Motor spindle cooling device

Abstract

The application discloses a motor main shaft cooling device, which comprises a shell assembly, a stator assembly, a rotor assembly and a water cooling assembly. The water cooling assembly comprises a water cooling flow channel, an outer sleeve component and two inner sleeve components which respectively wrap two winding protrusions. The inner sleeve components wrap the winding protrusions, and the outer sleeve component wraps the stator core and the two inner sleeve components. The water cooling flow channel comprises a water inlet flow channel, a water outlet flow channel and an intermediate flow channel connected between the water inlet flow channel and the water outlet flow channel. The intermediate flow channel comprises two end flow channels which are respectively formed by the outer peripheral side surface, the outer end surface and the inner peripheral side surface of the two inner sleeve components and the outer sleeve component, and a side flow channel which is formed by the outer peripheral side surface of the outer sleeve component and the shell assembly. The two end flow channels are respectively communicated with the side flow channel. The motor main shaft cooling device can realize heat dissipation of the stator assembly and the rotor assembly through the water cooling assembly, so that the bearing overheating is avoided and the driving performance of the motor main shaft is ensured.

Description

Technical Field

[0001] This invention relates to the field of motor spindles, and more particularly to a motor spindle cooling device. Background Technology

[0002] With the development of motor spindle technology, more and more CNC machine tools are adopting motor spindle drives to replace the traditional motor-driven mechanical spindles. Compared to mechanical spindles, motor spindles have advantages such as high speed, zero transmission chain, and compact structure. However, these advantages also bring severe challenges to the use of motor spindle bearings. Depending on the brand and model of the motor, the temperature rise of some motor stators can reach 100℃ or even higher. The compact structure of the motor spindle makes it difficult to dissipate the heat generated by the motor's stator and rotor. When this heat is transferred to the bearings through the bearing housing or air, it can cause the bearings to overheat, affecting their performance. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a motor spindle cooling device. By incorporating a water-cooling component, it can dissipate heat from the stator and rotor assemblies, thereby preventing bearing overheating and ensuring the driving performance of the motor spindle.

[0004] The technical solution adopted in this invention is as follows:

[0005] A motor spindle cooling device includes a housing assembly, a stator assembly, a rotor assembly, and a water-cooling assembly. The stator assembly is disposed within the housing assembly and includes a hollow stator core and motor windings disposed on the stator core. The motor windings have an internal winding portion disposed within the stator core and two winding protrusions respectively protruding from the front and rear ends of the stator core. The rotor assembly includes a shaft and a rotor component sleeved and fixed on the shaft and disposed inside the stator core. The front part of the housing assembly is rotatably connected to the shaft via a front bearing assembly, and the rear part of the housing assembly is rotatably connected to the shaft via a rear bearing assembly. The water-cooling assembly is disposed within the housing assembly and includes a water-cooling channel, an outer sleeve component, and two windings respectively enclosing the shaft. The inner sleeve component of the two winding protrusions, the front end of the outer sleeve component is arranged behind the front bearing assembly and the rear end is arranged in front of the rear bearing assembly; the inner sleeve component wraps the outer peripheral side, outer end face and inner peripheral side of the winding protrusions; the outer sleeve component wraps the outer peripheral side of the stator core, as well as the outer peripheral side, outer end face and inner peripheral side of the two inner sleeve components; the water cooling channel includes an inlet channel, an outlet channel and an intermediate channel connecting the inlet channel and the outlet channel, the intermediate channel includes two end channels formed by the outer peripheral side, outer end face and inner peripheral side of the two inner sleeve components and the outer sleeve component respectively, and a side channel formed by the outer peripheral side of the outer sleeve component and the housing assembly, and the two end channels are respectively connected to the side channels.

[0006] Preferably, the side flow channel includes a first side flow channel and a second side flow channel. The inlet flow channel is located at the rear of the outer casing member and connected to the inlet end of the end flow channel at the rear end. The outlet flow channel is located at the rear of the outer casing member. The rear end of the first side flow channel is connected to the outlet end of the end flow channel at the rear end, and the front end is connected to the inlet end of the end flow channel at the front end. The front end of the second side flow channel is connected to the outlet end of the end flow channel at the front end, and the rear end is connected to the outlet flow channel at the rear end. Or,

[0007] The side flow channel includes a first side flow channel and a second side flow channel. The inlet flow channel is located at the rear of the outer casing member, and the outlet flow channel is located at the rear of the outer casing member and connected to the outlet end of the end flow channel at the rear end. The rear end of the first side flow channel is connected to the inlet flow channel, and the front end is connected to the inlet end of the end flow channel at the front end. The front end of the second side flow channel is connected to the outlet end of the end flow channel at the front end, and the rear end is connected to the inlet end of the end flow channel at the rear end.

[0008] Preferably, the first side flow channel and the second side flow channel are respectively configured as spiral channel structures arranged around the outer periphery of the stator core between the outer periphery of the outer casing component and the inner periphery of the housing assembly, and the first side flow channel and the second side flow channel are arranged side by side along the same spiral direction.

[0009] Preferably, the inner sleeve component includes a first inner ring plate that wraps around the outer peripheral side of the winding protrusion, a second inner ring plate that wraps around the outer end face of the winding protrusion, and a third inner ring plate that wraps around the inner peripheral side of the winding protrusion.

