Electric machine and vehicle having the same

Abstract

This invention discloses an electric motor and a vehicle having the motor. The motor includes: a motor housing; a stator core, the stator core being mounted within the motor housing; a first torsion transmission structure disposed on the inner circumferential surface of the motor housing; and a second torsion transmission structure disposed on the outer circumferential surface of the stator core. The first torsion transmission structure is adapted to abut against the second torsion transmission structure along the circumferential direction of the motor. Both the first and second torsion transmission structures are present in an odd number. According to the motor of this invention, by providing an odd number of first torsion transmission structures and ensuring that the second torsion transmission structures abut against the first torsion transmission structures, the circumferential even-order natural frequencies of the motor housing can be significantly increased, greatly alleviating the even-order modal resonance problem caused by electromagnetic excitation of the motor housing, thereby improving the NVH performance of the motor.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and more specifically, to an electric motor and a vehicle having the electric motor. Background Technology

[0002] In the automotive drive motor industry, with the continuous application of new technologies, the power density and torque of drive motors are increasing. A drive motor consists of a motor housing and a stator mounted within it. Due to the increasing power density, the excitation electromagnetic force on the stator, especially the radial electromagnetic force, is also often increasing. This excitation energy is transferred to the motor housing through the stator, ultimately causing NVH (noise, vibration, and harshness) problems through housing vibration, severely impacting the user experience. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, the present invention proposes a motor capable of improving NVH performance.

[0004] The present invention also proposes a vehicle having the above-mentioned motor.

[0005] According to an embodiment of the present invention, the motor includes: a motor housing; a stator core, the stator core being installed inside the motor housing, a first torque transmission structure being provided on the inner circumferential surface of the motor housing, and a second torque transmission structure being provided on the outer circumferential surface of the stator core, the first torque transmission structure being adapted to abut against the second torque transmission structure along the circumferential direction of the motor, and both the first torque transmission structure and the second torque transmission structure being an odd number.

[0006] According to an embodiment of the present invention, by setting an odd number of first torque transmission structures and making the second torque transmission structure and the first torque transmission structure mutually resist each other, the circumferential even-order vibration natural frequency of the motor housing can be greatly increased, the even-order modal resonance problem generated by electromagnetic force excitation of the motor housing will be greatly alleviated, thereby improving the NVH performance of the motor.

[0007] According to some embodiments of the present invention, one of the first torsion transmission structure and the second torsion transmission structure is a torsion transmission protrusion and the other is a torsion transmission groove, wherein the torsion transmission protrusion is embedded in the torsion transmission groove.

[0008] Furthermore, the torsion-transmitting protrusion has a top and a root, the top being located within the torsion-transmitting groove, the root being opposite to the top and located outside the torsion-transmitting groove, and the circumferential width of the top being greater than the circumferential width of the root.

[0009] According to some embodiments of the present invention, the torsion transmission protrusion includes two opposing first sides for connecting the top and the root, and the included angle between the two first sides is θ, where θ is an acute angle.

[0010] Optionally, θ = k0 * 60°, k0 = 0.8 to 0.9.

[0011] According to some embodiments of the present invention, the first torque transmission structure is a torque transmission protrusion, the second torque transmission structure is a torque transmission groove, and the root is connected to the inner circumferential surface of the motor housing.

[0012] The number of torque-transmitting protrusions is m, the outer circumferential radius of the motor housing is Ra, the inner circumferential radius of the motor housing is Rb, the radial thickness of the motor housing at the torque-transmitting protrusion is Hb, and the maximum circumferential width of the top is Ha.

[0013] Hb = k1*(Ra - Rb),

[0014] Ha = 360 * k² * Hb / m

[0015] Where k1 = 1.5 to 1.6, k2 = 1.1 to 1.3.

[0016] According to some embodiments of the present invention, the torsion transmission groove includes two opposing second side surfaces and a bottom surface connecting the two second side surfaces, the radius of the connection between the second side surface and the bottom surface is Rd, the radius of the root is Rc, Rc=k3*Rd, k3=1.1~1.3.

[0017] According to some embodiments of the present invention, both the first torque transmission structure and the second torque transmission structure are torque transmission protrusions and are offset from each other along the circumference of the motor.

