Oil-cooled motor stator with oil blocking structure and motor

Abstract

The application relates to an oil-cooled motor stator with an oil blocking structure and a motor and relates to the technical field of motors. The application comprises a shell and a stator core arranged in the shell, and a stator winding is arranged in the stator core. The shell comprises a casing for covering the stator core and an end cover arranged at the end of the casing. An oil inlet hole is arranged at the top of the casing, and an oil outlet hole is arranged at the bottom of the casing. A circumferential shunt channel is arranged between the casing and the stator core and is communicated with the oil inlet hole and the oil outlet hole. A plurality of groups of shunt grooves are arranged on the outer circumferential wall of the stator core and are communicated with the circumferential shunt channel. A plurality of groups of oil injection hole channels are arranged on the two sides of the circumferential shunt channel and are communicated with the circumferential shunt channel. An oil blocking piece is arranged on the inner circumferential wall of the shell and is used for guiding the cooling medium sprayed by each group of oil injection hole channels to the cross-overlapping position of the stator winding end. The application has the effects of simplifying the oil cooling structure of the motor stator and efficiently cooling the motor stator.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric machines, in particular to an oil-cooled electric machine stator with an oil blocking structure. BACKGROUND

[0002] The electric machine stator is the stationary part of the electric motor, and is mainly composed of a stator core, a stator winding and a machine base. The main function of the stator is to generate a rotating magnetic field to cooperate with the rotor to be cut by the magnetic lines of force in the rotating magnetic field and thus generate an electric current.

[0003] At present, with the rapid development of the new energy automobile industry, the lightening of the automobile improves the integration requirement of the electric drive system, which causes the compression of the structure and the cooling system, and the heat dissipation requirement of the electric machine is higher and higher. The oil-cooled heat dissipation modes of the widely used electric machine stator mainly have two types: one is that the oil cooling only cools the winding end part; and the other is that the oil liquid cools the stator core and the winding end part at the same time.

[0004] In the related art, an oil-cooled electric machine stator is provided with an oil inlet outside the machine shell, and the oil enters one end of the stator end part. A plurality of small holes are formed in the outer circle of the stator core, and then the oil liquid enters the other end of the stator end part. An oil collecting groove is formed at one end of the stator end part by using the machine shell structure, and the machine shell and the stator core form a seal. At the other end of the stator end part, an oil collecting ring is provided, and the oil collecting ring is sealed with the machine shell and the stator core on both sides. A plurality of small holes are formed on the oil collecting ring and point to the winding end part. The oil liquid is sprayed to the winding end part from the small holes, and thus the winding end part is cooled.

[0005] According to the related art, the structure for guiding the cooling oil in the machine shell and the sealing cooperation structure with the stator core are too complex, which greatly increases the machining difficulty of the overall equipment, and thus needs to be improved. SUMMARY

[0006] In order to improve the problem that the oil cooling structure of the traditional electric machine stator is too complex, the application provides an oil-cooled electric machine stator with an oil blocking structure.

[0007] The oil-cooled electric machine stator with an oil blocking structure provided by the application adopts the following technical scheme:

[0008] The oil-cooled motor stator with an oil blocking structure comprises a shell and a stator core arranged in the shell, and a stator winding is arranged around the stator core; the shell comprises a casing for covering the stator core and an end cover arranged at the end of the casing; an oil inlet hole is formed through the top of the casing, and an oil outlet hole is formed through the bottom of the casing; a circumferential flow channel is arranged between the inner circumferential wall of the casing and the outer circumferential wall of the stator core and is in communication with the oil inlet hole and the oil outlet hole, and the circumferential flow channel extends along the circumference of the stator core; a plurality of groups of flow grooves are formed in the outer circumferential wall of the stator core and are in communication with the circumferential flow channel, and the flow grooves are arranged at intervals along the circumference of the stator core; a plurality of groups of oil injection holes are formed on both sides of the circumferential flow channel in the width direction and are in communication with the circumferential flow channel; an oil blocking piece is arranged on the inner circumferential wall of the casing and is arranged along the circumference of the stator core, and the oil blocking piece is used to guide the cooling medium sprayed by each group of oil injection holes to the overlapping position at the end of the stator winding.

