Rotor and electric machine

Abstract

The application discloses a rotor and a motor. The rotor comprises a rotor shaft and a wind wheel. The rotor shaft comprises a rotating section and a joint section connected with each other. The rotating section is provided with an air inlet hole. The rotating center axis of the rotor shaft is located in the air inlet hole. The air inlet hole extends along the axial direction of the rotor shaft and penetrates the axial end surface of the rotating section in the direction away from the joint section. The joint section is provided with an air outlet hole. The air outlet hole extends along the radial direction of the joint section. One end of the air outlet hole is communicated with the air inlet hole. The other end of the air outlet hole penetrates the radial outer surface of the joint section. The wind wheel is arranged in the air inlet hole and connected with the rotating section. The wind wheel is used for blowing the airflow in the air inlet hole to the air outlet hole. According to the rotor, at least part of the air inlet of the air inlet hole is always in an open state. The self-suction heat dissipation effect of the rotor shaft is realized. The air flowing to the air inlet hole is increased. The heat dissipation effect of the rotor shaft is improved. The heat dissipation effect of the rotor is improved. The operation stability of the motor is effectively ensured. The reliability of the motor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor engineering, and in particular to a rotor and a motor. BACKGROUND

[0002] In a conventional motor design method, if applied in a high-speed high-temperature working condition, there is a problem of difficulty in heat dissipation of the rotor. For the heat dissipation problem of the rotor, if an oil cooling heat dissipation mode is used for the rotor, the structure of the rotor will be complex and the rotor will not be stable in operation in a high-speed working condition. Therefore, for the heat dissipation problem of the rotor, a method of air cooling heat dissipation is generally used.

[0003] In order to ensure the stability of the structure of the rotor and the ventilation and heat dissipation effect, and the connection reliability between the rotor and the external transmission member, in the related art, a design scheme of "arranging the central part of the rotating shaft of the rotor as a solid structure to ensure the connection reliability between the rotor and the external transmission member, arranging a heat dissipation channel at the edge of the rotating shaft, and blowing air to the heat dissipation channel by a heat dissipation fan of the motor to dissipate heat of the rotor" is used. However, since the heat dissipation channel of the design scheme is arranged at the outer edge of the rotor, the diameter of the heat dissipation channel is small, and the rotation speed of the heat dissipation channel is too fast in the movement process of the rotor. This results in that it is difficult for the heat dissipation fan to blow air into the heat dissipation channel, and the heat dissipation effect of the rotor is poor, which results in that the motor is not reliable in operation. SUMMARY

[0004] The present application aims to solve at least one of the technical problems in the prior art. To this end, one object of the present application is to provide a rotor which can keep at least part of the air inlet of the air inlet hole in an open state at all times, achieve the effect of self-suction heat dissipation of the rotor shaft, reliably flow air to the air inlet hole, effectively increase the air flowing into the air inlet hole, improve the heat dissipation effect of the rotor shaft, improve the heat dissipation effect of the rotor, effectively ensure the operation stability of the motor, and improve the reliability of the motor.

[0005] The present application also provides a motor with the above-mentioned rotor.

[0006] According to the rotor of the first aspect of the present application, the rotor shaft includes a rotating section and a joint section connected to each other, the rotating section is provided with an air inlet hole, the center axis of the rotor shaft is located in the air inlet hole, the air inlet hole extends along the axial direction of the rotor shaft and penetrates the axial end surface of the rotating section in the direction away from the joint section, the joint section is provided with an air outlet hole, the air outlet hole extends along the radial direction of the joint section, one end of the air outlet hole is in communication with the air inlet hole, and the other end of the air outlet hole penetrates the radial outer surface of the joint section; and a fan wheel is arranged in the air inlet hole and connected to the rotating section, and the fan wheel is used to blow the air flow in the air inlet hole to the air outlet hole.

[0007] The rotor according to the application can make at least part of the air inlet of the air inlet hole always in an open state by arranging the air inlet hole on the rotor shaft and arranging the rotation center axis of the rotor shaft in the air inlet hole, so that the heat dissipation fan can reliably blow air into the air inlet hole, and the heat dissipation effect of the rotor shaft is ensured; the rotor shaft can drive the air wheel to rotate and drive air to be blown from the air inlet to the air outlet to realize the self-suction heat dissipation effect of the rotor shaft when the rotor rotates, so that air can reliably flow to the air inlet hole, the air flowing to the air inlet hole is effectively increased, the heat dissipation effect of the rotor shaft is improved, the heat dissipation effect of the rotor is improved, the operation stability of the motor is effectively ensured, and the reliability of the motor is improved.

