Dynamic balance plate, rotor assembly, motor and vehicle

Abstract

The utility model provides a dynamic balance plate, a rotor assembly, a motor and a vehicle, the dynamic balance plate is used for a motor rotor, the dynamic balance plate is provided with a shaft hole, and a motor shaft passes through the shaft hole; the annular groove is arranged to surround the shaft hole; the first oil guide groove is used for guiding cooling oil into the rotor iron core, the first oil guide groove extends from the annular groove in the radial direction, and the first oil guide groove is provided with at least two branches; the oil outlet groove sets are used for guiding cooling oil out of the rotor iron core and comprise first oil outlet grooves and second oil outlet grooves, the number of the second oil outlet grooves is the same as that of branches of the first oil outlet grooves, and the multiple first oil outlet grooves and the multiple oil outlet groove sets are evenly arranged in a staggered mode in the circumferential direction of the dynamic balance plate; according to the dynamic balance plate, cooling oil can be introduced into the magnetic steel groove to directly cool the magnetic steel, and the cooling efficiency of the magnetic steel is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor cooling, in particular to a dynamic balance plate, a rotor assembly, a motor and a vehicle. BACKGROUND

[0002] For high-performance or high-power-density motors, such as drive motors in new energy vehicles, rotor oil cooling is a highly efficient cooling method. Rotor oil cooling directly introduces cooling oil into the rotor of the motor to achieve more direct and efficient heat exchange, and the cooling oil can be further thrown onto the stator by the rotor to cool the stator. Compared with the traditional water cooling method, the oil cooling method has higher cooling efficiency, can maximize the potential performance of the motor, and improve the power density and torque density of the motor.

[0003] In the known rotor oil cooling method, the cooling oil is usually introduced into the weight-reducing holes of the rotor core to cool the rotor core and the rotor magnet.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those skilled in the art. CONTENT OF THE INVENTION

[0005] One aspect of the present application aims to solve the technical problem of how to better cool the rotor magnet.

[0006] In addition, other aspects of the present application also aim to solve or alleviate other technical problems existing in the prior art.

[0007] The present application provides a dynamic balance plate, a rotor assembly, a motor and a vehicle. Specifically, according to one aspect of the present application, there is provided:

[0008] A dynamic balance plate for a motor rotor, wherein the dynamic balance plate is provided with:

[0009] a shaft hole, the shaft hole being passed through by a motor shaft;

[0010] a ring groove, the ring groove being arranged around the shaft hole;

[0011] a first oil guide groove for guiding cooling oil to a rotor core, the first oil guide groove extending in a radial direction from the ring groove, and the first oil guide groove having at least two branches;

[0012] a set of oil outlet grooves for guiding cooling oil out of the rotor core, the set of oil outlet grooves including a first oil outlet groove and a same number of second oil outlet grooves as the number of branches of the first oil guide groove,

[0013] The first oil guide grooves and the oil outlet groove groups are arranged uniformly and alternately along a circumferential direction of the dynamic balance plate.

[0014] Optionally, according to an embodiment of the present application, the first oil guide groove comprises a straight line part and a branch part connected from the ring groove along a radial direction, and the branch part comprises four branches.

[0015] Optionally, according to an embodiment of the present application, a second oil guide groove is further arranged on the dynamic balance plate, the second oil guide groove extends outward from the ring groove, the extension length of the second oil guide groove is less than the extension length of the first oil guide groove, and at least two second oil guide grooves are arranged between two adjacent first oil guide grooves along the circumferential direction.

[0016] Optionally, according to an embodiment of the present application, a third oil outlet groove is further arranged on the dynamic balance plate, the third oil outlet groove is arranged beside the second oil guide groove along the circumferential direction and staggered with the second oil guide groove, and one third oil outlet groove is arranged beside each second oil guide groove.