[0018] According to some embodiments of the present invention, a high-damping layer is further provided between the inner peripheral surface of the motor housing and the outer peripheral surface of the stator core. The high-damping layer has a clearance groove for the first torsion transmission structure and / or the second torsion transmission structure to pass through. The coefficient of thermal expansion of the high-damping layer is greater than the coefficient of thermal expansion of the motor housing.

[0019] According to some embodiments of the present invention, the torque transmission protrusion extends along the axial direction of the motor; or, the torque transmission protrusion is inclined relative to the axial direction of the motor.

[0020] According to some embodiments of the present invention, a positioning boss for positioning the stator core is provided on the inner circumferential surface of the motor housing, and the positioning boss is arranged along the circumferential direction of the motor housing.

[0021] A vehicle according to another embodiment of the present invention includes the motor described above.

[0022] The vehicle according to the present invention uses the motor described above, which results in superior NVH performance and improves user satisfaction.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] Figure 1 This is an exploded view of a motor according to an embodiment of the present invention;

[0025] Figure 2 This is a three-dimensional schematic diagram of the motor housing;

[0026] Figure 3 This is a three-dimensional schematic diagram of the stator core;

[0027] Figure 4 This is a three-dimensional schematic diagram of a high-damping layer;

[0028] Figure 5 This is a cross-sectional view of the motor housing;

[0029] Figure 6 yes Figure 5 A magnified view of a section at point A in the middle;

[0030] Figure 7 This is a cross-sectional view of the stator core;

[0031] Figure 8 yes Figure 7 A magnified view of a section at point B in the middle;

[0032] Figure 9 This is a cross-sectional view of an assembly of a motor according to an embodiment of the present invention;

[0033] Figure 10 yes Figure 9 A magnified view of a section at point C;

[0034] Figure 11 This is a top view of the motor assembly according to an embodiment of the present invention;

[0035] Figure 12 yes Figure 11 Sectional view at point DD;

[0036] Figure 13 yes Figure 12 A magnified view of a section at point E in the middle;

[0037] Figure 14 This is a schematic diagram of a motor housing and a stator core according to another embodiment of the present invention;

[0038] Figure 15This is a schematic diagram of the vehicle.

[0039] Figure label:

[0040] Vehicle 100, motor 10, stator core 1, stator groove 11, motor housing 2, liquid inlet 21, liquid outlet 22, positioning boss 23, coolant flow channel 24, first flange edge 25, second flange edge 26, first torque transmission structure 3, second torque transmission structure 4, top 51, root 52, first side 53, second side 61, bottom surface 62, high damping layer 7, clearance groove 71, installation space 8, wheel 20. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] The following is combined with Figures 1-15A detailed description is given of an electric motor 10 and a vehicle 100 having the electric motor 10 according to an embodiment of the present invention.

[0046] Reference Figures 1-3 , Figures 9-12 As shown, the motor 10 according to an embodiment of the present invention may include a stator core 1 and a motor housing 2.

[0047] The motor housing 2 has an internal cavity, and the stator core 1 is adapted to be installed in the internal cavity. The stator core 1 can be formed by stacking stator laminations, which are usually made of silicon steel sheets. A rotor (not shown) can be installed inside the stator core 1, and stator windings (not shown) are wound on the stator teeth of the stator core 1, thereby forming the stator of the motor 10.

[0048] The internal cavity of the housing can be constructed as a cylindrical part. A first torque transmission structure 3 is provided on the inner circumferential surface of the motor housing 2 (i.e., the cavity wall of the internal cavity). The stator core 1 can be constructed as a cylinder, and a second torque transmission structure 4 is provided on the outer circumferential surface of the stator core 1. Along the circumferential direction of the motor 10, the first torque transmission structure 3 is adapted to engage with the second torque transmission structure 4 to realize torque transmission between the stator core 1 and the motor housing 2.

[0049] There are an odd number of first transmission structures 3, and the number of second transmission structures 4 is the same as that of first transmission structures 3. Furthermore, each second transmission structure 4 is designed to correspond one-to-one with a first transmission structure 3. That is, when there are multiple first transmission structures 3, there are also multiple second transmission structures 4. Each first transmission structure 3 is paired with a corresponding second transmission structure 4 for a stop-and-resist mechanism. In other words, the second transmission structures 4 and the first transmission structures 3 form an odd number of a stop-and-resist mechanism pairs.