[0008] According to some embodiments of the application, the air wheel comprises axial fan blades, and the axial fan blades are multiple and arranged in a circumferential direction of the rotating section.

[0009] According to some embodiments of the application, the rotor shaft comprises a front end shaft, a rear end shaft, an intermediate shaft and a shaft shell, the shaft shell has an assembly hole, the front end shaft, the rear end shaft and the intermediate shaft are arranged in the assembly hole, the front end shaft and the rear end shaft are respectively arranged at two ends of the intermediate shaft in an axial direction, the front end shaft is provided with a first through hole, the intermediate shaft is provided with a second through hole, the first through hole and the second through hole are communicated and constitute the air inlet hole, and the air outlet hole is arranged on the rear end shaft.

[0010] In some embodiments of the application, the intermediate shaft is provided with a first clamping groove extending in a radial direction of the rotor shaft, the air wheel is provided with a first clamping convex matching the first clamping groove, the first clamping convex is arranged in the first clamping groove, the front end shaft blocks the opening of the first clamping groove away from the rear end shaft, and the front end shaft is arranged at one end of the first clamping convex away from the rear end shaft.

[0011] In some other embodiments of the application, the intermediate shaft and the shaft shell are spaced apart in the radial direction of the rotor shaft, and the intermediate shaft and the shaft shell jointly define a mounting space; the rotor further comprises a magnet, and the magnet is arranged in the mounting space.

[0012] In some other embodiments of the application, the magnet is multiple and arranged in a circumferential direction of the rotor, and the rotor further comprises a heat-conducting magnetic isolation member, and the heat-conducting magnetic isolation member is arranged between two magnets to reduce the magnetic leakage coefficient of the magnet.

[0013] According to some optional embodiments of the application, in the direction of the rotating section towards the joint section, the air outlet hole is inclinedly extended in the radial direction of the joint section.

[0014] The motor according to the second aspect of the present application comprises: a base having an assembly space; a stator arranged in the assembly space and connected with the base; and a rotor according to the first aspect of the present application, which is arranged in the central through hole of the stator.

[0015] The motor according to the present application can realize the self-heat dissipation effect of the rotor shaft, improve the heat dissipation effect of the rotor shaft, improve the heat dissipation effect of the rotor, effectively ensure the operation stability of the motor, and improve the reliability of the motor.

[0016] According to some embodiments of the present application, the stator slots of the stator are provided with heat dissipation grooves on the corresponding U-shaped portions, and the heat dissipation grooves are in communication with the corresponding stator slots.

[0017] In some embodiments of the present application, each stator slot corresponds to a plurality of heat dissipation grooves, and the plurality of heat dissipation grooves are arranged in a circumferential direction of the stator.

[0018] According to some other embodiments of the present application, the stator is a double-winding design structure, and the stator comprises a main winding and an auxiliary winding, the main winding is arranged on one side of the stator slot close to the central through hole, and the auxiliary winding is arranged on the other side of the stator slot away from the central through hole.

[0019] In some other embodiments of the present application, the size of the main winding in the radial direction of the stator is a first winding width, the size of the auxiliary winding in the radial direction of the stator is a second winding width, and the ratio of the first winding width to the second winding width is greater than or equal to 2 and less than or equal to 3.

[0020] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 is a perspective view of the stator and the rotor assembled together according to some embodiments of the present application;

[0023] Figure 2 is Figure 1 is a front view of the stator and the rotor assembled together in

[0024] Figure 3 is Figure 2 is an enlarged view of A in

[0025] Figure 4 is Figure 1side view of the stator and the rotor in the figure assembled together;

[0026] Figure 5 is Figure 4 sectional view along the line B-B;

[0027] Figure 6 is Figure 1 schematic sectional view of the stator and the rotor in the figure assembled together;

[0028] Figure 7 is Figure 1 schematic view of the arrangement of the stator winding in the figure;

[0029] Figure 8 is Figure 6 schematic view of the arrangement of the magnets and the heat-conducting magnetic separator in the figure, wherein the arrow on each magnet points to the direction of the magnetic field of the magnet;

[0030] Figure 9 is Figure 1 schematic half-sectional view of the rotor in the figure.