[0017] According to a second aspect of the present application, the present application provides a rotor assembly for an electric machine, wherein the rotor assembly comprises:

[0018] An electric machine shaft;

[0019] A rotor core, wherein a through hole for the electric machine shaft to pass through and a plurality of weight reduction holes and a plurality of magnetic steel groove groups are arranged around the through hole on the rotor core, each magnetic steel groove group comprises at least two magnetic steel grooves, and the plurality of weight reduction holes and the plurality of magnetic steel groove groups are arranged uniformly and alternately along a circumferential direction of the rotor core;

[0020] A first dynamic balance plate and a second dynamic balance plate, wherein the first dynamic balance plate and the second dynamic balance plate are arranged to contain the structure of the dynamic balance plate described above;

[0021] The first dynamic balance plate and the second dynamic balance plate are arranged at two ends of the rotor core respectively and staggered, so that the first oil guide groove of the first dynamic balance plate communicates with the first oil outlet groove of the second dynamic balance plate through the weight reduction hole and communicates with the second oil outlet groove of the second dynamic balance plate through the magnetic steel groove, and the first oil guide groove of the second dynamic balance plate communicates with the first oil outlet groove of the first dynamic balance plate through the weight reduction hole and communicates with the second oil outlet groove of the first dynamic balance plate through the magnetic steel groove.

[0022] Optionally, according to an embodiment of the second aspect of the application, each of the magnetic steel slot groups comprises two first magnetic steel slots and two second magnetic steel slots arranged in a V shape in a radial direction respectively, the length of the first magnetic steel slots is greater than that of the second magnetic steel slots, a magnetic steel is installed in each magnetic steel slot, and a first gap close to the shaft hole in the radial direction and a second gap away from the shaft hole in the radial direction exist between the magnetic steel and the two ends of the magnetic steel slot respectively.

[0023] Optionally, according to an embodiment of the second aspect of the application, the first oil guide groove comprises a straight line part and a branch part connected in a radial direction from the ring groove, the straight line part is arranged between two adjacent magnetic steel slot groups and communicates with the weight-reducing hole, the branch part comprises four branches which are symmetrically connected to one first magnetic steel slot and one second magnetic steel slot in the magnetic steel slot group adjacent thereto in pairs, and the end of the branch part is connected to the second gap of the magnetic steel slot.

[0024] Optionally, according to an embodiment of the second aspect of the application, a second oil guide groove is further arranged on each dynamic balance plate, the second oil guide groove extends outward from the ring groove, at least two second oil guide grooves are arranged between two adjacent first oil guide grooves in a circumferential direction, and each second oil guide groove is connected to the first gap of one first magnetic steel slot.

[0025] Optionally, according to an embodiment of the second aspect of the application, a third oil outlet groove is further arranged on each dynamic balance plate, the third oil outlet groove is arranged beside the second oil guide groove in a circumferential direction staggered with the second oil guide groove, each third oil outlet groove is connected to the first gap of one first magnetic steel slot, and the first dynamic balance plate and the second dynamic balance plate are arranged such that the second oil guide groove of the first dynamic balance plate communicates with the third oil outlet groove of the second dynamic balance plate through the first magnetic steel slot, and the second oil guide groove of the second dynamic balance plate communicates with the third oil outlet groove of the first dynamic balance plate through the first magnetic steel slot.

[0026] According to a third aspect of the application, the application provides an electric machine, wherein the electric machine comprises the above-mentioned rotor assembly and stator.

[0027] According to a fourth aspect of the application, the application provides a vehicle, wherein the vehicle comprises the above-mentioned electric machine.

[0028] The benefits of the application include:

[0029] 1. The dynamic balance plate of the application can distribute the cooling oil introduced from the shaft of the electric machine into each channel of the rotor core, especially the magnetic steel slot, and can realize direct oil cooling for the rotor magnetic steel, especially each rotor magnetic steel, thereby improving the cooling efficiency of the rotor magnetic steel.

