Motor and motor assembling method

Abstract

The invention relates to the technical field of motors, and discloses a motor and a motor assembling method. According to the motor, after a stator core, a stator winding and two liquid storage rings are preliminarily assembled into a whole, a first part of pouring sealant is poured into each second groove, and the stator core, an inner ring of each liquid storage ring and the pouring sealant in each second groove are connected into a whole by adopting a second part of pouring sealant; and then the first part pouring sealant and the second part pouring sealant are cured, the first part pouring sealant poured in each second groove is cured to form a liquid blocking strip, and the second part pouring sealant is cured to form two liquid blocking ring bodies, so that the liquid blocking rings are integrally formed on the stator iron core and the two liquid storage rings. The liquid cooling effect and efficiency of the stator structure can be improved, the assembling efficiency of the motor is improved, the reliability of connecting the stator iron core and the two liquid storage rings is improved, the reliability of the notch of the sealing second groove is improved, the reliability of the gap between the inner ring of the sealing liquid storage ring and the stator iron core is improved, and the number of parts is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine and an electric machine assembling method. BACKGROUND

[0002] An electric drive system is a core component of a new energy vehicle, and an electric machine is a core component of the electric drive system. In related technologies, the cooling method for the electric machine mainly includes three modes of medium cooling, air cooling and natural cooling. Since the medium cooling can better cool the electric machine, the medium cooling mode is currently used to cool the electric machine.

[0003] For the medium cooling, in related technologies, a liquid cooling flow channel extending along an axial direction of the stator is usually arranged on the stator, a sealing strip is arranged at a stator slot opening of the stator or the stator is sleeved on an outer periphery of an oil separation ring, so as to improve the liquid cooling effect of the medium on the stator structure and the sealing effect of the medium. However, for the arrangement of the sealing strip at the stator slot opening of the stator, the number of parts is large, the assembling efficiency is low, and the sealing reliability needs to be improved. For the sleeving of the stator on the outer periphery of the oil separation ring, an additional sealing member needs to be arranged, which also leads to a complex structure, a low assembling efficiency, and a further improved sealing reliability. SUMMARY

[0004] The present application aims to provide an electric machine and an electric machine assembling method to solve the above problems of the electric machine in related technologies.

[0005] The present application provides an electric machine, comprising a stator structure, wherein the stator structure comprises:

[0006] a stator core, the stator core being provided with a central hole, at least two stator slots recessed in an inner peripheral wall of the central hole, and at least two liquid cooling flow channels; the central hole, each stator slot and each liquid cooling flow channel all pass through two axial end faces of the stator core along an axial direction of the stator core, at least two stator slots and at least two liquid cooling flow channels are spaced apart along a circumferential direction of the stator core, and at least two liquid cooling flow channels are located on an outer periphery of all stator slots; each stator slot comprises a first slot and a second slot connected in communication, the first slot is used for accommodating a stator winding, and the second slot is directly communicated with the central hole;

[0007] two liquid storage rings, the two liquid storage rings are one-to-one arranged at two axial ends of the stator core, each liquid storage ring forms a liquid storage cavity with the corresponding axial end face of the stator core, both ends of each liquid cooling flow channel are one-to-one communicated with the two liquid storage cavities, and the two liquid storage cavities are also used for accommodating the stator winding;

[0008] The liquid blocking ring comprises two liquid blocking ring bodies and at least two liquid blocking strips, the two liquid blocking ring bodies are arranged one by one corresponding to the two liquid storage rings, and the at least two liquid blocking strips are arranged one by one corresponding to the at least two second grooves; the liquid blocking strips are potting molded in the second grooves for sealing the grooves of the second grooves; the liquid blocking ring bodies are potting molded in the inner rings of the liquid storage rings, the axial end faces of the stator cores and all the liquid blocking strips, for sealing the gaps between the inner rings and the stator cores, and for connecting the liquid storage rings, the stator cores and all the liquid blocking strips into an integral whole.

[0009] As an optional solution of the above motor, the liquid blocking ring body comprises a first ring part and a second ring part connected with each other, the first ring part is potting molded in the inner circumferential wall of the inner ring, and the second ring part is potting molded between the inner ring and the axial end face of the stator core and connected with all the liquid blocking strips.

[0010] As an optional solution of the above motor, the inner diameter of the first ring part is equal to the hole diameter of the center hole; and / or,

[0011] the inner diameter of the second ring part is equal to the hole diameter of the center hole; and / or,

[0012] Each of the liquid blocking strips is completely located in the corresponding second groove.

[0013] As an optional solution of the above motor, the axial end face of each of the liquid blocking ring bodies away from the liquid blocking strips is a first axial end face, the axial end face of each of the liquid storage rings away from the stator core is a second axial end face, and the first axial end face of at least one of the liquid blocking ring bodies is coplanar with the corresponding second axial end face.

[0014] As an optional solution of the above motor, a first flow-through hole is formed between the outer ring of one of the liquid storage rings and the stator core, the first flow-through hole is directly communicated with the liquid storage cavity formed by the liquid storage ring; the outer ring of another of the liquid storage rings is provided with a second flow-through hole penetrating through the inner circumferential wall and the outer circumferential wall thereof; one of the first flow-through hole and the second flow-through hole is an inflow hole, and the other is an outflow hole.

[0015] As an optional solution of the above motor, the motor further comprises a machine shell, the machine shell is provided with a mounting cavity, and the stator structure is arranged in the mounting cavity; the machine shell is provided with a third flow-through hole penetrating through the inner circumferential wall of the mounting cavity, the first flow-through hole and the liquid cooling flow channel are both directly communicated with a first end of the third flow-through hole, and a second end of the third flow-through hole and the second flow-through hole are both used for being communicated with a cooling liquid source.

[0016] As an alternative to the above motor, the shell is further provided with a liquid supply cavity, the second end of the third flow-through hole and the second flow-through hole are in communication with the liquid supply cavity.

[0017] The cooling liquid in the liquid supply cavity is the cooling liquid source; or, the liquid supply cavity is in communication with the cooling liquid source.

[0018] As an alternative to the above motor, the inner circumferential wall of the mounting cavity forms a limiting surface, one of the liquid storage rings abuts against the limiting surface along the axial direction of the liquid storage ring.

[0019] As an alternative to the above motor, one of the liquid storage rings surrounding the first flow-through hole between the stator core is a first liquid storage ring, and the other is a second liquid storage ring.

