Motor

Abstract

The utility model discloses a motor, comprising a hollow shaft, the inside of which is used for liquid feeding; the multi-stack rotor laminations are arranged around the hollow shaft, and the multi-stack rotor laminations comprise a plurality of first cooling channels; the first end cover is provided with a plurality of groups of first flow channels and second flow channels which are communicated with one another, one end of each first flow channel is communicated with the hollow shaft, the first flow channels correspond to a part of the first cooling channels in the first direction, and one end of each second flow channel penetrates through the edge of the first end cover; the second end cover is provided with a plurality of first rotating parts, and the first rotating parts correspond to the first cooling channels in a one-to-one mode in the first direction; and a cooling medium in the hollow shaft can flow into the first flow channel, sequentially flows through one part of the first cooling channel, the first rotary part, the other part of the first cooling channel and the second flow channel, and flows out of the first end cover through the second flow channel. The motor provided by the utility model can provide a cooling path with a larger heat exchange area, thereby effectively cooling the rotor.

Description

Technical Field

[0001] The utility model relates to the technical field of motor cooling, in particular to a motor. Background Art

[0002] The motor is a core component in the power system. It generates a lot of heat during operation due to energy loss. At present, air cooling, liquid cooling, hybrid cooling and other methods are often used to dissipate heat from the stator winding of the motor. However, in the motor cooling scheme, only the stator of the motor is cooled, but not the rotor. Therefore, a lot of heat is generated inside the rotor, and this heat cannot be dissipated quickly. When the rotor temperature rises to a certain level, it is likely to cause the permanent magnet in the rotor to demagnetize, causing permanent damage to the motor. Utility Model Content

[0003] The purpose of the utility model is to solve the technical problem of how to achieve a better convective heat exchange effect on a motor rotor. The utility model provides a motor, which can provide a cooling path with a large heat exchange area, so as to effectively cool the rotor.

[0004] In order to solve the above technical problems, the embodiment of the utility model discloses a motor, comprising:

[0005] A hollow shaft, inside of which a cooling medium flows;

[0006] A plurality of rotor laminations are arranged around the hollow shaft, the plurality of rotor laminations comprising a plurality of first cooling channels extending in a first direction;

[0007] A first end cover is provided with a plurality of first flow channels and second flow channels connected at an angle, one end of the first flow channel is connected to the hollow shaft, the other end of the first flow channel terminates near the edge of the first end cover, one end of the second flow channel passes through the edge of the first end cover, and the other end of the second flow channel is connected to the first flow channel;

[0008] a second end cover, wherein the second end cover and the first end cover are respectively located on both sides of the axial direction of the multiple rotor laminations; the second end cover is provided with a plurality of first rotating parts, and along the first direction, the plurality of first rotating parts correspond one by one to the plurality of groups of first flow channels and second flow channels connected at an angle;

[0009] Among them, along the first direction, the corresponding first rotating part is connected to the first flow channel and the second flow channel connected at an angle via the multiple first cooling channels, so that the cooling medium flowing inside the hollow shaft can flow into the first flow channel, and flow through a part of the first cooling channels in the multiple first cooling channels, the first rotating part, another part of the first cooling channels in the multiple first cooling channels, the second flow channel in sequence, and flow out of the first end cover from the second flow channel.

[0010] By adopting the above technical scheme, a plurality of first cooling channels are provided in the rotor (multi-stack rotor laminations) in the motor of the embodiment of the present application. On this basis, a plurality of groups of interconnected first flow channels and second flow channels are provided on the side of the first end cover facing the rotor laminations. At the same time, a plurality of first rotating parts are provided on the side of the second end cover facing the first end cover. Each group of first flow channels and second flow channels can correspond to the corresponding plurality of first cooling channels and first rotating parts.

[0011] When the motor is running, the cooling medium in the hollow shaft can flow into the first flow channel (first end cover). During the flow in the first flow channel, the cooling medium can flow into a portion of the first cooling channel corresponding to the first flow channel, and flow to the first rotating part (second end cover) to achieve the first cooling of the multi-stack rotor laminations. Then, the cooling medium in the first rotating part can flow through another portion of the first cooling channel in the reverse direction again, and flow back to the second flow channel, thereby achieving the second cooling of the multi-stack rotor laminations, and the cooling medium finally flows out of the first end cover from the second flow channel.

[0012] In the above process, effective cooling of the rotor is first achieved. More importantly, the rotor of the embodiment of the present application can be cooled at least twice in the cooling path. That is to say, the motor of the embodiment of the present application increases the convective heat transfer effect on the rotor and effectively reduces the rotor temperature by designing a cooling path with a large heat exchange area between the first end cover, the rotor, and the second end cover.

[0013] In addition, after the cooling medium finally flows out of the first end cover, it can be thrown to the stator winding under the action of the centrifugal force of the motor, thereby further cooling the stator.

[0014] According to another specific embodiment of the utility model, the first flow channel includes a first part and a second part intersecting at an angle, the first part intersects with the second flow channel, and a first liquid inlet is provided at one end of the second part, and the first liquid inlet is connected to the hollow shaft via an oil-swinging hole opened on the hollow shaft.

[0015] According to another specific embodiment of the present invention, the first rotating portion is a closed triangular rotating flow channel.

[0016] According to another specific embodiment of the present utility model, the first rotating portion includes a third part, a fourth part and a fifth part that are connected. Along the first direction, the third part corresponds to the first part of the first flow channel, and the fourth part corresponds to the second flow channel.

