Motor, power assembly and electric vehicle

Abstract

The embodiment of the invention provides a motor, a power assembly and an electric vehicle, relates to the technical field of motors, and aims to solve the problem that internal stress distribution and performance of a rotor core are difficult to balance. In the motor, a rotor iron core of a rotor comprises a plurality of iron core sections, and the plurality of iron core sections are laminated and distributed along the axial direction of the rotor. Each iron core section comprises a plurality of rotor punching sheets and a plurality of magnetic steel grooves, and the plurality of rotor punching sheets are arranged in multiple layers along the axial direction of the rotor. And each magnetic steel groove penetrates through the plurality of rotor punching sheets along the axial direction of the rotor. And each magnetic steel groove is used for accommodating one magnetic steel. Wherein the rotor punching sheets in the same layer of rotor punching sheets in each iron core section are made of the same material, and two adjacent layers of rotor punching sheets in each iron core section are made of different materials. Each iron core section is formed by stacking two different materials, and one piece of magnetic steel is embedded in each magnetic steel groove of the iron core section, so that the fitting degree of the magnetic steel and the inner wall of the magnetic steel groove is higher, the performance of the rotor iron core is improved, and meanwhile, the stress in the rotor iron core is uniformly distributed.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more particularly to an electric motor, powertrain, and electric vehicle. Background Technology

[0002] In electric motors, the rotor core is often formed by stacking multiple identical rotor laminations, which limits the potential for improving the mechanical strength and electromagnetic performance of the rotor core. Traditional manufacturing methods, which combine and stack core segments of different materials, are prone to uneven stress distribution within the rotor core and also make it difficult to ensure a uniform distribution of the magnetic field within the rotor core. Summary of the Invention

[0003] This application provides an electric motor, powertrain, and electric vehicle to improve the uniformity of stress distribution within the rotor core while enhancing the performance of the rotor core.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] A first aspect of this application provides an electric motor, the rotor of which includes a rotor core. The rotor core includes multiple core segments stacked along the axial direction of the rotor. Each core segment includes multiple rotor laminations and multiple magnet slots. The multiple rotor laminations are arranged in multiple layers along the axial direction of the rotor. Each magnet slot extends through multiple rotor laminations along the axial direction of the rotor, and each magnet slot is used to accommodate one magnet. The rotor laminations in the same layer within each core segment are made of the same material, while adjacent layers of rotor laminations within each core segment are made of different materials.

[0006] In the motor provided in this application, the rotor core is formed by stacking multiple core segments. Each core segment only bears the centrifugal load of the corresponding magnet. The stress transmission path is shorter and independent, avoiding stress superposition inside the rotor core, which is beneficial to improving the stress uniformity inside the rotor core.

[0007] The rotor laminations in the same layer of rotor laminations within each core segment are made of the same material. This facilitates processing and assembly, reduces manufacturing costs, and eliminates stress concentration caused by differences in mechanical properties within the same layer of rotor laminations. This ensures uniform stress transmission within the same layer of rotor laminations and stabilizes the stress transmission boundary conditions between adjacent layers of rotor laminations, thereby improving the uniformity of the overall stress distribution of the rotor.

[0008] The use of different materials for adjacent rotor laminations within each core segment ensures that each segment deforms only in relation to its corresponding magnet, preventing localized stress concentration caused by the mutual constraint of different deformations within the monolithic rotor core. In practical applications, selecting rotor laminations made of materials with desired properties improves the mechanical strength, electromagnetic properties, and other performance characteristics of the rotor core. Therefore, this application enhances both the performance of the rotor core and the uniformity of stress distribution within it.

[0009] In one embodiment, one of the rotor laminations in each core segment is made of an amorphous alloy, and the other rotor lamination in the two adjacent rotor laminations is made of silicon steel.

[0010] In the motor provided in this application, the rotor core is designed by alternating and mixing multiple layers of silicon steel rotor laminations and multiple layers of amorphous alloy rotor laminations in each core segment. This allows the rotor core to simultaneously possess the high tensile strength and low loss characteristics of amorphous alloys, as well as the ductility and strength of silicon steel, thereby effectively balancing the overall mechanical strength and electromagnetic performance of the rotor.

[0011] In one embodiment, along the radial direction of the rotor, the magnets in the core section are opposite to at least one type of rotor lamination in the core section, so as to improve the uniformity of stress distribution of the centrifugal stress of the magnets acting on the radial side of the rotor laminations of different materials, which is beneficial to improving the reliability of the rotor.

[0012] In some scenarios, the magnet is placed opposite the rotor lamination made of a material with poor plasticity. The centrifugal stress of the magnet acts on the radial side of the rotor lamination made of that material. This prevents the rotor lamination made of that material from breaking due to uneven stress distribution caused by the centrifugal stress of the magnet acting on a local area of ​​the rotor lamination made of a material with poor plasticity. This helps to improve the reliability and stress distribution uniformity of the rotor.

[0013] In one embodiment, the number of rotor laminations in the core section is an even number, so as to improve the performance of the rotor core while increasing the uniformity of stress distribution inside the rotor core.

