Rotor and motor

Abstract

The rotor comprises a rotor shaft and a wind wheel, the rotor shaft comprises a rotating section and a connector section which are connected, an air inlet hole is formed in the rotating section, the rotating central axis of the rotor shaft is located in the air inlet hole, and the air inlet hole extends in the axial direction of the rotor shaft and penetrates through the axial end face of the rotating section in the direction away from the connector section; the connector section is provided with an air outlet hole, the air outlet hole extends in the radial direction of the connector section, one end of the air outlet hole is communicated with the air inlet hole, the other end of the air outlet hole penetrates through the radial outer surface of the connector section, the wind wheel is arranged in the air inlet hole and connected with the rotating section, and the wind wheel is used for blowing airflow in the air inlet hole to the air outlet hole. According to the rotor provided by the invention, at least part of the air inlet of the air inlet hole can be always in an open state, so that the self-absorption heat dissipation effect of the rotor shaft is realized, air flowing into 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, and the reliability of the motor is improved.

Description

Technical Field

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

[0002] Traditional motor design methods, if applied under high-speed and high-temperature conditions, have the problem of difficulty in rotor heat dissipation. For the rotor heat dissipation problem, if the rotor is cooled by oil, it will lead to a complex rotor structure and unstable operation under high-speed conditions. Therefore, for the rotor heat dissipation problem, air cooling is generally used.

[0003] In order to ensure the stability of the rotor structure and the ventilation and heat dissipation effect, as well as the reliability of the connection between the rotor and the external transmission parts, the relevant technology adopts a design scheme of "setting the central part of the rotor's shaft as a solid structure to ensure the reliability of the connection between the rotor and the external transmission parts, and setting a heat dissipation channel at the edge of the shaft, and the motor's heat dissipation fan blows air into the heat dissipation channel to dissipate heat from the rotor." However, since the heat dissipation channel of this design scheme is set at the outer edge of the rotor, the diameter of the heat dissipation channel is small, and during the movement of the rotor, the heat dissipation channel rotates too fast, which makes it difficult for the heat dissipation fan to blow air into the heat dissipation channel, resulting in poor heat dissipation effect of the rotor and unreliable operation of the motor. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a rotor that can ensure that at least a portion of the air inlet of the air inlet is always open, achieving the effect of self-absorption and heat dissipation of the rotor shaft, allowing air to reliably flow into the air inlet, effectively increasing the air flow into the air inlet, improving the heat dissipation effect of the rotor shaft, improving the heat dissipation effect of the rotor, effectively ensuring the operating stability of the motor, and improving the reliability of the motor.

[0005] The present invention also provides a motor having the rotor.

[0006] According to the first aspect of the present invention, the rotor includes: a rotor shaft, including a connected rotating section and a joint section, the rotating section is provided with an air inlet hole, the rotation 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 passes through the axial end surface of the rotating section in a direction away from the joint section, the joint section is provided with an air outlet hole, the air outlet hole extends radially along the joint section, one end of the air outlet hole is connected to the air inlet hole, and the other end of the air outlet hole passes through the radial outer surface of the joint section; a wind wheel is provided in the air inlet hole and connected to the rotating section, the wind wheel is used to blow the airflow in the air inlet hole to the air outlet hole.

[0007] According to the rotor of the present invention, an air inlet is provided on the rotor shaft, and the rotation center axis of the rotor shaft is provided in the air inlet, so that at least a part of the air inlet of the air inlet is always in an open state, so that the cooling fan can reliably blow air into the air inlet, thereby ensuring the heat dissipation effect of the rotor shaft; by arranging a wind wheel in the air inlet, when the rotor rotates, the rotor shaft can drive the wind wheel to rotate, and drive the air from the air inlet to the air outlet, thereby achieving the self-priming heat dissipation effect of the rotor shaft, so that the air can reliably flow to the air inlet, effectively increasing the air flowing into the air inlet, improving the heat dissipation effect of the rotor shaft, improving the heat dissipation effect of the rotor, effectively ensuring the operating stability of the motor, and improving the reliability of the motor.