[0017] According to another specific embodiment of the utility model, the multi-stack rotor laminations further include a plurality of second cooling channels extending along the first direction, the first end cover further includes a plurality of second turning portions, and the second end cover further includes a plurality of groups of third flow channels and fourth flow channels connected at an angle, wherein:

[0018] Along the first direction, the plurality of second turning parts correspond one to one with the plurality of groups of third flow channels and fourth flow channels connected at an angle;

[0019] One end of the third flow channel is connected to the hollow shaft, and the other end of the third flow channel terminates near the edge of the second end cover. One end of the fourth flow channel passes through the edge of the second end cover, and the other end of the fourth flow channel is connected to the third flow channel.

[0020] Among them, along the first direction, the corresponding second rotating part is connected to the third flow channel and the fourth flow channel connected at an angle via the multiple second cooling channels, so that the cooling medium flowing inside the hollow shaft can flow into the third flow channel, and flow through a part of the second cooling channels in the multiple second cooling channels, the second rotating part, another part of the second cooling channels in the multiple second cooling channels, the fourth flow channel in sequence, and flow out of the second end cover from the fourth flow channel.

[0021] By adopting the above technical solution, the motor of the embodiment of the present application can also be provided with a plurality of second rotating parts on the first end cover, and at the same time, a plurality of third flow channels and fourth flow channels are provided on the second end cover, and the third flow channels and the fourth flow channels can correspond to the corresponding plurality of second cooling channels and second rotating parts.

[0022] When the motor is running, the cooling as described above is performed between the first flow channel, the second flow channel and the first rotating part. At the same time, the cooling medium in the hollow shaft can flow into the third flow channel (the second end cover). During the flow of the third flow channel, the cooling medium can flow into a portion of the second cooling channel corresponding to the third flow channel and flow to the second rotating part (the first end cover) to achieve the first cooling of the multi-stack rotor laminations. Then, the cooling medium in the second rotating part can flow through another portion of the second cooling channel in the reverse direction again and flow back to the fourth flow channel, thereby achieving the second cooling of the multi-stack rotor laminations. The cooling medium finally flows out of the second end cover from the fourth flow channel.

[0023] Therefore, in this embodiment, another cooling path is added, thereby increasing the heat exchange area and further improving the cooling efficiency of the motor. Accordingly, when the cooling medium finally flows out of the second end cover, it can be thrown to the stator winding under the action of the centrifugal force of the motor, thereby further cooling the stator.

[0024] According to another specific embodiment of the utility model, each of the rotor laminations is provided with a first slot group, the first slot group includes a plurality of first slots, each of the first slots penetrates the rotor lamination, a magnetic steel is provided in the first slot, a first air gap is formed between the magnetic steel and the inner wall of the first slot, and along the first direction, the corresponding first air gaps of the multiple rotor laminations correspond one by one and are connected to form the first cooling channel extending along the first direction.

[0025] By adopting the above technical solution, in the embodiment of the present application, the magnetic steel and the inner wall of the first notch can form a first air gap, and a plurality of corresponding first air gaps correspond and communicate along the first direction, thereby forming the above-mentioned plurality of first cooling channels. In the actual cooling process, the cooling medium in the hollow shaft can flow into the first cooling channels formed by these corresponding first air gaps, and perform convection heat exchange with the rotor, thereby reducing the temperature of the magnetic steel and the risk of motor demagnetization.

[0026] According to another specific embodiment of the present invention, the width of the first portion and / or the second flow channel matches the width of the corresponding first notch to cover the first air gap.

[0027] According to another specific embodiment of the present invention, a width-narrowing portion is provided at a position of the first portion and / or the second flow channel corresponding to the magnetic steel to abut against the magnetic steel.

[0028] According to another specific embodiment of the utility model, the first end cover is provided with four groups of first flow channels and second flow channels intersecting at an angle, and the second end cover is provided with four first rotating parts.

[0029] According to another specific embodiment of the present invention, the first flow channel and the second flow channel intersect to form a Y-shaped flow channel.

[0030] The embodiment of the utility model further discloses a motor, which is characterized by comprising:

[0031] A hollow shaft, inside of which a cooling medium flows;

[0032] A plurality of rotor laminations are arranged around the hollow shaft;

[0033] A first end cover and a second end cover are respectively located on two axial sides of the multi-stack rotor laminations;

[0034] The first end cover is provided with a first flow channel that does not penetrate the edge of the first end cover and a second flow channel that penetrates the edge of the first end cover, and the second end cover is provided with a first turning portion that does not penetrate the edge of the second end cover, so that the cooling medium flowing inside the hollow shaft can flow into the first flow channel on the first end cover, flow through the multiple rotor stacks and then merge into the second end cover, pass through the first turning portion on the second end cover, and then flow back to the first end cover through the multiple rotor stacks, and then flow out of the motor through the second flow channel on the first end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The three-dimensional diagram of the motor of the utility model is shown Figure 1 .

[0036] Figure 2 An exploded view of multiple rotor laminations in an embodiment of the present invention is shown.

[0037] Figure 3 A front view of a rotor lamination in an embodiment of the present invention is shown.

[0038] Figure 4 The three-dimensional diagram of the motor of the utility model is shown Figure 2 ; Among them, the figure shows the first flow channel, the second flow channel and the first cooling channel of the first end cover, and the multiple rotor laminations are omitted.

[0039] Figure 5 The three-dimensional diagram of the motor of the utility model is shown Figure 3 ; Among them, the figure shows the first rotating portion and the first cooling channel of the second end cover, and the multiple rotor laminations are omitted.