[0014] In one embodiment, the length of the magnet in the core section along the rotor axis is an integer multiple of the sum of the lengths of two adjacent rotor laminations in the core section. This ensures that the magnet in the core section is opposite to the rotor laminations of the two materials in the core section, preventing the centrifugal stress of the magnet from acting on the local parts of the rotor laminations of the two materials, which would cause the rotor laminations of the two materials to break due to uneven stress distribution. This is beneficial to improving the reliability and stress distribution uniformity of the rotor.

[0015] In one embodiment, the two layers of rotor laminations between two adjacent iron core segments along the rotor axis are made of different materials, which is beneficial to improving the uniformity of the magnetic field and stress distribution inside the rotor.

[0016] In one embodiment, the number of rotor laminations in the core section is an odd number of layers, so as to improve the performance of the rotor core while increasing the uniformity of stress distribution inside the rotor core.

[0017] In one embodiment, the two layers of rotor laminations between two adjacent iron core sections along the rotor axis are made of the same material, which helps to reduce the assembly difficulty of the magnets and improve assembly efficiency.

[0018] In one embodiment, in two adjacent core segments, the ratio of the lengths of rotor laminations of different material layers in one core segment is the same as the ratio of the lengths of rotor laminations of different material layers in the other core segment. This is beneficial for the uniform distribution of rotor laminations of different material layers within the rotor core, thereby improving the uniformity of stress distribution in the rotor.

[0019] In one embodiment, the multi-layer rotor laminations of the same material in each core segment have the same length along the rotor's axial direction, which helps to improve the uniformity of the rotor's stress, facilitates assembly, and improves assembly efficiency.

[0020] In one embodiment, the multi-layer rotor laminations of the same material in two adjacent core segments have the same length along the rotor axis, which helps to improve the uniformity of the rotor's stress, facilitates assembly, and improves assembly efficiency.

[0021] In one embodiment, multiple core segments of the same length are arranged along the rotor's axial direction. By stacking core segments of the same length sequentially, the stress distribution of the rotor is more uniform and the manufacturing cost is lower.

[0022] In one embodiment, the magnets in multiple core segments along the rotor axis are of the same length. Having magnets of the same length embedded in different core segments ensures uniform force distribution on the rotor and facilitates assembly, while also promoting a uniform magnetic field distribution.

[0023] A second aspect of this application provides a powertrain including a reducer and the aforementioned motor, the motor being used to drive the wheels of an electric vehicle via the reducer.

[0024] The powertrain provided in this application includes the aforementioned motor. Therefore, the powertrain provided in this application solves the same technical problem and has the same technical effect as the motor in the aforementioned technical solution, and will not be repeated here.

[0025] A third aspect of this application provides an electric vehicle including wheels and the aforementioned powertrain for driving the wheels.

[0026] The electric vehicle provided in this application includes the aforementioned powertrain. Therefore, the electric vehicle provided in this application solves the same technical problem and has the same technical effect as the powertrain of the aforementioned technical solution, and will not be repeated here. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an electric vehicle provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of a powertrain provided in an embodiment of this application;

[0029] Figure 3 This application provides a schematic diagram of the structure of an electric motor according to an embodiment of the present application.

[0030] Figure 4 A schematic diagram of a rotor provided in an embodiment of this application;

[0031] Figure 5 for Figure 4 A schematic diagram of the structure of multiple iron core segments;

[0032] Figure 6 This is a schematic diagram of the structure of a core segment provided in an embodiment of this application;

[0033] Figure 7 An exploded view of a core segment provided in an embodiment of this application;

[0034] Figure 8 One of the partial structural schematic diagrams of a rotor core provided in this application embodiment;

[0035] Figure 9 A second partial structural schematic diagram of a rotor core provided in an embodiment of this application;

[0036] Figure 10 The third schematic diagram of a partial structure of a rotor core provided in this application embodiment;

[0037] Figure 11 Fourth partial structural schematic diagram of a rotor core provided for an embodiment of this application;

[0038] Figure 12 One of the partial structural schematic diagrams of another rotor core provided in the embodiments of this application;

[0039] Figure 13 A second partial structural schematic diagram of another rotor core provided in an embodiment of this application;

[0040] Figure 14 This is the third partial structural schematic diagram of another rotor core provided in the embodiments of this application.

[0041] Figure label:

[0042] 1000-Electric vehicle; 100-Powertrain; 200-Wheel; 300-Power battery; 10-Motor; 20-Reducer; 1-Rotor; 11-Rotor core; 111-Core segment; 1111-Rotor lamination; 1112-Through hole; 112-Magnet slot; 12-Magnet; 2-Stator; 21-Stator core; 22-Stator winding; 01-First layer rotor lamination; 02-Second layer rotor lamination; 03-Third layer rotor lamination. Detailed Implementation

[0043] In the accompanying drawings of the embodiments of this application, solid structures such as parts and components are represented by guide lines; hollow structures such as openings, holes, spaces, and cavities are represented by guide lines with arrows.

