Asynchronous motor, automobile, electric aircraft and electric motorcycle

Abstract

The utility model discloses an asynchronous motor, an automobile, an electric aircraft and an electric motorcycle, and the motor comprises a stator which is provided with a plurality of stator grooves, and the plurality of stator grooves are arranged at intervals along the circumferential direction of the stator; the stator is wound on the rotor along the circumferential direction, the rotor is provided with a plurality of rotor grooves, and the plurality of rotor grooves are arranged at intervals along the circumferential direction of the rotor; the number of the rotor slots is 54, and the number of the stator slots is 48. According to the utility model, rotor tooth harmonic waves can be weakened, so that torque pulsation is reduced, vibration, noise and the like of the motor are obviously improved, and the operation stability of an electric driving system and the NVH performance of a new energy automobile are effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of motors, and in particular to an asynchronous motor, a car, an electric aircraft and an electric motorcycle. Background Art

[0002] With the development of new energy vehicles, motors, as one of the core components of new energy vehicles, play a decisive role in the performance of new energy vehicles. In the prior art, new energy vehicles usually use permanent magnet synchronous motors and asynchronous motors.

[0003] Among them, permanent magnet synchronous motors use permanent magnets as rotors and generate torque through the interaction of magnetic fields. Currently, most of the motors used in domestic new energy vehicles are permanent magnet synchronous motors. However, since permanent magnet synchronous motors contain rare materials such as rare earths, the cost of permanent magnet synchronous motors is relatively high, and permanent magnet synchronous motors also face the risk of demagnetization causing the motor to fail to work normally.

[0004] Asynchronous motors, also known as induction motors, have stators that can generate rotating magnetic fields. By placing the rotor in the rotating magnetic field generated by the stator, the rotor will generate a torque under the action of the rotating magnetic field. In the new energy vehicle industry, 4-pole or 6-pole motors (i.e., the number of magnetic poles of the motor is 4 or 6) are commonly used. In addition, the torque pulsation of asynchronous motors in the prior art is relatively high. Torque pulsation refers to the fluctuation of the output torque of the motor. It is usually caused by an uneven magnetic field inside the motor or an imbalance in the mechanical system. When the torque pulsation is high, it will reduce the running smoothness of the motor, increase noise, accelerate the wear of mechanical parts and reduce the life of the motor. Utility Model Content

[0005] The purpose of the utility model is to solve the technical problem of high torque pulsation of the motor in the prior art. The utility model provides an asynchronous motor that can weaken rotor tooth harmonics, reduce torque pulsation, and improve the running stability and NVH (noise, vibration and harshness) performance of the electric drive system.

[0006] To solve the above technical problems, an embodiment of the utility model discloses an asynchronous motor, comprising: a stator, wherein the stator has a plurality of stator slots, and the plurality of stator slots are arranged at intervals along the circumference of the stator; a rotor, wherein the stator is circumferentially wound around the rotor, and the rotor has a plurality of rotor slots, and the plurality of rotor slots are arranged at intervals along the circumference of the rotor; the number of the rotor slots is 54, and the number of the stator slots is 48.

[0007] In an asynchronous motor, there are stator teeth between two adjacent stator slots, and there are rotor teeth between two adjacent rotor slots. The tooth harmonics of the motor include stator tooth harmonics and rotor tooth harmonics. Tooth harmonics are caused by the interaction between the stator and rotor of the motor. During the operation of the motor, due to the change of current and the change of magnetic field inside the motor, harmonic signals (that is, the additional frequency components generated during the operation of the motor that are different from the fundamental frequency (usually 50Hz or 60Hz)) are generated.

[0008] Due to the existence of tooth harmonics, the additional torque they bring will cause the motor to produce greater vibration and noise during operation, affecting the stability of the motor; at the same time, the pulse vibration caused by tooth harmonics will also affect the working efficiency of the motor (referring to the energy utilization rate that the motor can achieve in the process of converting electrical energy into mechanical energy).

[0009] When the number of stator slots is close to the number of rotor slots, the fit between the rotor slots and the stator slots is called a near-slot fit. In the near-slot fit, the width of the rotor teeth along the radial direction close to one end of the stator is close to the wavelength of the stator tooth harmonics. Therefore, the pulse vibration in the rotor teeth caused by the stator tooth harmonics is smaller, and the additional loss caused by the pulse vibration is also smaller. At the same time, the additional torque brought by the rotor tooth harmonics will also be reduced.