[0010] The outer casing component includes a first outer ring plate that wraps around the outer periphery of the stator core and the outer periphery of the two inner casing components, two second outer ring plates that respectively wrap around the outer end faces of the two inner casing components, and two third outer ring plates that respectively wrap around the inner periphery of the two inner casing components. The outer periphery of the first outer ring plate is fitted and fixed to the inner periphery of the housing assembly. The end flow channel includes a first surface flow channel formed by the first outer ring plate and the first inner ring plate, a second surface flow channel formed by the second outer ring plate and the second inner ring plate, and a third surface flow channel formed by the third outer ring plate and the third inner ring plate. The inlet and outlet ends of the two end flow channels are both located on their first surface flow channels.

[0011] Preferably, the first surface flow channel includes a first surface flow channel segment one connected to the inlet end of its end flow channel and a second surface flow channel segment two connected to the outlet end of its end flow channel. The first surface flow channel segment one and the first surface flow channel segment two are respectively arranged around the outer peripheral side of the winding protrusion between the two sides of the first inner ring plate and the first outer ring plate; the second surface flow channel includes a second surface flow channel segment one connected to the outlet end of the first surface flow channel segment one and a second surface flow channel segment two connected to the inlet end of the first surface flow channel segment two. The second surface flow channel is arranged around the outer end face of the winding protrusion on both sides of the second inner ring plate and between the second outer ring plate; the third surface flow channel includes a third surface flow channel section one connected to the outlet end of the second surface flow channel section one and a third surface flow channel section two connected to the inlet end of the second surface flow channel section two. The third surface flow channel section one and the third surface flow channel section two are arranged around the inner circumferential side of the winding protrusion on both sides of the third inner ring plate and between the third outer ring plate. The outlet end of the third surface flow channel section one is connected to the inlet end of the third surface flow channel section two.

[0012] Preferably, the third flow channel section one includes two third semi-ring sections one arranged side by side along the axial direction of the stator core, and a third return section one connected between the ends of the two third semi-ring sections one away from the water inlet end of the third flow channel section one; the third flow channel section two includes two third semi-ring sections two arranged side by side along the axial direction of the stator core, and a third return section two connected between the ends of the two third semi-ring sections two away from the water outlet end of the third flow channel section two; the water inlet end of the third flow channel section one and the water outlet end of the third flow channel section two are arranged opposite each other with a gap, and the water outlet end of the third flow channel section one is connected to the water inlet end of the third flow channel section two.

[0013] Preferably, the rotating shaft is provided with a front fan blade structure arranged between the rear side of the front bearing assembly and the front end of the outer sleeve member. The front fan blade structure can fan the hot air at the front end of the rotor member toward the surface of a portion of the outer sleeve member arranged on the inner circumference side of the front winding protrusion as the rotating shaft rotates; and / or,

[0014] The rotating shaft is provided with a rear fan blade structure arranged between the front side of the rear bearing assembly and the rear end of the outer sleeve component. The rear fan blade structure can fan the hot air at the rear end of the rotor component to flow towards the surface of a portion of the outer sleeve component arranged on the inner circumference side of the rear winding protrusion as the rotating shaft rotates.

[0015] Preferably, the housing assembly includes a main chamber, a front chamber located in front of the main chamber and communicating with it, and a rear chamber located in rear of the main chamber and communicating with it. The stator core, motor windings, rotor components, and water-cooling components are arranged in the main chamber, with the front end face of the outer sleeve component fitting against the front sidewall of the main chamber and the rear end face fitting against the rear sidewall of the main chamber. The front bearing assembly and front fan blade structure are arranged in the front chamber, and the front chamber, the front fan blade structure, and a portion of the outer sleeve component on the inner circumference of the front winding protrusion form a front air duct arranged on the outer circumference of the rotating shaft. The rear bearing assembly and rear fan blade structure are arranged in the rear chamber, and the rear chamber, the rear fan blade structure, and a portion of the outer sleeve component on the inner circumference of the rear winding protrusion form a rear air duct arranged on the outer circumference of the rotating shaft.

[0016] Preferably, the inner circumferential surface of a portion of the outer sleeve member on the inner circumferential side of the front winding protrusion is provided with a plurality of toothed groove structures, and the inner circumferential surface of a portion of the outer sleeve member on the inner circumferential side of the rear winding protrusion is provided with a plurality of toothed groove structures.

[0017] Preferably, the rotor component includes a mounting bracket sleeved and fixed on the rotating shaft, and a plurality of magnetic steel sheets fixed to the outer peripheral side of the mounting bracket and arranged with gaps between them and the inner peripheral side of the stator core. The two ends of the mounting bracket are fixed to the rotating shaft, and the middle is arranged with gaps between it and the rotating shaft to form a hollow structure.

