Asynchronous motor with rotor outer circumferential surface slotted, power assembly and vehicle

Abstract

The utility model provides an asynchronous motor with grooves in the outer circumferential surface of a rotor, a power assembly and a vehicle. The asynchronous motor comprises a motor shaft, a rotor and a stator, the stator coaxially sleeves the periphery of the rotor, the rotor is used for being in transmission connection with the motor shaft, the rotor comprises a rotor iron core and a sleeve, the outer circumferential surface of the rotor iron core comprises a plurality of grooves, the notch of each groove faces the inner circumferential surface of the stator in the radial direction of the asynchronous motor, and each groove is used for accommodating a rotor guide bar. The rotor conducting bar is used for cutting magnetic induction lines of the stator to generate induced current, and the sleeve is used for closing notches of the multiple grooves. Leakage inductance of the inner rotor of the asynchronous motor can be reduced so as to effectively improve the overall power performance of the asynchronous motor.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to an asynchronous motor with slots on the outer circumference of a rotor, a power assembly and a vehicle. Background Art

[0002] The powertrain is usually equipped with an AC asynchronous motor and a permanent magnet synchronous motor to work together to drive the vehicle. The existing AC asynchronous motor is limited by its own structural design, which results in the inability to effectively improve its torque and power at high speeds, thereby failing to effectively improve the overall power performance of the vehicle. Utility Model Content

[0003] The present application provides an asynchronous motor with slots on the outer peripheral surface of the rotor. By optimizing the structural design of the rotor in a targeted manner, the leakage inductance of the rotor can be reduced to effectively improve the high-speed torque and power of the rotor, thereby improving the working performance and life of the asynchronous motor. The present application also provides a powertrain and a vehicle. The present application specifically includes the following technical solutions:

[0004] In a first aspect, the present application provides an asynchronous motor with slots on the outer circumference of a rotor. The asynchronous motor includes a motor shaft, a rotor and a stator. The stator is coaxially sleeved on the periphery of the rotor. The rotor is used to transmit and connect the motor shaft. The rotor includes a rotor core and a sleeve. The outer circumference of the rotor core includes a plurality of grooves. The slot opening of each groove in the radial direction of the asynchronous motor faces the inner circumference of the stator. Each groove is used to accommodate a rotor bar. The rotor bar is used to cut the magnetic flux lines of the stator to generate an induced current. The sleeve is used to close the slot openings of the plurality of grooves.

[0005] The stator of the asynchronous motor of the present application is coaxially sleeved on the periphery of the rotor, and along the radial direction of the asynchronous motor, the rotor and the stator are arranged at intervals, so that the rotor can rotate relative to the stator around its own axis and drive the motor shaft of the asynchronous motor to rotate to output power outward, thereby realizing the function of the asynchronous motor of the present application as a power source to output power outward. Each rotor guide bar is respectively accommodated in a groove, so that the rotor guide bar can cut the magnetic flux lines generated by the stator to generate an induced current, thereby driving the rotor to rotate relative to the stator around its own axis, achieving the effect of rotating the rotor and driving the motor shaft to rotate. At the same time, since the stator is sleeved on the periphery of the rotor, the groove is opened on the outer peripheral surface of the rotor core, and the notch of the radial groove of the asynchronous motor is away from the axis of the rotor. At this time, a sleeve is coaxially sleeved on the periphery of the rotor and the sleeve covers the notch of the groove, so that the inner peripheral surface of the sleeve can form a mutual fit with the groove bottom of the groove to limit the radial displacement of the rotor guide bar along the asynchronous motor, and prevent the rotor guide bar from being affected by centrifugal force during the rotation of the rotor and being thrown out of the groove. That is, the notch of the sleeve covering the groove can fix and support the rotor bars received in the groove, so as to improve the overall structural strength and structural reliability of the asynchronous motor under high-speed rotation of the rotor, and further improve the working performance and life of the asynchronous motor.

[0006] The grooves of the inner rotor of the asynchronous motor of the present application are provided on the outer peripheral surface of the rotor core facing the stator, so that the notches of the grooves face the stator, which can reduce the leakage inductance of the rotor and thus reduce the leakage reactance of the rotor, so as to improve the torque and power of the asynchronous motor under high-speed operation, thereby improving the overall power performance and working performance of the asynchronous motor. At the same time, the asynchronous motor of the present application is provided with a sleeve on the periphery of the rotor core to close the notches of multiple grooves, which can reduce the influence of centrifugal force on the rotor guide bars during the rotation of the rotor, thereby improving the overall structural strength and reliability of the asynchronous motor, and improving the working performance and life of the asynchronous motor of the present application.

[0007] In a possible implementation, the sleeve is made of carbon fiber or glass fiber.

[0008] In this implementation, carbon fiber or glass fiber has high strength and excellent toughness. Carbon fiber or glass fiber is wound around the periphery of the rotor core to form a sleeve, which can ensure the structural strength and reliability of the sleeve and improve the working performance and life of the asynchronous motor.

[0009] In a possible implementation, along the radial direction of the asynchronous motor, the thickness of the sleeve is greater than or equal to 0.25 mm and less than or equal to 2 mm.

[0010] In a possible implementation, the notch of each groove is used to discharge the gas in the groove when casting the rotor guide bar, and each groove is used to accommodate a cast rotor guide bar.

[0011] In this implementation, the groove forms an opening on the outer peripheral surface of the rotor core. When the rotor bars are prepared in each groove by a casting process, the air in the groove can be discharged outward through the notch of the groove. Since the groove extends along the axial direction of the asynchronous motor, compared with the closed groove arranging the gas at the opposite ends of the axial direction of the asynchronous motor, the present application discharges the gas through the notch of the groove of the open structure, which can discharge more gas faster, thereby improving the compactness of the rotor bars, ensuring the yield of the rotor bars, and further improving the overall structural strength and reliability of the asynchronous motor of the present application. In other words, the asynchronous motor of the present application can reduce the rotor leakage inductance and leakage reactance to improve the rotor torque and power while improving the preparation effect and yield of the rotor bars by opening the groove on the outer peripheral surface of the rotor core and forming an open groove structure. At the same time, the rotor bars are prepared by a casting method of casting in the groove, and the cross-sectional shape of the groove along the axial direction of the asynchronous motor is the cross-sectional shape of the rotor bars, thereby reducing the difficulty and precision requirements of the preparation of the rotor bars, and further improving the preparation efficiency of the rotor.

[0012] In a possible implementation, along the circumferential direction of the asynchronous motor, the width of the notch of the groove is greater than the width of the groove bottom of the groove.

[0013] In this implementation, since the slot opening along the radial groove of the asynchronous motor is closer to the stator than the slot bottom, the width of the slot opening along the circumferential direction of the asynchronous motor is greater than the width of the slot bottom, which can further reduce the leakage inductance of the rotor and further reduce the leakage reactance of the rotor.

[0014] In a possible implementation, the ratio of the width of the notch along the circumferential groove of the asynchronous motor to the distance between the notch and the groove bottom along the radial groove of the asynchronous motor is greater than or equal to 0.15 and less than or equal to 0.3.

[0015] In this implementation, the depth-to-width ratio of the groove is between 0.15 and 0.3, so as to reduce the harmonic magnetic field loss while ensuring the reduction effect of the rotor leakage inductance, and further improve the working performance of the asynchronous motor under high-speed rotation state.

[0016] In a possible implementation, along the radial direction of the asynchronous motor, the width of the groove gradually increases from the groove bottom toward the groove opening.

[0017] In a possible implementation, along the circumferential direction of the asynchronous motor, the spacing between the notch openings of any two adjacent notches is equal to the spacing between the bottoms of any two adjacent notches.

[0018] In this implementation, along the circumference of the asynchronous motor, the structure between any two adjacent grooves is constructed as the teeth of the rotor core, that is, along the circumference of the asynchronous motor, the multiple teeth of the rotor core are arranged at intervals and arranged alternately with each tooth between two adjacent grooves. Among them, along the circumference of the asynchronous motor, the two side walls opposite to each other of each tooth are respectively constructed to form two adjacent groove walls of two adjacent grooves. Since the spacing between the notches of two adjacent grooves is equal to the spacing between the bottoms of the grooves, the width of the root and the tooth end of each tooth along the circumference of the asynchronous motor is equal, so that the magnetic lines of force can be evenly distributed in the rotor core, avoiding the situation where the magnetic lines of force are oversaturated and the distribution density is too large at the root position of the tooth, thereby improving the overall working performance of the asynchronous motor.

[0019] In a possible implementation, along the circumferential direction of the asynchronous motor, a distance between the notch openings of any two adjacent notches is smaller than a distance between the bottoms of any two adjacent notches.

[0020] In this implementation, along the circumference of the asynchronous motor, the spacing between the slot openings of two adjacent slots is smaller than the spacing between the slot bottoms, that is, the width of the tooth end of each tooth portion along the circumference of the asynchronous motor is smaller than the width of the tooth root, and the width of the slot opening of each groove along the circumference of the asynchronous motor is greater than the width of the slot bottom, thereby ensuring that the magnetic lines of force are evenly distributed in the rotor core of the rotor, while further reducing the leakage inductance of the rotor and reducing the leakage reactance of the rotor, thereby further improving the overall working performance of the asynchronous motor.

[0021] In a possible implementation, along the circumferential direction of the asynchronous motor, a ratio between a spacing between notch openings of any two adjacent notches and a spacing between groove bottoms of any two adjacent notches is greater than or equal to 0.8 and less than or equal to 1.