[0010] Therefore, the above technical solution is adopted to set the number of rotor slots to 54 and the number of stator slots to 48. Through the close-slot coordination of the rotor slots and the stator slots, on the one hand, the working efficiency of the motor can be improved by reducing additional losses; on the other hand, the additional torque brought by the rotor tooth harmonics can be reduced to reduce the torque pulsation of the motor, which has obvious improvements on the vibration and noise of the motor, and effectively improves the running stability of the electric drive system and the NVH performance of new energy vehicles.

[0011] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses an asynchronous motor, wherein the rotor slots are closed slots.

[0012] By adopting the above technical solution, the additional loss generated on the rotor surface can be further reduced to improve the working efficiency of the motor.

[0013] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses an asynchronous motor, wherein the stator slots are open slots.

[0014] The above technical solution makes it easy to install the coil through the opening of the open slot, thereby speeding up the winding efficiency of the motor winding (referring to the part where the coil is wound on the stator slot of the motor to generate a magnetic field).

[0015] According to another specific embodiment of the utility model, the embodiment of the utility model discloses an asynchronous motor, each of the stator slots includes a plurality of mounting positions, the plurality of mounting positions are radially stacked, and each of the mounting positions is used for inserting a coil.

[0016] By adopting the above technical solution, the motor winding can adopt a solution of winding the coils in layers, so that when the motor is working, the stator can generate a greater magnetic field strength to increase the output power of the motor.

[0017] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses an asynchronous motor, wherein the coil comprises a flat wire, and a size of the flat wire in a radial direction is smaller than a size of the flat wire in a circumferential direction.

[0018] By adopting the above technical solution, the projection of the coil in the axial direction has a larger wire cross-sectional area, which can provide better conductivity and heat dissipation effect.

[0019] According to another specific embodiment of the utility model, the embodiment of the utility model discloses an asynchronous motor, wherein along the circumferential direction, the 48 stator slots are divided into 8 groups of stator slot groups, each group of stator slot groups includes 6 stator slots, and the magnetic poles of two adjacent groups of stator slot groups are opposite in polarity.

[0020] By adopting the above technical solution, compared with the commonly used 4-pole motor (with 4 poles) and 6-pole motor (with 6 poles), the 8-pole motor (with 8 poles) can provide greater output power.

[0021] The embodiment of the utility model further discloses a car, which at least comprises the asynchronous motor in any one of the above embodiments.

[0022] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a car, which includes a new energy car.

[0023] The new energy vehicle obtained by adopting the above technical solution can reduce the vibration and noise levels of the vehicle, improve the acoustic environment inside the vehicle, enhance the comfort performance of the vehicle, and compared with permanent magnet motors, can reduce the production cost of automobile motors.

[0024] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a car, wherein the new energy car comprises an electric drive, and the asynchronous motor is arranged on the electric drive.

[0025] By adopting the above technical solution, the aforementioned 8-pole motor can directly replace the rotor of the permanent magnet motor (the number of pole pairs is 4 and the number of stator slots is 48) on the platform of the electric drive, share other components with the aforementioned permanent magnet motor, and realize switching between the permanent magnet synchronous motor and the asynchronous induction motor by replacing the rotor, which can save the development cycle of new products.

[0026] The embodiment of the utility model further discloses an electric aircraft, which at least includes the asynchronous motor in any one of the above embodiments.

[0027] The embodiment of the utility model further discloses an electric motorcycle, which at least includes the asynchronous motor in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram showing fluctuations in torque applied to the rotor within one cycle when the number of rotor slots of the asynchronous motor is 56 in some embodiments is shown.

[0029] Figure 2 Schematic diagram showing fluctuations of the torque on the rotor in one cycle when the number of rotor slots of the asynchronous motor is 52 in some embodiments

[0030] Figure 3 A three-dimensional schematic diagram of an asynchronous motor provided in an embodiment of the present application is shown.

[0031] Figure 4 A three-dimensional schematic diagram of the rotor slots and stator slots of the asynchronous motor provided in an embodiment of the present application is shown.

[0032] Figure 5 A schematic diagram showing fluctuations in torque applied to the rotor within one cycle when the number of rotor slots of the asynchronous motor provided in an embodiment of the present application is 54 is shown.

[0033] Figure 6 A partial enlarged schematic diagram of an asynchronous motor provided in an embodiment of the present application is shown.

[0034] Figure 7 A schematic diagram of a flat wire coil of an asynchronous motor provided in an embodiment of the present application is shown.