[0018] The beneficial effects achieved by this invention are as follows:

[0019] In the motor spindle cooling device of the present invention, since the water cooling channels of the water cooling assembly are arranged along the outer periphery of the stator core, the outer periphery of the winding protrusion, the outer end side, and the inner periphery, and since the heat of the stator and rotor mainly comes from the motor windings and rotor components, the heat emitted by part of the motor windings inside the stator core (i.e., the internal winding portion) can be conducted through the stator core and the outer sleeve component to the side flow channel formed by the outer periphery of the outer sleeve component and the housing assembly, and carried away by the cooling liquids such as water, coolant, and cooling oil flowing from the inlet flow channel to the outlet flow channel in the side flow channel; the heat emitted by part of the motor windings at the front and rear ends of the stator core (i.e., the winding protrusions) can be conducted through the inner sleeve components at the front and rear ends to the end flow channels formed by the outer periphery, outer end, and inner periphery of the two inner sleeve components and the outer sleeve component, and carried away by the cooling liquids such as water, coolant, and cooling oil flowing from the inlet flow channel. As the water flows towards the outlet channel within the end channel, it carries away the heat, greatly reducing the heat of the winding protrusions. Simultaneously, the outer sleeve components located on the inner periphery of the winding protrusions at both ends can conduct the heat from the hot air after heat exchange with the rotor components to the end channel between the outer sleeve components and the inner sleeve components. This heat is then carried away by the cooling liquids such as water, coolant, and cooling oil as they flow from the inlet channel towards the outlet channel within this end channel. Thus, the main heat sources of the stator and rotor, namely the heat emitted by the motor windings and rotor components, are carried away by the cooling liquids such as water, coolant, and cooling oil flowing from the inlet channel towards the outlet channel within the water-cooled channel. This achieves heat dissipation for the stator and rotor assemblies, thereby preventing the heat from the stator and rotor assemblies from being conducted to the front or rear bearing assemblies, which could lead to overheating and ensure the driving performance of the motor spindle.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a motor spindle cooling device according to an embodiment of the present invention.

[0023] Figure 2 This is a cross-sectional view of a motor spindle cooling device according to an embodiment of the present invention.

[0024] Figure 3 This is an exploded view of a motor spindle cooling device according to an embodiment of the present invention.

[0025] Figure 4This is an exploded view of a water-cooling component according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the outer casing structure according to an embodiment of the present invention.

[0027] Figure 6 , Figure 7 This is a schematic diagram of the structure of an inner sleeve component according to an embodiment of the present invention.

[0028] Figure 8 This is an exploded view of a portion of the structure of a motor spindle cooling device according to an embodiment of the present invention.

[0029] Figure 9 This is an exploded view of the shaft and rear fan blade structure according to an embodiment of the present invention.

[0030] Reference numerals: stator assembly 10, stator core 11, motor winding 12, winding internal part 121, winding protrusion 122;

[0031] Rotor assembly 20, shaft 21, shoulder 211, rotor component 22, mounting bracket 221, magnet 222, hollow structure 223, front fan blade structure 23, front baffle 231, front fan blade component 232, front convex ring 233, rear fan blade structure 24, rear baffle 241, rear fan blade component 242, rear convex ring one 243, rear convex ring two 244;

[0032] Water-cooled assembly 30, outer sleeve component 31, first outer ring plate 311, second outer ring plate 312, third outer ring plate 313, toothed structure 3131, outer sleeve structure 314, ring cover plate 315, inner sleeve component 32, first inner ring plate 321, second inner ring plate 322, third inner ring plate 323, water-cooled flow channel 33, water inlet flow channel 331, water outlet flow channel 332, end flow channel 333, first surface flow channel 3331, first surface flow channel segment 1 3331a, first surface flow channel segment 2 3331b, second surface flow channel 3332, second surface flow channel segment 1 3332a, second surface flow channel segment 2 3332b, third surface flow channel 3333, third surface flow channel segment 1 3333a, third surface flow channel segment 2 3333b, side flow channel 334, first side flow channel 3341, second side flow channel 3342;

[0033] 40. Housing assembly; 41. Front air duct; 42. Rear air duct; 43. Housing body; 44. Front cover; 45. Rear cover;