[0022] In this implementation, along the circumference of the asynchronous motor, the ratio of the width of the tooth end to the width of the tooth root of each tooth is between 0.8-1, so as to ensure that the groove reduces the effect of rotor leakage inductance while ensuring the uniform distribution of magnetic lines of force in the rotor core, further improving the overall working performance and life of the asynchronous motor.

[0023] In a possible implementation, along the radial direction of the asynchronous motor, two groove walls of each groove are symmetrical along the central axis of the groove.

[0024] In this implementation, the groove is symmetrical about its own central axis, so that the rotor core as a whole can be symmetrically arranged to further improve the rotation performance and stability of the rotor.

[0025] In one possible implementation, the groove includes a first radial segment and a second radial segment, wherein, along the radial direction of the asynchronous motor, the distance between the first radial segment and the notch of the groove is greater than the distance between the second radial segment and the notch of the groove, and along the direction from the bottom of the groove toward the notch, the width of the first radial segment gradually increases, and the width of the second radial segment gradually decreases.

[0026] In this implementation, along the radial direction of the asynchronous motor, since the second radial section is closer to the notch of the groove than the first radial section, and the width of the second radial section gradually decreases, the two groove walls of the groove are brought close to each other in the circumferential direction of the asynchronous motor, so that the two groove walls of the groove can form abutment against the rotor bars at the position of the second radial section to limit the displacement of the rotor bars along the radial direction of the asynchronous motor. In other words, the rotor bars are fixed in the grooves, and the two groove walls of the grooves at the position of the second radial section are brought close to each other to form abutment against the rotor bars, which can further reduce the influence of centrifugal force on the rotor bars during the rotation of the rotor, and further reduce the risk that the rotor bars may be thrown out of the grooves, which can improve the overall structural strength and working stability of the rotor, and further improve the overall working performance and life of the asynchronous motor.

[0027] In a possible implementation, along the radial direction of the asynchronous motor, a ratio between a maximum distance between the second radial segment and the notch of the groove and a depth of the groove is greater than or equal to 0.07 and less than or equal to 0.1.

[0028] In this implementation, the smaller the ratio between the maximum spacing between the second radial section and the notch of the groove and the depth of the groove, the better the effect of reducing the overall leakage inductance of the rotor. In addition, the closer the rotor bars in the groove are to the notch of the groove, the greater the centrifugal force they are subjected to. Therefore, by limiting the ratio between the maximum spacing between the second radial section and the notch of the groove and the depth of the groove to be between 0.07 and 0.1, it is possible to further ensure the retention effect and stability of the rotor bars in the groove while ensuring the effect of reducing the overall leakage inductance of the rotor, so as to reduce the influence of the centrifugal force on the rotor bars.

[0029] In a possible implementation manner, a ratio between the minimum width of the second radial segment and the maximum width of the first radial segment is greater than or equal to 0.3 and less than or equal to 0.6.

[0030] In this implementation, along the circumference of the asynchronous motor, a ratio is established between the minimum width of the second radial segment and the maximum width of the first radial segment, so that the two groove walls of the groove at the position of the second radial segment can be brought closer to each other to reduce the influence of the centrifugal force on the rotor bars, while also ensuring the effect of reducing the leakage inductance and leakage reactance of the rotor. That is, by setting the ratio between the minimum width of the second radial segment and the maximum width of the first radial segment to be between 0.3 and 0.6, the torque and power of the asynchronous motor can be further improved when the asynchronous motor is running at high speed while ensuring the overall structural strength and reliability.

[0031] In a possible implementation, the rotor includes two conductive rings, each conductive ring is used to connect a plurality of rotor bars, wherein the two conductive rings are respectively fixed to two ends of the rotor core along the axial direction of the asynchronous motor.

[0032] In this implementation, along the axial direction of the asynchronous motor, a plurality of rotor bars are arranged between two conductive rings, so that the two conductive rings are respectively connected to the opposite ends of each rotor bar, thereby forming a closed loop between the two conductive rings and the plurality of rotor bars. Since the stator winding generates a rotating magnetic field, an induced current is formed in the closed loop formed by the two conductive rings and the plurality of rotor bars, thereby being able to drive the rotor to rotate relative to the stator.

[0033] In a possible implementation, the two end faces of the rotor core along the axial direction of the asynchronous motor respectively include multiple end face notches, each end face notch is connected to a groove, the multiple end face notches of each end face are used for flowing in or out of the casting material, and the multiple grooves are used to fix multiple rotor guide bars and two conductive rings that are integrally cast.

[0034] In this implementation, since each end face notch is connected to a groove, when the casting material flows in from the end face notch, a casting molding preparation process can be used in each groove to prepare a rotor bar respectively. Alternatively, when the casting material flows out from the end face notch, a conductive ring connected to multiple rotor bars can be prepared as a whole, thereby forming an effect in which the rotor bars and the conductive rings are prepared as a whole. That is, the rotor bars and the two conductive rings are prepared as a whole, which can simplify the preparation process and process of the rotor, eliminate the assembly process between the conductive ring and the multiple rotor bars, and reduce the assembly accuracy requirements between the conductive ring and the rotor bars. On the basis of simplifying the preparation process of the rotor, the connection strength and reliability between the conductive ring and the rotor bars can be improved, and the overall preparation efficiency and yield rate of the asynchronous motor can be further improved.

[0035] In a possible implementation, the outer diameter of the conductive ring is equal to the outer diameter of the rotor core, wherein, along the axial direction of the asynchronous motor, the length of the sleeve is greater than the length of the rotor bar, and along the radial direction of the asynchronous motor, the sleeve is used to cover at least a portion of the conductive ring close to the rotor bar.

[0036] In this implementation, along the radial direction of the asynchronous motor, the outer peripheral surface of the conductive ring is flush with the outer peripheral surface of the rotor core, so that the two opposite ends of the sleeve along the axial direction of the asynchronous motor can extend toward the two conductive rings respectively, that is, the sleeve can cover the conductive ring, thereby limiting the radial displacement of the conductive ring along the asynchronous motor. That is, the sleeve extends continuously toward the conductive ring along the axial direction of the asynchronous motor, so that the sleeve can form a supporting effect on the connection position between the conductive ring and the multiple rotor bars, so as to improve the structural strength of the connection position between the conductive ring and the multiple rotor bars, and further improve the working performance and life of the asynchronous motor. In addition, the sleeve at least partially covers the conductive ring, which can improve the structural strength and reliability of the conductive ring, and avoid the conductive ring from being affected by centrifugal force and possibly breaking.

[0037] In a possible implementation, the outer diameter of the conductive ring is equal to the outer diameter of the rotor core, the length of the conductive ring along the axial direction of the asynchronous motor is L, and the length of the conductive ring covered by either end of the sleeve is greater than or equal to L / 4 and less than or equal to L.

[0038] In a possible implementation, the outer diameter of the conductive ring is greater than the outer diameter of the rotor core, wherein along the axial direction of the asynchronous motor, the length of the sleeve is equal to the length of the rotor bar, and the sleeve is arranged between two conductive rings.

[0039] In this implementation, since the outer diameter of the conductive ring is larger than the outer diameter of the rotor core, the connection surface between the conductive ring and the plurality of rotor bars is perpendicular to the axial direction of the asynchronous motor, so the connection position between the conductive ring and the plurality of rotor bars is less affected by centrifugal force when the rotor rotates. At this time, along the axial direction of the asynchronous motor, the extension length of the sleeve is equal to the length of the groove, which can reduce the preparation cost of the asynchronous motor while ensuring that the sleeve improves the structural strength and reliability of the rotor bars.

[0040] In a possible implementation, the outer diameter of the conductive ring is larger than the outer diameter of the rotor core, wherein the sleeve includes a first sub-sleeve and two second sub-sleeves, the first sub-sleeve is sleeved on the periphery of the rotor core, and each second sub-sleeve is coaxially sleeved on the periphery of a conductive ring, and the outer diameter of the second sub-sleeve is smaller than or equal to the outer diameter of the first sub-sleeve.

[0041] In this implementation, a second sub-sleeve is arranged outside the conductive ring, which can improve the overall structural strength and reliability of the conductive ring. At the same time, along the radial direction of the asynchronous motor, the outer circumference of the second sub-sleeve is flush with the outer circumference of the first sub-sleeve, so that the rotor has a continuous and flat outer circumference, so as to improve the assembly effect between the rotor and the stator in the asynchronous motor, and further improve the working performance of the asynchronous motor.

[0042] In a possible implementation, along the axial direction of the asynchronous motor, the length of the second sub-sleeve is greater than or equal to L / 4 and less than or equal to L.

[0043] In a possible implementation, along the radial direction of the asynchronous motor, the length of the rotor bar is equal to the depth of the groove.

[0044] In this implementation, since the sleeve is sleeved on the periphery of the rotor core, the inner circumference of the sleeve fits the outer circumference of the rotor core, and since the groove is opened on the outer circumference of the rotor core, the inner circumference of the sleeve completely covers the notch of the groove, thereby forming the effect of closing the notch of the groove. At this time, in the radial direction of the asynchronous motor, the outer circumference of the rotor bar is flush with the notch of the groove, that is, the outer circumference of the rotor bar is flush with the outer circumference of the rotor core, so that the outer circumference of the rotor bar away from the axis of the asynchronous motor can fit with the inner circumference of the sleeve, and then the sleeve can cooperate with the groove bottom of the groove, which can hold the rotor bar in the groove, and limit the displacement of the rotor bar along the radial direction of the asynchronous motor, so as to avoid the rotor bar shaking in the groove.

