Rotor core, motor rotor, motor and automobile

Abstract

The application provides a rotor core, a motor rotor, a motor and an automobile. The rotor core is provided with a rotor shaft cavity, a plurality of first cooling channels and a plurality of first rotor slots. The rotor shaft cavity, the first cooling channels and the first rotor slots all penetrate the rotor core along the axial direction of the rotor core. The plurality of first rotor slots and the plurality of first cooling channels are respectively distributed along the circumferential direction of the rotor core. Each first cooling channel is located between the rotor shaft cavity and the first rotor slot, and each first rotor slot is in communication with the first cooling channel. Through the arrangement, the cooling medium flowing in the first cooling channel directly contacts and exchanges heat with the permanent magnet in the first rotor slot, so that the permanent magnet is cooled, the risk of demagnetization of the permanent magnet due to excessively high temperature is prevented, and the performance of the motor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor core, a motor rotor, a motor and an automobile. BACKGROUND

[0002] With the rapid development of electric vehicles, the speed and power density requirements of vehicle driving motors are becoming higher and higher. The rotor loss of the traditional built-in permanent magnet synchronous motor rotor increases at high speed due to deep demagnetization, and the heat is serious, which needs to be cooled to realize high power density.

[0003] In the existing motor, the cooling medium of the rotor generally comes from the rotating shaft, and the heat source is close to the surface of the rotor. The cooling medium is far away from the heat source, which leads to poor cooling effect and increases the risk of demagnetization of the permanent magnet, affecting the performance of the motor. SUMMARY

[0004] In view of this, the present application provides a rotor core, a motor rotor, a motor and an automobile, which can improve the cooling effect of the motor rotor.

[0005] Specifically, the technical scheme comprises the following:

[0006] In a first aspect, the present application provides a rotor core, which is provided with a rotor shaft cavity, a plurality of first cooling channels and a plurality of first rotor slots. The rotor shaft cavity, the first cooling channels and the first rotor slots all penetrate the rotor core along the axial direction of the rotor core. A plurality of first rotor slots and a plurality of first cooling channels are respectively distributed along the circumferential direction of the rotor core. Each first cooling channel is located between the rotor shaft cavity and the first rotor slot, and each first rotor slot is in communication with the first cooling channel.

[0007] Through the above arrangement, the cooling liquid flowing in the first cooling channel directly contacts and exchanges heat with the first permanent magnet in the first rotor slot, thereby cooling the first permanent magnet and preventing the first permanent magnet from demagnetizing due to high temperature, which helps to improve the performance of the motor.

[0008] In an optional embodiment, the rotor core comprises first magnetic poles and second magnetic poles with opposite polarities which are alternately distributed along the circumferential direction of the rotor core, and the first rotor slots are arranged between every two adjacent first magnetic poles and second magnetic poles.

[0009] The rotor core is also provided with a plurality of second rotor slots which are spaced apart. Two second rotor slots arranged in a V shape are arranged in each first magnetic pole and second magnetic pole.

[0010] Through the arrangement, the space of the rotor core is fully utilized, the space utilization of the rotor core is improved, the high power density of the motor is more easily realized, meanwhile, the air gap flux waveform is improved, and the motor performance is improved.

[0011] In an optional embodiment, a connecting portion is arranged between every two adjacent first cooling channels, and each connecting portion is located in the first magnetic pole or in the second magnetic pole.

[0012] Through the arrangement, the magnetic flux path formed between the adjacent first magnetic pole and the second magnetic pole is avoided, the motor rotor leakage is reduced, the motor efficiency is prevented from being reduced, the temperature rise is prevented from being too high, the stability and reliability of the motor are improved.

[0013] In an optional embodiment, the two ends of each second rotor slot in the extension direction are respectively provided with air slots.

[0014] Through the arrangement, the magnetic circuit structure is improved, and the leakage flux formed by the second permanent magnet in the second rotor slot is reduced.

[0015] In an optional embodiment, the width of the two air slots of each second rotor slot gradually decreases towards the side away from each other.

[0016] Through the arrangement, while the magnetic circuit structure is improved, the second permanent magnet in the second rotor slot is limited to a certain extent, the movement of the second permanent magnet along the extension direction of the second rotor slot is prevented, and the installation strength of the second permanent magnet is affected.