[0008] According to some embodiments of the present invention, the wind wheel includes axial flow blades, and the axial flow blades are multiple and arranged at intervals along the circumference of the rotating section.

[0009] According to some embodiments of the present invention, the rotor shaft includes a front end shaft, a rear end shaft, an intermediate shaft and a shaft housing, the shaft housing has an assembly hole, the front end shaft, the rear end shaft and the intermediate shaft are all passed through the assembly hole, the front end shaft and the rear end shaft are respectively stopped at the two ends of the intermediate shaft in the 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 is connected to the second through hole and constitutes the air inlet, and the air outlet is provided on the rear end shaft.

[0010] In some embodiments of the present invention, the intermediate shaft is provided with a first slot extending radially along the rotor shaft, the wind wheel is provided with a first protrusion adapted to the first slot, the first protrusion is passed through the first slot, the front end shaft blocks the opening of the first slot away from the rear end shaft, and the front end shaft stops at the end of the first protrusion away from the rear end shaft.

[0011] In some embodiments of the present invention, the front end shaft is provided with a second slot extending radially along the rotor shaft, the wind wheel is provided with a second protrusion adapted to the second slot, the second protrusion is passed through the second slot, the intermediate shaft blocks the opening of the second slot toward the rear end shaft, and the intermediate shaft stops at one end of the second protrusion toward the rear end shaft.

[0012] In other embodiments of the present invention, the intermediate shaft and the shaft housing are spaced apart in the radial direction of the rotor shaft, and the intermediate shaft and the shaft housing jointly define an installation space; the rotor further includes a magnet, and the magnet is disposed in the installation space.

[0013] In other embodiments of the present invention, there are multiple magnets and they are spaced apart along the circumference of the rotor. The rotor also includes a heat-conducting magnetic insulation member, which is sandwiched between two of the magnets to reduce the magnetic leakage coefficient of the magnets.

[0014] According to some optional embodiments of the present invention, in a direction from the rotating section toward the joint section, the air outlet extends obliquely in a radial direction on the joint section.

[0015] According to an embodiment of the second aspect of the present invention, the motor includes: a base having an assembly space; a stator disposed in the assembly space and connected to the base; and a rotor according to an embodiment of the first aspect of the present invention, the rotor being disposed in a central through hole of the stator.

[0016] According to the motor of the present invention, by setting the above-mentioned motor, the self-absorption heat dissipation effect of the rotor shaft can be achieved, the heat dissipation effect of the rotor shaft is improved, the heat dissipation effect of the rotor is improved, the operating stability of the motor is effectively guaranteed, and the reliability of the motor is improved.

[0017] According to some embodiments of the present invention, a heat dissipation groove is provided on the elbow portion corresponding to the stator slot of the stator, and the heat dissipation groove is communicated with the corresponding stator slot.

[0018] In some embodiments of the present invention, each of the stator slots corresponds to a plurality of the heat dissipation slots, and the plurality of heat dissipation slots are arranged at intervals along the circumference of the stator.

[0019] According to some other embodiments of the present invention, the stator has a dual-winding design structure, and the stator includes a main winding and a secondary winding. The main winding is arranged on the side of the stator slot close to the center through hole, and the secondary winding is arranged on the side of the stator slot away from the center through hole.

[0020] In other embodiments of the present invention, the size of the main winding in the radial direction of the stator is a first winding width, the size of the secondary 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.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a stator and a rotor assembled together according to some embodiments of the present invention; Figure 2 yes Figure 1 The main view of the stator and rotor when assembled together; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 yes Figure 1 A side view of the stator and rotor assembled together; Figure 5 yes Figure 4 Cross-sectional view along line BB; Figure 6 yes Figure 1 A cross-sectional diagram of the stator and rotor when assembled together; Figure 7 yes Figure 1 Schematic diagram of the arrangement of the stator winding; Figure 8 yes Figure 6 Schematic diagram of the arrangement of magnets and thermal conductive magnetic isolation members, wherein the arrow on each magnet points to the direction of the magnetic field of the magnet; Figure 9 yes Figure 1 Schematic diagram of a half-section of the rotor in FIG.