[0050] Since the NVH of motor 10 is mainly caused by the even-order radial electromagnetic force exciting the stator, which in turn excites the motor housing 2, the motor housing 2 resonates. This invention employs an odd number of first torsion transmission structures 3, which can increase the frequency corresponding to the even-order vibration modes in the circumferential direction of the motor housing 2, thus reducing NVH occurrence. In other words, because there are an odd number of pairs of torsion transmission structures evenly distributed along the circumferential direction on the motor housing 2, its mode shape will be significantly changed compared to a smooth thin-walled cylindrical structure, the circumferential even-order vibration natural frequencies will be significantly increased, and the even-order modal resonance problem caused by electromagnetic force excitation of the motor housing 2 will be greatly alleviated.

[0051] Alternatively, an odd number can be five, seven, nine, etc.

[0052] In addition, when assembling the stator core 1 and the motor housing 2, the first torque transmission structure 3 or the second torque transmission structure 4 can guide the installation of the stator core 1.

[0053] According to the embodiment of the present invention, by setting an odd number of first torque transmission structures 3 and making the second torque transmission structure 4 and the first torque transmission structure 3 mutually resist each other, the circumferential even-order vibration natural frequency of the motor housing 2 can be greatly increased, the even-order modal resonance problem generated by electromagnetic force excitation of the motor housing 2 will be greatly alleviated, thereby improving the NVH performance of the motor 10.

[0054] In some embodiments of the present invention, for the second torque transmission structure 4 and the first torque transmission structure 3, one of the two torque transmission structures is a torque transmission protrusion and the other is a torque transmission groove. The torque transmission protrusion is adapted to be fitted into the torque transmission groove. In this way, the side of the torque transmission protrusion can abut against the side wall of the torque transmission groove, thereby realizing the torque transmission between the stator core 1 and the motor housing 2.

[0055] Specifically, in some embodiments, reference is made to Figures 1-10 As shown, the second torque transmission structure 4 is a torque transmission groove, and the first torque transmission structure 3 is a torque transmission protrusion. The torque transmission protrusion is provided on the inner circumferential surface of the motor housing 2 and protrudes in the direction of the stator core 1, while the torque transmission groove is formed on the outer circumferential surface of the stator core 1.

[0056] In some optional embodiments, the first torque transmission structure 3 is a torque transmission groove, and the second torque transmission structure 4 is a torque transmission protrusion. The torque transmission protrusion is disposed on the outer peripheral surface of the stator core 1 and protrudes in the direction of the motor housing 2, while the torque transmission groove is formed on the inner peripheral surface of the motor housing 2.

[0057] In some embodiments, the torque-transmitting protrusion has a root 52 and a top 51, the top 51 being located within the torque-transmitting groove to facilitate the torque-transmitting protrusion's engagement with the torque-transmitting groove, resulting in more reliable torque transmission. The root 52 and the top 51 are disposed opposite to each other, with the root 52 located outside the torque-transmitting groove.

[0058] In some embodiments of the present invention, the width of the root 52 (i.e., the circumferential width) in the circumferential direction of the motor 10 is smaller than the width of the top 51. The torque transmission groove is adapted to match the structure of the torque transmission protrusion, that is, the circumferential width at the bottom of the torque transmission groove is greater than the circumferential width at the opening. In this way, when the top 51 is embedded in the torque transmission groove and the root 52 is located outside the torque transmission groove, the torque transmission protrusion is not easy to fall out of the torque transmission groove, thereby improving the torque transmission reliability between the motor housing 2 and the stator core 1.

[0059] It should be noted that "the width of the root 52" refers to the minimum width of the root 52, and "the width of the top 51" refers to the maximum width of the top 51.

[0060] The root portion 52 is adapted to connect with corresponding components, such as in... Figures 1-10In the illustrated embodiment, the torque transmission protrusion is disposed on the motor housing 2, and the root 52 of the torque transmission protrusion is adapted to connect with the inner peripheral surface of the motor housing 2. In other embodiments, the torque transmission protrusion is disposed on the stator core 1, and the root 52 of the torque transmission protrusion is adapted to connect with the outer peripheral surface of the stator core 1.

[0061] In some embodiments of the present invention, the torsion transmission protrusion may include two first side surfaces 53, which are arranged opposite to each other, and the root 52 and the top 51 are connected by the two first side surfaces 53, with an included angle θ between the two first side surfaces 53.

[0062] In some embodiments of the present invention, θ satisfies the relationship: θ < 90°, in other words, θ is an acute angle.