[0044] In the rotor of an electric motor, the rotor core is often formed by stacking multiple identical rotor laminations. This makes it difficult to effectively improve the mechanical strength and electromagnetic performance of the rotor core, thus limiting the improvement of motor performance. If core segments of different materials are combined and stacked, uneven stress distribution inside the rotor core is likely to occur, and it is also difficult to ensure a uniform distribution of the magnetic field in the rotor core.

[0045] Based on this, this application provides an electric motor in which each core segment of the rotor core is formed by stacking two different materials, and a magnet is embedded in each magnet slot of the core segment. Therefore, the magnet has a higher degree of fit with the inner wall of the magnet slot, thereby improving the performance of the rotor core and the uniformity of stress distribution inside the rotor core.

[0046] The motor provided in this application is used in powertrains and electric vehicles with powertrains, which helps to improve the overall vehicle performance.

[0047] The electric vehicle provided in this application is a wheeled device driven or towed by a power unit. In some embodiments, the electric vehicle includes pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, or plug-in hybrid electric vehicles, etc.

[0048] Among them, pure electric vehicles are called battery electric vehicles, abbreviated as BEV. Hybrid electric vehicles are called hybrid electric vehicles, abbreviated as HEV. Range-extended electric vehicles are called range-extended electric vehicles, abbreviated as REEV. Plug-in hybrid electric vehicles are called plug-in hybrid electric vehicles, abbreviated as PHEV.

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0050] Figure 1 This is a structural schematic diagram of an electric vehicle provided as an embodiment of this application. (Refer to...) Figure 1 The electric vehicle 1000 includes a powertrain 100 and wheels 200. The powertrain 100 is used to drive the wheels 200 to rotate, thereby enabling the electric vehicle 1000 to move.

[0051] The electric vehicle 1000 also includes a power battery 300. The power battery 300 is used to supply power to the powertrain 100, and is also referred to as a battery pack. The powertrain 100 is used to convert the electrical energy provided by the power battery 300 into mechanical energy to drive the wheels 200 to rotate, thereby enabling the electric vehicle 1000 to move.

[0052] Figure 2 This is a schematic diagram of a powertrain provided in an embodiment of this application. (Refer to...) Figure 2 The part shown in the dashed box is the powertrain 100. The powertrain 100 includes a motor 10 and a reducer 20. The motor 10 is used to convert electrical energy into mechanical energy, and then transmit the mechanical energy to the reducer 20. The reducer 20 converts the mechanical energy output by the motor 10 into a greater torque output to drive the wheels 200 to rotate.

[0053] Figure 3 This is a schematic diagram of the structure of an electric motor provided in an embodiment of this application. (Refer to...) Figure 3 The motor 10 includes a rotor 1 and a stator 2. The rotor 1 passes through the center hole of the stator 2 along direction A. The stator 2 surrounds the rotor 1 along direction B. Direction A is the axial direction of the motor 10, and direction B is the circumferential direction of the motor 10.

[0054] The rotor 1 includes a rotor core 11 and magnets, with the magnets mounted on the rotor core 11. The magnets are... Figure 3 The image is not shown. The stator 2 includes a stator core 21 and a stator winding 22, which is mounted on the stator core 21.

[0055] The stator 2 and rotor 1 work together to convert electrical energy into mechanical energy. When the stator winding 22 is energized, it generates a rotating magnetic field. This rotating magnetic field interacts with the inherent magnetic field of the magnets in the rotor 1 to generate an electromagnetic force. This electromagnetic force acting on the rotor 1 is converted into driving torque, which drives the rotor 1 to rotate, thereby realizing the conversion of electrical energy into mechanical energy.

[0056] The motor shaft 3 passes through the center hole of the rotor 1 along direction A. The motor shaft 3 is fixed to the center hole of the rotor core 11, so the motor shaft 3 rotates together with the rotor 1. The motor shaft 3 is used to transmit the rotational torque generated by the rotor 1, thereby outputting mechanical energy.

[0057] The motor 10 can take various forms. In some embodiments, the motor 10 is an embedded permanent magnet motor, also known as an IPM. In other embodiments, the motor 10 can be other types of motors, and this application does not impose any special restrictions on them.

[0058] The above description uses the example of motor 10 as the drive motor of electric vehicle 1000. The motor 10 of this application is also applied in the fields of home appliances and industrial servo motors. In some embodiments, the motor 10 of this application is applied in the fields of electric air conditioner compressor motors. This application does not impose any special limitations on this. Below, this application will further describe the embodiments of this application in detail with reference to the accompanying drawings, using motor 10 as an example of a drive motor.

[0059] In this application, the axial direction of the motor 10, the axial direction of the rotor 1, and the axial direction of the rotor core 11 are the same, and are referred to by the letter A. The circumferential direction of the motor 10, the circumferential direction of the rotor 1, and the circumferential direction of the rotor core 11 are the same, and are referred to by the letter B. The radial direction of the motor 10, the radial direction of the rotor 1, and the radial direction of the rotor core 11 are the same, and are referred to by the letter C.

[0060] Figure 4 This is a schematic diagram of a rotor provided in an embodiment of this application. Figure 5 for Figure 4 A structural schematic diagram of multiple iron core segments. (Refer to...) Figure 4 and Figure 5 The rotor core 11 comprises multiple core segments 111, which are stacked and distributed along direction A. The motor shaft 3 passes through the central holes of the multiple core segments 111 along direction A. The central holes of the multiple core segments 111 are as follows: Figure 5 The letter O in the middle refers to.

