body 114 , so as to be connected with the liquid inlet flow path 141 , thereby facilitating the coolant of the inlet 23 to enter from the liquid inlet flow path 141 .

[0106] According to a specific embodiment of the present invention, Figure 4 As shown, the side of the annular flow path 142 facing the excitation stator core 112 is open to form a first stator cooling outlet 20 , and the side of the liquid inlet flow path 141 facing the excitation stator core 112 is open to form a second stator cooling outlet 22 .

[0107] Specifically, the side of the annular flow path 142 facing the excitation stator core 112 is open to form a first stator cooling outlet 21, so that the cooling liquid in the annular flow path 142 can flow out from the first stator cooling outlet 21, thereby cooling the excitation stator core 112 in the circumferential direction. The liquid inlet flow path 141 extends radially, and the cooling liquid in the liquid inlet flow path 141 can flow out from the second stator cooling outlet 22, thereby cooling the excitation stator core 112 in the radial direction.

[0108] According to some embodiments of the present invention, Figure 3 As shown, the excitation stator housing 111 has a center line perpendicular to its axial direction and extending in the up-down direction, there are multiple liquid inlet flow paths 141, and the liquid inlet flow paths 141 are symmetrically arranged about the center line, and there are multiple inlets 23, and they are symmetrically arranged about the center line.

[0109] Among them, multiple liquid inlet flow paths 141 are symmetrically arranged about the center line, so that the coolant can be evenly distributed in the liquid inlet flow paths 141. Since the multiple liquid inlet flow paths 141 are arranged one-to-one with the multiple inlets 23, accordingly, the multiple inlets 23 are symmetrically arranged about the center line, so that the coolant can enter evenly.

[0110] According to some embodiments of the present invention, Figure 3As shown, the liquid guide groove 143 includes: a first sub-groove 144 and a second sub-groove 145, the first sub-groove 144 and the second sub-groove 145 are spaced apart in the circumferential direction of the stator outer ring portion 113, and the first sub-groove 144 and the second sub-groove 145 are symmetrical about the center line, and the multiple inlets 23 located on one side of the center line are arranged on the inner wall of the first sub-groove 144, and the multiple inlets 23 located on the other side of the center line are arranged on the inner wall of the second sub-groove 145.

[0111] Among them, the first sub-groove 144 and the second sub-groove 145 are spaced apart in the circumferential direction of the stator outer ring portion 113, which can facilitate the collection of more coolant, and the first sub-groove 144 and the second sub-groove 145 are symmetrical about the center line, which can evenly collect the coolant and prevent the coolant from splashing.

[0112] In addition, the inner wall of the first sub-groove 144 is provided with a plurality of inlets 23 , and the inner wall of the second sub-groove 145 is also provided with a plurality of inlets 23 , so that the coolant can enter from different directions and the speed at which the coolant enters the liquid inlet path 141 can be accelerated.

[0113] According to a specific embodiment of the present invention, the shape of the annular flow path 142 is one of a circular ring, an elliptical ring and a polygonal ring.

[0114] Specifically, the shape of the annular flow path 142 can be set to a circular ring with different diameters, or to an elliptical ring, or to a polygonal ring, wherein the polygonal ring can be a quadrilateral ring, a pentagonal ring, or a hexagonal ring, etc. The shape of the annular flow path 142 can be set according to the size of the excitation rotor housing 16.

[0115] Furthermore, the shape of the annular flow path 142 can also be a combination of two or more of a circular ring, an elliptical ring and a polygonal ring, so that the coolant in the annular flow path 142 can be cooled and dissipated through flow paths of different shapes. The annular flow paths 142 of different shapes have different distances, and the annular flow path 142 with a longer distance can further improve the cooling efficiency of the excitation rotor core 17.

