Rotor assembly and motor

Abstract

The utility model relates to a rotor assembly and a motor, the electronic assembly comprises a rotor main body, the rotor main body is provided with a cooling air channel, the rotor main body is provided with a first end and a second end which are opposite in the axial direction, and the cooling air channel obliquely extends from the first end to the second end. An air inlet is formed in one of the first end and the second end, and an air outlet is formed in the other one of the first end and the second end. The rotor assembly is good in heat dissipation effect, so that the heat dissipation effect of the motor can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of motor heat dissipation, in particular to a rotor assembly and a motor. BACKGROUND

[0002] In the related art, the motor usually adopts a water cooling mode for heat dissipation. In this mode, a water cooling channel is formed on the casing to allow the flow of cooling water, thereby taking away the heat generated by the operation of the motor. Since the water cooling channel is arranged on the casing, the water cooling heat dissipation mode can only take away the heat generated by the stator assembly, and it is difficult to meet the cooling demand of the rotor assembly, resulting in poor heat dissipation effect of the motor. SUMMARY

[0003] The purpose of the present disclosure is to provide a rotor assembly and a motor, which has a good heat dissipation effect to improve the heat dissipation effect of the motor.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a rotor assembly, comprising a rotor body, wherein a cooling air duct is arranged on the rotor body, the rotor body has opposite first and second ends in the axial direction, the cooling air duct extends obliquely from the first end to the second end, and one of the first and second ends is provided with an air inlet and the other is provided with an air outlet.

[0005] Optionally, the cooling air duct comprises a plurality of sub-flow channels that are in communication with each other, the axes of the plurality of sub-flow channels are parallel to each other, and the projection of any two adjacent sub-flow channels in the axial direction of the rotor body coincides.

[0006] Optionally, the rotor body comprises a plurality of rotor cores, each of the rotor cores is provided with the sub-flow channel, and the plurality of rotor cores are arranged in a stacked manner along the axial direction of the rotor body to form the cooling air duct.

[0007] Optionally, a rotating shaft is included, the rotor body is sleeved on the outside of the rotating shaft, the air inlet is arranged close to the rotating shaft, and the air outlet is arranged away from the rotating shaft.

[0008] Optionally, two end plates are arranged at the two ends of the rotor body, each of the end plates is provided with a first opening and a second opening, the air inlet is in communication with the first opening of one of the two end plates, and the air outlet is in communication with the second opening of the other of the two end plates.

[0009] Optionally, the first opening is configured as a through hole arranged on the end plate, and the second opening is configured as a gap located at the edge of the end plate.

[0010] Optionally, the cooling air duct comprises a first air duct and a second air duct, the first air duct extends obliquely from the first end towards the second end, and the second air duct extends obliquely from the second end towards the first end.

[0011] Optionally, the number of the cooling air ducts is multiple, the multiple cooling air ducts are arranged at intervals along the circumference of the rotor body, and the first air duct and the second air duct are arranged alternately.

[0012] On the basis of the above technical solutions, the disclosure further provides an electric machine, comprising a machine shell, a stator assembly and the above rotor assembly, the stator assembly is fixed with the machine shell, the rotor assembly is arranged in the inside of the stator assembly, the machine shell is provided with a water cooling channel, the cooling air duct has an air outlet and an air inlet, the air outlet is arranged close to the water cooling channel, and the air inlet is arranged away from the water cooling channel.

[0013] Optionally, the stator assembly comprises a stator winding, the stator winding is sleeved outside the rotor assembly, the stator winding has a gap, and the cooling air duct is in communication with the gap.