[0063] θ further satisfies the following relationship: θ = k0 * 60°, k0 = 0.8 to 0.9. Optionally, θ = 48°, 50°, 52°, 53°, 54°, etc.

[0064] In some embodiments of the present invention, reference is made to... Figures 1-3 , Figures 5-10 As shown, the second torque transmission structure 4 is a torque transmission groove, the first torque transmission structure 3 is a torque transmission protrusion, and the root 52 is connected to the inner circumferential surface of the motor housing 2.

[0065] Reference Figures 5-8 As shown, the inner circumferential radius of the motor housing 2 is Rb, the outer circumferential radius of the motor housing 2 is Ra, the maximum width of the top 51 in the circumferential direction of the motor 10 is Ha, the dimension of the motor housing 2 at the torque transmission protrusion in the radial direction of the motor 10 is Hb, and the number of torque transmission protrusions is m. Ha and Hb satisfy the following relationship:

[0066] Hb = k1*(Ra - Rb),

[0067] Ha = 360 * k² * Hb / m

[0068] Where k1 = 1.5 to 1.6, k2 = 1.1 to 1.3.

[0069] Optionally, Hb = 1.55 * (Ra - Rb).

[0070] When m = 7, Ha = 360 * 1.2 * Hb / 7 = 360 * 1.2 * 1.55 * (Ra - Rb) / 7 = 3348 * (Ra - Rb) / 35.

[0071] In some embodiments of the present invention, the root portion 52 is constructed with a transition fillet, which helps to reduce stress concentration at the root portion 52. The radius of the root portion 52 is Rc. The torsion transmission groove includes a bottom surface 62 and two second side surfaces 61, which are arranged opposite to each other. The bottom surface 62 is used to connect the two second side surfaces 61. The radius of the transition fillet at the connection between the bottom surface 62 and the second side surface 61 is Rd. Rc and Rd satisfy the relationship: Rc = k3 * Rd, where k3 = 1.1 to 1.3. k3 can be 1.15, 1.2, 1.25, etc.

[0072] Optionally, Rc = 1.2 * Rd.

[0073] Reference Figures 7-8 As shown, when the second torsion transmission structure 4 is a torsion transmission groove and the first torsion transmission structure 3 is a torsion transmission protrusion, both second side surfaces 61 are connected to the outer peripheral surface of the stator core 1, and the radius of the connection between the second side surface 61 and the outer peripheral surface of the stator core 1 is Re. In other words, the connection between the second side surface 61 and the outer peripheral surface of the stator core 1 is a rounded transition, which helps to reduce the stress concentration phenomenon at the torsion transmission groove.

[0074] In some embodiments of the present invention, the first torque transmission structure 3 is configured as a torque transmission protrusion, and the second torque transmission structure 4 is also configured as a torque transmission protrusion. The two torque transmission structures are adapted to be staggered along the circumferential direction of the motor 10.

[0075] In some embodiments of the present invention, reference is made to... Figure 1 , Figure 4 , Figures 9-10 As shown, the motor 10 according to an embodiment of the present invention may further include a high-damping layer 7, which is located between the outer peripheral surface of the stator core 1 and the inner peripheral surface of the motor housing 2. In the radial direction of the motor 10, the thickness of the high-damping layer 7 is less than the thickness of the torsion-transmitting protrusion.

[0076] In some embodiments of the present invention, the second torsion transmission structure 4 is a torsion transmission groove, the first torsion transmission structure 3 is a torsion transmission protrusion, and the high damping layer 7 has a clearance groove 71, through which the first torsion transmission structure 3 is adapted. The high damping layer 7 can be constructed as a multi-piece split structure, with each split structure located between two adjacent first torsion transmission structures 3, i.e., between two pairs of torsion transmission structures.

[0077] In other embodiments of the present invention, the first torsion transmission structure 3 is a torsion transmission groove, the second torsion transmission structure 4 is a torsion transmission protrusion, the high damping layer 7 has a relief groove 71, and the second torsion transmission structure 4 is adapted to pass through the relief groove 71.

[0078] In some other embodiments of the invention, such as Figure 14As shown, both the second torsion transmission structure 4 and the first torsion transmission structure 3 are constructed as torsion transmission protrusions. The high damping layer 7 has a relief groove 71, and both the second torsion transmission structure 4 and the first torsion transmission structure 3 are adapted to pass through the relief groove 71.