[0116] According to some embodiments of the present invention, Figure 3 and Figure 4 As shown, the excitation cooling branch 14 also includes: a liquid outlet flow path 146, which is arranged on the stator disk body 114 and extends radially along the stator disk body 114. The bottom of the outer peripheral surface of the stator outer ring part 113 is provided with an outlet 40 connected to the liquid outlet flow path 146.

[0117] Among them, the liquid outlet oil circuit is arranged below the stator disk body 114, which can facilitate the coolant to flow out from the bottom of the stator disk body 114, and the coolant in the liquid outlet oil circuit flows out radially through the outlet 40, so that the outflow speed of the coolant can be accelerated, and the circulation of the coolant can also be accelerated, thereby improving the cooling efficiency.

[0118] According to some embodiments of the present invention, Figure 4 As shown, the excitation stator housing 111 has a center line perpendicular to its axial direction and extending in the up-down direction, there are multiple liquid outlet flow paths 146, and the liquid outlet flow paths 146 are symmetrically arranged about the center line, there are multiple outlets 40, and the outlets 40 are symmetrically arranged about the center line, and the multiple outlets 40 are connected to the multiple liquid outlet flow paths 146 in a one-to-one correspondence.

[0119] The provision of multiple liquid outlet channels 146 can further speed up the outflow speed of the coolant, and the liquid outlet channels 146 are symmetrically arranged about the center line, so that the liquid outlet channels 146 can flow out evenly through the outlet 40 .

[0120] According to some embodiments of the present invention, the excitation cooling branch 14 is in a spiral shape.

[0121] Among them, the excitation cooling branch 14 can be set to a spiral shape, so that the excitation cooling branch 14 can form an overall circulation flow path, and the area of ​​the excitation cooling branch 14 can be increased, thereby further improving the cooling efficiency of the excitation cooling branch 14 on the excitation stator core 112.

[0122] According to some embodiments of the present invention, Figure 7 As shown, the excitation stator component 11 further includes: an excitation stator winding 115 , the excitation stator winding 115 is arranged on the excitation stator core 112 , and a first filling member is filled between the stator winding and the excitation stator core 112 .

[0123] Among them, the first filling member can be epoxy resin, which has a high heat transfer efficiency. The epoxy resin is filled between the excitation stator winding 115 and the excitation stator core 112, which can increase the heat dissipation speed of the excitation stator winding 115 and facilitate the transfer of heat from the excitation stator winding 115 to the excitation stator core 112, so that the heat can be taken away by the coolant, and the stiffness of the excitation stator component 11 can be further improved.

[0124] According to some embodiments of the present invention, Figure 6 As shown, the excitation rotor component 12 includes: an excitation rotor housing 16, an excitation rotor winding 15 and an excitation rotor core 17, the excitation rotor core 17 is arranged on the excitation rotor housing 16, the excitation rotor winding 15 is arranged on the excitation rotor core 17, and a second filling piece is arranged between the excitation rotor winding 15 and the excitation rotor core 17.

[0125] Among them, the excitation rotor housing 16 provides an installation space for the excitation rotor core 17, and the second filling member can be epoxy resin, which is filled between the excitation rotor winding 15 and the excitation rotor core 17. This can increase the heat dissipation speed of the excitation rotor winding 15, and facilitate the heat transfer of the excitation rotor winding 15 to the excitation rotor core 17, so that the heat can be taken away by the coolant, and the stiffness of the excitation rotor component 12 can be further improved.

[0126] According to some embodiments of the present invention, Figure 6 and Figure 7 As shown, the excitation rotor component 12 also includes a circuit board 18, and the excitation rotor housing 16 includes: a rotor outer ring portion 161 and a rotor disk body 162, the rotor disk body 162 surrounds the outer peripheral side of the inner ring portion, and the excitation rotor core 17 is arranged on the rotor disk body 162, wherein the portion of the rotor outer ring portion 161 that extends beyond the rotor disk body 162 toward the excitation rotor component 12 surrounds a first accommodating groove 163, and the portion of the rotor outer ring portion 161 that extends beyond the rotor disk body 162 away from the excitation rotor component 12 surrounds a second accommodating groove 164, the excitation rotor core 17 is arranged in the first accommodating groove 163, and the circuit board 18 is arranged in the second accommodating groove 164.