[0014] Through the above technical solutions, in the rotor assembly provided by the disclosure, the cooling air duct obliquely extends from the first end to the second end of the rotor body, that is, the air outlet and the air inlet of the cooling air duct have different positions in the radial direction of the rotor body, so that when the rotor body rotates, the angular velocities of the air inlet and the air outlet are the same but the linear velocities are different, thereby causing the pressure at the air inlet and the air outlet to be inconsistent, and further forming a pressure difference at the two ends of the cooling air duct, air can enter the cooling air duct from the end with a large pressure, that is, the air inlet, and air can exit from the end with a small pressure, that is, the air outlet, realizing the circulation of air in the rotor body, and further realizing the heat exchange between the air and the rotor body, and improving the heat dissipation capacity of the electric machine. In addition, the oblique extension of the cooling air duct along the axial direction of the rotor body can also provide radial cooling for the rotor body, improve the heat dissipation effect of the rotor assembly, and further improve the heat dissipation effect of the electric machine.

[0015] Other features and advantages of the disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the disclosure and constitute a part of the specification, and together with the specific embodiments below, serve to explain the disclosure but do not constitute a limitation on the disclosure. In the drawings:

[0017] Figure 1 is a structural schematic diagram of a rotor assembly provided by an embodiment of the disclosure;

[0018] Figure 2 is a structural schematic diagram of a motor provided by an embodiment of the present disclosure;

[0019] Figure 3 is a structural schematic diagram of a rotor body and an end plate provided by an embodiment of the present disclosure;

[0020] Figure 4 is a structural schematic diagram of an end plate provided by an embodiment of the present disclosure.

[0021] Legend of reference signs

[0022] 1 - rotor assembly; 11 - rotor body; 111 - first end; 112 - second end; 113 - rotor core; 12 - rotating shaft; 13 - end plate; 131 - first opening; 132 - second opening; 2 - cooling air duct; 21 - branch duct; 22 - air inlet; 23 - air outlet; 24 - first air duct; 25 - second air duct; 3 - stator assembly; 31 - stator winding; 4 - machine shell; 41 - water cooling channel. DETAILED DESCRIPTION

[0023] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0024] In the present disclosure, the orientation words such as "inner" and "outer" used herein generally refer to "inner" and "outer" relative to the self outline of the corresponding component, and the terms "first", "second", etc. are used to distinguish one element from another element, and do not have sequentiality and importance. In addition, in the following description, the same reference signs in different drawings represent the same or similar elements unless otherwise explained. The above definitions are only used to explain and illustrate the present disclosure, and should not be understood as limiting the present disclosure.

[0025] According to the specific embodiments provided by the present disclosure, with reference to Figures 1 to 4 is provided a rotor assembly 1, which includes a rotor body 11, and the rotor body 11 is provided with a cooling air duct 2, the rotor body 11 has opposite first and second ends 111 and 112 in the axial direction, the cooling air duct 2 extends obliquely from the first end 111 to the second end 112, and one of the first and second ends 111 and 112 is provided with an air inlet 22 and the other is provided with an air outlet 23.

[0026] Through the above technical solution, in the rotor assembly provided by the present disclosure, the rotor body 11 is provided with a cooling air duct 2 obliquely extending from the first end 111 to the second end 112 of the rotor body 11, that is, the air outlet 23 and the air inlet 22 of the cooling air duct 2 have different positions in the radial direction of the rotor body 11, so that when the rotor body 11 rotates (with reference toFigure 1 As shown in FIG. 1, the air inlet 22 and the air outlet 23 have the same angular velocity but different linear velocities, which results in different pressure intensities at the air inlet 22 and the air outlet 23, and further forms a pressure difference between the two ends of the cooling air duct 2. The air can enter the cooling air duct 2 from the end with the higher pressure intensity, i.e. the air inlet 22, and exit from the end with the lower pressure intensity, i.e. the air outlet 23, to realize the circulation of the air inside the rotor body 11, and further realize the heat exchange between the air and the rotor body 11, and improve the heat dissipation capacity of the motor. In addition, the cooling air duct 2 is arranged to extend along the axial direction of the rotor body 11, which can further provide the rotor body 11 with the cooling in the radial direction, and improve the heat dissipation effect of the rotor assembly 1, so as to further improve the heat dissipation effect of the motor.