[0009] By adopting the above technical scheme, the cooling medium is introduced into the circumferential flow channel through the oil inlet hole, the cooling medium in the circumferential flow channel exchanges heat with the outer circumferential wall of the stator core through the flow grooves, so as to cool the stator core; the cooling medium in the flow grooves is sprayed out through the oil injection holes and collides with the oil blocking piece, so as to change the direction of the cooling medium and accurately spray and cool the overlapping position at the end of the stator winding, thereby simplifying the overall oil cooling structure and improving the oil cooling effect of the motor; and the circumferential flow channel and the flow grooves make the cooling medium as close as possible to the outer surface of the stator core, which helps to improve the electromagnetic and mechanical properties of the motor.

[0010] Preferably, the oil injection holes are formed in the end wall of the stator core, and each oil injection hole is in communication with the corresponding flow groove.

[0011] By adopting the above technical scheme, the oil injection holes are formed in the end of the stator core, and the oil injection holes can be formed by only opening holes in the stamping sheet at the end of the stator core, thereby simplifying the machining steps and difficulty of the casing.

[0012] Preferably, the oil blocking piece comprises an oil blocking ring plate, the oil blocking ring plate is arranged on the inner circumferential wall of the casing and the end cover and is located on both sides of the stator core in the width direction, each oil blocking ring plate is provided with a guide surface on the side wall facing the stator core, and the included angle between the guide surface and the jet flow direction of the cooling medium sprayed by the oil injection hole is obtuse.

[0013] By adopting the technical scheme, the oil blocking ring plate guides the cooling medium sprayed from the oil injection hole to the cross-over and overlapping part of the stator winding end part, so as to improve the cooling effect of the stator winding.

[0014] Preferably, each of the oil blocking ring plates is provided with a weight-reducing structure on the side wall away from the stator core.

[0015] By adopting the technical scheme, the weight-reducing structure reduces the weight and material consumption of the oil blocking ring plate, and reduces the overall weight of the motor, thereby saving the cost.

[0016] Preferably, the circumferential distribution channel is arranged on the inner circumferential wall of the casing and extends along the width direction of the stator core, and the oil injection hole is arranged on the inner side wall of the casing.

[0017] By adopting the technical scheme, the circumferential distribution channel and the oil injection hole are arranged on the inner circumferential wall of the casing, which reduces the processing requirement of the outer circumferential wall of the stator core, greatly reduces the type of stamping sheet constituting the stator core, and reduces the manufacturing cost of the overall motor, thereby simplifying the processing cost of the overall oil cooling structure. In addition, the circumferential distribution pipe extending along the width direction of the stator core increases the contact area between the cooling medium inside the circumferential distribution pipe and the stator core, thereby improving the cooling effect of the cooling medium on the stator core.

[0018] Preferably, the circumferential distribution channel is arranged on the inner circumferential wall of the casing, the end distribution channel is arranged on the inner side wall of the casing around the stator core, the end distribution channel is oppositely distributed on both sides of the circumferential distribution channel, each of the end distribution channels is in communication with all the distribution grooves, and the oil injection hole is arranged on the inner side wall of the end distribution channel opposite to the circumferential distribution channel.

[0019] By adopting the technical scheme, the end distribution channel cooperates with the circumferential distribution channel to increase the contact area between the cooling medium between the casing and the stator core and the outer surface of the stator core, thereby improving the cooling effect of the cooling medium on the stator core. In addition, the end distribution channel reduces the requirement of the circumferential distribution channel extending along the width direction of the stator core, further reducing the processing difficulty and cost of the casing.

[0020] Preferably, the oil blocking member comprises an oil blocking groove, the oil blocking groove is arranged at both ends of the length direction of the casing, the inside of each of the oil blocking grooves is in communication with the end of the oil injection hole away from the stator core, and the side wall of each of the oil blocking grooves opposite to the oil injection hole is inclined to the direction away from the stator core, so that the included angle between the side wall of each of the oil blocking grooves opposite to the oil injection hole and the jet flow direction of the cooling medium sprayed from the oil injection hole is obtuse.

[0021] By adopting the technical scheme, the oil baffle is directly arranged in the machine shell to serve as the oil blocking piece, so that the oil blocking piece is integrally formed with the machine shell, the connection stability of the overall structure is improved, and the cost and materials for separately processing the oil blocking piece are reduced, thereby saving the cost.