[0020] A first sealing ring is arranged between the outer wall of the first liquid storage ring and the inner circumferential wall of the mounting cavity, and / or a second sealing ring is arranged between the outer ring of the second liquid storage ring and the stator core.

[0021] The present application also provides a motor assembly method for assembling the above motor, the motor assembly method comprising:

[0022] Fixing the relative positions of the stator core and the two liquid storage rings, so that the two liquid storage rings are located at the axial ends of the stator core one by one, and each liquid storage ring forms a liquid storage cavity between the corresponding axial end surface of the stator core;

[0023] Pouring a first part of potting glue into each second slot, and using a second part of potting glue to connect the stator core, the inner ring of each liquid storage ring and the potting glue in each second slot into an integral whole;

[0024] Curing the first part of potting glue and the second part of potting glue to form the liquid blocking ring, the liquid blocking ring being integrally formed on the stator core and the two liquid storage rings.

[0025] Advantages:

[0026] The application provides a motor and a motor assembling method. The motor comprises a stator structure, the stator structure comprises a stator core, a liquid blocking ring and two liquid storage rings; the stator core is provided with a central hole, at least two stator slots recessed in the inner circumferential wall of the central hole, and at least two liquid cooling channels; the central hole, each stator slot and each liquid cooling channel all pass through the two axial end surfaces of the stator core along the axial direction of the stator core; the at least two stator slots and the at least two liquid cooling channels are spaced apart along the circumferential direction of the stator core, and the at least two liquid cooling channels are located on the outer circumferences of all the stator slots; each stator slot comprises a first slot and a second slot connected in communication, the first slot is used for accommodating a stator winding, and the second slot is directly communicated with the central hole; the two liquid storage rings are arranged at the two axial ends of the stator core in one-to-one correspondence, each liquid storage ring forms a liquid storage cavity between the corresponding axial end surface of the stator core, and the two ends of each liquid cooling channel are in one-to-one correspondence with the two liquid storage cavities; the two liquid storage cavities are also used for accommodating the stator winding; the liquid blocking ring comprises two liquid blocking ring bodies and at least two liquid blocking strips formed integrally, the two liquid blocking ring bodies are arranged in one-to-one correspondence with the two liquid storage rings, and the at least two liquid blocking strips are arranged in one-to-one correspondence with the at least two second slots; the liquid blocking strip is potting formed in the slot opening of the second slot for sealing the slot opening; the liquid blocking ring body is potting formed in the inner ring of the liquid storage ring, the axial end surface of the stator core and all the liquid blocking strips, for sealing the gap between the inner ring of the liquid storage ring and the stator core, and for connecting the liquid storage ring, the stator core and all the liquid blocking strips into an integral whole.

[0027] The two liquid storage rings are arranged at the two axial ends of the stator core in one-to-one correspondence, each liquid storage ring forms a liquid storage cavity between the corresponding axial end surface of the stator core, and the two ends of each liquid cooling channel are in one-to-one correspondence with the two liquid storage cavities. It can be understood that a liquid cooling cavity in communication is formed between each liquid cooling channel and the two liquid storage cavities, the liquid storage cavity is used for accommodating the stator winding, so that the part of the stator winding located outside the two axial ends of the stator core can be substantially completely immersed in the cooling liquid in the liquid storage cavity, the contact area of the stator winding and the cooling liquid is increased, and the cooling liquid in each liquid cooling channel can simultaneously cool the stator core, thereby effectively improving the effect and efficiency of liquid cooling of the stator structure, and effectively improving the working performance and service life of the motor.

[0028] By setting the liquid blocking ring to include two integrally formed liquid blocking ring bodies and at least two liquid blocking strips, the liquid blocking strips are cast in the second grooves to seal the groove openings of the second grooves, the liquid blocking ring bodies are cast in the inner rings of the liquid storage rings, the axial end faces of the stator cores, and all the liquid blocking strips to seal the gaps between the inner rings of the liquid storage rings and the stator cores and to connect the liquid storage rings, the stator cores, and all the liquid blocking strips into an integral whole, specifically, after the stator cores, the stator windings, and the two liquid storage rings are initially assembled into an integral whole, a first part of the cast-in sealant is poured into each second groove, a second part of the cast-in sealant is used to connect the stator cores, the inner rings of each liquid storage ring, and the cast-in sealant in each second groove into an integral whole and to seal the gaps between the inner rings of the liquid storage rings and the stator cores, and then the first part of the cast-in sealant and the second part of the cast-in sealant are solidified to form the liquid blocking ring. It can be understood that the first part of the cast-in sealant solidified in each second groove forms the liquid blocking strips, and the second part of the cast-in sealant solidified forms the two liquid blocking ring bodies, so that the first part of the cast-in sealant and the second part of the cast-in sealant are solidified to form the liquid blocking ring, and the liquid blocking ring is integrally formed on the stator cores and the two liquid storage rings. Therefore, compared with the related art, the reliability of connecting the stator cores and the two liquid storage rings can be effectively improved, the reliability of sealing the groove openings of the second grooves can be effectively improved, the reliability of sealing the gaps between the inner rings of the liquid storage rings and the stator cores can be effectively improved, the risk of the cooling liquid leaking into the air gap formed between the stator structure and the rotor can be reduced, no additional sealing ring is needed, no additional structure limiting the relative positions of the stator cores and the two liquid storage rings is needed, and the number of parts can be effectively simplified.

[0029] Therefore, the effect and efficiency of liquid cooling of the stator structure can be improved, the reliability of connecting the stator cores and the two liquid storage rings can be effectively improved, the reliability of sealing the groove openings of the second grooves can be effectively improved, the reliability of sealing the gaps between the inner rings of the liquid storage rings and the stator cores can be effectively improved, no additional sealing ring is needed, no additional structure limiting the relative positions of the stator cores and the two liquid storage rings is needed, and the number of parts can be effectively simplified. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A cross-sectional view of the motor provided by the embodiment of the present application;

[0031] Figure 2 A structure schematic view of the stator core along a first viewing angle provided by the embodiment of the present application;

[0032] Figure 3 A structure schematic view of the stator core along a second viewing angle provided by the embodiment of the present application;

[0033] Figure 4 A structure schematic view of the liquid blocking ring provided by the embodiment of the present application;

[0034] Figure 5A structure schematic view of the first liquid storage ring provided by the embodiment of the present application is shown in the figure.