[0027] In the rotor assembly provided in the present disclosure, the cooling air duct 2 can be constructed in any suitable form, which is not specifically limited in the present disclosure. As an exemplary embodiment, referring to FIG. 1, the cooling air duct 2 can include a plurality of sub-flow channels 21 which are in communication with each other. The axes of the plurality of sub-flow channels 21 can be parallel to each other, and the projection of any two adjacent sub-flow channels 21 in the axial direction of the rotor body 11 can be coincident. That is, the two adjacent sub-flow channels 21 are arranged to be staggered in the radial direction of the rotor body 11 but at least partially coincident, so that any two adjacent sub-flow channels 21 are in communication with each other, and the plurality of sub-flow channels 21 can form a stepped cooling air duct 2. Thus, the heat dissipation of the rotor body 11 can be realized not only in the axial direction but also in the radial direction, and the cooling effect of the rotor body 11 can be improved. Figure 1

[0028] In the present disclosure, the axis of each sub-flow channel 21 is parallel to the axis of the rotor shaft 12, so as to form a stepped cooling air duct 2 which extends along the axial direction of the rotor shaft 12. In other embodiments, the axis of each sub-flow channel 21 can be non-parallel to the axis of the rotor body 11. In this case, the projection of any two adjacent sub-flow channels 21 in the axial direction of the rotor body 11 can be completely coincident, i.e. the axes of the plurality of sub-flow channels 21 are coincident. Thus, the plurality of sub-flow channels 21 can form a straight-line cooling air duct 2, the axis of which is also non-parallel to the axis of the rotor body 11. Thus, the heat dissipation of the rotor body 11 can be realized not only in the axial direction but also in the radial direction, which is not specifically limited in the present disclosure.

[0029] On the basis of the above-described embodiments, referring to FIG. 2, the cooling air duct 2 can include a plurality of sub-flow channels 21 which are in communication with each other. The axes of the plurality of sub-flow channels 21 can be parallel to each other, and the projection of any two adjacent sub-flow channels 21 in the axial direction of the rotor body 11 can be coincident. That is, the two adjacent sub-flow channels 21 are arranged to be staggered in the radial direction of the rotor body 11 but at least partially coincident, so that any two adjacent sub-flow channels 21 are in communication with each other, and the plurality of sub-flow channels 21 can form a stepped cooling air duct 2. Thus, the heat dissipation of the rotor body 11 can be realized not only in the axial direction but also in the radial direction, and the cooling effect of the rotor body 11 can be improved. Figure 1 ​As shown in FIG. 1, the rotor body 11 of the cooling air duct 2 can include a plurality of rotor cores 113, each of which can be provided with a branch channel 21, and the plurality of rotor cores 113 can be stacked along the axial direction of the rotor body 11 to form the cooling air duct 2. In this way, the processing of the cooling air duct 2 can be facilitated, for example, the branch channels 21 can be manufactured on each rotor core 113 by a stamping process, and the plurality of rotor cores 113 can be sequentially stacked so that the plurality of branch channels 21 are combined into the cooling air duct 2.

[0030] In the rotor assembly provided in the present disclosure, as an exemplary embodiment, referring to Figure 1 As shown in FIG. 1, the rotor assembly 1 further includes a rotating shaft 12, the rotor body 11 is sleeved on the outside of the rotating shaft 12, the air inlet 22 can be arranged close to the rotating shaft 12, and the air outlet 23 can be arranged away from the rotating shaft 12. In this way, the rotor body 11 can be more effectively cooled by the cooling air duct 2. Specifically, since the rotating shaft 12 is arranged at the center of the rotor assembly 1, the temperature at the center of the rotor assembly 1 is generally higher than that at the edge, and the temperature of the air at the air inlet 22 is generally lower than that at the air outlet 23. Therefore, the air inlet 22 arranged close to the rotating shaft 12 can facilitate the air to carry away more heat, thereby achieving more effective cooling of the rotor body 11.

