Rotor, electric motor, drive assembly and vehicle

Abstract

A rotor, an electric motor, a drive assembly and a vehicle. The rotor has a first magnetic portion and a second magnetic portion, wherein the first magnetic portion and the second magnetic portion are arranged spaced apart from each other in the circumferential direction of the rotor, the first magnetic portion and the second magnetic portion have opposite polarities, and the coercivity of at least part of the second magnetic portion is less than that of the first magnetic portion.

Description

Rotors, motors, drive assemblies and vehicles

[0001] This application claims priority to Chinese patent application No. 202411718546.0, filed on November 26, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of vehicle technology, and more particularly to a rotor, motor, drive assembly, and vehicle. Background Technology

[0003] Permanent magnet motors, as a type of motor, have advantages such as high efficiency and good mechanical properties, and are widely used in industry.

[0004] In related technologies, a permanent magnet motor includes a rotor, which comprises a rotor core and a magnetic component disposed within the rotor core. This magnetic component uses a low-coercivity permanent magnet, whose magnetization state is easily changed, allowing the motor to adapt to different operating conditions and achieve efficient operation under varying circumstances. Summary of the Invention

[0005] This disclosure provides a rotor, motor, drive assembly, and vehicle to solve, or at least partially solve, the problem in the related art where the low coercivity of permanent magnets poses a risk of demagnetization, affecting the reliability of the motor.

[0006] In a first aspect, a rotor is provided, the rotor having a first magnetic portion and a second magnetic portion, the first magnetic portion and the second magnetic portion being arranged at intervals along the circumference of the rotor, and the first magnetic portion and the second magnetic portion having opposite polarities. At least a portion of the coercivity of the second magnetic portion is less than the coercivity of the first magnetic portion.

[0007] In a second aspect, an electric motor is provided, the electric motor including the rotor and stator described in the first aspect, the stator and the rotor being spaced apart along the axial direction of the electric motor.

[0008] Thirdly, a powertrain is provided, the powertrain including the electric motor described in the second aspect.

[0009] Fourthly, a vehicle is provided, the vehicle including the electric motor described in the second aspect, or the powertrain described in the third aspect.

[0010] In summary, this disclosure provides a rotor, a motor, a drive assembly, and a vehicle. The rotor has a first magnetic portion and a second magnetic portion, which are arranged circumferentially around the rotor and have opposite polarities. At least a portion of the second magnetic portion has a coercivity less than that of the first magnetic portion.

[0011] In some embodiments of this disclosure, since the coercivity of at least a portion of the second magnetic portion is less than that of the first magnetic portion, meaning that the magnetization states of the second and first magnetic portions are different, the magnetization state of the second magnetic portion with lower coercivity is more easily changed during motor operation than that of the first magnetic portion with higher coercivity. This allows the motor to adapt to different operating conditions in a timely manner, achieving efficient operation across the entire motor operating range. Conversely, the magnetization state of the first magnetic portion with higher coercivity is less prone to change, which helps improve the rotor's load magnetic stability, avoids the risk of rotor demagnetization, and thus improves the reliability of motor operation. Attached Figure Description

[0012] Figure 1 is an exploded view of a motor according to some embodiments;

[0013] Figure 2 is a structural diagram of a rotor according to some embodiments;

[0014] Figure 3 is a structural diagram of a rotor according to some embodiments;

[0015] Figure 4 is a structural diagram of the housing according to some embodiments;

[0016] Figure 5 is a structural diagram of the housing according to some embodiments;

[0017] Figure 6 is a cross-sectional view of a motor according to some embodiments;

[0018] Figure 7 is a second cross-sectional view of a motor according to some embodiments;

[0019] Figure 8 is a structural diagram of a stator according to some embodiments;

[0020] Figure 9 is a structural diagram of the stator according to some embodiments;

[0021] Figure 10 is a structural diagram of a stator core according to some embodiments;

[0022] Figure 11 is a structural diagram of a stator core according to some embodiments;

[0023] Figure 12 is a structural diagram of a seal according to some embodiments;

[0024] Figure 13 is a structural diagram of a seal and a cooling assembly according to some embodiments;

[0025] Figure 14 is a block diagram of a powertrain according to some embodiments;

[0026] Figure 15 is a block diagram of a vehicle according to some embodiments;

[0027] Figure 16 is another block diagram of a vehicle according to some embodiments.

[0028] Reference numerals: 1000: Vehicle; 500: Powertrain; 100: Motor; 10: Housing; 11: Cooling medium inlet channel; 12: Cooling medium outlet channel; 13: End plate; 14: First side plate; 15: Second side plate; 16: Mounting cavity; 20: Stator; 21: Stator core; 211: Second cooling medium channel; 2111: First sub-cooling medium channel; 2112: Second sub-cooling medium channel; 212: First mounting groove; 22: Stator winding; 221: First end winding; 222: Second end winding; 30: Seal; 31: First sealing ring; 32: Second sealing ring; 33: Sealing part; 40: Cooling assembly; 41: First cooling component; 411: First spray hole; 42: Second cooling component; 421: Second spray hole; 50: Cooling chamber; 51: First cooling chamber; 511: First sub-cooling chamber; 512: Second sub-cooling chamber; 52: Second cooling chamber; 521: Third sub-cooling chamber; 522: Fourth sub-cooling chamber; 60: Shaft; 70: Rotor; 71: First magnetic part; 711: Third magnetic component; 72: Second magnetic part; 721: First magnetic component; 722: Second magnetic component; 73: Support part; 74: Protection part. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0031] In related technologies, permanent magnets with low coercivity are at risk of demagnetization, which affects the reliability of the motor.

[0032] As shown in Figures 1 and 2, some embodiments of this disclosure provide a rotor 70 having a first magnetic portion 71 and a second magnetic portion 72, the first magnetic portion 71 and the second magnetic portion 72 being arranged at intervals along the circumference of the rotor 70, and the polarities of the first magnetic portion 71 and the second magnetic portion 72 being opposite. At least a portion of the coercivity of the second magnetic portion 72 is less than the coercivity of the first magnetic portion 71.

[0033] This disclosure provides embodiments of a rotor 70 for use in an electric motor. For example, the rotor 70 can be used in an axial flux motor. Of course, the rotor can also be used in other types of motors.

[0034] The following will use the rotor 70 in an axial flux motor as an example to describe some embodiments of this disclosure. As shown in FIG1, the motor 100 has a rotating shaft 60, and the rotor 70 is sleeved on the rotating shaft 60 and rotates about the axial direction of the rotating shaft 60.

[0035] As shown in Figures 2 and 3, in some embodiments of this disclosure, the rotor 70 has a first magnetic part 71 and a second magnetic part 72, which are arranged at intervals along the circumference of the rotor 70. Multiple first magnetic parts 71 and multiple second magnetic parts 72 can be provided, with the multiple first magnetic parts 71 and multiple second magnetic parts 72 arranged alternately along the circumference of the rotor 70. That is, along the circumference of the rotor 70, each first magnetic part 71 has a second magnetic part 72 on both sides, and each second magnetic part 72 has a first magnetic part 71 on both sides.

[0036] The magnetic poles of the first magnetic part 71 and the second magnetic part 72 are opposite. That is, when the first magnetic part 71 is the positive pole (N pole), the second magnetic part 72 is the negative pole (S pole). When the first magnetic part 71 is the negative pole (S pole), the second magnetic part 72 is the positive pole (N pole).

[0037] It should be noted that in some embodiments of this disclosure, the first magnetic part 71 and the second magnetic part 72 may include one permanent magnet or multiple permanent magnets. When both the first magnetic part 71 and the second magnetic part 72 include one permanent magnet, the coercivity of the first magnetic part 71 and the second magnetic part 72 refers to the coercivity of that permanent magnet. When the first magnetic part 71 and the second magnetic part 72 include multiple permanent magnets, the coercivity of the first magnetic part 71 and the second magnetic part 72 refers to the combined and superimposed coercivity of the multiple permanent magnets.

[0038] Taking an example where both the first magnetic section 71 and the second magnetic section 72 include multiple permanent magnets, the coercivity of the multiple permanent magnets in the first magnetic section 71 can be greater than the coercivity of the multiple permanent magnets in the second magnetic section 72. That is, the coercivity of the permanent magnets in the second magnetic section 72 is smaller than the coercivity of the permanent magnets in the first magnetic section 71. Alternatively, the coercivity of some of the permanent magnets in the first magnetic section 71 can be greater than the coercivity of the multiple permanent magnets in the second magnetic section 72. That is, the coercivity of some of the permanent magnets in the second magnetic section 72 is the same as the coercivity of the permanent magnets in the first magnetic section 71, while the coercivity of another portion of the permanent magnets is smaller than the coercivity of the permanent magnets in the first magnetic section 71. This ensures that at least a portion of the coercivity of the second magnetic section 72 is smaller than the coercivity of the first magnetic section 71.

[0039] It should be noted that in some embodiments of this disclosure, coercivity is also referred to as magnetism retention. Coercivity refers to the magnetic field strength required to reduce the magnetization of a permanent magnet to zero after it has been magnetized to saturation. It can be understood that coercivity represents the ability of a permanent magnet to resist demagnetization.

[0040] In some embodiments of this disclosure, the coercivity of at least a portion of the second magnetic portion 72 is set to be less than that of the first magnetic portion 71. That is, the magnetization states of the second magnetic portion 72 and the first magnetic portion 71 are different. During motor operation, the magnetization state of the second magnetic portion 72, with its lower coercivity, is more easily changed than that of the first magnetic portion 71, which has higher coercivity. This allows the motor to adapt to different operating conditions in a timely manner, achieving efficient operation across the entire motor's operating range. Conversely, the magnetization state of the first magnetic portion 71, with its higher coercivity, is less prone to change. This helps improve the load magnetic stability of the rotor 70, avoids the risk of demagnetization in the rotor 70, and thus improves the reliability of motor operation.

[0041] In some embodiments, as shown in Figures 2 and 3, the second magnetic part 72 includes a first magnetic element 721 and a second magnetic element 722, wherein the coercivity of the first magnetic element 721 is less than the coercivity of the second magnetic element 722.

