Motor

Abstract

The utility model discloses a motor, comprising a hollow shaft, the inside of which is used for liquid feeding; a rotor; the first end cover and the second end cover are located on the two axial sides of the rotor; the first forward rotation cooling path sequentially comprises a first flow channel located on the first end cover, a first cooling channel located on the rotor, a first connecting channel located on the second end cover, a second cooling channel located on the rotor and a first outflow part located on the first end cover. The first cooling channel and the second cooling channel correspond to the two ends of the first connecting channel respectively; when the motor rotates forwards, the cooling medium in the hollow shaft flows out of the motor through the first forward rotation cooling path; the first reverse cooling path sequentially comprises a second flow channel positioned on the first end cover, a third cooling channel positioned on the rotor and a second outflow part positioned on the second end cover; when the motor rotates reversely, the cooling medium in the hollow shaft flows out of the motor through the first reverse rotation cooling path. According to the utility model, the rotor can be effectively cooled under two conditions of forward rotation and reverse rotation at the same time.

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 the core component of the power system. It will generate a lot of heat due to energy loss during operation. At present, air cooling, liquid cooling, hybrid cooling and other methods are often used to dissipate heat from the stator winding of the electrode. However, in the motor cooling scheme, only the stator of the motor is cooled, but not the rotor. Therefore, a high amount of heat will be 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.

[0003] Currently, when cooling the rotor, if the motor rotor changes its rotation direction, the cooling medium cannot enter the rotor. Therefore, there is an urgent need for a rotor cooling solution that can have rotor cooling functions in different rotation directions and has a longer cooling path. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem of how to make the motor have the function of cooling the rotor in both forward and reverse rotation. The utility model provides a motor that can cool the rotor in both forward and reverse rotation, and the heat exchange area of ​​the rotor cooling path of the motor of the utility model is large.

[0005] In order to solve the above technical problems, the embodiment of the utility model discloses a motor, comprising:

[0006] A hollow shaft, inside of which a cooling medium flows;

[0007] Rotor;

[0008] A first end cover and a second end cover, wherein the first end cover and the second end cover are located on both axial sides of the rotor;

[0009] The first forward cooling path includes, in sequence: a first flow channel located at the first end cover, a first cooling channel located at the rotor, a first connecting channel located at the second end cover, a second cooling channel located at the rotor, and a first outflow portion located at the first end cover; the first cooling channel and the second cooling channel correspond to two ends of the first connecting channel respectively; when the motor rotates in the forward direction, the cooling medium in the hollow shaft can flow through the first forward cooling path;

[0010] The first reverse cooling path includes, in sequence: a second flow channel located at the first end cover, a third cooling channel located at the rotor, and a second outflow portion located at the second end cover; when the motor rotates in the reverse direction, the cooling medium in the hollow shaft can flow through the first reverse cooling path.

[0011] By adopting the above technical solution, when the motor of the embodiment of the present application rotates in the reverse direction, the cooling medium inside the hollow shaft can flow from the first end cover into a cooling channel (i.e., the third cooling channel) provided in the rotor (multiple groups of silicon steel sheets), and then merge into the second end cover, and flow out of the motor through the second outflow portion of the second end cover. That is to say, for example, multiple third cooling channels are provided in the multiple groups of silicon steel sheets, and the first end cover located on one axial side of the multiple groups of silicon steel sheets is used for liquid inlet, so that the cooling medium flows into the third cooling channel, thereby effectively cooling the multiple groups of silicon steel sheets, and finally flows out of the motor through the second end cover for liquid outlet.

[0012] At the same time, when the motor rotates in the forward direction, the cooling medium inside the hollow shaft can flow from the first end cover into a cooling channel (i.e., the first cooling channel) disposed in the rotor (multiple groups of silicon steel sheets), and then merge into the second end cover, and then flow from the second end cover in the reverse direction into another cooling channel (i.e., the second cooling channel) disposed in the multiple groups of silicon steel sheets, and then flow back to the first end cover, and finally flow out of the motor from the first end cover. In this process, effective cooling of the multiple groups of silicon steel sheets can also be achieved.

[0013] Therefore, the motor of the embodiment of the present application can effectively cool the multiple groups of silicon steel sheets through the first forward cooling path and the first reverse cooling path respectively when rotating in the forward direction and in the reverse direction. In addition, when the motor adopts the first forward cooling path, the cooling medium can circulate and cool the multiple groups of silicon steel sheets at least twice, that is, the first forward cooling path has a large heat exchange area, which can effectively enhance the convective heat exchange effect of the multiple groups of silicon steel sheets.

[0014] At the same time, when the motor of the embodiment of the present application adopts the first forward cooling path to cool the rotor, after the cooling medium finally flows out of the first end cover, it can be further thrown to the stator winding under the action of the centrifugal force of the motor, thereby further cooling the stator; correspondingly, when the motor of the embodiment of the present application adopts the first reverse cooling path to cool the rotor, after the cooling medium finally flows out of the second end cover, it can also be further thrown to the stator winding under the action of the centrifugal force of the motor, thereby further cooling the stator.

[0015] According to another specific embodiment of the utility model, the first flow channel and the second flow channel have a first overlapping portion, which is used to be connected to the hollow shaft; the non-overlapping portions of the first flow channel and the second flow channel are connected at an angle so that the cooling medium in the hollow shaft can switch between the first forward cooling path and the first reverse cooling path.

[0016] According to another specific embodiment of the utility model, it also includes:

[0017] a second forward cooling path, comprising, in sequence: a third flow channel located at the second end cover, a fourth cooling channel located at the rotor, a second connecting channel located at the first end cover, the third cooling channel located at the rotor, and the second outflow portion located at the second end cover; when the motor rotates in the forward direction, the cooling medium in the hollow shaft can flow through the second forward cooling path;

[0018] The second reverse cooling path includes, in sequence: a fourth flow channel located at the second end cover, a second cooling channel located at the rotor, and the first outflow portion located at the first end cover; when the motor rotates in the reverse direction, the cooling medium in the hollow shaft can flow through the second reverse cooling path.

[0019] By adopting the above technical solution, the motor of the embodiment of the present application can effectively cool multiple groups of silicon steel sheets through the second forward cooling path and the second reverse cooling path when rotating in the forward direction and the reverse direction, respectively.

[0020] In addition, when the motor adopts the second forward cooling path, the cooling medium can circulate and cool multiple groups of silicon steel sheets at least twice, that is, the second forward cooling path has a larger heat exchange area, which can effectively enhance the convective heat transfer effect of multiple groups of silicon steel sheets.

[0021] At the same time, when the motor of the embodiment of the present application adopts the second forward cooling path to cool the rotor, after the cooling medium finally flows out of the second end cover, it can be further thrown to the stator winding under the action of the centrifugal force of the motor, thereby further cooling the stator. Correspondingly, when the motor of the embodiment of the present application adopts the second reverse cooling path to cool the rotor, after the cooling medium finally flows out of the first end cover, it can also be further thrown to the stator winding under the action of the centrifugal force of the motor, thereby further cooling the stator.

[0022] According to another specific embodiment of the present invention, the rotor includes multiple groups of silicon steel sheets, and the multiple groups of silicon steel sheets are arranged around the hollow shaft; each group of the silicon steel sheets is provided with a plurality of magnetic steel slots, and magnetic steels are provided in the magnetic steel slots, and an air gap is formed between the inner wall of the magnetic steel slot and the magnetic steel, and along the axial direction, the corresponding air gaps of the multiple groups of silicon steel sheets correspond to each other and are connected to form a plurality of cooling channels extending along the axial direction, and the plurality of cooling channels include the first cooling channel, the second cooling channel, the third cooling channel, and the fourth cooling channel.