[0040] Figure 6 A front view of a first end cover in an embodiment of the utility model is shown; wherein the figure shows a first flow channel, a second flow channel and a second rotating portion of the first end cover.

[0041] Figure 7 A front view of the second end cover in an embodiment of the utility model is shown; wherein the figure shows the first rotating portion and the third flow channel and the fourth flow channel of the second end cover.

[0042] Figure 8 A three-dimensional schematic diagram of the cooling path in the embodiment of the utility model is shown. DETAILED DESCRIPTION

[0043] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0044] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0045] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0046] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0047] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0048] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0049] See also Figure 1An embodiment of the present application provides a motor 1 capable of cooling a rotor. The motor 1 of the embodiment of the present application includes a hollow shaft 10, a rotor (six-stack rotor laminations 20), a first end cover 30 and a second end cover 40.

[0050] It can be seen that the six-stack rotor laminations 20 are arranged around the hollow shaft 10, and the first end cover 30 is arranged on the left side of the six-stack rotor laminations in the axial direction (i.e. Figure 1 The second end cover 40 is arranged on the right side of the six-stack rotor lamination along the axial direction (i.e. Figure 1 The side indicated by the Z2 direction).

[0051] For example, the first end cover 30 may also be disposed on the right side of the six-stack rotor laminations 20 in the axial direction (i.e. Figure 1 The second end cover 40 is disposed on the left side of the six-stack rotor laminations 20 in the axial direction (i.e., Figure 1 The first end cover 30 of the embodiment of the present application may be the front end cover of the motor 1, and the second end cover 40 may be the rear end cover of the motor 1, or the first end cover 30 may be the rear end cover of the motor 1, and correspondingly, the second end cover 40 may be the front end cover of the motor 1.

[0052] For example, each stack of rotor laminations 20 in the embodiment of the present application is formed by laminating a plurality of thin sheets (i.e., relatively thin silicon steel sheets). Figure 1 Six stacks of rotor laminations 20 are shown as an example, but the embodiment of the present application does not limit the number of stacks of rotor laminations 20. For example, the motor 1 of the embodiment of the present application can also include five stacks, eight stacks, or the like of rotor laminations 20.

[0053] In a possible implementation, the hollow shaft 10 of the embodiment of the present application includes a liquid inlet end 101 and a closed end / liquid outlet end 102, and a drainage port 1011 is provided on the liquid inlet end 101, and the drainage port 1011 is used to introduce a cooling medium into the hollow shaft 10 during actual use. After the cooling medium enters the hollow shaft 10 through the drainage port 1011, the cooling medium can adhere to the inner wall of the hollow shaft 10, and since the motor is dynamically balanced during operation, most of the inner wall of the hollow shaft 10 will be paved with the cooling medium, that is, the cooling medium in the hollow shaft 10 can supply liquid to the first end cover 30 and the second end cover 40 at the same time.

[0054] Exemplarily, a plurality of through holes (i.e., a plurality of oil-spinning holes, not shown in the figure) are opened at positions of corresponding end covers (e.g., the first end cover 30 and the second end cover 40) of the hollow shaft 10, and the oil-spinning holes correspond to and are connected with the first liquid inlet of the second part to be described later, so as to supply liquid to the first end cover 30 and the second end cover 40 when the motor is running.

[0055] The cooling medium in the embodiment of the present application is a liquid with insulating cooling function, such as cooling oil and insulating coolant. The embodiment of the present application does not limit the cooling medium.

[0056] The cooling medium in the hollow shaft 10 of the embodiment of the present application can first flow into the first end cover 30, and the cooling medium after flowing into the first end cover 30 further flows through the six-fold rotor laminations 20, and then continues to flow into the second end cover 40, and the cooling medium in the second end cover 40 can flow back to the first end cover 30 again, and finally flows out of the motor 1 from the first end cover 40. That is, the rotor (i.e., the six-fold rotor laminations 20) of the motor 1 of the embodiment of the present application can flow through the cooling medium, and after the cooling medium enters the motor 1 from the first end cover 30, it flows through the six-fold rotor laminations 20 and enters the second end cover 40, and then flows back to the first end cover 30 from the second end cover 40, and finally flows out of the motor 1 from the first end cover 30, thereby achieving effective cooling of the rotor.

[0057] During the entire cooling process of flowing into the first end cover 30, flowing through the six-fold rotor stack 20, flowing into the second end cover 40, and flowing back to the first end cover 30, the six-fold rotor stack 20 can be cooled at least twice in the cooling path (which will be described in detail later). That is, by designing a cooling path with a larger heat exchange area between the first end cover 30, the rotor, and the second end cover 40, the convective heat transfer effect on the rotor is improved, thereby effectively reducing the rotor temperature.

[0058] See also Figure 1 and Figure 2 Combined with Figure 4 , Figure 2 An exploded view of a portion of the rotor laminations 20 is shown as an example. A plurality of first cooling channels 501 are formed in the six-stack rotor laminations 20 , so that a cooling medium can flow through the six-stack rotor laminations 20 .

[0059] For example, see Figure 3 , Figure 3 A front view of one stack of rotor laminations 20 is shown as an example, and the structures of the other five stacks of rotor laminations 20 are the same.

[0060] Each stack of rotor laminations 20 is provided with four first slot groups 200 and four second slot groups 210. The four first slot groups 200 and the four second slot groups 210 are arranged along the circumferential direction of the rotor laminations 20 (eg Figure 3 However, the embodiment of the present application does not limit the number of the first slot groups 200 and the second slot groups 210, and three, five, or other numbers of the first slot groups 200 and the second slot groups 210 may be respectively set, and the selection is made according to the actual application of the motor (such as the electromagnetic scheme).