[0034] Front bearing assembly 50; rear bearing assembly 60; front limiting component 70; rear limiting component 80; cable outlet channel 90. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0040] like Figures 1-9As shown in the figure, as an embodiment of the present invention, a motor spindle cooling device is provided, including a housing assembly 40, a stator assembly 10, a rotor assembly 20, and a water cooling assembly 30. The stator assembly 10 is arranged inside the housing assembly 40 and includes a hollow stator core 11 and a motor winding 12 disposed on the stator core 11. The motor winding 12 has a winding inner portion 121 disposed inside the stator core 11 and two winding protrusions 122 respectively protruding from the front and rear ends of the stator core 11. The rotor assembly 20 includes a rotating shaft 21 and a rotor member 22 sleeved and fixed on the rotating shaft 21 and disposed inside the stator core 11. The rotor member 22 can rotate under the action of the rotating magnetic field generated when the stator assembly 10 is energized, and drive the rotating shaft 21 to rotate synchronously, thereby directly driving the rotating shaft 21 to rotate at high speed. The front part of the housing assembly 40 is rotatably connected to the rotating shaft 21 via a front bearing assembly 50, and the rear part of the housing assembly 40 is rotatably connected to the rotating shaft 21 via a rear bearing assembly 60. This allows the rotating shaft 21 and the rotor component 22 to be supported within the housing assembly 40 by the front bearing assembly 50 and the rear bearing assembly 60, and to rotate relative to the housing assembly 40. The water-cooling assembly 30 is arranged within the housing assembly 40. The water-cooling assembly 30 includes a water-cooling channel 33, an outer sleeve component 31, and two inner sleeve components 32 that respectively enclose the two winding protrusions 122. The front end of the outer sleeve component 31 is arranged behind the front bearing assembly 50, and the rear end is arranged in front of the rear bearing assembly 60. In other words, the outer sleeve component 31, the inner sleeve component 32, the water-cooling channel 33, and the rotor component 22 are all arranged between the front bearing assembly 50 and the rear bearing assembly 60. The inner sleeve component 32 encloses the outer peripheral side, outer end face, and inner peripheral side of the winding protrusion 122. The outer sleeve component 31 encloses the outer peripheral side of the stator core 11, as well as the outer peripheral side, outer end face, and inner peripheral side of the two inner sleeve components 32. The water cooling channel 33 includes an inlet channel 331, an outlet channel 332, and an intermediate channel connecting the inlet channel 331 and the outlet channel 332. The intermediate channel includes two end channels 333 formed by the outer peripheral side, outer end face, and inner peripheral side of the two inner sleeve components 32 and the outer sleeve component 31, respectively, and a side channel 334 formed by the outer peripheral side of the outer sleeve component 31 and the housing assembly 40. The two end channels 333 are connected to the side channels 334.In this embodiment of the motor spindle cooling device, since the water cooling channels 33 of the water cooling assembly 30 are arranged along the outer periphery of the stator core 11, the outer periphery of the winding protrusion 122, the outer end side, and the inner periphery, and since the heat of the stator and rotor mainly comes from the motor winding 12 and the rotor component 22, the heat emitted by part of the motor winding inside the stator core 11, i.e., the winding internal part 121, can be conducted through the stator core 11 and the outer casing component 31 to the side flow channel 3 formed by the outer periphery of the outer casing component 31 and the housing assembly 40. The heat generated by the winding protrusion 122 is carried away by the water, coolant, and cooling oil as it flows from the inlet channel 331 towards the outlet channel 332 within the side channel 334, greatly reducing the heat. The heat emitted by the motor windings at both ends of the stator core 11, i.e., the winding protrusions 122, can be conducted through the inner sleeve members 32 at both ends to the end channels 333 formed by the outer peripheral sides, outer end faces, and inner peripheral sides of the two inner sleeve members 32 and the outer sleeve member 31, respectively. This heat is carried away by the water, coolant, and cooling oil as it flows from the inlet channel 331 towards the outlet channel 332. Cooling fluids such as cooling oil are carried away as they flow from the inlet channel 331 towards the outlet channel 332 within the end channel 333. Simultaneously, a portion of the outer sleeve member 31 located on the inner circumference of the winding protrusions 122 at both ends can conduct heat from the hot air after heat exchange with the rotor member 22 to the portion of the end channel 333 between itself and the inner sleeve member 32. This heat is then carried away by the cooling fluids such as water, coolant, and cooling oil as they flow from the inlet channel 331 towards the outlet channel 332 within this portion of the end channel 333. The water-cooling channel 33 can carry away the heat generated by the main heat sources of the stator and rotor, namely the motor windings 12 and the rotor assembly 22, by the flow of cooling liquids such as water, coolant, and cooling oil from the inlet channel 331 to the outlet channel 332 within the water-cooling channel 33. This achieves heat dissipation for the stator assembly 10 and the rotor assembly 20, thereby preventing the heat from the stator assembly 10 and the rotor assembly 20 from being conducted to the front bearing assembly 50 or the rear bearing assembly 60, which would cause the front bearing assembly 50 or the rear bearing assembly 60 to overheat, thus ensuring the driving performance of the motor spindle.

[0041] like Figure 4 , Figure 5As shown, in this embodiment, the side flow channel 334 includes a first side flow channel 3341 and a second side flow channel 3342. The inlet flow channel 331 is located at the rear of the outer casing 31 and is connected to the inlet end of the rear end flow channel 333. The outlet flow channel 332 is located at the rear of the outer casing 31. The rear end of the first side flow channel 3341 is connected to the outlet end of the rear end flow channel 333, and the front end is connected to the inlet end of the front end flow channel 333. The front end of the second side flow channel 3342 is connected to the outlet end of the front end flow channel 333, and the rear end is connected to the outlet flow channel 332. This allows the inlet flow channel 331 and the outlet flow channel 332 of the water cooling channel 33 to be located at the rear of the outer casing 31, facilitating the arrangement and connection of an external water source device on the same side of the motor spindle. In other embodiments, the inlet channel 331 can also be used as the outlet channel, and the outlet channel 332 can be used as the inlet channel for reverse flow. In this case, the outlet channel is set at the rear of the outer casing and connected to the outlet end of the rear end channel. The rear end of the first side channel is connected to the inlet channel and the front end is connected to the inlet end of the front end channel. The front end of the second side channel is connected to the outlet end of the front end channel and the rear end is connected to the inlet end of the rear end channel.

[0042] like Figure 5 As shown, in this embodiment, the first side flow channel 3341 and the second side flow channel 3342 are respectively configured as spiral channel structures arranged around the outer periphery of the stator core 11 between the outer periphery of the outer casing member 31 and the inner periphery of the housing assembly 40. The first side flow channel 3341 and the second side flow channel 3342 are arranged side-by-side along the same spiral direction, allowing the cooling liquid to flow more smoothly within them. Furthermore, the compact arrangement of the channels enables more rapid cooling of the heat emitted from the winding housing 121. In other embodiments, the first side flow channel 3341 and the second side flow channel 3342 may also be configured as an S-shaped channel structure or other shapes.