[0061] Figure 6 This is a schematic diagram of the structure of an iron core segment provided in an embodiment of this application. Each iron core segment 111 includes a plurality of magnetic steel grooves 112, each magnetic steel groove 112 extending through the iron core segment 111 along direction A, and each magnetic steel groove 112 is used to accommodate a magnet 12.

[0062] Figure 6 In one embodiment, the multiple magnets 12 within each core segment 111 are arranged in a double V-shape. In other embodiments of this application, the multiple magnets 12 within each core segment 111 are arranged in a straight line, V-shape, or other forms. This application does not impose specific restrictions on the distribution of the magnets 12.

[0063] Figure 7 An exploded view of a core segment provided in an embodiment of this application. (Refer to...) Figure 6 and Figure 7 Each core segment 111 includes multiple rotor laminations 1111, which are arranged in multiple layers along direction A.

[0064] Each rotor lamination 1111 includes a through hole 1112 through which a magnet 12 passes. Each magnet slot 112 is formed by a series of through holes 1112 on multiple rotor laminations 1111 arranged along direction A. Therefore, each magnet slot 112 passes through multiple rotor laminations 1111 along direction A. Since each magnet slot 112 is used to accommodate one magnet 12, each magnet 12 also passes through multiple rotor laminations 1111.

[0065] Multiple core segments 111 are stacked and fixed along direction A by adhesive bonding or other fixing methods. Similarly, multiple rotor laminations 1111 in each core segment 111 are stacked and fixed along direction A by adhesive bonding or other fixing methods.

[0066] In actual installation, there are two methods for installing the magnets 12. One method involves embedding the magnet 12 into each magnet slot 112 of each core segment 111, and then connecting multiple core segments 111 together. The other method involves first stacking and fixing multiple core segments 111, and then embedding the magnets 12 segment by segment into the corresponding magnet slots 112. The magnets within the magnet slots 112 are fixed to the multi-layer rotor laminations 1111 on the inner wall of the magnet slots 112 through methods such as potting, spring pressing, and injection molding.

[0067] Currently, rotor cores 11 are mostly formed by stacking multiple rotor laminations 1111 made of silicon steel, which limits the potential for improving the mechanical strength and electromagnetic performance of the rotor core 11. If core segments 111 of different materials are combined and stacked, uneven stress distribution within the rotor core 11 is likely to occur, and it is also difficult to ensure a uniform distribution of the magnetic field within the rotor core 11. To solve this problem, this application uses each magnet slot 112 of each core segment 111 to accommodate one magnet 12. The rotor laminations 1111 in the same layer of each core segment 111 are made of the same material, while adjacent layers of rotor laminations 1111 in each core segment 111 are made of different materials.

[0068] Under the centrifugal force generated by the rotation of rotor 1, the centrifugal stress of magnet 12 is transmitted to rotor core 11. If an integral rotor core is used, due to manufacturing errors and assembly stress of the integral rotor core, stress superposition occurs on the stress transmission path from magnet 12 to rotor core 11, resulting in local stress peaks.

[0069] In this application, the rotor core 11 is formed by stacking multiple core segments 111. Each core segment 111 only bears the centrifugal load of the corresponding magnet 12. The stress transmission path is shorter and independent, avoiding stress superposition inside the rotor core 11, which is beneficial to improving the stress uniformity in the circumferential and axial directions.

[0070] Because the rotor laminations 1111 in the same layer of rotor laminations 1111 within each core segment 111 are made of the same material, while the materials of adjacent layers of rotor laminations 1111 within each core segment 111 are different, each core segment 111 only undergoes deformation matching with the corresponding magnet 12. This avoids the mutual constraint of different deformations within the integral rotor core, thus preventing localized stress concentration. In practical applications, by selecting rotor laminations 1111 made of materials with desired performance, the mechanical strength, electromagnetic properties, and other properties of the rotor core 11 can be improved. Therefore, the motor 10 provided in this application helps to improve the performance of the rotor core 11 while simultaneously increasing the uniformity of stress distribution within the rotor core 11.

[0071] In each core segment 111, the rotor laminations 1111 in the same layer are made of the same material. This facilitates processing and assembly, reduces manufacturing costs, and eliminates stress concentration caused by differences in mechanical properties within the same layer of rotor laminations 1111. This ensures uniform stress transmission within the same layer of rotor laminations 1111 and stabilizes the stress transmission boundary conditions between adjacent layers of rotor laminations 1111, thereby improving the uniformity of the overall stress distribution of the rotor.

[0072] When embedding the magnet, multiple core segments 111 are used to individually adjust the interference fit between each core segment 111 and the magnet. The assembly stress is evenly distributed to each core segment 111, avoiding excessive local interference stress caused by cumulative dimensional errors during overall assembly and reducing the risk of excessive local stress.

[0073] In addition, compared with integral magnets, each core segment 111 corresponds to a magnet 12, which cuts off the axial eddy current path inside the integral magnet, which helps to reduce the heat generation of the magnet 12.