[0035] Figure 6 A structure schematic view of the second liquid storage ring provided by the embodiment of the present application is shown in the figure.

[0036] Figure 7 A structure schematic view of the casing along a third perspective provided by the embodiment of the present application is shown in the figure.

[0037] Figure 8 A structure schematic view of the casing along a fourth perspective provided by the embodiment of the present application is shown in the figure.

[0038] In the figure:

[0039] 1, stator core; 11, center hole; 12, stator slot; 121, first slot; 122, second slot; 13, liquid cooling flow channel; 14, tooth part; 15, first mounting lug; 151, first connecting hole;

[0040] 2, stator winding;

[0041] 3, liquid storage ring;

[0042] 31, first liquid storage ring; 311, first inner ring; 312, first outer ring; 3121, groove; 313, first connecting ring;

[0043] 32, second liquid storage ring; 321, second inner ring; 322, second outer ring; 3221, second flow-through hole; 323, second connecting ring; 324, reinforcing rib; 325, second mounting lug; 3251, third connecting hole;

[0044] 4, liquid blocking ring; 41, liquid blocking ring body; 411, first ring part; 412, second ring part; 42, liquid blocking strip;

[0045] 5, first flow-through hole;

[0046] 6, casing; 61, mounting cavity; 62, third flow-through hole; 63, liquid supply cavity; 64, limiting surface; 65, first mounting slot; 66, second connecting hole; 67, second mounting slot; 68, fourth connecting hole;

[0047] 71, first liquid storage cavity; 72, second liquid storage cavity;

[0048] 81, first sealing ring; 82, second sealing ring. DETAILED DESCRIPTION

[0049] The technical solutions of the present application will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "above" and "above" of the first feature on the second feature include the first feature above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The "below", "below" and "below" of the first feature on the second feature include the first feature below and obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0051] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0053] An electric drive system is a core component of a new energy vehicle, and a motor is a core component of the electric drive system. In the related art, the cooling mode of the motor mainly includes three modes of medium cooling, air cooling and natural cooling. Since the medium cooling can better cool the motor, the medium cooling mode is currently used to cool the motor. In view of the medium cooling, in the related art, a liquid cooling flow channel extending along an axial direction of the stator is usually arranged on the stator, a sealing strip is arranged at a stator slot opening of the stator, or the stator is sleeved on an outer periphery of an oil separation ring, so as to improve the liquid cooling effect of the medium on the stator structure and the sealing effect of the medium. However, for the arrangement of the sealing strip at the stator slot opening of the stator, the number of parts is large, the assembly efficiency is low, and the sealing reliability needs to be improved; for the arrangement of the stator on the outer periphery of the oil separation ring, an additional sealing member needs to be arranged, which also leads to a complex structure, low assembly efficiency, and further improvement of the sealing reliability.

[0054] The present application provides a motor, such as Figures 1-6 As shown in the figure, the motor comprises a stator structure, the stator structure comprising a stator core 1, a liquid blocking ring 4 and two liquid storage rings 3. The stator core 1 is provided with a central hole 11, at least two stator slots 12 recessed in the inner peripheral wall of the central hole 11, and at least two liquid cooling flow channels 13. The central hole 11, each stator slot 12 and each liquid cooling flow channel 13 all pass through the two axial end faces of the stator core 1 along the axial direction of the stator core 1. The at least two stator slots 12 and the at least two liquid cooling flow channels 13 are spaced apart along the circumferential direction of the stator core 1, and the at least two liquid cooling flow channels 13 are located on the outer periphery of all the stator slots 12. Each stator slot 12 comprises a first slot 121 and a second slot 122 connected in communication, the first slot 121 being used for accommodating a stator winding 2, and the second slot 122 being directly communicated with the central hole 11. The two liquid storage rings 3 are arranged one by one at the axial two ends of the stator core 1. Each liquid storage ring 3 forms a liquid storage cavity with the corresponding axial end face of the stator core 1. The two ends of each liquid cooling flow channel 13 are communicated one by one with the two liquid storage cavities, and the two liquid storage cavities are also used for accommodating the stator winding 2. The liquid blocking ring 4 comprises two integrally formed liquid blocking ring bodies 41 and at least two liquid blocking strips 42. The two liquid blocking ring bodies 41 are arranged one by one with the two liquid storage rings 3, and the at least two liquid blocking strips 42 are arranged one by one with the at least two second slots 122. The liquid blocking strip 42 is potting formed in the second slot 122 to seal the slot opening of the second slot 122. The liquid blocking ring body 41 is potting formed in the inner ring of the liquid storage ring 3, the axial end face of the stator core 1 and all the liquid blocking strips 42, used for sealing the gap between the inner ring of the liquid storage ring 3 and the stator core 1, and for connecting the liquid storage ring 3, the stator core 1 and all the liquid blocking strips 42 into an integral whole.

[0055] The motor sets two liquid storage rings 3 corresponding to the axial ends of the stator core 1, each liquid storage ring 3 forms a liquid storage cavity between the corresponding axial end face of the stator core 1, and the two ends of each liquid cooling channel 13 correspondingly communicate with the two liquid storage cavities. It can be understood that the liquid cooling cavity is formed between each liquid cooling channel 13 and the two liquid storage cavities. The liquid storage cavity is used to accommodate the stator winding 2, so that the part of the stator winding 2 located outside the axial ends of the stator core 1 can be substantially completely immersed in the cooling liquid in the liquid storage cavity, thereby increasing the contact area between the stator winding 2 and the cooling liquid, and the cooling liquid in each liquid cooling channel 13 can simultaneously liquid-cool the stator core 1, thereby effectively improving the effect and efficiency of liquid-cooling the stator structure, and effectively improving the working performance and service life of the motor.