[0042] In some embodiments of this disclosure, the second magnetic part 72 includes a first magnetic element 721 and a second magnetic element 722, wherein the coercivity of the first magnetic element 721 is less than that of the second magnetic element 722. That is, the magnetization states of the first magnetic element 721 and the second magnetic element 722 are different. During motor operation, the magnetization state of the first magnetic element 721, with its lower coercivity, is more easily changed than that of the second magnetic element 722, which has a higher coercivity. This allows the motor to adapt to different operating conditions in a timely manner, achieving efficient operation across the entire operating range. Furthermore, the magnetic state of the second magnetic element 722, with its higher coercivity, is less prone to change, which helps improve the load magnetic stability of the rotor 70, avoids the risk of demagnetization in the rotor 70, and thus improves the reliability of motor operation.

[0043] It should be noted that in some embodiments of this disclosure, the first magnetic element 721 and the second magnetic element 722 are permanent magnets with different coercivity. Furthermore, the coercivity of the first magnetic element 721 is less than that of the second magnetic element 722. That is, the combined coercivity of at least one permanent magnet in the first magnetic element 721 is less than the combined coercivity of at least one permanent magnet in the second magnetic element 722. The first magnetic element 721 may include only one permanent magnet or multiple permanent magnets. The second magnetic element 722 may include only one permanent magnet or multiple permanent magnets.

[0044] In some embodiments, as shown in FIG2 and FIG3, the second magnetic part 72 and the first magnetic element 721 in some embodiments of the present disclosure may be provided in a plurality of ways, and the plurality of first magnetic elements 721 are spaced apart along at least one of the radial and circumferential directions of the rotor 70.

[0045] In some embodiments of this disclosure, multiple first magnetic elements 721 may be provided. The multiple first magnetic elements 721 may be arranged radially spaced along the rotor 70, or the multiple first magnetic elements 721 may be arranged circumferentially spaced along the rotor 70, or the multiple first magnetic elements 721 may be arranged both radially and circumferentially spaced along the rotor 70.

[0046] In some embodiments of this disclosure, a plurality of first magnetic elements 721 with lower coercivity are provided in the second magnetic part 72, such that the magnetization states of the first magnetic elements 721 and the second magnetic elements 722 are different. Thus, during motor operation, the magnetization state of the first magnetic elements 721 with lower coercivity is more easily changed than that of the second magnetic elements 722 with higher coercivity, enabling the motor to adapt to different operating conditions more promptly and achieve efficient operation across all operating conditions. Furthermore, the magnetic state of the second magnetic elements 722 with higher coercivity is less easily changed, thereby helping to improve the load magnetic stability of the rotor 70, avoiding the risk of demagnetization of the rotor 70, and thus improving the reliability of motor operation.

[0047] In some embodiments, at least one first magnetic element 721 is a composite magnetic element, which has a first sub-magnetic element and a second sub-magnetic element with different coercivity.

[0048] In some embodiments of this disclosure, the first magnetic element 721 can also be a composite magnetic element, which refers to a magnetic element in which the coercivity of one part is greater than that of another part. This results in the composite magnetic element having at least two parts with different coercivities. For example, the composite magnetic element can have a first sub-magnetic element and a second sub-magnetic element with different coercivities.

[0049] Of course, composite magnetic components can also have three or four parts with different coercivity, etc. This disclosure makes no limitation on this. In practical applications, those skilled in the art can choose according to their needs.

[0050] In some embodiments of this disclosure, magnetization is achieved by configuring at least one first magnetic element 721 as a composite magnetic element. Furthermore, the overall antimagnetic demagnetization performance of the second magnetic part 72 can be improved, avoiding unintended or unplanned irreversible demagnetization, thereby enhancing the operational reliability of the motor.

[0051] In some embodiments, the magnetic circuits of the first sub-magnetic element and the second sub-magnetic element are connected in series or in parallel.

[0052] In some embodiments of this disclosure, the first and second sub-magnetic elements in the composite magnetic component can be arranged radially along the rotor 70 to form a series magnetic circuit structure. Alternatively, the first and second sub-magnetic elements in the composite magnetic component can be arranged circumferentially along the rotor 70 to form a parallel magnetic circuit structure.

[0053] In some embodiments of this disclosure, by providing a variety of different arrangements of the composite magnetic components, the arrangement of the composite magnetic components is made more flexible and applicable, thereby expanding the application scenarios of the rotor 70.

[0054] In some embodiments, the rotor 70 further satisfies at least one of the following: the coercivity of the first sub-magnetic element is less than or equal to the coercivity of the first magnetic element 721, and the coercivity of the second sub-magnetic element is less than or equal to the coercivity of the second magnetic element 722.

[0055] In some embodiments of this disclosure, the rotor 70 further satisfies at least one of the following: the coercivity of the first sub-magnetic element is set to be less than or equal to the coercivity of the first magnetic element 721, and the coercivity of the second sub-magnetic element is set to be less than or equal to the coercivity of the second magnetic element 722. This results in a lower overall coercivity of the composite magnetic element. Consequently, the magnetization state of the composite magnetic element is more easily changed, enabling the motor to adapt to different operating conditions more promptly and achieve efficient operation across all operating conditions.

[0056] In some embodiments, the second magnetic element 722 and the composite magnetic element are spaced apart along at least one of the radial and circumferential directions of the rotor 70.

[0057] When the first magnetic element 721 is a composite magnetic element, the second magnetic element 722 can be arranged radially spaced from the composite magnetic element along the rotor 70, or circumferentially spaced from the composite magnetic element along the rotor 70, or both radially and circumferentially spaced from the rotor 70. This disclosure does not limit this arrangement; in practical applications, those skilled in the art can configure it according to different operating conditions.

[0058] In some embodiments of this disclosure, by providing a variety of different arrangements of the second magnetic element 722 and the composite magnetic element, the arrangement of the second magnetic element 722 and the composite magnetic element is made more flexible and applicable, thereby expanding the application scenarios of the rotor 70.

[0059] In some embodiments, the first magnetic element 721 is a composite magnetic element, and the composite magnetic element and the second magnetic element 722 are arranged radially along the rotor 70. The rotor 70 also satisfies at least one of the following: the composite magnetic element is disposed radially inner to the rotor 70, and the composite magnetic element is disposed radially outer to the rotor 70.

[0060] When the first magnetic element 721 is a composite magnetic element, the composite magnetic element and the second magnetic element 722 can be arranged radially along the rotor 70. The composite magnetic element can be arranged radially inside the rotor 70, or radially outside the rotor 70, or both radially inside and radially outside the rotor 70. That is, at least two composite magnetic elements are provided, one radially inside the rotor 70 and the other radially outside the rotor 70.

[0061] In some embodiments of this disclosure, by flexibly setting the position of the composite magnetic element in the second magnetic part 72, the arrangement of permanent magnets in the second magnetic part 72 is made more flexible and applicable, thereby making the application scenarios of the rotor 70 wider.

[0062] In some embodiments, the second magnetic element 722 and the first magnetic element 721 are spaced apart along at least one of the radial and circumferential directions of the rotor 70.

[0063] In some embodiments of this disclosure, the second magnetic part 72 may include a first magnetic element 721 and a second magnetic element 722. The first magnetic element 721 and the second magnetic element 722 may be arranged radially spaced along the rotor 70, or the first magnetic element 721 and the second magnetic element 722 may be arranged circumferentially spaced along the rotor 70, or multiple first magnetic elements 721 and multiple second magnetic elements 722 may be provided, with multiple first magnetic elements 721 and multiple second magnetic elements 722 arranged both radially and circumferentially spaced along the rotor 70.

[0064] In some embodiments of this disclosure, by providing a variety of different arrangements of the first magnetic element 721 and the second magnetic element 722 in the second magnetic part 72, the arrangement of the first magnetic element 721 and the second magnetic element 722 is made more flexible and more applicable, thereby making the application scenarios of the rotor 70 wider.

[0065] In some embodiments, a plurality of second magnetic elements 722 are provided, at least one of the plurality of second magnetic elements 722 is disposed radially inside the first magnetic element 721, and at least one of the plurality of second magnetic elements 722 is disposed radially outside the first magnetic element 721.

[0066] In some embodiments of this disclosure, at least one second magnetic element 722 may be disposed radially inner to the first magnetic element 721, and at least one second magnetic element 722 may be disposed radially outer to the first magnetic element 721. This enhances the stability of the second magnetic portion 72 by using the second magnetic elements 722 located radially inner and radially outer, thereby giving the second magnetic portion 72 a stronger magnetic stabilization capability. This improves the load magnetic stability of the rotor 70, avoids the risk of demagnetization in the rotor 70, and thus helps improve the reliability of motor operation.

[0067] In some embodiments, as shown in Figures 2 and 3, the first magnetic part 71 includes a third magnetic element 711, the coercivity of the third magnetic element 711 being greater than or equal to the coercivity of the second magnetic element 722.

[0068] In some embodiments of this disclosure, the first magnetic part 71 includes a third magnetic element 711, which may be a single permanent magnet or may include multiple permanent magnets.

[0069] In some embodiments of this disclosure, the coercivity of the third magnetic element 711 is set to be greater than or equal to the coercivity of the second magnetic element 722, so that the coercivity of the first magnetic part 71 is greater than that of the second magnetic part 72, thereby making the magnetization state of the first magnetic part 71 with higher coercivity less prone to change. This helps improve the load magnetic stability of the rotor 70, avoids the risk of demagnetization of the rotor 70, and thus improves the reliability of motor operation.

[0070] In some embodiments, as shown in Figures 2 and 3, a plurality of third magnetic elements 711 are provided, and the plurality of third magnetic elements 711 are provided along at least one of the radial and circumferential directions of the rotor 70.

[0071] In some embodiments of this disclosure, a plurality of third magnetic elements 711 may be arranged radially along the rotor 70, or a plurality of third magnetic elements 711 may be arranged circumferentially along the rotor 70, or a portion of the plurality of third magnetic elements 711 may be arranged radially along the rotor 70 and another portion of the plurality of third magnetic elements 711 may be arranged circumferentially along the rotor 70.

[0072] In some embodiments of this disclosure, by providing a variety of different arrangements of the third magnetic elements 711 in the first magnetic part 71, the arrangement of the third magnetic elements 711 is made more flexible and more applicable, thereby making the application scenarios of the rotor 70 more extensive.

[0073] In some embodiments, as shown in Figures 2 and 3, the first magnetic part 71 and the second magnetic part 72 constitute a series-parallel hybrid magnetic circuit structure.

[0074] Taking a first magnetic section 71 comprising multiple permanent magnets arranged radially spaced along the rotor 70, and a second magnetic section 72 comprising multiple permanent magnets arranged circumferentially spaced along the rotor 70 as an example, the multiple permanent magnets in the first magnetic section 71 are connected in series to form a series magnetic circuit structure. The multiple permanent magnets in the second magnetic section 72 are connected in parallel to form a parallel magnetic circuit structure. The first magnetic section 71 and the second magnetic section 72 are connected in parallel to form a parallel magnetic circuit structure.