[0035] Figure 8 A schematic diagram of an axial projection of an asynchronous motor provided in an embodiment of the present application is shown.

[0036] Fig. 9 A three-dimensional schematic diagram of the conductor of the rotor of the asynchronous motor provided in an embodiment of the present application is shown.

[0037] Fig.10 A schematic diagram showing the axial projection of the rotor slots of the rotor of the asynchronous motor provided in an embodiment of the present application is shown.

[0038] Fig.11 A schematic diagram of the axial projection of a rotor of an asynchronous motor provided in an embodiment of the present application when the rotor slots are open slots is shown.

[0039] Fig.12 A motor efficiency cloud diagram is shown when the rotor slots of the asynchronous motor provided in an embodiment of the present application are open slots.

[0040] Fig.13 A motor efficiency cloud diagram is shown when the rotor slots of the asynchronous motor provided in an embodiment of the present application are closed slots. DETAILED DESCRIPTION

[0041] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0042] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0043] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0044] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0045] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0046] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0047] In some embodiments, the motor used in the new energy vehicle includes a stator and a rotor, the stator is provided with a plurality of stator slots, and the rotor is provided with a plurality of rotor slots, wherein the number of stator slots is 48 and the number of rotor slots is 56. Figure 1 , Figure 2 , Figure 1 The figure shows the fluctuation of the torque on the rotor in one cycle when the number of rotor slots is 56. Figure 2 The figure shows the fluctuation of the torque on the rotor in one cycle when the number of rotor slots is 52. The torque on the rotor changes with the change of the rotor rotation angle through ANSYS, MATLAB and other software, and finally forms Figure 1 , Figure 2 , Figure 1 and Figure 2 The vertical axis represents the torque value of the rotor (in N*m), and the horizontal axis represents the angle of rotation of the rotor (in degrees). Figure 1 , Figure 2 It can be seen that the rotor rotates from 360 degrees to 720 degrees in one cycle. During this cycle, the torque on the rotor surface changes with the change of the rotor rotation angle.

[0048] in, Figure 1 Point a1 shows the lowest torque point of the rotor in one cycle. At this time, the rotor rotates at an angle of 408 degrees and the torque on the rotor is 204.6066N*m. Figure 1 Point b1 shows the highest point of the torque received by the rotor in one cycle. At this time, the angle of rotation of the rotor is 500.4 degrees, the torque received by the rotor is 209.8653N*m, and the peak-to-peak value of the torque received by the rotor (that is, the difference between the maximum and minimum values ​​of the torque received by the rotor in one cycle) is 5.2587N*m.

[0049] Figure 2Point a2 shows the lowest torque point of the rotor in one cycle. At this time, the rotor rotates at an angle of 710.4 degrees and the torque on the rotor is 204.0707N*m. Figure 2 Point b2 shows the highest point of the torque applied to the rotor in one cycle. At this time, the rotor rotates at an angle of 614.4 degrees, the torque applied to the rotor is 205.2697 N*m, and the peak-to-peak value of the torque applied to the rotor (i.e., the difference between the maximum and minimum values ​​of the torque in one cycle) is 1.199 N*m.

[0050] Therefore, the peak-to-peak value of the torque on the rotor with 52 rotor slots is 1.199N*m, and the peak-to-peak value of the torque on the rotor with 56 rotor slots is 5.2587N*m. The torque fluctuations on the rotors in both cases are large, which will reduce the running stability of the motor, increase noise, accelerate the wear of mechanical parts and possibly reduce the life of the motor, which will have an adverse effect on the running stability and NVH performance of the electric drive system.

[0051] See also Figure 3 Some embodiments of the present application provide an asynchronous motor, including a stator 10 and a rotor 20. The stator 10 refers to the part of the motor that is stationary relative to the motor housing (not shown in the figure) in the radial direction X, the axial direction Y, and the circumferential direction Z, and is usually composed of a stator core 11 and a coil 12. The main function of the stator 10 is to generate a rotating magnetic field, thereby driving the rotor 20 to rotate. The coil 12 of the stator 10 is usually wound with copper wire, and its number and arrangement are determined according to the type and design requirements of the motor. The rotor 20 includes a rotor core 21 and a transmission shaft 22. The transmission shaft 22 is passed through the rotor core 21 and rotates with the rotation of the rotor 20.

