Rotor assembly, motor and vehicle

Abstract

The present application provides a rotor assembly, a motor and a vehicle, belonging to the field of vehicle technology. The rotor assembly includes: a rotor core, a permanent magnet and a plurality of through bolts; the rotor core includes a plurality of rotor punchings arranged axially in layers, each rotor punching is provided with a plurality of first rotor slots and a plurality of second rotor slots, each first rotor slot extends radially of the rotor core, and each second rotor slot extends tangentially of the rotor core; the first rotor slot and the second rotor slot are arranged alternately along the circumference of the rotor core; the permanent magnet includes a plurality of first permanent magnets and a plurality of second permanent magnets, the first permanent magnet is located in the first rotor slot and magnetized tangentially of the rotor core, the second permanent magnet is located in the second rotor slot and magnetized radially of the rotor core; a plurality of through bolts penetrate the rotor core axially. The rotor assembly of the present application can effectively reduce the influence of centrifugal force on the rotor assembly, and it is easier to achieve high speed and high power density of the rotor assembly.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a rotor assembly, a motor and a vehicle. Background Art

[0002] With the rapid development of electric vehicles, the demand for the speed and power density of automotive drive motors is getting higher and higher. Tangential permanent magnet synchronous motors are easy to achieve high power density due to the "magnetic concentration" effect, but tangential permanent magnet synchronous motors have magnetic leakage at the ends of permanent magnets, which will have a certain impact on the power density.

[0003] In the related art, in order to improve the power density of the tangential permanent magnet synchronous motor, a rotor magnetic isolation bridge is generally set around each permanent magnet, and the shape complexity of the rotor magnetic isolation bridge is increased as much as possible to increase the length of the magnetic isolation path, thereby reducing the leakage flux at the end of the permanent magnet. However, the complex shape of the magnetic isolation bridge also increases the difficulty of rotor processing, resulting in higher manufacturing costs. Summary of the invention

[0004] The present application provides a rotor assembly, a motor and a vehicle, which can solve the problem that the magnetic isolation bridge increases the difficulty of machining the rotor, resulting in high manufacturing costs.

[0005] The technical solution is as follows:

[0006] In one aspect, a rotor assembly is provided, the rotor assembly comprising: a rotor core, a permanent magnet, and a plurality of through-bolts;

[0007] The rotor core comprises a plurality of rotor punchings arranged in an axially stacked manner, each of the rotor punchings is provided with a plurality of first rotor slots and a plurality of second rotor slots, each of the first rotor slots extends in a radial direction of the rotor core, and each of the second rotor slots extends in a tangential direction of the rotor core;

[0008] The first rotor slots and the second rotor slots are alternately arranged along the circumferential direction of the rotor core;

[0009] The permanent magnets include a plurality of first permanent magnets and a plurality of second permanent magnets, wherein the first permanent magnets are located in the first rotor slots and magnetized along the tangential direction of the rotor core, and the second permanent magnets are located in the second rotor slots and magnetized along the radial direction of the rotor core;

[0010] The plurality of penetration bolts penetrate the rotor core in the axial direction.

[0011] In some embodiments, each of the rotor punching sheets is provided with a plurality of through holes, and each of the through holes is located between two adjacent first rotor slots.

[0012] In some embodiments, the through hole is located on a side of the second rotor slot facing the axis of the rotor core, and / or the through hole is located on a side of the second rotor slot facing away from the axis of the rotor core.

[0013] In some embodiments, the rotor assembly further includes a front end plate and a rear end plate, wherein the front end plate and the rear end plate are respectively located at two axial ends of the rotor core and are respectively connected to the through bolts.

[0014] In some embodiments, the second rotor slot is at least one of a straight shape and a V-shape.

[0015] In some embodiments, when the second rotor slot is V-shaped and a through hole is provided on the rotor punching, the symmetry axis of the second rotor slot and at least one of the through holes are located on the same radial line of the rotor punching.

[0016] In some embodiments, the opening of the second rotor slot faces the axis of the rotor punching sheet, and the through hole is located on a side of the second rotor slot facing the axis of the rotor punching sheet.

[0017] In some embodiments, the opening of the second rotor slot faces the axis of the rotor punching sheet, and the through hole is located on a side of the second rotor slot facing away from the axis of the rotor punching sheet.

[0018] On the other hand, an electric machine is provided, comprising the rotor assembly described in the present application.