[0079] exist Figure 14 In the illustrated embodiment, the first torque transmission structure 3 includes a first forward torque transmission protrusion 31 and a first reverse torque transmission protrusion 32, and the second torque transmission structure 4 includes a second forward torque transmission protrusion 41 and a second reverse torque transmission protrusion 42. The number of first forward torque transmission protrusions 31 is odd, and each second forward torque transmission protrusion 41 corresponds to one of the first forward torque transmission protrusions 31. The number of first reverse torque transmission protrusions 32 is also odd, and each second reverse torque transmission protrusion 42 corresponds to one of the first reverse torque transmission protrusions 32.

[0080] When the motor 10 rotates in the forward direction, the second forward torque transmission protrusion 41 is adapted to engage with the first forward torque transmission protrusion 31 to transmit forward torque. When the motor 10 rotates in the reverse direction, the second reverse torque transmission protrusion 42 is adapted to engage with the first reverse torque transmission protrusion 32 to transmit reverse torque. In other words, the second forward torque transmission protrusion 41 and the first forward torque transmission protrusion 31 form a pair of forward torque transmission structures, and the second reverse torque transmission protrusion 42 and the first reverse torque transmission protrusion 32 form a pair of reverse torque transmission structures. The number of forward torque transmission structures is odd, and the number of reverse torque transmission structures is odd.

[0081] An installation space 8 is formed between the outer peripheral surface of the stator core 1 and the inner peripheral surface of the motor housing 2, and the high damping layer 7 is suitable for installation within the high damping layer 7.

[0082] When the circumferential width of the root 52 of the torsion transmission protrusion is less than the circumferential width of the top 51, the top 51 can limit and position the high damping layer 7, so that the high damping layer 7 is located between the top 51 and the root 52 of the torsion transmission protrusion, preventing the high damping layer 7 from falling off.

[0083] In some embodiments of the present invention, the coefficient of thermal expansion of the motor housing 2 is less than that of the high-damping layer 7. In the non-thermal state, the outer wall surface of the high-damping layer 7 and the inner circumferential surface of the motor housing 2 can be in a clearance fit, as can the inner wall surface of the high-damping layer 7 and the outer circumferential surface of the stator core 1. In the thermal state, the high-damping layer 7 expands significantly, resulting in an interference fit between the motor housing 2, the high-damping layer 7, and the stator core 1, thereby assisting in torque transmission and alleviating the stress concentration problem caused by the second torque transmission structure 4 and the first torque transmission structure 3. When installing the high-damping layer 7, it can be installed along the axial direction of the motor 10 into the motor housing 2. At this time, an installation space for the high-damping layer 7 is formed between the two first torque transmission structures 3 (or between the two second torque transmission structures 4), and the first torque transmission structure 3 or the second torque transmission structure 4 can guide the high-damping layer 7.

[0084] The reduced size of the root 52 of the torsion transmission protrusion serves two purposes: firstly, it can install and position the high damping layer 7; secondly, it can ensure that the structure is squeezed and deformed towards the high damping layer 7 when hot, thereby increasing the interference torsion transmission capacity between the motor housing 2, the high damping layer 7 and the stator core 1.

[0085] The high-damping layer 7 can be a high-damping hardened material layer. Optionally, the high-damping layer 7 can be made of various materials and processes, such as polyurethane high-damping composite materials.

[0086] Figure 1 This is an exploded view of the motor 10 according to an embodiment of the present invention, and the motor housing 2 is shown as follows. Figure 2 As shown, stator core 1 is as follows Figure 3 As shown, the high damping layer 7 Figure 4 As shown.

[0087] In some embodiments of the present invention, the extension direction of the torque transmission protrusion is consistent with the axial direction of the motor 10.

[0088] In some other embodiments of the present invention, the extension direction of the torque transmission protrusion is not consistent with the axial direction of the motor 10, that is, the extension direction of the torque transmission protrusion is inclined.

[0089] In some embodiments of the present invention, a positioning boss 23 is provided on the inner circumferential surface of the motor housing 2. The positioning boss 23 is used to position the stator core 1 and is arranged along the circumferential direction of the motor housing 2.

[0090] In some embodiments, the stator core 1 is constructed with a full ring of protrusions.

[0091] In other embodiments, the stator core 1 is constructed as a multi-segment protrusion or a multi-point protrusion.