[0075] This disclosure does not provide specific examples of the arrangement and series / parallel connection methods of the multiple permanent magnets in the first magnetic section 71 and the multiple permanent magnets in the second magnetic section 72. In practical applications, those skilled in the art can configure these methods as needed.

[0076] In some embodiments of this disclosure, by providing a variety of different arrangements of the first magnetic part 71 and the second magnetic part 72, the arrangement of permanent magnets in the rotor 70 is made more flexible and applicable, thereby making the application scenarios of the rotor 70 wider.

[0077] In some embodiments, the first magnetic part 71 and the second magnetic part 72 each include at least one permanent magnet, which may be at least one of ferrite permanent magnet, AlNiCo permanent magnet, NdFeB permanent magnet, Samarium Cobalt permanent magnet, and Iron Nitride permanent magnet.

[0078] The permanent magnets in some embodiments of this disclosure include, but are not limited to, ferrite permanent magnets, AlNiCo permanent magnets, NdFeB permanent magnets, Samarium Cobalt permanent magnets, and Iron Nitride permanent magnets. This disclosure does not impose excessive limitations on the type of permanent magnet. In practical applications, those skilled in the art can select according to their needs. In some embodiments of this disclosure, by providing different types of permanent magnets, the selection of permanent magnets in the first magnetic section 71 and the second magnetic section 72 becomes more flexible.

[0079] In some embodiments, both the first magnetic part 71 and the second magnetic part 72 include a plurality of permanent magnets. The permanent magnet material of the first magnetic part 71 may be the same as or different from the permanent magnet material of the second magnetic part 72.

[0080] In practical applications, the material of the permanent magnet in the first magnetic section 71 can be the same as the material of the permanent magnet in the second magnetic section 72, but their coercivity is different. This achieves the goal that at least a portion of the coercivity of the second magnetic section 72 is less than that of the first magnetic section 71. Alternatively, the material of the permanent magnet in the first magnetic section 71 can be different from that of the permanent magnet in the second magnetic section 72, and their coercivity can also be different, thus achieving the goal that at least a portion of the coercivity of the second magnetic section 72 is less than that of the first magnetic section 71.

[0081] In some embodiments of this disclosure, by setting the permanent magnet material of the first magnetic part 71 to be the same as or different from the permanent magnet material of the second magnetic part 72, those skilled in the art can flexibly combine permanent magnets to form the first magnetic part 71 and the second magnetic part 72 during application.

[0082] In some embodiments, the second magnetic part 72 includes a plurality of permanent magnets, which may be made of the same or different materials.

[0083] In some embodiments of this disclosure, the materials of the plurality of permanent magnets in the second magnetic section 72 may be the same, but the coercivity of a portion of the permanent magnets may be less than that of another portion, so that the second magnetic section 72 contains permanent magnets with different coercivities. The materials of the plurality of permanent magnets in the second magnetic section 72 may also be different, and the coercivity of a portion of the permanent magnets may be less than that of another portion, so that the second magnetic section 72 contains permanent magnets with different coercivities.

[0084] In some embodiments of this disclosure, by setting the materials of the plurality of permanent magnets in the second magnetic part 72 to be the same or different, a person skilled in the art can flexibly combine the permanent magnets to form the second magnetic part 72 during application.

[0085] In some embodiments, the permanent magnet includes at least one of a multi-segment structure and a monolithic structure.

[0086] In some embodiments of this disclosure, the permanent magnet can be a monolithic structure, meaning that the permanent magnet is a single unit with the same coercivity at all locations. In other embodiments of this disclosure, the permanent magnet can also be a multi-segment structure, meaning that the permanent magnet comprises multiple segments, each with a different coercivity, or at least one segment has a different coercivity than the other segments.

[0087] In some embodiments of this disclosure, by setting the permanent magnet as at least one of a multi-segment structure or an integral structure, the selection of the permanent magnet in the rotor 70 is made more flexible, the applicability of the rotor 70 is made wider, and thus the application scenarios of the rotor 70 are made broader.

[0088] In some embodiments, as shown in Figures 2 and 3, the permanent magnet in some embodiments of this disclosure is at least one of a fan-shaped structure, a trapezoidal structure, and a square structure.

[0089] As shown in Figures 2 and 3, in some embodiments of this disclosure, the permanent magnet can be configured as a fan-shaped structure, a trapezoidal structure, or a square structure. It should be noted that the permanent magnet in some embodiments of this disclosure can also be configured as a fan-like structure, which refers to a fan-shaped structure with chamfered corners. Similarly, the permanent magnet in some embodiments of this disclosure can also be configured as a trapezoidal structure, which refers to a trapezoidal structure with chamfered corners. Furthermore, the permanent magnet in some embodiments of this disclosure can also be configured as a square structure, which refers to a square structure with chamfered corners. Of course, the above are just individual examples of permanent magnet structures and are not intended to limit the scope of this disclosure. In practical applications, those skilled in the art can configure the structure of the permanent magnet as needed.

[0090] In some embodiments of this disclosure, by setting the permanent magnets as at least one of a fan-shaped structure, a trapezoidal structure, and a square structure, and arranging multiple permanent magnets at intervals along the circumference of the rotor 70, more permanent magnets can be arranged within the rotor 70, thereby improving the reliability of motor operation.

[0091] In some embodiments, the rotor 70 further satisfies at least one of the following: the first magnetic part 71 has a first center line, and the permanent magnets of the first magnetic part 71 are symmetrically or asymmetrically arranged along the first center line; and the second magnetic part 72 has a second center line, and the permanent magnets of the second magnetic part 72 are symmetrically or asymmetrically arranged along the second center line.

[0092] In some embodiments of this disclosure, the first magnetic section 71 has a first center line, the extension direction of which is the same as the radial direction of the rotor 70. The second magnetic section 72 has a second center line, the extension direction of which is the same as the radial direction of the rotor 70. The permanent magnets of the first magnetic section 71 can be symmetrically arranged along the first center line, and the permanent magnets of the second magnetic section 72 can be symmetrically arranged along the second center line. The symmetrical arrangement of the permanent magnets can generate a more uniform magnetic field distribution. Since the magnetic field lines are evenly distributed on both sides of the magnetic pole center line, it helps to reduce the non-uniformity of magnetic flux, thereby reducing electromagnetic noise and vibration. In addition, a uniform magnetic field distribution means that the motor can utilize magnetic energy more effectively during operation, reducing energy loss. This helps to improve the overall efficiency of the motor, enabling it to maintain high performance under various operating conditions.

[0093] Of course, the permanent magnets in the first magnetic section 71 can also be arranged asymmetrically along the first center line, and the permanent magnets in the second magnetic section 72 can also be arranged asymmetrically along the second center line. In this way, the flexibility of the permanent magnet arrangement can be enhanced, making the rotor 70 more applicable and thus expanding the application scenarios of the rotor 70.

[0094] In some embodiments, the rotor 70 includes a rotor core with a mounting groove configured to accommodate a first magnetic portion 71 and a second magnetic portion 72.

[0095] In some embodiments of this disclosure, mounting slots are provided on the rotor core to facilitate the placement of the permanent magnets of the first magnetic part 71 and the second magnetic part 72 into the mounting slots. The mounting slots fix the permanent magnets of the first magnetic part 71 and the second magnetic part 72, allowing the permanent magnets to be installed in a preset position. This optimizes the magnetic circuit of the rotor 70 and ensures the reliability of motor operation.

[0096] In some embodiments, as shown in Figures 2 and 3, the mounting slot includes a plurality of recesses spaced apart along at least one of the radial and circumferential directions of the rotor 70.

[0097] In some embodiments of this disclosure, the mounting slot includes multiple recesses. These recesses are arranged radially spaced along the rotor 70, or circumferentially spaced along the rotor 70, or a portion of the recesses are arranged radially spaced while another portion is arranged circumferentially spaced. In this way, the permanent magnets in the first magnetic section 71 and the second magnetic section 72 are fixed by the multiple recesses, allowing the permanent magnets in the first magnetic section 71 and the second magnetic section 72 to be installed in preset positions, achieving the desired magnetic circuit in the rotor 70 and ensuring the reliability of motor operation.

[0098] In some embodiments, at least one permanent magnet of the first magnetic part 71 or the second magnetic part 72 may be disposed in a groove.

[0099] In some embodiments of this disclosure, a permanent magnet of the first magnetic part 71 may be disposed in a groove, or multiple permanent magnets of the first magnetic part 71 may be disposed in a groove. Alternatively, a permanent magnet of the second magnetic part 72 may be disposed in a groove, or multiple permanent magnets of the second magnetic part 72 may be disposed in a groove.

[0100] This disclosure does not impose any limitations. In practical applications, technicians can flexibly configure the settings as needed to optimize the magnetic circuit of rotor 70 and improve the reliability of the motor.

[0101] In some embodiments, as shown in Figures 2 and 3, the rotor core further includes a support portion 73 and a protection portion 74, with the support portion 73 disposed on the radially inner side of the rotor core and the protection portion 74 disposed on the radially outer side of the rotor core.

[0102] As shown in Figures 2 and 3, in some embodiments of this disclosure, a support portion 73 is provided on the radially inner side of the rotor core to support the first magnetic portion 71 and the second magnetic portion 72, thereby improving the stability of the rotor core. A protective portion 74 is provided on the radially outer side of the rotor core to protect the first magnetic portion 71 and the second magnetic portion 72, preventing damage to them.

[0103] In some embodiments, as shown in FIG1, two rotor cores are provided, and the two rotor cores are arranged sequentially along the axial direction of the rotor 70.

[0104] In some embodiments of this disclosure, two rotor cores can be provided, arranged sequentially along the axial direction of the rotor 70, to create a segmented rotor core structure. This reduces magnetic leakage losses in the rotor 70 and improves motor efficiency. Furthermore, it also reduces the machining difficulty of the rotor 70 and improves its machining efficiency.

[0105] Some embodiments of this disclosure also provide an electric motor 100, which includes the rotor 70 and stator 20 described above, the stator 20 and the rotor 70 being spaced apart along the axial direction of the motor.