[0023] By adopting the above technical solution, in the embodiment of the present application, the magnetic steel and the inner wall of the magnetic steel slot can form an air gap, and multiple corresponding air gaps correspond to and are connected, thereby forming the above-mentioned multiple cooling channels. Therefore, the cooling medium in the hollow shaft can flow into the cooling channels formed by these corresponding air gaps, and conduct convection heat exchange with the rotor, thereby reducing the temperature of the magnetic steel and reducing the risk of motor demagnetization.

[0024] According to another specific embodiment of the utility model, the third flow channel and the fourth flow channel have a second overlapping portion, and the second overlapping portion is used to be connected to the hollow shaft; the non-overlapping portions of the third flow channel and the fourth flow channel are connected at an angle so that the cooling medium in the hollow shaft can switch between the second forward cooling path and the second reverse cooling path.

[0025] According to another specific embodiment of the utility model, the first end cover is provided with a plurality of groups of first cooling grooves, the plurality of groups of first cooling grooves are arranged at intervals along the circumferential direction, each group of the first cooling grooves includes a first Y-shaped groove and a first V-shaped groove, and the first Y-shaped groove is arranged at intervals from the first V-shaped groove in the adjacent first cooling groove, wherein:

[0026] The first Y-shaped groove includes a first slot, a second slot, and a third slot that are connected to each other; the first slot and the second slot intersect at an angle, one end of the third slot is connected to the hollow shaft, and the other end of the third slot is connected to the intersection of the first slot and the second slot;

[0027] The first V-shaped groove includes a fourth groove and a fifth groove connected at an angle; one end of the second connecting channel is connected to the fifth groove, and the other end of the second connecting channel is connected to the first groove;

[0028] The first flow channel includes the third slot and the second slot;

[0029] The second flow channel includes the third slot and the first slot;

[0030] The fourth slot includes a first outflow end, and the first outflow end passes through the edge of the first end cover;

[0031] The first outflow portion includes the first outflow end of the second slot.

[0032] According to another specific embodiment of the present invention, the width of any one or more of the first slot, the second slot, the fourth slot, and the fifth slot matches the width of the corresponding magnetic steel slot to cover the air gap.

[0033] According to another specific embodiment of the present invention, any one or more of the first slot, the second slot, the fourth slot, and the fifth slot are provided with a width-narrowing portion at a position corresponding to the corresponding magnetic steel to abut against the magnetic steel.

[0034] According to another specific embodiment of the utility model, the second end cover is provided with a plurality of groups of second cooling grooves, the plurality of groups of second cooling grooves are arranged at intervals along the circumferential direction, each group of the second cooling grooves includes a second Y-shaped groove and a second V-shaped groove, and the second Y-shaped groove is arranged at intervals from the second V-shaped groove in the adjacent second cooling groove, wherein:

[0035] The second Y-shaped groove includes a sixth groove, a seventh groove, and an eighth groove which are connected to each other; the sixth groove and the seventh groove intersect at an angle, one end of the eighth groove is connected to the hollow shaft, and the other end of the eighth groove is connected to the intersection of the sixth groove and the seventh groove;

[0036] The second V-shaped groove includes a ninth groove and a tenth groove which are connected to each other; one end of the first connecting channel is connected to the tenth groove, and the other end of the second connecting channel is connected to the sixth groove;

[0037] The third flow channel includes the seventh slot and the eighth slot;

[0038] The fourth flow channel includes the sixth slot and the eighth slot;

[0039] The ninth slot includes a second outflow end, and the second outflow end passes through the edge of the second end cover;

[0040] The second outflow portion includes the second outflow end of the ninth slot.

[0041] According to another specific embodiment of the utility model, along the axial direction, the first Y-shaped groove corresponds to the second V-shaped groove, and the first V-shaped groove corresponds to the second Y-shaped groove, wherein:

[0042] Along the axial direction, the connecting point between the second slot, the tenth slot and the first connecting channel corresponds to the first cooling channel;

[0043] Along the axial direction, the connecting point between the fourth slot, the sixth slot and the first connecting channel corresponds to the second cooling channel;

[0044] Along the axial direction, the ninth slot and the connecting point of the first slot and the second connecting channel correspond to the third cooling channel;

[0045] Along the axial direction, the connecting point between the seventh slot, the fifth slot and the second connecting channel corresponds to the fourth cooling channel.

[0046] The embodiment of the utility model further discloses a motor, comprising:

[0047] A hollow shaft, inside of which a cooling medium flows;

[0048] A rotor, arranged around the hollow shaft;

[0049] A first end cover and a second end cover, located on both axial sides of the rotor;

[0050] When the motor rotates in the forward direction, the cooling medium in the hollow shaft can flow into the first end cover, flow through the rotor and then merge into the second end cover, and the cooling medium in the second end cover can flow through the rotor in the reverse direction and then flow back to the first end cover and then flow out from the first end cover;

[0051] When the motor rotates in the reverse direction, the cooling medium in the hollow shaft can flow into the first end cover, flow through the rotor, merge into the second end cover, and then flow out from the second end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A three-dimensional diagram of a motor according to an embodiment of the utility model is shown.

[0053] Figure 2a A three-dimensional schematic diagram showing a first forward cooling path in a motor according to an embodiment of the utility model is shown.

[0054] Figure 2b A three-dimensional schematic diagram showing a first reverse cooling path in a motor according to an embodiment of the utility model.

[0055] Figure 3a A three-dimensional schematic diagram showing a second forward cooling path in the motor according to an embodiment of the utility model.

[0056] Figure 3b A three-dimensional schematic diagram showing a second reverse cooling path in the motor according to an embodiment of the utility model.

[0057] Figure 4 An exploded view of a rotor in an embodiment of the present invention is shown.

[0058] Figure 5 A front view of a group of silicon steel sheets of a rotor in an embodiment of the utility model is shown.

[0059] Figure 6 A front view of the first end cover in an embodiment of the utility model is shown.

[0060] Figure 7 A front view of the second end cover in an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] 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.

[0064] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0065] 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.

[0066] 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.

[0067] See also Figure 1 The embodiment of the present application provides a motor 1 capable of cooling a rotor. The motor 1 of the embodiment of the present application can achieve effective cooling of the rotor in both forward and reverse rotation conditions.

[0068] The motor 1 according to the embodiment of the present application includes a hollow shaft 10 , a rotor, a first end cover 30 and a second end cover 40 .

[0069] like Figure 1 As shown, the rotor of the embodiment of the present application includes an axial direction (such as Figure 1 Six groups of silicon steel sheets 20 are stacked (in the Z direction shown in FIG), and each group of silicon steel sheets 20 is composed of a plurality of thin sheets (i.e., thinner silicon steel sheets) stacked. The embodiment of the present application does not limit the number of thin sheets in each group of silicon steel sheets 20, and the number is selected according to the actual application of the motor. At the same time, although Figure 1 Six groups of silicon steel sheets 20 are shown by way of example, but the embodiment of the present application does not limit the number of groups of silicon steel sheets 20. For example, the motor 1 of the embodiment of the present application may also include three, four, seven, or other groups of silicon steel sheets 20.