[0023] Reference numerals: 100, rotor; 1. Rotating section; 11. Air inlet; 12. Air inlet; 2. Connector section; 21. Air outlet; 22. Air outlet; 31. Front shaft; 311. First through hole; 32. Rear shaft; 33. Intermediate shaft; 331. Second through hole; 34. Shaft housing; 40. Wind wheel; 41. Axial flow fan blade; 51. Magnet; 52. Thermally conductive magnetic isolation component; 600, stator; 61. Center through hole; 62. Stator slot; 63. Heat dissipation slot; 64. Main winding; 65. Auxiliary winding. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0025] The rotor 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0026] Reference Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 and Figure 9 A rotor 100 according to an embodiment of the first aspect of the present invention includes a rotor shaft and a wind wheel 40. The rotor shaft includes a rotating section 1 and a joint section 2 connected to each other. The rotating section 1 is provided with an air inlet 11. The central axis of rotation of the rotor shaft is located within the air inlet 11. Specifically, the central axis of rotation of the rotor shaft can be arranged to coincide with the central axis of the air inlet 11.

[0027] The air inlet hole 11 extends along the axial direction of the rotor shaft and penetrates the axial end surface of the rotating section 1 in a 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 the air inlet 12.

[0028] When the cooling fan of the motor blows air to dissipate heat to the rotor 100 and stator 600 of the motor, since the rotation center axis of the rotor shaft is arranged in the air inlet 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 face of the rotor shaft can at least partially not overlap, that is, the part where the cross-section swept by the air outlet and the cross-section swept by the end face of the rotor shaft do not overlap is always in an open state, so that the cooling fan of the motor can reliably blow air into the air inlet 11 through the non-overlapping part, thereby ensuring the air intake effect of the air inlet 11, increasing the air intake volume of the air inlet 11, and improving the heat dissipation effect of the rotor shaft.

[0029] Reference Figure 4-Figure 6 、 Figure 9 The joint segment 2 is provided with an air outlet hole 21, which extends radially along the joint segment 2, with one end of the air outlet hole 21 connected to the air inlet hole 11, and the other end of the air outlet hole 21 passes through the radial outer surface of the joint segment 2; for example, the opening of the air outlet hole 21 passing through the radial outer surface of the joint segment 2 can be an air outlet 22; for example, the joint segment 2 is used to be connected to an external transmission member, and the part of the joint segment 2 located at the air outlet 22 away from the rotating section 1 is connected to the external transmission member; specifically, the external transmission member can be a gearbox, a worm gear assembly, a rack and pinion assembly or a pulley assembly.

[0030] By arranging the air outlet 21 on the joint section 2 and arranging the air outlet 21 to extend radially along the joint section 2, the joint section 2 can be ensured to have a partially solid structure, so that the joint section 2 and the external transmission member can be reliably connected.

[0031] Reference Figure 2 、 Figure 5 、 Figure 6 and Figure 9The wind wheel 40 is disposed in the air inlet 11 and is connected to the rotating section 1. The wind wheel 40 is used to blow the airflow in the air inlet 11 toward the air outlet 21. For example, the wind wheel 40 includes a plurality of axial flow blades 41, and the plurality of axial flow blades 41 are spaced apart along the circumference of the rotating section 1.

[0032] By arranging the wind wheel 40 in the air inlet 11, when the rotor 100 rotates, the rotor shaft can drive the wind wheel 40 to rotate and drive the air from the air inlet 12 to the air outlet 22, thereby achieving the effect of self-priming and heat dissipation of the rotor shaft, so that the air can reliably flow to the air inlet 11, effectively increasing the air flowing into the air inlet 11, improving the heat dissipation effect of the rotor shaft, improving the heat dissipation effect of the rotor 100, effectively ensuring the operating stability of the motor, and improving the reliability of the motor.