[0106] The motor in some embodiments of this disclosure includes the rotor 70, shaft 60, and stator 20 described above. Both the rotor 70 and stator 20 are housed within the housing 10, and are spaced apart axially from each other along the shaft 60. The shaft 60 passes through the stator 20 and rotor 70 along the motor's axial direction, is fixedly connected to the rotor 70, and rotatably connected to the stator 20, allowing the rotor 70 to rotate relative to the stator 20. Thus, during motor operation, the electromagnetic interaction between the stator 20 and rotor 70 drives the rotor 70 to rotate and output power. Furthermore, by spaced the rotor 70 and stator 20, i.e., by having a certain gap between them, the electromagnetic interaction area can be precisely controlled, reducing leakage flux and reluctance losses, which is beneficial for improving the motor's energy conversion efficiency and output power.

[0107] In some embodiments, the motor further includes a motor controller electrically connected to the stator winding 22 of the stator 20. The motor controller is configured to output an instantaneous pulse current to cause the stator winding 22 to generate a tuning magnetic field acting on the rotor 70 to change the magnetic flux through the rotor 70.

[0108] In some embodiments of this disclosure, by setting a motor controller, the motor controller can apply an instantaneous pulse current to the stator winding 22 so that the stator winding 22 generates a magnetic field acting on the magnetic structure, thereby changing the magnetization state of the second magnetic part 72 with a smaller coercivity and realizing real-time online magnetic adjustment.

[0109] It should be noted that in some embodiments of this disclosure, the motor controller configured to output instantaneous pulse current and the motor controller configured to output operating current can be shared or set separately. Using instantaneous pulse current (such as direct-axis current) can reduce magnetization losses and improve motor efficiency. In addition, by introducing additional magnetization freedom, it is beneficial to reduce the dependence on armature direct-axis weakening current in the medium and high speed regions, thereby reducing the risk of irreversible demagnetization of permanent magnets.

[0110] In some embodiments, the motor further includes a stator cooling structure comprising a housing 10 configured to house a stator 20, the housing 10 and the stator 20 forming a cooling chamber 50 (see Figures 6 and 7). The housing 10 is provided with a first cooling medium channel, and the stator 20 is provided with a second cooling medium channel 211 (see Figure 10), the first cooling medium channel communicating with the cooling chamber 50 through the second cooling medium channel 211.

[0111] The stator cooling structure disclosed in some embodiments of this disclosure can cool the stator 20 to reduce the temperature of the stator core 21 and stator winding 22, improve the cooling efficiency of the stator 20, and make the motor performance better.

[0112] The stator cooling structure disclosed in some embodiments of this disclosure includes a housing 10, with a stator 20 disposed within the housing 10, and the housing 10 can accommodate the stator 20. The housing 10 and the stator 20 enclose each other to form a cooling chamber 50, that is, the inner wall of the housing 10 can enclose the stator 20 to form a cooling chamber 50.

[0113] The housing 10 is provided with a first cooling medium channel, and the stator 20 is provided with a second cooling medium channel 211. The first cooling medium channel communicates with the cooling chamber 50 through the second cooling medium channel 211. The cooling medium can enter the second cooling medium channel 211 from the first cooling medium channel to cool the stator 20, and then enter the cooling chamber 50 from the second cooling medium channel 211 to cool the ends and some sides of the stator 20, thereby improving the cooling efficiency of the stator 20, optimizing its performance, and thus improving the performance of the motor.

[0114] It should be noted that the cooling medium in some embodiments of this disclosure can be cooling oil, also known as anhydrous coolant. Of course, the above are merely examples of cooling media and are not intended to limit the cooling medium. In practical applications, those skilled in the art can select a suitable cooling medium according to their needs.

[0115] The stator cooling structure disclosed in some embodiments of this disclosure forms a cooling chamber 50 by enclosing a housing 10 and a stator 20. The housing 10 is provided with a first cooling medium channel, and the stator 20 is provided with a second cooling medium channel 211. The first cooling medium channel communicates with the cooling chamber 50 through the second cooling medium channel 211, so that the cooling medium can cool the stator core 21 of the stator 20 from the first cooling medium channel and the second cooling medium channel 211. The cooling medium can also enter the cooling chamber 50 from the second cooling medium channel 211 to cool the stator winding 22 of the stator 20, thereby improving the cooling efficiency of the stator 20 and making the cooling efficiency of the stator 20 higher.

[0116] In some embodiments of this disclosure, a second cooling medium channel 211 is disposed in the stator core 21 of the stator 20, and the cooling medium in the second cooling medium channel 211 can cool one side of the stator core 21. This improves the cooling efficiency of the stator core 21, making the cooling efficiency of the stator core 21 better.

[0117] In some embodiments, as shown in FIG1, FIG8 to FIG11, the second cooling medium channel 211 includes a first sub-cooling medium channel 2111, the first sub-cooling medium channel 2111 extends radially along the stator 20, and the first sub-cooling medium channel 2111 communicates with the first cooling medium channel and the cooling chamber 50.

[0118] As shown in Figures 1, 8 to 11, in some embodiments of this disclosure, the stator 20 includes a stator core 21 and a stator winding 22 wound on the stator core 21. The stator core 21 has an annular structure. The stator winding 22 at least partially protrudes from the radially inner side of the stator core 21 to form a second end winding 222. The stator winding 22 at least partially protrudes from the radially outer side of the stator core 21 to form a first end winding 221. The portion of the stator winding 22 wound around the axial side of the stator core 21 forms a middle winding.

[0119] In some embodiments of this disclosure, a second cooling medium channel 211 is disposed on the stator core 21 of the stator 20, and the cooling medium in the second cooling medium channel 211 is configured to cool one axial side of the stator core 21. The cooling medium can enter the axial side of the stator core 21 from the first cooling medium channel to cool the axial end face of the stator core 21, thereby improving the cooling efficiency of the stator 20.

[0120] In some embodiments of this disclosure, the second cooling medium channel 211 includes a first sub-cooling medium channel 2111, which is disposed on the stator core 21 and extends radially along the stator core 21. Cooling medium can enter the first sub-cooling medium channel 2111 from the first cooling medium channel to cool the stator 20, thereby improving the cooling efficiency of the stator 20.

[0121] In some embodiments, as shown in Figures 8 to 11, the second cooling medium channel 211 further includes a second sub-cooling medium channel 2112, which extends circumferentially along the stator 20 and connects to the first sub-cooling medium channel 2111 and the first cooling medium channel, so that the cooling medium in the first cooling medium channel can enter the first sub-cooling medium channel 2111 through the second sub-cooling medium channel 2112.

[0122] As shown in Figures 8 to 11, in some embodiments of this disclosure, the second cooling medium channel 211 further includes a second sub-cooling medium channel 2112, which is also disposed on the stator core 21 and disposed along the circumference of the stator core 21.

[0123] The second sub-cooling medium channel 2112 is connected to the first sub-cooling medium channel 2111 and the first cooling medium channel. Cooling medium enters the first cooling medium channel and flows into at least one of the first sub-cooling medium channel 2111 and the second sub-cooling medium channel 2112 to cool the stator 20, thereby improving the cooling efficiency of the stator 20 and making the cooling efficiency of the stator 20 better.

[0124] In some embodiments, as shown in Figures 8 to 11, a plurality of first sub-cooling medium channels 2111 are provided, and the plurality of first sub-cooling medium channels 2111 are arranged at intervals along the circumferential direction of the stator 20.

[0125] As shown in Figures 8 to 11, in some embodiments of this disclosure, multiple first sub-cooling medium channels 2111 can be provided. These multiple first sub-cooling medium channels 2111 extend radially along the stator 20 and are arranged at intervals along the circumference of the stator 20. Cooling medium can enter the multiple first sub-cooling medium channels 2111 to cool the stator 20. This is beneficial for improving the cooling efficiency of the stator 20, resulting in better cooling efficiency.

[0126] In some embodiments, multiple second sub-cooling medium channels 2112 are also provided, and the multiple second sub-cooling medium channels 2112 are arranged at radial intervals along the stator 20.

[0127] In some embodiments of this disclosure, multiple second sub-cooling medium channels 2112 may be provided, each arranged circumferentially along the stator 20 and radially spaced apart. Cooling medium can enter the multiple second sub-cooling medium channels 2112 to cool the stator 20. This improves the cooling efficiency of the stator 20, resulting in superior cooling performance.

[0128] It should be noted that in some embodiments of this disclosure, the second sub-cooling medium channel 2112 may be connected to multiple first sub-cooling medium channels 2111, or the second sub-cooling medium channel 2112 may be connected to only a portion of the multiple first sub-cooling medium channels 2111. This disclosure does not impose any limitations on this. In practical applications, those skilled in the art can configure it as needed.

[0129] In some embodiments, as shown in Figures 8 to 11, the first sub-cooling medium channel 2111 and the second sub-cooling medium channel 2112 are both disposed on the stator core 21 of the stator 20.

[0130] As shown in Figures 8 to 11, in some embodiments of this disclosure, the stator 20 includes a stator core 21 and a stator winding 22 wound on the stator core 21. The stator core 21 has a ring-shaped structure, and the coil is wound on the end face, outer peripheral face and inner peripheral face of the stator core 21 to form the stator winding 22.

[0131] In some embodiments of this disclosure, both the first sub-cooling medium channel 2111 and the second sub-cooling medium channel 2112 are disposed on the stator core 21, so that the stator core 21 is cooled by the cooling medium flowing through the first sub-cooling medium channel 2111 and the second sub-cooling medium channel 2112, thereby improving the cooling efficiency of the stator core 21. In addition, after the stator core 21 is cooled, the stator core 21 can also cool the stator winding 22, which also helps to improve the cooling efficiency of the stator winding 22.

[0132] In some embodiments, as shown in Figures 1, 6, and 7, the cooling chamber 50 includes a first cooling chamber 51 and a second cooling chamber 52, which communicate with a first sub-cooling medium channel. The first cooling chamber 51 and the second cooling chamber 52 are spaced apart along the radial direction of the stator 20, with the first cooling chamber 51 located outside the second cooling chamber 52. The first cooling chamber 51 is configured to cool the radially outer side of the stator 20, and the second cooling chamber 52 is configured to cool the radially inner side of the stator 20.

[0133] As shown in Figures 1, 6, and 7, in some embodiments of this disclosure, the cooling chamber 50 includes a first cooling chamber 51 and a second cooling chamber 52. The first cooling chamber 51 and the second cooling chamber 52 are connected to a first cooling medium channel, allowing the cooling medium entering through the first cooling medium channel to flow into the first cooling chamber 51 and the second cooling chamber 52. The first cooling chamber 51 and the second cooling chamber 52 are arranged radially apart along the stator 20. The first cooling chamber 51 is located outside the second cooling chamber 52. That is, along the radial direction of the stator 20, the first cooling chamber 51 is closer to the outer side of the stator 20, and the second cooling chamber 52 is closer to the inner side of the stator 20.