[0070] It can be seen that the six groups of silicon steel sheets 20 are arranged around the hollow shaft 10, and the first end cover 30 and the second end cover 40 are respectively arranged in the axial direction of the six groups of silicon steel sheets 20 (such as Figure 1 That is, the first end cover 30 and the second end cover 40 are respectively connected to two groups of silicon steel sheets 20 located on both sides of the axial direction among the six groups of silicon steel sheets 20.

[0071] For example, Figure 1 As shown, the first end cover 30 is arranged on the left side of the six groups of silicon steel sheets 20 along the axial direction (i.e. Figure 1 The second end cover 40 is arranged on the right side of the six groups of silicon steel sheets 20 along the axial direction (i.e. Figure 1The side indicated by the Z2 direction in the figure, i.e., the N side). The embodiment of the present application does not limit this, that is, the first end cover 30 of the embodiment of the present application can be the front end cover of the motor 1, and the second end cover 40 can be the rear end cover of the motor 1, or the first end cover 30 can be the rear end cover of the motor 1, and correspondingly, the second end cover 40 can be the front end cover of the motor 1.

[0072] In a possible implementation, the hollow shaft 10 of the embodiment of the present application includes a first end 101 and a second end 102. Exemplarily, the second end 102 can be set as a closed end or an end capable of discharging liquid. Exemplarily, a drainage port 1011 is provided on the first 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 because the motor is dynamically balanced during operation, most of the inner wall of the hollow shaft 10 will be paved with cooling medium, that is, the cooling medium in the hollow shaft 10 can simultaneously supply liquid to the first end cover 30 and the second end cover 40.

[0073] For example, see Figure 3a Combined with Figure 1 A plurality of through holes are provided at positions of the hollow shaft 10 corresponding to the end covers (e.g., the first end cover 30, the second end cover 40), that is, a plurality of oil-slinging holes 103 (e.g., Figure 3a As shown in the figure, each oil-slinging hole 103 is connected to each first Y-shaped groove of the first end cover 30 to be described later, or each oil-slinging hole 103 is connected to each second Y-shaped groove of the second end cover 40 to be described later. Thus, liquid can be supplied to the first end cover 30 and the second end cover 40 when the motor is running. The cooling medium in the embodiment of the present application is a liquid with insulating cooling function such as cooling oil and insulating coolant, and the embodiment of the present application does not limit the cooling medium.

[0074] Continue reading Figure 1 , the motor 1 of the embodiment of the present application is in the positive direction (such as Figure 1 When the cooling medium in the hollow shaft 10 first flows into the first end cover 30, and then further flows in the first direction (such as Figure 1 e direction shown in FIG) flows through the six groups of silicon steel sheets 20 and then flows into the second end cover 40. At this time, the cooling medium in the second end cover 40 can flow along the second direction (such as Figure 1 The first direction (as shown in FIG. 1 ) flows through the six groups of silicon steel sheets 20 again, then flows back to the first end cover 30, and finally flows out of the first end cover 30. Figure 1 e direction shown in the figure) and a second direction (as shown in the figure) Figure 1At the same time, the cooling medium flowing in the hollow shaft 10 to the second end cover 40 enters the second end cover 40 from the oil-slinging hole provided on the hollow shaft 10 and the second Y-shaped groove of the second end cover 40, and further flows along the second direction (as shown in FIG. Figure 1 f direction shown in FIG) flows through the six groups of silicon steel sheets 20 and then flows into the first end cover 30; at the same time, the cooling medium in the first end cover 30 can flow along the first direction (such as Figure 1 e direction shown in FIG) flows through the six groups of silicon steel sheets 20 again, then flows back to the second end cover 40, and finally flows out from the second end cover 40 (hereinafter referred to as Figure 3a Detailed description).

[0075] For example, the first direction and the second direction are respectively aligned with the axial direction of the motor 1 (eg Figure 1 For example, the first direction and the second direction may also intersect with the axial direction of the motor 1, respectively. The embodiment of the present application does not limit the first direction and the second direction. As long as the cooling medium can flow back and forth through the six groups of silicon steel sheets 20, it belongs to the protection scope of the embodiment of the present application.

[0076] On the other hand, the motor 1 of the embodiment of the present application is rotated in the reverse direction (such as Figure 1 When the cooling medium in the hollow shaft 10 rotates in the direction B shown in the figure, it can first flow into the first end cover 30 and then flow along the first direction (for example, Figure 1 The cooling medium flows through the six groups of silicon steel sheets 20, then flows into the second end cover 40, and finally flows out directly from the second end cover 40. At the same time, the cooling medium flowing into the second end cover 40 in the hollow shaft 10 first flows into the second end cover 40, and then flows along the second direction (for example, Figure 1 f direction shown in the figure) flows through the six groups of silicon steel sheets 20, then flows into the first end cover 30, and finally flows directly out of the first end cover 30 (hereinafter referred to as Figure 3b Detailed description).

[0077] See also Figure 2a and Figure 2b , Figure 2a and Figure 2b Two cooling paths are shown as examples (wherein each cooling path includes a plurality of paths).

[0078] In order to simulate the flow state of the cooling medium, Figure 2a , Figure 2b The multiple cooling paths in the figure are displayed as solid forms (fluid domains). The structural features corresponding to each cooling path will be described in detail later. At the same time, in order to clearly display the cooling path, Figure 2a , Figure 2bAlthough the first end cover 30 , the second end cover 40 and the six groups of silicon steel sheets 20 are hidden respectively, the positions of the first end cover 30 , the six groups of silicon steel sheets 20 and the second end cover 40 are still schematically marked.

[0079] The motor according to the embodiment of the present application includes a first forward cooling path 50 and a first reverse cooling path 51 .

[0080] When the motor rotates in the forward direction, the cooling medium in the hollow shaft 10 can flow out of the motor through the first forward cooling path 50 ; at the same time, when the motor rotates in the reverse direction, the cooling medium in the hollow shaft 10 can flow out of the motor through the first forward cooling path 50 .

[0081] like Figure 2a As shown, Figure 2a Any two paths in the first forward cooling path 50 are exemplarily shown. Please refer to one of the first forward cooling paths 50 indicated by the dotted line part and the direction indicated by the arrow.

[0082] It can be seen that when the motor is in the positive direction (such as Figure 2a When the first forward cooling path 50 rotates in the direction A shown in the figure, the first forward cooling path 50 sequentially includes: a first flow channel 501 located at the first end cover 30, a first cooling channel 502 located at the rotor, a first connecting channel 503 located at the second end cover 40, a second cooling channel 504 located at the rotor, and a first outflow portion 505 located at the first end cover 30. Figure 2a In the direction A shown in FIG. 1 , illustratively, the first connecting channel 503 is in a straight line shape, and the first cooling channel 502 and the second cooling channel 504 correspond to the two ends of the first connecting channel 503 , respectively.

[0083] like Figure 2b As shown, Figure 2b Any two paths in the first reverse cooling path 51 are exemplarily shown. Please refer to one of the first reverse cooling paths 51 shown as a dotted line portion and the direction indicated by the arrow.

[0084] It can be seen that when the motor is in the reverse direction (such as Figure 2b When the motor rotates in the direction B shown in the figure, the first reverse cooling path 51 includes in sequence: a second flow channel 510 located at the first end cover 30, a third cooling channel 511 located at the rotor, and a second outflow portion 512 located at the second end cover 40; when the motor rotates in the reverse direction, the cooling medium in the hollow shaft 10 can flow out of the motor through the first reverse cooling path 51.