[0031] In the rotor assembly provided in the present disclosure, as an exemplary embodiment, referring to Figure 1 and Figure 3 As shown in FIG. 1, the rotor assembly 1 further includes two end plates 13 arranged at both ends of the rotor body 11, each of which can be provided with a first opening 131 and a second opening 132, the air inlet 22 can be in communication with the first opening 131 of one of the two end plates 13, and the air outlet 23 can be in communication with the second opening 132 of the other of the two end plates 13. In this way, during actual installation, the two end plates 13 can be installed at the first end 111 or the second end 112 of the rotor body 11, and the first opening 131 and the second opening 132 of each end plate 13 can be correspondingly arranged to correspond to the air inlet 22 and the air outlet 23, thereby facilitating the installation of the end plate 13. Specifically, during actual installation, since the first end 111 and the second end 112 of the rotor body 11 are respectively provided with one of the air inlet 22 and the air outlet 23, and each end plate 13 is provided with the first opening 131 and the second opening 132, the first opening 131 on the end plate 13 arranged at the first end 111 corresponds to and communicates with the air inlet 22, and the second opening 132 is blocked by the rotor body 11. Correspondingly, the second opening 132 on the end plate 13 arranged at the second end 112 corresponds to and communicates with the air outlet 23, and the first opening 131 is blocked by the rotor body 11. In this way, the two end plates 13 can have the same structure, thereby not only facilitating the installation of the end plate 13, but also facilitating the production and manufacturing of the end plate 13.

[0032] On the basis of the above-mentioned embodiments, as an exemplary embodiment, with reference to Figure 4 shown in FIG. 1, the first opening 131 can be configured as a through hole arranged on the end plate 13, and the second opening 132 can be configured as an aperture located at the edge of the end plate 13. In this way, air can be introduced into the cooling air duct 2 from the first opening 131 through the air inlet 22 and discharged from the second opening 132 through the air outlet 23, wherein the configuration of the second opening 132 as an aperture enables the air to move away from the end plate 13 in the radial direction of the end plate 13 when it is discharged from the second opening 132, i.e., to flow towards the casing 4 of the motor, so as to facilitate the air to contact and exchange heat with the water cooling channels 41 arranged on the casing 4, thereby achieving cooling of the air and ultimately cooling of the rotor body 11.

[0033] In the rotor assembly provided in the present disclosure, as an exemplary embodiment, with reference to Figure 2 shown in FIG. 1, the cooling air duct 2 can include a first air duct 24 and a second air duct 25, wherein the first air duct 24 extends obliquely from the first end 111 towards the second end 112, and the second air duct 25 extends obliquely from the second end 112 towards the first end 111. That is, the first air duct 24 and the second air duct 25 extend oppositely from the two ends of the rotor body 11, respectively, thereby achieving uniform cooling of the rotor body 11.

[0034] On the basis of the above-mentioned embodiments, as an exemplary embodiment, with reference to Figure 2 and Figure 3 shown in FIG. 1, a plurality of cooling air ducts 2 can be arranged at intervals along the circumference of the rotor body 11, and the first air duct 24 and the second air duct 25 can be arranged alternately. In this way, uniform cooling of the rotor body 11 can be further achieved, and at the same time, interference between the first air duct 24 and the second air duct 25 can be avoided, thereby affecting the structural strength of the rotor body 11.