[0134] In some embodiments of this disclosure, a first cooling chamber 51 is located near the radially outer side of the stator 20 to cool the radially outer side of the stator 20. A second cooling chamber 52 is located near the radially inner side of the stator 20 to cool the radially inner side of the stator 20. This improves the cooling efficiency of the stator 20, resulting in higher cooling efficiency and better performance.

[0135] In some embodiments, as shown in Figures 6 and 7, at least a portion of the stator winding 22 of the stator 20 protrudes from the radial outer diameter of the stator core to form a first end winding 221, and at least a portion of the stator winding 22 protrudes from the radial inner diameter of the stator core 21 to form a second end winding 222. A first cooling chamber is configured to receive the first end winding 221 so that the cooling medium contacts the first end winding 221 for heat exchange, and a second cooling chamber 52 is configured to receive the second end winding 222 so that the cooling medium contacts the second end winding 222 for heat exchange.

[0136] As shown in Figures 6 and 7, in some embodiments of this disclosure, the stator winding 22 includes a stator core 21 and a stator winding 22. The stator winding 22 protrudes radially outward from the stator core 21 to form a first end winding 221, and the stator winding 22 protrudes radially outward from the stator core 21 to form a second end winding 222. That is, along the radial direction of the stator 20, the first end winding 221 is wound on the outer side of the stator 20, and the second end winding 222 is wound on the inner side of the stator 20. This allows the first end winding 221 to be located within the first cooling chamber 51, enabling the cooling medium to contact and exchange heat with the first end winding 221, reducing its temperature and improving the cooling efficiency of the stator 20. In addition, the second end winding 222 can be located in the second cooling chamber 52, so that the cooling medium can contact the second end winding 222 and exchange heat with the second end winding 222, thereby reducing the temperature of the second end winding 222 and improving the cooling efficiency of the stator 20.

[0137] In some embodiments, the stator cooling structure further includes a cooling assembly 40, which is disposed in at least one of the first cooling chamber 51 and the second cooling chamber 52, and the cooling assembly 40 can communicate the first cooling medium channel and the second cooling medium channel 211.

[0138] The stator cooling structure disclosed in some embodiments of this disclosure further includes a cooling assembly 40. The cooling assembly 40 is disposed within at least one of a first cooling chamber and a second cooling chamber. The cooling assembly 40 connects a first cooling medium channel and a second cooling medium channel 211, allowing the cooling medium to pass from the first cooling medium channel through the cooling assembly 40 and then enter at least one of the first and second cooling chambers to cool at least one axial and radial side of the stator 20. This improves the cooling efficiency of the stator 20, resulting in higher cooling efficiency and superior performance.

[0139] For example, the cooling assembly 40 is spaced apart from the stator 20 along the axial direction of the stator 20. Alternatively, the cooling assembly 40 is spaced apart from the stator 20 along the radial direction of the stator 20. Of course, the above are merely individual examples of the location of the cooling assembly 40 and are not intended to limit this disclosure. In practical applications, those skilled in the art can also set the location of the cooling assembly 40 as needed.

[0140] In some embodiments, as shown in Figures 1, 6, and 7, the cooling assembly 40 includes a first cooling element 41 and a second cooling element 42, which are spaced apart along the radial direction of the stator 20. The first cooling element 41 is disposed within a first cooling chamber 51 to divide the first cooling chamber 51 into a first sub-cooling chamber 511 and a second sub-cooling chamber 512. Cooling medium can enter the second sub-cooling chamber 512 from the first sub-cooling chamber 511. A first end winding 221 is located within the second sub-cooling chamber 512. The second cooling element 42 is disposed within a second cooling chamber 52 to divide the second cooling chamber 52 into a third sub-cooling chamber 521 and a fourth sub-cooling chamber 522. Cooling medium can enter the fourth sub-cooling chamber 522 from the third sub-cooling chamber 521. A second end winding 222 is located within the fourth sub-cooling chamber 522. The first sub-cooling chamber 511 and the third sub-cooling chamber 521 communicate with a first sub-cooling medium channel 2111.

[0141] As shown in Figures 1, 6, and 7, the cooling assembly 40 in some embodiments of this disclosure includes a first cooling element 41 and a second cooling element 42, which are radially spaced apart along the stator 20. The first cooling element 41 is disposed within a first cooling chamber 51 to divide the first cooling chamber 51 into a first sub-cooling chamber 511 and a second sub-cooling chamber 512. A first end winding 221 is located within the second sub-cooling chamber 512. Cooling medium can flow from the first sub-cooling chamber 511 into the second sub-cooling chamber 512 to cool the first end winding 221, thereby improving the cooling efficiency of the first end winding 221 and making the cooling efficiency of the first end winding 221 higher.

[0142] In some embodiments of this disclosure, a second cooling element 42 is disposed within a second cooling chamber 52 to divide the second cooling chamber 52 into a third sub-cooling chamber 521 and a fourth sub-cooling chamber 522. A second end winding 222 is located within the fourth sub-cooling chamber 522. Cooling medium can flow from the third sub-cooling chamber 521 into the fourth sub-cooling chamber 522 to cool the second end winding 222, thereby improving the cooling efficiency of the second end winding 222 and making it more efficient.

[0143] In some embodiments of this disclosure, the first sub-cooling chamber 511 and the third sub-cooling chamber 521 are in communication with the first sub-cooling medium channel 2111, so that the cooling medium can enter the first sub-cooling chamber 511 and the third sub-cooling chamber 521 from the first sub-cooling medium channel 2111. The cooling medium can also enter the fourth sub-cooling chamber 522 from the third sub-cooling chamber 521 to cool the radially inner side of the stator 20. The cooling medium can also enter the second sub-cooling chamber 512 from the first sub-cooling chamber 511 to cool the radially outer side of the stator 20.

[0144] In some embodiments, the motor further satisfies at least one of the following: the first cooling medium channel includes a cooling medium inlet channel 11 and a cooling medium outlet channel 12; the cooling medium enters the first sub-cooling chamber 511 from the cooling medium inlet channel 11, and is sprayed into the second sub-cooling chamber 512 through the first cooling element 41, flows through the second cooling medium channel 211, and enters the cooling medium outlet channel 12; and the cooling medium enters the third sub-cooling chamber 521 from the cooling medium inlet channel 11, and is sprayed into the fourth sub-cooling chamber 522 through the second cooling element 42, flows through the second cooling medium channel 211, and enters the cooling medium outlet channel 12.

[0145] In some embodiments of this disclosure, the cooling medium can flow from the cooling medium inlet channel 11 into the first sub-cooling chamber 511, and the cooling medium in the first sub-cooling chamber 511 flows through the first cooling element 41 and is sprayed into the second sub-cooling chamber 512 to cool the first end winding 221. It then flows through the second cooling medium channel 211 and into the cooling medium outlet channel 12, exiting the stator cooling structure.

[0146] In some embodiments of this disclosure, the cooling medium may also flow from the cooling medium inlet channel 11 into the third sub-cooling chamber 521. The cooling medium in the third sub-cooling chamber 521 flows through the second cooling element 42 and is sprayed into the fourth sub-cooling chamber 522 to cool the second end winding 222. It then flows through the second cooling medium channel 211 and enters the cooling medium outlet channel 12, exiting the stator cooling structure.

[0147] In some embodiments, the pressure of the cooling medium in the first sub-cooling chamber 511 is greater than the pressure of the cooling medium in the second sub-cooling chamber 512. The pressure of the cooling medium in the third sub-cooling chamber 521 is greater than the pressure of the cooling medium in the fourth sub-cooling chamber 522.

[0148] In some embodiments of this disclosure, the pressure of the cooling medium in the first sub-cooling chamber 511 is greater than the pressure of the cooling medium in the second sub-cooling chamber 512. That is, there is a pressure difference between the first sub-cooling chamber 511 and the second sub-cooling chamber 512, allowing the cooling medium in the first sub-cooling chamber 511 to be injected into the second sub-cooling chamber 512 at a higher injection pressure. On the one hand, the higher injection pressure allows the ejected cooling medium to be finer, thereby increasing the contact area between the cooling medium and the first end winding 221. On the other hand, since the first end winding 221 includes multiple wires, the higher injection pressure allows the cooling medium to enter the gaps between adjacent wires, thereby improving the sufficiency and uniformity of cooling the first end winding 221.

[0149] Similarly, in some embodiments of this disclosure, the pressure of the cooling medium in the third sub-cooling chamber 521 is greater than the pressure of the cooling medium in the fourth sub-cooling chamber 522. That is, a pressure difference exists between the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522, allowing the cooling medium in the third sub-cooling chamber 521 to be injected into the fourth sub-cooling chamber 522 at a higher injection pressure. On one hand, the higher injection pressure allows the ejected cooling medium to be finer, thereby increasing the contact area between the cooling medium and the second end winding 222. On the other hand, since the second end winding 222 includes multiple wires, the higher injection pressure allows the cooling medium to enter the gaps between adjacent wires, thereby improving the sufficiency and uniformity of cooling the second end winding 222.

[0150] In some embodiments of this disclosure, a first cooling member 41 is provided with a first spray hole 411 (see FIG13). The first spray hole 411 is configured to spray cooling medium in a first sub-cooling chamber 511 into a second sub-cooling chamber 512 to cool the first end winding 221. A second cooling member 42 is provided with a second spray hole 421 (see FIG13). The second spray hole 421 is configured to spray cooling medium in a third sub-cooling chamber 521 into a fourth sub-cooling chamber 522 to cool the second end winding 222.

[0151] In some embodiments of this disclosure, a first spray hole 411 is provided on the first cooling member 41 so that the cooling medium in the first sub-cooling chamber 511 can be sprayed into the second sub-cooling chamber 512 through the first spray hole 411 to cool the first end winding 221. A second spray hole 421 is provided on the second cooling member 42 so that the cooling medium in the third sub-cooling chamber 521 can be sprayed into the fourth sub-cooling chamber 522 through the second spray hole 421 to cool the second end winding 222.

[0152] It should be noted that in some embodiments of this disclosure, one or more first spray holes 411 may be provided, with the multiple first spray holes 411 arranged at intervals. One or more second spray holes 421 may be provided, with the multiple second spray holes 421 arranged at intervals.