[0085] It should be noted that the interpretation of the forward rotation and the forward direction in the embodiment of the present application is: the counterclockwise direction relative to the side of the first end cover 30, for example, relative to Figure 1 The counterclockwise direction of the M side shown, i.e. Figure 2aA direction shown; at the same time, also relative to the clockwise direction of the second end cover 40 side, for example relative to Figure 1 The clockwise direction of the N side shown, that is, for example Figure 3a A direction shown.

[0086] The interpretation of the reverse and reverse in the embodiment of the present application is: relative to the clockwise direction of one side of the first end cover 30, for example, relative to Figure 1 The clockwise direction of the M side shown, i.e., for example Figure 2b At the same time, also relative to the second end cover 40 side counterclockwise direction, for example relative to Figure 1 The counterclockwise direction of the N side shown, that is, for example Figure 3b Direction B shown.

[0087] See also Figure 2a and Figure 2b In one possible implementation, it can be seen that Figure 2a The first flow channel 501 and Figure 2b The second flow channel 510 shown in the figure has a first overlapped portion (i.e., the third slot described later), the first overlapped portion is in a straight line shape, and one end of the first overlapped portion is used to communicate with the hollow shaft 10. Figure 2a The first flow channel 501 and Figure 2b The non-overlapping parts of the second flow channel 510 shown are connected at an angle. For example, the non-overlapping parts of the first flow channel 501 and the second flow channel 510 are connected at 90°. However, the embodiment of the present application does not limit the connection angle of the non-overlapping parts of the first flow channel 501 and the second flow channel 510. For example, it can also be 45°, 60°, 80°, etc.

[0088] Therefore, when the motor Figure 2a When the motor rotates in the A direction (i.e., in the positive direction), under the action of centrifugal force, the cooling medium in the hollow shaft 10 can flow along the first flow channel 501 and further flow through the remaining first positive cooling path 50 (as described above); Figure 2b When rotating in the B direction (i.e., in the reverse direction) as shown, the cooling medium in the hollow shaft 10 can flow along the second flow channel 510 under the action of centrifugal force, and further flow through the remaining first reverse cooling path 51 (as described above). That is, the first overlapping portion between the first flow channel 501 and the second flow channel 510 is used for liquid inlet, and the non-overlapping and angularly connected portion between the first flow channel 501 and the second flow channel 510 is used for switching between the first forward cooling path 50 and the first reverse cooling path 51 when the motor rotates forward or reverse.

[0089] See also Figure 1 to Figure 2b, adopting the above technical solution, when the motor 1 of the embodiment of the present application rotates in the reverse direction, the cooling medium inside the hollow shaft 10 can flow from the first end cover 30 into a cooling channel (i.e., the third cooling channel 511) provided in the rotor (six groups of silicon steel sheets 20), and then merge into the second end cover 40, and flow out of the motor 1 through the second outflow portion 512 of the second end cover 40. That is to say, for example, multiple third cooling channels 511 are provided in the six groups of silicon steel sheets 20, and the first end cover 30 located on one side of the multiple groups of silicon steel sheets 20 is used for liquid inlet, so that the cooling medium flows into the third cooling channel 511, thereby effectively cooling the multiple groups of silicon steel sheets 20, and finally flows out of the motor 1 through the second end cover 40 for liquid outlet.

[0090] At the same time, when the motor 1 rotates in the forward direction, the cooling medium in the hollow shaft 10 can flow from the first end cover 30 into a cooling channel (i.e., the first cooling channel 502) disposed in the rotor (six groups of silicon steel sheets 20), and then merge into the second end cover 40, and then flow from the second end cover 40 in the opposite direction into another cooling channel (i.e., the second cooling channel 504) disposed in the six groups of silicon steel sheets 20, and then flow back to the first end cover 30, and finally flow out of the motor 1 from the first end cover 30. In this process, the six groups of silicon steel sheets 20 can also be effectively cooled.

[0091] Therefore, the motor 1 of the embodiment of the present application can effectively cool the six groups of silicon steel sheets 20 through the first forward cooling path 50 and the first reverse cooling path 51 respectively when rotating in the forward direction and in the reverse direction. In addition, when the motor 1 adopts the first forward cooling path 50, the cooling medium can circulate and cool the six groups of silicon steel sheets 20 at least twice, that is, the first forward cooling path 50 has a large heat exchange area, which can effectively enhance the convection heat exchange effect of the six groups of silicon steel sheets 20.

[0092] At the same time, when the motor 1 of the embodiment of the present application adopts the first forward cooling path 50 for rotor cooling, after the cooling medium finally flows out of the first end cover 30, it can be further thrown to the stator winding under the action of the centrifugal force of the motor 1, thereby further cooling the stator; correspondingly, when the motor 1 of the embodiment of the present application adopts the first reverse cooling path 51 for rotor cooling, after the cooling medium finally flows out of the second end cover 40, it can also be further thrown to the stator winding under the action of the centrifugal force of the motor 1, thereby further cooling the stator.

[0093] See also Figure 1 The cooling scheme of the motor 1 of the embodiment of the present application also includes another possible implementation.

[0094] That is, the motor moves in the positive direction (such as Figure 1 When the cooling medium in the hollow shaft 10 rotates in the direction A shown in FIG. 1 , the cooling medium in the hollow shaft 10 can first flow into the second end cover 40 and then flow along the second direction (such as Figure 1 f direction shown in FIG) flows through the six groups of silicon steel sheets 20 and then flows into the first end cover 30. At this time, the cooling medium in the first end cover 30 can flow along the first direction (such as Figure 1 e direction shown in the figure) flows through the six groups of silicon steel sheets 20 again, then flows back to the second end cover 40, and finally flows out of the motor 1 from the second end cover 40.

[0095] At the same time, when the motor 1 is in the reverse direction (such as Figure 1 When the cooling medium in the hollow shaft 10 rotates in the direction B shown in the figure, it can first flow into the second end cover 40 and then flow into the second end cover 40 along the second direction (such as Figure 1 f direction shown in the figure) flows through the six groups of silicon steel sheets 20, then merges into the first end cover 30, and finally flows out of the motor 1 directly from the first end cover 30.

[0096] See also Figure 3a and Figure 3b , exemplarily, the motor of the embodiment of the present application also includes two other cooling paths.

[0097] Accordingly, each cooling path includes multiple paths. To facilitate the simulation of the flow state of the cooling medium, Figure 3a , Figure 3b The multiple cooling paths in are also displayed as solid forms (fluid domains), and the structural features corresponding to each cooling path will be described in detail later.

[0098] The motor in the embodiment of the present application further includes a second forward cooling path 52 and a second reverse cooling path 53 .

[0099] When the motor rotates in the forward direction, the cooling medium in the hollow shaft 10 can flow out of the motor through the second forward cooling path 52 ; at the same time, when the motor rotates in the reverse direction, the cooling medium in the hollow shaft 10 can flow out of the motor through the second reverse cooling path 53 .

[0100] like Figure 3a As shown, Figure 3a Any one of the second forward cooling paths 52 is exemplarily shown. Please refer to the second forward cooling path 52 shown as a dotted line portion and the direction indicated by the arrow.