[0045] In a possible implementation, along the radial direction of the asynchronous motor, the distance between the inner circumference of the stator and the outer circumference of the sleeve of the rotor is W, and the thickness of the sleeve is greater than or equal to 0.5W and less than or equal to 2W.

[0046] In this implementation, after the stator in the asynchronous motor is coaxially sleeved on the periphery of the rotor, since the thickness of the radial sleeve along the asynchronous motor is 0.5-2 times the spacing width between the stator and the sleeve, the rotation effect of the rotor relative to the stator can be guaranteed, and the sleeve can reduce the cost of the sleeve while improving the overall structural strength and reliability of the rotor, thereby reducing the preparation cost of the asynchronous motor.

[0047] In a possible implementation, along the circumferential direction of the asynchronous motor, the width of the notch of the groove is greater than the width of the groove bottom of the groove, and the thickness of the sleeve is greater than or equal to W and less than or equal to 2W.

[0048] In this implementation, when only the sleeve is used to hold the rotor bars in the grooves, the thickness of the sleeve is set between W-2W, that is, the thickness of the sleeve is increased to ensure the structural strength and reliability of the asynchronous motor when the rotor rotates at high speed.

[0049] In a possible implementation, the groove includes a first radial segment and a second radial segment, and a thickness of the sleeve is greater than or equal to 0.5W and less than or equal to W.

[0050] In this implementation, when the two groove walls of the groove at the second radial section position are close to each other to form abutment against the rotor bars, the two groove walls of the groove are specifically designed so that the groove itself can form a fixation for the rotor bars received in the groove to reduce the influence of centrifugal force on the rotor bars. Therefore, the groove and the sleeve can work together to further reduce the influence of centrifugal force on the rotor bars when the rotor rotates at high speed, thereby ensuring the overall structural strength and reliability of the asynchronous motor. That is, by setting the thickness of the sleeve to be between 0.5WW, while ensuring the fixation effect of the rotor bars received in the groove, the thickness of the sleeve is reduced to reduce the overall volume of the rotor and realize the miniaturization design of the asynchronous motor, and at the same time, the preparation cost of the asynchronous motor can be reduced.

[0051] In a second aspect, the present application also provides a power assembly, including a reducer and an asynchronous motor provided by any of the above-mentioned implementation methods, wherein the asynchronous motor is transmission-connected to the reducer and is used to output power.

[0052] The asynchronous motor in the powertrain provided by the present application is connected to the input shaft of the reducer in a driving manner, so that the asynchronous motor can output power to the reducer. The powertrain is equipped with an asynchronous motor in any of the above-mentioned implementations. Since the asynchronous motor in any of the above-mentioned implementations reduces the leakage inductance of the rotor and improves the power performance of the asynchronous motor by setting grooves on the outer circumferential surface of the rotor, the working performance of the powertrain can be improved. That is, because the asynchronous motor in any of the above-mentioned implementations is used, the powertrain of the present application has all possible beneficial effects provided by any of the above-mentioned implementations.

[0053] In a third aspect, the present application also provides a vehicle, comprising wheels and a powertrain provided by any of the above-mentioned implementations, wherein the powertrain is fixedly connected to the body of the vehicle and is used to drive the wheels.

[0054] The powertrain of the vehicle provided in the present application is connected to the wheels in a transmission manner, so that the power output by the asynchronous motor is transmitted to the reducer, and then transmitted to the wheels through the reducer, so as to achieve the effect of driving the wheels to rotate and then driving the vehicle to travel. The vehicle of the present application is equipped with the powertrain in any of the above-mentioned implementations, which can improve the working performance and life of the vehicle of the present application. That is, because the powertrain in any of the above-mentioned implementations is used, the vehicle of the present application has all the possible beneficial effects of the powertrain provided by any of the above-mentioned implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0056] Figure 1 A schematic diagram of a working scenario of a powertrain provided in an embodiment of the present application;

[0057] Figure 2 A schematic diagram of the planar structure of an asynchronous motor of a power assembly provided in an embodiment of the present application;

[0058] Figure 3 A schematic diagram of the appearance structure of an asynchronous motor of a power assembly provided in an embodiment of the present application with some structures hidden;

[0059] Figure 4 A schematic cross-sectional structure diagram of an asynchronous motor of a power assembly provided in an embodiment of the present application with part of the structure hidden;

[0060] Figure 5 A schematic diagram of the planar structure of the rotor of the asynchronous motor provided in an embodiment of the present application from a side perspective;

[0061] Figure 6 A schematic diagram of a partial cross-sectional structure of a rotor of an asynchronous motor provided in an embodiment of the present application;

[0062] Figure 7 A schematic diagram of a partial planar structure of a rotor of an asynchronous motor provided in an embodiment of the present application;

[0063] Figure 8 A schematic diagram of a partial planar structure of a rotor of an asynchronous motor provided in an embodiment of the present application;

[0064] Fig. 9 A schematic diagram of the planar structure of the rotor of the asynchronous motor provided in an embodiment of the present application;

[0065] Fig.10 A schematic diagram of a partial planar structure of a rotor of an asynchronous motor provided in an embodiment of the present application;

[0066] Fig.11 A schematic diagram of a partial planar structure of a rotor of an asynchronous motor provided in an embodiment of the present application;

[0067] Fig.12 A schematic diagram of the appearance structure of an asynchronous motor provided in an embodiment of the present application;

[0068] Fig.13 A schematic cross-sectional structure diagram of an asynchronous motor provided in an embodiment of the present application;

[0069] Fig.14 A schematic diagram of the partial cross-sectional structure of the rotor of the asynchronous motor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection claimed in the present application.

[0071] The present application provides an asynchronous motor with slots on the outer circumference of a rotor, the asynchronous motor comprising a motor shaft, a rotor and a stator, the stator being coaxially sleeved on the outer periphery of the rotor, the rotor being used for transmission connection with the motor shaft, the rotor comprising a rotor core and a sleeve, the outer circumference of the rotor core comprising a plurality of grooves, the notch of each groove along the radial direction of the asynchronous motor facing the inner circumference of the stator, each groove being used to accommodate a rotor guide bar, the rotor guide bar being used to cut the magnetic flux lines of the stator to generate an induced current, and the sleeve being used to close the notches of the plurality of grooves. The asynchronous motor of the present application can reduce the leakage inductance of the rotor and thus reduce the leakage reactance of the rotor by arranging a plurality of grooves on the outer circumference of the rotor, so as to improve the torque and power of the asynchronous motor at high speed, and thus improve the overall power performance and working performance of the asynchronous motor.

[0072] The present application provides a powertrain, including a reducer and an asynchronous motor provided by the above implementation, wherein the asynchronous motor is connected to the reducer in a transmission manner and is used to output power. The asynchronous motor carried by the powertrain of the present application is provided with grooves on the outer peripheral surface of the rotor to reduce the leakage inductance of the rotor and improve the power performance of the asynchronous motor, thereby improving the working performance of the powertrain.

[0073] The present application provides a vehicle, including wheels and a powertrain provided by the above implementation, the powertrain being fixedly connected to the vehicle body and used to drive the wheels. The vehicle of the present application is equipped with the powertrain in the above implementation, thereby improving the working performance and life of the vehicle.

[0074] See also Figure 1 , Figure 1 Schematic diagram of the working scene of the powertrain 1000 provided in the embodiment of the present application. The powertrain 1000 includes an asynchronous motor 100 and a reducer 101. The asynchronous motor 100 is fixed in the powertrain 1000 of the vehicle body and is in transmission connection with the reducer 101. Specifically, the motor shaft of the asynchronous motor 100 (at Figure 2 The motor shaft 30 is shown in FIG. 1 , which is connected to the input shaft of the reducer 101. The asynchronous motor 100 is used to generate driving torque and output power as a power source of the power assembly 1000. The asynchronous motor 100 transmits the output power to the wheels through the reducer 101 to drive the electric vehicle.

[0075] Exemplarily, the reducer 101 includes a gear set 1011 and a plurality of rotating shafts 1012. The gear set 1011 includes a plurality of gears 1011a. At least one gear 1011a is coaxially sleeved on the periphery of each rotating shaft 1012. The gears 1011a mesh with each other to achieve transmission connection between the plurality of rotating shafts 1012.

[0076] At least one rotating shaft 1012 in the reducer 101 serves as a power input shaft 1012a (abbreviated as input shaft 1012a) of the reducer 101 and rotates coaxially with the motor shaft 30 of the asynchronous motor 100, so as to achieve transmission connection with the motor shaft 30 of the asynchronous motor 100. The motor shaft 30 rotates around its own axis and drives the input shaft 1012a to rotate around its own axis, so as to input the power output by the asynchronous motor 100 into the reducer 101. At least one rotating shaft 1012 in the reducer 101 serves as a power output shaft of the reducer 101 and rotates coaxially with the wheel, so as to transmit the power input by the power input shaft out of the reducer 101 and transmit it to the wheel end to drive the wheel to rotate.

[0077] It should be noted that the embodiment of the present application is only illustrative of a possible implementation method in which the reducer 101 transmits the power output by the asynchronous motor 100 to the wheels, but the method of transmitting power by the reducer 101 is not limited to this.

[0078] At the same time, Figure 1In the illustrated embodiment, only the possible functional structures in the powertrain 1000 provided in the embodiment of the present application and the possible structural shapes, sizes, and arrangement positions of each functional structure are used as examples for exemplary introduction, but the functional structural devices in the powertrain 1000 provided in the embodiment of the present application and the structural shapes, sizes, and arrangement positions of each functional structural device are not limited to this. In other embodiments of the present application, the functional structural devices in the powertrain 1000 and the structural shapes, sizes, and arrangement positions of each functional structural device can be adjusted according to actual design requirements and application scenarios, and the embodiment of the present application does not specifically limit this.