[0033] According to the rotor 100 of the present invention, an air inlet 11 is provided on the rotor shaft, and the rotation center axis of the rotor shaft is provided in the air inlet 11. In this way, at least a portion of the air inlet 12 of the air inlet 11 can be always in an open state, so that the cooling fan of the motor can reliably blow air into the air inlet 11, thereby ensuring the heat dissipation effect of the rotor shaft; by arranging a wind wheel 40 in the air inlet 11, when the rotor 100 rotates, the rotor shaft can drive the wind wheel 40 to rotate, and drive the air from the air inlet 12 to the air outlet 22, thereby achieving the self-priming heat dissipation effect of the rotor shaft, so that the air can reliably flow to the air inlet 11, effectively increasing the air flowing into the air inlet 11, improving the heat dissipation effect of the rotor shaft, improving the heat dissipation effect of the rotor 100, effectively ensuring the operating stability of the motor, and improving the reliability of the motor.

[0034] Reference Figure 5 According to some optional embodiments of the present invention, the air outlet 21 extends obliquely in the radial direction on the joint section 2 in the direction from the rotating section 1 toward the joint section 2. Since the airflow drawn in from the air inlet 12 by the wind wheel 40 can rotate to a certain extent when the rotor shaft drives the wind wheel 40 to rotate, the air outlet 21 is tilted so that the airflow flowing into the air inlet 11 can be smoothly delivered to the air outlet 21 during the rotation process, allowing the airflow to flow quickly through the air inlet 11 and the air outlet 21, reducing the risk of airflow accumulation in the air inlet 11 and causing airflow obstruction, thereby improving the heat dissipation efficiency of the rotor shaft.

[0035] Specifically, refer to Figure 5 The position where the air outlet 21 communicates with the air inlet 11 may be close to the radial edge of the air outlet 21 , so that the airflow flows from the air inlet 11 into the air outlet 21 .

[0036] Reference Figure 1 、 Figure 2 、 Figure 5 and Figure 9According to some embodiments of the present invention, the rotor shaft includes a front shaft 31, a rear shaft 32, an intermediate shaft 33, and a shaft housing 34. The shaft housing 34 has an assembly hole, through which the front shaft 31, the rear shaft 32, and the intermediate shaft 33 are all inserted. The front shaft 31 and the rear shaft 32 respectively abut against the axial ends of the intermediate shaft 33. The front shaft 31 is provided with a first through-hole 311, and the intermediate shaft 33 is provided with a second through-hole 331. The first through-hole 311 and the second through-hole 331 are connected, and the first through-hole 311 and the second through-hole 331 together form the air inlet 11. The air outlet 21 is provided on the rear shaft 32. Specifically, the rotating section 1 includes the front shaft 31 and the intermediate shaft 33, and the joint section 2 includes the rear shaft 32.

[0037] It should be understood that, in order to ensure that the air outlet 22 is not blocked by the shaft housing 34 , the rear end shaft 32 is only partially inserted into the assembly hole, and the air outlet 22 is located outside the assembly hole.

[0038] In the motor, rotor 100 is mounted on the motor base, with the axial ends of the rotor shaft respectively passing through two bearings in the base. The rotor shaft is configured as a front shaft 31, a rear shaft 32, an intermediate shaft 33, and a shaft housing 34. This allows the front shaft 31 and the rear shaft 32 to mate with the two bearings of the motor, providing a high level of structural strength for the front and rear shafts 31 and 32. This allows the intermediate shaft 33 to be made of a material with a relatively low structural strength, thereby reducing the production cost of the rotor shaft and the rotor 100.

[0039] By setting the rotor shaft to a structure of a front end shaft 31, a rear end shaft 32, an intermediate shaft 33 and a shaft housing 34, and setting the air outlet 21 on the rear end shaft 32, the size of the rear end shaft 32 can be made smaller, the processing technology of the air outlet 21 can be simpler, and the processing and production of the air outlet 21 is facilitated, thereby reducing the production cost of the rotor shaft and reducing the production cost of the rotor 100.