[0052] In some embodiments, see Figure 4 The stator core 11 has a plurality of stator slots 13, and the plurality of stator slots 13 are arranged at intervals along the circumferential direction Z of the stator core 11; the stator core 11 is wound around the rotor 20 along the circumferential direction Z, and the rotor core 21 has a plurality of rotor slots 23, and the plurality of rotor slots 23 are arranged at intervals along the circumferential direction Z of the rotor core 21. Exemplarily, the stator core 11 and the rotor core 21 are coaxially arranged, wherein the stator core 11 is annular, and the rotor core 21 is cylindrical.

[0053] In some embodiments, the number of rotor slots 23 is 54, and the number of stator slots 13 is 48. Exemplarily, the stator core 11 has 48 stator teeth 131, and each stator tooth 131 is located between two adjacent stator slots 13; the rotor core 21 has 54 rotor teeth 231, and each rotor tooth 231 is located between two adjacent rotor slots 23.

[0054] refer to Figure 5 , Figure 5 The figure shows the fluctuation of the torque on the rotor in one cycle when the number of rotor slots is 54. Figure 5 The vertical axis represents the torque value of the rotor (in N*m), and the horizontal axis represents the angle of rotation of the rotor (in degrees). Figure 5 It can be seen that the rotor rotates from 360 degrees to 720 degrees in one cycle. During this cycle, the torque on the rotor surface changes with the change of the rotor rotation angle. Figure 5 Point a3 in the middle shows the lowest torque point of the rotor in one cycle. At this time, the rotor rotates at an angle of 407.4 degrees and the torque on the rotor is 205.8072N*m. Figure 5 Point b3 shows the highest point of the torque received by the rotor in one cycle. At this time, the rotation angle of the rotor is 552.6 degrees, the torque received by the rotor is 206.5978N*m, and the peak-to-peak value of the torque received by the rotor is 0.7906N*m.

[0055] It can be seen that when the number of rotor slots is 54 and the number of stator slots is 48, the peak-to-peak value of the torque on the rotor is 0.7152N*m, and the peak-to-peak value of the torque on the rotor is smaller, which is smaller than when the number of rotor slots is 56 or 52. At this time, the torque pulsation of the asynchronous motor in the new energy vehicle is smaller. On the one hand, it can improve the running stability of the electric drive system and the NVH performance of the new energy vehicle; on the other hand, the solution of 54 rotor slots and 48 stator slots can also reduce the additional loss caused by pulsed vibration in the motor to improve the working efficiency of the motor.

[0056] refer to Figures 6 to 8 In some embodiments, the stator slot 13 is an open slot, that is, along the radial direction X, each stator slot 13 has an opening 131 at one end close to the rotor core 21. Exemplarily, the stator 11 also has a receiving cavity 14, and the rotor core 21 is disposed in the receiving cavity 14. The opening 131 connects the stator slot 13 with the receiving cavity 14. It is convenient to install the coil in the stator slot 13 through the opening 131, speeding up the winding efficiency of the motor winding, and also providing better heat dissipation conditions for the stator core 11 winding.

[0057] In some embodiments, each stator slot 13 includes a plurality of mounting positions 132, and the plurality of mounting positions 132 are stacked in a radial direction X for inserting the coil 12. Exemplarily, each stator slot 13 includes 4 mounting positions 132, and each mounting position 132 has a coil 12 inserted therein, forming a design scheme of a 4-layer winding, which enables the stator core 11 to generate a greater magnetic field strength when the motor is working, so as to improve the output power of the motor. It should be noted that the present application does not limit the number of mounting positions 132, and each stator slot 13 may also include 2, 3, 5, 6, 7, 8, etc., multiple numbers of mounting positions 132 to form windings of different numbers of layers.

[0058] In some embodiments, the coil includes a flat wire, and the dimension c of the flat wire in the radial direction X is smaller than the dimension d of the flat wire in the circumferential direction Z. Exemplarily, the projection of the wire of the coil in the axial direction is a rectangular or flat shape, and this structure has a larger wire cross-sectional area, which can provide better conductivity and heat dissipation effects.

[0059] In some embodiments, along the circumferential direction Z, the 48 stator slots 13 are divided into 8 stator slot groups, each stator slot group has a coil wound therearound, and each stator slot group (eg Figure 8 The dotted line includes an e region, an f region, or a g region (shown in FIG. 1 ), which includes 6 stator slots, and the magnetic pole polarities of two adjacent stator slot groups are opposite. For example, the magnetic pole polarity of the e region is an N pole, and the magnetic pole polarities of the two adjacent regions, the f region and the g region, are both S poles. A motor with 8 magnetic poles is usually called an 8-pole motor. Compared with the 4-pole motor (with 4 magnetic poles) and 6-pole motor (with 6 magnetic poles) commonly used in the new energy vehicle industry, the 8-pole motor can provide greater output power.