[0022] Preferably, the side wall of the oil blocking piece facing the stator core is provided with a plurality of groups of oil blocking ribs, and all the oil blocking ribs are spaced along the circumference of the oil blocking piece.

[0023] By adopting the technical scheme, the oil blocking ribs reduce the free flow phenomenon of the cooling medium along the circumference of the motor, thereby improving the uniformity of the cooling of the motor by the cooling medium.

[0024] Preferably, the inner circumferential wall of the oil blocking piece is provided with a plurality of groups of flow guiding blocks, all the flow guiding blocks are spaced along the circumference of the oil blocking piece, and each flow guiding block is used for guiding the cooling medium to flow to the cross-overlapping part of the stator winding end portion.

[0025] By adopting the technical scheme, the flow guiding blocks guide the cooling medium on the oil blocking piece to flow to the cross-overlapping part of the stator winding end portion, thereby improving the accuracy of the spray cooling of the stator winding end portion, and further improving the cooling effect of the motor.

[0026] Preferably, the oil blocking piece comprises an oil guiding ring pipe, a butt joint pipe and an oil nozzle; the inner circumferential wall of each of the two ends of the machine shell in the length direction is provided with a mounting ring groove, and the mounting ring groove is in communication with the end of the oil injection hole away from the circumferential flow divider; the oil guiding ring pipe is arranged in the mounting ring groove, the butt joint pipe is arranged in the side wall of the oil guiding ring pipe facing the stator core in communication, the butt joint pipe and the oil injection hole are arranged one by one in correspondence, and each butt joint pipe is arranged in the corresponding oil injection hole; the oil nozzle is arranged on the inner circumferential wall of the oil guiding ring pipe, and the oil nozzle is spaced along the circumference of the oil guiding ring pipe.

[0027] By adopting the technical scheme, the butt joint pipe guides the cooling medium in the oil injection hole into the oil guiding ring pipe, the cooling medium in the oil guiding ring pipe precisely sprays and cools the cross-overlapping part of the stator winding end portion through the oil nozzle, the phenomenon of random splashing of the cooling medium ejected from the oil injection hole is reduced, and the accuracy of the spray cooling of the stator winding end portion is further improved.

[0028] In summary, the present application has at least one of the following beneficial technical effects:

[0029] The circumferential shunt and the shunt groove are arranged to facilitate the cooling medium introduced into the shell to cool the stator core; the cooling medium filled in the shunt groove is sprayed out through the oil injection hole and collides with the oil blocking piece to guide the cooling medium to change direction and accurately spray the cross-overlapping part of the stator winding end part, thus simplifying the overall oil cooling structure and improving the oil cooling effect of the motor;

[0030] The oil blocking rib is arranged to reduce the free flow of the cooling medium along the circumference of the motor, thereby improving the uniformity of the cooling medium in cooling the motor;

[0031] The flow guide block is arranged to guide the cooling medium on the oil blocking piece to the cross-overlapping part of the stator winding end part, thereby improving the accuracy of spraying and cooling the stator winding end part and improving the cooling effect of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structure schematic diagram of an oil-cooled motor stator with an oil blocking structure and a motor according to Embodiment 1 of the present application.

[0033] Figure 2 is an enlarged schematic diagram of the structure at A in Figure 1

[0034] Figure 3 is a structure schematic diagram of a stator core according to Embodiment 1 of the present application.

[0035] Figure 4 is a cross-sectional schematic diagram of the connection relationship between the shell and the stator core according to Embodiment 2 of the present application.

[0036] Figure 5 is a cross-sectional schematic diagram of the zigzag circumferential shunt inside the shell according to Embodiment 2 of the present application.

[0037] Figure 6 is a cross-sectional schematic diagram of the spiral circumferential shunt inside the shell according to Embodiment 2 of the present application.

[0038] Figure 7 is a cross-sectional schematic diagram of the internal structure of the shell according to Embodiment 3 of the present application.

[0039] Figure 8 is a cross-sectional schematic diagram of the connection relationship between the shell and the stator core according to Embodiment 4 of the present application.

