Motor rotor, motor having same, and vehicle

Abstract

A motor rotor (100) and a motor (1000) having same, the motor rotor (100) comprising: a rotor frame (10), the rotor frame (10) being provided with mounting holes (111) arranged in the circumferential direction of the motor rotor (100); and magnetic units (20), the magnetic units (20) being disposed in the mounting holes (111), at least one magnetic unit (20) comprising a plurality of magnets (21), and the plurality of magnets (21) being sequentially arranged and connected.

Description

Motor rotor, motor and vehicle with same

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 2024215764394, filed on July 04, 2024, the entire contents of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of motor manufacturing, in particular to a motor rotor and a motor with the same. BACKGROUND

[0004] In the existing motor rotor, the magnetic steel structure used in the motor rotor is mostly integrated. Since the eddy current loss of the magnet is directly related to the size of the magnet, the larger the size of the magnet, the more obvious the eddy current effect, the greater the eddy current loss, and the more serious the heat generation, thereby being not conducive to the operating efficiency of the motor.

[0005] SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a motor rotor which can ensure the operating efficiency of the motor.

[0007] The present application also proposes a motor with the above motor rotor.

[0008] The present application also proposes a vehicle with the above motor.

[0009] According to the motor rotor of the present application, the plurality of magnets are sequentially arranged and connected to form the magnetic unit, and the magnetic unit is arranged in the mounting hole of the rotor frame, so that the temperature rise of the magnetic unit can be reduced, thereby ensuring the operating efficiency of the rotor and saving the energy consumption of the rotor.

[0010] According to the motor rotor of the present application, the plurality of magnets are sequentially arranged and connected to form the magnetic unit, and the magnetic unit is arranged in the mounting hole of the rotor frame, so that the temperature rise of the magnetic unit can be reduced, thereby ensuring the operating efficiency of the rotor and saving the energy consumption of the rotor.

[0011] According to some embodiments of the present application, the plurality of magnets are arranged along the width direction of the magnetic unit; and / or, the plurality of magnets are arranged in layers along the thickness direction of the magnetic unit.

[0012] According to some embodiments of the present application, at least part of the plurality of magnets are connected by bonding.

[0013] According to some embodiments of the present application, at least part of the plurality of magnets are connected by structural adhesive.

[0014] According to some embodiments of the present application, in the arrangement direction of the plurality of magnets, the magnetic induction intensity of the magnets at both ends of the magnetic unit is greater than the magnetic induction intensity of the remaining magnets.

[0015] According to some embodiments of the present application, the number of mounting holes is a plurality, and the plurality of mounting holes are arranged at intervals, and each of the mounting holes is provided with the magnetic unit.

[0016] According to some embodiments of the present application, the plurality of mounting holes constitute at least one mounting group, and the mounting group is composed of a plurality of mounting holes adjacent in the circumferential direction of the motor rotor, and the plurality of mounting holes of the mounting group are arranged radially symmetrically about the motor rotor.

[0017] According to some embodiments of the present application, the plurality of mounting holes of the mounting group are arranged in at least one V-shaped structure opening towards the outer periphery of the rotor frame.

[0018] According to some embodiments of the present application, the mounting hole is provided with a plurality of magnetic units arranged in sequence along the axial direction of the motor rotor.

[0019] According to some embodiments of the present application, the rotor frame is provided with a weight-reducing hole.

[0020] The motor according to the second aspect of the present application comprises the motor rotor according to the first aspect of the present application.

[0021] According to the motor of the present application, the motor rotor according to the first aspect of the present application is provided, the plurality of magnets are arranged in sequence and connected to form a magnetic unit, and the magnetic unit is arranged in the mounting hole of the rotor frame, which can reduce the temperature rise of the magnetic unit, thereby ensuring the operating efficiency of the rotor and saving the energy consumption of the rotor.

[0022] The vehicle according to the third aspect of the present application comprises the motor according to the second aspect of the present application.

[0023] According to the vehicle of the present application, the motor according to the second aspect of the present application is provided, and the motor rotor according to the first aspect of the present application is provided on the motor, the plurality of magnets are arranged in sequence and connected to form a magnetic unit, and the magnetic unit is arranged in the mounting hole of the rotor frame, which can reduce the temperature rise of the magnetic unit, thereby ensuring the operating efficiency of the rotor and saving the energy consumption of the rotor.