[0035] On the basis of the above-mentioned technical solutions, with reference to Figure 2As shown in the above, the present disclosure also provides an electric machine, comprising a casing 4, a stator assembly 3 and the above-mentioned rotor assembly 1, the stator assembly 3 is fixed with the casing 4, the rotor assembly 1 is arranged in the inside of the stator assembly 3, the casing 4 is provided with a water cooling channel 41, the cooling air duct 2 has an air outlet 23 and an air inlet 22, the air outlet 23 can be arranged close to the water cooling channel 41, and the air inlet 22 can be arranged away from the water cooling channel 41. That is, the cooling air duct 2 can extend from the position of the first end 111 of the rotor body 11 away from the water cooling channel 41 to the position of the second end 112 of the rotor body 11 close to the water cooling channel 41, thereby forming an inclined cooling air duct 2 to achieve cooling of the rotor body 11. Wherein, the air outlet 23 is arranged close to the water cooling channel 41, which can facilitate the air to reduce the heat carried in the air by heat exchange with the casing 4 after sufficient heat exchange with the rotor body 11, and facilitate the air to continue to circulate and exchange heat with the rotor body 11.

[0036] In the electric machine provided by the present disclosure, as an exemplary embodiment, reference is made to Figure 2 As shown in the above, the stator assembly 3 comprises a stator winding 31, the stator winding 31 is sleeved outside the rotor assembly 1, the stator winding 31 has a gap, and the cooling air duct 2 can be in communication with the gap. In this way, the air can enter the cooling air duct 2 through the gap, or the air flowing out of the cooling air duct 2 can flow into the stator winding 31 outside through the gap to achieve thorough cooling of the electric machine, wherein the gap can be matched with the notch arranged on the short plate to tend to flow along the radial direction of the rotor body 11 when the air passes through the air outlet 23, so as to contact the casing 4 through the gap to achieve effective cooling of the air.

[0037] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0038] In addition, it should be noted that each specific technical feature described in the above-described specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0039] In addition, various different embodiments of the present disclosure can also be combined in any manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A rotor assembly, characterized in that, The device includes a rotor body, on which a cooling air duct is provided. The rotor body has a first end and a second end opposite each other in the axial direction. The cooling air duct extends obliquely from the first end toward the second end. One of the first end and the second end is provided with an air inlet and the other is provided with an air outlet.

2. The rotor assembly according to claim 1, characterized in that, The cooling air duct includes multiple interconnected branch channels with parallel axes. The projections of any two adjacent branch channels on the axial direction of the rotor body coincide.

3. The rotor assembly according to claim 2, characterized in that, The rotor body includes multiple rotor cores, each of which is provided with the flow channel. The multiple rotor cores are stacked along the axial direction of the rotor body to form the cooling air duct.

4. The rotor assembly according to any one of claims 1-3, characterized in that, It includes a rotating shaft, the rotor body is sleeved on the outside of the rotating shaft, the air inlet is located close to the rotating shaft, and the air outlet is located away from the rotating shaft.

5. The rotor assembly according to claim 4, characterized in that, It includes two end plates disposed at both ends of the rotor body. Each end plate has a first opening and a second opening. The air inlet is connected to the first opening of one of the two end plates, and the air outlet is connected to the second opening of the other of the two end plates.

6. The rotor assembly according to claim 5, characterized in that, The first opening is a through hole provided on the end plate, and the second opening is a notch located at the edge of the end plate.

7. The rotor assembly according to claim 1, characterized in that, The cooling air duct includes a first air duct and a second air duct, wherein the first air duct extends obliquely from the first end toward the second end, and the second air duct extends obliquely from the second end toward the first end.

8. The rotor assembly according to claim 7, characterized in that, The number of cooling air ducts is multiple, and the multiple cooling air ducts are arranged at intervals along the circumference of the rotor body, with the first air duct and the second air duct being arranged alternately.

9. An electric motor, characterized in that, The device includes a housing, a stator assembly, and a rotor assembly according to any one of claims 1-8, wherein the stator assembly is fixed to the housing, the rotor assembly passes through the interior of the stator assembly, the housing is provided with a water-cooling channel, and the cooling air duct has an air outlet and an air inlet, wherein the air outlet is located close to the water-cooling channel, and the air inlet is located away from the water-cooling channel.

10. The motor according to claim 9, characterized in that, The stator assembly includes a stator winding, which is sleeved on the outside of the rotor assembly. The stator winding has a gap, and the cooling air duct communicates with the gap.

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