[0079] Please also read Figure 2-Figure 4 , Figure 2 This is a schematic diagram of the planar structure of an asynchronous motor 100 of a power assembly 1000 provided in an embodiment of the present application. Figure 3 This is a schematic diagram of the appearance structure of the asynchronous motor 100 of the power assembly 1000 provided in the embodiment of the present application with some structures hidden. Figure 4 The cross-sectional structure diagram of the asynchronous motor 100 of the power assembly 1000 provided in the embodiment of the present application is shown with some structures hidden. In order to clearly illustrate the structure of the rotor 20 of the asynchronous motor 100, Figure 3 and Figure 4 In the illustrated embodiment, structures such as the stator 10 of the asynchronous motor 100 are omitted.

[0080] The asynchronous motor 100 includes a stator 10, a rotor 20 and a motor shaft 30, wherein the rotor 20 is used for transmission connection with the motor shaft 30. Exemplarily, the stator 10 and the rotor 20 are arranged coaxially, and the motor shaft 30 is coaxial with and fixedly connected to the rotor 20. Along the radial direction of the asynchronous motor 100, the rotor 20 and the stator 10 are spaced apart from each other. The rotor 20 can rotate relative to the stator 10 around its own axis. Since the rotor 20 is coaxial with and fixedly connected to the motor shaft 30, when the rotor 20 rotates relative to the stator 10 around its own axis, the motor shaft 30 will be synchronously driven to rotate to output power to the outside, thereby realizing the function of the asynchronous motor 100 as a power source to output power to the outside.

[0081] exist Figure 2-Figure 4 In the illustrated embodiment, the rotor 20 is coaxially sleeved on the periphery of the motor shaft 30, and the rotor 20 is fixedly connected to the motor shaft 30. The stator 10 is coaxially sleeved on the periphery of the rotor 20, and the outer peripheral surface 20a of the rotor 20 faces the inner peripheral surface 10b of the stator 10 along the radial direction of the asynchronous motor 100, and the outer peripheral surface 20a of the rotor 20 is spaced from the inner peripheral surface 10b of the stator 10. The rotor 20 rotates around its own axis and synchronously drives the motor shaft 30 to rotate.

[0082] It should be noted that in Figure 2-Figure 4In the illustrated embodiment, only one possible arrangement of the rotor 20, the stator 10, and the motor shaft 30 in the asynchronous motor 100 is used as an example for exemplary description, but the arrangement of the rotor 20, the stator 10, and the motor shaft 30 of the asynchronous motor 100 provided in the embodiment of the present application is not limited to this. In other embodiments of the present application, the arrangement of the stator 10, the rotor 20, and the motor shaft 30 in the asynchronous motor 100 can be adjusted according to the actual structural design and application scenario of the asynchronous motor 100, and the embodiment of the present application does not specifically limit this.

[0083] Please combine Figure 3 and Figure 4 See also Figure 5 , Figure 5 A schematic diagram of a planar structure from a side view of a rotor 20 of an asynchronous motor 100 provided in an embodiment of the present application. The rotor 20 includes a rotor core 21, a plurality of rotor bars 22, and two conductive rings 23. The outer peripheral surface of the rotor core 21 facing the stator 10 includes a plurality of grooves 211, and the plurality of grooves 211 are arranged at intervals along the circumference of the asynchronous motor 100. Exemplarily, each groove 211 passes through the rotor core 21 along the axial direction of the asynchronous motor 100.

[0084] Each conductive ring 23 is used to connect a plurality of rotor bars 22. In the axial direction of the asynchronous motor 100, two conductive rings 23 are fixed to two ends of the rotor core 21, respectively.

[0085] like Figure 3-Figure 5 As shown, each groove 211 is used to accommodate a rotor bar 22 , and two conductive rings 23 are arranged on both sides of the rotor core 21 along the axial direction of the asynchronous motor 100 . The two conductive rings 23 are fixed to the rotor core 21 and used to conduct each rotor bar 22 .

[0086] It should be noted that in Figure 3-Figure 5 In the illustrated embodiment, only one possible structural shape and size of the groove 211 and one possible connection method between the rotor bars 22 and the conductive ring 23 contained in the groove 211 are used as examples for exemplary description, but the structural shape of the groove 211 and the connection method between the rotor bars 22 and the conductive ring 23 provided in the embodiment of the present application are not limited to this. In other embodiments of the present application, the structural shape, size of the groove 211 and the connection method between the rotor bars 22 and the conductive ring 23 can be adjusted according to the actual structural design and actual application scenarios of the asynchronous motor 100, and the embodiment of the present application does not specifically limit this.

[0087] A plurality of grooves 211 are formed on the outer circumferential surface 21a of the rotor core 21. The notch 211a and the groove bottom 211b of each groove 211 are arranged opposite to each other along the radial direction of the asynchronous motor 100. In addition, along the radial direction of the asynchronous motor 100, the notch 211a of each groove 211 is closer to the inner circumferential surface 10b of the stator 10 than the groove bottom 211b of the groove 211. It can also be understood that the notch 211a of the groove 211 faces the air gap between the rotor 20 and the stator 10.

[0088] Exemplarily, along the circumference of the asynchronous motor 100, a plurality of grooves 211 are evenly and spacedly arranged on the outer circumferential surface 21a of the rotor core 21. Moreover, each groove 211 extends along the axial direction of the asynchronous motor 100 and penetrates to two end surfaces 21c of the rotor core 21 opposite to each other along the axial direction of the asynchronous motor 100. Each rotor bar 22 is respectively accommodated in a groove 211, that is, the number of rotor bars 22 is equal to the number of grooves 211, and a plurality of rotor bars 22 correspond to a plurality of grooves 211 one by one.

[0089] There are two conductive rings 23, which are arranged on opposite sides of the rotor core 21 along the axial direction of the asynchronous motor 100. Figure 3-Figure 5 In the illustrated embodiment, the two conductive rings 23 are both annular structures, and the two conductive rings 23 are coaxially located on opposite sides of the rotor core 21, so that the conductive rings 23 can be electrically connected to the end of each rotor bar 22 exposed from the groove 211, so as to achieve the effect of conducting the two conductive rings 23 and multiple rotor bars 22.

[0090] It can be understood that each rotor bar 22 is respectively accommodated in a groove 211. Since the multiple grooves 211 penetrate the rotor core 21 along the axial direction of the asynchronous motor 100, the two opposite ends of each rotor bar 22 along the axial direction of the asynchronous motor 100 can extend out of the rotor core 21 respectively, or the two conductive rings 23 can be connected to the rotor bars 22 in each groove 211 from the opposite sides of the rotor core 21 along the axial direction of the asynchronous motor 100.

[0091] At the same time, multiple rotor bars 22 are arranged between the two conductive rings 23 along the axial direction of the asynchronous motor 100, so that the two conductive rings 23 are respectively connected to the opposite ends of each rotor bar 22, thereby forming a closed loop between the two conductive rings 23 and the multiple rotor bars 22. Since the winding of the stator 10 generates a rotating magnetic field, an induced current is formed in the closed loop formed by the two conductive rings 23 and the multiple rotor bars 22, thereby driving the rotor 20 to rotate relative to the stator 10.

[0092] See also Figure 6 , Figure 6The schematic diagram of the partial cross-sectional structure of the rotor 20 of the asynchronous motor 100 provided in the embodiment of the present application. The rotor 20 includes a sleeve 24, and the sleeve 24 is used to close the notches 211a of the plurality of grooves 211. Figure 6 As shown, the sleeve 24 is coaxially sleeved on the periphery of the rotor core 21 , and the rotor bars 22 can be fixed in the grooves 211 through the sleeve 24 .

[0093] For example, along the radial direction of the asynchronous motor 100, the length of the rotor bar 22 is equal to the depth of the groove 211. Figure 6 In the illustrated embodiment, the length of the rotor bar 22 can be understood as the distance between the surface of the rotor bar 22 facing the groove bottom 211b of the groove 211 and the surface of the rotor bar 22 facing away from the groove bottom 211b of the groove 211 along the radial direction of the asynchronous motor 100. Figure 8 The depth H2 of the groove 211 shown in FIG. 1 can be understood as the distance between the notch 211 a and the groove bottom 211 b of the groove 211 along the radial direction of the asynchronous motor 100 .

[0094] It can be understood that since the sleeve 24 is sleeved on the periphery of the rotor core 21, the inner circumferential surface of the sleeve 24 is in contact with the outer circumferential surface 21a of the rotor core 21. Since the groove 211 is opened on the outer circumferential surface 21a of the rotor core 21, the inner circumferential surface 24b of the sleeve 24 completely covers the notch 211a of the groove 211, thereby forming an effect of closing the notch 211a of the groove 211. At this time, in the radial direction of the asynchronous motor 100, the outer circumferential surface of the rotor bar 22 is flush with the notch 211a of the groove 211, that is, the outer circumferential surface of the rotor bar 22 is flush with the outer circumferential surface 21a of the rotor core 21, so that the surface of the rotor bar 22 away from the axis of the asynchronous motor 100 can fit with the inner circumferential surface 24b of the sleeve 24, and then the sleeve 24 can cooperate with the groove bottom 211b of the groove 211, which can achieve the effect of holding the rotor bar 22 in the groove 211 and limit the displacement of the rotor bar 22 along the radial direction of the asynchronous motor 100, so as to avoid the rotor bar 22 shaking in the groove 211.

