Electric motor

Abstract

The present application relates to an electric motor. The electric motor comprises an electric motor housing and a stator core. The electric motor housing has a liquid inlet. The stator core is arranged inside the electric motor housing; the stator core comprises an annular stator yoke and a plurality of stator teeth distributed at intervals in the circumferential direction of the stator yoke, and the stator core further comprises a first end face located on one axial end and a second end face located on the other axial end. A first tooth root cooling channel extending in the axial direction of the stator core is provided at the tooth roots of the stator teeth, and the first tooth root cooling channel comprises a first inlet and a first outlet, the first inlet being arranged between the first end face and the second end face, and the first outlet being arranged on the second end face; and in the axial direction of the stator core, the liquid inlet is closer to the first outlet than the first inlet, and a first outer cooling channel bringing the liquid inlet into communication with the first inlet is formed between the electric motor housing and the stator core.

Description

Electric machine Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202410830386.2, filed on June 25, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to, but is not limited to, the technical field of electric machine cooling, in particular, relates to an electric machine. BACKGROUND

[0003] The stator core of the electric machine is provided with a plurality of stator teeth in the circumferential direction, and a stator slot is formed between any two adjacent stator teeth, and a stator winding is installed in the stator slot. Therefore, the highest temperature point of the stator core is at the stator slot. At present, the cooling method of the electronic stator mostly adopts cooling liquid cooling, specifically, a hole is opened at the yoke of the stator, and the cooling liquid flows through the hole to take away the heat of the stator core, thereby realizing the cooling of the stator core. SUMMARY

[0004] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0005] The present application provides an electric machine, which can realize cooling at the highest temperature point of the stator core.

[0006] An electric machine, comprising: an electric machine shell formed with a liquid inlet; a stator core arranged in the interior of the electric machine shell, the stator core comprising an annular stator yoke and a plurality of stator teeth distributed along the circumferential direction of the stator yoke, the stator core further comprising a first end face at one axial end and a second end face at the other axial end, wherein a first tooth root cooling channel extending in the axial direction of the stator core is arranged at the tooth root of the stator tooth, the first tooth root cooling channel comprises a first inlet and a first outlet, the first inlet is arranged between the first end face and the second end face, the first outlet is arranged at the second end face, the liquid inlet is closer to the first outlet than the first inlet in the axial direction of the stator core, and a first external cooling channel is formed between the electric machine shell and the stator core, which communicates the liquid inlet and the first inlet.

[0007] Optionally, the stator tooth is provided with a second tooth root cooling channel extending along the axial direction of the stator core, the second tooth root cooling channel comprises a second inlet and a second outlet, the second inlet is arranged between the first end face and the second end face, and the second outlet is arranged at the first end face along the axial direction of the stator core, the liquid inlet is closer to the second outlet than the second inlet, and the motor shell and the stator core further form a second outer cooling channel communicating the liquid inlet and the second inlet.

[0008] Optionally, the stator core comprises a plurality of laminations stacked along the axial direction, each of the laminations comprises an annular yoke portion and a plurality of tooth portions spaced along the circumferential direction of the yoke portion, the yoke portions of the plurality of laminations are stacked to form the stator yoke, and the tooth portions of the plurality of laminations are stacked to form the stator teeth.

[0009] Optionally, the plurality of laminations comprises a first lamination located at one end of the stator core along the axial direction, a second lamination located at the other end of the stator core along the axial direction, a plurality of third laminations located between the first lamination and the second lamination, and a fourth lamination located between the first lamination and the plurality of third laminations, the fourth lamination is provided with the first inlet, the second lamination is provided with the first outlet, the tooth portions of each of the third laminations are provided with a first hole at the tooth root, the first holes of the plurality of third laminations are coaxially arranged to form the first tooth root cooling channel, and the first lamination blocks the first holes.

[0010] Optionally, the first inlet is a first notch extending along the radial direction of the fourth lamination.

[0011] Optionally, the opening size of the first notch gradually decreases from the outside to the inside, the larger end of the opening of the first notch is in communication with the first outer cooling channel, and the smaller end of the opening of the first notch is in communication with the first hole.