[0056] By setting the liquid blocking ring 4 to include two liquid blocking ring bodies 41 and at least two liquid blocking strips 42 integrally formed, the liquid blocking strip 42 is injection molded in the second groove 122 to seal the groove opening of the second groove 122, and the liquid blocking ring body 41 is injection molded in the inner ring of the liquid storage ring 3, the axial end face of the stator core 1, and the plurality of liquid blocking strips 42, to seal the gap between the inner ring and the stator core 1, and to connect the liquid storage ring 3, the stator core 1, and all the liquid blocking strips 42 into a whole. Specifically, after the stator core 1, the stator winding 2, and the two liquid storage rings 3 are preliminarily assembled into a whole, a first part of the injection sealing glue is poured into each second groove 122, and a second part of the injection sealing glue is used to connect the stator core 1, the inner ring of each liquid storage ring 3, and the injection sealing glue in each second groove 122 into a whole, and to seal the gap between the inner ring of the liquid storage ring 3 and the stator core 1, and then the first part of the injection sealing glue and the second part of the injection sealing glue are solidified to form the liquid blocking ring 4. It can be understood that the first part of the injection sealing glue solidified in each second groove 122 forms the liquid blocking strip 42, and the second part of the injection sealing glue forms the two liquid blocking ring bodies 41, so that the first part of the injection sealing glue and the second part of the injection sealing glue are solidified to form the liquid blocking ring 4, and the liquid blocking ring 4 is integrally formed on the stator core 1 and the two liquid storage rings 3. Therefore, compared with the related art, the reliability of connecting the stator core 1 and the two liquid storage rings 3 can be effectively improved, the reliability of sealing the groove opening of the second groove 122 can be effectively improved, the reliability of sealing the gap between the inner ring of the liquid storage ring 3 and the stator core 1 can be effectively improved, the risk of cooling liquid leaking into the air gap formed between the stator structure and the rotor can be reduced, and there is no need to additionally set a sealing ring or a structure for limiting the relative position of the stator core 1 and the two liquid storage rings 3, thereby effectively simplifying the number of parts.

[0057] Therefore, it can not only improve the effect and efficiency of liquid cooling of the stator structure, but also improve the reliability of connecting the stator core 1 and the two liquid storage rings 3 while improving assembly efficiency, effectively improve the reliability of sealing the groove opening of the second groove 122, and effectively improve the reliability of sealing the gap between the inner ring of the liquid storage ring 3 and the stator core 1. Moreover, it does not require additional sealing rings or structures that limit the relative position of the stator core 1 and the two liquid storage rings 3, which can effectively simplify the number of parts.

[0058] In this embodiment, the coolant is exemplarily set to be oil.

[0059] Specifically, the center hole 11 is used to mount the rotor of the motor. The central axis of the center hole 11 is collinear with the central axis of the stator core 1. The specific structures of the rotor and stator winding 2 are existing technologies and will not be described in detail here.

[0060] Specifically, the air gap refers to the gap formed between the stator structure and the rotor.

[0061] It is understandable that, such as Figure 1 As shown, after the stator structure is assembled, the axial directions of the stator core 1, the liquid storage ring 3, the liquid baffle ring 4, the liquid baffle ring body 41, and the length direction of the liquid baffle strip 42 are all parallel.

[0062] Specifically, such as Figures 1-3 As shown, along the circumferential direction of the stator core 1, teeth 14 are formed between any two adjacent stator slots 12 of the stator core 1. The teeth 14 include first sub-teeth formed between two adjacent first slots 121 and second sub-teeth formed between two adjacent second slots 122.

[0063] Specifically, the potting process refers to filling the gap between two structures by pressure injection of materials such as epoxy resin or silicone, followed by curing. In this embodiment, as... Figures 1-3 As shown, for filling the second groove 122 with the first portion of potting compound, the two structures refer to the adjacent end faces on the second sub-teeth of any two adjacent teeth 14; as Figure 1 , Figure 5 and Figure 6 As shown, for the second part of the potting compound, the two structures refer to the stator core 1 and the liquid storage ring 3. Preferably, before potting, debris on the two structures is removed and vacuum dried. During potting, the viscosity and injection pressure of the potting compound are controlled. After potting, the adhesion effect of the potting compound is tested to further ensure the connection reliability and sealing reliability of the molded liquid-retaining ring 4.

[0064] Optionally, in this embodiment, as Figure 1 and Figure 4As shown, the liquid-blocking ring 41 includes a first ring portion 411 and a second ring portion 412 connected to each other. The first ring portion 411 is potted and formed on the inner circumferential wall of the inner ring, and the second ring portion 412 is potted and formed between the inner ring and the axial end face of the stator core 1 and is connected to all the liquid-blocking strips 42. The liquid-blocking ring 41 is formed by potting and molding the liquid-blocking ring 41 onto the inner ring of the liquid storage ring 3, the axial end face of the stator core 1, and all the liquid-blocking strips 42. The liquid-blocking ring 41 can effectively seal the gap between the inner ring of the liquid storage ring 3 and the stator core 1, and can effectively connect the liquid storage ring 3, the stator core 1, and all the liquid-blocking strips 42 into a whole. Secondly, by potting and molding the first ring portion 411 onto the inner circumferential wall of the inner ring, the connection area between the liquid-blocking ring 41 and the liquid storage ring 3 can be increased, thereby further improving the reliability of sealing the gap between the inner ring of the liquid storage ring 3 and the stator core 1, and further improving the reliability of connecting the liquid storage ring 3, the stator core 1, and all the liquid-blocking strips 42 into a whole.

[0065] In other embodiments, the liquid-blocking ring 41 may be configured to include only the second ring portion 412, which is potted and formed between the inner ring and the axial end face of the stator core 1 and connected to all the liquid-blocking strips 42.

[0066] Optionally, such as Figure 1 As shown, the axial end face away from the liquid-blocking strip 42 on each liquid-blocking ring 41 is the first axial end face, and the axial end face away from the stator core 1 on each liquid-retaining ring 3 is the second axial end face. The first axial end face of at least one liquid-blocking ring 41 is coplanar with the corresponding second axial end face. This further increases the connection area between the liquid-blocking ring 41 and the liquid-retaining ring 3 along the axial direction of the stator core 1, thereby further improving the reliability of sealing the gap between the inner ring of the liquid-retaining ring 3 and the stator core 1, and further improving the reliability of connecting the liquid-retaining ring 3, the stator core 1, and all liquid-blocking strips 42 into a whole.

[0067] Optionally, in this embodiment, as Figure 1 As shown, the inner diameter of the first ring 411 is equal to the diameter of the central hole 11. This improves the reliability of the gap between the inner ring of the sealing liquid storage ring 3 and the stator core 1, and enhances the reliability of connecting the liquid storage ring 3, the stator core 1, and all the liquid baffles 42 into a whole. At the same time, it does not occupy the space of the central hole 11, leaving enough space to install the rotor, thereby further improving the working performance of the resulting motor.