[0095] That is, the sleeve 24 covers the notch 211a of the groove 211 to fix and support the rotor bars 22 received in the groove 211, so as to improve the overall structural strength and structural reliability of the asynchronous motor 100 under high-speed rotation of the rotor 20, and further improve the working performance and life of the asynchronous motor 100.

[0096] In one embodiment, the sleeve 24 is made of carbon fiber or glass fiber. Carbon fiber or glass fiber has high strength and excellent toughness. Carbon fiber or glass fiber is wound around the periphery of the rotor core 21 to form the sleeve 24, which can ensure the structural strength and reliability of the sleeve 24 and improve the working performance and life of the asynchronous motor 100.

[0097] In one embodiment, along the radial direction of the rotor 20 , the thickness W2 of the sleeve 24 is greater than or equal to 0.25 mm and less than or equal to 2 mm.

[0098] The slots in the rotor core of the asynchronous motor's inner rotor used to accommodate the rotor bars are generally closed structures, which results in the inability to effectively increase the torque and power when running at high speeds, thereby failing to effectively improve the overall power performance of the vehicle.

[0099] The groove 211 of the rotor 20 in the asynchronous motor 100 of the present application is opened on the circumferential surface of the rotor core 21 facing the stator 10, so that the notch 211a of the groove 211 faces the stator 10, which can reduce the leakage inductance of the rotor 20 and thus reduce the leakage reactance of the rotor 20, so as to improve the torque and power of the asynchronous motor 100 under high-speed operation, thereby improving the overall power performance and working performance of the asynchronous motor 100. At the same time, the asynchronous motor 100 of the present application is provided with a sleeve 24 on the periphery of the rotor core 21 to close the notches 211a of the plurality of grooves 211, which can reduce the influence of the centrifugal force on the rotor guide bar 22 during the rotation of the rotor 20, thereby improving the overall structural strength and reliability of the asynchronous motor 100, and improving the working performance and life of the asynchronous motor 100 of the present application.

[0100] The asynchronous motor 100 in the powertrain provided in the present application is connected to the input shaft of the reducer in a driving manner, so that the asynchronous motor 100 can output power to the reducer. The powertrain is equipped with the asynchronous motor 100 in any of the above-mentioned implementations. Since the asynchronous motor 100 in any of the above-mentioned implementations reduces the leakage inductance of the rotor 20 and improves the power performance of the asynchronous motor 100 by setting a groove 211 on the outer circumferential surface of the rotor 20, the working performance of the powertrain can be improved. That is, because the asynchronous motor 100 in any of the above-mentioned implementations is used, the powertrain of the present application has all the possible beneficial effects provided by any of the above-mentioned implementations.

[0101] The powertrain of the vehicle provided in the present application is connected to the wheels in a transmission manner, so that the power output by the asynchronous motor 100 is transmitted to the reducer, and then transmitted to the wheels through the reducer, so as to achieve the effect of driving the wheels to rotate and then driving the vehicle to travel. The vehicle of the present application is equipped with a powertrain in any of the above-mentioned implementations, which can improve the working performance and life of the vehicle of the present application. That is, because the powertrain in any of the above-mentioned implementations is used, the vehicle of the present application has all the possible beneficial effects of the powertrain provided by any of the above-mentioned implementations.

[0102] In one embodiment, the two conductive rings 23 and the multiple rotor bars 22 are an integral structure. The two conductive rings 23 and the multiple rotor bars 22 can be integrally prepared and formed by a casting process of casting, which eliminates the assembly process between the conductive rings 23 and the multiple rotor bars 22 and reduces the assembly accuracy requirements between the conductive rings 23 and the rotor bars 22. On the basis of simplifying the preparation process of the rotor 20, the connection strength and reliability between the conductive rings 23 and the rotor bars 22 can be improved, and the overall preparation efficiency and yield rate of the asynchronous motor 100 can be further improved.

[0103] In one embodiment, the notch 211 a of each groove 211 is used to discharge the gas in the groove 211 when casting the rotor bar 22 , and each groove 211 is used to accommodate one rotor bar 22 formed by casting.

[0104] It can be understood that the groove 211 forms an opening on the outer peripheral surface 21a of the rotor core 21. When the rotor bars 22 are prepared in each groove 211 by a casting process, the air in the groove 211 can be discharged outward through the notch 211a of the groove 211. Since the groove 211 extends along the axial direction of the asynchronous motor 100, compared with the method of arranging the gas at the opposite ends of the axial direction of the asynchronous motor in the closed groove, the present application discharges the gas through the notch 211a of the groove 211 with an open structure, which can discharge more gas faster, thereby improving the compactness of the rotor bars 22, ensuring the yield rate of the rotor bars 22, and further improving the overall structural strength and reliability of the asynchronous motor 100 of the present application.

[0105] In other words, the asynchronous motor 100 of the present application can reduce the leakage inductance and leakage reactance of the rotor 20 to improve the torque and power of the rotor 20, and can also improve the preparation effect and yield rate of the rotor bars 22 by opening the groove 211 on the outer peripheral surface of the rotor core 21 and forming an open groove structure. At the same time, the rotor bars 22 are prepared by casting in the groove 211. Along the axial direction of the asynchronous motor 100, the cross-sectional shape of the groove 211 is the cross-sectional shape of the rotor bars 22, thereby reducing the difficulty and precision requirements of the preparation of the rotor bars 22, and further improving the preparation efficiency of the rotor 20.

[0106] For an embodiment, please refer to Figure 5 and Figure 6 The two end faces 21c of the rotor core 21 along the axial direction of the asynchronous motor 100 respectively include a plurality of end face notches 213, each end face notch 213 is connected to a groove 211, and the plurality of end face notches 213 of each end face 21c are used for the inflow or outflow of casting material, and the plurality of grooves 211 are used for fixing the plurality of rotor bars 22 and the two conductive rings 23 integrally cast.

[0107] It can be understood that, since each end surface notch 213 is connected to a groove 211, when the casting material flows in from the end surface notch 213, a casting molding process can be used in each groove 211 to respectively prepare a rotor bar 22. Alternatively, when the casting material flows out from the end surface notch 213, a conductive ring 23 connected to a plurality of rotor bars 22 can be integrally prepared, thereby forming an effect in which the rotor bars 22 and the conductive ring 23 are integrally prepared.

[0108] For an example, see Figure 7 , Figure 7 The schematic diagram of the partial planar structure of the rotor 20 of the asynchronous motor 100 provided in the embodiment of the present application is as follows: Along the circumferential direction of the asynchronous motor 100 , the width of the notch 211 a of the groove 211 is greater than the width of the groove bottom 211 b of the groove 211 .

[0109] The width of the notch 211a of the groove 211 can be understood as the distance between two opposite groove walls 211c of the groove 211 at positions close to the outer peripheral surface 21a of the rotor core 21 along the circumferential direction of the asynchronous motor 100. Figure 7 The width of the groove 211a of the groove 211 is shown as the first width P1. The width of the groove bottom 211b of the groove 211 can be understood as the distance between the two opposite groove walls 211c of the groove 211 at one end of the axis of the rotor 20 along the circumferential direction of the asynchronous motor 100. Figure 7 The width of the groove bottom 211b of the groove 211 is shown as the second width P2. That is, the first width P1 is greater than the second width P2.

[0110] like Figure 7 As shown, along the radial direction of the asynchronous motor 100, the distance between the two groove walls 211c of the groove 211 gradually increases from the groove bottom 211b of the groove 211 toward the groove opening 211a of the groove 211. That is, along the radial direction of the asynchronous motor 100, the width of the groove 211 gradually increases from the groove bottom 211b of the groove 211 toward the groove opening 211a.

[0111] It can be understood that since the slot opening 211a of the radial slot 211 of the asynchronous motor 100 is closer to the stator 10 than the slot bottom 211b, the first width P1 of the slot opening 211a of the slot 211 along the circumferential direction of the asynchronous motor 100 is greater than the second width P2 of the slot bottom 211b of the slot 211, which can further reduce the leakage inductance of the rotor 20 and further reduce the leakage reactance of the rotor 20.

[0112] In one embodiment, along the radial direction of the asynchronous motor 100, the two groove walls 211c of each groove 211 are symmetrical along the central axis of the groove 211. It can be understood that the groove 211 is symmetrical about its own central axis 001, so that the rotor core 21 can be symmetrically arranged as a whole, so as to further improve the rotation performance and stability of the rotor 20.

[0113] In one embodiment, along the circumferential direction of the asynchronous motor 100, the side wall of the rotor bar 22 is in contact with the groove wall 211c of the groove 211. Figure 7 In the illustrated embodiment, along the circumferential direction of the asynchronous motor 100, two opposite side walls of the rotor bar 22 are respectively attached to the two groove walls 211c of the groove 211, so that the two groove walls 211c of the groove 211 can limit the displacement of the rotor bar 22 in the circumferential direction of the rotor 20, thereby preventing the rotor bar 22 from shaking in the groove 211 and affecting the working stability of the asynchronous motor 100, thereby improving the overall working performance and life of the asynchronous motor 100.

[0114] In one embodiment, along the radial direction of the asynchronous motor 100, the surface of the rotor bar 22 facing the groove bottom 211b of the groove 211 is in contact with the groove bottom 211b of the groove 211. Figure 7 In the illustrated embodiment, the radial rotor bars 22 of the asynchronous motor 100 are filled in the grooves 211, and the bottom walls of the rotor bars 22 fit with the groove bottoms 211 b of the grooves 211, so that the grooves 211 can limit the rotor bars 22 in the radial direction of the rotor 20, thereby preventing the rotor bars 22 from shaking in the grooves 211 along the radial direction of the asynchronous motor 100 and affecting the working stability of the asynchronous motor 100, thereby further improving the overall working performance and life of the asynchronous motor 100.