[0101] It can be seen that when the motor is in the positive direction (such as Figure 3a When the rotor 100 rotates in the direction A shown in the figure, the second forward cooling path 52 sequentially includes: a third flow channel 521 located at the second end cover 40, a fourth cooling channel 522 located at the rotor, a second connecting channel 523 located at the first end cover 30, a third cooling channel 511 located at the rotor, and a second outflow portion 512 located at the second end cover 40. Figure 3aIn the direction A shown in FIG. 1 , the second connecting channel 523 is in a straight line shape. The third cooling channel 511 and the fourth cooling channel 522 correspond to the two ends of the second connecting channel 523 , respectively.

[0102] like Figure 3b As shown, Figure 3b Any two paths in the second reverse cooling path 53 are exemplarily shown. Please refer to one of the second reverse cooling paths 53 shown as a dotted line portion and the direction indicated by the arrow.

[0103] It can be seen that when the motor is in the reverse direction (such as Figure 3b When the motor rotates in the direction B shown in the figure, the second reverse cooling path 53 includes in sequence: a fourth flow channel 531 located at the second end cover 40, a second cooling channel 504 located at the rotor, and a first outflow portion 505 located at the first end cover 30; when the motor rotates in the reverse direction, the cooling medium in the hollow shaft 10 can flow out of the motor through the second reverse cooling path 53.

[0104] See also Figure 3a and Figure 3b In one possible implementation, it can be seen that Figure 3a The third flow channel 521 and Figure 3b The fourth flow channel 531 shown in FIG. 1 has a second overlapped portion, which is in a straight line shape. One end of the second overlapped portion is used to communicate with the hollow shaft 10. Figure 3a The third flow channel 521 and Figure 3b The non-overlapping parts of the fourth flow channel 531 shown are connected at an angle. For example, the non-overlapping parts of the third flow channel 521 and the fourth flow channel 531 are connected at 90°. However, the embodiment of the present application does not limit the connection angle of the non-overlapping parts of the third flow channel 521 and the fourth flow channel 531. For example, it can also be 45°, 60°, 80°, 101°, etc.

[0105] Therefore, when the motor Figure 3a When the motor rotates in the direction A (i.e., in the positive direction), under the action of centrifugal force, the cooling medium in the hollow shaft 10 can flow along the third flow channel 521 and further flow through the remaining second positive cooling path 52 (as described above); Figure 3b When rotating in the B direction (i.e., in the reverse direction) as shown, under the action of centrifugal force, the cooling medium in the hollow shaft 10 can flow along the fourth flow channel 531 and further flow through the remaining second reverse cooling path 53 (as described above). In other words, the second overlapping portion between the third flow channel 521 and the fourth flow channel 531 is used for liquid inlet, and the non-overlapping and angularly connected portion between the third flow channel 521 and the fourth flow channel 531 is used for switching between the second forward cooling path 52 and the second reverse cooling path 53 when the motor is in forward and reverse rotation.

[0106] See also Figure 1 and Figure 3a , Figure 3b By adopting the above technical solution, the motor 1 of the embodiment of the present application can effectively cool the six groups of silicon steel sheets 20 through the second forward cooling path 52 and the second reverse cooling path 53 when rotating in the forward direction and the reverse direction respectively.

[0107] In addition, when the motor 1 adopts the second forward cooling path 52, the cooling medium can circulate and cool the six groups of silicon steel sheets 20 at least twice, that is, the second forward cooling path 52 has a larger heat exchange area, which can effectively enhance the convective heat transfer effect of multiple groups of silicon steel sheets 20.

[0108] At the same time, when the motor 1 of the embodiment of the present application adopts the second forward cooling path 52 for rotor cooling, after the cooling medium finally flows out of the second end cover, it can be further thrown to the stator winding under the action of the centrifugal force of the motor 1, thereby further cooling the stator. Correspondingly, when the motor 1 of the embodiment of the present application adopts the second reverse cooling path 53 for rotor cooling, after the cooling medium finally flows out of the first end cover, it can also be further thrown to the stator winding under the action of the centrifugal force of the motor 1, thereby further cooling the stator.

[0109] See also Figures 1 to 3b The structural features corresponding to the first forward cooling path 50, the first reverse cooling path 51, the second forward cooling path 52, and the second reverse cooling path 53 will be described in detail below.

[0110] First, in the motor 1 of the embodiment of the present application, the cooling medium can flow between the six groups of silicon steel sheets 20. That is, the cooling medium can flow along the first cooling channel, the second cooling channel, the third cooling channel and the fourth cooling channel of the four cooling paths.

[0111] The principle is that, see Figure 4 and Figure 5 , Figure 4 The exploded view of six groups of silicon steel sheets 20 is shown as an example. Figure 5 A front view of one group of silicon steel sheets 20 is shown as an example, and the structures of the other five groups of silicon steel sheets 20 are the same.

[0112] It can be seen that each group of silicon steel sheets 20 includes eight groups of first slot groups 200 and eight groups of second slot groups 210. The embodiment of the present application does not limit the number of first slot groups 200 and second slot groups 210. For example, six, eight, or ten groups of first slot groups 200 and second slot groups 210 can be set respectively, and the selection is made according to the actual application of the motor (such as an electromagnetic solution).

[0113] Each first slot group 200 (such as Figure 5 The first magnetic steel slots 201 and the second magnetic steel slots 211 are arranged in an axial direction (as shown by the dashed line T). Figure 4 The Z direction shown in FIG) penetrates the silicon steel sheet 20.

[0114] It should be noted that the embodiment of the present application is based on the first slot group 200 (such as Figure 5 The cooling scheme is implemented as shown by the dashed line T in the middle. That is, the first cooling channel, the second cooling channel, the third cooling channel and the fourth cooling channel mentioned above are related to the first magnetic steel slot 201 in the first slot group 200 (described in detail later). Therefore, this article only describes the structure of the first slot group 200 in detail, and does not repeat the second magnetic group 210.

[0115] Continue reading Figure 4 and Figure 5 , each first magnetic steel slot 201 is provided with a magnetic steel 70, for ease of understanding, Figure 5 Only a part of the magnetic steel 70 is shown as an example.

[0116] It can be seen that an air gap 2000 is formed between the inner wall of the first magnetic steel slot 201 and the corresponding magnetic steel 70. The air gap 2000 is axially (eg Figure 4 The Z direction shown in FIG. 1 ) penetrates the corresponding silicon steel sheet 20.

[0117] For example, along the axial direction (such as Figure 4 The air gaps 2000 of the six groups of silicon steel sheets 20 correspond to each other and are connected one by one, thereby forming a plurality of cooling channels extending along the first direction or along the second direction.

[0118] For example, see Figure 4 and Figure 5 Combined with Figure 2a The aforementioned first cooling channel 502 is composed of six groups of silicon steel sheets 20 corresponding to six air gaps 2000 along the first direction (such as Figure 4 The aforementioned second cooling channel 504 is formed by six air gaps 2000 corresponding to six groups of silicon steel sheets 20 along the second direction (such as Figure 4 The f direction shown in the figure) corresponds to and is connected to form.

[0119] For example, see Figure 4 and Figure 5 Combined with Figure 2b The aforementioned third cooling channel 511 is composed of six groups of silicon steel sheets 20 corresponding to six air gaps 2000 along the first direction (such as Figure 4 The e direction shown in FIG. 1 corresponds to and is connected to form the

[0120] For another example, see Figure 4 and Figure 5 Combined with Figure 3a The aforementioned fourth cooling channel 522 is composed of six groups of silicon steel sheets 20 corresponding to six air gaps 2000 along the second direction (such as Figure 4 The f direction shown in the figure) corresponds to and is connected to form.