[0127] Among them, a part of the outer ring portion extending toward the excitation stator component 11 on one side is formed with a first accommodating groove 163, and the first accommodating groove 163 can provide an installation space for the excitation rotor core 17, and a part of the outer ring portion extending away from the excitation stator component 11 on the other side is formed with a second accommodating groove 164, and the second accommodating groove 164 can provide an installation space for the circuit board 18.

[0128] In addition, the circuit board 18 is integrated on the excitation rotor housing 16 and fixed by fixing bolts passing through the through holes, so that the heat generated by the electrical components on the circuit board 18 during operation can be dissipated.

[0129] According to some embodiments of the present invention, the first accommodating groove 163 and / or the second accommodating groove 164 is filled with a third filling member.

[0130] Among them, the third filling member can be an epoxy resin with high heat transfer efficiency. The epoxy resin is filled in the first receiving groove 163, which can increase the heat dissipation rate of the excitation rotor core 17 in the first receiving groove 163, or the epoxy resin can be filled in the second receiving groove 164, which can increase the heat dissipation rate of the circuit board 18 in the second receiving groove 164. The first receiving groove 163 and the second receiving groove 164 can also be filled with epoxy resin. In this way, the heat dissipation rate of the excitation rotor component 12 can be further improved, and the rigidity of the excitation rotor component 12 can also be increased.

[0131] The electrically excited synchronous motor according to the second embodiment of the present invention comprises: the excitation unit cooling system 100 of the motor of the above embodiment. The cooling pipe 30 can be fixed on the inner peripheral wall of the motor housing, and the cooling pipe 30 can also spray coolant toward the stator of the motor to cool the stator.

[0132] Among them, the excitation rotor housing 16 and the excitation stator housing 111 can both be designed to be H-shaped. This housing is made of magnetically isolating aluminum material, which can avoid electromagnetic interference caused by the motor. It can also be made of other non-magnetic materials, such as iron. Moreover, the housing has a large contact area with the outside world, which can facilitate heat dissipation.

[0133] A vehicle according to an embodiment of the third aspect of the present invention comprises: an electrically excited synchronous motor according to the above embodiment.

[0134] The drive assembly according to the third aspect of the present invention includes: the electrically excited synchronous motor of the above embodiment.

[0135] A vehicle according to an embodiment of the fourth aspect of the present invention comprises: the electrically excited synchronous motor of the above embodiment or the drive assembly of the above embodiment.

[0136] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0137] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cooling system for an excitation unit of a motor, characterized in that: include: Excitation unit; A cooling pipeline is provided with a main coolant outlet, and the main coolant outlet is arranged toward the excitation unit to transport the coolant in the cooling pipeline to the excitation unit.

2. The excitation unit cooling system of the motor according to claim 1, characterized in that: The cooling pipe is located at an outer peripheral side of the excitation unit and is spaced apart from the excitation unit.

3. The excitation unit cooling system of the motor according to claim 2, characterized in that: There are a plurality of cooling pipes, each of which extends along the axial direction of the excitation unit, and the plurality of cooling pipes are arranged at intervals in the circumferential direction of the excitation unit.

4. The excitation unit cooling system of the motor according to claim 3, characterized in that: The plurality of cooling pipes are located above the central axis of the excitation unit.

5. The excitation unit cooling system of a motor according to claim 3, characterized in that: In a plane perpendicular to the axial direction of the excitation unit, an angle α between the orthographic projections of the central axes of two adjacent cooling pipes and a line connecting the orthographic projections of the central axis of the excitation unit satisfies: 30°≤α≤60°.