[0043] like Figure 4 , Figure 6As shown, in this embodiment, the inner sleeve component 32 includes a first inner ring plate 321 that wraps around the outer peripheral side of the winding protrusion 122, a second inner ring plate 322 that wraps around the outer end face of the winding protrusion 122, and a third inner ring plate 323 that wraps around the inner peripheral side of the winding protrusion 122. The outer sleeve component 31 includes a first outer ring plate 311 that wraps around the outer peripheral side of the stator core 11 and the outer peripheral side of the two inner sleeve components 32, two second outer ring plates 312 that respectively wrap around the outer end faces of the two inner sleeve components 32, and two third outer ring plates 313 that respectively wrap around the inner peripheral side of the two inner sleeve components 32. The outer peripheral side of the first outer ring plate 311 is fitted and fixed relative to the inner peripheral side of the housing assembly 40, such as by using an interference fit. The end flow channel 333 includes a first surface flow channel 3331 formed by the first outer ring plate 311 and the first inner ring plate 321, a second surface flow channel 3332 formed by the second outer ring plate 312 and the second inner ring plate 322, and a third surface flow channel 3333 formed by the third outer ring plate 313 and the third inner ring plate 323. The cooling liquid in the first surface flow channel 3331, the second surface flow channel 3332, and the third surface flow channel 3333 respectively carries away the heat emitted from the outer peripheral side, outer end face, and inner peripheral side of the winding protrusion 122, thereby achieving rapid cooling and heat dissipation of the winding protrusion 122. At the same time, the third surface flow channel 3333 can carry away the heat of the hot air around the third outer ring plate 313 after heat exchange with the rotor component 22, thereby achieving heat dissipation of the rotor component 22. In addition, the inlet and outlet ends of the two end channels 333 are both set on their first surface channels 3331, which facilitates the arrangement of the inlet channel 331 and the outlet channel 332 at the rear of the outer casing 31, and facilitates the arrangement of the first side channel 3341 and the second side channel 3342 at the front of the outer casing 31 to connect with the inlet and outlet ends of the end channels 333 respectively.

[0044] like Figure 6As shown, in this embodiment, the first flow channel 3331 includes a first flow channel segment 3331a connected to the inlet end of its end flow channel 333, and a second flow channel segment 3331b connected to the outlet end of its end flow channel 333. The first flow channel segment 3331a and the second flow channel segment 3331b are respectively arranged around the outer peripheral side of the winding protrusion 122 between the two sides of the first inner ring plate 321 and the first outer ring plate 311. The second flow channel 3332 includes a second flow channel segment 3332a connected to the outlet end of the first flow channel segment 3331a, and a second flow channel segment 3332b connected to the inlet end of the second flow channel segment 3331b. The second flow channel segment 3332a and the second flow channel segment 3332b are respectively arranged around the outer end face of the winding protrusion 122 between the two sides of the second inner ring plate 322 and the second outer ring plate 312. The third flow channel 3333 includes a third flow channel section 3333a connected to the outlet end of the second flow channel section 3332a and a third flow channel section 3333b connected to the inlet end of the second flow channel section 3332b. The third flow channel sections 3333a and 3333b are respectively arranged around the inner circumferential side of the winding protrusion 122 between the two sides of the third inner ring plate 323 and the third outer ring plate 313. The outlet end of the third flow channel section 3333a is connected to the inlet end of the third flow channel section 3333b. This allows the cooling liquid to flow from the inlet channel 331 through the first surface flow channel section 3331a, the second surface flow channel section 3332a, the third surface flow channel section 3333a, the third surface flow channel section 3333b, the second surface flow channel section 3332b, and the first surface flow channel section 3331b of the rear end flow channel 333 into the inlet end of the first side flow channel 3341. Then, from the outlet end of the first side flow channel 3341, it flows through the first surface flow channel section 3331a, the second surface flow channel section 3332a, the third surface flow channel section 3333a, the third surface flow channel section 3333b, the second surface flow channel section 3332b, and the first surface flow channel section 3331b of the front end flow channel 333 into the inlet end of the second side flow channel 3342. Finally, it flows from the outlet end of the second side flow channel 3342 into the outlet flow channel 332. In this embodiment, a portion of the first side flow channel 3341 is disposed on the outer casing member 31, and another portion of the flow channel is disposed on the housing assembly 40 and connected to a portion of the flow channel on the outer casing member 31. A portion of the second side flow channel 3342 is disposed on the outer casing member 31, and another portion of the flow channel is disposed on the housing assembly 40 and connected to a portion of the flow channel on the outer casing member 31. The first side flow channel 3341 and the second side flow channel 3342 on the housing assembly 40 are connected to an external water source device, facilitating the connection of an external water source device.