[0074] In each core segment 111, one of the adjacent rotor laminations 1111 is made of amorphous alloy, and the other of the adjacent rotor laminations 1111 is made of silicon steel.

[0075] Amorphous alloys, also known as amorphous steels, are multi-element alloy solid materials obtained through rapid cooling or other methods to suppress crystallization. They exhibit a lack of long-range ordered crystal structure at room temperature and possess glassy or metallic glass-like characteristics. Amorphous alloys are characterized by high strength, high hardness, low iron loss, and good tensile strength. However, they have poor plasticity and are prone to fracture under the centrifugal force of magnets.

[0076] Silicon steel refers to silicon alloy steel containing 1.0% to 4.5% silicon and less than 0.08% carbon. Silicon steel has characteristics such as high magnetic permeability, low coercivity, and high resistivity.

[0077] By using an alternating mixed and stacked design of multi-layer silicon steel rotor laminations 1111 and multi-layer amorphous alloy rotor laminations 1111 in each core segment 111, the rotor core 11 can simultaneously possess the high tensile strength and low loss characteristics of amorphous alloys as well as the ductility and strength of silicon steel, thus effectively balancing the overall mechanical strength and electromagnetic performance of the rotor.

[0078] In other embodiments of this application, one of the adjacent rotor laminations 1111 is made of silicon steel, and the other rotor lamination 1111 is made of materials other than amorphous alloys. Those skilled in the art can selectively design according to actual needs.

[0079] In some embodiments, along the radial direction of the rotor 1, the magnet 12 in the core section 111 is opposite to at least one type of rotor lamination 1111 in the core section 111, so as to improve the uniformity of stress distribution of the centrifugal stress of the magnet 12 on the radial side of the rotor lamination 1111 of different materials, which is beneficial to improving the reliability of the rotor.

[0080] In some scenarios, the magnet 12 is positioned opposite a rotor lamination 1111 made of a material with poor plasticity. The centrifugal stress of the magnet 12 acts on the radial side of the rotor lamination 1111 made of this material. This prevents the rotor lamination 1111 from breaking due to uneven stress distribution caused by the centrifugal stress of the magnet 12 acting on a local area of ​​the rotor lamination 1111 made of a material with poor plasticity. This helps to improve the reliability and stress distribution uniformity of the rotor 1.

[0081] In each core segment 111, in a scenario where one layer of rotor laminations 1111 is made of amorphous alloy and the other layer is made of silicon steel, the magnet 12 faces the amorphous alloy rotor laminations 1111. The centrifugal stress of the magnet 12 acts on the radial side of the amorphous alloy rotor laminations 1111, preventing the amorphous alloy rotor laminations 1111 from breaking due to uneven stress distribution caused by the centrifugal stress of the magnet 12 acting locally on the amorphous alloy rotor laminations 1111. This is beneficial for improving the reliability and stress distribution uniformity of the rotor 1. Therefore, this application utilizes the low-loss characteristics of amorphous materials while simultaneously solving the problem of stress-induced breakage of the amorphous alloy rotor laminations 1111 caused by the compressive stress of the magnet 12 under high-speed rotation of the rotor 1.

[0082] Below, this application will describe in detail the embodiments of this application by taking as an example that one rotor lamination 1111 in each core segment 111 is made of amorphous alloy and the other rotor lamination 1111 is made of silicon steel.

[0083] Figures 8 to 11 This is a partial structural schematic diagram of a rotor core 11 provided in an embodiment of this application. Figures 8 to 11 In the illustrated embodiment, the number of rotor laminations in each core segment 111 is an even number.

[0084] In some embodiments, the length of the magnet in the core segment 111 along direction A is an integer multiple of the sum of the lengths of the two adjacent rotor laminations in the core segment 111, to ensure that the magnet is opposite to the rotor lamination made of amorphous alloy material, and to prevent the centrifugal stress of the magnet 12 from acting on the local part of the rotor lamination made of amorphous alloy material, which would cause the rotor lamination made of amorphous alloy material to break due to uneven stress distribution, thus improving the reliability and stress distribution uniformity of the rotor.

[0085] The length of the magnet 12 in the core section 111 along direction A is an integer multiple of the sum of the lengths of the two adjacent rotor laminations in the core section 111, which also enhances the regularity of the rotor structure and optimizes the stress transmission path.

[0086] Reference Figure 8 The diagram shows the smallest stacked unit of the rotor core, which includes two layers of rotor laminations: a first rotor lamination 01 and a second rotor lamination 02. The rotor laminations in the first rotor lamination 01 are made of silicon steel, while the rotor laminations in the second rotor lamination 02 are made of amorphous alloy.

[0087] The ratio of the length of the first layer rotor lamination 01 along direction A to the length of the second layer rotor lamination 02 along direction A can be selectively designed according to actual needs.

[0088] In some embodiments, the ratio of the length of the first layer rotor lamination 01 along direction A to the length of the second layer rotor lamination 02 along direction A is greater than 1.