[0068] In other embodiments, the inner diameter of the first ring portion 411 may be smaller or larger than the diameter of the central hole 11.

[0069] Optionally, in this embodiment, as Figure 1As shown, the inner diameter of the second ring part 412 is equal to the hole diameter of the center hole 11. Further, on the basis of improving the reliability of the gap between the inner ring of the seal liquid storage ring 3 and the stator core 1 and improving the reliability of connecting the liquid storage ring 3, the stator core 1 and all the liquid blocking strips 42 into an integral whole, the space of the center hole 11 is not occupied, there is enough space to install the rotor, so as to further improve the working performance of the formed motor.

[0070] In other embodiments, the inner diameter of the second ring part 412 can also be less than or greater than the hole diameter of the center hole 11.

[0071] Optionally, in the present embodiment, as shown in Figure 1 each liquid blocking strip 42 is completely located in the corresponding second groove 122. On the basis of improving the reliability of the gap of the second groove 122, the space of the center hole 11 is not occupied, there is enough space to install the rotor, so as to further improve the working performance of the formed motor. Therefore, the liquid blocking ring 4 of the present embodiment does not occupy the space of the center hole 11 at all, and the working performance of the formed motor can be further improved.

[0072] In other embodiments, at least part of the liquid blocking strip 42 can be located outside the corresponding second groove 122 along the radial direction of the stator core 1.

[0073] Optionally, as shown in Figure 1 , one of the first flow-through hole 5 between the outer ring of the liquid storage ring 3 and the stator core 1 and the second flow-through hole 3221 of the liquid storage ring 3 is an inlet hole, and the other is an outlet hole.

[0074] As shown in Figure 1 , Figure 5 and Figure 6 , the liquid storage ring 3 defining the first flow-through hole 5 is a first liquid storage ring 31, and the liquid storage ring 3 defining the second flow-through hole 3221 is a second liquid storage ring 32. The liquid storage cavity formed between the first liquid storage ring 31 and the axial end face of the stator core 1 adjacent to the first liquid storage ring 31 is a first liquid storage cavity 71, and the liquid storage cavity formed between the second liquid storage ring 32 and the axial end face of the stator core 1 adjacent to the second liquid storage ring 32 is a second liquid storage cavity 72.

[0075] In the present embodiment, as shown in Figure 1As shown, the first flow-through hole 5 is an inlet flow hole and the second flow-through hole 3221 is an outlet flow hole. Correspondingly, the first liquid storage cavity 71 is an inlet liquid cavity and the second liquid storage cavity 72 is an outlet liquid cavity. The cooling liquid is delivered into the first liquid storage cavity 71 through the first flow-through hole 5, and then flows through the first liquid storage cavity 71, the liquid cooling channel 13 and the second liquid storage cavity 72 in sequence, and finally flows out of the second flow-through hole 3221. In this way, the cooling liquid in the liquid cooling chamber is flowing cooling liquid, which can further improve the effect and efficiency of liquid cooling on the stator winding 2 and the stator core 1, and further improve the working performance and service life of the motor.

[0076] In other embodiments, the first flow-through hole 5 can also be an outlet liquid hole, and the second flow-through hole 3221 can be an inlet liquid hole.

[0077] In other embodiments, a hole through the inner and outer circumferential walls of the first liquid storage ring 31 can be directly formed on the outer ring of the first liquid storage ring 31 as the first flow-through hole 5, and a hole through the inner and outer circumferential walls of the second liquid storage ring 32 can be formed on the second liquid storage ring 32 as the second flow-through hole 3221. One of the first flow-through hole 5 and the second flow-through hole 3221 is an inlet liquid hole, and the other is an outlet liquid hole.

[0078] Specifically, in the present embodiment, as shown in Figure 1 and Figure 5 , the inner ring of the first liquid storage ring 31 is a first inner ring 311, the outer ring of the first liquid storage ring 31 is a first outer ring 312, and the first liquid storage ring 31 further includes a first connecting ring 313 connecting the first inner ring 311 and the first outer ring 312. The first inner ring 311, the first outer ring 312 and the first connecting ring 313 form a first liquid storage groove therebetween, and the first liquid storage groove forms a first liquid storage cavity 71 between the inner wall of the first liquid storage groove and the axial end face of the stator core 1 adjacent to the first liquid storage ring 31. Further, the axial end face of the first outer ring 312 away from the first connecting ring 313 is recessed with a recess 3121, and the recess 3121 forms a first flow-through hole 5 between the recess 3121 and the axial end face of the stator core 1 adjacent to the first liquid storage ring 31.

[0079] Further optionally, as shown in Figure 5 , the number of recesses 3121 is at least two, and the at least two recesses 3121 are distributed along the circumference of the first outer ring 312. This can improve the efficiency of the cooling liquid flowing into the first liquid storage cavity 71 through the first flow-through hole 5, thereby further improving the efficiency and effect of liquid cooling on the stator structure.

[0080] Further optionally, in the present embodiment, as shown in Figure 5As shown, at least two grooves 3121 are uniformly distributed along the circumference of the first outer ring 312. This enables the cooling liquid flowing into the first liquid storage cavity 71 to be roughly evenly divided into multiple streams and simultaneously flow into the first liquid storage cavity 71, so that the liquid cooling can be performed on the stator structure roughly evenly along the circumference of the stator core 1, thereby further improving the efficiency and effect of liquid cooling on the stator structure.

[0081] Further optionally, in the embodiment, the first inner ring 311, the first outer ring 312 and the first connecting ring 313 of the first liquid storage ring 31 are integrally formed. This improves the structural strength of the first liquid storage ring 31 and further reduces the number of parts. In other embodiments, the first inner ring 311, the first outer ring 312 and the first connecting ring 313 of the first liquid storage ring 31 can be sealingly connected by welding or the like.

[0082] Specifically, in the embodiment, as shown in Figure 1 and Figure 6 , the inner ring of the second liquid storage ring 32 is a second inner ring 321, the outer ring of the second liquid storage ring 32 is a second outer ring 322, and the second liquid storage ring 32 further includes a second connecting ring 323 connecting the second inner ring 321 and the second outer ring 322. The second inner ring 321, the second outer ring 322 and the second connecting ring 323 form a second liquid groove therebetween, and the inner wall of the second liquid groove and the axial end face of the stator core 1 adjacent to the second liquid storage ring 32 form a second liquid storage cavity 72. The second outer ring 322 is provided with a second flow-through hole 3221.