[0121] On this basis, see Figure 6 In a possible implementation manner, the first end cover 30 of the embodiment of the present application is provided with four groups of first cooling grooves 300. The four groups of first cooling grooves 300 are arranged along the circumferential direction (eg Figure 6 W1 direction) shown in the figure.

[0122] The embodiment of the present application does not limit the number of groups of the first cooling grooves 300, and three, four, five, etc. groups may be set. As long as it can cover the cooling channels formed by the corresponding air gaps of the aforementioned silicon steel sheets and realize the circulation of the aforementioned first forward cooling path, the first reverse cooling path, the second forward cooling path, and the second reverse cooling path, they all fall within the protection scope of the embodiment of the present application.

[0123] It can be seen that each group of first cooling grooves 300 includes a first Y-shaped groove 301 and a first V-shaped groove 302. The first Y-shaped groove 301 and the first V-shaped groove in each group of first cooling grooves 300 are connected through the aforementioned second connecting channel 523, and the first Y-shaped groove 301 in each group of first cooling grooves 300 is spaced apart from the first V-shaped groove 302 in the adjacent first cooling groove 300.

[0124] See also Figure 6 Combined with Figure 2a and Figure 2b The first Y-shaped groove 301 includes a first slot 3011, a second slot 3012, and a third slot 3013 that are connected. The first slot 3011 and the second slot 3012 intersect and are connected at an angle, and one end of the third slot 3013 is connected to the hollow shaft 10. For example, one end of the third slot 3013 is connected to the above-mentioned oil-slinging hole of the hollow shaft 10 (refer to Figure 3a The other end of the third slot 3013 is connected to the intersection of the first slot 3011 and the second slot 3012.

[0125] In one possible implementation, see Figure 6 Combined with Figure 2a , Figure 2b and Figure 5 The intersection of the first slot 3011, the second slot 3012, and the third slot 3013 can also correspond to two other cooling channels (the fifth cooling channel 601 and the sixth cooling channel 602). The fifth cooling channel 601 and the sixth cooling channel 602 are respectively, for example Figure 5The air gap 2000 indicated by the middle dotted line P is connected in the first direction or the second direction to form two cooling channels.

[0126] exist Figure 6 In the example shown, the width of the third slot 3013 matches the diameter of the oil-slinging hole 103 provided on the hollow shaft 10, for example, is substantially equal to or slightly larger than the diameter of the oil-slinging hole 103, so that the cooling medium flows from the oil-slinging hole 103 into the third slot 3013. It should be understood that the eighth slot 4013 described below (such as Figure 7 ) may also have similar features.

[0127] In one possible embodiment, the width of the first slot 3011 and the second slot 3012 matches the width of the first magnetic steel slot 201 , for example, covering the first magnetic steel slot 201 so as to cover the air gap 2000 , so that the cooling medium flows in the first slot 3011 and the second slot 3012 and can flow through the air gap 2000 .

[0128] The definition of matching the width of the magnetic steel slot in this article is: the width of the slot is greater than or equal to the width of the corresponding magnetic steel slot, that is, in both cases, the slot can better cover the air gap of the corresponding magnetic steel slot. However, it should be noted that the width of the slot can also be smaller than the width of the corresponding magnetic steel slot. It should be understood that although the width of the slot is smaller than the width of the corresponding magnetic steel slot, it will affect the effect of the cooling medium in the slot covering the corresponding air gap, but in this case, a small amount of cooling medium can still flow into the air gap of the corresponding magnetic steel slot, which will not affect the basic function of the motor in the embodiment of the present application. Therefore, the embodiment of the present application does not limit this.

[0129] Furthermore, the above-mentioned width requirement that needs to match the width of the first magnetic steel slot 201 may be only for the first slot 3011 or only for the second slot 3012. In addition, any one or more of the fourth slot 3021, the fifth slot 3022, the sixth slot 4011, the seventh slot 4012, the ninth slot 4021, and the tenth slot 40222 described later may also exemplarily have this setting method.

[0130] See also Figure 6 In a possible implementation manner, the first slot 3011 and the second slot 3012 are at positions corresponding to the magnetic steel 70 (for example, Figure 6In the example shown, the middle part of the first slot 3011 and the second slot 3012 is provided with a narrowed width portion 310, which is used to abut against the corresponding magnetic steel 70 to prevent the magnetic steel 70 from completely or partially escaping from the first magnetic steel slot 201 and entering the first slot 3011 or the second slot 3012. Any one or more of the fourth slot 3021, the fifth slot 3022, the sixth slot 4011, the seventh slot 4012, the ninth slot 4021, and the tenth slot 4022 described below may also have similar features.

[0131] For example, Figure 2a As shown, when the motor moves in the positive direction (such as Figure 2a When the cooling medium rotates in the direction A shown in FIG. 3 , the cooling medium can flow into the fifth cooling channel 601 at the intersection of the first slot 3011, the second slot 3012, and the third slot 3013, and then flow along the path L1 (as shown in FIG. Figure 2a The liquid flows along the path indicated by the dashed arrow in the middle) to the second end cover 40, and then along the path L3 (such as Figure 2a The liquid flows into the first connecting channel 503 (the path indicated by the dashed arrow), then continues to flow into the second cooling channel 504, and finally flows out of the motor through the first outflow portion 505.

[0132] At the same time, the cooling medium can flow into the sixth cooling channel 602 at the intersection of the first slot 3011, the second slot 3012, and the third slot 3013, and then flow along the path L2 (such as Figure 2a The liquid flows along the path indicated by the dashed arrow in the middle) to the second end cover 40, and then also along the path L3 (as shown in FIG. Figure 2a The liquid cools the motor via the first connecting channel 503 (the path indicated by the dashed arrow in the middle), then continues to flow into the second cooling channel 504, and finally flows out of the motor via the first outflow portion 505.

[0133] For example, Figure 2b As shown, when the motor rotates in the reverse direction (such as Figure 2b When the cooling medium rotates in the direction B shown in the figure, the cooling medium can flow into the fifth cooling channel 601 and the sixth cooling channel 602 at the intersection of the first slot 3011, the second slot 3012 and the third slot 3013. At this time, the fifth cooling channel 601 flows along the path L1' and the path L3', and the sixth cooling channel 602 flows along the path L2' and the path L3'.

[0134] Correspondingly, when the second forward cooling path and the second reverse cooling path described below are used, they also exemplarily include a fifth cooling channel 601 and a sixth cooling channel 602, and the cooling medium flows in the same manner as described above, which will not be described in detail below.

[0135] See also Figure 6 Combined with Figure 2a and Figure 2b The first V-shaped groove 302 includes a fourth groove 3021 and a fifth groove 3022 connected at an angle. One end of the second connecting channel 523 (i.e. Figure 6 The end indicated by the direction c in the middle) is connected to the fifth slot 3022, and the other end of the second connecting channel 523 (i.e. Figure 6 The end indicated by the direction d in the figure is connected to the first groove 3011.

[0136] See also Figure 6 Combined with Figure 2a It can be seen that the first flow channel 501 in the first forward cooling path 50 includes a third slot 3013 and a second slot 3012. Figure 6 Combined with Figure 2b It can be seen that the second flow channel 510 in the aforementioned first reverse cooling path 50 includes a third groove 3013 and a first groove 3011 .