[0089] In some embodiments, the ratio of the length of the first layer rotor lamination 01 along direction A to the length of the second layer rotor lamination 02 along direction A is less than 1.

[0090] In some embodiments, the ratio of the length of the first layer rotor lamination 01 along direction A to the length of the second layer rotor lamination 02 along direction A is equal to 1.

[0091] Reference Figure 9 The diagram shows three core segments 111. Each core segment 111 includes two layers of rotor laminations. The distribution of the two layers of rotor laminations in each core segment 111 is as follows: Figure 8 In the smallest stacked unit, the two layers of rotor laminations are distributed in the same way.

[0092] The three core segments 111 are designated by the letters a, b, and c. Specifically, the two rotor laminations of core segment 111 referred to by a are designated by the letters a1 and a2, respectively; the two rotor laminations of core segment 111 referred to by b are designated by the letters b1 and b2, respectively; and the two rotor laminations of core segment 111 referred to by c are designated by the letters c1 and c2, respectively.

[0093] In some embodiments, the two layers of rotor laminations between two adjacent core segments 111 along direction A are made of different materials. (Refer to...) Figure 9 The rotor lamination layer referred to in a2 is made of a different material than the rotor lamination layer referred to in b1. The rotor lamination layer referred to in b2 is made of a different material than the rotor lamination layer referred to in c1.

[0094] exist Figure 9 In the embodiment shown, the length of the magnet 12 within the core segment 111 along direction A is equal to the sum of the lengths of two adjacent rotor laminations within the core segment 111. (Refer to...) Figure 9 Along the C direction, the magnets 12 in each core segment 111 are opposite to the two layers of rotor laminations in the core segment 111, so as to improve the uniformity of stress distribution on the radial side of the two layers of rotor laminations caused by the centrifugal stress of the magnets 12, which is beneficial to improving the reliability of the rotor.

[0095] and Figure 9 The difference between the given embodiments is that, Figure 10 In the given embodiment, each core segment 111 includes four layers of rotor laminations. Each core segment 111 includes two... Figure 8 The smallest stacked unit shown is two smallest stacked units stacked along direction A.

[0096] exist Figure 10In the embodiment shown, the length of the magnet 12 within the core segment 111 along direction A is twice the sum of the lengths of the two adjacent rotor laminations within the core segment 111. (Refer to...) Figure 10 Along the C direction, the magnets 12 in each core segment 111 are opposite to the four layers of rotor laminations, so as to improve the uniformity of stress distribution on the radial side of the four layers of rotor laminations caused by the centrifugal stress of the magnets 12, which is beneficial to improving the reliability of the rotor.

[0097] In this context, the four layers of rotor laminations in core segment 111, referred to as 'a', are identified by the letters a1, a2, a3, and a4. The rotor laminations referred to as a1 and a3 are made of silicon steel. The rotor laminations referred to as a2 and a4 are made of amorphous alloy.

[0098] The four layers of rotor laminations in core segment 111 referred to by b are identified by the letters b1, b2, b3, and b4. The rotor laminations referred to by b1 and b3 are made of silicon steel. The rotor laminations referred to by b2 and b4 are made of amorphous alloy.

[0099] The four layers of rotor laminations in core segment 111, referred to as "c", are identified by the letters c1, c2, c3, and c4. The rotor laminations referred to as c1 and c3 are made of silicon steel. The rotor laminations referred to as c2 and c4 are made of amorphous alloy.

[0100] and Figure 10 The difference between the given embodiments is that, Figure 11 In the given embodiment, each core segment 111 includes six layers of rotor laminations, and each core segment 111 includes three minimum stacked units, which are stacked along direction A.

[0101] exist Figure 11 In the embodiment shown, the length of the magnet 12 within the core segment 111 along direction A is three times the sum of the lengths of the two adjacent rotor laminations within the core segment 111. (Refer to...) Figure 11 Along the C direction, the magnets 12 in each core segment 111 are opposite to the six layers of rotor laminations, so as to improve the uniformity of stress distribution on the radial side of the six layers of rotor laminations caused by the centrifugal stress of the magnets 12, which is beneficial to improving the reliability of the rotor.

[0102] In this context, the six layers of rotor laminations in core segment 111, referred to as 'a', are identified by the letters a1, a2, a3, a4, a5, and a6. The rotor laminations referred to as a1, a3, and a5 are made of silicon steel. The rotor laminations referred to as a2, a4, and a6 are made of amorphous alloy.

[0103] The six layers of rotor laminations in core segment 111, referred to as b, are identified by the letters b1, b2, b3, b4, b5, and b6. The rotor laminations referred to as b1, b3, and b5 are made of silicon steel. The rotor laminations referred to as b2, b4, and b6 are made of amorphous alloy.

[0104] The four layers of rotor laminations in core segment 111, referred to as "c," are identified by the letters c1, c2, c3, c4, c5, and c6. The rotor laminations referred to as c1, c3, and c5 are made of silicon steel. The rotor laminations referred to as c2, c4, and c6 are made of amorphous alloy.