[0040] REFERENCE SIGNS:

[0041] ​1, housing; 11, casing; 111, oil inlet hole; 112, oil outlet hole; 113, end part flow channel; 114, mounting ring groove; 12, end cover; 2, stator core; 21, stator winding; 22, shunt groove; 3, circumferential shunt channel; 4, oil injection hole; 5, oil blocking piece; 501, oil blocking rib; 502, drainage block; 51, oil blocking ring plate; 511, guide surface; 512, weight reduction structure; 52, oil blocking groove; 53, oil guide ring tube; 54, butt joint tube; 55, oil injection nozzle. DETAILED DESCRIPTION

[0042] The following description will be made in conjunction with the accompanying drawings. Figures 1-8 The present application is further described in detail.

[0043] Example 1

[0044] The present application discloses an oil-cooled motor stator with an oil blocking structure and a motor for simplifying the oil-cooled structure of the motor stator and efficiently cooling the motor stator.

[0045] Referring to Figure 1 and Figure 2 , an oil-cooled motor stator with an oil blocking structure and a motor include a housing 1 and a stator core 2 fixedly installed inside the housing 1, and the stator core 2 has a stator winding 21 installed inside. The housing 1 includes a casing 11 that encloses the stator core 2 and an end cover 12 fixedly installed on the open end of the casing 11 by screws. The top of the casing 11 is provided with an oil inlet hole 111 for introducing the cooled cooling medium into the inside of the casing 11, and the bottom of the casing 11 is recessed in a direction away from the oil inlet hole 111 to form a collection groove body for collecting the cooling medium inside the casing 11, and the bottom wall of the collection groove body is provided with an oil outlet hole 112 for discharging the cooling medium inside the casing 11.

[0046] Referring to Figure 2 and Figure 3 , the inner circumferential wall of the casing 11 and the outer circumferential wall of the stator core 2 together form a circumferential shunt channel 3, and the circumferential shunt channel 3 is in communication with the inside of the oil inlet hole 111 and the oil outlet hole 112. In this embodiment, the circumferential shunt channel 3 is formed on the outer circumferential wall of the stator core 2, and the circumferential shunt channel 3 extends along the circumference of the stator core 2 to form a ring shape.

[0047] Referring to Figure 2 and Figure 3 , the outer circumferential wall of the stator core 2 is provided with a plurality of groups of shunt grooves 22 spaced apart along the circumference of the stator core 2, all the shunt grooves 22 are provided along the axial direction of the stator core 2, and each group of shunt grooves 22 is in communication with the circumferential shunt channel 3, so that the cooling medium introduced into the inside of the casing 11 flows and conducts heat on the outer circumferential wall of the stator core 2 through the shunt grooves 22 and the circumferential shunt channel 3.

[0048] With reference to Figure 2 and Figure 3 , the side walls on both sides of the stator core 2 in the thickness direction are each provided with an oil injection channel 4, and all the oil injection channels 4 are distributed along the circumference of the stator core 2. The oil injection channel 4 is arranged corresponding to the flow distribution groove 22, and each group of oil injection channels 4 is connected to the inside of the corresponding flow distribution groove 22 at the end of the circumferential flow distribution channel 3, so as to inject the cooling medium passing through the outer surface of the stator core 2.

[0049] With reference to Figure 2 and Figure 3 , an oil blocking piece 5 is installed in the shell 1, and in this embodiment, the oil blocking piece 5 includes an oil blocking ring plate 51. The oil blocking ring plate 51 is fixedly installed on the inner circumferential wall of the shell 11 and the end cover 12. Specifically, the oil blocking ring plate 51 can be fixedly connected to the inner circumferential wall of the shell 1 by interference fit, or the oil blocking ring plate 51 can be glued to the inner circumferential wall of the shell 1 by using adhesive materials such as glue.

[0050] With reference to Figure 2 and Figure 3 , the stator core 2 is located between the two groups of oil blocking ring plates 51, and each group of oil blocking ring plates 51 extends along the circumference of the stator core 2. Each group of oil blocking ring plates 51 is provided with a guide surface 511 facing the side wall of the stator core 2, and each group of guide surfaces 511 is inclined to form a guide surface 511 facing away from the stator core 2, so that the included angle between the guide surface 511 and the jet direction of the cooling medium injected by each group of oil injection channels 4 is obtuse, thereby guiding the flow of the cooling medium injected by each group of oil injection channels 4 to the overlapping position of the end of the stator winding 21.