[0045] like Figure 6 , Figure 7As shown, in this embodiment, the first flow channel section 3331a includes two first semi-ring sections arranged side by side along the axial direction of the stator core 11, and a first return section connecting the ends of the two first semi-ring sections away from the inlet flow channel 331. The second flow channel section 3331b includes two first semi-ring sections arranged side by side along the axial direction of the stator core 11, and a third return section connecting the ends of the two first semi-ring sections away from the outlet flow channel 332. The inlet end of the first flow channel section 3331a and the outlet end of the second flow channel section 3331b are arranged opposite each other with a gap, and the outlet end of the first flow channel section 3331a and the inlet end of the second flow channel section 3331b are arranged opposite each other with a gap. The first return section and the first return section are arranged opposite each other. The first flow channel section 3331a and the second flow channel section 3331b are arranged closely on the outer periphery of the winding protrusion 122, and are respectively set as a double-layer flow channel structure arranged along the axial direction of the stator core 11. This greatly increases the cooling and heat dissipation area on the outer periphery of the winding protrusion 122, which is more conducive to heat dissipation on the outer periphery of the winding protrusion 122. In addition, the space arrangement between the water inlet and water outlet of the first flow channel section 3331a and the water outlet and water inlet of the second flow channel section 3331b is more compact, which is also conducive to the overall path arrangement of the end flow channel 333.

[0046] In this embodiment, the second flow channel section 3332a includes two second semi-ring sections 1 arranged radially side by side along the stator core 11, and a second return section 1 connecting the ends of the two second semi-ring sections 1 away from the water inlet end of the second flow channel section 1. The second flow channel section 3332b includes two first semi-ring sections 2 arranged radially side by side along the stator core 11, and a second return section 2 connecting the ends of the two second semi-ring sections 2 away from the water outlet end of the second flow channel section 2. The water inlet end of the second flow channel section 3332a and the water outlet end of the second flow channel section 3332b are arranged opposite each other with a gap, and the water outlet end of the second flow channel section 3332a and the water inlet end of the second flow channel section 3332b are arranged opposite each other with a gap. The second return section 1 and the second return section 2 are arranged opposite each other. The second flow channel section 3332a and the second flow channel section 3332b are arranged closely on the outer end side of the winding protrusion 122, and are respectively set as a double-layer flow channel structure arranged radially along the stator core 11. This greatly increases the cooling and heat dissipation area on the outer end side of the winding protrusion 122, which is more conducive to heat dissipation on the outer end side of the winding protrusion 122. In addition, the space arrangement between the water inlet and water outlet of the second flow channel section 3332a and the water outlet and water inlet of the second flow channel section 3332b is more compact, which is also conducive to the overall path arrangement of the end flow channel 333.

[0047] In this embodiment, the third flow channel section 3333a includes two third semi-ring sections 1 arranged side by side along the axial direction of the stator core 11, and a third return section 1 connected between the ends of the two third semi-ring sections 1 away from the water inlet end of the third flow channel section 1. The third flow channel section 3333b includes two third semi-ring sections 2 arranged side by side along the axial direction of the stator core 11, and a third return section 2 connected between the ends of the two third semi-ring sections 2 away from the water outlet end of the third flow channel section 2. The water inlet end of the third flow channel section 3333a and the water outlet end of the third flow channel section 3333b are arranged opposite each other with a gap, the water outlet end of the third flow channel section 3333a is connected to the water inlet end of the third flow channel section 3333b, and the third return section 1 and the third return section 2 are arranged opposite each other. The third flow channel section 3333a and the second flow channel section 3333b are arranged closely on the inner circumference of the winding protrusion 122 and are respectively configured as a double-layer flow channel structure arranged along the axial direction of the stator core 11. This greatly increases the cooling and heat dissipation area on the inner circumference of the winding protrusion 122, which is more conducive to heat dissipation on the inner circumference of the winding protrusion 122 and the rotor component 22. In addition, the space arrangement of the water inlet end of the third flow channel section 3333a and the water outlet end of the third flow channel section 3333b is more compact, which is also conducive to the overall path arrangement of the end flow channel 333.

[0048] In this embodiment, the inlet end of the first flow channel section 3331a is located on the front side of the first semi-ring section, away from the first return flow section, and the outlet end is located on the rear side of the first semi-ring section, away from the first return flow section. The inlet end of the second flow channel section 3331b is located on the rear side of the first semi-ring section, away from the first return flow section, and the outlet end is located on the front side of the first semi-ring section, away from the first return flow section. The inlet end of the second flow channel section 3332a is located on the outer side of the first semi-ring section, away from the second return flow section, and the outlet end is located on the inner side of the second semi-ring section, away from the second return flow section. The inlet end of the second flow channel section 3332b is located on the inner side of the second semi-ring section, away from the second return flow section, and the outlet end is located on the outer side of the second semi-ring section, away from the second return flow section. The inlet of the third flow channel section 3333a is located on the rear side of the third semi-ring section, away from the third return section, and the outlet is located on the front side of the third semi-ring section, away from the third return section. The inlet of the second flow channel section 3333b is located on the front side of the third semi-ring section, away from the third return section, and the outlet is located on the rear side of the third semi-ring section, away from the third return section. The structural arrangement is simple and ingenious.