[0030] 2. The oil guide groove and the oil outlet groove of the present application are designed to match the structure of the weight-reducing groove and the magnetic steel groove in the rotor core, which can cool each magnetic steel while simplifying the structure of the oil guide groove and the oil outlet groove as much as possible, and realizes the coordinated cooling of the rotor core by the two dynamic balance plates without setting too many oil guide grooves. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other features of the present application will become more apparent by describing in detail the best modes contemplated for carrying out the application while referring to the accompanying drawings. It is to be understood that the drawings are designed solely for the purpose of illustration and are not intended to limit the scope of the present application in any way. Like reference numerals in the drawings designate corresponding parts throughout the several views, wherein:

[0032] Figure 1 A side view of a dynamic balance plate according to an embodiment of the present application is shown, as viewed from the side of the dynamic balance plate facing the rotor core;

[0033] Figure 2 A side view of the dynamic balance plate according to an embodiment of the present application is shown, as viewed from the other side of the dynamic balance plate;

[0034] Figure 3 A side view of a rotor core of a rotor assembly according to an embodiment of the present application is shown;

[0035] Figure 4 A side view of a rotor assembly is shown in perspective, wherein the dynamic balance plate is shown in a semi-transparent manner;

[0036] Figure 5 A direction of flow of cooling oil in the rotor assembly is shown. DETAILED DESCRIPTION

[0037] It is readily understood that the technical solution according to the present application can be implemented in many different ways without changing the essential characteristics of the application. Therefore, the specific embodiments and drawings are merely illustrative and should not be considered as limiting the scope of the technical solution according to the present application or as limiting the technical solution according to the present application.

[0038] In this specification, the terms "upper", "lower", "left", "right", "front", "back", "front face", "back face", "top", "bottom", and the like, as well as their derivatives (e.g., "upper", "lower", "left", "right", "front", "back", "front face", "back face", "top", "bottom", etc.), refer to the orientation of the structures shown in the drawings, and are relative concepts, and thus can change accordingly depending on the different positions and different use states. Therefore, these or other orientation terms should not be interpreted as limiting terms. In addition, the terms "first", "second", "third", and the like or similar expressions are only used for description and differentiation purposes, and cannot be understood as indicating or implying the relative importance of the corresponding members or the order or assembly order of the members.

[0039] In the known motor with rotor oil cooling, especially for new energy vehicles, the cooling oil is introduced into the rotor core through the motor shaft to cool it. A weight-reducing hole extending in the axial direction is usually arranged in the rotor core, and the cooling oil is introduced into the weight-reducing hole and flows in the axial direction in the rotor core, thereby cooling the entire rotor core, including the components on the rotor, such as the rotor magnet steel, etc. However, in this cooling mode, the cooling oil does not directly contact the magnet steel slot or the magnet steel, and the cooling of the magnet steel is indirectly achieved through heat transfer of the rotor core body, so the cooling efficiency of the rotor magnet steel is low.

[0040] The dynamic balance plate of the present application can introduce cooling oil through the weight-reducing hole while also introducing cooling oil into the magnet steel slot to directly cool the magnet steel, significantly reducing the working temperature of the magnet steel, improving the cooling efficiency of the magnet steel, and enabling the motor to use low-temperature grade magnet steel, thereby reducing the cost of the magnet steel.