6. The excitation unit cooling system of a motor according to claim 1, characterized in that: The excitation unit comprises: Excitation stator components; an excitation rotor component, wherein the excitation rotor component and the excitation stator component are spaced apart in the axial direction of the motor, and an air gap is formed between the excitation rotor component and the excitation stator component; Wherein, the main coolant outlet is toward at least one of the excitation stator component, the excitation rotor component and the air gap.

7. The excitation unit cooling system of a motor according to claim 6, characterized in that: There are multiple main coolant outlets, among which: At least one of the main coolant outlets is directed toward the excitation stator component; At least one of the main coolant outlets is directed toward the exciter rotor component; At least one of the primary coolant outlets is directed toward the air gap.

8. The excitation unit cooling system of a motor according to claim 7, characterized in that: A plurality of the main coolant outlets are arranged in rows in the cooling pipe, and the plurality of rows of the main coolant outlets are spaced apart in the length direction of the cooling pipe, and each row of the main coolant outlets has at least two main coolant outlets spaced apart in the circumferential direction of the cooling pipe, and the main coolant outlets in different rows are respectively oriented toward the excitation stator component, the excitation rotor component and the air gap.

9. The excitation unit cooling system of a motor according to claim 8, characterized in that: In each row of the main coolant outlets, the angle between the central axes of two adjacent main coolant outlets is β, and β satisfies: 30°≤β≤90°.

10. The excitation unit cooling system of a motor according to claim 6, characterized in that: The excitation stator component is configured with an excitation cooling branch, and the main coolant outlet faces the excitation cooling branch.

11. The excitation unit cooling system of a motor according to claim 10, characterized in that: The excitation stator component comprises: Excitation stator housing; An excitation stator core, wherein the excitation stator core is arranged on the excitation stator housing; Wherein, the excitation cooling branch is arranged on the excitation stator housing for cooling the excitation stator core.

12. The excitation unit cooling system of a motor according to claim 11, characterized in that: The excitation stator housing is provided with a stator cooling outlet communicated with the excitation cooling branch, and the stator cooling outlet is communicated with the excitation stator core.

13. The excitation unit cooling system of a motor according to claim 11, characterized in that: The excitation stator housing comprises: stator outer ring; A stator disc body, wherein the stator disc body is arranged on the inner circumference side of the stator outer ring portion, and the excitation stator core is arranged on the stator disc body and surrounded by the stator outer ring portion; The excitation cooling branch has an inlet, which is located on the outer peripheral surface of the stator outer ring portion, and the coolant sprayed from the main coolant outlet to the excitation stator component enters the excitation cooling branch through the inlet.

14. The excitation unit cooling system of a motor according to claim 13, characterized in that: The excitation cooling branch comprises: A liquid inlet flow path, the liquid inlet flow path is provided on the stator disc body and extends in the radial direction of the stator disc body, the inlet penetrates the thickness direction of the stator outer ring part and communicates with the liquid inlet flow path; An annular flow path is provided on the stator disc body and extends along the circumference of the stator disc body, and the annular flow path is communicated with the liquid inlet flow path.

15. The excitation unit cooling system of a motor according to claim 13, characterized in that: The plurality of liquid inlet flow paths are arranged at intervals along the circumference of the stator disc body, the plurality of inlets are arranged at intervals along the circumference of the outer circumference of the stator outer ring portion, the plurality of inlets are connected to the plurality of liquid inlet flow paths in a one-to-one correspondence, and each of the liquid inlet flow paths is connected to the annular flow path; and / or There are a plurality of annular flow paths which are spaced apart along the radial direction of the disk body, and each of the annular flow paths is communicated with the liquid inlet flow path.

16. The excitation unit cooling system of a motor according to claim 13, characterized in that: The excitation cooling branch also includes: The liquid-conducting groove is arranged on the outer peripheral surface of the stator outer ring portion and extends along the circumferential direction of the stator outer ring portion, and the plurality of inlets are arranged on the inner wall of the liquid-conducting groove.