[0049] like Figure 4As shown, in this embodiment, the outer peripheral surface of the outer sleeve member 31, and the outer peripheral surface, outer end surface, and inner peripheral surface of the two inner sleeve members 32 are respectively provided with recessed flow channel grooves corresponding to the water cooling channel 33. The inner peripheral surface of the housing assembly 40 and the surfaces on the outer sleeve member 31 that are arranged opposite to the outer peripheral side, outer end side, and inner peripheral side of the inner sleeve member 32 are respectively set as smooth surfaces. After the outer sleeve member 31 is connected to the housing assembly 40 and connected to the two inner sleeve members 32, the flow channel groove surrounds each smooth surface to form the water cooling channel 33. Compared with setting the water cooling channel 33 to be formed by the flow channel grooves on the outer sleeve member 31 and the housing assembly 40 respectively arranged opposite to each other, and the flow channel grooves on the outer sleeve member 31 and the two inner sleeve members 32, it can avoid the failure of the water cooling channel 33 assembly due to installation misalignment.

[0050] In this embodiment, the inlet and outlet ends of the first side channel 3341 are respectively disposed through the inner peripheral sidewall of the outer sleeve member 31, and the inlet end of the first side channel 3341 is connected to the outlet end of the rear end channel 333, while the outlet end of the first side channel 3341 is connected to the inlet end of the front end channel 333. The inlet and outlet ends of the second side channel 3342 are respectively disposed through the inner peripheral sidewall of the outer sleeve member 31, and the inlet end of the second side channel 3342 is connected to the outlet end of the front end channel 333, while the outlet end of the second side channel 3342 is connected to the outlet channel 332. The outlet end of the inlet channel 331 is disposed through the inner peripheral sidewall of the outer sleeve member 31, and the outlet end of the inlet channel 331 is connected to the inlet end of the rear end channel 333. The inlet channel 331 and the outlet channel 332 pass through the rear end of the first outer ring plate 311 and the rear end of the housing assembly 40 along the axial direction of the stator core 11, respectively. The outlet end of the first channel section 3331a and the inlet end of the second channel section 3332a are formed by a corner notch that passes through the first inner ring plate 321 away from the stator core 11 and the outer peripheral edge of the second inner ring plate 322, and are surrounded by the first outer ring plate 311 away from the stator core 11 and the outer peripheral edge of the second outer ring plate 312. The inlet end of the first channel section 3331b and the outlet end of the second channel section 3332b are formed by a corner notch that passes through the first inner ring plate 321 away from the stator core 11 and the outer peripheral edge of the second inner ring plate 322, and are surrounded by the first outer ring plate 311 away from the stator core 11 and the outer peripheral edge of the second outer ring plate 312. The outlet end of the second flow channel section 3332a and the inlet end of the third flow channel section 3333a are formed by a notch that penetrates the third inner ring plate 323 away from the stator core 11 and the inner peripheral side edge of the second inner ring plate 322, and are surrounded by the third outer ring plate 313 away from the stator core 11 and the inner peripheral side edge of the second outer ring plate 312. The inlet end of the second flow channel section 3332b and the outlet end of the third flow channel section 3333b are formed by a notch that penetrates the third inner ring plate 323 away from the stator core 11 and the inner peripheral side edge of the second inner ring plate 322, and are surrounded by the third outer ring plate 313 away from the stator core 11 and the inner peripheral side edge of the second outer ring plate 312.

[0051] In this embodiment, the rear end of the housing assembly 40, the rear second outer ring plate 312, and the rear second inner ring plate 322 are provided with a wire outlet channel 90 for conductive wires to pass through the housing assembly 40. Among them, part of the wire outlet channel 90 on the rear second inner ring plate 322 is arranged between the second return section one and the second return section two.

[0052] like Figure 2 , Figure 4As shown, in this embodiment, the outer sleeve component 31 includes an outer sleeve structure 314 and an annular cover plate 315. The first outer ring plate 311, the second outer ring plate 312 at the rear end, and the third outer ring plate 313 at the rear end of the outer sleeve component 31 are formed by the outer sleeve structure 314. The second outer ring plate 312 at the front end and the third outer ring plate 313 at the front end of the outer sleeve component 31 are formed by the annular cover plate 315. The front end of the outer sleeve structure 314 forms an installation channel for assembling the two inner sleeve components 32, the stator core 11, and the motor winding 12 within it, facilitating assembly and production. The two inner sleeve components 32 are respectively interference-fitted to the outer sleeve component 31, and the outer sleeve component 31 is interference-fitted to the housing assembly 40, improving connection stability and the sealing performance of the water-cooled flow channel 33. The two inner sleeve components 32 and the ring cover plate 315 are made of aluminum, which has good heat transfer performance. This facilitates the rapid absorption of heat emitted by the winding protrusion 122 and the heat of the hot air after heat exchange with the rotor component 22 on the inner circumference of the front ring cover plate 315, and conducts it to the cooling liquid flowing in the water cooling channel 33 to carry it away. This improves the heat dissipation efficiency of the stator assembly 10 and the rotor assembly 20, greatly reduces the heat conducted to the front bearing assembly 50 or the rear bearing assembly 60, avoids overheating of the front bearing assembly 50 or the rear bearing assembly 60, and ensures the driving performance of the motor spindle.