[0153] In some embodiments, a plurality of first spray holes 411 are provided, and the plurality of first spray holes 411 are arranged at intervals along the circumference of the first cooling member 41. A plurality of second spray holes 421 are provided, and the plurality of second spray holes 421 are arranged at intervals along the circumference of the second cooling member 42.

[0154] In some embodiments of this disclosure, a plurality of first spray holes 411 are provided on the first cooling member 41. The plurality of first spray holes 411 are arranged at intervals along the circumference of the first cooling member 41, so that the cooling medium can be sprayed into the second sub-cooling chamber 512 from the plurality of first spray holes 411, so that the cooling medium is sprayed more evenly and the cooling effect is better.

[0155] In some embodiments of this disclosure, a plurality of second spray holes 421 are provided on the second cooling member 42. The plurality of second spray holes 421 are arranged at intervals along the circumference of the second cooling member 42, so that the cooling medium can be sprayed into the fourth sub-cooling chamber 522 from the plurality of second spray holes 421, so that the cooling medium is sprayed more evenly and the cooling effect is better.

[0156] In some embodiments, the motor also satisfies at least one of the following: a plurality of first cooling elements 41 are provided along the axial direction of the stator 20, and a plurality of second cooling elements 42 are provided along the axial direction of the stator 20, and a plurality of second cooling elements 42 are provided along the axial direction of the stator 20, and a plurality of second cooling elements 42 are provided.

[0157] In some embodiments of this disclosure, multiple first cooling elements 41 may be provided, with the multiple first cooling elements 41 spaced apart along the axial direction of the stator 20, so that the cooling medium can be sprayed into the second sub-cooling chamber 512 through the multiple first cooling elements 41, making the cooling medium spray more uniform and the cooling effect better.

[0158] In some embodiments of this disclosure, multiple second cooling elements 42 may be provided, with the multiple second cooling elements 42 spaced apart along the axial direction of the stator 20, so that the cooling medium can be sprayed into the fourth sub-cooling chamber 522 through the multiple second cooling elements 42, making the cooling medium spray more uniform and the cooling effect better.

[0159] In some embodiments of this disclosure, the first cooling element 41 and the second cooling element 42 are configured in various ways.

[0160] For example, the first cooling element 41 extends radially along the stator 20 such that the first sub-cooling chamber 511 and the second sub-cooling chamber 512 are spaced apart along the axial direction of the stator 20. The second cooling element 42 extends radially along the stator 20 such that the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522 are spaced apart along the axial direction of the stator 20.

[0161] For example, the first cooling element 41 extends radially along the stator 20 such that the first sub-cooling chamber 511 and the second sub-cooling chamber 512 are spaced apart axially along the stator 20. The second cooling element 42 extends axially along the stator 20 such that the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522 are spaced apart radially along the stator 20.

[0162] For example, the first cooling element 41 extends axially along the stator 20 such that the first sub-cooling chamber 511 and the second sub-cooling chamber 512 are distributed radially spaced along the stator 20. The second cooling element 42 extends radially along the stator 20 such that the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522 are distributed axially spaced along the stator 20.

[0163] For example, the first cooling element 41 extends axially along the stator 20 such that the first sub-cooling chamber 511 and the second sub-cooling chamber 512 are radially spaced along the stator 20. The second cooling element 42 extends axially along the stator 20 such that the third sub-cooling chamber 521 and the fourth sub-cooling chamber 522 are radially spaced along the stator 20.

[0164] Of course, the above are merely individual examples of the installation methods of the first cooling component 41 and the second cooling component 42, and are not intended to limit this disclosure. In practical applications, those skilled in the art can also design the installation methods of the first cooling component 41 and the second cooling component 42 as needed.

[0165] In some embodiments of this disclosure, the first cooling chamber 51 can be divided into a first sub-cooling chamber 511 and a second sub-cooling chamber 512 by the first cooling element 41. The first end winding 221 is located in the second sub-cooling chamber 512. The cooling medium in the first sub-cooling chamber 511 can be sprayed into the second sub-cooling chamber 512 through the first cooling element 41 to cool the first end winding 221 located in the second sub-cooling chamber 512, thereby improving the cooling efficiency of the first end winding 221.

[0166] The second cooling chamber 52 can be divided into a third sub-cooling chamber 521 and a fourth sub-cooling chamber 522 by the second cooling element 42. The second end winding 222 is located in the fourth sub-cooling chamber 522. The cooling medium in the third sub-cooling chamber 521 can be sprayed into the fourth sub-cooling chamber 522 through the second cooling element 42 to cool the second end winding 222 located in the fourth sub-cooling chamber 522, thereby improving the cooling efficiency of the second end winding 222.

[0167] In some embodiments, the stator cooling structure further includes a second sealing ring disposed between the cooling assembly 40 and the housing 10 to provide a sealed connection between the cooling assembly 40 and the housing 10. The second sealing ring improves the sealing performance between the cooling assembly 40 and the housing 10, resulting in a better seal between them.

[0168] In some embodiments, as shown in FIG1, FIG6 and FIG12, the stator cooling structure further includes a sealing member 30, which together with the housing 10 and the stator 20 forms a first cooling chamber 51 and a second cooling chamber 52.

[0169] In some embodiments of this disclosure, a first cooling chamber 51 and a second cooling chamber 52 are formed by enclosing a sealing member 30, a housing 10 and a stator 20, so that the first cooling chamber 51 and the second cooling chamber 52 are sealed chambers, thus avoiding the problem of liquid leakage in the first cooling chamber 51 and the second cooling chamber 52.

[0170] In some embodiments, as shown in Figures 1, 6, and 7, the stator 20 includes a stator core 21 and a stator winding 22 wound around the stator core 21. The stator winding 22 at least partially protrudes radially outward from the stator core 21 to form a first end winding 221, and at least partially protrudes radially inward from the stator core 21 to form a second end winding 222. A first cooling chamber 51 is configured to receive the first end winding 221 so that the cooling medium entering the first cooling chamber 51 contacts and exchanges heat with the first end winding 221. A second cooling chamber 52 is configured to receive the second end winding 222 so that the cooling medium entering the second cooling chamber 52 contacts and exchanges heat with the second end winding 222.

[0171] In some embodiments of this disclosure, the stator 20 includes a stator core 21 and a stator winding 22. The stator core 21 has a ring-shaped structure, and the stator winding 22 is wound on the stator core 21. Along the radial direction of the stator core 21, the stator winding 22 at least partially protrudes from the outer side of the stator core 21 to form a first end winding 221. Along the radial direction of the stator core 21, the stator winding 22 at least partially protrudes from the inner side of the stator core 21 to form a second end winding 222.

[0172] The first end winding 221 is located within the second sub-cooling chamber 512 of the first cooling chamber 51. The cooling medium entering the first sub-cooling chamber 511 of the first cooling chamber 51 can be sprayed into the second sub-cooling chamber 512 through the first cooling element 41 to cool the first end winding 221. This improves the cooling efficiency of the first end winding 221, making its cooling efficiency more optimal.

[0173] The second end winding 222 is located in the fourth sub-cooling chamber 522 of the second cooling chamber 52. The cooling medium entering the third sub-cooling chamber 521 of the second cooling chamber 52 can be sprayed into the fourth sub-cooling chamber 522 through the second cooling element 42 to cool the second end winding 222. In this way, the cooling efficiency of the second end winding 222 is improved, making the cooling efficiency of the second end winding 222 better.

[0174] In some embodiments, as shown in Figures 1, 6, and 12, the seal 30 includes a first sealing ring 31 and a second sealing ring 32. The first sealing ring 31 and the second sealing ring 32 are radially spaced along the stator 20 and located outside the second sealing ring 32. The first sealing ring 31, together with the housing 10 and the stator 20, forms a first cooling chamber 51. The second sealing ring 32, together with the housing 10 and the stator 20, forms a second cooling chamber 52.

[0175] In some embodiments of this disclosure, the sealing element 30 includes a first sealing ring 31 and a second sealing ring 32. The first sealing ring 31 and the second sealing ring 32 are arranged radially apart along the stator 20, and the first sealing ring 31 is located outside the second sealing ring 32. The first sealing ring 31, the housing 10, and the stator 20 enclose a first cooling chamber 51. By sealing the first cooling chamber 51 with the first sealing ring 31, the sealing effect of the first cooling chamber 51 is improved, and leakage problems in the first cooling chamber 51 are avoided.

[0176] The second sealing ring 32, the housing 10 and the stator 20 enclose and form the second cooling chamber 52. The second sealing ring 32 seals the second cooling chamber 52, making the sealing effect of the second cooling chamber 52 better and avoiding leakage problems in the second cooling chamber 52.

[0177] In some embodiments, as shown in FIG12, the seal 30 further includes a sealing portion 33, which is disposed between the first sealing ring 31 and the second sealing ring 32 and connected to the first sealing ring 31 and the second sealing ring 32 respectively.

[0178] In some embodiments of this disclosure, the seal 30 further includes a sealing portion 33 connected between the first sealing ring 31 and the second sealing ring 32, so as to connect the seal 30 to the stator 20 through the sealing portion 33 and seal the stator 20.

[0179] This disclosure does not limit the connection method between the sealing part 33 and the first sealing ring 31 and the second sealing ring 32. In practical applications, those skilled in the art can configure it as needed. For example, the sealing part 33 can be connected between the first sealing ring 31 and the second sealing ring 32, and can be integrally formed with the first sealing ring 31 and the second sealing ring 32. The sealing part 33 can also be welded between the first sealing ring 31 and the second sealing ring 32.

[0180] In some embodiments, a first mounting groove 212 (see FIG. 9) extending radially along the stator core 21 is provided on the side of the stator core 21 near the sealing portion 33. The first mounting groove 212 is configured to mount the stator winding 22. The sealing portion 33 is a sealing strip adapted to form a sealing connection with the first mounting groove 212.

[0181] In some embodiments of this disclosure, a first mounting groove 212 extending radially along the stator core 21 is provided on the side of the stator core 21 near the sealing part 33, and the wires of the stator winding 22 are installed in the first mounting groove 212 to fix the wires of the stator winding 22 through the first mounting groove 212.

[0182] Because gaps exist between the multiple wires in the first mounting groove 212, or between the wires and the edge of the first mounting groove 212, the cooling medium in the first cooling chamber 51 and the second cooling chamber 52 may flow through these gaps into the gap between the stator 20 and the rotor 70. Therefore, in some embodiments of this disclosure, a sealing strip is placed inside the first mounting groove 212 to seal it, preventing the cooling medium from flowing into the gap between the stator 20 and the rotor 70, thereby improving the motor's operating performance.