[0031] Reference Signs:

[0032] 100, rotor;

[0033] 1, rotating section; 11, air inlet hole; 12, air inlet;

[0034] 2, joint section; 21, air outlet hole; 22, air outlet;

[0035] 31, front shaft; 311, first through hole; 32, rear shaft; 33, middle shaft; 331, second through hole; 34, shaft shell;

[0036] 40, wind wheel; 41, axial fan blade;

[0037] 51, magnet; 52, heat-conducting magnetic separator;

[0038] 600, stator;

[0039] 61, central through hole; 62, stator slot; 63, heat dissipation slot; 64, main winding; 65, auxiliary winding. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0041] The rotor 100 according to the embodiments of the present application is described below with reference to the accompanying drawings.

[0042] Referring to Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 9 , the rotor 100 according to the first aspect of the present application comprises: a rotor shaft and a wind wheel 40, the rotor shaft comprises a rotating section 1 and a joint section 2 connected to each other, the rotating section 1 is provided with an air inlet hole 11, and the center axis of rotation of the rotor shaft is located in the air inlet hole 11. Specifically, the center axis of rotation of the rotor shaft can be arranged coincidentally with the center axis of the air inlet hole 11.

[0043] The air inlet hole 11 extends along the axial direction of the rotor shaft, and the air inlet hole 11 penetrates the axial end surface of the rotating section 1 in the direction away from the joint section 2. For example, the opening of the air inlet hole 11 penetrating the axial end surface of the rotating section 1 can be an air inlet 12.

[0044] When the cooling fan of the motor blows the rotor 100 and the stator 600 of the motor to dissipate heat, since the center axis of rotation of the rotor shaft is located in the air inlet hole 11, during the rotation of the rotor shaft, the cross section swept by the air inlet 12 and the cross section swept by the end surface of the rotor shaft at least partially do not coincide, that is, the part of the cross section swept by the air inlet and the cross section swept by the end surface of the rotor shaft do not coincide is always in an open state, so that the cooling fan of the motor can reliably blow air into the air inlet hole 11 through the non-coincidence part, ensuring the air inlet effect of the air inlet hole 11, improving the air inlet amount of the air inlet hole 11, and improving the heat dissipation effect of the rotor shaft.

[0045] Referring to Figures 4-6 , Figure 9 , the joint section 2 is provided with an air outlet hole 21, the air outlet hole 21 extends along the radial direction of the joint section 2, one end of the air outlet hole 21 communicates with the air inlet hole 11, and the other end of the air outlet hole 21 penetrates the radial outer surface of the joint section 2; for example, the opening of the air outlet hole 21 penetrating the radial outer surface of the joint section 2 can be an air outlet 22; for example, the joint section 2 is used to be connected with an external transmission member, and the part of the joint section 2 located away from the rotating section 1 is connected with the external transmission member; specifically, the external transmission member can be a gearbox, a worm and worm assembly, a gear and rack assembly, or a pulley assembly.

[0046] By arranging the air outlet hole 21 on the joint section 2 and arranging the air outlet hole 21 to extend along the radial direction of the joint section 2, the joint section 2 can ensure that part of it is solid, so that the joint section 2 and the external transmission member can be reliably connected.

[0047] Referring to Figure 2 , Figure 5 , Figure 6 and Figure 9The wind wheel 40 is arranged in the air inlet hole 11 and connected with the rotating section 1, and the wind wheel 40 is used for blowing the air flow in the air inlet hole 11 to the air outlet hole 21. For example, the wind wheel 40 comprises axial fan blades 41, and the axial fan blades 41 are arranged in a plurality of and spaced along the circumferential direction of the rotating section 1.

[0048] By arranging the wind wheel 40 in the air inlet hole 11, when the rotor 100 rotates, the rotor shaft can drive the wind wheel 40 to rotate and drive the air to be blown from the air inlet hole 12 to the air outlet hole 22, so as to realize the self-suction heat dissipation effect of the rotor shaft, reliably make the air flow to the air inlet hole 11, effectively increase the air flow to the air inlet hole 11, improve the heat dissipation effect of the rotor shaft, improve the heat dissipation effect of the rotor 100, effectively ensure the operation stability of the motor, and improve the reliability of the motor.