[0019] In another aspect, a vehicle is provided, comprising the motor described in the present application.

[0020] The beneficial effects of the technical solution provided by this application include at least:

[0021] The rotor assembly of the present application adopts a magnetic circuit structure that is a mixture of a radial permanent magnet rotor and a tangential permanent magnet rotor, and utilizes through-bolts to connect an axially extending rotor core, which can share the centrifugal force generated when the rotor core rotates at high speed, and is beneficial to improving the structural strength of the rotor assembly, thereby effectively reducing the impact of the centrifugal force caused by excessively high rotation speed on the rotor assembly, and making it easier to achieve high speed and high power density of the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1is a structural exploded view of a rotor assembly provided in an embodiment of the present application;

[0024] Figure 2 is a schematic diagram of the structure of the rotor punching provided in an embodiment of the present application;

[0025] Figure 3 It is a schematic diagram of the matching state of the rotor punching and the permanent magnet provided in the embodiment of the present application;

[0026] Figure 4 is a schematic structural diagram of a rotor punching provided by another embodiment of the present application;

[0027] Figure 5 is a schematic structural diagram of a rotor punching provided by another embodiment of the present application;

[0028] Figure 6 This is a simulation effect diagram of magnetic lines of force of a rotor core provided in an embodiment of the present application;

[0029] Figure 7 This is a simulation effect diagram of magnetic lines of force when the through-holes are removed from the rotor core provided in an embodiment of the present application.

[0030] The reference numerals in the figures represent respectively:

[0031] 1. Rotor core;

[0032] 11. rotor punching sheet; 111. first rotor slot; 1111. first air slot; 112. second rotor slot; 1121. second air slot; 113. penetration hole; 114. weight reduction hole;

[0033] 12. First rotating shaft hole;

[0034] 2. Permanent magnet;

[0035] 21. a first permanent magnet; 22. a second permanent magnet;

[0036] 3. Connecting bolts;

[0037] 31. Long-stem bolt; 32. Fastening nut;

[0038] 4. Front end panel;

[0039] 41. Second rotating shaft hole;

[0040] 5. Rear end plate;

[0041] 51. The third rotating shaft hole. DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] It should be understood that in the present application, "connection" and "connected" may refer to a mechanical connection relationship or a physical connection relationship, that is, A and B are connected or A and B are connected may mean that there are fastening components (such as screws, bolts, rivets, etc.) between A and B, or A and B are in contact with each other and A and B are difficult to separate.

[0045] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art.

[0046] Among them, leakage flux: In a permanent magnet motor, according to the specified magnetic circuit, the magnetic lines of force emitted by the N pole of a permanent magnet will be emitted to the S pole of the adjacent permanent magnet, but due to the existence of the magnetic isolation bridge, a small part of the magnetic lines of force emitted by the permanent magnet will pass through the magnetic isolation bridge and be emitted to other areas of the rotor punching, rather than to the S pole of the adjacent permanent magnet, thus forming leakage flux. The end of the permanent magnet is prone to leakage flux, and its leakage flux path is: the magnetic lines of force emitted by the N pole of the permanent magnet are emitted to its own S pole through the magnetic isolation bridge.

[0047] In the related art, when rotating at high speed, the rotor core will be subjected to huge centrifugal force. For example, when the speed exceeds 24,000 rpm, the centrifugal force generated by the rotor core will exert great pressure on its own structure, resulting in increased local internal stress of the rotor core, which is prone to convex pieces, falling pieces, or even breakage and damage, affecting the normal operation of the motor.

[0048] Therefore, the present application provides a rotor assembly that can effectively reduce the impact of centrifugal force caused by excessively high rotation speed on the rotor assembly, making it easier to achieve high speed and high power density of the rotor assembly.

[0049] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0050] On the one hand, combined with Figure 1 and Figure 2 As shown, this embodiment provides a rotor assembly, which includes: a rotor core 1, a permanent magnet 2 and a plurality of through-bolts 3.

[0051] The rotor core 1 includes a plurality of rotor punchings 11 arranged axially stacked, each rotor punching 11 is provided with a plurality of first rotor slots 111 and a plurality of second rotor slots 112, each first rotor slot 111 extends in the radial direction of the rotor core 1, and each second rotor slot 112 extends in the tangential direction of the rotor core 1; the first rotor slots 111 and the second rotor slots 112 are alternately arranged in the circumferential direction of the rotor core 1.