[0092] Reference Figure 3 As shown, a plurality of stator grooves 11 are provided on the outer peripheral surface of the stator core 1. In some embodiments of the present invention, the stator grooves 11 are adapted to extend along the axial direction of the stator core 1. In other embodiments of the present invention, the stator grooves 11 are inclined relative to the axial direction of the stator core 1.

[0093] A coolant flow channel 24 is provided on the inner circumferential surface of the motor housing 2, and the coolant flow channel 24 is adapted to extend along the circumferential direction of the motor housing 2. The motor housing 2 also has a liquid inlet 21 and a liquid outlet 22, both of which are directly or indirectly connected to the internal cavity of the housing. The coolant flow channel 24 is also connected to the liquid inlet 21, and the cooling medium flowing in from the liquid inlet 21 can enter the coolant flow channel 24 and then enter the stator groove 11 to facilitate the cooling of the stator core 1.

[0094] Optionally, the cooling medium can be a liquid cooling medium, such as cooling oil or coolant, or it can be a cooling gas. The cooling medium can be circulated by the pump body, entering the inlet 21 and flowing out from the outlet 22.

[0095] Among them, reference Figures 1-2 As shown, the motor housing 2 may include a housing body, with a first flange edge 25 at the first axial end of the housing body and a second flange edge 26 at the second axial end of the housing body.

[0096] Multiple first mounting holes may be provided on the first flange edge 25 to facilitate the connection of the first flange edge 25 with other components. For example, in some embodiments, fasteners such as bolts are used to fasten the first end cover through the first mounting holes, thereby connecting the first end cover to the motor housing 2. Optionally, the first mounting holes can be threaded holes or smooth holes. The multiple first mounting holes can be evenly distributed along the axis of the housing body.

[0097] Similarly, multiple second mounting holes can be provided on the second flange edge 26 to facilitate the connection of the second flange edge 26 with other components. For example, in some embodiments, fasteners such as bolts are used to fasten the second end cover through the second mounting holes, thereby connecting the second end cover to the motor housing 2. Optionally, the second mounting holes can be threaded holes or smooth holes. The multiple second mounting holes can be evenly distributed along the axis of the housing body.

[0098] The following is combined with Figures 1-13 A detailed description of an electric motor 10 according to a specific example of the present invention is provided.

[0099] The motor 10 includes a stator core 1 and a motor housing 2. The motor housing 2 has an internal cavity, in which the stator core 1 is installed. A positioning boss 23 is provided on the inner circumferential surface of the motor housing 2. The positioning boss 23 protrudes around the circumference of the motor housing 2 and is used to position the stator core 1.

[0100] Coolant channels 24 are provided on the inner circumferential surface of the motor housing 2, and the coolant channels 24 extend along the circumferential direction of the motor housing 2. Multiple stator grooves 11 are provided on the outer circumferential surface of the stator core 1, and the stator grooves 11 are adapted to extend along the axial direction of the stator core 1. The motor housing 2 also has a liquid inlet 21 and a liquid outlet 22. The coolant channels 24 are connected to the liquid inlet 21, allowing coolant flowing in from the liquid inlet 21 to enter the coolant channels 24 and then into the stator grooves 11, thereby facilitating the cooling of the stator core 1.

[0101] The inner circumferential surface of the motor housing 2 is provided with seven torque transmission protrusions, which are evenly distributed along the circumferential direction of the motor 10. The outer circumferential surface of the stator core 1 is provided with seven torque transmission grooves, which are also evenly distributed along the circumferential direction of the motor 10. Each torque transmission protrusion is fitted into the corresponding torque transmission groove and extends along the axial direction of the motor 10.

[0102] A high-damping layer 7 is disposed between two adjacent torsion transmission protrusions. The high-damping layer 7 is located between the outer peripheral surface of the stator core 1 and the inner peripheral surface of the motor housing 2. The coefficient of thermal expansion of the motor housing 2 is less than the coefficient of thermal expansion of the high-damping layer 7.

[0103] According to an embodiment of the present invention, the motor 10 employs a stop structure composed of an odd number of pairs of second torsion transmission structures 4 and first torsion transmission structures 3. This can increase the frequency corresponding to the even-order vibration modes in the circumferential direction of the motor housing 2, thereby reducing NVH (noise, vibration, and harshness). Simultaneously, since the stator core 1 and the motor housing 2 are mainly in contact through a high-damping layer 7, the excitation energy transmitted from the stator core 1 to the motor housing 2 is significantly reduced by the high-damping material of the high-damping layer 7. This ensures that the vibration excitation energy is insufficient to excite the structure of the motor housing 2, thus guaranteeing that the NVH performance of the motor 10 meets the design requirements.