[0083] Optionally, as shown in Figure 6 , the number of second flow-through holes 3221 is at least two, and the at least two second flow-through holes 3221 are distributed on the second outer ring 322. This ensures the reliability of the cooling liquid flowing out of the second liquid storage cavity 72.

[0084] Further optionally, in the embodiment, the sum of the total flow-through cross-sectional areas of the at least two first flow-through holes 5 is greater than the sum of the total flow-through cross-sectional areas of the at least two second flow-through holes 3221. This enables the cooling liquid to be temporarily stored in the first liquid storage cavity 71, the second liquid storage cavity 72 and the liquid cooling flow channel 13, thereby further improving the efficiency and effect of liquid cooling on the stator structure.

[0085] Further optionally, in the embodiment, as shown in Figure 6 , the inner circumferential wall of the second inner ring 321 is provided with at least two reinforcing ribs 324, and the at least two reinforcing ribs 324 are distributed along the circumference of the second inner ring 321. This improves the structural strength of the second liquid storage ring 32. In other embodiments, the structural strength of the second liquid storage ring 32 can also be improved by thickening the thickness of the second inner ring 321, and / or thickening the thickness of the second outer ring 322, and / or thickening the thickness of the second connecting ring 323.

[0086] It can be understood that in the embodiment, the at least two reinforcing ribs 324 are integrally sealed with the corresponding first ring part 411. In order to avoid leakage of the cooling liquid from the gap between the reinforcing ribs 324 and the corresponding first ring part 411, the sealing reliability is further improved.

[0087] Further optionally, in the embodiment, the second inner ring 321, the second outer ring 322, the second connecting ring 323 and the at least two reinforcing ribs 324 of the second liquid storage ring 32 are integrally formed. In order to improve the structural strength of the second liquid storage ring 32, and further reduce the number of parts. In other embodiments, the second inner ring 321, the second outer ring 322 and the second connecting ring 323 of the second liquid storage ring 32 can be sealingly connected by welding or the like.

[0088] Further optionally, in the embodiment, as shown in Figure 1 , the first outer ring 312 is located between all the liquid cooling channels 13 and all the stator slots 12 along the radial direction of the stator core 1, and the second outer ring 322 is located at the outer periphery of all the liquid cooling channels 13. It can be understood that the two ends of the first flow-through hole 5 are in one-to-one correspondence with the first liquid storage cavity 71 and the liquid cooling channel 13. The efficiency of the cooling liquid flowing into the first liquid storage cavity 71 and each liquid cooling channel 13 can be further improved, thereby further improving the liquid cooling effect and efficiency of the stator winding 2 and the stator core 1, and further improving the working performance and service life of the motor.

[0089] In other embodiments, the first outer ring 312 can be located at the outer periphery of all the liquid cooling channels 13.

[0090] In other embodiments, for the first flow-through hole 5 being a liquid inlet hole and the second flow-through hole 3221 being a liquid outlet hole, the first liquid storage cavity 71 and the second liquid storage cavity 72 are in one-to-one correspondence with the two ends of each liquid cooling channel 13. The contact area between the cooling liquid and the stator core 1 can be further increased, thereby further improving the liquid cooling effect of the stator core 1.

[0091] In other embodiments, for the first flow-through hole 5 being a liquid inlet hole and the second flow-through hole 3221 being a liquid outlet hole, the first liquid storage cavity 71 and the second liquid storage cavity 72 are in one-to-one correspondence with the two ends of each liquid cooling channel 13. The contact area between the cooling liquid and the stator core 1 can be further increased, thereby further improving the liquid cooling effect of the stator core 1. Figure 1 、 Figure 7 and Figure 8 As shown in

[0092] Optionally, in the embodiment, as shown in Figure 1 and Figure 8As shown, the casing 6 is provided with a third flow-through hole 62 penetrating to the inner circumferential wall of the mounting cavity 61, the first flow-through hole 5 and the first end of the liquid cooling flow channel 13 are in direct communication with the first end of the third flow-through hole 62, and the second end of the third flow-through hole 62 and the second flow-through hole 3221 are both used for communication with the cooling liquid source. By synchronously delivering the cooling liquid to the first flow-through hole 5 and each liquid cooling flow channel 13 through the third flow-through hole 62, the cooling liquid is divided into two parts and flows to the first liquid storage cavity 71 and each liquid cooling flow channel 13, respectively. The cooling liquid is returned to the cooling liquid source through the second flow-through hole 3221, so that the cooling liquid can be reused, and the liquid cooling cost is reduced.

[0093] Further optionally, the number of the third flow-through holes 62 is at least two, and the at least two third flow-through holes 62 are spaced apart along the circumference of the casing 6. This can further improve the effect of delivering the cooling liquid, thereby further improving the efficiency and effect of liquid cooling of the stator structure.

[0094] Further optionally, in the embodiment, the at least two third flow-through holes 62 are spaced apart along the circumference of the stator structure. This can further improve the effect of liquid cooling of the stator structure at each part along the circumference of the stator core 1, thereby further improving the efficiency and effect of liquid cooling of the stator structure.

[0095] Optionally, as shown in Figure 1 , Figure 7 and Figure 8 , the casing 6 is further provided with a liquid supply cavity 63, and the second end of the third flow-through hole 62 and the second flow-through hole 3221 are both in communication with the liquid supply cavity 63; the cooling liquid in the liquid supply cavity 63 is the cooling liquid source; or, the liquid supply cavity 63 is in communication with the cooling liquid source. In the embodiment, the cooling liquid in the liquid supply cavity 63 is exemplarily set as the cooling liquid source. Further, the casing 6 is provided with a hydraulic pump, and the hydraulic pump is used to pump the cooling liquid in the liquid supply cavity 63 to the first liquid storage cavity 71 and each liquid cooling flow channel 13 through the third flow-through hole 62. This can stably, quickly and efficiently liquid cool the stator structure.

[0096] In other embodiments, the liquid supply cavity 63 is in communication with the cooling liquid source, and the cooling liquid source is relatively independently arranged outside the motor.