[0024] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a schematic diagram of an electric machine according to an embodiment of the present application;

[0026] Fig. 2 is a schematic diagram of a rotor of an electric machine according to an embodiment of the present application;

[0027] Fig. 3 is an enlarged view of A in Fig. 2, wherein the plurality of magnets are arranged along a width direction of the magnetic cell;

[0028] Fig. 4 is a schematic diagram of the magnetic cell shown in Fig. 3, wherein the plurality of magnets have the same magnetic induction;

[0029] Fig. 5 is a schematic diagram of the magnetic cell shown in Fig. 3, wherein the plurality of magnets have different magnetic inductions;

[0030] Fig. 6 is a schematic diagram of a rotor of an electric machine according to another embodiment of the present application, wherein the plurality of magnets are arranged along a thickness direction of the magnetic cell;

[0031] Fig. 7 is a schematic diagram of the magnetic cell shown in Fig. 6, wherein the plurality of magnets have the same magnetic induction;

[0032] Fig. 8 is a schematic diagram of the magnetic cell shown in Fig. 6, wherein the plurality of magnets have different magnetic inductions;

[0033] Fig. 9 is a graph showing the relationship between the number of segments of the plurality of magnets and the eddy current loss;

[0034] Fig. 10 is a graph showing the steady-state temperature of the segmented magnetic cell and the non-segmented magnetic cell;

[0035] Fig. 11 is a schematic diagram of a vehicle.

[0036] Reference Signs: 100, rotor of an electric machine; 10, rotor holder; 11, mounting group; 111, mounting hole; 12, weight-reducing hole; 20, magnetic cell; 21, magnet; 200, stator; 1000, electric machine; 1, vehicle. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which like reference numerals refer to like elements or elements having the same function throughout the description of the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0038] A rotor of an electric machine according to an embodiment of the present application is described below with reference to Figs. 1-11.

[0039] Referring to Figs. 1, 2, 3, and 6, a rotor of an electric machine 100 according to an embodiment of the present application includes a rotor holder 10 and a plurality of magnetic cells 20.

[0040] In some embodiments, the rotor frame 10 has mounting holes 111 arranged along the circumference of the motor rotor 100; the magnetic unit 20 is arranged in the mounting slot, and the at least one magnetic unit 20 includes a plurality of magnets 21, that is, the magnetic unit 20 can include two, three, or four or more magnets 21, and the plurality of magnets 21 are arranged in sequence and connected.

[0041] It should be noted that the component capable of maintaining its magnetism for a long time is referred to as a magnet 21, and in some embodiments, the magnet 21 is a magnetic steel, which can ensure the magnetic induction intensity of the magnet 21, thereby ensuring the magnetic induction intensity of the magnet 21.

[0042] The motor rotor 100 of the present application can reduce the size of the single magnet 21 by arranging the plurality of magnets 21 in sequence and connecting them to form the magnetic unit 20 and arranging the magnetic unit 20 in the mounting hole 111 of the rotor frame 10. Compared with the prior art scheme in which the magnetic unit 20 is arranged as a whole, the magnetic unit 20 of the present application can effectively control the temperature rise of the magnetic unit 20 and reduce the eddy current loss of the magnetic unit 20, thereby ensuring the operating efficiency of the rotor, saving rotor energy consumption, and further ensuring the operating efficiency of the motor 1000, improving the use safety, and at the same time, even if the motor 1000 is operated under a variety of complex working conditions, such as self-heating, voltage boosting and charging, and high-speed operation of the motor 1000, etc. Working conditions will not cause high temperature of the magnetic unit 20, which can effectively prevent the high temperature demagnetization of the magnetic unit 20, thereby ensuring the service life of the magnetic unit 20, and further ensuring the service life of the motor 1000.

[0043] In addition, arranging the magnetic unit 20 as a plurality of magnets 21 can facilitate the assembly of the magnetic unit 20, facilitate the improvement of assembly efficiency, and at the same time, can increase the design freedom of the magnetic unit 20 and save mold cost.

[0044] According to the motor rotor 100 of the embodiments of the present application, by arranging the plurality of magnets 21 in sequence and connecting them to form the magnetic unit 20 and arranging the magnetic unit 20 in the mounting hole 111 of the rotor frame 10, the temperature rise of the magnetic unit 20 can be reduced, thereby ensuring the operating efficiency of the rotor and saving rotor energy consumption.