[0060] refer to Figures 8 to 10 In some embodiments, the rotor core 21 includes a through hole 211, and the through hole 211 is used to install the transmission shaft 22 (see Figure 3 ), along the radial direction X, the rotor slot 23 is arranged between the through hole 211 and the stator slot 13, and is arranged at the edge of the rotor core 21, and the rotor slot 23 is used to install the conductor 212.

[0061] Exemplarily, the rotor core 21 includes 54 conductors 212, each conductor 212 is correspondingly arranged in each rotor slot 23. When the motor is working, the stator core 11 is supplied with alternating current, which can generate a rotating magnetic field. Due to the fluctuation of the magnetic field, current is generated in the conductor 212, causing the conductor 212 to rotate, driving the entire rotor core 21 to rotate. Exemplarily, the conductor 212 is extended along the axial direction Y, and along the axial direction Y, the projection of the conductor 212 is the same shape as the projection of the rotor slot 23, so that the conductor 212 is easily inserted into the rotor slot 23.

[0062] In some embodiments, the rotor slot 23 is a closed slot, that is, the rotor slot is not open on the rotor along the radial direction X. Exemplarily, the projection of the rotor slot 23 is roughly in the shape of a water drop. Specifically, refer to Fig.10 , along the radial direction X, there are a first arc 232 and a second arc 233, the two ends of the first arc 232 and the second arc 233 are respectively connected by a first straight line segment 234, and the arc length of the first arc 232 is greater than the arc length of the second arc 233. In other embodiments, the rotor slot 23 can also be other shapes such as a rectangle, as long as it corresponds to the shape of the conductor 212, and the present application does not limit this. Exemplarily, along the radial direction X, the rotor slot 23 is wider at one end close to the stator core 11.

[0063] refer to Fig.12 , Fig.13 , Fig.12 The motor efficiency cloud diagram is shown when the rotor slot is an open slot. Fig.13 The motor efficiency cloud diagram is shown when the rotor slot is a closed slot. Fig.10 When the size of the closed slot on the rotor is: the radius R1 of the first arc 232 is 2.2 cm, the radius R2 of the second arc 233 is 0.8 cm, and the length L1 of the first straight line segment 234 is 12.9 cm, the relationship between the output torque and the motor efficiency at different speeds is simulated by MATLAB, ANSYS and other software and formed Fig.12 . Combined Fig.11 , Fig.11 The schematic diagram of the axial projection of the rotor slot when it is an open slot is shown. When the size of the closed slot on the rotor is: the radius R3 of the third arc 235 is 1.68 cm, the radius R4 of the fourth arc 236 is 0.9 cm, the length L2 of the second straight line segment 237 is 16.28 cm, the length L3 of the third straight line segment 238 is 1.4 cm, and the length L4 of the fourth straight line segment 239 is 0.5 cm, the relationship between the output torque and the motor efficiency of the motor at different speeds is simulated by MATLAB, ANSYS and other software and formed Fig.13 .

[0064] Among them, Fig.12 and Fig.13 In the figure, the horizontal axis represents the motor speed (in rpm), and the vertical axis represents the torque output by the motor (in N*m). Each speed and torque value will get a motor efficiency value. The area with the same motor efficiency is enclosed by a closed curve to form the following figure: Fig.12 The A1 to A15 areas shown, Fig.13 The B1 to B15 area shown in the figure indicates that each motor efficiency value is within Fig.12 or Fig.13 The corresponding areas in are all sets of torque values ​​and multiple speed values ​​output by multiple motors.

[0065] For example, Fig.12 , A1 indicates a region where the motor efficiency is 96%, A2 indicates a region where the motor efficiency is 94%, A3 indicates a region where the motor efficiency is 93%, A4 indicates a region where the motor efficiency is 92%, and A15 indicates a region where the motor efficiency is 81%. Fig.13 , B1 indicates a region where the motor efficiency is 96%, B2 indicates a region where the motor efficiency is 94%, B3 indicates a region where the motor efficiency is 92%, B4 indicates a region where the motor efficiency is 92%, and B15 indicates a region where the motor efficiency is 81%. Fig.12 There are A5, A6, A7, A8, A9, A10, A11, A12, A13, and A14 between A4 and A15, which correspond to the motor efficiency areas of 91%, 90%, 89%, 88%, 87%, 86%, 85%, 84%, 83%, and 82% respectively; Fig.13 Between B4 to B15, there are B5, B6, B7, B8, B9, B10, B11, B12, B13, and B14, which correspond to the motor efficiency areas of 91%, 90%, 89%, 88%, 87%, 86%, 85%, 84%, 83%, and 82%, respectively.