[0041] Reference Figure 1 and Figure 2 respectively show the side view of one face of the dynamic balance plate 100 facing the rotor core 300 and the side view of the other face according to one embodiment of the present application. The dynamic balance plate 100 is penetrated by the motor shaft 400, and therefore has a shaft hole 110 for the motor shaft 400 to penetrate. An annular groove 120 is arranged around the shaft hole 110, which is used to introduce cooling oil from the motor shaft 400 to the side of the dynamic balance plate 100. The first oil guide groove 130 and the oil outlet groove group 140 are also arranged on the side of the dynamic balance plate 100. Figure 1 The first oil guide groove 130 is used to guide the oil to the rotor core 300, which extends in the radial direction from the annular groove 120 on the side, and the first oil guide groove 130 has at least two branches, and the oil outlet groove group 140 is used to guide the cooling oil out of the rotor core, which has a plurality of oil outlet grooves, especially a first oil outlet groove 141 and a plurality of second oil outlet grooves 142. Among them, the number of second oil outlet grooves 142 is the same as the number of branches of the first oil guide groove 130. A plurality of first oil guide grooves 130 and a plurality of oil outlet groove groups 140 are uniformly staggered along the circumferential direction of the dynamic balance plate 100. In the embodiment of the present application, the dynamic balance plate 100 has 4 first oil guide grooves 130 and 4 oil outlet groove groups 140, which are uniformly staggered along the circumferential direction respectively. This arrangement facilitates the arrangement of the two dynamic balance plates 100, 200 on the rotor core 300 at an angle (in the embodiment of the present application, 180 degrees) to each other. Figure 1 The first oil guide groove 130 is used to guide the oil to the rotor core 300, which extends in the radial direction from the annular groove 120 on the side, and the first oil guide groove 130 has at least two branches, and the oil outlet groove group 140 is used to guide the cooling oil out of the rotor core, which has a plurality of oil outlet grooves, especially a first oil outlet groove 141 and a plurality of second oil outlet grooves 142. Among them, the number of second oil outlet grooves 142 is the same as the number of branches of the first oil guide groove 130. A plurality of first oil guide grooves 130 and a plurality of oil outlet groove groups 140 are uniformly staggered along the circumferential direction of the dynamic balance plate 100. In the embodiment of the present application, the dynamic balance plate 100 has 4 first oil guide grooves 130 and 4 oil outlet groove groups 140, which are uniformly staggered along the circumferential direction respectively. This arrangement facilitates the arrangement of the two dynamic balance plates 100, 200 on the rotor core 300 at an angle (in the embodiment of the present application, 180 degrees) to each other. Figure 1 The first oil guide groove 130 is used to guide the oil to the rotor core 300, which extends in the radial direction from the annular groove 120 on the side, and the first oil guide groove 130 has at least two branches, and the oil outlet groove group 140 is used to guide the cooling oil out of the rotor core, which has a plurality of oil outlet grooves, especially a first oil outlet groove 141 and a plurality of second oil outlet grooves 142. Among them, the number of second oil outlet grooves 142 is the same as the number of branches of the first oil guide groove 130. A plurality of first oil guide grooves 130 and a plurality of oil outlet groove groups 140 are uniformly staggered along the circumferential direction of the dynamic balance plate 100. In the embodiment of the present application, the dynamic balance plate 100 has 4 first oil guide grooves 130 and 4 oil outlet groove groups 140, which are uniformly staggered along the circumferential direction respectively. This arrangement facilitates the arrangement of the two dynamic balance plates 100, 200 on the rotor core 300 at an angle (in the embodiment of the present application, 180 degrees) to each other. Figure 1In the embodiment shown in FIG. 1, the first oil guide groove 130 is arranged in a staggered manner with the outflow groove group 140 (i.e., the angle between the first oil guide groove 130 and the outflow groove group 140 is 45°), so that the oil can flow between the two dynamic balance plates 100, 200 through the holes and slots in the rotor core 300. It should be understood that the dynamic balance plate 100 can also have different numbers of first oil guide grooves 130 and outflow groove groups 140 according to its structure, which should also be included in the scope of the present application.

[0042] In an embodiment of the present application, the first oil guide groove 130 includes a straight portion 131 connected from the ring groove 120 in the radial direction and a branch portion 132, and the branch portion 132 includes 4 branches. It should be understood that the first oil guide groove 130 can also have any number of branches greater than two, and the number of branches can be set by those skilled in the art according to the different number and arrangement of the magnetic steel grooves 330 of the stator core 300, which should also be included in the scope of the present application. Figure 1

[0043] In an embodiment of the present application, the slot width of the branch portion 132 is smaller than the slot width of the straight portion 131. For the first oil guide groove 130, the straight portion 131 is used to supply oil to the weight-reducing holes 320 of the rotor core 300, and the branch portion 132 is used to supply oil to the magnetic steel grooves 331, 332, respectively. The required flow of cold oil for the magnetic steel grooves 331, 332 is generally smaller than the required flow of cooling oil for the weight-reducing holes 320. Moreover, for the branch portion 132, a smaller slot width is beneficial to improve the overall strength of the dynamic balance plate 100. Therefore, by setting the slot width of the branch portion 132 to be smaller than the slot width of the straight portion 131, the distribution of cooling oil is facilitated, and the strength of the dynamic balance plate 100 is also improved.