[0097] Optionally, as shown in Figure 1 , the motor further comprises a first sealing ring 81 for sealing the gap between the outer wall of the first liquid storage ring 31 and the inner circumferential wall of the mounting cavity 61. It can be understood that, in the embodiment, along the axial direction of the first liquid storage ring 31, the first sealing ring 81 is away from the stator core 1 relative to the first flow-through hole 5.

[0098] By setting the first sealing ring 81, the leakage of the cooling liquid from the gap between the inner wall of the mounting cavity 61 and the outer peripheral wall of the first outer ring 312 can be effectively avoided. In addition, since the liquid cooling flow channel 13 and the first liquid storage cavity 71 both need to be filled with cooling liquid, the above setting makes it unnecessary to set a sealing ring between the first outer ring 312 and the first axial end surface of the stator core 1, which can further simplify the structure and reduce the cost. In addition, compared with directly opening the first flow-through hole 5 on the first outer ring 312, the number of the first sealing ring 81 can be effectively reduced to reduce the cost and improve the sealing reliability.

[0099] Optionally, as shown in Figure 1 , the motor further includes a second sealing ring 82, and the second sealing ring 82 is used to seal the gap between the outer ring of the second liquid storage ring 32 and the stator core 1. That is, the gap between the second outer ring 322 and the stator core 1 is sealed.

[0100] In the embodiment, since the second outer ring 322 of the second liquid storage ring 32 is located at the outer periphery of all the liquid cooling flow channels 13 along the radial direction of the stator core 1, the second sealing ring 82 is only arranged between the second outer ring 322 and the stator core 1, so that the second liquid storage cavity 72 can be sealed and the leakage of the cooling liquid from the gap between the second outer ring 322 and the stator core 1 can be avoided.

[0101] In other embodiments, the second sealing ring 82 can also be arranged between the second outer ring 322 and the stator core 1, and a third sealing ring can be arranged between the second inner ring 321 and the stator core 1. In this way, the reliability of sealing the second liquid storage cavity 72 can be further improved.

[0102] Optionally, as shown in Figure 8 , the inner peripheral wall of the mounting cavity 61 forms a limiting surface 64, and one of the liquid storage rings 3 abuts against the limiting surface 64 along the axial direction of the liquid storage ring 3. In this way, the setting position of the stator structure in the mounting cavity 61 along the axial direction of the stator core 1 is limited, and the stator core 1 can be conveniently fixed in the casing 6. In the embodiment, as shown in Figure 1 and Figure 8 , the first connecting ring 313 of the exemplary first liquid storage ring 31 abuts against the limiting surface 64 along the axial direction of the first connecting ring 313.

[0103] Further optionally, in the embodiment, as shown in Figure 2 , Figure 3 and Figure 8As shown, the inner circumferential wall of the mounting cavity 61 is further recessed with at least two first mounting slots 65, the outer circumferential wall of the stator core 1 is protruded with at least two first mounting lugs 15, and when the first liquid storage ring 31 abuts against the limiting surface 64 along the axial direction thereof, the at least two first mounting lugs 15 are correspondingly inserted into the at least two first mounting slots 65. Thus, the formed stator structure cannot rotate around the central axis thereof in the casing 6, and the stator core 1 is further fixed in the casing 6. It can be understood that the at least two first mounting slots 65 are spaced apart along the circumferential direction of the casing 6. Further, in the embodiment, each first mounting lug 15 extends to both ends of the stator core 1 along the axial direction of the stator core 1.

[0104] Specifically, in the embodiment, as shown in Figure 2 and Figure 3 , each first mounting lug 15 is provided with a first connecting hole 151 penetrating through the axial direction of the stator core 1, and the inner wall of the first mounting slot 65 is recessed with a second connecting hole 66 penetrating through the outer circumferential wall of the casing 6, and a bolt is threadedly connected with a nut through the first connecting hole 151 and the second connecting hole 66. Thus, the stator core 1 is fixed in the casing 6, and the stator structure is fixed in the casing 6. It is exemplarily provided that the number of first mounting lugs 15 is three. The number of first mounting lugs 15 can be adaptively increased or decreased according to actual working conditions.

[0105] Optionally, in the embodiment, as shown in Figure 6 and Figure 8 , the inner circumferential wall of the mounting cavity 61 is further recessed with at least two second mounting slots 67, the at least two second mounting slots 67 are spaced apart along the circumferential direction of the casing 6, the outer circumferential wall of the second liquid storage ring 32 is protruded with at least two second mounting lugs 325, the at least two second mounting slots 67 and the at least two second mounting lugs 325 are correspondingly provided, and each second mounting lug 325 is inserted into the corresponding second mounting slot 67 when the first liquid storage ring 31 abuts against the limiting surface 64 along the axial direction thereof. Thus, the formed stator structure cannot rotate around the central axis thereof in the casing 6, and the reliability of fixing the stator structure in the casing 6 can be further improved. Specifically, the at least two second mounting lugs 325 are connected to the outer circumferential wall of the second outer ring 322.

[0106] Specifically, in the embodiment, as shown in Figure 6 and Figure 8 , each second mounting lug 325 is provided with a third connecting hole 3251 penetrating through the axial direction of the second liquid storage ring 32, and the inner wall of the second mounting slot 67 is recessed with a fourth connecting hole 68, and a screw is threadedly connected through the third connecting hole 3251 and the fourth connecting hole 68. It is exemplarily provided that the number of second mounting lugs 325 is three. The number of second mounting lugs 325 can be adaptively increased or decreased according to actual working conditions.

[0107] The application further provides a motor assembling method for assembling the motor.

[0108] As shown in Figures 1-6 The motor assembling method comprises the following steps:

[0109] The relative positions of the stator core 1 and the two liquid storage rings 3 are fixed, so that the two liquid storage rings 3 are located at the axial two ends of the stator core 1 one by one, and each liquid storage ring 3 forms a liquid storage cavity with the corresponding axial end face of the stator core 1. Specifically, a tool clamp or the like is used to fix the relative positions of the stator core 1 and the two liquid storage rings 3.

[0110] The first part of the pouring sealant is poured into each second slot 122, and the second part of the pouring sealant is used to connect the stator core 1, the inner ring of each liquid storage ring 3 and the pouring sealant in each second slot 122 into an integral whole.

[0111] The first part of the pouring sealant and the second part of the pouring sealant are cured to form the liquid blocking ring 4, which is integrally formed on the stator core 1 and the two liquid storage rings 3.