[0104] Reference Figure 15 As shown, a vehicle 100 according to another embodiment of the present invention includes a vehicle body and a motor 10 as described in the above embodiment. Wheels 20 are mounted on both sides of the vehicle body, and the motor 10 is mounted on the vehicle body.

[0105] Optionally, vehicle 100 can be a new energy vehicle, which may include pure electric vehicles, range-extended electric vehicles, hybrid vehicles with a main drive motor 10, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0106] The vehicle 100 according to the present invention uses the motor 10 of the above embodiment, which makes the NVH performance of the vehicle 100 excellent and helps to improve user satisfaction.

[0107] The vehicle 100 according to an embodiment of the present invention employs the motor 10 of the above embodiment, which combines interference and torque transmission between the stator core and the motor housing. Simultaneously, a high-damping hardened material layer isolates most of the excitation energy from the stator to the motor housing. This design, on the one hand, eliminates some excitation energy through the high-damping layer structure; on the other hand, by using an odd number of torque structures, it alters the mode shape of the motor housing model, significantly increasing the even-order natural frequencies and further reducing the possibility of even-order resonance in the motor housing, thereby further reducing NVH (noise, vibration, and harshness). Simultaneously, due to the use of interference and torque transmission structures, stress concentration on the motor housing is significantly alleviated, effectively reducing high stress on the motor housing and meeting the increasing design requirements for low noise and long lifespan in motors.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0109] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An electric machine characterized in that, include: Motor housing; A stator core is installed inside the motor housing. A first torque transmission structure is provided on the inner circumferential surface of the motor housing, and a second torque transmission structure is provided on the outer circumferential surface of the stator core. The first torque transmission structure is adapted to abut against the second torque transmission structure along the circumferential direction of the motor. Both the first and second torque transmission structures are an odd number. One of the first and second torque transmission structures is a torque transmission protrusion, and the other is a torque transmission groove. The torque transmission protrusion is embedded in the torque transmission groove. The torque transmission protrusion has a top and a root. The top is located inside the torque transmission groove, and the root is opposite to the top and located outside the torque transmission groove. The circumferential width of the top is greater than the circumferential width of the root. The torque transmission protrusion comprises two opposite first side surfaces for connecting the top and the root, and the included angle between the two first side surfaces is θ, which is an acute angle; θ=k0 60°, k0=0.8~0.9; the first torque transmission structure is a torque transmission protrusion, the second torque transmission structure is a torque transmission groove, and the root is connected with the inner circumferential surface of the motor shell. The number of torque-transmitting protrusions is m, the outer circumferential radius of the motor housing is Ra, the inner circumferential radius of the motor housing is Rb, the radial thickness of the motor housing at the torque-transmitting protrusion is Hb, and the maximum circumferential width of the top is Ha. Hb=k1 (Ra-Rb), Ha=360 k2 Hb / m, Where k1 = 1.5~1.6, k2 = 1.1~1.3; The torsion-transmitting groove includes two opposing second side surfaces and a bottom surface connecting the two second side surfaces. The radius of the connection between the second side surface and the bottom surface is Rd, and the radius of the root is Rc, where Rc = k3. Rd, k3 = 1.1~1.

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2. The motor according to claim 1, characterized in that, Both the first torque transmission structure and the second torque transmission structure are torque transmission protrusions and are offset from each other along the circumference of the motor.

3. The motor according to any one of claims 1-2, characterized in that, A high-damping layer is further provided between the inner circumferential surface of the motor housing and the outer circumferential surface of the stator core. The high-damping layer has a clearance groove for the first torsion transmission structure and / or the second torsion transmission structure to pass through. The coefficient of thermal expansion of the high-damping layer is greater than the coefficient of thermal expansion of the motor housing.

4. The motor according to any one of claims 1-2, characterized in that, The torque transmission protrusion extends along the axial direction of the motor; or, the torque transmission protrusion is inclined relative to the axial direction of the motor.

5. The motor according to claim 1, characterized in that, The inner circumferential surface of the motor housing is provided with a positioning boss for positioning the stator core, and the positioning boss is arranged along the circumferential direction of the motor housing.

6. A vehicle, characterized in that, The motor included in any one of claims 1-5.

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