[0115] It can be understood that each wall surface of the rotor guide bar 22 is respectively fitted with the wall surface of the adjacent groove 211, so that the rotor guide bar 22 is completely filled in the groove 211, so that the rotor guide bar 22 can be directly prepared in the groove 211 by casting, which can simplify the preparation process and technology of the rotor 20.

[0116] In one embodiment, along the circumferential direction of the asynchronous motor 100 , the distance between the notches 211 a of any two adjacent notches 211 is equal to the distance between the groove bottoms 211 b of any two adjacent notches 211 .

[0117] Specifically, along the circumferential direction of the asynchronous motor 100, the structure between any two adjacent grooves 211 is the tooth portion 212 of the rotor core 21. Figure 7 In the illustrated embodiment, along the circumferential direction of the asynchronous motor 100, the plurality of teeth 212 of the rotor core 21 are arranged at intervals and each tooth 212 is arranged alternately between two adjacent grooves 211. In particular, along the circumferential direction of the asynchronous motor 100, two opposite side walls of each tooth 212 are respectively constructed to form two adjacent groove walls 211c of two adjacent grooves 211.

[0118] like Figure 7 As shown, along the radial direction of the asynchronous motor 100, the tooth portion 212 has a tooth end 212a and a tooth root 212b opposite to each other, and the tooth end 212a is closer to the notch 211a of the groove 211 than the tooth root 212b. The spacing between the notches 211a of two adjacent grooves 211 is equal to the spacing between the groove bottoms 211b, that is, along the circumferential direction of the asynchronous motor 100, the width U1 of the tooth end 212a of the tooth portion 212 is equal to the width U2 of the tooth root 212b.

[0119] It can be understood that the tooth root 212b and tooth end 212a of each tooth portion 212 are equal in width along the circumferential direction of the asynchronous motor 100, so that the magnetic lines of force can be evenly distributed in the rotor core 21, avoiding the situation where the magnetic lines of force are oversaturated and the distribution density is too high at the tooth root 212b of the tooth portion 212, thereby improving the overall working performance of the asynchronous motor 100.

[0120] For an example, see Figure 8 , Figure 8 The schematic diagram of the partial planar structure of the rotor 20 of the asynchronous motor 100 provided in the embodiment of the present application is as follows: Along the circumferential direction of the asynchronous motor 100 , the spacing between the notches 211 a of any two adjacent notches 211 is smaller than the spacing between the groove bottoms 211 b of two adjacent notches 211 .

[0121] exist Figure 8 In the illustrated embodiment, along the circumferential direction of the asynchronous motor 100, the spacing between the notches 211a of two adjacent notches 211 is smaller than the spacing between the notch bottoms 211b, that is, the width U1 of the tooth end 212a of the tooth portion 212 is smaller than the width U2 of the tooth root 212b, which can further increase the first width P1 of the notch 211a of the notch 211, so as to further improve the leakage inductance and leakage reactance of the rotor 20.

[0122] In other words, along the circumference of the asynchronous motor 100, the width U1 of the tooth end 212a of each tooth portion 212 is smaller than the width U2 of the tooth root 212b, so that the first width P1 of the slot 211a of each groove 211 is further increased compared to the second width P2 of the slot bottom 211b, thereby ensuring that the magnetic lines of force are evenly distributed in the rotor core 21 of the rotor 20 while further reducing the leakage inductance and the leakage reactance of the rotor 20, thereby further improving the overall working performance of the asynchronous motor 100.

[0123] In one embodiment, along the circumferential direction of the asynchronous motor 100 , the ratio of the spacing between the notches 211 a of any two adjacent notches 211 to the spacing between the groove bottoms 211 b of any two adjacent notches 211 is greater than or equal to 0.8 and less than or equal to 1.

[0124] exist Figure 8 In the illustrated embodiment, along the circumferential direction of the asynchronous motor 100, the ratio between the width U1 of the tooth end 212a of the tooth portion 212 and the width U2 of the tooth root 212b is between 0.8 and 1, so as to ensure that the groove 211 reduces the leakage inductance of the rotor 20 while ensuring the uniform distribution of the magnetic lines of force in the rotor core 21, thereby further improving the overall working performance and life of the asynchronous motor 100.

[0125] In one embodiment, along the circumferential direction of the asynchronous motor 100 , the ratio of the first width P1 of the notch 211 a of the groove 211 to the spacing between the notch 211 a and the groove bottom 211 b of the radial groove 211 of the asynchronous motor 100 is greater than or equal to 0.15 and less than or equal to 0.3.

[0126] like Figure 8 As shown, the ratio of the first width P1 of the notch 211a of the groove 211 to the depth H2 of the groove 211 can be understood as the width-to-depth ratio of the groove 211. The larger the width-to-depth ratio of the groove 211, the better the leakage inductance reduction effect of the rotor 20.

[0127] It can be understood that by setting the depth-to-width ratio of the groove 211 to be between 0.15 and 0.3, the leakage inductance of the rotor 20 can be reduced while reducing harmonic magnetic field losses, thereby further improving the working performance of the asynchronous motor 100 in a high-speed rotation state.

[0128] For an embodiment, please refer to Fig. 9 and Fig.10 , Fig. 9 Schematic diagram of the planar structure of the rotor 20 of the asynchronous motor 100 provided in an embodiment of the present application, Fig.10A schematic diagram of a partial planar structure of the rotor 20 of the asynchronous motor 100 provided in an embodiment of the present application. The groove 211 includes a first radial section 2111 and a second radial section 2112. In the radial direction of the asynchronous motor 100, the distance between the first radial section 2111 and the notch 211a of the groove 211 is greater than the distance between the second radial section 2112 and the notch 211a of the groove 211. Along the direction from the groove bottom 211b of the groove 211 toward the notch 211a, the width of the first radial section 2111 gradually increases, and the width of the second radial section 2112 gradually decreases.

[0129] exist Fig. 9 and Fig.10 In the illustrated embodiment, along the radial direction of the asynchronous motor 100, the first radial section 2111 is closer to the groove bottom 211b of the groove 211 than the second radial section 2112. The gradual increase in the width of the first radial section 2111 can be understood as the distance between the two groove walls 211c of the groove 211 at the position of the first radial section 2111 gradually increases along the direction from the groove bottom 211b of the groove 211 toward the groove opening 211a. The gradual decrease in the width of the second radial section 2112 can be understood as the distance between the two groove walls 211c of the groove 211 at the position of the second radial section 2112 gradually decreases along the direction from the groove bottom 211b of the groove 211 toward the groove opening 211a.

[0130] It can be understood that, along the radial direction of the asynchronous motor 100, since the second radial section 2112 is closer to the notch 211a of the groove 211 than the first radial section 2111, and the width of the second radial section 2112 gradually decreases, in the circumferential direction of the asynchronous motor 100, the two groove walls 211c of the groove 211 are brought closer to each other, so that the two groove walls 211c of the groove 211 can form abutment against the rotor bars 22 at the position of the second radial section 2112, so as to limit the displacement of the rotor bars 22 along the radial direction of the asynchronous motor 100.

[0131] In other words, the rotor bars 22 are fixed in the grooves 211, and the two groove walls 211c of the grooves 211 at the second radial section 2112 are close to each other to form abutment against the rotor bars 22, which can further reduce the influence of centrifugal force on the rotor bars 22 during the rotation of the rotor 20, and further reduce the risk that the rotor bars 22 may be thrown out of the grooves 211, which can improve the overall structural strength and working stability of the rotor 20, and further improve the overall working performance and life of the asynchronous motor 100.

[0132] At the same time, the closer to the notch 211a of the groove 211, the greater the centrifugal force on the rotor bars 22. At this time, by arranging the second radial section 2112 closer to the notch of the groove than the first radial section 2111 along the radial direction of the asynchronous motor 100, the second radial section 2112 can fix and resist most of the rotor bars 22 accommodated in the groove 211, thereby improving the fixing effect of the groove 211 on the rotor bars 22 as a whole, and further improving the overall structural strength and working stability of the rotor 20.

[0133] In one embodiment, along the radial direction of the asynchronous motor 100 , a ratio between a maximum distance between the second radial segment 2112 and the notch 211 a of the groove 211 and a depth H2 of the groove 211 is greater than or equal to 0.07 and less than or equal to 0.1.

[0134] Exemplarily, along the radial direction of the asynchronous motor 100, the maximum distance between the second radial segment 2112 and the notch 211a of the groove 211 can be understood as the distance between the groove wall 211c of the groove 211 at the position of the second radial segment 2112 and the notch 211a of the groove 211 in the radial direction of the asynchronous motor 100, Fig. 9 and Fig.10 The first spacing H1 is shown in FIG. That is, the ratio between the first spacing H1 and the depth H2 of the groove 211 is between 0.07 and 0.1.

[0135] It can be understood that the smaller the ratio between the first spacing H1 and the depth H2 of the groove 211, the better the overall leakage inductance reduction effect of the rotor 20. In addition, the closer the rotor bars 22 in the groove 211 are to the notch 211a of the groove 211, the greater the centrifugal force they are subjected to. Therefore, by limiting the ratio between the first spacing H1 and the depth H2 of the groove 211 to be between 0.07 and 0.1, the retention effect and stability of the rotor bars 22 in the groove 211 can be further ensured while ensuring the overall leakage inductance reduction effect of the rotor 20, so as to reduce the influence of the centrifugal force on the rotor bars 22.