[0017] In an optional embodiment, a second cooling channel is arranged in each of the first magnetic pole and the second magnetic pole, the second cooling channel penetrates the rotor core in the axial direction of the rotor core, and the second cooling channel is arranged on the side of the second rotor slot away from the rotor shaft cavity and between two adjacent second rotor slots.

[0018] Through the arrangement, the cooling medium flows in the second cooling channel along the axial direction of the rotor core, the rotor core is cooled, and the second permanent magnet in the second rotor slot is cooled, so that the demagnetization risk of the second permanent magnet caused by high temperature is prevented.

[0019] In an optional embodiment, the rotor core further has a third cooling channel in communication with the first cooling channel, the third cooling channel is located on the side of the first cooling channel close to the second rotor slot, and the side wall of the third cooling channel is convex to the side where the second rotor slot is located relative to the side wall of the first cooling channel.

[0020] Through the arrangement, the rotor core and the second permanent magnet can be cooled, and the structure is simple and reliable, and convenient for processing and manufacturing.

[0021] In a second aspect, the embodiments of the present application provide a motor rotor, which comprises a rotor shaft, a first permanent magnet and the rotor core provided by any one of the embodiments of the first aspect, the rotor shaft is arranged in the rotor shaft cavity, and the first permanent magnet is arranged in the first rotor slot.

[0022] In a third aspect, the embodiments of the present application further provide a motor, which comprises the motor rotor provided by the embodiments of the second aspect.

[0023] In a fourth aspect, the embodiments of the present application further provide an automobile, which comprises the motor provided by the embodiments of the third aspect.

[0024] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects: by arranging each first cooling channel between the rotor shaft cavity and the first rotor slot, and by arranging each first rotor slot in communication with the first cooling channel, the cooling medium flowing in the first cooling channel directly contacts and exchanges heat with the permanent magnet in the first rotor slot, the permanent magnet is cooled and cooled, the risk of demagnetization of the permanent magnet due to excessively high temperature is prevented, and the performance of the motor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 Structure diagram of the rotor core provided by some embodiments of the present application;

[0027] Figure 2 Structure diagram of the rotor core provided by some embodiments of the present application;

[0028] The reference signs in the drawings represent:

[0029] 1-rotor core; 11-rotor shaft cavity; 12-first cooling channel; 13-first rotor slot; 14-first magnetic pole; 15-second magnetic pole; 16-second rotor slot; 161-air slot; 17-second cooling channel; 18-third cooling channel;

[0030] 100-first permanent magnet; 200-second permanent magnet.

[0031] The specific embodiments of the present application have been shown and described in the above drawings and the following description, and will be described in more detail below. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0033] The positional nouns such as “upper”, “lower”, “lateral” and the like involved in the embodiments of the present application are generally based on the relative relationship of the positions shown in the drawings, and these positional nouns are only used to more clearly describe the structure and the relationship between the structures, and are not intended to describe absolute positions. When the product is placed in different attitudes, the positions may change, for example, “upper” and “lower” may be interchanged. Figure 1

[0034] Unless otherwise defined, all the technical terms used in the embodiments of the present application have the same meanings as generally understood by those skilled in the art. Some technical terms appearing in the embodiments of the present application are explained below.

[0035] In order to make the technical solutions and advantages of the present application more clear, the embodiments of the present application will be described in further detail below in combination with the drawings.

[0036] As mentioned in the background, in the existing motor, the permanent magnet of the rotor will cause demagnetization due to long-term work in a high-temperature environment, and therefore it is necessary to adopt forced cooling measures to take away the heat in the permanent magnet synchronous motor.

[0037] In order to improve the performance of the motor, the prior art provides a cooling system for cooling the rotor, wherein the cooling medium of the motor rotor in the cooling system is generally from the rotor shaft, the cooling medium is introduced from the rotor shaft to cool the rotor, but the heat source is close to the surface of the rotor, and the cooling medium is far away from the heat source, which leads to poor cooling effect and easily increases the risk of demagnetization of the permanent magnet, affecting the performance of the motor.

[0038] To solve the above technical problems, the embodiments of the present application provide a rotor core 1.

[0039] As Figure 1 and Figure 2 ​As shown, the rotor core 1 provided by the embodiment of the present application is provided with a rotor shaft cavity 11, a plurality of first cooling channels 12 and a plurality of first rotor slots 13. The rotor shaft cavity 11, the first cooling channels 12 and the first rotor slots 13 all penetrate the rotor core 1 along the axial direction of the rotor core 1. The plurality of first rotor slots 13 and the plurality of first cooling channels 12 are respectively distributed along the circumferential direction of the rotor core 1. Each first cooling channel 12 is located between the rotor shaft cavity 11 and the first rotor slot 13, and each first rotor slot 13 is in communication with the first cooling channel 12.