[0061] like Figure 3As shown, the first slot group 200 includes two first slots 201, but the embodiment of the present application does not limit the number of first slots 201. For example, one, two, or the like first slots 201 may be provided, depending on the actual application of the motor (eg, electromagnetic scheme).

[0062] Exemplarily, the two first slots 201 in each first slot group 200 are arranged along a first straight line (eg Figure 3 For example, the extension direction of the first straight line may be parallel to the radial direction of the rotor lamination 20 (eg, Figure 3 The Y direction shown in FIG. 1 ), the embodiment of the present application does not limit the extension direction of the first straight line.

[0063] See also Figure 3 Combined with Figure 2 Each first notch 201 can be axially (eg Figure 2 The Z direction shown in FIG. 1 ) penetrates the corresponding rotor lamination 20. At the same time, each first slot 201 is provided with a magnetic steel 220. For ease of understanding, Figure 3 Only a portion of the magnetic steel 220 (ie, the magnetic steel 220 disposed in the first slot 201 ) is exemplarily shown.

[0064] It can be seen that a first air gap 2000 is formed between the inner wall of the first slot 201 and the corresponding magnetic steel 220. The first air gap 2000 is axially (eg Figure 2 The first air gap 2000 is used for the cooling medium to flow in (described in detail later).

[0065] See also Figures 2 to 4 , exemplarily, along a first direction (such as Figure 2 The corresponding first air gaps 2000 of the six rotor laminations 20 correspond to each other and are connected to form a plurality of first cooling channels 501 extending along the first direction. Figure 4 Four first cooling channels 501 are exemplarily shown, and each first cooling channel 501 includes six first air gaps 2000 corresponding to each other along the first direction. The embodiment of the present application does not limit the number of the first cooling channels 501.

[0066] For example, the first direction and the axial direction of the motor 1 (eg Figure 2 and Figure 4 For example, the first direction may also intersect with the axial direction of the motor 1. The embodiment of the present application does not limit the first direction. As long as the first cooling channel 201 can penetrate the six-stack rotor laminations 20 and the cooling medium flows between the first end cover 30 and the second end cover 40 through the first cooling channel 201, it belongs to the protection scope of the embodiment of the present application.

[0067] According to the above description, each stack of rotor laminations 20 is provided with four first slot groups 200, and each first slot group 200 includes two first slots 201. Figure 3 , illustratively, each first slot group 200 of the embodiment of the present application includes four first air gaps 2000 (each first slot 201 includes two first air gaps 2000).

[0068] therefore, Figure 3 The first slot group 200 shown in the example includes sixteen first air gaps 2000, further combined with Figure 2 , the corresponding first air gaps 2000 of the six-stack rotor laminations 20 are connected along the first direction. Therefore, the embodiment of the present application exemplarily includes sixteen first cooling channels 501. It should be noted that, for the convenience of description and display, Figure 4 Only four first cooling channels 501 are exemplarily shown in the figure. However, the number of the first cooling channels 501 is not limited in the embodiment of the present application.

[0069] See also Figure 3 The second slot group 210 includes two second slots 211. The embodiment of the present application does not limit the number of the second slots 211. For example, one, two, or the like second slots 211 may be provided.

[0070] Exemplarily, the two second slots 211 in each second slot group 210 are arranged along a second straight line (eg Figure 3 For example, the extension direction of the second straight line may be parallel to the radial direction of the rotor lamination 20 (eg, Figure 3 For example, the extension direction of the second straight line may also intersect with the radial direction of the rotor laminations 20. The embodiment of the present application does not limit the extension direction of the second straight line.

[0071] See also Figure 3 Combined with Figure 2 Each second notch 211 can be axially (eg Figure 2 The Z direction shown in FIG. 2 ) penetrates the corresponding rotor lamination 20, and at the same time, a magnetic steel 220 is provided in each second slot 211, such as Figure 2 It should be understood that in order to better illustrate the structure of the first notch 201 and the second notch 211, Figure 3 In the figure, only the magnetic steel 220 located in some of the slots is exemplarily shown, for example, only the magnetic steel 220 arranged in the first slot 201 is shown.

[0072] See also Figure 3 Combined with Figure 2 Each second notch 201 can be axially (eg Figure 2The Z direction shown in FIG. 1 ) penetrates the corresponding rotor lamination 20 , and a magnetic steel 220 is also provided in each second slot 201 .

[0073] Although Figure 3 The magnetic steel of the second slot 211 is not shown in the figure, but it can be understood by referring to the first slot 201 mentioned above that a second air gap 2001 is formed between the inner wall of the second slot 211 and the magnetic steel, and the second air gap 2001 is axially (such as Figure 2 The second air gap 2001 is used for the cooling medium to flow into.

[0074] See also Figures 2 to 4 , exemplarily, along a first direction (such as Figure 2 The corresponding second air gaps 2001 of the six rotor laminations 20 correspond to each other and are connected to form a plurality of second cooling channels 502 extending along the first direction. Figure 4 Four second cooling channels 502 are shown as an example, and each second cooling channel 502 includes six second air gaps 2001 corresponding to each other along the first direction (eg Figure 2 As shown), the embodiment of the present application does not limit the number of the second cooling channels 502.

[0075] According to the above description, each stack of rotor laminations 20 is provided with four second slot groups 210, and each second slot group 210 includes two second slots 211. Figure 3 , illustratively, each second slot group 210 of the embodiment of the present application includes four second air gaps 2001 (each second slot 211 includes two second air gaps 2001).