[0012] Optionally, the plurality of laminations further comprises a fifth lamination located between the second lamination and the plurality of third laminations, the fifth lamination is provided with the second inlet, the first lamination is provided with the second outlet, the tooth portions of each of the third laminations are provided with a second hole at the tooth root, the second holes of the plurality of third laminations are coaxially arranged to form the second tooth root cooling channel, the second lamination blocks the second holes, and the second holes and the first holes are alternately arranged.

[0013] Optionally, the second inlet is a second notch extending along the radial direction of the fifth lamination.

[0014] Optionally, the second gap has a gradually decreasing opening size from outside to inside, and the second gap has a larger opening end in communication with the second outer cooling channel and a smaller opening end in communication with the second hole.

[0015] Optionally, the number of the third laminations is greater than the number of the first laminations, the second laminations, the fourth laminations and the fifth laminations.

[0016] Optionally, the number of the first laminations is one, the number of the second laminations is one, the number of the fourth laminations is one, and the number of the fifth laminations is one.

[0017] Optionally, the plurality of laminations are fixed by bonding.

[0018] Optionally, the first lamination and the second lamination have the same structure.

[0019] Optionally, the stator core and the motor shell are connected by fasteners.

[0020] Optionally, the motor further comprises a motor shell cover detachably connected with the motor shell and configured to seal the motor shell.

[0021] The application provides a motor, wherein a first tooth root cooling channel is arranged at a tooth root of a stator tooth and extends along an axial direction of a stator core. Since the tooth root is closer to a stator slot, the stator slot can be cooled, and the stator core at a highest temperature point can be cooled, and the cooling effect is better. In addition, a liquid inlet is arranged closer to a first outlet than a first inlet, and the liquid inlet is in communication with the first inlet through a first outer cooling channel. This makes the cooling liquid first contact a stator yoke from an outer side of the stator core, and then flow into the first tooth root cooling channel through the first inlet. On the one hand, the stator yoke is cooled, and on the other hand, the length of the first tooth root cooling channel is extended, so that the cooling liquid has a longer flow path in the first tooth root cooling channel, and the cooling effect on the stator slot is better.

[0022] Other aspects can become apparent after consideration of the drawings and detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0023] FIG. 1 is a cross-sectional view of a partial structure of a motor according to an example embodiment of the application.

[0024] FIG. 2 is a schematic view of a stator core according to an example embodiment of the application.

[0025] FIG. 3 is another cross-sectional view of a partial structure of a motor according to an example embodiment of the application.

[0026] FIG. 4 is an exploded view of the stator core shown in FIG. 2.

[0027] Figure 5 is a schematic diagram of the first stack of plates.

[0028] Figure 6 is a schematic diagram of the second stack.

[0029] Figure 7 is a schematic diagram of the third stack.

[0030] Figure 8 is a schematic diagram of the fourth stack.

[0031] Figure 9 is a schematic diagram of the fifth stack.

[0032] Figure 10 is a schematic diagram of the motor housing cover.

[0033] Explanation of reference numerals in the attached drawings: 100 Motor; 10 Motor housing; 11 Liquid inlet; 12 First external cooling channel; 13 Second external cooling channel; 20 Stator core; 21 Stator yoke; 22 Stator tooth; 213 Stator slot; 214 Tooth root; 23 First end face; 24 Second end face; 25 First tooth root cooling channel; 250 First inlet; 251 First outlet; 26 Second tooth root cooling channel; 260 Second inlet; 261 Second outlet; 201 Laminate; 201a First laminate; 201b Second laminate; 201c Third laminate; 201d Fourth laminate; 201e Fifth laminate; 2010 Protrusion; 2011 Yoke; 2012 Tooth; 2013 Slot; 2014 First hole; 2015 First notch; 2016 Second hole; 2017 Second notch; 2016' First connecting hole; 2014' Second connecting hole; 30 Motor housing cover; 31 Connecting protrusion. Detailed Implementation

[0034] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0035] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0036] This application provides an electric motor 100.