[0040] The rotor shaft cavity 11 of the rotor core 1 is used for accommodating a rotor shaft. The first cooling channels 12 are used for flowing cooling medium such as cooling oil. The first rotor slots 13 are used for accommodating the first permanent magnets 100.

[0041] Specifically, the rotor core 1 is in the shape of a cylinder. The central axis of the rotor shaft cavity 11 is collinear with the central axis of the rotor core 1. The first rotor slots 13 are located on the side close to the outer sidewall of the rotor core 1. The first cooling channels 12 are located at one end of the first rotor slots 13 close to the rotor shaft cavity 11.

[0042] Exemplarily, as shown in Figure 1 , the first rotor slots 13 extend along the radial direction of the rotor core 1. The cross-sectional profile of the first rotor slots 13 is approximately rectangular. The first permanent magnets 100 are embedded in the first rotor slots 13. The shape and size of the first rotor slots 13 are adapted to the shape and size of the first permanent magnets 100.

[0043] It can be understood that the "cross section" is a section obtained by cutting with a plane perpendicular to the central axis of the rotor core 1.

[0044] Here, the shape of the first rotor slots 13 is adapted to the shape of the first permanent magnets 100, which means that the shape of the first rotor slots 13 is the same as that of the first permanent magnets 100, for example, the first rotor slots 13 are rectangular slots and the first permanent magnets 100 are rectangular blocks. The size of the first rotor slots 13 is adapted to the size of the first permanent magnets 100, which means that the size of the first rotor slots 13 is the same as that of the first permanent magnets 100, or the size of the first rotor slots 13 is slightly larger than that of the first permanent magnets 100, so that the first permanent magnets 100 can be embedded in the first rotor slots 13.

[0045] Furthermore, the plurality of first rotor slots 13 are uniformly distributed around the central axis of the rotor core 1, as shown in Figure 1 and Figure 2 , the first rotor slots 13 are eight in total, and the eight first rotor slots 13 are uniformly distributed along the circumferential direction of the rotor core 1.

[0046] By setting the first rotor slot 13 to extend radially along the rotor core 1, the magnetic flux in the rotor core 1 can be strengthened, which helps to improve the power density of the motor.

[0047] For example, the cross-sectional profile of the first cooling channel 12 is arc-shaped, and multiple first cooling channels 12 are distributed around the central axis of the rotor core 1 along the circumference of the rotor core 1 to form a near-circular annular groove.

[0048] Each of the first cooling channels 12 is connected to at least one of the first rotor slots 13, for example... Figure 1 and Figure 2 As shown, there are four first cooling channels 12, and each first cooling channel 12 is connected to two first rotor slots 13, ensuring that each first rotor slot 13 is connected to the first cooling channel 12, and also so that when the cooling medium is introduced into each first cooling channel 12, the first permanent magnet 100 in the two first rotor slots 13 can be cooled at the same time.

[0049] Specifically, when the cooling medium is introduced into the first cooling channel 12, the cooling medium in the first cooling channel 12 flows along the axial direction of the rotor core 1 and directly contacts the end face of the first permanent magnet 100 near the rotor shaft cavity 11, thereby directly exchanging heat with the first permanent magnet 100 and carrying away the heat generated on the rotor core 1 and the first permanent magnet 100. Compared with the cooling system in the prior art, it has a better cooling effect and is conducive to solving the rotor heating problem caused by high speed and high power density of the motor.

[0050] The rotor core 1 provided in this application embodiment is configured such that each first cooling channel 12 is located between the rotor shaft cavity 11 and the first rotor slot 13, and each first rotor slot 13 is connected to the first cooling channel 12. This allows the coolant flowing in the first cooling channel 12 to directly contact and exchange heat with the first permanent magnet 100 in the first rotor slot 13, thereby cooling the first permanent magnet 100 and preventing the risk of demagnetization due to excessive temperature. This helps to improve the performance of the motor.

[0051] In a further embodiment, the rotor core 1 includes first magnetic poles 14 and second magnetic poles 15 of opposite polarity that are alternately distributed along its circumference, and a first rotor slot 13 is provided between every two adjacent first magnetic poles 14 and second magnetic poles 15; the rotor core 1 also has a plurality of spaced second rotor slots 16, and each magnetic pole has two second rotor slots 16 arranged in a V-shape.