[0045] According to some embodiments of the present application, referring to FIGS. 3 and 4, the plurality of magnets 21 are arranged along the width direction of the magnetic unit 20. Thus, this arrangement can facilitate the bonding of the plurality of magnets 21, thereby improving the assembly efficiency of the magnets 21, and at the same time, the magnet 21 structure is simple and convenient to process, thereby improving the processing efficiency and saving production time.

[0046] For example, as shown in FIG. 3 and FIG. 4, the magnet 21 is a rectangular column extending along the axial direction of the motor rotor 100, and a plurality of magnets 21 are arranged along the X direction in FIG. 4, which is the width direction of the magnet 21. Preferably, when the size of the magnet 21 is less than or equal to 3 mm, the eddy current loss of the magnet 21 can be significantly reduced.

[0047] Further, as shown in FIG. 6 and FIG. 7, a plurality of magnets 21 are arranged in a stacked manner along the thickness direction of the magnetic unit 20. In this way, this arrangement can facilitate the bonding of a plurality of magnets 21, thereby improving the assembly efficiency of the magnet 21, while the structure of the magnet 21 is simple, facilitating processing, thereby improving the processing efficiency and saving production time.

[0048] For example, as shown in FIG. 6 and FIG. 7, the magnet 21 is a rectangular plate extending along the axial direction of the motor rotor 100, and a plurality of magnets 21 are arranged along the Y direction in FIG. 7, which is the thickness direction of the magnet 21. Preferably, the magnet 21 can be triangular, square or parallelogram, etc. In this way, the processing of the magnet 21 can be facilitated, and when the thickness size of the magnet 21 is less than or equal to 1.5 mm, the eddy current loss of the magnet 21 decreases significantly, thereby effectively reducing the temperature rise of the magnet 21.

[0049] As shown in FIG. 9, the horizontal axis in FIG. 9 is the number of segments, and the vertical axis in FIG. 9 is the eddy current loss percentage. Through simulation calculation, it is found that when the number of segments of the magnet 21 is 1, the eddy current loss is the highest, when the number of segments of the magnet 21 is 3, the eddy current loss is relatively low, and when the number of segments of the magnet 21 is greater than or equal to 3, the eddy current loss of the segmented magnet 21 tends to be flat. Therefore, when the magnet 21 is segmented into 3 segments, the eddy current reduction effect can be guaranteed, and the processing of the magnet 21 can be facilitated.

[0050] As shown in FIG. 10, the vertical axis in FIG. 10 is the steady-state temperature value, the left side in FIG. 10 is the steady-state temperature of the unsegmented magnet 21, and the right side in FIG. 10 is the steady-state temperature of the segmented magnet 21. It can be found from FIG. 10 that the steady-state temperature of the segmented magnet 21 is lower than that of the unsegmented magnet 21. Therefore, segmenting the magnet 21 into a plurality of magnets 21 can effectively reduce the steady-state temperature of the magnet 21, thereby ensuring the service life of the motor 1000.

[0051] According to some embodiments of the present application, referring to FIG. 3 and FIG. 6, at least part of the plurality of magnets 21 are bonded and connected, that is, part of the plurality of magnets 21 can be bonded and connected, or all of the plurality of magnets 21 can be bonded and connected. In this way, the bonding connection has a simple structure and low cost, is convenient for batch use, facilitates splicing and assembly, thereby improving the assembly efficiency, and the number of magnets 21 can be bonded according to actual needs, thereby improving the versatility of the magnetic unit 20.

[0052] According to some optional embodiments of the present application, referring to FIG. 3 and FIG. 6, at least part of the plurality of magnets 21 are connected by structural adhesive. Thus, the structural adhesive can ensure the bonding effect between the plurality of magnets 21, so as to effectively prevent the magnets 21 from separating.

[0053] In some embodiments, the structural adhesive is high-temperature-resistant non-conductive magnetic steel adhesive, so as to prevent the structural adhesive from losing adhesion after high temperature, thereby ensuring the bonding reliability of the structural adhesive, and also preventing the magnets 21 from short-circuiting with other structures of the motor 1000, thereby ensuring the use safety of the motor 1000.