[0076] therefore, Figure 3 The second slot group 210 shown in the example includes sixteen second air gaps 2001, further combined with Figure 2 The corresponding second air gaps 2001 of the six rotor laminations 20 are connected along the first direction to form a second cooling channel 502 . Therefore, the embodiment of the present application exemplarily includes sixteen second cooling channels 502 .

[0077] On the basis that the six-stack rotor laminations 20 have cooling channels (ie, the first cooling channels 501 or the second cooling channels 502 ), the embodiment of the present application further provides a first end cover 30 and a second end cover 40 .

[0078] See also Figure 6 Combined with Figure 1 , Figure 6The front view of the first end cover 30 is shown as an example. The first end cover 30 is provided with a plurality of groups of first flow channels 301 and second flow channels 302 intersecting at an angle. The first flow channels 301 and the second flow channels 302 are opened on one side of the first end cover 30 facing the rotor lamination 20 along the first direction (e.g. Figure 1 One end of the first flow channel 301 (the side indicated by the Z2 direction) is connected to the above-mentioned hollow shaft 10 (for example, via the oil-slinging hole mentioned above), and the other end terminates near the edge of the first end cover 30; one end of the second flow channel 302 passes through the edge of the first end cover 30, and the other end is connected to the first flow channel 301.

[0079] In a possible embodiment, the first flow channel 301 includes a first part 3011 and a second part 3012. It can be seen that the first part 3011 intersects with the second flow channel 302 at an angle (and the first part 3011 and the second flow channel 302 are connected at the intersection), and a first liquid inlet 3013 is provided at one end of the second part 3012, and the first liquid inlet 3013 is used to be connected to the above-mentioned hollow shaft 10; the other end of the second part 3012 intersects at the above-mentioned intersection of the first part 3011 and the second flow channel 302 (and the second part 3012, the first part 3011, and the second flow channel 302 are connected at the intersection).

[0080] exist Figure 6 In the example shown, the diameter of the first liquid inlet 3013 or the width of the second part 3012 matches the diameter of the oil-slinging hole on the hollow shaft 10, for example, is substantially equal to or slightly larger than the diameter of the oil-slinging hole, so that the cooling medium flows from the oil-slinging hole through the first liquid inlet 3013 into the second part 3012.

[0081] In one possible embodiment, the width of the first portion 3011 and the second flow channel 302 matches the width of the first slot 201 of the first slot group 200 or the second slot 211 of the second slot group 210, for example, covers the first slot 201 or the second slot 211 so as to cover the first air gap 2000 or the second air gap 2001, so that the cooling medium flows in the first portion 3011 and the second flow channel 302 and can flow through the first air gap 2000 or the second air gap 2001.

[0082] For example, the first portion 3011 and the second flow channel 302 are at positions corresponding to the magnetic steel 220 (for example, at Figure 6 In the example shown, the first portion 3011 and the middle portion of the second flow channel 302 are provided with a width narrowing portion 300, which abuts against the magnetic steel 220 to prevent the magnetic steel 220 from completely or partially escaping from the first slot 201 or the second slot 211 and entering the first portion 3011 or the second flow channel 302. Figure 6What is shown is only one possible implementation mode. The width narrowing portion 300 may be provided only at the corresponding position of the first portion 3011, or the width narrowing portion 300 may be provided only at the corresponding position of the second flow channel 302. The embodiment of the present application does not limit this.

[0083] In a possible implementation, the second flow channel 302 is provided with a first liquid outlet 3022 , and the cooling medium that enters the first flow channel 301 through the first liquid inlet 3013 and flows into the second flow channel 302 can flow out of the first end cover 30 through the first liquid outlet 3022 .

[0084] Exemplarily, the first flow channel 301 and the second flow channel 302 can intersect as follows: Figure 6 As shown in the figure, the four irregular Y-shaped flow channels are as follows; as can be seen from the foregoing, the irregularity of the Y-shaped flow channel is that one end of the second flow channel 302 penetrates the edge of the first end cover 30 to form the first liquid outlet 3022, so the length of the second flow channel 302 is longer than the first portion 3011 of the first flow channel 301. The embodiment of the present application does not limit the number of Y-shaped flow channels formed by the first flow channel 301 and the second flow channel 302, for example, three, four, five, or other groups of Y-shaped flow channels may be provided.

[0085] In a possible implementation, Figure 6 As shown, along the circumference of the first end cover 30 (such as Figure 6 W2 direction shown in FIG), Figure 6 The four groups of first flow channels 301 and second flow channels 302 exemplarily shown in FIG. 3 are arranged at intervals.

[0086] See also Figure 4 Combined with Figure 3 and Figure 6 , along the first direction (such as Figure 4 E direction shown in FIG), the first flow channel 301 corresponds to a portion of the first cooling channels 501 of the plurality of first cooling channels 501, that is, as Figure 4 As shown, the first portion 3011 of the first flow channel 301 can correspond to two of the four first cooling channels 501 along the first direction (that is, the first portion 3011 can correspond to the two first cooling channels 501 formed by the corresponding first air gaps 2000 in the six-stack rotor laminations), and the two first cooling channels 501 are respectively located at the two ends of the first portion 3011, that is, the intersection of the first portion 3011 and the second flow channel 302 and the end position of the first portion 3011 near the edge of the first end cover 30. Further, the two first cooling channels 501 are as shown Figure 3 The two first air gaps 2000 shown in the middle dotted line portion M correspond to cooling channels.