[0044] In an embodiment of the present application, a second oil guide groove 150 is also provided on the dynamic balance plate 100, which is also used to guide cooling oil to the rotor core 300. The second oil guide groove 150 also extends outward from the ring groove 120, especially in the radial direction or a straight direction at an angle to the radial direction, and its extension length is smaller than that of the first oil guide groove 130. At least two second oil guide grooves 150 are arranged between adjacent two first oil guide grooves 130 in the circumferential direction. Figure 1 In an embodiment of the present application, exactly two second oil guide grooves 150 are arranged between adjacent two first oil guide grooves 130 in the circumferential direction, and the two second oil guide grooves 150 are arranged on the same side of the first oil guide groove 130. Figure 1 In an embodiment of the present application, the second oil guide groove 150 is designed in different shapes according to design requirements. It should be understood that the two second oil guide grooves 150 can also be designed in the same shape. The arrangement of the second oil guide groove 150 can better guide the oil to the positions of the magnetic steel grooves 331, 332, especially the positions not affected by the first oil guide groove 130, so as to achieve sufficient cooling of the magnetic steel 340.​

[0045] In one embodiment of the present application, a third oil outlet groove 160 is further arranged on the dynamic balance plate 100, which is used to guide the cooling oil out of the rotor core 300. The third oil outlet groove 160 is arranged beside the second oil guide groove 150 in the circumferential direction and is staggered with the second oil guide groove 150. One third oil outlet groove 160 is arranged beside each second oil guide groove 150. The third oil outlet groove 160 is spaced apart from the ring groove 120 or the second oil guide groove 150. The third oil outlet groove 160 is used to match the position of the second oil guide groove of the other dynamic balance plate 200, so as to guide the oil out of the rotor.

[0046] The structure of the single dynamic balance plate 100 is specifically introduced above. The matching arrangement of the two dynamic balance plates 100, 200 in the rotor assembly 10 and the positional relationship between the structure of the dynamic balance plates 100, 200 and the structure components (weight reduction holes, magnetic steel grooves, magnetic steels, etc.) of the rotor core 300 will be described in detail below when the structure of the rotor assembly 10 is introduced.

[0047] The second aspect of the present application further proposes a rotor assembly 10. The rotor assembly 10 has two dynamic balance plates 100, 200 of the same structure, a rotor core 300 and a motor shaft 400. The two dynamic balance plates are respectively referred to as a first dynamic balance plate 100 and a second dynamic balance plate 200 below, which are identically constructed and both have the structure of the dynamic balance plate 100 described above, so the specific structure of the second dynamic balance plate 200 will not be described again. The two dynamic balance plates 100, 200 are respectively arranged on the two ends of the rotor core 300 and are arranged at a certain angle.

[0048] In one embodiment of the second aspect of the present application, a through hole 310 for the motor shaft 400 to pass through is arranged on the rotor core 300, and a plurality of weight reduction holes 320 and a plurality of magnetic steel groove groups 330 are arranged around the through hole 310. Each magnetic steel groove group 330 includes at least two magnetic steel grooves, and the plurality of weight reduction holes 320 and the plurality of magnetic steel groove groups 330 are uniformly and alternately arranged in the circumferential direction of the rotor core 300.

[0049] Reference Figure 3 which shows a side view of the rotor core 300 of the rotor assembly 10 according to one embodiment of the present application. In Figure 3 In the embodiment of the present application, each magnetic steel groove group 330 includes two first magnetic steel grooves 331 and two second magnetic steel grooves 332 arranged in a V shape in the radial direction, respectively. The length of the first magnetic steel groove 331 is greater than that of the second magnetic steel groove 332. A magnetic steel 340 is arranged in each magnetic steel groove 331, 332, and a first gap 341 close to the shaft hole 110 in the radial direction and a second gap 342 away from the shaft hole 110 in the radial direction are respectively arranged between the magnetic steel 340 and the two ends of the magnetic steel groove 331, 332.Figure 3 In the rotor core 300, there are a total of 8 magnet slot groups.