[0105] In addition to the above Figures 9 to 11 In addition to the given embodiments, in other embodiments of this application, the length of the magnet 12 in the core segment 111 along direction A is 4 times, 5 times, 6 times, etc., the sum of the lengths of the two adjacent rotor laminations in the core segment 111. This application does not impose any special restrictions on this.

[0106] In addition, the above Figures 9 to 11 In the given embodiment, the positions of the silicon steel rotor lamination and the amorphous alloy rotor lamination in two adjacent rotor lamination layers can be interchanged, and their arrangement is the same as that in the above embodiment, so it will not be repeated here.

[0107] Figures 12 to 14 This is a partial structural schematic diagram of another rotor core provided in an embodiment of this application. Figures 12 to 14 In the illustrated embodiment, the number of rotor laminations in each core segment 111 is an odd number.

[0108] Reference Figure 12 The smallest stacked unit of the rotor core 11 is shown, which includes three layers of rotor laminations: a first layer rotor lamination 01, a second layer rotor lamination 02, and a third layer rotor lamination 03. The rotor laminations in the first layer rotor lamination 01 and the third layer rotor lamination 03 are made of silicon steel, while the rotor laminations in the second layer rotor lamination 02 are made of amorphous alloy.

[0109] Reference Figure 13 The diagram shows three core segments 111. Each core segment 111 includes three layers of rotor laminations. The distribution of the three layers of rotor laminations in each core segment 111 is as follows: Figure 13 The three rotor laminations in the smallest stacked unit are distributed in the same way.

[0110] The three core segments 111 are designated by the letters a, b, and c. Specifically, the three layers of rotor laminations in core segment 111 designated by a are designated by the letters a1, a2, and a3. The two layers of rotor laminations in core segment 111 designated by b are designated by the letters b1, b2, and b3. The two layers of rotor laminations in core segment 111 designated by c are designated by the letters c1, c2, and c3.

[0111] In some embodiments, the two layers of rotor laminations between two adjacent core segments 111 along the rotor's axial direction are made of the same material. (Refer to...) Figure 13 The rotor lamination layer referred to in a3 is made of the same material as the rotor lamination layer referred to in b1, which is silicon steel. The rotor lamination layer referred to in b3 is made of the same material as the rotor lamination layer referred to in c1, which is silicon steel.

[0112] exist Figure 13 In the embodiment shown, along the C direction, the magnet 12 in each core segment 111 is opposite to a layer of rotor lamination made of amorphous alloy material in the core segment 111, so as to improve the uniformity of stress distribution on the radial side of the rotor lamination made of amorphous alloy material by the centrifugal stress of the magnet 12, which is beneficial to improving the reliability of the rotor.

[0113] Since the amorphous alloy rotor lamination is located between two silicon steel rotor laminations, the assembly difficulty of the embedded magnet 12 is reduced, which in turn helps to improve assembly efficiency.

[0114] and Figure 13 The difference between the given embodiments is that, Figure 14 In the given embodiment, each core segment 111 includes five layers of rotor laminations. The four layers of rotor laminations in the core segment 111 referred to as 'a' are represented by the letters a1, a2, a3, a4, and a5, respectively. The rotor laminations referred to as a1, a3, and a5 are made of silicon steel. The rotor laminations referred to as a2 and a4 are made of amorphous alloy.

[0115] The four layers of rotor laminations in core segment 111, referred to as b, are identified by the letters b1, b2, b3, b4, and b5. The rotor laminations referred to as b1, b3, and b5 are made of silicon steel. The rotor laminations referred to as b2 and b4 are made of amorphous alloy.

[0116] The four layers of rotor laminations in core segment 111, referred to as "c", are identified by the letters c1, c2, c3, c4, and c5. The rotor laminations referred to by c1, c3, and c5 are made of silicon steel. The rotor laminations referred to by c2 and c4 are made of amorphous alloy.

[0117] Reference Figure 14 Along the C direction, the magnet 12 in each core segment 111 is opposite to the rotor lamination made of amorphous alloy and a portion of the rotor laminations, so as to improve the uniformity of stress distribution of the centrifugal stress of the magnet 12 on the radial side of the amorphous alloy rotor laminations, which is beneficial to improving the reliability of the rotor.

[0118] Furthermore, since the rotor laminations at both ends of each core segment 111 along direction A are made of silicon steel, the assembly difficulty of the magnet 12 is reduced when it is embedded, which in turn helps to improve assembly efficiency.

[0119] In addition to the above Figures 12 to 14 In addition to the given embodiments, in other embodiments of this application, the number of rotor laminations in the core section 111 is 7, 9, or 11 layers, and this application does not impose any special restrictions on this.

[0120] In some embodiments, refer to Figures 8 to 14 In two adjacent core segments 111, the ratio of the lengths of rotor laminations of different material layers in one core segment 111 is the same as the ratio of the lengths of rotor laminations of different material layers in the other core segment 111. This is beneficial for the uniform distribution of rotor laminations of different material layers in the rotor core 11, thereby improving the uniformity of stress distribution in the rotor.

[0121] The ratio of the lengths of rotor laminations of different material layers in the core section 111 refers to the length of the multi-layer rotor lamination made of silicon steel in the core section 111 along direction A and the length of the multi-layer rotor lamination made of amorphous alloy in the core section 111 along direction A.