[0037] Please refer to FIG. 1 and FIG. 2, FIG. 1 is a cross-sectional view of a partial structure of an electric machine 100 provided by the present application, and FIG. 2 is a schematic view of a stator core 20.

[0038] The electric machine 100 comprises an electric machine shell 10 and a stator core 20 arranged inside the electric machine shell 10. The electric machine shell 10 is formed with a liquid inlet 11 for input of cooling liquid. The cooling liquid includes but is not limited to coolant oil.

[0039] A first gap is also reserved between the electric machine shell 10 and the stator core 20, and the first gap forms a first outer cooling channel 12 in communication with the liquid inlet 11.

[0040] The stator core 20 comprises a ring-shaped stator yoke 21 and a plurality of stator teeth 22 distributed along the circumferential direction of the stator yoke 21. The plurality of stator teeth 22 can be uniformly distributed around the axis O of the stator core 20. A stator slot 213 is formed between any two adjacent stator teeth 22, and each stator slot 213 is used to mount a stator winding (not shown). The specific number of stator teeth 22 is not limited.

[0041] The plurality of stator teeth 22 are formed on the side of the stator yoke 21 facing the rotor of the electric machine 100. In the embodiment shown in FIG. 2, the stator core 20 is an inner stator core, and the plurality of stator teeth 22 are formed on the inner circumferential side of the stator yoke 21. The hollow part of the stator core 20 is used to mount the rotor. In some other embodiments, the stator core 20 can also be an outer stator core, i.e., the plurality of stator teeth 22 are formed on the outer circumferential side of the stator yoke 21, and the rotor is arranged around the outer side of the stator core. The present application is described by taking the inner stator core as an example.

[0042] The stator core 20 further comprises a first end face 23 at one axial end and a second end face 24 at the other axial end. The tooth root 214 of the stator tooth 22 is provided with a first tooth root cooling channel 25 extending along the axial direction of the stator core 20. The tooth root refers to the position where the stator tooth 22 meets the stator yoke 21. The first tooth root cooling channel 25 comprises a first inlet 250 and a first outlet 251. The first inlet 250 is arranged between the first end face 23 and the second end face 24, and the first outlet 251 is arranged at the second end face 24. The first outer cooling channel 12 is in communication with the liquid inlet 11 and the first inlet 250, and along the axial direction of the stator core 20, the liquid inlet 11 is closer to the first outlet 251 than the first inlet 250.

[0043] According to the above description, it can be known that the stator core 20 is provided with the first tooth root cooling channel 25, which is arranged at the tooth root 214 of the stator tooth 22 and extends along the axial direction of the stator core 20. Since the tooth root 214 is closer to the stator slot 213, the cooling of the stator slot 213 can be realized, and thus the cooling of the highest temperature point of the stator core 20 is realized, and the cooling effect is better.

[0044] It should be noted that the liquid inlet 11 is arranged closer to the first outlet 251 than the first inlet 250, and the liquid inlet 11 is communicated with the first inlet 250 through the first outer cooling channel 12, which makes the cooling liquid first contact the stator yoke 21 from the outside of the stator core 20, and then flows into the first tooth root cooling channel 25 through the first inlet 250, on the one hand, achieving cooling of the stator yoke 21, and on the other hand, extending the length of the first tooth root cooling channel 25, making the path of the cooling liquid in the first tooth root cooling channel 25 longer, and the cooling effect at the stator slot 213 better. The dashed line and arrow in FIG. 1 show the flow path and direction of the cooling liquid in the first tooth root cooling channel 25.

[0045] Please refer to FIG. 2 and FIG. 3, FIG. 3 is another sectional view of part of the structure of the motor 100.