[0066] For example, when the torque output by the motor is 150 Nm, the maximum motor efficiency that can be achieved is Fig.12 The corresponding area is A4, that is, the motor efficiency is 92%. At this time, the minimum speed of the motor corresponds to Fig.12 At point h1, the maximum speed of the motor corresponds to Fig.12 The middle h2 point ranges roughly between 5400rpm and 6800rpm.

[0067] The high efficiency range of the motor refers to the area where the motor efficiency is greater than 81%. Fig.12 In the example, when the rotor core is open slot, the area of ​​the high efficiency zone accounts for 88.01%; Fig.13 In the figure, when the rotor core is a closed slot, the area of ​​the high-efficiency zone accounts for 88.24%. By comparison, it can be seen that designing the rotor slot as a closed slot increases the area of ​​the high-efficiency zone of the motor by 2.3%, which can effectively reduce the additional loss caused by pulse vibration on the surface of the rotor core and effectively improve the efficiency of the motor.

[0068] The present application also provides a car, comprising at least the asynchronous motor in any of the aforementioned embodiments. In some embodiments, the aforementioned car includes a new energy car. At present, the new energy vehicle industry generally adopts 4-pole, 6-pole asynchronous motors or 8-pole permanent magnet synchronous motors, and none of them apply the technical solution of the stator having 48 stator slots and the rotor having 56 rotor slots of the present solution. The present solution can effectively reduce the vibration and noise level of the vehicle, improve the acoustic environment in the vehicle, and enhance the comfort performance of the vehicle.

[0069] In some embodiments, the new energy vehicle includes an electric drive, and the asynchronous motor is arranged in the electric drive. The basic architecture of EMR (Electrical Machine and Reducer) includes interconnected inverters, reducers and motors, and has the characteristics of high integration, modularization, good scalability, etc. The aforementioned 8-pole motor can directly replace the rotor core of the permanent magnet motor (the number of pole pairs is 4 and the number of stator slots is 48) on the platform of the electric drive, and share other components with the aforementioned permanent magnet motor. By replacing the rotor core, the permanent magnet synchronous motor and the asynchronous induction motor can be switched, which can save the development cycle of new products.

[0070] In addition, the present application also provides an electric aircraft, comprising at least the asynchronous motor in any of the above embodiments. The present application also provides an electric motorcycle, comprising at least the asynchronous motor in any of the above embodiments.

[0071] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An asynchronous motor, characterized in that: include: A stator, the stator having a plurality of stator slots, the plurality of stator slots being arranged at intervals along a circumferential direction of the stator; A rotor, wherein the stator is circumferentially wound around the rotor, the rotor having a plurality of rotor slots, and the plurality of rotor slots are spaced apart along the circumference of the rotor; The number of the rotor slots is 54, and the number of the stator slots is 48.

2. The asynchronous motor according to claim 1, characterized in that The rotor slots are closed slots.

3. The asynchronous motor according to claim 1 or 2, characterized in that: The stator slots are open slots.

4. The asynchronous motor according to claim 3, characterized in that Each of the stator slots includes a plurality of mounting positions, the plurality of mounting positions are radially stacked, and each of the mounting positions is used for inserting a coil.

5. The asynchronous motor according to claim 4, characterized in that The coil includes a flat wire, and a size of the flat wire in a radial direction is smaller than a size of the flat wire in a circumferential direction.

6. The asynchronous motor according to claim 1, characterized in that Along the circumferential direction, the 48 stator slots are divided into 8 stator slot groups, each stator slot group includes 6 stator slots, and the magnetic poles of two adjacent stator slot groups are opposite.

7. A car, characterized in that: Comprising an asynchronous motor as described in any one of claims 1-6.

8. The automobile according to claim 7, characterized in that: The automobile includes a new energy automobile.

9. The automobile according to claim 8, characterized in that The new energy vehicle comprises an electric drive, and the asynchronous motor is arranged on the electric drive.

10. An electric aircraft, characterized in that: Comprising an asynchronous motor as described in any one of claims 1-6.

11. An electric motorcycle, characterized in that: Comprising an asynchronous motor as described in any one of claims 1-6.

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