[0052] The permanent magnet 2 includes a plurality of first permanent magnets 21 and a plurality of second permanent magnets 22. The first permanent magnets 21 are located in the first rotor slots 111 and magnetized along the tangential direction of the rotor core 1. The second permanent magnets 22 are located in the second rotor slots 112 and magnetized along the radial direction of the rotor core 1. A plurality of through bolts 3 penetrate the rotor core 1 in the axial direction.

[0053] The rotor assembly of this embodiment adopts a magnetic circuit structure that is a mixture of a radial permanent magnet rotor and a tangential permanent magnet rotor, and uses a through bolt 3 to connect the axially penetrating rotor core 1, which can share the centrifugal force generated when the rotor core 1 rotates at a high speed, which is beneficial to improving the structural strength of the rotor assembly, thereby effectively reducing the influence of the centrifugal force caused by the excessively high speed on the rotor assembly, and making it easier to achieve high speed and high power density of the rotor assembly.

[0054] In some possible implementations, the rotor punching sheet 11 is silicon steel or cold-rolled sheet. Among them, the main components of the silicon steel sheet include silicon, iron and a small amount of carbon, manganese and other elements, and have the characteristics of low magnetic permeability, high resistivity and low residual magnetic flux, which can effectively reduce the hysteresis loss and eddy current loss of the rotor core 1 and improve the magnetic flux conduction performance. The cold-rolled sheet has high hardness and strength, good plasticity and toughness, and can meet the manufacturing requirements of core punching sheets of different sizes and shapes.

[0055] Exemplarily, the permanent magnet 2 includes but is not limited to aluminum nickel cobalt permanent magnet (AlNiCo), iron chromium cobalt permanent magnet (FeCrCo), strontium ferrite permanent magnet (SrFeO), barium ferrite permanent magnet (BaFeO), neodymium iron boron permanent magnet (NdFeB) and samarium cobalt permanent magnet (SmCo) and the like.

[0056] In some possible implementations, reference Figures 2 to 5 As shown, one end of the first rotor slot 111 extends to the outer peripheral wall of the rotor punching 11, so that the radial length of the first rotor slot 111 along the rotor core 1 is greater than the radial length of the first permanent magnet 21 along the rotor core 1, then a first air slot 1111 is formed between the outer peripheral wall of the rotor punching 11 and the first permanent magnet 21, which can be used to improve the magnetic resistance on the leakage magnetic path of the first permanent magnet 21, so that the leakage magnetic path at the end of the first permanent magnet 21 is not connected with magnetic conductive material, thereby reducing the leakage magnetic flux formed by the end of the first permanent magnet 21 through the rotor punching 11.

[0057] Among them, the first air groove 1111 is a part of the first rotor slot 111, and the width of this part along the tangent direction of the rotor core 1 is smaller than the width of the part of the first rotor slot 111 used to install the first permanent magnet 21 along the tangent direction of the rotor core 1, so as to provide radial limitation for the first permanent magnet 21 and ensure that the first permanent magnet 21 will not move in the first rotor slot 111 under the action of centrifugal force when the rotor core 1 rotates.

[0058] In some possible implementations, reference Figures 2 to 5 As shown, the tangential length of the second rotor slot 112 along the rotor core 1 is greater than the tangential length of the second permanent magnet 22 along the rotor core 1. When the second permanent magnet 22 is located in the second rotor slot 112, the second rotor slot 112 has two second air slots 1121 at both ends along the tangential direction. The second air slots 1121 can increase the magnetic resistance on the leakage magnetic path of the second permanent magnet 22, thereby reducing the leakage magnetic flux formed at the end of the first permanent magnet 21 through the rotor punching 11.

[0059] In some other possible implementations, the first permanent magnet 21 and the first rotor slot 111 are bonded and connected with glue to improve the connection strength between the first permanent magnet 21 and the first rotor slot 111 .

[0060] The second permanent magnet 22 and the second rotor slot 112 are bonded and connected by glue, so as to improve the connection strength between the second permanent magnet 22 and the second rotor slot 112 .

[0061] In some possible implementations, the through-bolt 3 includes a long-rod bolt 31 and a fastening nut 32. The long-rod bolt 31 is axially penetrated into the rotor core 1, and the fastening nut 32 is threadedly connected to the end of the long-rod bolt 31 to achieve axial compression and fixation of the rotor core 1.