[0087] The second flow channel 302 can correspond to the other two first cooling channels 501 of the four first cooling channels along the first direction, that is, the second flow channel 302 can correspond to the other two first cooling channels 501 formed by the corresponding first air gaps 2000 in the above six rotor laminations.

[0088] See also Figure 6 In a possible implementation, the first end cover 30 is further provided with a plurality of second rotating parts 303, and each second rotating part 303 of the first end cover 30 corresponds to each group of third flow channels and fourth flow channels (as described later) provided in the second end cover 40 along the first direction.

[0089] It should be noted that the second rotating portion 303 of the first end cover 30 and the first rotating portion 401 of the second end cover 40 described later have the same structure and arrangement. The second rotating portion 303 is not described in detail in the present embodiment of the application, and the second rotating portion 303 can refer to the description of the first rotating portion 401 of the second end cover 40 described later.

[0090] It is further noted that, see Figures 4 to 7 , the present application includes but is not limited to three embodiments. In the first embodiment, the first end cover 30 is only provided with the first flow channel 301 and the second flow channel 302, and the second end cover 40 is only provided with the corresponding first rotating part 401. In the second embodiment, the first end cover 30 is only provided with the second rotating part 303, and the second end cover 40 is only provided with the corresponding third flow channel 402 and the fourth flow channel 403. The first embodiment and the second embodiment can be selected according to the actual application of the motor 1.

[0091] In the third embodiment, the first end cover 30 is provided with the first flow channel 301, the second flow channel 302 and the second turning part 303 at the same time, and the Y-shaped flow channel formed by the first flow channel 301 and the second flow channel 302 and the second turning part 303 are spaced and alternately arranged along the circumference of the first end cover 30; at the same time, the second end cover 40 is provided with the first turning part 401 and the third flow channel 402 and the fourth flow channel 403, and the Y-shaped flow channel formed by the third flow channel 402 and the fourth flow channel 403 and the first turning part 401 are spaced and alternately arranged along the circumference of the second end cover 40. The embodiment of the present application is described by taking the third embodiment as an example.

[0092] See also Figure 7 , Figure 7 The front view of the second end cover 40 is exemplarily shown. The second end cover 40 is provided with four first rotating parts, but the embodiment of the application does not limit the number of the first rotating parts 401, for example, three, four, five, etc. first rotating parts 401 can be provided.

[0093] Exemplarily, along the circumference of the second end cover 40 (eg Figure 7W3 direction shown in Figure 7 The four first rotating parts 401 exemplarily shown in the figure are arranged at intervals.

[0094] See also Figure 7 Combined with Figure 3 and Figure 5 , illustratively, the first rotating portion 401 corresponds to the corresponding first air gap 2000 in the six-stack rotor laminations. That is, along the first direction (such as Figure 5 E direction shown in FIG), each first turning portion 401 in the second end cover 40 corresponds to four first cooling channels 501 one by one.

[0095] In a possible implementation manner, the first rotating portion 401 is a closed triangular rotating flow channel. Exemplarily, the first rotating portion 401 includes a third portion 4011, a fourth portion 4012 and a fifth portion 4013. Figure 7 As shown, the fifth portion 4013 is arc-shaped, for example, an arc-shaped arc that matches the arc-shaped edge of the second end cover 40, and one end of the third portion 4011 (i.e. Figure 7 The end indicated by the direction b in the figure) is connected to one end of the fifth part 4013, and one end of the fourth part 4012 (i.e. Figure 7 The other end of the third part 4011 (i.e. Figure 7 The end indicated by the direction a in the figure) and the other end of the fourth part 4012 (i.e. Figure 7 The two ends (in the direction d) are connected to form the above-mentioned triangular rotating flow channel.

[0096] exist Figure 7 In the example shown, the width of the third part 4011 and the fourth part 4012 matches the width of the first slot 201 of the first slot group 200 or the second slot 211 of the second slot group 210, for example, covers the first slot 201 or the second slot 211, so that the cooling medium flows in the third part 4011 and the fourth part 4012 and can flow through the first air gap 2000 or the second air gap 2001.

[0097] For example, the third part 4011 and the fourth part 4012 correspond to the magnetic steel 220 (for example, at Figure 7 In the example shown, the width narrowing portion 400 is provided in the middle of the third portion 4011 and the fourth portion 4012, and the width narrowing portion 400 abuts against the magnetic steel 220 to prevent the magnetic steel 220 from completely or partially escaping from the first slot 201 or the second slot 211 and entering the third portion 4011 and the fourth portion 4012. Figure 7What is shown is only one possible implementation mode. The width narrowing portion 400 may be provided only at the corresponding position of the third portion 4011, or the width narrowing portion 400 may be provided only at the corresponding position of the fourth portion 4012. This embodiment of the present application does not limit this.

[0098] See also Figure 7 and Figure 8 , Figure 8 The schematic diagram of the cooling path (described in detail later) of the embodiment of the present application is exemplarily shown, in order to facilitate the simulation of the flow of the cooling medium. Figure 8 The cooling paths shown in FIG. 5 are in solid form (fluid domain).

[0099] It can be seen that in the first rotating portion 401, along the first direction (such as Figure 8 E direction shown in FIG), one end of the third part 4011 (ie Figure 7 The end indicated by the direction a in the figure corresponds to one end of the first part 3011 of the first flow channel 301, and the first cooling channel 501 is included between the two ends.

[0100] Along the first direction, one end of the fourth portion 4012 (i.e. Figure 7 The end indicated by the direction d in the figure corresponds to the end of the second flow channel 302 close to the first liquid outlet 3022, and a first cooling channel 501 is also included between the two ends.