[0052] Exemplarily, the rotor core 1 has eight magnetic poles, four first magnetic poles 14 and four second magnetic poles 15, the first magnetic poles 14 are N poles, the second magnetic poles 15 are S poles, the first magnetic poles 14 and the second magnetic poles 15 are alternately distributed along the circumferential direction of the rotor core 1, and each first rotor slot 13 is located between adjacent first magnetic pole 14 and second magnetic pole 15.

[0053] Exemplarily, as shown in Figure 1 and Figure 2 , two second rotor slots 16 are arranged on each first magnetic pole 14 and each second magnetic pole 15, the two second rotor slots 16 are inclined to each other, the spacing between the two second rotor slots 16 gradually increases from inside to outside along the radial direction of the rotor core 1, the two second rotor slots 16 form a slot group arranged in a "V" shape, and eight slot groups are uniformly distributed along the circumferential direction of the rotor core 1, so that each magnetic pole has a slot group, and each slot group is located between two adjacent first rotor slots 13.

[0054] Specifically, the second rotor slot 16 is embedded with a second permanent magnet 200, the rotor core 1 has both the first rotor slot 13 extending along the radial direction of the rotor core 1 and the second rotor slot 16 arranged in a "V" shape, which makes full use of the space of the rotor core 1, improves the space utilization of the rotor core 1, and is easier to realize high power density of the motor, while improving the air gap flux waveform and helping to improve the performance of the motor.

[0055] In a further embodiment, a connecting portion is formed between every two adjacent first cooling channels 12, each connecting portion is located in the first magnetic pole 14, or each connecting portion is located in the second magnetic pole 15.

[0056] Specifically, the interval region between every two adjacent first cooling channels 12 in the rotor core 1 forms a connecting portion, and all connecting portions are located in the same magnetic pole, for example, all connecting portions are located in the second magnetic pole 15, or all connecting portions are located in the first magnetic pole 14.

[0057] Exemplarily, as shown in Figure 1 and Figure 2 , the first cooling channel 12 has four, four first cooling channels 12 are uniformly distributed along the circumferential direction of the rotor core 1 around the center axis of the rotor core 1, forming four connecting portions, and each second magnetic pole 15 has a connecting portion.

[0058] In this embodiment, by arranging each connecting portion in the first magnetic pole 14 or each connecting portion in the second magnetic pole 15, the magnetic flux path formed between adjacent first magnetic pole 14 and second magnetic pole 15 is avoided, the magnetic leakage of the motor rotor is reduced, the efficiency and temperature rise of the motor are avoided, and the stability and reliability of the motor are improved.

[0059] In a further embodiment, two ends of each second rotor slot 16 in the extending direction are respectively provided with air slots 161.

[0060] As shown in Figure 1 and Figure 2 , two ends of each second rotor slot 16 are provided with air slots 161, and the air slots 161 penetrate the rotor core 1 in the axial direction of the rotor core 1.

[0061] In this embodiment, by providing the air slots 161, the magnetic circuit structure can be improved, and the leakage magnetic flux formed by the second permanent magnets 200 in the second rotor slots 16 can be reduced.

[0062] Further, the width of the two air slots 161 of each second rotor slot 16 gradually decreases towards the side away from the other air slot 161.

[0063] Exemplarily, the air slots 161 are semicircular, triangular, semioval, etc., and the width of each air slot 161 gradually decreases in the direction from the center of the second rotor slot 16 to the end.

[0064] As shown in Figure 1 and Figure 2 , the cross-sectional profile shape of the air slots 161 is triangular, and each air slot 161 gradually narrows towards the direction away from the other air slot 161, which improves the magnetic circuit structure and at the same time plays a certain limiting role for the second permanent magnets 200 in the second rotor slots 16, preventing the second permanent magnets 200 from moving in the extending direction of the second rotor slots 16 and affecting the installation strength of the second permanent magnets 200.

[0065] In an embodiment, each first magnetic pole 14 and second magnetic pole 15 is provided with a second cooling channel 17, the second cooling channel 17 penetrates the rotor core 1 in the axial direction of the rotor core 1, and the second cooling channel 17 is arranged on the side of the second rotor slot 16 away from the rotor shaft cavity 11 and between two adjacent second rotor slots 16.