[0137] That is, see Figure 6 Combined with Figure 2a and Figure 2b Due to the above-mentioned arrangement of the first slot 3011, the second slot 3012, and the third slot 3013 in the first Y-shaped slot 301, the cooling medium in the hollow shaft 10 can enter the first Y-shaped slot 301 through the third slot 3013, and then flow in the extension direction of the second slot 3012 (so that the third slot 3013 and the second slot 3012 constitute the aforementioned first flow channel 501) under the action of centrifugal forces in different directions of the motor, or flow in the extension direction of the first slot 3011 (so that the third slot 3013 and the first slot 3011 constitute the aforementioned second flow channel 510).

[0138] See also Figure 6 Combined with Figure 2a and Figure 5 Exemplarily, the fourth slot 3021 includes a first outflow end 30211 that passes through an edge of the first end cover 30 .

[0139] Combined with the previous text, we can know that when the motor is in the positive direction (such as Figure 2aWhen the hollow shaft 10 rotates in the direction A shown in the figure, the cooling medium in the hollow shaft 10 can flow into the third slot 3013 of the first Y-shaped slot, merge into the second slot 3012 under the action of centrifugal force, and then flow through the first cooling channel 502 formed by the corresponding air gaps 2000 in the six groups of silicon steel sheets 20, and then merge into the first connecting channel 503 of the second end cover 40, and then flow in the opposite direction along the second cooling channel 504 formed by the corresponding air gaps 2000 in the six groups of silicon steel sheets 20 again, until it flows into the fourth slot 3021 of the adjacent and spaced first V-shaped slot, and the adjacent and spaced fourth slot 3021 serves as the first outflow portion 505 in the first forward cooling path 50, and finally is thrown out of the motor from the first outflow end 30211 of the fourth slot 3021.

[0140] Also, see Figure 7 In a possible implementation manner, the second end cover 40 of the embodiment of the present application is provided with four groups of second cooling slots 400. The four groups of second cooling slots 400 are arranged along the circumferential direction (eg Figure 7 W2 direction) shown in FIG.

[0141] The embodiment of the present application does not limit the number of groups of the second cooling grooves 400, and three, four, five, etc. groups may be set. As long as it can cover the cooling channels formed by the corresponding air gaps of the aforementioned silicon steel sheets and realize the circulation of the aforementioned first forward cooling path, the first reverse cooling path, the second forward cooling path, and the second reverse cooling path, they all fall within the protection scope of the embodiment of the present application.

[0142] It can be seen that each group of second cooling grooves 400 includes a second Y-shaped groove 401 and a second V-shaped groove 402. The second Y-shaped groove 401 and the second V-shaped groove 402 in each group of second cooling grooves 400 are connected through the aforementioned first connecting channel 503. The second Y-shaped groove 401 in each group of second cooling grooves 400 is spaced apart from the second V-shaped groove 402 in the adjacent second cooling groove 400.

[0143] See also Figure 7 Combined with Figure 3a and Figure 3b The second Y-shaped groove 401 includes a sixth groove 4011, a seventh groove 4012, and an eighth groove 4013 that are connected. The sixth groove 4011 and the seventh groove 4012 intersect and are connected at an angle, and one end of the eighth groove 4013 is connected to the hollow shaft 10, for example, one end of the eighth groove 4013 is connected to the above-mentioned oil-slinging hole of the hollow shaft 10. The other end of the eighth groove 4013 is connected to the intersection of the sixth groove 4011 and the seventh groove 4012.

[0144] See also Figure 7 Combined with Figure 3a and Figure 3bThe second V-shaped groove 402 includes a ninth groove 4021 and a tenth groove 4022 which are connected. One end of the first connecting channel 503 (i.e. Figure 6 The end indicated by the direction c in the middle) is connected to the tenth slot 4022, and the other end of the second connecting channel 523 (i.e. Figure 6 The end indicated by the direction d in the middle is connected to the sixth groove 4011.

[0145] See also Figure 6 Combined with Figure 3a The third flow channel 521 in the second forward cooling path 52 includes a seventh slot 4012 and an eighth slot 4013. Figure 6 Combined with Figure 3b It can be seen that the fourth flow channel 531 in the aforementioned second forward cooling path 52 includes a sixth slot 4011 and an eighth slot 4013 .

[0146] That is, see Figure 6 Combined with Figure 3a and Figure 3b Due to the above-mentioned arrangement of the sixth slot 4011, the seventh slot 4012, and the eighth slot 4013 in the second Y-shaped slot 401, the cooling medium in the hollow shaft 10 can enter the second Y-shaped slot 401 through the eighth slot 4013, and then flow in the extension direction of the seventh slot 4012 (so that the eighth slot 4013 and the seventh slot 4012 constitute the aforementioned third flow channel 521) or flow in the extension direction of the sixth slot 4011 (so that the eighth slot 4013 and the sixth slot 4011 constitute the aforementioned fourth flow channel 531) under the action of centrifugal forces in different directions of the motor.

[0147] See also Figure 7 Combined with Figure 3a Exemplarily, the ninth slot 4021 includes a second outflow end 40211 that passes through an edge of the second end cover 40 .

[0148] Combined with the previous text, we can know that when the motor is in the positive direction (such as Figure 3a When the hollow shaft 10 rotates in the direction A shown in the figure, the cooling medium in the hollow shaft 10 can flow into the eighth slot 4013 of the second Y-shaped slot, merge into the seventh slot 4012 under the action of centrifugal force, and then flow through the fourth cooling channel 522 formed by the corresponding air gaps 2000 in the six groups of silicon steel sheets 20, and then merge into the second connecting channel 523 of the first end cover 30, and then flow in the opposite direction along the third cooling channel 511 formed by the corresponding air gaps 2000 in the six groups of silicon steel sheets 20, until it flows into the ninth slot 4021 of the adjacent and spaced second V-shaped slot, and the adjacent and spaced ninth slot 4021 serves as the second outflow portion 512 in the second forward cooling path 52, and finally is thrown out of the motor from the second outflow end 40211 of the ninth slot 4021.

[0149] In one possible implementation, see Figures 1 to 7 , along the axial direction (such as Figure 1 In the Z direction shown in FIG, the first Y-shaped groove 301 corresponds to the second V-shaped groove 402, and the first V-shaped groove 302 corresponds to the second Y-shaped groove 401.

[0150] It can be seen that, along the axial direction, the connecting point of the second slot 3012, the tenth slot 4022 and the first connecting channel 503 corresponds to the first cooling channel 502. Along the axial direction, the connecting point of the fourth slot 3021, the sixth slot 4011 and the first connecting channel 503 corresponds to the second cooling channel 504. Along the axial direction, the connecting point of the ninth slot 4021, the first slot 3011 and the second connecting channel 523 corresponds to the third cooling channel 511. Along the axial direction, the connecting point of the seventh slot 4012, the fifth slot 3022 and the second connecting channel 523 corresponds to the fourth cooling channel 522.

[0151] Based on this, combined with the above, it can be seen that when the motor 1 is in the reverse direction (such as Figure 3b When the hollow shaft 10 rotates in the direction B shown in the figure, the cooling medium in the hollow shaft 10 can flow into the eighth slot 4013 of the second Y-shaped slot, merge into the seventh slot 4012 under the action of centrifugal force, and then flow through the second cooling channel 504 formed by the corresponding air gaps 2000 in the six groups of silicon steel sheets 20, and then merge into the fourth slot 3021 of the first end cover 30 (the fourth slot 3021 serves as the first outflow portion 505), and is thrown out of the motor 1 from the first outflow end 30211 of the fourth slot 3021.