[0101] The other end of the third portion 4011 (i.e. Figure 7 The end indicated by the direction b in the figure corresponds to the other end of the first part 3011 of the first flow channel 301 (that is, the end where the first part 3011 intersects with the second flow channel 302), and a first cooling channel 501 is included between the two ends.

[0102] The other end of the fourth portion 4012 (i.e. Figure 7 The end indicated by the direction c in the figure corresponds to the end of the second flow channel 302 away from the first liquid outlet 3022, and a first cooling channel 501 is included between the two ends.

[0103] See also Figure 8 Combined with Figure 6 and Figure 7 It should be noted that, along the first direction, each group of intersecting first flow channels 301 and second flow channels 302 (i.e., a Y-shaped flow channel formed by the intersection of each group of first flow channels 301 and second flow channels 302) corresponds to the same first turning portion 401 in the second end cover 40.

[0104] In one possible implementation, see Figure 7The second end cover 40 is also provided with a plurality of groups of third flow channels 402 and fourth flow channels 403 intersecting at an angle, one end of the third flow channel 402 is connected to the hollow shaft, and the third flow channel 402 and the second cooling channel 502 (such as Figure 5 One end of the fourth flow channel 403 passes through the edge of the second end cover 40. Exemplarily, the third flow channel 402 and the fourth flow channel 403 also intersect to form a Y-shaped flow channel.

[0105] As can be seen from the foregoing, each set of Y-shaped flow channels formed by the third flow channel 402 and the fourth flow channel 403 needs to correspond to the second rotating portion (the first end cover 30 ).

[0106] It should be noted that the third flow channel 402 of the second end cover 40 is the same as the first flow channel 301 of the first end cover 30 in the previous text, and the fourth flow channel 403 of the second end cover 40 is the same as the second flow channel 302 of the first end cover 30 in the previous text. Therefore, the structure and setting method of the third flow channel 402 and the fourth flow channel 403 are not described in detail in the embodiment of the present application. The third flow channel 402 and the fourth flow channel 403 can refer to the previous description of the first flow channel 301 and the second flow channel 302 1 in the first end cover 30.

[0107] In addition, the above-mentioned second cooling channel 502 is a cooling channel corresponding to each group of Y-shaped flow channels formed by the third flow channel 402 and the fourth flow channel 403 and the second rotating part 303. The second cooling channel 502 is also a cooling channel formed by multiple corresponding second air gaps in the six-fold rotor laminations along the first direction; and the above-mentioned first cooling channel 501 is a cooling channel corresponding to each group of Y-shaped flow channels formed by the first flow channel 301 and the second flow channel 302 and the first rotating part 401.

[0108] Continue reading Figure 8 Combined with Figure 3 , Figure 6 and Figure 7 In the embodiment of the present application, at least one cooling path is included, namely, the cooling path between the first flow channel 301 and the second flow channel 302 of the first end cover 30 and the first turning portion 401 of the second end cover 40. The embodiment of the present application is described by taking this cooling path as an example. However, it should be noted that, according to the foregoing, the embodiment of the present application may also include another cooling path, namely, the cooling path between the third flow channel 402 and the fourth flow channel 403 of the second end cover 40 and the second turning portion 303 of the first end cover 30. Since the other cooling path is similar to the aforementioned at least one cooling path, the embodiment of the present application does not repeat the other cooling path.

[0109] When the motor is running, the cooling medium flowing on the inner wall of the hollow shaft 10 is thrown out from the oil throwing hole set on the hollow shaft 10, and flows along the first liquid inlet 3013. Figure 8 Enter the second portion 3012 (first end cover 30) of the first flow channel 301 in the direction indicated by the arrow in the middle path R1; then Figure 8 The direction indicated by the arrow of the middle path R2 is merged into the first part 3011 of the first flow channel 301. It should be understood that, especially when the motor rotor rotates in a specific direction, all or most of the cooling medium entering the second part 3012 will flow along Figure 8 The direction indicated by the arrow of the middle path R2 flows into the first part 3011, and only a small part or even no cooling medium flows into the second flow channel 302. The motor rotor rotates in a specific direction when it is in Figure 8 At the viewing angle shown (i.e., the viewing angle from the closed end / liquid outlet end 102 to the liquid inlet end 101), the hollow shaft 10 drives the rotor to rotate in a clockwise direction.

[0110] In the above process, the cooling medium will first flow into the first air gap 2000 (such as Figure 3 The two first air gaps 2000 shown by the dashed line K correspond to the first cooling channels 501, that is, along Figure 8 In the direction indicated by the arrow of the path R3 shown in FIG. 1 , the cooling medium flows through the two first cooling channels 501 and then flows into the first rotating portion 401 (the second end cover 40, specifically, flows into the intersection of the third portion 4011 and the fourth portion 4012). Figure 3 The first cooling channel 501 corresponding to the first air gap 2000 flows along the first cooling channel 501 (as shown in the dashed line N in the middle). Figure 8 The liquid flows in the direction indicated by the arrow in the path R4 shown in the figure, until it flows into the third portion 4011 of the first turning portion 401.

[0111] Afterwards, the cooling medium flowing into the third part 4011 can Figure 8 The cooling medium flows to the intersection of the fifth part 4013 and the fourth part 4012 in the direction indicated by the arrow of the path R5 shown in FIG. 4 . At this time, the cooling medium flows into the last first air gap 2000 (such as Figure 3 The first air gap 2000 corresponds to the last first cooling channel 501, and flows through the first cooling channel 501 in the reverse direction (as shown by the dashed line V in the middle). Figure 8 The liquid flows into the second flow channel 302 of the first end cover again, and finally flows out of the first end cover 30 through the first liquid outlet 3022 of the second flow channel 302 (as shown in FIG. Figure 4 As shown by the three arrows extending out of the motor 1).