[0051] With reference to Figure 2 and Figure 3 , the side wall of each group of oil blocking ring plates 51 away from the stator core 2 is provided with a weight reduction structure 512, and in this embodiment, the weight reduction structure 512 can be a groove recessed in the side wall of the oil blocking ring plate 51 towards the stator core, or a bevel.

[0052] With reference to Figure 2 and Figure 3 , the side wall of the oil blocking ring plate 51 facing the stator core 2 is integrally formed with a plurality of groups of oil blocking ribs 501, and in this embodiment, the oil blocking ribs 501 can be various shapes, such as plate-shaped, trapezoidal, arc-shaped, rectangular, circular, and special-shaped, which can be selected according to actual needs, and no specific requirements are made here. All the oil blocking ribs 501 are distributed along the circumference of the oil blocking ring plate 51, so as to hinder the free flow of the cooling medium along the circumference of the motor, thereby improving the uniformity of the cooling medium for the motor.

[0053] With reference to Figure 2 and Figure 3The inner circumferential wall of the oil baffle plate 51 is integrally formed with a plurality of groups of drainage blocks 502. In this embodiment, the shape of the drainage blocks 502 can be a water droplet shape, a spherical shape, a circular shape, a wedge shape, a triangular shape, a pyramid shape, a bullet head shape, or a wave shape, which is selected according to actual requirements, and no specific requirements are made here. All the drainage blocks 502 are spaced apart along the circumferential direction of the oil baffle plate 51, and the end of each group of drainage blocks 502 away from the oil baffle plate 51 faces the stator winding 21, so that each group of drainage blocks 502 guides the cooling medium on the oil baffle plate 51 to flow to the cross-overlapping position at the end of the stator winding 21.

[0054] The implementation principle of the oil-cooled motor with an oil blocking structure according to the embodiment of the present application is as follows:

[0055] The cooled cooling medium is introduced into the circumferential distribution channel 3 between the motor casing 11 and the positioning iron core through the oil inlet hole 111, and the cooling medium in the circumferential distribution channel 3 exchanges heat with the outer circumferential wall of the stator iron core 2 through the distribution groove 22, so as to cool the stator iron core 2.

[0056] The cooling medium in the circumferential distribution channel 3 and the distribution groove 22 is sprayed out through the oil injection hole 4, and the sprayed cooling medium collides with the oil baffle plate 51. The oil baffle plate 51 guides the cooling medium to spray the cross-overlapping position at the end of the stator winding 21, so as to accurately spray and cool the cross-overlapping position at the end of the stator winding 21. The overall oil cooling structure is very simple, and the oil cooling effect of the motor is improved.

[0057] Embodiment 2:

[0058] The difference between Embodiment 2 and Embodiment 1 is that, referring to Figure 4 , Figure 5 and Figure 6 , the circumferential distribution channel 3 is arranged on the inner circumferential wall of the motor casing 11, and the circumferential distribution channel 3 extends along the width direction of the stator iron core 2. In this embodiment, the circumferential distribution channel 3 formed between the motor casing 11 and the stator iron core 2 can be a zigzag channel or a spiral channel, so as to increase the contact area of the cooling medium in the circumferential distribution channel 3 and the outer circumferential wall of the stator iron core 2.

[0059] Referring to Figure 4 and Figure 5 , in this embodiment, the oil blocking member 5 includes an oil blocking groove 52, the oil blocking groove 52 is arranged at the length direction of the motor casing 11, the oil blocking groove 52 is located at the width direction of the stator iron core 2, and each group of oil blocking grooves 52 extends along the circumferential direction of the stator iron core 2.

[0060] Referring to Figure 4 and Figure 5The oil injection hole 4 is arranged on the inner side wall of each group of oil retaining groove 52, all the oil injection holes 4 are distributed along the circumference of the oil retaining groove 52, and each group of oil injection hole 4 is connected with the inside of the circumferential distribution channel 3 at the end of the stator core 2, so that the cooling medium in the circumferential distribution channel 3 is injected into the oil retaining groove 52 through the oil injection hole 4.

[0061] With reference to Figure 1 , Figure 4 and Figure 5 , the side wall of each group of oil retaining groove 52 opposite to the oil injection hole 4 is arranged in a direction away from the stator core 2, and the angle between the side wall of each group of oil retaining groove 52 opposite to the oil injection hole 4 and the jet direction of the cooling medium injected from the oil injection hole 4 is obtuse, so that the cooling medium passing through the oil retaining groove 52 is guided to the cross-over position of the end of the stator winding 21 for accurate spraying.