[0152] Combined with the above, it can be seen that when the motor 1 is in the reverse direction (such as Figure 2b When the hollow shaft 10 rotates in the direction B shown in the figure, the cooling medium in the hollow shaft 10 can flow into the third slot 3013 of the first Y-shaped slot, merge into the first slot 3011 under the action of centrifugal force, and then flow through the third cooling channel 511 formed by the corresponding air gaps 2000 in the six groups of silicon steel sheets 20, and then merge into the ninth slot 4021 of the second end cover 40 (the ninth slot 4021 serves as the second outflow portion 512), and is thrown out of the motor 1 from the second outflow end 40211 of the ninth slot 4021.

[0153] 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; Rotor; A first end cover and a second end cover, wherein the first end cover and the second end cover are located on both axial sides of the rotor; The first forward cooling path includes, in sequence: a first flow channel located at the first end cover, a first cooling channel located at the rotor, a first connecting channel located at the second end cover, a second cooling channel located at the rotor, and a first outflow portion located at the first end cover; the first cooling channel and the second cooling channel correspond to two ends of the first connecting channel respectively; when the motor rotates in the forward direction, the cooling medium in the hollow shaft can flow through the first forward cooling path; The first reverse cooling path includes, in sequence: a second flow channel located at the first end cover, a third cooling channel located at the rotor, and a second outflow portion located at the second end cover; when the motor rotates in the reverse direction, the cooling medium in the hollow shaft can flow through the first reverse cooling path.

2. The motor according to claim 1, characterized in that The first flow channel and the second flow channel have a first overlapping portion, which is used to be connected to the hollow shaft; the non-overlapping portions of the first flow channel and the second flow channel are connected at an angle so that the cooling medium in the hollow shaft can switch between the first forward cooling path and the first reverse cooling path.

3. The motor according to claim 1 or 2, characterized in that: Also includes: a second forward cooling path, comprising, in sequence: a third flow channel located at the second end cover, a fourth cooling channel located at the rotor, a second connecting channel located at the first end cover, the third cooling channel located at the rotor, and the second outflow portion located at the second end cover; when the motor rotates in the forward direction, the cooling medium in the hollow shaft can flow through the second forward cooling path; The second reverse cooling path includes, in sequence: a fourth flow channel located at the second end cover, a second cooling channel located at the rotor, and the first outflow portion located at the first end cover; when the motor rotates in the reverse direction, the cooling medium in the hollow shaft can flow through the second reverse cooling path.

4. The motor according to claim 3, characterized in that The rotor includes multiple groups of silicon steel sheets, which are arranged around the hollow shaft; each group of silicon steel sheets is provided with multiple magnetic steel slots, magnetic steels are arranged in the magnetic steel slots, and air gaps are formed between the inner walls of the magnetic steel slots and the magnetic steels. Along the axial direction, the corresponding air gaps of the multiple groups of silicon steel sheets correspond to each other and are connected to form multiple cooling channels extending along the axial direction, and the multiple cooling channels include the first cooling channel, the second cooling channel, the third cooling channel, and the fourth cooling channel.

5. The motor according to claim 4, characterized in that The third flow channel and the fourth flow channel have a second overlapping portion, and the second overlapping portion is used to be connected to the hollow shaft; the non-overlapping portions of the third flow channel and the fourth flow channel are connected at an angle so that the cooling medium in the hollow shaft can switch between the second forward cooling path and the second reverse cooling path.

6. The motor according to claim 5, characterized in that The first end cover is provided with a plurality of groups of first cooling grooves, the plurality of groups of first cooling grooves are arranged at intervals along the circumferential direction, each group of the first cooling grooves includes a first Y-shaped groove and a first V-shaped groove, the first Y-shaped groove is arranged at intervals from the first V-shaped groove in the adjacent first cooling groove, wherein: The first Y-shaped groove includes a first slot, a second slot, and a third slot that are connected to each other; the first slot and the second slot intersect at an angle, one end of the third slot is connected to the hollow shaft, and the other end of the third slot is connected to the intersection of the first slot and the second slot; The first V-shaped groove includes a fourth groove and a fifth groove connected at an angle; one end of the second connecting channel is connected to the fifth groove, and the other end of the second connecting channel is connected to the first groove; The first flow channel includes the third slot and the second slot; The second flow channel includes the third slot and the first slot; The fourth slot includes a first outflow end, and the first outflow end passes through the edge of the first end cover; The first outflow portion includes the first outflow end of the second slot.

7. The motor according to claim 6, characterized in that The width of any one or more of the first slot, the second slot, the fourth slot, and the fifth slot matches the width of the corresponding magnetic steel slot to cover the air gap.

8. The motor according to claim 6, characterized in that Any one or more of the first slot, the second slot, the fourth slot, and the fifth slot are provided with a width-narrowing portion at a position corresponding to the corresponding magnetic steel to abut against the magnetic steel.

9. The motor according to claim 6, characterized in that The second end cover is provided with a plurality of groups of second cooling grooves, the plurality of groups of second cooling grooves are arranged at intervals along the circumferential direction, each group of the second cooling grooves includes a second Y-shaped groove and a second V-shaped groove, and the second Y-shaped groove is arranged at intervals from the second V-shaped groove in the adjacent second cooling groove, wherein: The second Y-shaped groove includes a sixth groove, a seventh groove, and an eighth groove which are connected to each other; the sixth groove and the seventh groove intersect at an angle, one end of the eighth groove is connected to the hollow shaft, and the other end of the eighth groove is connected to the intersection of the sixth groove and the seventh groove; The second V-shaped groove includes a ninth groove and a tenth groove which are connected to each other; one end of the first connecting channel is connected to the tenth groove, and the other end of the second connecting channel is connected to the sixth groove; The third flow channel includes the seventh slot and the eighth slot; The fourth flow channel includes the sixth slot and the eighth slot; The ninth slot includes a second outflow end, and the second outflow end passes through the edge of the second end cover; The second outflow portion includes the second outflow end of the ninth slot.

10. The motor according to claim 9, characterized in that Along the axial direction, the first Y-shaped groove corresponds to the second V-shaped groove, and the first V-shaped groove corresponds to the second Y-shaped groove, wherein: Along the axial direction, the connecting point between the second slot, the tenth slot and the first connecting channel corresponds to the first cooling channel; Along the axial direction, the connecting point between the fourth slot, the sixth slot and the first connecting channel corresponds to the second cooling channel; Along the axial direction, the ninth slot and the connecting point of the first slot and the second connecting channel correspond to the third cooling channel; Along the axial direction, the connecting point between the seventh slot, the fifth slot and the second connecting channel corresponds to the fourth cooling channel.

11. A motor, characterized in that: include: A hollow shaft, inside of which a cooling medium flows; A rotor, arranged around the hollow shaft; A first end cover and a second end cover, located on both axial sides of the rotor; When the motor rotates in the forward direction, the cooling medium in the hollow shaft can flow into the first end cover, flow through the rotor and then merge into the second end cover, and the cooling medium in the second end cover can flow through the rotor in the reverse direction and then flow back to the first end cover and then flow out from the first end cover; When the motor rotates in the reverse direction, the cooling medium in the hollow shaft can flow into the first end cover, flow through the rotor, merge into the second end cover, and then flow out from the second end cover.

Images