[0040] Reference Figure 5 and Figure 9 In some embodiments of the present invention, the intermediate shaft 33 is provided with a first retaining groove extending radially along the rotor shaft, and the wind rotor 40 is provided with a first retaining protrusion adapted to the first retaining groove. The first retaining protrusion is disposed in the first retaining groove, and the front shaft 31 blocks the opening of the first retaining groove facing away from the rear shaft 32, and the front shaft 31 abuts against the end of the first retaining protrusion facing away from the rear shaft 32. For example, the wind rotor 40 may include a rim, axial blades 41, and a first retaining protrusion. The rim is annular, the axial blades 41 are connected to the radial inner surface of the rim, and the first retaining protrusion is connected to the radial outer surface of the rim.

[0041] Through the mutual cooperation of the first clamping groove and the first clamping protrusion, the clamping and limiting structural form can limit the intermediate shaft 33 on the wind wheel 40 in the circumferential direction, that is, the wind wheel 40 is fixed relative to the intermediate shaft 33 in the circumferential direction of the intermediate shaft 33, so that the wind wheel 40 can reliably rotate synchronously with the intermediate shaft 33, that is, the wind wheel 40 can reliably rotate synchronously with the rotor shaft, so that the wind wheel 40 can reliably suck air into the air inlet 11, reliably achieve the effect of self-absorption and heat dissipation of the rotor shaft, and improve the reliability of the rotor 100.

[0042] By using the front end shaft 31 to block the opening of the first slot away from the rear end shaft 32, and using the front end shaft 31 to stop at the end of the first cam away from the rear end shaft 32, the front end shaft 31 can limit the wind wheel 40 in the axial direction of the rotor shaft, reducing or avoiding the risk of the wind wheel 40 shaking in the axial direction of the rotor shaft, so that the wind wheel 40 is reliably fixed relative to the rotor shaft, and the rotor 100 is more stable during rotation.

[0043] In some embodiments of the present invention, a second slot extending radially along the rotor shaft is provided on the front end shaft 31, a second protrusion adapted to the second slot is provided on the wind wheel 40, the second protrusion is passed through the second slot, the intermediate shaft 33 blocks the opening of the second slot toward the rear end shaft 32, and the intermediate shaft 33 stops at one end of the second protrusion toward the rear end shaft 32.

[0044] Through the mutual cooperation of the second card slot and the second card protrusion, the card-limiting structural form can limit the wind wheel 40 in the circumferential direction of the front end shaft 31, that is, the wind wheel 40 is fixed relative to the front end shaft 31 in the circumferential direction of the front end shaft 31, so that the wind wheel 40 can reliably follow the front end shaft 31 to rotate synchronously, that is, the wind wheel 40 can reliably follow the rotor shaft to rotate synchronously, so that the wind wheel 40 can reliably suck air into the air inlet 11, reliably realize the effect of self-absorption and heat dissipation of the rotor shaft, and improve the reliability of the rotor 100.

[0045] By using the intermediate shaft 33 to block the opening of the second slot toward the rear end shaft 32, and using the intermediate shaft 33 to stop at the end of the second protrusion toward the rear end shaft 32, the intermediate shaft 33 can limit the wind wheel 40 in the axial direction of the rotor shaft, reducing or avoiding the risk of the wind wheel 40 shaking in the axial direction of the rotor shaft, so that the wind wheel 40 is reliably fixed relative to the rotor shaft, and the rotor 100 is more stable during rotation.

[0046] Reference Figure 5 and Figure 9 In other embodiments of the present invention, the intermediate shaft 33 and the shaft housing 34 are spaced apart in the radial direction of the rotor shaft, and the intermediate shaft 33 and the shaft housing 34 jointly define an installation space; the rotor 100 further includes a magnet 51, which is disposed in the installation space.