[0046] In one embodiment, the tooth root 214 of the stator tooth 22 is provided with a second tooth root cooling channel 26 extending along the axial direction of the stator core 20, the second tooth root cooling channel 26 includes a second inlet 260 and a second outlet 261, the second inlet 260 is arranged between the first end face 23 and the second end face 24, and the second outlet 261 is arranged at the first end face 23. And, along the axial direction of the stator core 20, the liquid inlet 11 is closer to the second outlet 261 than the second inlet 260. A second gap is also reserved between the motor housing 10 and the stator core 20, which forms a second outer cooling channel 13 that communicates the liquid inlet 11 and the second inlet 260. In this way, the second outer cooling channel 13 is parallel to the first outer cooling channel 12, and the cooling liquid input from the liquid inlet 11 flows along the first outer cooling channel 12 and the second outer cooling channel 13 to the two ends of the stator core 20 in the axial direction, respectively, through the first inlet 250 and the second inlet 260 to flow through the tooth root 214 of the stator tooth 22, which is conducive to achieving uniform cooling of each part of the stator core 20.

[0047] In the embodiment shown in FIG. 2, a plurality of first tooth root cooling channels 25 are provided, and a plurality of second tooth root cooling channels 26 are provided, and the plurality of first tooth root cooling channels 25 and the plurality of second tooth root cooling channels 26 are arranged alternately. Among them, the first outlet 251 of each first tooth root cooling channel 25 is arranged at the second end face 24, and the cooling liquid entering each first tooth root cooling channel 25 is sprayed out from the first outlet 251, and the second outlet 261 of each second tooth root cooling channel 26 is arranged at the first end face 23, and the cooling liquid entering each second tooth root cooling channel 26 is sprayed out from the second outlet 261.

[0048] Please refer to FIG. 4 to FIG. 9, FIG. 4 is an exploded view of the stator core 20, FIG. 5 is a schematic view of the first lamination 201a, FIG. 6 is a schematic view of the second lamination 201b, FIG. 7 is a schematic view of the third lamination 201c, FIG. 8 is a schematic view of the fourth lamination 201d, and FIG. 9 is a schematic view of the fifth lamination 201e.

[0049] The stator core 20 includes a plurality of laminations 201 stacked in the axial direction, each lamination 201 including an annular yoke portion 2011 and a plurality of tooth portions 2012 spaced apart along the circumferential direction of the yoke portion 2011 (see FIG. 5). The yoke portions 2011 of the laminations 201 are stacked to form a stator yoke 21, and the tooth portions 2012 of the laminations 201 are stacked to form a stator tooth 22. A slot portion 2013 is provided between adjacent tooth portions 2012, and the slot portions 2013 of the laminations 201 are aligned to form a stator slot 213.

[0050] The plurality of laminations 201 includes a first lamination 201a at one end of the stator core 20 in the axial direction, a second lamination 201b at the other end of the stator core 20 in the axial direction, a plurality of third laminations 201c between the first lamination 201a and the second lamination 201b, and a fourth lamination 201d between the first lamination 201a and the plurality of third laminations 201c. An outer end surface of the first lamination 201a forms a first end surface 23, and an outer end surface of the second lamination 201b forms a second end surface 24.

[0051] The fourth lamination 201d is provided with a first inlet 250, and the second lamination 201b is provided with a first outlet 251. The tooth portions 2012 of each third lamination 201c are provided with a first hole 2014 at the tooth root, and the first holes 2014 of the plurality of third laminations 201c are coaxially arranged to form a first tooth root cooling passage 25. The first lamination 201a blocks the first holes 2014 to ensure that the first tooth root cooling passage 25 extends along a predetermined path, so that the cooling liquid flows from the inlet 11 to the first outlet 251 via the first outer cooling passage 12, the first inlet 250, and the first tooth root cooling passage 25.

[0052] In the embodiment shown in FIG. 4, the number of third laminations 201c is greater than the number of other laminations 201, which can increase the length of the first tooth root cooling passage 25. In embodiments with a large number of third laminations 201c, the plurality of third laminations 201c can be assembled into a plurality of lamination groups, and the plurality of lamination groups are stacked, each lamination group including a plurality of third laminations 201c. The number of first laminations 201a is one, and the number of fourth laminations 201d is one, which can appropriately increase the number of third laminations 201c, but is not limited thereto.