[0062] Exemplarily, the number of the penetration bolts 3 is, for example, two, three, four, etc., and the plurality of penetration bolts 3 are evenly spaced apart along the circumference of the rotor core 1 .

[0063] Combination Figures 2 to 5As shown, in some embodiments, each rotor punching sheet 11 is respectively provided with a plurality of through holes 113 , and each through hole 113 is respectively located between two adjacent first rotor slots 111 .

[0064] Through the above arrangement, the through bolt 3 can be connected to each rotor punching 11 through the through hole 113 to provide fixed support for each rotor punching 11. The through hole 113 is located between two adjacent first rotor slots 111, which will not cause loss of structural strength of the rotor punching 11, and the through hole 113 will not interfere with the distribution of magnetic lines of force in the rotor punching 11, thereby ensuring the working performance of the rotor punching 11.

[0065] For example, the number of the through holes 113 may be one, two, three, etc.

[0066] refer to Figure 6 and Figure 7 As shown, Figure 6 The figure shows the distribution of magnetic lines of force of the rotor core 1 provided in the embodiment of the present application. Figure 7 The figure shows the distribution of magnetic lines of force in the rotor core 1 provided in the embodiment of the present application without the through holes. It can be seen from the figure that the arrangement of the through holes 113 has basically no effect on the distribution of magnetic lines of force in the rotor core 1.

[0067] Combination Figures 2 to 5 As shown, in some embodiments, the through hole 113 is located on a side of the second rotor slot 112 facing the axis of the rotor core 1 , and / or the through hole 113 is located on a side of the second rotor slot 112 facing away from the axis of the rotor core 1 .

[0068] Through the above arrangement, the through holes 113 can be located on the inner and outer sides of the second rotor slot 112, which can provide fixed support for the rotor punching without interfering with the magnetic lines in the rotor punching sheet 11, thereby ensuring the working performance of the rotor punching sheet 11.

[0069] Exemplarily, the through hole 113 is located on the side of the second rotor slot 112 away from the axis of the rotor core 1, that is, the through hole 113 is located on the outside of the second rotor slot 112. During the high-speed rotation of the rotor core 1, the second permanent magnet 22 in the second rotor slot 112 is squeezed against the outside of the second rotor slot 112 under the action of centrifugal force. The through bolt 3 in the through hole 113 can provide support force to the rotor punching 11 on the outside of the second rotor slot 112, offset the centrifugal force on the second rotor slot 112, and thus help to improve the structural strength of the rotor punching 11 on the outside of the second rotor slot 112.

[0070] Combination Figure 1As shown, in some embodiments, the rotor assembly further includes a front end plate 4 and a rear end plate 5, which are respectively located at two axial ends of the rotor core 1 and are respectively connected to the through bolts 3.

[0071] Through the above arrangement, the axial ends of the rotor assembly are axially crimped and fixed by the front end plate 4 and the rear end plate 5 respectively. The front end plate 4 and the rear end plate 5 can axially limit the first permanent magnet 21 axially inserted in the first rotor slot 111 and the second permanent magnet 22 axially inserted in the second rotor slot 112.

[0072] In some possible implementations, reference Figure 1 and Figure 2 As shown, the rotor core 1 is provided with a first shaft hole 12, the first shaft hole 12 is located on the axis of the rotor punching 11, the front end plate 4 is provided with a second shaft hole 41, and the rear end plate 5 is provided with a third shaft hole 51. The second shaft hole 41, the first shaft hole 12 and the third shaft hole 51 are coaxially arranged in sequence for the rotor shaft to pass through.

[0073] In some embodiments, the second rotor slot 112 is at least one of a straight shape and a V shape. The use of the second rotor slot 112 and the second permanent magnet 22 corresponding to the second rotor slot 112 is conducive to improving the power density of the rotor assembly.

[0074] Combination Figure 4 and Figure 5 As shown, in some embodiments, when the second rotor slot 112 is V-shaped and a through hole 113 is provided on the rotor punching 11 , the symmetry axis of the second rotor slot 112 and at least one through hole 113 are located on the same radial line of the rotor punching 11 .

[0075] Through the above arrangement, the through hole 113 is arranged on the symmetry axis of the second rotor slot 112 , the second permanent magnet 22 in the second rotor slot 112 has fewer magnetic lines of force at the symmetry axis, and the through hole 113 will not interfere with the distribution of the magnetic lines of force.