[0122] by Figure 9 Taking the given embodiment as an example, in the core segment 111 referred to by a, the ratio of the length of the rotor lamination layer a1 along the A direction to the length of the rotor lamination layer a2 along the A direction is K1. In the core segment 111 referred to by b, the ratio of the length of the rotor lamination layer b1 along the A direction to the length of the rotor lamination layer b2 along the A direction is K2. In the core segment 111 referred to by c, the ratio of the length of the rotor lamination layer c1 along the A direction to the length of the rotor lamination layer c2 along the A direction is K3. K1, K2, and K3 are the same.

[0123] In some embodiments, refer to Figures 8 to 14 In each core segment 111, the multi-layer rotor laminations of the same material have the same length along the A direction, which helps to improve the uniformity of the rotor's stress, facilitates assembly, and improves assembly efficiency.

[0124] by Figure 10In the given embodiment, taking a core segment 111 as an example, the length of the rotor lamination layer referred to by a1 along the A direction is the same as the length of the rotor lamination layer referred to by a3 along the A direction. The length of the rotor lamination layer referred to by a2 along the A direction is the same as the length of the rotor lamination layer referred to by a4 along the A direction.

[0125] In some embodiments, refer to Figures 9 to 14 The multi-layer rotor laminations of the same material in two adjacent iron core sections 111 have the same length along the A direction, which helps to improve the uniformity of the rotor's stress, facilitates assembly, and improves assembly efficiency.

[0126] by Figure 10 In the given embodiment, taking the core segment 111 referred to by a and b as an example, the lengths of the rotor laminations along direction A (a1, a3, b1, and b3) are all the same. Similarly, the lengths of the rotor laminations along direction A (a2, a4, b2, and b4) are also the same.

[0127] In some embodiments, refer to Figures 8 to 14 Multiple core segments 111 of the same length are stacked along direction A. By stacking core segments 111 of the same length in sequence, the stress distribution of the rotor is more uniform and the manufacturing cost is lower.

[0128] In some embodiments, refer to Figures 8 to 14 Along direction A, the magnets 12 in multiple core segments 111 have the same length. The magnets 12 embedded in different core segments 111 have the same length, which ensures that the rotor is subjected to uniform force and the magnets are evenly distributed, which facilitates assembly and also helps to ensure a uniform magnetic field distribution.

[0129] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric motor, characterized in that, The rotor of the motor includes a rotor core, which comprises multiple core segments stacked along the axial direction of the rotor. Each core segment includes multiple rotor laminations and multiple magnet slots. The multiple rotor laminations are arranged in multiple layers along the axial direction of the rotor. Each magnet slot extends through the multiple rotor laminations along the axial direction of the rotor, and each magnet slot is used to accommodate one magnet. The rotor laminations in the same layer of each core segment are made of the same material, while the rotor laminations in adjacent layers of each core segment are made of different materials.

2. The motor according to claim 1, characterized in that, In each of the core segments, one of the rotor laminations in two adjacent layers is made of amorphous alloy, and the other of the rotor laminations in two adjacent layers is made of silicon steel.

3. The motor according to claim 1 or 2, characterized in that, Along the radial direction of the rotor, the magnet in the core segment is opposite at least one rotor lamination of one material in the core segment.

4. The motor according to any one of claims 1-3, characterized in that, The number of rotor laminations in the core section is an even number.

5. The motor according to any one of claims 1-4, characterized in that, The length of the magnet in the core segment along the axial direction of the rotor is an integer multiple of the sum of the lengths of the rotor laminations in two adjacent layers of the core segment.

6. The motor according to claim 4 or 5, characterized in that, The two layers of rotor laminations between two adjacent core segments along the rotor's axial direction are made of different materials.

7. The motor according to any one of claims 1-3, characterized in that, The number of rotor laminations in the core section is an odd number.

8. The motor according to claim 7, characterized in that, Along the axial direction of the rotor, the two layers of rotor laminations between two adjacent core segments are made of the same material.

9. The motor according to any one of claims 1-8, characterized in that, In two adjacent core segments, the ratio of the lengths of rotor laminations of different material layers in one core segment is the same as the ratio of the lengths of rotor laminations of different material layers in the other core segment.

10. The motor according to any one of claims 1-9, characterized in that, In each of the core segments, the multi-layered rotor laminations of the same material have the same length along the axial direction of the rotor.

11. The motor according to any one of claims 1-10, characterized in that, In two adjacent core segments, the multi-layered rotor laminations of the same material have the same length along the axial direction of the rotor.

12. The motor according to any one of claims 1-11, characterized in that, The lengths of the plurality of core segments are the same along the axial direction of the rotor.

13. The motor according to any one of claims 1-12, characterized in that, The magnets in the plurality of core segments along the axial direction of the rotor are of the same length.

14. A powertrain, characterized in that, It includes a speed reducer and a motor according to any one of claims 1-13, the motor being used to drive the wheels of an electric vehicle via the speed reducer.

15. An electric vehicle, characterized in that, Includes wheels and the powertrain of claim 14, the powertrain being used to drive the wheels.

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