[0053] In the embodiment shown in FIG. 6, the first outlet 251 is provided in plurality, and one first outlet 251 can be provided at every interval of the tooth portion 2012. In the embodiment shown in FIG. 7, the first hole 2014 is provided in plurality, and the plurality of first holes 2014 are in one-to-one correspondence with the plurality of first outlets 251.

[0054] The specific manner of forming the first inlet 250 at the fourth lamination 201d is not limited. In an embodiment, the outer diameter of the fourth lamination 201d can be set to be smaller than the outer diameters of the first lamination 201a and the third lamination 201c, and in the axial projection of the stator core 20, the projection area of the fourth lamination 201d is located outside the projection area of the first hole 2014, so that the first outer cooling channel 12 can communicate with the first tooth root cooling channel 25 through the space outside the periphery of the fourth lamination 201d, and the space outside the periphery of the fourth lamination 201d forms the first inlet 250.

[0055] In the embodiment, as shown in FIG. 8, the fourth lamination 201d is provided with a first notch 2015 extending in the radial direction, the first notch 2015 communicates with the first outer cooling channel 12 and also communicates with the first hole 2014. In this way, the first notch 2015 forms the first inlet 250, which can ensure that the cooling liquid enters the first tooth root cooling channel 25 from the first notch 2015, and on the other hand, the outer diameter of the fourth lamination 201d can also be set to be the same as the outer diameters of the first lamination 201a and the third lamination 201c, so as to reduce electromagnetic loss.

[0056] The specific shape of the first notch 2015 is not limited. In the embodiment shown in FIG. 8, the opening size of the first notch 2015 gradually decreases from the outside to the inside, the larger end of the opening of the first notch 2015 communicates with the first outer cooling channel 12, and the smaller end of the opening of the first notch 2015 communicates with the first hole 2014, so as to achieve flow guiding. The number of the first notches 2015 is the same as the number of the first holes 2014, and the plurality of first notches 2015 are in one-to-one correspondence with the plurality of first holes 2014.

[0057] In the embodiment shown in FIG. 4, the plurality of laminations 201 further include a fifth lamination 201e located between the second lamination 201b and the plurality of third laminations 201c. The fifth lamination 201e is formed with a second inlet 260, and the first lamination 201a is provided with a second outlet 261. The tooth root of the tooth portion 2012 of each third lamination 201c is provided with a second hole 2016, and the second holes 2016 of the plurality of third laminations 201c are coaxially arranged to form a second tooth root cooling channel 26. The second lamination 201b blocks the second hole 2016 to ensure that the second tooth root cooling channel 26 extends along the preset path, so that the cooling liquid flows from the inlet 11 to the second outlet 261 through the second outer cooling channel 13, the second inlet 260 and the second tooth root cooling channel 26.

[0058] In the embodiment shown in FIG. 5, the second outlet 261 is provided in plurality, one for each interval of the tooth portion 2012. In the embodiment shown in FIG. 7, the second hole 2016 is provided in plurality, and the plurality of second holes 2016 are in one-to-one correspondence with the plurality of second outlets 261. The first hole 2014 and the second hole 2016 can be arranged alternately, for example, one second hole 2016 is arranged between every two adjacent first holes 2014, but not limited thereto.

[0059] It is also to be noted that, as shown in FIGS. 8 and 9, the fourth lamination 201d is further provided with a first communication hole 2016', which communicates the second hole 2016 with the second outlet 261. The first communication hole 2016' can be provided in plurality, and the plurality of first communication holes 2016' are in one-to-one correspondence with the plurality of second holes 2016 and the plurality of second outlets 261. The fifth lamination 201e is further provided with a second communication hole 2014', which communicates the first hole 2014 with the first outlet 251. The second communication hole 2014' can be provided in plurality, and the plurality of second communication holes 2014' are in one-to-one correspondence with the plurality of first holes 2014 and the plurality of first outlets 251.