[0076] Combination Figure 4 As shown, in some embodiments, the opening of the second rotor slot 112 faces the axis of the rotor punching 11 , and the through hole 113 is located on the side of the second rotor slot 112 facing the axis of the rotor punching 11 .

[0077] Through the above arrangement, the through hole 113 can provide structural support for the rotor punching 11 where the second rotor slot 112 is located, and will not affect the distribution of magnetic lines of force of the second permanent magnet 22 .

[0078] Combination Figure 5As shown, in some embodiments, the opening of the second rotor slot 112 faces the axis of the rotor punching 11 , and the through hole 113 is located on the side of the second rotor slot 112 facing away from the axis of the rotor punching 11 .

[0079] Through the above arrangement, the through hole 113 can provide structural support for the rotor punching 11 where the second rotor slot 112 is located, and will not affect the distribution of magnetic lines of force of the second permanent magnet 22 .

[0080] In addition, the permanent magnet motor can operate in both the motor state and the generator state. In particular, when it is in the motor state, the rotor shaft needs to be connected to the driven shaft of the mechanism to be driven (such as the input shaft of the automobile gearbox) and transmit the torque to the mechanism to be driven. If the rotor core 1 is heavy, more energy will be consumed when the torque is transmitted through the rotor core 1, resulting in reduced energy utilization.

[0081] Therefore, under the premise of satisfying the structural strength, in some embodiments of the present application, Figures 2 to 5 As shown, the rotor punching 11 is provided with a plurality of weight-reducing holes 114, which are distributed at intervals along the annular direction of the rotor punching 11, and each weight-reducing hole 114 penetrates the rotor punching 11 axially. The weight-reducing hole 114 is located at one end of the first rotor slot 111 facing the axis of the rotor core 1, and is spaced apart from the first rotor slot 111.

[0082] Through the above arrangement, the weight-reducing holes 114 can reduce the weight of the rotor punching 11, reduce the inertia moment of the rotor assembly, improve the dynamic response speed and acceleration of the motor, make the motor easier to start and stop, and improve the efficiency and controllability of the permanent magnet motor.

[0083] Secondly, when the motor is running, electrical energy will be converted into mechanical energy, but this process is not 100% efficient, and some of the electrical energy will be converted into heat energy. If this heat cannot be taken away in time, the temperature of the motor will gradually rise. Excessive temperature will damage the insulation material of the motor, shorten the service life of the motor, and in serious cases, it will cause the parts of the motor to burn out and even cause a fire.

[0084] Furthermore, in order to avoid the above-mentioned problems, the multiple weight-reducing holes 114 can not only be used to reduce the weight of the rotor core 1, but can also be used to form multiple coolant channels respectively. By injecting circulating coolant into these coolant channels, the rotor punchings 11 can be cooled so that they can operate within a relatively ideal temperature range.

[0085] In some embodiments, the hole shape of the weight-reducing hole 114 can be any one or a combination of rectangular holes, circular holes, trapezoidal holes and elliptical holes. Those skilled in the art can select and adjust the shape of the weight-reducing hole 114 according to actual needs and processing difficulty.

[0086] Exemplarily, the shape of the weight-reducing hole 114 is a trapezoidal shape with both the upper and lower bottoms being arc-shaped, the upper bottom being close to the center of the rotor punching 11, wherein the arc line of the arc is parallel to the circumference of the rotor punching 11. The coolant channel formed by the weight-reducing hole 114 of this shape enables the coolant to contact the magnetic isolation part more directly and over a larger area, thereby improving the cooling efficiency; since the upper bottom of the trapezoidal design is concave, the pressure of the coolant on the magnetic isolation part can be dispersed, thereby preventing the magnetic isolation part from being damaged by excessive pressure.

[0087] In order to ensure that the position of the weight reduction hole 114 still has a high structural strength, in some embodiments of the present application, along the circumference of the rotor core 1, each weight reduction hole 114 is aligned with a first rotor slot 111, and the symmetry line of the weight reduction hole 114 and the symmetry line of the first rotor slot 111 are located on the same radial line of the rotor punching 11.

[0088] In some embodiments, the rotor core 1 also includes a sleeve, which is mounted on the outside of the rotor punching 11 to share the centrifugal force generated when the rotor punching 11 rotates at high speed, thereby enhancing the structural strength of the rotor core 1, so that the permanent magnet motor using the rotor core 1 can adapt to high-speed working conditions.

[0089] On the other hand, this embodiment provides a motor, which includes the rotor assembly of the present application.