[0050] It should be understood that, in embodiments not shown, each magnet slot group 330 may also include a different number of magnet slots, for example, it may also include two magnet slots arranged in a V-shape; the magnet slots may have different arrangements, and each dynamic balancing plate may also have a different number of magnet slot groups, all of which should be included within the scope of this application.

[0051] In one embodiment of the second aspect of this application, the first dynamic balancing plate 100 and the second dynamic balancing plate 200 are respectively staggered at both ends of the rotor core 300, particularly staggered at a 45° angle, such that the first oil guide groove 130 of the first dynamic balancing plate 100 is connected to the first oil outlet groove of the second dynamic balancing plate 200 through the weight reduction hole 320 and is connected to the second oil outlet groove of the second dynamic balancing plate 200 through the magnet grooves 331 and 332, and the first oil guide groove of the second dynamic balancing plate 200 is connected to the first oil outlet groove 141 of the first dynamic balancing plate 100 through the weight reduction hole 320 and is connected to the second oil outlet groove 142 of the first dynamic balancing plate 100 through the magnet grooves 331 and 332. With this arrangement, part of the cooling oil can flow from the first balance plate 100 through the rotor core 300 to the second balance plate 200, and the other part can flow from the second balance plate 200 through the rotor core 300 to the first balance plate 100. The two parts flow in different weight reduction holes 320 and magnet slot groups 330, which not only improves the cooling efficiency, but also eliminates the need to set too many oil guide grooves on a single dynamic balance plate. The structure is simple and easy to process.

[0052] refer to Figure 4 It shows a side view of the rotor assembly 10 in perspective. Figure 4 In one embodiment, a side view of the rotor assembly 10 is shown, wherein the dynamic balance plate 100 on this side is semi-transparent to specifically show the positional relationship between the structure on the dynamic balance plate 100 and the structural components on the rotor core 300.

[0053] exist Figure 4 In the embodiment, the straight portion 131 of the first oil guide groove 130 is disposed between two adjacent magnetic groove groups 330 and communicates with the weight reduction hole 320. The branch portion 132 includes four branches, which are symmetrically connected to a first magnetic groove 331 and a second magnetic groove 332 in the adjacent magnetic groove group 330. The end of the branch portion 132 is connected to the second gap 342 of the magnetic grooves 331 and 332.

[0054] The straight portion 131 of the first oil guide groove 130 is arranged between two adjacent magnetic steel groove groups 330, and just utilizes the space between the two adjacent magnetic steel groove groups 330, so that the straight portion 131 of the first oil guide groove 130 can have a suitable width, and the straight portion 131 can be directly connected to the weight-reducing hole 320 in the radial direction, without the need for additionally arranging a separate oil guide groove connected to the weight-reducing hole 320. At the same time, the branch portion 132 can be connected to multiple magnetic steel grooves in the two adjacent magnetic steel groove groups 330, and is closer to the magnetic steel grooves of the two adjacent magnetic steel groove groups 330, facilitating the design and processing of the branch portion 132.

[0055] It should be understood that the number and arrangement of the branch portions 132 can be adjusted by those skilled in the art according to different numbers and arrangements of magnetic steel grooves. For example, when each group of magnetic steel grooves 330 has only two V-shaped magnetic steel grooves, the number of branches of the branch portion 132 can be 2, and these variants should also be included within the scope of the present application.