[0054] According to some embodiments of the present application, referring to FIG. 5 and FIG. 8, in the arrangement direction of the plurality of magnets 21, the magnetic induction intensity of the magnets 21 located at both ends is greater than that of the remaining magnets 21. Thus, by arranging the magnets 21 with different intensities, the temperature rise of the magnets 21 can be further improved, thereby effectively preventing the magnets 21 from demagnetizing at high temperature, and further ensuring the service life of the magnets 21, and at the same time, this setting structure is reasonable, which can avoid irreversible demagnetization caused by the armature direct-axis magnetic motive force.

[0055] Through demagnetization simulation calculation, when using magnetic steel segments of different materials to bond into a whole segment of magnetic steel, the permanent magnet material with weaker magnetic performance is arranged in the middle segment to avoid irreversible demagnetization caused by the armature direct-axis magnetic motive force, and therefore, this design is reasonable and can further prevent the magnets 21 from demagnetizing.

[0056] In some embodiments, the material of the magnets 21 can be sintered neodymium iron boron, ferrite, samarium cobalt, and the like, as well as splicing combinations of permanent magnet materials of the same material but different grades.

[0057] According to some embodiments of the present application, referring to FIG. 2, FIG. 3 and FIG. 6, the number of mounting holes 111 is multiple, that is, the number of mounting holes 111 can be two, three or four or more, and the plurality of mounting holes 111 are arranged at intervals, and each mounting hole 111 is provided with a magnetic unit 20. Thus, the plurality of mounting holes 111 can be provided with the plurality of magnets 21, so as to ensure the magnetic induction intensity of each mounting area 101, and further ensure the operating power of the motor 1000.

[0058] According to some optional embodiments of the present application, referring to FIG. 2 and FIG. 3, the plurality of mounting holes 111 constitute at least one mounting group 11, the mounting group 11 is composed of a plurality of mounting holes 111 adjacent in the circumferential direction of the motor rotor, and the plurality of mounting holes 111 of the mounting group 11 are arranged in a V-shaped opening towards the outer periphery of the rotor frame 10. In the direction from the outer to the inner in the radial direction of the motor rotor 100, the two mounting holes 111 of the mounting group 11 are arranged symmetrically about the radial direction of the motor rotor 100.

[0059] In this way, the multiple installation groups 11 are arranged in a reasonable manner, which is convenient for arrangement and can ensure the magnetic induction intensity of the installation group 11, and can save the space occupied by the installation hole 111 in the radial direction of the motor rotor 100. In addition, the single installation group 11 forms a V-shaped structure, and the V-shaped structure design allows the magnets 21 to be arranged at a specific angle and sequence, so that the space can be used more effectively, the magnetic flux path is increased, and the magnetic flux density and output torque of the motor 1000 can be improved.

[0060] According to some optional embodiments of the present application, referring to FIGS. 2 and 3, the multiple installation holes 111 of the installation group 11 are arranged in at least one V-shaped structure opening towards the outer circumferential edge of the rotor frame 10, that is, the multiple installation holes 111 of the installation group 11 can be arranged in one, two or more V-shaped structures opening towards the outer circumferential edge of the rotor frame 10.

[0061] In some embodiments, the installation group 11 is composed of four installation holes 111, two of which are first installation holes and the other two are second installation holes, wherein the two first installation holes are arranged symmetrically about the radial direction of the motor rotor 100 and arranged in a V-shaped structure opening towards the outer circumferential edge of the rotor frame 10, the two second installation holes are arranged symmetrically about the radial direction of the motor rotor 100 and arranged in a V-shaped structure opening towards the outer circumferential edge of the rotor frame 10, and the two second installation holes are arranged on one side of the two first installation holes opening towards the outer circumferential edge of the rotor frame 10.

[0062] In this way, by arranging the installation group 11 in two V-shaped structures, the magnetic induction intensity of the installation group 11 can be further ensured, so that the operating power of the motor 1000 can be ensured, and better mechanical fixation can be provided to prevent the magnets 21 from being displaced or falling off when rotating at high speed or being subjected to external impact, thereby increasing the stability and reliability of the motor rotor 100. In addition, the airflow channel inside the motor rotor 100 can be improved, which is helpful for heat dissipation and effectively prevents the motor 1000 from rising in temperature, thereby effectively prolonging the service life of the motor 1000.

[0063] According to some embodiments of the present application, referring to FIGS. 1 and 2, the installation hole 111 is provided with multiple magnetic units 21 arranged in sequence along the axial direction of the motor rotor 100, and the magnetic unit 21 includes multiple magnetic segments, that is, the magnetic unit 21 can include two, three or more magnetic segments, and the multiple magnetic segments are arranged along the axial direction of the motor rotor 100. In this way, by segmenting the magnetic unit 21, the temperature rise of the magnet 21 can be further reduced, thereby further ensuring the efficiency of the motor 1000.