[0090] The motor of this embodiment adopts the rotor assembly of the present application and has all the beneficial technical effects of all the embodiments in this document.

[0091] Among them, a magnetic circuit structure that mixes radial permanent magnet rotors and tangential permanent magnet rotors is adopted, and the rotor core 1 is axially connected by a through-bolt 3. This can share the centrifugal force generated when the rotor core 1 rotates at high speed, which is beneficial to improving the structural strength of the rotor assembly, thereby effectively reducing the influence of the centrifugal force caused by excessively high speed on the rotor assembly, and making it easier to achieve high speed and high power density of the rotor assembly.

[0092] On the other hand, the present embodiment provides a vehicle, and the vehicle includes the motor of the present application.

[0093] The vehicle of this embodiment adopts the motor of the present application and has all the beneficial technical effects of all the embodiments herein.

[0094] Among them, the motor adopts a magnetic circuit structure that is a mixture of a radial permanent magnet rotor and a tangential permanent magnet rotor, and uses a through-bolt 3 to connect the axially penetrating rotor core 1, which can share the centrifugal force generated when the rotor core 1 rotates at high speed, which is beneficial to improving the structural strength of the rotor assembly, thereby effectively reducing the impact of the centrifugal force caused by excessive speed on the rotor assembly, and making it easier to achieve high speed and high power density of the rotor assembly.

[0095] It should be noted that the "several" and "at least one" mentioned in this article refer to one or more, and "multiple" and "at least two" refer to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0096] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0097] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0098] In the description of this specification, the reference terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application.

[0099] The above description is only an embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor assembly, characterized in that: The rotor assembly comprises: a rotor core (1), a permanent magnet (2) and a plurality of through-bolts (3); The rotor core (1) comprises a plurality of rotor punchings (11) arranged in an axially stacked manner, each of the rotor punchings (11) respectively defines a plurality of first rotor slots (111) and a plurality of second rotor slots (112), each of the first rotor slots (111) extends in a radial direction of the rotor core (1), and each of the second rotor slots (112) extends in a tangential direction of the rotor core (1); The first rotor slots (111) and the second rotor slots (112) are alternately arranged along the circumferential direction of the rotor core (1); The permanent magnet (2) comprises a plurality of first permanent magnets (21) and a plurality of second permanent magnets (22), wherein the first permanent magnets (21) are located in the first rotor slots (111) and are magnetized in a tangential direction of the rotor core (1), and the second permanent magnets (22) are located in the second rotor slots (112) and are magnetized in a radial direction of the rotor core (1); The plurality of penetration bolts (3) penetrate the rotor core (1) in the axial direction.

2. The rotor assembly according to claim 1, characterized in that Each of the rotor punching sheets (11) is provided with a plurality of penetration holes (113), and each of the penetration holes (113) is located between two adjacent first rotor slots (111).

3. The rotor assembly according to claim 2, characterized in that: The through hole (113) is located on the side of the second rotor slot (112) facing the axis of the rotor core (1), and / or the through hole (113) is located on the side of the second rotor slot (112) facing away from the axis of the rotor core (1).

4. The rotor assembly according to claim 1, characterized in that: The rotor assembly further comprises a front end plate (4) and a rear end plate (5), wherein the front end plate (4) and the rear end plate (5) are respectively located at two axial ends of the rotor core (1) and are respectively connected to the through-bolts (3).

5. The rotor assembly according to any one of claims 1 to 4, characterized in that: The second rotor slot (112) is at least one of a straight shape and a V shape.

6. The rotor assembly according to claim 5, characterized in that When the second rotor slot (112) is V-shaped and a through hole (113) is provided on the rotor punching (11), the symmetry axis of the second rotor slot (112) and at least one of the through holes (113) are located on the same radial line of the rotor punching (11).

7. The rotor assembly according to claim 6, characterized in that The opening of the second rotor slot (112) faces the axis of the rotor punching sheet (11), and the through hole (113) is located on the side of the second rotor slot (112) facing the axis of the rotor punching sheet (11).

8. The rotor assembly according to claim 6, characterized in that The opening of the second rotor slot (112) faces the axis of the rotor punching sheet (11), and the through hole (113) is located on the side of the second rotor slot (112) facing away from the axis of the rotor punching sheet (11).

9. A motor, characterized in that: The electric machine comprises the rotor assembly according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle comprises the electric machine of claim 9.

Images