[0112] Similarly, the cooling medium that flows along the inner wall of the hollow shaft 10 to the second end cover 40 is thrown out from the oil throwing hole and flows along the cooling path formed by the third flow channel 402 of the second end cover 40, the second cooling channel 502, the second turning portion 303 of the first end cover 30, the second cooling channel 502, and the fourth flow channel 403, and finally flows out of the second end cover 40 from the liquid outlet of the fourth flow channel 403.

[0113] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A motor, characterized in that: include: A hollow shaft, inside of which a cooling medium flows; A plurality of rotor laminations are arranged around the hollow shaft, the plurality of rotor laminations comprising a plurality of first cooling channels extending in a first direction; A first end cover is provided with a plurality of first flow channels and second flow channels connected at an angle, one end of the first flow channel is connected to the hollow shaft, the other end of the first flow channel terminates near the edge of the first end cover, one end of the second flow channel passes through the edge of the first end cover, and the other end of the second flow channel is connected to the first flow channel; a second end cover, wherein the second end cover and the first end cover are respectively located on both sides of the axial direction of the multiple rotor laminations; the second end cover is provided with a plurality of first rotating parts, and along the first direction, the plurality of first rotating parts correspond one by one to the plurality of groups of first flow channels and second flow channels connected at an angle; Among them, along the first direction, the corresponding first rotating part is connected to the first flow channel and the second flow channel connected at an angle via the multiple first cooling channels, so that the cooling medium flowing inside the hollow shaft can flow into the first flow channel, and flow through a part of the first cooling channels in the multiple first cooling channels, the first rotating part, another part of the first cooling channels in the multiple first cooling channels, the second flow channel in sequence, and flow out of the first end cover from the second flow channel.

2. The motor according to claim 1, characterized in that The first flow channel includes a first part and a second part intersecting at an angle, the first part intersecting with the second flow channel, a first liquid inlet is provided at one end of the second part, and the first liquid inlet is connected to the hollow shaft via an oil-swinging hole provided on the hollow shaft.

3. The motor according to claim 2, characterized in that The first rotating portion is a closed triangular rotating flow channel.

4. The motor according to claim 3, characterized in that The first turning portion includes a third portion, a fourth portion, and a fifth portion that are connected to each other. Along the first direction, the third portion corresponds to the first portion of the first flow channel, and the fourth portion corresponds to the second flow channel.

5. The motor according to claim 1, characterized in that The multi-stack rotor laminations further include a plurality of second cooling channels extending along the first direction, the first end cover further includes a plurality of second turning portions, and the second end cover further includes a plurality of groups of third flow channels and fourth flow channels connected at an angle, wherein: Along the first direction, the plurality of second turning parts correspond one to one with the plurality of groups of third flow channels and fourth flow channels connected at an angle; One end of the third flow channel is connected to the hollow shaft, and the other end of the third flow channel terminates near the edge of the second end cover. One end of the fourth flow channel passes through the edge of the second end cover, and the other end of the fourth flow channel is connected to the third flow channel. Among them, along the first direction, the corresponding second rotating part is connected to the third flow channel and the fourth flow channel connected at an angle via the multiple second cooling channels, so that the cooling medium flowing inside the hollow shaft can flow into the third flow channel, and flow through a part of the second cooling channels in the multiple second cooling channels, the second rotating part, another part of the second cooling channels in the multiple second cooling channels, the fourth flow channel in sequence, and flow out of the second end cover from the fourth flow channel.

6. The motor according to claim 2, characterized in that Each of the rotor laminations is provided with a first slot group, the first slot group includes a plurality of first slots, each of the first slots penetrates the rotor lamination, a magnetic steel is provided in the first slot, a first air gap is formed between the magnetic steel and the inner wall of the first slot, and along the first direction, the corresponding first air gaps of the multiple rotor laminations correspond one by one and are connected to form the first cooling channel extending along the first direction.

7. The motor according to claim 6, characterized in that The width of the first portion and / or the second flow channel matches the width of the corresponding first notch to cover the first air gap.

8. The motor according to claim 7, characterized in that A width-narrowing portion is provided at a position of the first portion and / or the second flow channel corresponding to the magnetic steel to abut against the magnetic steel.

9. The motor according to claim 1, characterized in that The first end cover is provided with four groups of first flow channels and second flow channels intersecting at an angle, and the second end cover is provided with four first rotating parts.

10. The motor according to claim 1, characterized in that The first flow channel and the second flow channel intersect to form a Y-shaped flow channel.

11. A motor, characterized in that: include: A hollow shaft, inside of which a cooling medium flows; A plurality of rotor laminations are arranged around the hollow shaft; A first end cover and a second end cover are respectively located on two axial sides of the multi-stack rotor laminations; The first end cover is provided with a first flow channel that does not penetrate the edge of the first end cover and a second flow channel that penetrates the edge of the first end cover, and the second end cover is provided with a first turning portion that does not penetrate the edge of the second end cover, so that the cooling medium flowing inside the hollow shaft can flow into the first flow channel on the first end cover, flow through the multiple rotor laminations and then merge into the second end cover, pass through the first turning portion on the second end cover, and then flow back to the first end cover through the multiple rotor laminations, and then flow out of the motor through the second flow channel on the first end cover.

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