[0066] As shown in Figure 1 , there are eight second cooling channels 17, and each first magnetic pole 14 and second magnetic pole 15 has one second cooling channel 17.

[0067] The second cooling channel 17 is close to the outer side wall of the rotor core 1 and between the two second rotor slots 16 of the magnetic pole, and the second cooling channel 17 is used for flowing cooling medium, and the cooling medium flows in the second cooling channel 17 in the axial direction of the rotor core 1, which cools the rotor core 1 and at the same time cools the second permanent magnets 200 in the second rotor slots 16, preventing the second permanent magnets 200 from demagnetizing due to excessive temperature.

[0068] Optionally, the second cooling channel 17 is in communication with two second rotor slots 16 in the magnetic pole where the second cooling channel 17 is located, so that the cooling medium flowing in the second cooling channel 17 directly contacts the second permanent magnet 200 in the second rotor slot 16, thereby improving the cooling effect on the second permanent magnet 200.

[0069] Optionally, a plurality of second cooling channels 17 are arranged in each of the first magnetic pole 14 and the second magnetic pole 15, thereby improving the cooling effect on the rotor core 1 and the second permanent magnet 200.

[0070] Optionally, the cross-sectional profile shape of the second cooling channel 17 is circular, oval, rectangular, or other polygonal shape, which is not limited in the present application. For example, as shown in Figure 1 the cross-sectional profile shape of the second cooling channel 17 is circular.

[0071] Optionally, the second cooling channel 17 is arranged on the side of the two second rotor slots 16 in the magnetic pole close to the rotor shaft cavity 11.

[0072] In one embodiment, the rotor core 1 further has a third cooling channel 18 in communication with the first cooling channel 12, the third cooling channel 18 is located on the side of the first cooling channel 12 close to the second rotor slot 16, and the side wall of the third cooling channel 18 is convex to the side of the second rotor slot 16.

[0073] As shown in Figure 2 the third cooling channel 18 is located in the middle of the first cooling channel 12 and between two adjacent first rotor slots 13, the third cooling channel 18 is convex to the two second rotor slots 16 in the magnetic pole, and the cross-sectional profile shape of the third cooling channel 18 can be sector, rectangular, triangular, circular, oval, or other shape, which is not limited in the present application. For example, as shown in Figure 2 the side wall of the third cooling channel 18 is arc-shaped and convex to the side of the second rotor slot 16.

[0074] The third cooling channel 18 is used for flowing of the cooling medium, the cooling medium flows in the third cooling channel 18 along the axial direction of the rotor core 1, thereby cooling the rotor core 1 and at the same time cooling the second permanent magnet 200 in the second rotor slot 16, thereby preventing the risk of demagnetization of the second permanent magnet 200 due to excessive temperature.

[0075] By arranging the third cooling channel 18 in communication with the first cooling channel 12, the rotor core 1 and the second permanent magnet 200 can be cooled, and at the same time, the structure is simple and reliable, and convenient for processing and manufacturing.

[0076] This application embodiment also provides a motor rotor, which includes a rotor shaft, a first permanent magnet 100 and a rotor core 1 provided in any of the above embodiments. The rotor shaft is inserted into the rotor shaft cavity 11, and the first permanent magnet 100 is embedded in the first rotor slot 13.

[0077] For example, such as Figure 1 As shown, the first rotor slot 13 extends radially along the rotor core 1, and the cross-sectional outline of the first rotor slot 13 is approximately rectangular. The embedded first permanent magnet 100 is embedded in the first rotor slot 13, and the shape and size of the first rotor slot 13 are adapted to the shape and size of the first permanent magnet 100.

[0078] By setting the first rotor slot 13 to extend radially along the rotor core 1, and the first permanent magnet 100 embedded in the first rotor slot 13, the magnetic flux in the rotor core 1 can be enhanced, which helps to improve the power density of the motor.

[0079] The motor rotor provided in this application embodiment has each first cooling channel 12 located between the rotor shaft cavity 11 and the first rotor slot 13, and each first rotor slot 13 connected to the first cooling channel 12. This allows the coolant flowing in the first cooling channel 12 to directly contact and exchange heat with the first permanent magnet 100 in the first rotor slot 13, thereby cooling the first permanent magnet 100 and preventing the risk of demagnetization due to excessive temperature. This helps to improve the performance of the motor.