[0062] With reference to Figure 4 and Figure 5 , in this embodiment, all the oil retaining ribs 501 are located inside the oil retaining groove 52, and all the oil retaining ribs 501 are distributed along the circumference of the oil retaining ring plate 51.

[0063] Embodiment 3:

[0064] The difference between embodiment 3 and embodiment 2 is that, with reference to Figure 7 , the circumferential distribution channel 3 is annularly arranged on the inner circumferential wall of the casing 11, and the circumferential distribution channel 3 is connected with the oil inlet hole 111 and the inside of all the distribution grooves 22. The end distribution channel 113 is arranged on the inner circumferential wall of the casing 11 along the circumference of the casing 11, and the end distribution channel 113 is oppositely distributed on both sides of the circumferential distribution channel 3. The inside of each group of end distribution channel 113 is connected with all the distribution grooves 22, so that the cooling medium in the circumferential distribution channel 3 and the distribution groove 22 flows into the inside of the end distribution channel 113. In addition, the end of each group of oil injection hole 4 is connected with the inside of the end distribution channel 113, so that the cooling medium in the end distribution channel 113 is injected through the oil injection hole 4.

[0065] Embodiment 4:

[0066] The difference between embodiment 4 and other embodiments is that, with reference to Figure 1 and Figure 8 , the oil retaining member 5 comprises an oil guiding ring pipe 53, a butt joint pipe 54 and an oil injection nozzle 55; the inner circumferential wall of both ends of the casing 11 is provided with an installation ring groove 114, the installation ring groove 114 is annularly arranged along the circumference of the casing 11, and the inside of each group of installation ring groove 114 is connected with the end of the oil injection hole 4 away from the circumferential distribution channel 3.

[0067] With reference to Figure 1 andFigure 8 The oil guide ring tube 53 is fixedly glued and inlaid inside each set of the mounting ring groove 114, and the butt joint tube 54 is fixedly communicated with the side wall of each set of the oil guide ring tube 53 towards the stator core 2. In the embodiment, the butt joint tube 54 is arranged one by one corresponding to the oil injection hole 4, and the end of each set of the butt joint tube 54 away from the oil guide ring tube 53 is inserted into the corresponding oil injection hole 4. The outer circumferential wall of each set of the butt joint tube 54 is tightly connected with the inner circumferential wall of the corresponding oil injection hole 4, and the inside of each set of the butt joint tube 54 is communicated with the inside of the corresponding oil injection hole 4, so that the cooling medium is guided into the inside of the oil guide ring tube 53 by the oil injection hole 4 through the butt joint tube 54. The oil injection nozzle 55 is fixedly communicated with the inner circumferential wall of the oil guide ring tube 53, all the oil injection nozzles 55 are spaced along the circumferential direction of the oil guide ring tube 53, and each set of the oil injection nozzle 55 is towards the end of the stator winding 21.

[0068] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A motor with an oil-cooled stator and an oil-blocking structure, comprising a housing (1) and a stator core (2) disposed inside the housing (1), wherein a stator winding (21) is wound inside the stator core (2); characterized in that: The housing (1) includes a casing (11) covering the stator core (2) and an end cap (12) disposed at the end of the casing (11); an oil inlet (111) is provided through the top of the casing (11), and an oil outlet (112) is provided through the bottom of the casing (11); a circumferential flow channel (3) is provided between the inner peripheral wall of the casing (11) and the outer peripheral wall of the stator core (2) and communicates with the oil inlet (111) and the oil outlet (112), and the circumferential flow channel (3) extends along the circumference of the stator core (2); the outer peripheral wall of the stator core (2) extends along the circumference of the stator core (2). (2) has several sets of diversion grooves (22) connected to the circumferential diversion channel (3) in the axial direction, and the diversion grooves (22) are arranged at intervals along the circumferential direction of the stator core (2); several sets of oil injection channels (4) connected to the circumferential diversion channel (3) are opened on both sides of the width direction of the circumferential diversion channel (3); oil baffles (5) are provided on the inner circumferential wall of the housing (1), and the oil baffles (5) are arranged along the circumferential direction of the stator core (2). The oil baffles (5) are used to guide the cooling medium sprayed from each set of oil injection channels (4) to the cross-overlapping part at the end of the stator winding (21); The oil baffle (5) includes an oil baffle groove (52), which is opened at both ends of the length direction of the housing (11). The interior of each oil baffle groove (52) is connected to the end of the oil injection channel (4) away from the stator core (2). The side wall of each oil baffle groove (52) facing the oil injection channel (4) is inclined in the direction away from the stator core (2) so that the angle between the side wall of each oil baffle groove (52) facing the oil injection channel (4) and the spray direction of the cooling medium sprayed from the oil injection channel (4) is an obtuse angle.