[0047] In this way, the intermediate shaft 33 and the shaft housing 34 can be used to limit the magnet 51 in the radial direction of the rotor shaft, and the front shaft 31 and the rear shaft 32 can be used to limit the magnet 51 in the axial direction of the rotor shaft, thereby ensuring the reliability of the rotor 100 structure.

[0048] At the same time, this also makes the overall structure of the rotor 100 more compact, effectively reducing the space occupied by the rotor 100, and making the overall structure of the motor more compact. Moreover, this also allows the magnet 51 to be closer to the ventilation hole, facilitating heat dissipation of the magnet 51 and improving the heat dissipation effect of the rotor 100.

[0049] Reference Figure 6 and Figure 8 In other embodiments of the present invention, there are multiple magnets 51, and the multiple magnets 51 are arranged at intervals along the circumference of the rotor 100. For example, the multiple magnets 51 can be arranged together in a Halbach array to generate the strongest magnetic field using the least number of magnets.

[0050] The rotor 100 further includes a heat-conducting magnetic shield 52, which is sandwiched between the two magnets 51 to reduce the magnetic flux leakage coefficient of the magnets 51. For example, the heat-conducting magnetic shield 52 can be made of a high thermal conductivity iron-nickel alloy (FeNi50).

[0051] Such a configuration can not only effectively improve the air gap flux density of the rotor 100, but also reduce the flux density of the core yoke of the rotor 100, that is, improve the material utilization rate of the magnet 51, and reduce the core iron loss of the rotor 100, thereby reducing the temperature rise of the rotor 100.

[0052] According to an embodiment of the second aspect of the present invention, the motor comprises: a base, a stator 600, and a rotor 100. The base has an assembly space. For example, bearing seats are provided at both ends of the assembly space of the base, and bearings are provided on the bearing seats. The stator 600 is disposed in the assembly space and is connected to the base. According to the rotor 100 of the embodiment of the first aspect of the present invention, the rotor 100 is inserted into the central through hole 61 of the stator 600. For example, the two ends of the rotor 100 can be inserted into two bearings. For example, a cooling fan can also be connected to the rotor 100 to blow air toward the stator 600 and the rotor 100 during the rotation of the rotor 100 to dissipate heat from the stator 600 and the rotor 100.

[0053] According to the motor of the present invention, by setting the above-mentioned motor, the self-absorption heat dissipation effect of the rotor shaft can be achieved, the heat dissipation effect of the rotor shaft is improved, the heat dissipation effect of the rotor 100 is improved, the operating stability of the motor is effectively guaranteed, and the reliability of the motor is improved.

[0054] Reference Figure 3According to some embodiments of the present invention, heat dissipation slots 63 are provided on the elbows corresponding to the stator slots 62 of the stator 600, and the heat dissipation slots 63 are in communication with the corresponding stator slots 62. The provision of the heat dissipation slots 63 can increase the heat dissipation area of ​​the stator 600, improve the efficiency of heat exchange between the airflow directed toward the stator 600 and the stator 600, and enable the airflow directed toward the stator 600 to carry away more heat, effectively improving the heat dissipation effect on the stator 600, reducing the temperature rise of the stator 600, and improving the stability of the motor.

[0055] Reference Figure 3 In some embodiments of the present invention, each stator slot 62 corresponds to a plurality of heat dissipation slots 63, and the plurality of heat dissipation slots 63 are spaced apart along the circumference of the stator 600. This can further increase the heat dissipation area of ​​the stator 600 and improve the efficiency of heat exchange between the airflow directed toward the stator 600 and the stator 600. This allows the airflow directed toward the stator 600 to remove more heat, effectively improving the heat dissipation effect on the stator 600, reducing the temperature rise of the stator 600, and improving the stability of the motor.

[0056] Reference Figure 7 According to other embodiments of the present invention, stator 600 has a dual-winding design structure, comprising a main winding 64 and a secondary winding 65. The main winding 64 is disposed on the side of the stator slots 62 of stator 600 that is closer to the central through-hole 61, while the secondary winding 65 is disposed on the side of the stator slots 62 that is away from the central through-hole 61. This dual-winding design improves motor safety by disconnecting the secondary winding 65 and reducing frequency and current when the stator winding temperature overheats.