[0183] It should be noted that this disclosure does not limit the number of the first mounting groove 212 and the sealing strip. In practical applications, technicians can set them as needed. It is understood that the number of the first mounting groove 212 and the sealing strip should be the same. By sealing one sealing strip with one first mounting groove 212, the entire end face of the stator core 21 can be sealed, effectively preventing leakage of cooling medium.

[0184] In some embodiments, the first sealing ring 31, the second sealing ring 32, and the sealing strip together form an integrally molded structure.

[0185] In some embodiments of this disclosure, the first sealing ring 31, the second sealing ring 32, and multiple sealing strips together form an integrally molded structure. On one hand, this improves the overall structural strength of the sealing element 30, thus extending its service life. On the other hand, since there are no joint gaps between the first sealing ring 31 and the sealing strips, and between the second sealing ring 32 and the sealing strips, the sealing performance of the entire sealing element 30 is improved. Furthermore, since no additional assembly steps are required between the first sealing ring 31, the second sealing ring 32, and the multiple sealing strips, the motor assembly process is simplified, the assembly requirements are reduced, and the assembly efficiency of the motor is improved.

[0186] In some embodiments, the stator cooling structure further includes a first sealing ring disposed between the seal 30 and the housing 10, so that the seal 30 and the housing 10 are sealed together.

[0187] In some embodiments of this disclosure, a first sealing ring is provided between the seal 30 and the housing 10. The provision of the first sealing ring helps to improve the sealing effect between the seal 30 and the housing 10.

[0188] In some embodiments, as shown in Figures 1, 4 to 6, the housing 10 includes an end plate 13, a first side plate 14, and a second side plate 15. The end plate 13 is disposed at one end of the stator 20 away from the seal 30. The first side plate 14 and the second side plate 15 extend circumferentially along the end plate 13 and are spaced apart radially from the stator 20, with the first side plate 14 located outside the second side plate 15. The end plate 13, the first side plate 14, the seal 30, and the stator 20 enclose a first cooling chamber 51, and the end plate 13, the second side plate 15, the seal 30, and the stator 20 enclose a second cooling chamber 52.

[0189] In some embodiments of this disclosure, the housing 10 includes an end plate 13, a first side plate 14, and a second side plate 15. The end plate 13 is disposed on the side of the stator 20 away from the seal 30. The first side plate 14 and the second side plate 15 extend circumferentially along the end plate 13, are radially spaced apart from each other on the stator 20, and the first side plate 14 is located outside the second side plate 15. The housing 10 is formed by the end plate 13, the first side plate 14, and the second side plate 15.

[0190] The above configuration allows the end plate 13, the first side plate 14, the seal 30, and the stator 20 to enclose and form the first cooling chamber 51, and the end plate 13, the second side plate 15, the seal 30, and the stator 20 to enclose and form the second cooling chamber 52.

[0191] It should be noted that in some embodiments of this disclosure, there are two housings 10, which are arranged opposite to each other along the axial direction of the stator 20 to form a closed housing.

[0192] It should be noted that in some embodiments of this disclosure, the second side plate 15 can be integrally formed with the seal 30, and in some embodiments of this disclosure, the second side plate 15 can also be integrally formed with the housing 10. These features simplify the motor assembly process, reduce the motor assembly requirements, and improve the motor assembly efficiency.

[0193] In some embodiments, as shown in FIG7, the first cooling medium channel includes a cooling medium inlet channel 11 and a cooling medium outlet channel 12. The cooling medium inlet channel 11 is connected to the first sub-cooling chamber 511 and the third sub-cooling chamber 521 respectively through the second cooling medium channel 211, and the cooling medium outlet channel 12 is connected to the second sub-cooling chamber 512 and the fourth sub-cooling chamber 522 respectively.

[0194] In some embodiments of this disclosure, the cooling medium inlet channel 11 is connected to the first sub-cooling chamber 511 and the third sub-cooling chamber 521 respectively via the second cooling medium channel 211, allowing the cooling medium to enter the first sub-cooling chamber 511 and the third sub-cooling chamber 521 through the cooling medium inlet channel 11. The cooling medium outlet channel 12 is connected to the second sub-cooling chamber 512 and the fourth sub-cooling chamber 522 respectively, allowing the cooling medium in the second sub-cooling chamber 512 and the fourth sub-cooling chamber 522 to flow out through the cooling medium outlet channel 12.

[0195] In some embodiments, the motor further satisfies at least one of the following: a cooling medium inlet channel 11 is provided in at least one of the end plate 13 and the first side plate 14; and a cooling medium outlet channel 12 is provided in at least one of the end plate 13 and the first side plate 14.

[0196] In some embodiments of this disclosure, the motor further satisfies at least one of the following: the cooling medium inlet channel is directly integrated into at least one of the end plate 13 and the first side plate 14, and the cooling medium outlet channel is directly integrated into at least one of the end plate 13 and the first side plate 14. This not only avoids inconvenience in pipe connection but also allows the cooling medium inlet channel and the cooling medium outlet channel to be as close as possible to the cooling chamber 50, thereby improving the cooling effect.

[0197] It should be noted that in some embodiments of this disclosure, the cooling medium inlet channel and the cooling medium outlet channel may be provided only on the end plate 13, or only on the first side plate 14, or both on the end plate 13 and the first side plate 14. This disclosure does not impose excessive limitations on some embodiments; in practical applications, those skilled in the art can configure them as needed.

[0198] In some embodiments, a cooling medium inlet channel 11 is disposed on an end plate 13, and the cooling medium inlet channel 11 includes an inlet and a first outlet. The inlet is configured to communicate with an external cooling device. The first outlet communicates with a second cooling medium channel 211.

[0199] In some embodiments of this disclosure, the liquid inlet is connected to an external circulating cooling device to achieve circulation of the cooling medium, thereby continuously cooling the stator 20, improving the cooling efficiency of the stator 20, and ensuring the reliability of the motor. The first liquid outlet is connected to the second cooling medium channel 211 so that the cooling medium entering the channel 11 can enter the second cooling medium channel 211.

[0200] In some embodiments, a cooling medium outlet channel is disposed on the end plate 13, and the cooling medium outlet channel includes a second liquid outlet, a third connecting port, and a fourth connecting port. The second liquid outlet is configured to communicate with an external cooling device. The third connecting port and the fourth connecting port are arranged radially spaced along the stator 20. The third connecting port communicates with the second sub-cooling chamber 512, and the fourth connecting port communicates with the fourth sub-cooling chamber 522.

[0201] In some embodiments of this disclosure, the second liquid outlet is connected to an external circulating cooling device to realize the circulation of the cooling medium, which facilitates continuous cooling of the stator 20, improves the cooling efficiency of the stator 20, and thus helps to improve the reliability of the motor operation.

[0202] Furthermore, since the third connecting port is connected to the second sub-cooling chamber 512 and the fourth connecting port is connected to the fourth sub-cooling chamber 522, the cooling medium in the second sub-cooling chamber 512 can flow out through the third connecting port, and the cooling medium in the fourth sub-cooling chamber 522 can flow out through the fourth connecting port.

[0203] In some embodiments, the motor further satisfies at least one of the following: the cooling medium inlet channel 11 is a liquid inlet, and the cooling medium outlet channel 12 is a liquid outlet.

[0204] In some embodiments of this disclosure, the motor further satisfies at least one of the following: the cooling medium inlet channel 11 can be configured as a liquid inlet, and the cooling medium outlet channel 12 can be configured as a liquid outlet. This simplifies the structure of the cooling medium inlet channel 11 and the cooling medium outlet channel 12, reducing the processing difficulty of the housing 10.

[0205] For example, two liquid inlets can be provided: one liquid inlet is opened on the first side plate 14 to communicate with the first sub-cooling chamber 511, and the other liquid inlet is opened on the end plate 13 to communicate with the third sub-cooling chamber 521. Two liquid outlets can also be provided: one liquid outlet is opened on the end plate 13 and communicates with the second sub-cooling chamber 512, and the other liquid outlet is opened on the end plate 13 and communicates with the fourth sub-cooling chamber 522.

[0206] In some embodiments, the stator 20 includes a stator core 21 and a stator winding 22. The stator winding 22 is wound around the stator core 21. Along the radial direction of the stator core 21, the stator winding 22 at least partially protrudes radially outward from the stator core 21 to form a first end winding 221, and at least partially protrudes radially inward from the stator core 21 to form a second end winding 222. A cooling chamber 50 is configured to cool at least one of the first end winding 221 and the second end winding 222.

[0207] As shown in Figures 6 and 7, in some embodiments of this disclosure, the stator 20 includes a stator core 21 and a stator winding 22. The stator winding 22 is wound around the stator core 21. Along the radial direction of the stator 20, the stator winding 22 at least partially protrudes radially outward from the stator core 21 to form a first end winding 221. It is understood that the first end winding 221 is wound on the outer side of the stator core 21. Along the radial direction of the stator 20, the stator winding 22 at least partially protrudes radially inward from the stator core 21 to form a second end winding 222. It is understood that the second end winding 222 is wound on the inner side of the stator core 21. In this way, the first end winding 221 can be located within the first cooling chamber 51, allowing the cooling medium to contact the first end winding 221 and exchange heat with it, thereby reducing the temperature of the first end winding 221 and improving the cooling efficiency of the stator 20. In addition, the second end winding 222 can be located in the second cooling chamber 52, and the cooling medium can contact the second end winding 222 to exchange heat with the second end winding 222, thereby reducing the temperature of the second end winding 222 and improving the cooling efficiency of the stator 20.

[0208] In some embodiments, as shown in Figures 1 and 5, the housing 10 includes a first side plate 14 surrounding the stator core 21, and a mounting cavity 16 is provided on the side of the first side plate 14 opposite to the stator core 21. The stator 20 also includes a junction box disposed within the mounting cavity 16 and configured to be electrically connected to the stator winding 22.

[0209] In some embodiments of this disclosure, a mounting cavity 16 is provided on the side of the first side plate 14 opposite to the stator core 21, and a junction box is disposed in the mounting cavity 16 to facilitate electrical connection between the junction box and the stator winding 22. Furthermore, the above arrangement can reduce the axial dimension of the stator 20, which is beneficial for motor miniaturization.

[0210] In some embodiments, two stators 20 are provided, and the two stators 20 are provided on opposite axial sides of the rotor 70.