2. The motor with an oil-cooled stator and an oil-blocking structure according to claim 1, characterized in that: The oil injection channel (4) is opened on the end wall of the stator core (2). The oil injection channel (4) and the diversion groove (22) are respectively arranged in a one-to-one correspondence, and each oil injection channel (4) is connected to the interior of the corresponding diversion groove (22).

3. The motor with an oil-cooled stator and an oil-blocking structure according to claim 2, characterized in that: The oil baffle (5) includes an oil baffle ring (51); the oil baffle ring (51) is disposed on the inner peripheral wall of the housing (11) and the end cover (12), and the oil baffle ring (51) is located on both sides of the stator core (2) in the width direction. Each oil baffle ring (51) has a guide surface (511) on the side wall facing the stator core (2), and the angle between the guide surface (511) and the spray direction of the cooling medium sprayed from the oil injection channel (4) is an obtuse angle.

4. The motor with an oil-cooled stator and an oil-blocking structure according to claim 3, characterized in that: Each of the oil baffle rings (51) has a weight reduction structure (512) on its side wall away from the stator core (2).

5. The motor with an oil-cooled stator and an oil-blocking structure according to claim 1, characterized in that: The circumferential flow channel (3) is opened on the inner circumferential wall of the housing (11). The circumferential flow channel (3) extends along the width direction of the stator core (2), and the oil injection channel (4) is opened on the inner side wall of the housing (11).

6. The motor with an oil-cooled stator and an oil-blocking structure according to claim 1, characterized in that: The circumferential flow channel (3) is opened on the inner circumferential wall of the housing (11). The inner side wall of the housing (11) is provided with end flow channels (113) around the stator core (2). The end flow channels (113) are distributed on both sides of the circumferential flow channel (3). Each end flow channel (113) is connected to all the flow channels (22). The oil injection channels (4) are all opened on the inner side wall of the end flow channel (113) directly opposite the circumferential flow channel (3).

7. A motor with an oil-cooled stator and an oil-blocking structure according to any one of claims 1-6, characterized in that: The oil baffle (5) has several sets of oil baffle ribs (501) on the side wall facing the stator core (2), and all the oil baffle ribs (501) are distributed at intervals along the circumference of the oil baffle (5).

8. A motor with an oil-cooled stator and an oil-blocking structure according to any one of claims 1-6, characterized in that: The inner circumferential wall of the oil baffle (5) is provided with a number of groups of flow guide blocks (502). All the flow guide blocks (502) are distributed at intervals along the circumference of the oil baffle (5). Each flow guide block (502) is used to guide the cooling medium to the overlapping part at the end of the stator winding (21).

9. A motor with an oil-cooled motor stator having an oil-blocking structure according to any one of claims 2, 5, and 6, characterized in that: The oil baffle (5) includes an oil guide ring pipe (53), a connecting pipe (54), and an oil injector (55); the inner peripheral walls at both ends of the housing (11) in the length direction are provided with mounting ring grooves (114), and the interior of the mounting ring grooves (114) is connected to the end of the oil injection channel (4) away from the circumferential diversion channel (3); the oil guide ring pipe (53) is disposed inside the mounting ring groove (114), and the connecting pipe (54) is connected to the side wall of the oil guide ring pipe (53) facing the stator core (2). The connecting pipe (54) and the oil injection channel (4) are respectively provided one-to-one, and each connecting pipe (54) passes through the interior of the corresponding oil injection channel (4); the oil injector (55) is opened on the inner peripheral wall of the oil guide ring pipe (53), and the oil injector (55) is arranged at intervals along the circumference of the oil guide ring pipe (53).

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