[0112] After the relative positions of the stator core 1 and the two liquid storage rings 3 are fixed, only pouring the pouring sealant is needed to seal the opening of the second slot 122, seal the gap between the inner ring of the liquid storage ring 3 and the stator core 1, and connect the liquid storage ring 3, the stator core 1 and the plurality of liquid blocking strips 42 into an integral whole, which can effectively improve the assembling efficiency, ensure the connection reliability and sealing reliability compared with the related art.

[0113] Obviously, the above embodiments of the application are merely exemplary and are not intended to limit the embodiments of the application. Based on the above description, those skilled in the art can make other variations or changes in different forms. It is not necessary or possible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the claims of the application.

Claims

1. An electric machine characterized in that, The stator structure comprises: A stator core (1) provided with a central hole (11), at least two stator slots (12) recessed in the inner circumferential wall of the central hole (11), and at least two liquid cooling channels (13); the central hole (11), each stator slot (12) and each liquid cooling channel (13) all pass through the two axial end faces of the stator core (1) along the axial direction of the stator core (1), the at least two stator slots (12) and the at least two liquid cooling channels (13) are spaced apart along the circumferential direction of the stator core (1), and the at least two liquid cooling channels (13) are located on the outer periphery of all the stator slots (12); each stator slot (12) comprises a first slot (121) and a second slot (122) connected in communication, the first slot (121) is used for accommodating a stator winding (2), and the second slot (122) is directly communicated with the central hole (11); Two liquid storage rings (3) are provided at the axial ends of the stator core (1) one by one, each liquid storage ring (3) forms a liquid storage cavity with the corresponding axial end face of the stator core (1), and the two ends of each liquid cooling channel (13) are communicated with the two liquid storage cavities one by one, and the two liquid storage cavities are also used for accommodating the stator winding (2); A liquid blocking ring (4) comprises two liquid blocking ring bodies (41) and at least two liquid blocking strips (42) integrally formed, the two liquid blocking ring bodies (41) are provided one by one with the two liquid storage rings (3), and the at least two liquid blocking strips (42) are provided one by one with the at least two second slots (122); the liquid blocking strip (42) is injection molded in the second slot (122) to seal the slot opening of the second slot (122); the liquid blocking ring body (41) is injection molded between the inner ring of the liquid storage ring (3), the axial end face of the stator core (1) and all the liquid blocking strips (42) to seal the gap between the inner ring and the stator core (1), and to connect the liquid storage ring (3), the stator core (1) and all the liquid blocking strips (42) into an integral whole.

2. The electric machine of claim 1, wherein, The liquid blocking ring body (41) comprises a first ring part (411) and a second ring part (412) connected in communication, the first ring part (411) is injection molded in the inner circumferential wall of the inner ring, and the second ring part (412) is injection molded between the inner ring and the axial end face of the stator core (1) and connected with all the liquid blocking strips (42).

3. The motor of claim 2, wherein: an inner diameter of the first ring part (411) is equal to a hole diameter of the central hole (11); and / or an inner diameter of the second ring part (412) is equal to the hole diameter of the central hole (11); and / or each liquid blocking strip (42) is completely located in the corresponding second slot (122).

4. The electric machine of claim 1, wherein, Each of the liquid blocking ring bodies (41) has a first axial end face away from the liquid blocking strip (42), and each of the liquid storage rings (3) has a second axial end face away from the stator core (1), and the first axial end face of at least one of the liquid blocking ring bodies (41) is coplanar with the corresponding second axial end face.

5. The electric machine of any of claims 1-4, wherein, The outer ring of one of the liquid storage rings (3) and the stator core (1) form a first flow-through hole (5), and the first flow-through hole (5) is directly communicated with a liquid storage cavity formed by the liquid storage ring (3); the outer ring of another of the liquid storage rings (3) is provided with a second flow-through hole (3221) penetrating through the inner peripheral wall and the outer peripheral wall thereof; one of the first flow-through hole (5) and the second flow-through hole (3221) is an inflow hole, and the other is an outflow hole.

6. The electric machine of claim 5, wherein, The motor further comprises a machine shell (6) provided with a mounting cavity (61), and the stator structure is arranged in the mounting cavity (61); the machine shell (6) is provided with a third flow-through hole (62) penetrating through the inner peripheral wall of the mounting cavity (61), and the first flow-through hole (5) and the liquid cooling flow channel (13) are both directly communicated with a first end of the third flow-through hole (62), and a second end of the third flow-through hole (62) and the second flow-through hole (3221) are both used for being communicated with a cooling liquid source.

7. The electric machine of claim 6, wherein, The machine shell (6) is further provided with a liquid supply cavity (63), and the second end of the third flow-through hole (62) and the second flow-through hole (3221) are both communicated with the liquid supply cavity (63); The cooling liquid in the liquid supply cavity (63) is the cooling liquid source; or the liquid supply cavity (63) is communicated with the cooling liquid source.

8. The electric machine of claim 6, wherein, The inner peripheral wall of the mounting cavity (61) forms a limiting surface (64), and one of the liquid storage rings (3) abuts against the limiting surface (64) along the axial direction thereof.

9. The electric machine of claim 6, wherein, One of the two liquid storage rings (3) and the stator core (1) form the first flow-through hole (5) as a first liquid storage ring (31), and the other is a second liquid storage ring (32); The outer wall of the first liquid storage ring (31) and the inner peripheral wall of the mounting cavity (61) are provided with a first sealing ring (81), and / or the outer ring of the second liquid storage ring (32) and the stator core (1) are provided with a second sealing ring (82).

10. A method of assembling an electrical machine, characterised in that, The motor assembly method comprises: Fixing the relative positions of the stator core (1) and the two liquid storage rings (3) so that the two liquid storage rings (3) are located at the axial two ends of the stator core (1) one by one, and a liquid storage cavity is formed between each of the liquid storage rings (3) and the corresponding axial end face of the stator core (1); Pouring a first part of the pouring sealant into each of the second grooves (122), and connecting the stator core (1), the inner ring of each of the liquid storage rings (3), and the pouring sealant in each of the second grooves (122) into an integral whole by using a second part of the pouring sealant; The first part of the sealant and the second part of the sealant are cured to form the liquid blocking ring (4) which is integrally formed on the stator core (1) and the two liquid storage rings (3).

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