[0080] In a further embodiment, the rotor core 1 includes first magnetic poles 14 and second magnetic poles 15 of opposite polarity that are alternately distributed along its circumference, and a first rotor slot 13 is provided between every two adjacent first magnetic poles 14 and second magnetic poles 15; the rotor core 1 also has a plurality of spaced second rotor slots 16, and each magnetic pole has two second rotor slots 16 arranged in a V-shape.

[0081] Specifically, a second permanent magnet 200 is embedded in the second rotor slot 16. The rotor core 1 has both a first rotor slot 13 extending radially and a second rotor slot 16 arranged in a "V" shape. This makes full use of the space of the rotor core 1, improves the space utilization rate of the rotor core 1, and makes it easier to achieve high power density of the motor. At the same time, it improves the air gap magnetic flux density waveform, which helps to improve the performance of the motor.

[0082] This application also provides a motor, including the motor rotor provided in any of the above embodiments.

[0083] This application also provides a vehicle, including the motor provided in the above embodiments. Exemplarily, the vehicle is a new energy vehicle such as an electric vehicle or a hybrid vehicle.

[0084] In the present application, the terms "first", "second" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or a specific order of limiting the indicated technical features. Thus, features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0085] It should be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms, unless the context clearly indicates otherwise.

[0086] The terms "include" and "contain" indicate the presence of the described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0087] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0088] Other embodiments of the present application will be readily apparent to those skilled in the art upon considering the specification and practicing the present application as disclosed herein. The present application is intended to cover any variations, uses or adaptive changes of the present application following the general principles of the present application and including common knowledge or conventional techniques in the art which are not disclosed by the present application. The specification and examples are only considered as exemplary.

[0089] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotor core (1) characterized in that, The rotor core (1) is provided with a rotor shaft cavity (11), a plurality of first cooling channels (12) and a plurality of first rotor slots (13), the rotor shaft cavity (11), the first cooling channels (12) and the first rotor slots (13) all penetrate the rotor core (1) along the axial direction of the rotor core (1), the plurality of first rotor slots (13) and the plurality of first cooling channels (12) are respectively distributed along the circumferential direction of the rotor core (1), each first cooling channel (12) is located between the rotor shaft cavity (11) and the first rotor slot (13), and each first rotor slot (13) is in communication with the first cooling channel (12); the rotor core (1) comprises first magnetic poles (14) and second magnetic poles (15) with opposite polarities and alternatingly distributed along the circumferential direction of the rotor core (1), and the first rotor slot (13) is arranged between every two adjacent first magnetic poles (14) and second magnetic poles (15). The rotor core (1) is further provided with a plurality of second rotor slots (16) distributed at intervals, and two V-shaped second rotor slots (16) are arranged in each of the first magnetic poles (14) and the second magnetic poles (15); a connecting portion is arranged between every two adjacent first cooling channels (12), and each connecting portion is located in the first magnetic pole (14) or the second magnetic pole (15). The rotor core (1) is further provided with a third cooling channel (18) in communication with the first cooling channel (12), the third cooling channel (18) is located on the side of the first cooling channel (12) close to the second rotor slot (16), and the side wall of the third cooling channel (18) is convex to the side where the second rotor slot (16) is located relative to the side wall of the first cooling channel (12).

2. The rotor core (1) according to claim 1, characterized in that Two air slots (161) are arranged at the two ends of each second rotor slot (16) in the extension direction.

3. The rotor core (1) according to claim 2, characterized in that The width of the two air slots (161) of each second rotor slot (16) gradually decreases towards the side away from each other.

4. The rotor core (1) according to claim 1, characterized in that A second cooling channel (17) is arranged in each of the first magnetic poles (14) and the second magnetic poles (15), the second cooling channel (17) penetrates the rotor core (1) along the axial direction of the rotor core (1), and the second cooling channel (17) is arranged on the side of the second rotor slot (16) away from the rotor shaft cavity (11) and between two adjacent second rotor slots (16).

5. An electric machine rotor, characterized in that The motor rotor comprises a rotor shaft, a first permanent magnet (100) and the rotor core (1) of any one of claims 1 to 4, the rotor shaft is inserted into the rotor shaft cavity (11), and the first permanent magnet (100) is embedded in the first rotor slot (13).

6. An electric machine characterized by The motor comprises the motor rotor of claim 5.

7. An automobile characterized by comprising: The automobile comprises the motor of claim 6. The automobile comprises the motor of claim 6.

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