[0064] It should be noted that simulation calculation can show that the efficiency of the motor 1000 can be effectively improved by about 0.41% by using the segmented magnet 21 structure, and the steady-state temperature of the segmented permanent magnet is 27℃ lower than that of the non-segmented magnet 21.

[0065] According to some embodiments of the present application, referring to FIGS. 1 and 2, the rotor frame 10 is provided with a weight-reducing hole 12, which penetrates the rotor frame 10 along the axial direction of the rotor frame 10. In this way, the weight of the rotor frame 10 can be reduced, thereby facilitating the assembly and transportation of the rotor frame 10, and the material usage of the rotor frame 10 can be reduced, thereby reducing the production cost.

[0066] For example, as shown in FIGS. 1 and 2, the rotor frame 10 is provided with eight weight-reducing holes 12, which are arranged at intervals along the circumferential direction of the rotor frame 10.

[0067] According to the motor 1000 of the second aspect of the present application, referring to FIG. 1, the motor 1000 comprises the motor rotor 100 of the first aspect of the present application.

[0068] According to the motor 1000 of the present application, by arranging the plurality of magnets 21 in sequence and connecting them to form the magnetic unit 20, and arranging the magnetic unit 20 in the mounting hole 111 of the rotor frame 10, the temperature rise of the magnetic unit 20 can be reduced, thereby ensuring the operating efficiency of the rotor and saving rotor energy consumption.

[0069] According to the vehicle 1 of the third aspect of the present application, referring to FIG. 11, the vehicle 1 comprises the motor 1000 of the first aspect of the present application.

[0070] According to the vehicle 1 of the present application, by arranging the motor 1000 of the second aspect of the present application on the motor, and arranging the motor rotor 100 of the first aspect of the present application on the motor rotor 100, and arranging the plurality of magnets 21 in sequence and connecting them to form the magnetic unit 20, and arranging the magnetic unit 20 in the mounting hole 111 of the rotor frame 10, the temperature rise of the magnetic unit 20 can be reduced, thereby ensuring the operating efficiency of the rotor and saving rotor energy consumption.

[0071] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0072] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0073] In this 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 mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0074] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0075] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. An electric machine rotor, wherein, The motor rotor comprises: a rotor holder having mounting holes arranged along the circumference of the motor rotor; and magnetic units arranged in the mounting holes, at least one of the magnetic units comprising a plurality of magnets arranged in sequence and connected to each other. The plurality of magnets are arranged along the width direction of the magnetic unit; and / or, 2. The motor rotor of claim 1, wherein, the plurality of magnets are arranged in layers along the thickness direction of the magnetic unit. At least part of the plurality of magnets are connected by bonding.

3. The motor rotor of any one of claims 1 or 2, wherein, At least part of the plurality of magnets are connected by structural adhesive bonding.

4. The motor rotor of claim 3, wherein, In the arrangement direction of the plurality of magnets, the magnetic induction intensity of the magnets at both ends of the magnetic unit is greater than that of the remaining magnets.

5. The motor rotor of any one of claims 1-4, wherein, The number of the mounting holes is multiple, and the mounting holes are arranged at intervals, and each of the mounting holes is provided with the magnetic unit.

6. The motor rotor of any one of claims 1-5, wherein, The plurality of mounting holes constitute at least one mounting group, and the mounting group is composed of a plurality of mounting holes adjacent in the circumferential direction of the motor rotor, and the plurality of mounting holes of the mounting group are arranged radially symmetrically with respect to the motor rotor.

7. The motor rotor of claim 6, wherein, The plurality of mounting holes of the mounting group are arranged in at least one V-shaped structure opening towards the outer periphery of the rotor holder.

8. The motor rotor of claim 7, wherein, The mounting holes are provided with a plurality of magnetic units arranged in sequence along the axial direction of the motor rotor.

9. The motor rotor of any one of claims 1-8, wherein, The rotor holder is provided with a weight-reducing hole.

10. The electrical machine rotor of any one of claims 1-9, wherein, The motor rotor of any one of claims 1-10.

11. An electric machine wherein, The motor of claim 11.

12. A vehicle, wherein, ​

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