[0136] In one embodiment, along the circumferential direction of the asynchronous motor 100 , a ratio between a minimum width of the second radial segment 2112 and a maximum width of the first radial segment 2111 is greater than or equal to 0.3 and less than or equal to 0.6.

[0137] exist Fig. 9 and Fig.10 In the embodiment shown, the minimum width of the second radial segment 2112 can be understood as the minimum spacing between the two groove walls 211c of the groove 211 at the position of the second radial segment 2112 along the circumferential direction of the asynchronous motor 100. Fig. 9 and Fig.10It can also be understood that, since the width of the second radial segment 2112 gradually decreases from the groove bottom 211b of the groove 211 toward the groove opening 211a along the radial direction of the asynchronous motor 100, the minimum width of the second radial segment 2112 is the width of the second radial segment 2112 away from the groove bottom 211b of the groove 211.

[0138] The maximum width of the first radial section 2111 can be understood as the maximum spacing between the two groove walls 211c of the groove 211 at the position of the first radial section 2111 along the circumferential direction of the asynchronous motor 100. Fig. 9 and Fig.10 It can also be understood that, since the width of the first radial segment 2111 gradually increases from the groove bottom 211b of the groove 211 toward the groove opening 211a along the radial direction of the asynchronous motor 100, the maximum width of the first radial segment 2111 is the width of the first radial segment 2111 away from the groove bottom 211b of the groove 211.

[0139] It can be understood that a ratio is established between the minimum width of the second radial segment 2112 along the circumference of the asynchronous motor 100 and the maximum width of the first radial segment 2111, that is, the third spacing H3 and the fourth spacing H4 form a ratio, which can enable the two groove walls 211c of the groove 211 at the position of the second radial segment 2112 to move closer to each other to reduce the influence of the centrifugal force on the rotor guide bar 22, while also ensuring the reduction of the leakage inductance and leakage reactance of the rotor 20.

[0140] That is, by setting the ratio between the minimum width of the second radial segment 2112 and the maximum width of the first radial segment 2111 to be between 0.3 and 0.6, the torque and power of the asynchronous motor 100 can be further improved when running at high speed while ensuring the overall structural strength and reliability of the asynchronous motor 100.

[0141] It should be noted that in Fig. 9 and Fig.10 In the illustrated embodiment, only one possible implementation of the groove 211 is used as an example for exemplary introduction, but the structural shape and structural dimensions of the first radial segment 2111 and the second radial segment 2112 of the groove 211 of the present application are not limited to this. In other embodiments of the application, the structural shape and dimensions of the first radial segment 2111 and the second radial segment 2112 of the groove 211 disposed on the outer circumferential surface of the rotor core 21 can be adjusted according to the actual design requirements and application scenarios of the asynchronous motor 100, and the embodiment of the present application does not specifically limit this.

[0142] For example, in one possible embodiment, see Fig.11 , Fig.11The schematic diagram of the partial plan structure of the rotor 20 of the asynchronous motor 100 provided in the embodiment of the present application. In order to clearly illustrate the structural shape in the groove 211, Fig.11 In the embodiment shown, only one of the grooves 211 is used as an example for illustrative description. The cross-sectional shapes of the groove 211 at the first radial section 2111 and the second radial section 2112 can be adjusted according to the actual design requirements of the rotor 20 or the asynchronous motor 100 of the present application.

[0143] like Fig.11 As shown in (a), along the axial direction of the asynchronous motor 100, the cross-sectional shape of the groove 211 at the second radial section 2112 may be, but is not limited to, a straight line extending continuously to the circumference of the rotor core 21. It may also be as follows Fig.11 As shown in (b), along the axial direction of the asynchronous motor 100, the cross-sectional shape of the groove 211 at the second radial section 2112 may be, but is not limited to, an arc line that continuously extends to the circumference of the rotor core 21. Fig.11 In the embodiments shown in (a) and (b), by setting the cross-sectional shape of the groove 211 at the position of the second radial section 2112 to be different, the rotor 20 can adapt to asynchronous motors 100 with different strength requirements and different application scenarios. While improving the support and fixing effect of the rotor guide bars 22 in the groove 211, the application scope of the asynchronous motor 100 of the present application can also be improved.

[0144] For an embodiment, please refer to Fig.12 and Fig.13 , Fig.12 This is a schematic diagram of the appearance structure of the asynchronous motor 100 provided in the embodiment of the present application. Fig.13 Schematic diagram of the cross-sectional structure of the asynchronous motor 100 provided in the embodiment of the present application. Fig.12 and Fig.13 As shown, the outer diameter D1 of the conductive ring 23 is equal to the outer diameter D2 of the rotor core 21. In the axial direction of the asynchronous motor 100, the length of the sleeve 24 is greater than the length of the rotor bars 22. In the radial direction of the asynchronous motor 100, the sleeve 24 is used to cover at least a portion of the conductive ring 23 close to the rotor bars 22.

[0145] like Fig.12 and Fig.13 As shown, the length L2 of the sleeve 24 is greater than the length L3 of the groove 211, and the inner circumferential surface 24b of the sleeve 24 completely covers the notch 211a of the groove 211 in the axial direction of the asynchronous motor 100. Along the axial direction of the asynchronous motor 100, the two ends of the sleeve 24 extend from the two ends of the rotor core 21, respectively, so that the inner circumferential surface 24b of the sleeve 24 at least partially fits the outer circumferential surface 23a of the conductive ring 23.

[0146] Exemplarily, along the axial direction of the asynchronous motor 100, opposite ends of the rotor bars 22 are respectively connected to the conductive rings 23 arranged on both sides of the rotor core 21, and the length L2 of the sleeve 24 is greater than the length L3 of the groove 211, so that the sleeve 24 can completely cover the notch 211a of the groove 211, so as to improve the holding effect of the rotor bars 22 at various positions in the groove 211, thereby ensuring the overall structural strength and reliability of the rotor bars 22 when the rotor 20 rotates at high speed.

[0147] At the same time, the outer circumferential surface 23a of the conductive ring 23 is flush with the outer circumferential surface 21a of the rotor core 21 along the radial direction of the asynchronous motor 100, so that the two opposite ends of the sleeve 24 along the axial direction of the asynchronous motor 100 can respectively extend toward the conductive ring 23, so that the inner circumferential surface 24b of the sleeve 24 can fit to the outer circumferential surface 23a of the conductive ring 23, thereby limiting the radial displacement of the conductive ring 23 along the asynchronous motor 100.

[0148] It can be understood that, along the radial direction of the asynchronous motor 100, the outer circumferential surface 23a of the conductive ring 23 is flush with the outer circumferential surface 21a of the rotor core 21, so that the two opposite ends of the sleeve 24 along the axial direction of the asynchronous motor 100 can extend toward the two conductive rings 23 respectively, that is, the sleeve 24 can cover the conductive ring 23, thereby limiting the radial displacement of the conductive ring 23 along the asynchronous motor 100. That is, the sleeve 24 extends continuously toward the conductive ring 23 along the axial extension of the asynchronous motor 100, so that the sleeve 24 can form a supporting effect on the connection position of the conductive ring 23 and the plurality of rotor bars 22, so as to improve the structural strength of the connection position of the conductive ring 23 and the plurality of rotor bars 22, and further improve the working performance and life of the asynchronous motor 100.

[0149] Furthermore, the sleeve 24 at least partially covers the conductive ring 23 , which can improve the structural strength and reliability of the conductive ring 23 and prevent the conductive ring 23 from being broken due to the centrifugal force.

[0150] In one embodiment, the outer diameter D1 of the conductive ring 23 is equal to the outer diameter D2 of the rotor core 21 , the length of the conductive ring 23 along the axial direction of the asynchronous motor 100 is L, and the length of the sleeve 24 covering the conductive ring 23 at either end is greater than or equal to L / 4 and less than or equal to L.

[0151] It can be understood that by setting the length of the sleeve 24 covering the conductive ring 23 at either end to be between L / 4-L, the connection strength between the conductive ring 23 and the rotor bar 22 can be ensured while reducing the preparation cost of the asynchronous motor 100.

[0152] In one embodiment, along the radial direction of the asynchronous motor 100, the distance between the inner circumferential surface 10b of the stator 10 and the outer circumferential surface of the sleeve 24 of the rotor 20 is W (eg Figure 2As shown in FIG. 1 ), the thickness W2 of the sleeve 24 is greater than or equal to 0.5W and less than or equal to 2W. After the stator 10 in the asynchronous motor 100 is coaxially sleeved on the outer periphery of the rotor 20, since the thickness W2 of the sleeve 24 along the radial direction of the asynchronous motor 100 is 0.5-2 times the spacing width between the stator 10 and the sleeve 24, the rotation effect of the rotor 20 relative to the stator 10 can be ensured, and the sleeve 24 can improve the overall structural strength and reliability of the rotor 20 while reducing the cost of the sleeve 24 to reduce the manufacturing cost of the asynchronous motor 100.

[0153] In one embodiment, along the radial direction of the asynchronous motor 100, when the distance between the two groove walls 211c of the groove 211 gradually increases from the groove bottom 211b of the groove 211 toward the groove opening 211a, the thickness W2 of the sleeve 24 is greater than or equal to W and less than or equal to 2W. Fig.13 As shown, when only the sleeve 24 is used to hold the rotor bars 22 in the grooves 211, the thickness W2 of the sleeve 24 is set between W-2W, that is, the thickness W2 of the sleeve 24 is increased to ensure the structural strength and reliability of the asynchronous motor 100 when the rotor 20 rotates at high speed.