[0049] According to the rotor 100, the air inlet hole 11 is arranged on the rotor shaft, and the rotation center axis of the rotor shaft is arranged in the air inlet hole 11, so that at least part of the air inlet hole 12 of the air inlet hole 11 is always in an open state, so that the heat dissipation fan of the motor can reliably blow the air to the air inlet hole 11, and the heat dissipation effect of the rotor shaft is ensured; by arranging the wind wheel 40 in the air inlet hole 11, when the rotor 100 rotates, the rotor shaft can drive the wind wheel 40 to rotate and drive the air to be blown from the air inlet hole 12 to the air outlet hole 22, so as to realize the self-suction heat dissipation effect of the rotor shaft, reliably make the air flow to the air inlet hole 11, effectively increase the air flow to the air inlet hole 11, improve the heat dissipation effect of the rotor shaft, improve the heat dissipation effect of the rotor 100, effectively ensure the operation stability of the motor, and improve the reliability of the motor.

[0050] With reference to Figure 5 , according to some optional embodiments of the present application, the air outlet hole 21 is inclinedly extended in the radial direction of the joint section 2 in the direction in which the rotating section 1 faces the joint section 2. Since the air flow sucked into the wind wheel 40 from the air inlet hole 12 can be rotated under the driving of the wind wheel 40 when the rotor shaft drives the wind wheel 40 to rotate, the air outlet hole 21 is inclinedly arranged, so that the air flow flowing into the air inlet hole 11 can be smoothly sent into the air outlet hole 21 in the rotating process, the air flow can quickly flow through the air inlet hole 11 and the air outlet hole 21, the risk of air flow accumulation in the air inlet hole 11 and the resulting air flow unsmoothness is reduced, and the heat dissipation efficiency of the rotor shaft is improved.

[0051] Specifically, with reference to Figure 5 , the position at which the air outlet hole 21 communicates with the air inlet hole 11 can be close to the radial edge of the air outlet hole 21, so as to facilitate the air flow from the air inlet hole 11 to the air outlet hole 21.

[0052] With reference to Figure 1 , Figure 2 , Figure 5 and Figure 9According to some embodiments of the present application, the rotor shaft comprises a front shaft 31, a rear shaft 32, an intermediate shaft 33 and a shaft shell 34, the shaft shell 34 has an assembly hole, the front shaft 31, the rear shaft 32 and the intermediate shaft 33 are all arranged in the assembly hole, the front shaft 31 and the rear shaft 32 are respectively abutted on the two ends of the intermediate shaft 33 in the axial direction, the front shaft 31 is provided with a first through hole 311, the intermediate shaft 33 is provided with a second through hole 331, the first through hole 311 and the second through hole 331 are communicated, and the first through hole 311 and the second through hole 331 jointly constitute the air inlet hole 11, and the air outlet hole 21 is arranged on the rear shaft 32. That is, the rotating section 1 comprises the front shaft 31 and the intermediate shaft 33, and the joint section 2 comprises the rear shaft 32.

[0053] It should be understood that, in order to ensure that the air outlet 22 is not blocked by the shaft shell 34, the rear shaft 32 is only partially arranged in the assembly hole, and the air outlet 22 is located outside the assembly hole.

[0054] In the motor, the rotor 100 is arranged on the motor base, and the two ends of the rotor shaft are arranged in the two bearings of the motor base. By arranging the rotor shaft as the front shaft 31, the rear shaft 32, the intermediate shaft 33 and the shaft shell 34, the front shaft 31 and the rear shaft 32 can be arranged to match the two bearings of the motor, and the structural strength of the front shaft 31 and the rear shaft 32 is set to be high, so that the intermediate shaft 33 can be made of a material with a structural strength that is not too high, thereby reducing the production cost of the rotor shaft and the production cost of the rotor 100.

[0055] By arranging the rotor shaft as the front shaft 31, the rear shaft 32, the intermediate shaft 33 and the shaft shell 34, and arranging the air outlet hole 21 on the rear shaft 32, the size of the rear shaft 32 can be small, the processing technology of the air outlet hole 21 is simple, the processing and manufacturing of the air outlet hole 21 is facilitated, the production cost of the rotor shaft is reduced, and the production cost of the rotor 100 is reduced.

[0056] Referring to Figure 5 and Figure 9 In some embodiments of the present application, the intermediate shaft 33 is provided with a first clamping groove extending in the radial direction of the rotor shaft, the wind wheel 40 is provided with a first clamping convex matched with the first clamping groove, the first clamping convex is arranged in the first clamping groove, the front shaft 31 blocks the opening of the first clamping groove away from the rear shaft 32, and the front shaft 31 is abutted on the end of the first clamping convex away from the rear shaft 32. For example, the wind wheel 40 can comprise a rim, axial flow blades 41 and a first clamping convex, the rim is annular, the axial flow blades 41 are connected to the radial inner surface of the rim, and the first clamping convex is connected to the radial outer surface of the rim.