[0060] In one embodiment, as shown in FIG. 9, the fifth lamination 201e is provided with a second notch 2017 extending in the radial direction, which communicates with the second outer cooling channel 13 and the second hole 2016. In this way, the second notch 2017 forms the second inlet 260, which can ensure that the cooling liquid enters the second root cooling channel 26 from the second notch 2017, and the outer diameter of the fifth lamination 201e can be set to be the same as that of the second lamination 201b and the third lamination 201c, so as to reduce the magnetic field loss.

[0061] The specific shape of the second notch 2017 is not limited. In the embodiment shown in FIG. 9, the opening size of the second notch 2017 gradually decreases from the outside to the inside, the larger end of the opening of the second notch 2017 communicates with the second outer cooling channel 13, and the smaller end of the opening of the second notch 2017 communicates with the second hole 2016, so as to achieve the flow guiding. The number of the second notch 2017 is the same as that of the second hole 2016, and the plurality of second notches 2017 are in one-to-one correspondence with the plurality of second holes 2016.

[0062] In one embodiment, the number of the second lamination 201b is one, and the number of the fifth lamination 201e is one, so as to achieve the flow of the cooling liquid along the preset path, and appropriately increase the number of the third lamination 201c, but not limited thereto.

[0063] In one embodiment, the first laminations 201a and the second laminations 201b are structurally identical, and the first laminations 201a are offset by a preset angle relative to the second laminations 201b along the circumferential direction of the stator core 20. In this way, the types of laminations 201 can be reduced, and the mold cost of the laminations 201 can be saved.

[0064] In the embodiments shown in FIGS. 5-9, each lamination 201 is provided with a radially protruding protrusion 2010, and the protrusions 2010 of the laminations 201 are aligned, and the connecting holes are provided through the protrusions 2010 for fasteners such as bolts to pass through, and the stator core 20 is connected to the motor housing 10 by the fasteners. The protrusions 2010 of each lamination 201 can be provided in multiple, and the protrusions 2010 of each lamination 201 are aligned, and the stator core 20 is connected to the motor housing 10 by multiple fasteners.

[0065] In other embodiments, the stator core 20 can be connected to the motor housing 10 by a hot fitting method. The laminations 201 can be fixed by bonding or welding. In the present embodiment, the laminations 201 are fixed by bonding.

[0066] Please refer to FIGS. 1 and 10, and FIG. 10 is a schematic view of the motor housing cover 30.

[0067] The motor housing cover 30 is connected to the motor housing 10 to seal the opening of the motor housing 10, and the motor housing 10 and the motor housing cover 30 are detachably connected to facilitate maintenance of the stator core 20 and the stator winding (not shown). The motor housing cover 30 can be provided in the same shape as the stator core 20. The motor housing cover 30 is provided with a connecting protrusion 31 that is aligned with and connected to the protrusion 2010.

[0068] The above only describes some embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An electric motor (100), comprising: The motor housing (10) has a liquid inlet (11); A stator core (20) is disposed inside the motor housing (10). The stator core (20) includes an annular stator yoke (21) and a plurality of stator teeth (22) spaced apart along the circumferential direction of the stator yoke (21). The stator core (20) also includes a first end face (23) located at one end of the axial direction and a second end face (24) located at the other end of the axial direction. The stator tooth (22) has a first tooth root cooling channel (25) extending axially along the stator core (20) at the tooth root (214). The first tooth root cooling channel (25) includes a first inlet (250) and a first outlet (251). The first inlet (250) is located between the first end face (23) and the second end face (24), and the first outlet (251) is located on the second end face (24). Along the axial direction of the stator core (20), the liquid inlet (11) is closer to the first outlet (251) than the first inlet (250). A first external cooling channel (12) is formed between the motor housing (10) and the stator core (20), connecting the liquid inlet (11) and the first inlet (250).