[0056] In one embodiment of the second aspect of the present application, each second oil guide groove 150 on the dynamic balance plate 100 is connected to the first gap 341 of one first magnetic steel groove 331, and each third oil outlet groove 160 is connected to the first gap 341 of one first magnetic steel groove 331. The first dynamic balance plate 100 and the second dynamic balance plate 200 are arranged such that the second oil guide groove 150 of the first dynamic balance plate 100 communicates with the third oil outlet groove of the second dynamic balance plate 200 through the first magnetic steel groove 331, and the second oil guide groove of the second dynamic balance plate 200 communicates with the third oil outlet groove 160 of the first dynamic balance plate 100 through the first magnetic steel groove 331. It can be seen from Figure 4 It can be seen from FIG. 6 that the branch portion 132 of the first oil guide groove 130 is connected to all the second gaps 342 of each group of four magnetic steel grooves 331, 332, but the first gaps 341 of the four magnetic steel grooves 331, 332 are not connected to the first oil guide groove 130. Therefore, in this embodiment, for each magnetic steel groove group 330, the second oil guide groove 150 of the first balance plate 100 is connected to the first gap 141 of one first magnetic steel groove 331 of the magnetic steel groove group 330. The third oil outlet groove 160 of the first balance plate 100 is connected to the first gap 141 of another first magnetic steel groove 331 of the magnetic steel groove group 330; correspondingly, the second oil guide groove and the third oil outlet groove of the second balance plate 200 are reversed. In this way, the cooling oil can enter the first gaps 141 of the two first magnetic steel grooves 331 of each magnetic steel groove group 330, thereby achieving more sufficient and efficient cooling of the magnetic steel 340 in the first magnetic steel groove 331.

[0057] Reference is made to Figure 5The cooling oil flows in the rotor assembly 10 as shown in the figure. The cooling oil flows from the motor shaft 400 through the inlet groove 311 provided at the through hole 310 of the rotor core 300 into the ring groove 120 of the dynamic balance plate 100, and then flows into the oil guide grooves 130, 150 of the dynamic balance plate 100 through the ring groove 120, flows to the weight-reducing holes 320 and the magnetic steel grooves 331, 332 of the rotor core 300 through the oil guide grooves 130, 150, and then flows into the oil outlet grooves 141, 142, 160 matched with the oil guide grooves 130, 150, and finally the cooling oil flows out of the oil outlet grooves 141, 142, 160 and is thrown to the stator for cooling of the stator.

[0058] The third aspect of the present application shows an electric machine 1 comprising the rotor assembly 10 described above and a stator.

[0059] The electric machine has all the beneficial technical effects of the rotor assembly 10 described above, which are not repeated here.

[0060] The fourth aspect of the present application proposes a vehicle comprising the electric machine described above.

[0061] The vehicle has all the beneficial technical effects of the rotor assembly 10 described above, which are not repeated here.

[0062] It should be understood that the electric machine of the present application can be installed on various vehicles, including passenger cars, trucks, buses, hybrid electric vehicles, pure electric vehicles, etc. Therefore, the subject of the present application also aims to protect various vehicles equipped with the electric machine of the present application.

[0063] It should be understood that all the above preferred embodiments are exemplary and not limiting, and various modifications or variations of the specific embodiments described above made by those skilled in the art under the concept of the present application shall be within the legal protection scope of the present application.

[0064] The related user personal information that may be involved in the embodiments of the present application is strictly in accordance with the requirements of laws and regulations, follows the principles of legality, legitimacy and necessity, is based on the reasonable purpose of business scene, and processes the personal information of the user actively provided or generated in the process of using the product / service and authorized by the user.

[0065] The user personal information processed by the applicant will be different for specific product / service scenarios, and the specific scenarios of the user using the product / service shall be used as the standard, which may involve the user's account information, device information, driving information, vehicle information or other related information. The applicant will treat the user's personal information and its processing with high diligence and obligation.

[0066] The applicant attaches great importance to the security of the user's personal information, and has taken security protection measures in accordance with the industry standard, which is reasonable and feasible to protect the user's information, so as to prevent the unauthorized access, public disclosure, use, modification, damage or loss of personal information.

Claims

1. A dynamic balancing plate for a motor rotor, characterized by, A shaft hole is provided on the dynamic balance plate, the shaft hole is penetrated by a motor shaft; A ring groove is provided around the shaft hole; A first oil guide groove is used to guide the cooling oil to the rotor core, the first oil guide groove extends from the ring groove in the radial direction, and the first oil guide groove has at least two branches; An oil outlet groove group is used to guide the cooling oil out of the rotor core, the oil outlet groove group includes a first oil outlet groove and a second oil outlet groove in the same number as the branches of the first oil guide groove, Wherein, the first oil guide grooves and the oil outlet groove groups are uniformly staggered along the circumferential direction of the dynamic balance plate. The first oil guide groove includes a straight line part and a branch part connected from the ring groove in the radial direction, and the branch part includes four branches.