[0154] In one embodiment, along the radial direction of the asynchronous motor 100, when the spacing between the two groove walls 211c of the groove 211 gradually decreases from the groove bottom 211b of the groove 211 toward the groove opening 211a at the position of the second radial section 2112, the thickness W2 of the sleeve 24 is greater than or equal to 0.5W and less than or equal to W.

[0155] It can be understood that when the two groove walls 211c of the groove 211 gradually approach each other from the groove bottom 211b of the groove 211 toward the groove opening 211a at the position of the second radial section 2112, the two groove walls 211c of the groove 211 approaching each other at the position of the second radial section 2112 can form a retaining force on the rotor guide bar 22 accommodated in the groove 211 to reduce the influence of centrifugal force on the rotor guide bar 22. Therefore, the two groove walls 211c of the groove 211 and the sleeve 24 can work together to further reduce the influence of centrifugal force on the rotor guide bar 22 when the rotor 20 rotates at a high speed, thereby ensuring the overall structural strength and reliability of the asynchronous motor 100.

[0156] That is, by setting the thickness W2 of the sleeve 24 to be between 0.5WW, while ensuring the retention effect of the rotor bars 22 accommodated in the grooves 211, the thickness W2 of the sleeve 24 is reduced to reduce the overall volume of the rotor 20 and realize the miniaturized design of the asynchronous motor 100, and at the same time, the preparation cost of the asynchronous motor 100 can be reduced.

[0157] In one embodiment, the outer diameter D1 of the conductive ring 23 is larger than the outer diameter D2 of the rotor core 21 (eg Figure 4As shown in FIG. 1 ), along the axial direction of the asynchronous motor 100 , the length L2 of the sleeve 24 is equal to the length of the rotor bars 22 , and the sleeve 24 is arranged between the two conductive rings 23 .

[0158] It can be understood that, since the outer diameter D1 of the conductive ring 23 is greater than the outer diameter D2 of the rotor core 21, the connection surface between the conductive ring 23 and the plurality of rotor bars 22 is perpendicular to the axial direction of the asynchronous motor 100, so the connection position between the conductive ring 23 and the plurality of rotor bars 22 is less affected by the centrifugal force when the rotor 20 rotates. At this time, along the axial direction of the asynchronous motor 100, the extension length of the sleeve 24 is equal to the length of the groove 211, which can reduce the preparation cost of the asynchronous motor 100 while ensuring that the sleeve 24 improves the structural strength and reliability of the rotor bars 22.

[0159] See also Fig.14 , Fig.14 The schematic diagram of the partial cross-sectional structure of the rotor 20 of the asynchronous motor 100 provided in the embodiment of the present application. Fig.14 In the illustrated embodiment, the outer diameter D1 of the conductive ring 23 is greater than the outer diameter D2 of the rotor core 21. The sleeve 24 includes a first sub-sleeve 241 and two second sub-sleeves 242. The first sub-sleeve 241 is sleeved on the periphery of the rotor core 21, and each second sub-sleeve 242 is coaxially sleeved on the periphery of a conductive ring 23. The outer diameter of the second sub-sleeve 242 is less than or equal to the outer diameter of the first sub-sleeve 241.

[0160] like Fig.14 As shown, along the axial direction of the asynchronous motor 100, the first sub-sleeve 241 is arranged between the two second sub-sleeves 242. The first sub-sleeve 241 is sleeved on the periphery of the rotor core 21, and the two second sub-sleeves 242 correspond to the two conductive rings 23 one by one and are respectively sleeved on the periphery of the conductive rings 23. The inner circumference 242b of the second sub-sleeve 242 is attached to the outer circumference 23a of the conductive ring 23. Among them, along the axial direction of the asynchronous motor 100, the length of the second sub-sleeve 242 is less than or equal to the length L of the conductive ring 23, and the outer diameter of the second sub-sleeve 242 is less than or equal to the outer diameter of the first sub-sleeve 241.

[0161] It can be understood that when the outer diameter D1 of the conductive ring 23 is greater than the outer diameter D2 of the rotor core 21, the second sub-sleeve 242 is provided on the outer periphery of the conductive ring 23, which can improve the overall structural strength and reliability of the conductive ring 23. At the same time, the outer circumferential surface 242a of the second sub-sleeve 242 is flush with the outer circumferential surface 241a of the first sub-sleeve 241 along the radial direction of the asynchronous motor 100, so that the rotor 20 has a continuous and flat outer circumferential surface, so as to improve the assembly effect between the rotor 20 and the stator 10 in the asynchronous motor 100, and further improve the working performance of the asynchronous motor 100.

[0162] In one embodiment, the length of the second sub-sleeve 242 is greater than or equal to L / 4 and less than or equal to L.

[0163] Of course, the above-mentioned embodiments can be applied individually or in combination. The above is the preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also regarded as the scope of protection of the present application.

Claims

1. An asynchronous motor with slots on the outer peripheral surface of the rotor, It is characterized in that The asynchronous motor comprises a motor shaft, a rotor and a stator, wherein the stator is coaxially sleeved on the periphery of the rotor, and the rotor is used for transmission connection with the motor shaft, and the rotor comprises: A rotor core, wherein the outer circumferential surface of the rotor core comprises a plurality of grooves, wherein the notch of each groove faces the inner circumferential surface of the stator in the radial direction of the asynchronous motor, and each groove is used to accommodate a rotor guide bar, and the rotor guide bar is used to cut the magnetic flux lines of the stator to generate an induced current; A sleeve is used to close the notches of the plurality of grooves.

2. The asynchronous motor according to claim 1, It is characterized in that The notch of each groove is used to discharge the gas in the groove when casting the rotor guide bar, and each groove is used to accommodate one of the cast rotor guide bars.

3. The asynchronous motor according to claim 1, It is characterized in that Along the circumferential direction of the asynchronous motor, the width of the notch of the groove is greater than the width of the groove bottom of the groove.

4. The asynchronous motor according to claim 1, It is characterized in that Along the circumferential direction of the asynchronous motor, the spacing between the notches of any two adjacent grooves is less than or equal to the spacing between the bottoms of the two adjacent grooves.

5. The asynchronous motor according to claim 1, It is characterized in that Along the radial direction of the asynchronous motor, the two groove walls of each groove are symmetrical along the central axis of the groove.

6. The asynchronous motor according to claim 1, It is characterized in that The groove comprises a first radial segment and a second radial segment, wherein: Along the radial direction of the asynchronous motor, the distance between the first radial section and the notch of the groove is greater than the distance between the second radial section and the notch of the groove; Along the direction from the groove bottom toward the notch opening of the groove, the width of the first radial section gradually increases, and the width of the second radial section gradually decreases.

7. The asynchronous motor according to claim 6, It is characterized in that A ratio between a minimum width of the second radial segment and a maximum width of the first radial segment is greater than or equal to 0.3 and less than or equal to 0.

6.

8. The asynchronous motor according to any one of claims 1 to 7, It is characterized in that The rotor comprises two conductive rings, each conductive ring being used to connect a plurality of the rotor bars, wherein: Along the axial direction of the asynchronous motor, the two conductive rings are respectively fixed to two ends of the rotor core.

9. The asynchronous motor according to claim 8, It is characterized in that The two end faces of the rotor core along the axial direction of the asynchronous motor respectively include a plurality of end face notches, each of the end face notches is connected to a groove, the plurality of end face notches of each end face are used for the inflow or outflow of casting material, and the plurality of grooves are used for fixing the plurality of rotor bars and the two conductive rings that are integrally cast.

10. The asynchronous motor according to claim 8, It is characterized in that The outer diameter of the conductive ring is equal to the outer diameter of the rotor core, wherein: Along the axial direction of the asynchronous motor, the length of the sleeve is greater than the length of the rotor bar; In the radial direction of the asynchronous motor, the sleeve is used to cover at least a portion of the conductive ring close to the rotor bars.

11. The asynchronous motor according to claim 8, It is characterized in that The outer diameter of the conductive ring is greater than the outer diameter of the rotor core, wherein: Along the axial direction of the asynchronous motor, the length of the sleeve is equal to the length of the rotor bars, and the sleeve is arranged between the two conductive rings.

12. The asynchronous motor according to claim 8, It is characterized in that The outer diameter of the conductive ring is greater than the outer diameter of the rotor core; wherein: The sleeve comprises a first sub-sleeve and two second sub-sleeves, the first sub-sleeve is sleeved on the periphery of the rotor core, and each of the second sub-sleeves is coaxially sleeved on the periphery of one of the conductive rings; The outer diameter of the second sub-sleeve is smaller than or equal to the outer diameter of the first sub-sleeve.

13. The asynchronous motor according to any one of claims 1 to 7, It is characterized in that Along the radial direction of the asynchronous motor, the length of the rotor bar is equal to the depth of the groove.

14. The asynchronous motor according to any one of claims 1 to 7, It is characterized in that Along the radial direction of the asynchronous motor, the distance between the inner circumferential surface of the stator and the outer circumferential surface of the sleeve of the rotor is W, and the thickness of the sleeve is greater than or equal to 0.5W and less than or equal to 2W.

15. A powertrain, It is characterized in that The power assembly includes a reducer and an asynchronous motor as described in any one of claims 1 to 14, wherein the asynchronous motor is transmission-connected to the reducer and is used to output power.

16. A vehicle, It is characterized in that It comprises wheels and the powertrain as claimed in claim 15, wherein the powertrain is fixedly connected to the body of the vehicle and is used to drive the wheels.

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