[0057] Through the mutual cooperation of the first clamping slot and the first clamping convex, the clamping limiting structure can limit the wind wheel 40 in the circumferential direction of the middle shaft 33, i.e., fix the wind wheel 40 relative to the middle shaft 33 in the circumferential direction of the middle shaft 33, so that the wind wheel 40 can reliably rotate synchronously with the middle shaft 33, i.e., reliably rotate synchronously with the rotor shaft, thereby reliably enabling the wind wheel 40 to suck air into the air inlet 11 and reliably achieving the self-suction heat dissipation effect of the rotor shaft, and improving the reliability of the rotor 100.

[0058] By plugging the opening of the first clamping slot away from the rear end shaft 32 with the front end shaft 31 and abutting the end of the first clamping convex away from the rear end shaft 32 with the front end shaft 31, the front end shaft 31 can limit the wind wheel 40 in the axial direction of the rotor shaft, reduce or avoid the risk of the wind wheel 40 shaking in the axial direction of the rotor shaft, and reliably fix the wind wheel 40 relative to the rotor shaft, so that the rotor 100 is relatively stable during rotation.

[0059] Referring to Figure 5 and Figure 9 In some other embodiments of the present application, the middle shaft 33 and the shaft shell 34 are spaced apart in the radial direction of the rotor shaft, and the middle shaft 33 and the shaft shell 34 jointly define a mounting space; the rotor 100 further comprises a magnet 51 arranged in the mounting space.

[0060] In this way, the middle shaft 33 and the shaft shell 34 can limit the magnet 51 in the radial direction of the rotor shaft, and the front end shaft 31 and the rear end shaft 32 can limit the magnet 51 in the axial direction of the rotor shaft, thereby ensuring the reliability of the structure of the rotor 100.

[0061] At the same time, this can also make the overall structure of the rotor 100 relatively compact, effectively reduce the occupied space of the rotor 100, and enable the overall structure of the motor to be designed relatively compact. Moreover, this can make the magnet 51 relatively close to the ventilation hole, facilitate heat dissipation of the magnet 51, and improve the heat dissipation effect of the rotor 100.

[0062] Referring to Figure 6 and Figure 8 In some other embodiments of the present application, the magnet 51 is a plurality of magnets, and the plurality of magnets are arranged along the circumferential direction of the rotor 100, for example, the plurality of magnets 51 can be arranged together in a Halbach array to generate the strongest magnetic field with the least number of magnets.

[0063] The rotor 100 further comprises a heat-conducting magnetic isolation member 52 clamped between two magnets 51 to reduce the magnetic leakage coefficient of the magnet 51. For example, the heat-conducting magnetic isolation member 52 can be a high-thermal-conductivity FeNi50 alloy.

[0064] In this way, the air gap magnetic flux of the rotor 100 can be effectively increased, and the magnetic flux of the yoke of the rotor 100 can be reduced, thereby improving the material utilization of the magnet 51, reducing the core loss of the rotor 100, and reducing the temperature rise of the rotor 100.

[0065] According to the motor of the second aspect of the present application, the motor comprises a base, a stator 600 and a rotor 100. The base has an assembly space, for example, the base has bearing seats at two ends of the assembly space, and bearings are arranged on the bearing seats. The stator 600 is arranged in the assembly space and connected to the base. The rotor 100 according to the first aspect of the present application is arranged in the central through hole 61 of the stator 600. For example, the two ends of the rotor 100 can be arranged on the two bearings. For example, a cooling fan can be further connected to the rotor 100 to blow air to the stator 600 and the rotor 100 during rotation of the rotor 100, thereby cooling the stator 600 and the rotor 100.

[0066] According to the motor of the present application, the rotor shaft can be self-cooled, the cooling effect of the rotor shaft is improved, the cooling effect of the rotor 100 is improved, the stability of the motor is effectively ensured, and the reliability of the motor is improved.

[0067] With reference to Figure 3 According to some embodiments of the present application, the stator slot 62 of the stator 600 is provided with a cooling groove 63 corresponding to the corresponding stator slot 62. The cooling groove 63 is in communication with the corresponding stator slot 62. By arranging the cooling groove 63, the cooling area of the stator 600 can be increased, the heat exchange efficiency between the airflow blown to the stator 600 and the stator 600 can be improved, the airflow blown to the stator 600 can carry away more heat, the cooling effect of the stator 600 can be effectively improved, the temperature rise of the stator 600 can be reduced, and the stability of the motor can be improved.