[0211] It should be noted that the accompanying drawings in some embodiments of this disclosure only show the case where the motor includes two stators 20 and a single rotor 70. In practical applications, the motor in some embodiments of this disclosure may also include a single stator 20 and a single rotor 70. Alternatively, the motor may also include N stators 20 and (N-1) rotors 70, where N > 2. In some embodiments of this disclosure, no excessive limitations are imposed; in practical applications, those skilled in the art can configure it as needed.

[0212] As shown in Figure 14, some embodiments of this disclosure also provide a powertrain 500, which includes the aforementioned motor 100. The powertrain 500 can be a pure electric powertrain, a hybrid powertrain, or other types, and can be equipped with any drive architecture, such as centralized drive, four-wheel drive, two-wheel drive, wheel-side drive, etc.

[0213] It should be noted that in some embodiments of this disclosure, the structure of the motor is the same as that of the motor described above, and its beneficial effects are also similar, so it will not be described in detail here.

[0214] As shown in Figures 15 and 16, some embodiments of this disclosure also provide a vehicle 1000, which includes the powertrain 500 described above, or the motor 100 described above.

[0215] It should be noted that in some embodiments of this disclosure, the structure of the powertrain is the same as that of the powertrain described above, and the structure of the motor is the same as that of the motor described above. Of course, the beneficial effects are similar, and will not be elaborated upon here.

[0216] It should be noted that the vehicles in some embodiments of this disclosure can be gasoline-powered vehicles, hybrid vehicles, or pure electric vehicles. In some embodiments of this disclosure, no excessive restrictions are placed on the type of vehicle. In practical applications, those skilled in the art can make the necessary settings as needed.

[0217] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0218] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0219] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0220] The technical solution provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A rotor (70) comprising a first magnetic part (71) and a second magnetic part (72), the first magnetic part (71) and the second magnetic part (72) being arranged at intervals along the circumference of the rotor (70), and the first magnetic part (71) and the second magnetic part (72) having opposite polarities; in, At least a portion of the coercivity of the second magnetic part (72) is less than that of the first magnetic part (71).

2. The rotor (70) according to claim 1, wherein, The second magnetic part (72) includes a first magnetic element (721) and a second magnetic element (722), wherein the coercivity of the first magnetic element (721) is less than that of the second magnetic element (722).

3. The rotor (70) according to claim 2, wherein, The second magnetic part (72) includes a plurality of first magnetic elements (721) which are spaced apart along at least one of the radial and circumferential directions of the rotor (70).

4. The rotor (70) according to claim 3, wherein, At least one of the plurality of first magnetic elements (721) is a composite magnetic element, the composite magnetic element having first sub-magnetic elements and second sub-magnetic elements with different coercivity.

5. The rotor (70) according to claim 4, wherein, The magnetic circuits of the first sub-magnetic component and the second sub-magnetic component are connected in series or in parallel.

6. The rotor (70) according to claim 4 or 5, wherein, The first submagnetic element and the second submagnetic element are disposed along at least one of the radial and circumferential directions of the rotor (70).

7. The rotor (70) according to any one of claims 4-6 further satisfies at least one of the following: the coercivity of the first sub-magnetic element is less than or equal to the coercivity of the first magnetic element (721); and the coercivity of the second sub-magnetic element is less than or equal to the coercivity of the second magnetic element (722).

8. The rotor (70) according to any one of claims 4-7, wherein, The second magnetic element (722) and the composite magnetic element are spaced apart along at least one of the radial and circumferential directions of the rotor (70).

9. The rotor (70) according to any one of claims 4-8, wherein, The first magnetic element (721) is the composite magnetic element, and the composite magnetic element and the second magnetic element (722) are arranged radially along the rotor; The rotor (70) also satisfies at least one of the following: the composite magnetic element is disposed on the radial inner side of the rotor (70), and the composite magnetic element is disposed on the radial outer side of the rotor (70).

10. The rotor (70) according to any one of claims 2-9, wherein, The second magnetic element (722) and the first magnetic element (721) are spaced apart along at least one of the radial and circumferential directions of the rotor (70).

11. The rotor (70) according to any one of claims 2-10, wherein, The second magnetic part (72) includes a plurality of second magnetic elements (722), at least one of the plurality of second magnetic elements (722) is disposed on the radial inner side of the first magnetic element (721), and at least one of the plurality of second magnetic elements (722) is disposed on the radial outer side of the first magnetic element (721).

12. The rotor (70) according to any one of claims 2-11, wherein, The first magnetic part (71) includes a third magnetic element (711), the coercivity of which is greater than or equal to the coercivity of the second magnetic element (722).

13. The rotor (70) according to claim 12, wherein, The first magnetic part (71) includes a plurality of third magnetic elements (711) disposed along at least one of the radial and circumferential directions of the rotor (70).

14. The rotor (70) according to any one of claims 1-13, wherein, The first magnetic part (71) and the second magnetic part (72) constitute a series-parallel hybrid magnetic circuit structure.

15. The rotor (70) according to any one of claims 1-14, wherein, Both the first magnetic part (71) and the second magnetic part (72) include at least one permanent magnet, which is at least one of ferrite permanent magnet, AlNiCo permanent magnet, NdFeB permanent magnet, Samarium Cobalt permanent magnet, and Iron Nitride permanent magnet.

16. The rotor (70) according to claim 15, wherein, Both the first magnetic part (71) and the second magnetic part (72) include a plurality of permanent magnets; The permanent magnet material of the first magnetic part (71) may be the same as or different from the permanent magnet material of the second magnetic part (72).

17. The rotor (70) according to claim 15 or 16, wherein, The second magnetic part (72) includes a plurality of permanent magnets, which may be made of the same or different materials.

18. The rotor (70) according to any one of claims 15-17, wherein, The permanent magnet includes at least one of a multi-segment structure and an integral structure.

19. The rotor (70) according to any one of claims 15-18, wherein, The permanent magnet is at least one of a fan-shaped structure, a trapezoidal structure, and a square structure.

20. The rotor (70) according to any one of claims 15-19 further satisfies at least one of the following: the first magnetic part (71) has a first center line, and the permanent magnets of the first magnetic part (71) are symmetrically or asymmetrically arranged along the first center line; and, The second magnetic part (72) has a second center line, and the permanent magnets of the second magnetic part (72) are arranged symmetrically or asymmetrically along the second center line.

21. The rotor (70) according to any one of claims 1-20 further includes a rotor core having a mounting groove configured to receive the first magnetic part (71) and the second magnetic part (72).

22. The rotor (70) according to claim 21, wherein, The mounting slot includes a plurality of grooves, which are spaced apart along at least one of the radial and circumferential directions of the rotor (70).

23. The rotor (70) according to claim 22, wherein, At least one permanent magnet from either the first magnetic part (71) or the second magnetic part (72) is disposed in any one of the plurality of grooves.

24. The rotor (70) according to any one of claims 21-23, wherein, The rotor core further includes a support portion (73) and a protective portion (74), wherein, The support part (73) is disposed on the radial inner side of the rotor core, and the protection part (74) is disposed on the radial outer side of the rotor core.

25. The rotor (70) according to any one of claims 1-24, comprising two rotor cores arranged sequentially along the axial direction of the rotor (70).

26. An electric motor (100), comprising: The rotor (70) according to any one of claims 1-25; The stator (20) and the rotor (70) are spaced apart along the axial direction of the motor (100).

27. The motor (100) according to claim 26 further includes a motor controller electrically connected to the stator winding (22) of the stator (20), the motor controller being configured to output an instantaneous pulse current to cause the stator winding (22) to generate a tuning magnetic field acting on the rotor (70) to change the magnetic flux through the rotor (70).

28. The motor (100) according to claim 26 or 27 further includes a stator cooling structure comprising a housing (10) configured to receive the stator (20) and the rotor (70), the housing (10) and the stator enclosing to form a cooling chamber (50), the cooling chamber (50) being configured to cool at least one of the radially outer side and the radially inner side of the stator (20); The housing (10) is provided with a first cooling medium channel, and the stator (20) is provided with a second cooling medium channel (211). The first cooling medium channel is connected to the cooling chamber (50) through the second cooling medium channel (211).

29. The motor (100) according to claim 28, wherein, The second cooling medium channel (211) is disposed in the stator core (21) of the stator (20), and the cooling medium in the second cooling medium channel (211) is configured to cool one side of the stator core (21).

30. The motor (100) according to claim 29, wherein, The second cooling medium channel (211) includes a first sub-cooling medium channel (2111), which extends radially along the stator (20) and communicates with the first cooling medium channel and the cooling chamber (50).

31. The motor (100) according to claim 30, wherein, The second cooling medium channel (211) also includes a second sub-cooling medium channel (2112). The second sub-cooling medium channel (2112) extends circumferentially along the stator (20), and the second sub-cooling medium channel (2112) is connected to the first sub-cooling medium channel (2111) and the first cooling medium channel, so that the cooling medium in the first cooling medium channel can enter the first sub-cooling medium channel (2111) through the second sub-cooling medium channel (2112).

32. The motor (100) according to claim 30 or 31, wherein, The cooling chamber (50) includes a first cooling chamber and a second cooling chamber, both of which are connected to the first sub-cooling medium channel (2111). Along the radial direction of the stator (20), the first cooling chamber (51) and the second cooling chamber (52) are spaced apart, and the first cooling chamber (51) is located outside the second cooling chamber (52); The first cooling chamber (51) is configured to cool the radially outer side of the stator (20), and the second cooling chamber (52) is configured to cool the radially inner side of the stator (20).

33. The motor (100) according to claim 32 further comprises: A cooling assembly (40) is disposed in at least one of the first cooling chamber (51) and the second cooling chamber (52), and the cooling assembly (40) can communicate the first cooling medium channel and the second cooling medium channel (211).

34. The motor (100) according to claim 33 further comprises: A sealing element (30) is formed together with the housing (10) and the stator (20) to form the first cooling chamber (51) and the second cooling chamber (52).

35. The motor (100) according to claim 34, wherein, The sealing element (30) includes a first sealing ring (31) and a second sealing ring (32), the first sealing ring (31) and the second sealing ring (32) being arranged radially apart along the stator (20) and located outside the second sealing ring (32); The first sealing ring (31) surrounds the housing (10) and the stator (20) to form the first cooling chamber (51); the second sealing ring surrounds the housing (10) and the stator (20) to form the second cooling chamber (52).

36. A powertrain (500) comprising an electric motor (100) according to any one of claims 26-35.

37. A vehicle (1000) comprising an electric motor (100) according to any one of claims 26-35, or a powertrain (500) according to claim 36.

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