2. The motor (100) according to claim 1, wherein, The stator tooth (22) has a second tooth root cooling channel (26) extending axially along the stator core (20) at the tooth root (214). The second tooth root cooling channel (26) includes a second inlet (260) and a second outlet (261). The second inlet (260) is located between the first end face (23) and the second end face (24), and the second outlet (261) is located on the first end face (23). Along the axial direction of the stator core (20), the liquid inlet (11) is closer to the second outlet (261) than the second inlet (260). A second external cooling channel (13) is also formed between the motor housing (10) and the stator core (20), connecting the liquid inlet (11) and the second inlet (260).

3. The motor (100) according to claim 2, wherein, The stator core (20) includes a plurality of laminations (201) stacked along the axial direction, each lamination (201) including an annular yoke (2011) and a plurality of teeth (2012) spaced apart along the circumferential direction of the yoke (2011). The yoke portions (2011) of the plurality of laminations (201) are stacked to form the stator magnetic yoke (21). The teeth (2012) of the plurality of laminations (201) are stacked to form the stator teeth (22).

4. The motor (100) according to claim 3, wherein, The plurality of laminations (201) includes a first lamination (201a) located at one end of the axial direction of the stator core (20), a second lamination (201b) located at the other end of the axial direction of the stator core (20), a plurality of third laminations (201c) located between the first lamination (201a) and the second lamination (201b), and a fourth lamination (201d) located between the first lamination (201a) and the plurality of third laminations (201c). The fourth lamination (201d) is provided with the first inlet (250), and the second lamination (201b) is provided with the first outlet (251). Each of the third laminations (201c) has a first hole (2014) at the root of the tooth (2012). The first holes (2014) of the plurality of third laminations (201c) are coaxially arranged to form a first tooth root cooling channel (25). The first lamination (201a) blocks the first hole (2014).

5. The motor (100) according to claim 4, wherein, The first inlet (250) is a first notch (2015) extending radially along the fourth lamination (201d).

6. The motor (100) according to claim 5, wherein, The opening size of the first notch (2015) gradually decreases from the outside to the inside. The larger end of the opening of the first notch (2015) is connected to the first external cooling channel (12), and the smaller end of the opening of the first notch (2015) is connected to the first hole (2014).

7. The motor (100) according to any one of claims 4 to 6, wherein, The plurality of stacked sheets (201) further includes a fifth stacked sheet (201e) located between the second stacked sheet (201b) and the plurality of third stacked sheets (201c). The fifth lamination (201e) is provided with the second inlet (260), and the first lamination (201a) is provided with the second outlet (261). Each of the third laminations (201c) has a second hole (2016) at the root of the tooth portion (2012). The second holes (2016) of the plurality of third laminations (201c) are coaxially arranged to form a second tooth root cooling channel (26). The second lamination (201b) blocks the second hole (2016). The second hole (2016) is alternately arranged with the first hole (2014).

8. The motor (100) according to claim 7, wherein, The second inlet (260) is a second notch (2017) extending radially along the fifth lamination (201e).

9. The motor (100) according to claim 8, wherein, The size of the opening of the second notch (2017) gradually decreases from the outside to the inside. The larger end of the opening of the second notch (2017) is connected to the second external cooling channel (13), and the smaller end of the opening of the second notch (2017) is connected to the second hole (2016).

10. The motor (100) according to any one of claims 7 to 9, wherein, The number of the third stack (201c) is greater than the number of the first stack (201a), the second stack (201b), the fourth stack (201d), and the fifth stack (201e).

11. The motor (100) according to claim 10, wherein, The first stack (201a) consists of one piece, the second stack (201b) consists of one piece, the fourth stack (201d) consists of one piece, and the fifth stack (201e) consists of one piece.

12. The motor (100) according to any one of claims 3 to 11, wherein, The multiple stacked pieces (201) are bonded and fixed.

13. The motor (100) according to any one of claims 4 to 11, wherein, The first stack (201a) and the second stack (201b) have the same structure.

14. The motor (100) according to any one of claims 1 to 13, wherein, The stator core (20) is connected to the motor housing (10) by fasteners.

15. The motor (100) according to any one of claims 1 to 14, further comprising: The motor housing cover (30) is detachably connected to the motor housing (10) and is configured to seal the motor housing (10).

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