[0068] With reference to Figure 3 In some embodiments of the present application, each stator slot 62 corresponds to a plurality of cooling grooves 63, and the plurality of cooling grooves 63 are arranged in a circumferential direction of the stator 600. In this way, the cooling area of the stator 600 can be further increased, the heat exchange efficiency between the airflow blown to the stator 600 and the stator 600 can be improved, the airflow blown to the stator 600 can carry away more heat, the cooling effect of the stator 600 can be effectively improved, the temperature rise of the stator 600 can be reduced, and the stability of the motor can be improved.

[0069] With reference to Figure 7According to some other embodiments of the present application, the stator 600 is a double-winding design structure, the stator 600 comprises a main winding 64 and a sub-winding 65, the main winding 64 is arranged at one side of the stator slot 62 of the stator 600 close to the central through hole 61, and the sub-winding 65 is arranged at the other side of the stator slot 62 away from the central through hole 61. The double-winding design structure can cut off the sub-winding 65 when the winding temperature of the stator 600 is too high, and can ensure the safe and continuous operation of the motor through the measures such as frequency reduction and flow reduction, thereby improving the safety of the motor.

[0070] With reference to Figure 7 In some other embodiments of the present application, the size of the main winding 64 in the radial direction of the stator 600 is a first winding width, the size of the sub-winding 65 in the radial direction of the stator 600 is a second winding width, and the ratio of the first winding width to the second winding width is greater than or equal to 2 and less than or equal to 3. For example, the ratio of the first winding width to the second winding width can be 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3. Specifically, the ratio of the cross-sectional area of the main winding 64 to the cross-sectional area of the sub-winding 65 can be 7:3.

[0071] By setting the ratio of the first winding width to the second winding width to be greater than or equal to 2 and less than or equal to 3, the generation of harmonics can be effectively suppressed, the increase in the air gap magnetic field harmonics can be reduced, and the total harmonic loss increase can be reduced, thereby effectively reducing the temperature rise of the stator 600 and the rotor 100, improving the heat dissipation effect of the stator 600 and the rotor 100, and improving the stability of the motor.

[0072] In the description of the present application, it should be understood that the relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0073] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0074] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0075] Although embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor characterized by, The rotor shaft comprises a front end shaft (31), a rear end shaft (32), an intermediate shaft (33) and a shaft shell (34), the shaft shell (34) has an assembly hole, the front end shaft (31), the rear end shaft (32) and the intermediate shaft (33) are all arranged in the assembly hole, the front end shaft (31) and the rear end shaft (32) are respectively abutted on the two axial ends of the intermediate shaft (33), the first through hole (311) is arranged on the front end shaft (31), the second through hole (331) is arranged on the intermediate shaft (33), the first through hole (311) and the second through hole (331) are communicated and constitute the air inlet hole (11), and the air outlet hole (21) is arranged on the rear end shaft (32). The intermediate shaft (33) and the shaft shell (34) are spaced apart in the radial direction of the rotor shaft, and the intermediate shaft (33) and the shaft shell (34) jointly define a mounting space. The rotor further comprises a magnet (51), and the magnet (51) is arranged in the mounting space. In the direction of the rotating section (1) towards the joint section (2), the air outlet hole (21) is inclinedly extended in the radial direction of the joint section (2). The rotor (100) according to any one of claims 1-3 is arranged in the central through hole (61) of the stator (600).

2. The rotor of claim 1, wherein The stator slot (62) of the stator (600) is provided with a heat dissipation groove (63) on the corresponding U-shaped part, and the heat dissipation groove (63) is communicated with the corresponding stator slot (62). ​ 3. A rotor according to claim 1 or 2, characterised in that ​ 4. An electric machine characterized by ​ ​ ​ ​ 5. The electric machine of claim 4, wherein, ​ 6. The electric machine of claim 4, wherein, The stator (600) is a double-winding design structure, and the stator (600) comprises a main winding (64) and an auxiliary winding (65), the main winding (64) is arranged on one side of a stator slot (62) of the stator (600) close to the center through hole (61), and the auxiliary winding (65) is arranged on the other side of the stator slot (62) away from the center through hole (61).

7. The electric machine of claim 6, wherein, The size of the main winding (64) in the radial direction of the stator (600) is a first winding width, the size of the auxiliary winding (65) in the radial direction of the stator (600) is a second winding width, and the ratio of the first winding width to the second winding width is greater than or equal to 2 and less than or equal to 3.

Images