2. The dynamic balancing plate according to claim 1, characterized in that, A second oil guide groove is also provided on the dynamic balance plate, the second oil guide groove extends outward from the ring groove, the extension length of the second oil guide groove is less than the extension length of the first oil guide groove, and at least two second oil guide grooves are arranged between adjacent first oil guide grooves in the circumferential direction.

3. The dynamic balancing board of claim 1, wherein, A third oil outlet groove is also provided on the dynamic balance plate, the third oil outlet groove is arranged beside the second oil guide groove in the circumferential direction, and one third oil outlet groove is arranged beside each second oil guide groove.

4. The dynamic balancing plate of claim 3, wherein, The rotor assembly includes:

5. A rotor assembly for an electric machine characterized by, A motor shaft; A rotor core, a through hole for the motor shaft to pass through is provided on the rotor core, and a plurality of weight reduction holes and a plurality of magnetic steel groove groups are provided around the through hole, each magnetic steel groove group includes at least two magnetic steel grooves, and the plurality of weight reduction holes and the plurality of magnetic steel groove groups are uniformly staggered along the circumferential direction of the rotor core; A first dynamic balance plate and a second dynamic balance plate are arranged to contain the structure of the dynamic balance plate according to any one of claims 1 to 4; The first dynamic balance plate and the second dynamic balance plate are arranged at different positions at both ends of the rotor core respectively, so that the first oil guide groove of the first dynamic balance plate communicates with the first oil outlet groove of the second dynamic balance plate through the weight reduction hole and communicates with the second oil outlet groove of the second dynamic balance plate through the magnetic steel groove, and the first oil guide groove of the second dynamic balance plate communicates with the first oil outlet groove of the first dynamic balance plate through the weight reduction hole and communicates with the second oil outlet groove of the first dynamic balance plate through the magnetic steel groove. Each of the magnetic steel groove groups includes two first magnetic steel grooves and two second magnetic steel grooves arranged in a V shape in the radial direction respectively, the length of the first magnetic steel groove is greater than that of the second magnetic steel groove, a magnetic steel is installed in each magnetic steel groove, and there are a first gap close to the shaft hole in the radial direction and a second gap away from the shaft hole in the radial direction between the magnetic steel and the two ends of the magnetic steel groove respectively.

6. The rotor assembly of claim 5, wherein ​ 7. The rotor assembly of claim 6, wherein The first oil guide groove comprises a straight portion and a branch portion connected in a radial direction from the ring groove, the straight portion is arranged between two adjacent magnetic steel groove groups and communicates with the weight-reducing hole, the branch portion comprises four branches which are symmetrically connected to one first magnetic steel groove and one second magnetic steel groove in the adjacent magnetic steel groove group, and the end of the branch portion is connected to the second gap of the magnetic steel groove.

8. The rotor assembly of claim 6, wherein A second oil guide groove is further arranged on each dynamic balance plate, the second oil guide groove extends outward from the ring groove, at least two second oil guide grooves are arranged between two adjacent first oil guide grooves in a circumferential direction, and each second oil guide groove is connected to the first gap of one first magnetic steel groove.

9. The rotor assembly of claim 8, wherein, A third oil outlet groove is further arranged on each dynamic balance plate, the third oil outlet groove is arranged beside the second oil guide groove in a circumferential direction staggered with the second oil guide groove, each third oil outlet groove is connected to the first gap of one first magnetic steel groove, and the first dynamic balance plate and the second dynamic balance plate are arranged such that the second oil guide groove of the first dynamic balance plate communicates with the third oil outlet groove of the second dynamic balance plate through the first magnetic steel groove, and the second oil guide groove of the second dynamic balance plate communicates with the third oil outlet groove of the first dynamic balance plate through the first magnetic steel groove.

10. An electric machine characterized by The motor comprises the rotor assembly and the stator according to any one of claims 5 to 9.

11. A vehicle characterized by comprising: The vehicle comprises the motor according to claim 10.

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