[0057] Reference Figure 7 In other embodiments of the present invention, the dimension of the main winding 64 in the radial direction of the stator 600 is a first winding width, the dimension of the secondary 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 secondary winding 65 can be 7:3.

[0058] 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 air gap magnetic field harmonics can be reduced, and the increase in total harmonic losses 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.

[0059] In the description of the present invention, it is to be understood that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A rotor, characterized in that: include: A rotor shaft comprises a connected rotating section (1) and a joint section (2), wherein the rotating section (1) is provided with an air inlet hole (11), the central axis of rotation of the rotor shaft is located in the air inlet hole (11), the air inlet hole (11) extends along the axial direction of the rotor shaft and penetrates the axial end surface of the rotating section (1) in a direction away from the joint section (2), and 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) is communicated 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); A wind wheel (40) is provided in the air inlet (11) and is connected to the rotating section (1). The wind wheel (40) is used to blow the airflow in the air inlet (11) toward the air outlet (21).

2. The rotor according to claim 1, characterized in that The rotor shaft comprises a front end shaft (31), a rear end shaft (32), an intermediate shaft (33) and a shaft housing (34); the shaft housing (34) has an assembly hole; the front end shaft (31), the rear end shaft (32) and the intermediate shaft (33) are all passed through the assembly hole; the front end shaft (31) and the rear end shaft (32) are respectively stopped at two ends of the intermediate shaft (33) in the axial direction; the front end 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 with each other and constitute the air inlet hole (11); the air outlet hole (21) is provided on the rear end shaft (32).

3. The rotor according to claim 2, characterized in that 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 protrusion adapted to the first clamping groove, the first clamping protrusion is penetrated into the first clamping groove, the front end shaft (31) blocks the opening of the first clamping groove away from the rear end shaft (32), and the front end shaft (31) stops at the end of the first clamping protrusion away from the rear end shaft (32).

4. The rotor according to claim 2, characterized in that The front end shaft (31) is provided with a second clamping groove extending in the radial direction of the rotor shaft, the wind wheel (40) is provided with a second clamping protrusion adapted to the second clamping groove, the second clamping protrusion is penetrated into the second clamping groove, the intermediate shaft (33) blocks the opening of the second clamping groove toward the rear end shaft (32), and the intermediate shaft (33) stops at one end of the second clamping protrusion toward the rear end shaft (32).

5. The rotor according to claim 2, characterized in that The intermediate shaft (33) and the shaft housing (34) are spaced apart in the radial direction of the rotor shaft, and the intermediate shaft (33) and the shaft housing (34) jointly define an installation space; The rotor further comprises a magnet (51), and the magnet (51) is arranged in the installation space.

6. The rotor according to any one of claims 1 to 5, characterized in that In the direction from the rotating section (1) toward the joint section (2), the air outlet hole (21) extends obliquely in the radial direction on the joint section (2).

7. A motor, characterized in that: include: A machine base having an assembly space; A stator (600) is disposed in the assembly space and connected to the base. According to the rotor (100) according to any one of claims 1 to 6, the rotor (100) is inserted into the central through hole (61) of the stator (600).

8. The motor according to claim 7, characterized in that A heat dissipation groove (63) is provided on the elbow portion corresponding to the stator slot (62) of the stator (600), and the heat dissipation groove (63) is communicated with the corresponding stator slot (62).

9. The motor according to claim 7, characterized in that The stator (600) is a double-winding design structure. The stator (600) includes a main winding (64) and a secondary winding (65). The main winding (64) is arranged on a side of the stator slot (62) of the stator (600) close to the central through hole (61), and the secondary winding (65) is arranged on a side of the stator slot (62) away from the central through hole (61).

10. The motor according to claim 9, characterized in that The size of the main winding (64) in the radial direction of the stator (600) is a first winding width, the size of the secondary 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.

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