17. The excitation unit cooling system of a motor according to claim 16, characterized in that: The inlet is opened on the inner side wall of the liquid guiding groove on one side adjacent to the stator disc body.

18. The excitation unit cooling system of a motor according to claim 16, characterized in that: A side of the annular flow path facing the excitation stator core is open to form a first stator cooling outlet; and / or The side of the liquid inlet flow path facing the excitation stator core is open to form a second stator cooling outlet.

19. The excitation unit cooling system of a motor according to claim 18, characterized in that: The excitation stator housing has a center line perpendicular to its axial direction and extending in the up-down direction. The liquid inlet flow paths are multiple and symmetrically arranged about the center line. The inlets are multiple and symmetrically arranged about the center line.

20. The excitation unit cooling system of a motor according to claim 19, characterized in that: The liquid guiding groove comprises: A first sub-slot and a second sub-slot, wherein the first sub-slot and the second sub-slot are spaced apart in the circumferential direction of the stator outer ring portion and are symmetrical about the center line, a plurality of the inlets located on one side of the center line are arranged on the inner wall of the first sub-slot, and a plurality of the inlets located on the other side of the center line are arranged on the inner wall of the second sub-slot.

21. The excitation unit cooling system of a motor according to claim 14, characterized in that: The shape of the annular flow path is one of a circular ring, an elliptical ring and a polygonal ring.

22. The excitation unit cooling system of a motor according to claim 14, characterized in that: The excitation cooling branch also includes: A liquid outlet flow path is provided on the stator disc body and extends in the radial direction of the stator disc body. An outlet communicating with the liquid outlet flow path is provided at the bottom of the outer peripheral surface of the stator outer ring portion.

23. The excitation unit cooling system of a motor according to claim 12, characterized in that: The excitation stator housing has a center line perpendicular to its axial direction and extending in the up-down direction, the liquid outlet flow paths are multiple and symmetrically arranged about the center line, the outlets are multiple and symmetrically arranged about the center line, and the multiple outlets are connected to the multiple liquid outlet flow paths in a one-to-one correspondence.

24. The excitation unit cooling system of a motor according to claim 13, characterized in that: The shape of the excitation cooling branch is spiral.

25. The excitation unit cooling system of a motor according to claim 11, characterized in that: The excitation stator component also includes: The excitation stator winding is arranged on the excitation stator core, and a first filling piece is filled between the excitation stator winding and the excitation stator core.

26. The excitation unit cooling system of a motor according to claim 6, characterized in that: The excitation rotor component comprises: Excitation rotor housing; An excitation rotor core, wherein the excitation rotor core is arranged on the excitation rotor housing; The excitation rotor winding is arranged on the excitation rotor core, and a second filling piece is arranged between the excitation rotor winding and the excitation rotor core.

27. The excitation unit cooling system of a motor according to claim 26, characterized in that: The excitation rotor component also includes a circuit board; The excitation rotor housing comprises: The outer ring of the rotor; A rotor disc body, the rotor disc body surrounds the outer peripheral side of the inner ring portion, and the excitation rotor core is arranged on the rotor disc body; The portion of the rotor outer ring portion that extends beyond the rotor disk body and faces the excitation rotor component surrounds a first accommodating groove, and the portion of the rotor outer ring portion that extends beyond the rotor disk body and faces away from the excitation rotor component surrounds a second accommodating groove. The excitation rotor core is arranged in the first accommodating groove, and the circuit board is arranged in the second accommodating groove.

28. The excitation unit cooling system of a motor according to claim 27, characterized in that: The first accommodating groove and / or the second accommodating groove is filled with a third filling member.

29. An electrically excited synchronous motor, characterized in that: include: An excitation unit cooling system for a motor according to any one of claims 1 to 28.

30. A drive assembly, characterized in that: include: The electrically excited synchronous motor as claimed in claim 29.

31. A vehicle, characterized in that: include: The electrically excited synchronous motor as claimed in claim 29 or the drive assembly as claimed in claim 30.

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