[0053] like Figure 4 As shown, in this embodiment, the inner circumferential surface of the third outer ring plate 313 of the outer sleeve member 31 (i.e., the ring cover plate 315) on the inner circumferential side of the front winding protrusion 122 is recessed with several toothed groove structures 3131, and the inner circumferential surface of the third outer ring plate 313 of the outer sleeve member 31 (i.e., the outer sleeve structure 314) on the inner circumferential side of the rear winding protrusion 122 is also recessed with several toothed groove structures 3131. In this embodiment, the several toothed groove structures 3131 combine to form a sawtooth groove shape structure, which greatly increases the contact area between the third outer ring plate 313 and the hot air on its inner circumferential side, which is more conducive to fully absorbing the heat of the hot air and facilitating heat dissipation for the rotor member 22.

[0054] like Figure 2As shown, in this embodiment, the rotor component 22 includes a mounting bracket 221 that is sleeved and fixed on the rotating shaft 21, and a plurality of magnet steel sheets 222 that are fixed to the outer peripheral side of the mounting bracket 221 and arranged with a gap between the magnet steel sheets 222 and the inner peripheral side of the stator core 11. The mounting bracket 221 can be interference-fitted to the rotating shaft 21 and sleeved and fixed to the rotating shaft 21. The magnet steel sheets 222 can rotate under the action of the rotating magnetic field generated when the stator assembly 10 is energized, and drive the mounting bracket 221 and the rotating shaft 21 to rotate synchronously. The mounting bracket 221 is fixed to the rotating shaft 21 at both ends and spaced apart from the rotating shaft 21 in the middle to form a hollow structure 223. The hollow structure 223 greatly reduces the contact area between the mounting bracket 221 and the rotating shaft 21, thereby reducing the heat from the magnet 222 transmitted to the rotating shaft 21 via the mounting bracket 221. On the one hand, this prevents the rotating shaft 21 from overheating; on the other hand, it also reduces the heat emitted by the rotor component 22 from being conducted to the front bearing assembly 50 or the rear bearing assembly 60 via the rotating shaft 21, further preventing the front bearing assembly 50 or the rear bearing assembly 60 from overheating. In addition, the outer surface of the rotating shaft 21 and the inner surface of the mounting bracket 221 are coated with a heat insulation layer, further reducing the heat conduction from the mounting bracket 221 to the rotating shaft 21.

[0055] like Figure 8 , Figure 9 As shown, in this embodiment, a front fan blade structure 23 is provided on the rotating shaft 21 between the rear side of the front bearing assembly 50 and the front end of the outer sleeve member 31. The front fan blade structure 23 can fan the hot air at the front end of the rotor member 22 towards the surface of the toothed groove structure 3131 on the inner circumference side of the outer sleeve member 31, i.e., the third outer ring plate 313, arranged on the inner circumference side of the front winding protrusion 122, thereby guiding the hot air at the front end of the rotor member 22 after heat exchange with the rotor member 22 to flow towards the third outer ring plate 313 at the front end. This facilitates the third outer ring plate 313 at the front end to fully absorb the heat of the hot air and conduct the heat to the cooling liquid in the third surface flow channel 3333 formed between the third outer ring plate 313 and the third inner ring plate 323 at the front end.

[0056] In this embodiment, a rear fan blade structure 24 is provided on the rotating shaft 21 between the front side of the rear bearing assembly 60 and the rear end of the outer sleeve member 31. The rear fan blade structure 24 can fan the hot air at the rear end of the rotor member 22 towards the surface of the toothed structure 3131 on the inner circumference side of the outer sleeve member 31, i.e., the third outer ring plate 313, arranged on the inner circumference side of the rear winding protrusion 122, thereby guiding the hot air at the rear end of the rotor member 22 after heat exchange with the rotor member 22 to flow towards the rear end third outer ring plate 313. This facilitates the rear end third outer ring plate 313 to fully absorb the heat of the hot air and conduct the heat to the cooling liquid in the third surface flow channel 3333 formed between the rear end third outer ring plate 313 and the third inner ring plate 323.

[0057] like Figure 2 As shown, in this embodiment, the housing assembly 40 is provided with a main chamber, a front chamber arranged in front of the main chamber and communicating with the main chamber, and a rear chamber arranged in rear of the main chamber and communicating with the main chamber. The stator core 11, motor winding 12, rotor component 22 and water cooling assembly 30 are arranged in the main chamber, and the front end face of the outer sleeve component 31, i.e. the front end face of the second outer ring plate 312, is attached to the front side wall of the main chamber, and the rear end face is attached to the rear side wall of the main chamber. The front bearing assembly 50 and the front fan blade structure 23 are arranged in the front chamber. The front chamber, the front fan blade structure 23, and the outer sleeve member 31 (i.e., the third outer ring plate 313 at the front end) on the inner circumference of the front winding protrusion 122 form a front air duct 41 arranged on the outer circumference of the rotating shaft 21. This facilitates the hot air at the front end of the rotor component 22 driven by the front fan blade structure 23 to gather and flow in the front air duct 41, making it easier for the third outer ring plate 313 at the front end to fully absorb the heat of the hot air at the front end. At the same time, the hot air in the front air duct 41 can also be blocked by the front fan blade structure 23 at the rear side of the front fan blade structure 23, greatly reducing the amount of hot air flowing to the front bearing assembly 50. In addition, since the front end face of the outer sleeve member 31 (i.e., the front third outer ring plate 313) is... The front end face of the second outer ring plate 312 is arranged in close contact with the front side wall of the main chamber. On the one hand, it can block the hot air in the front air duct 41 from the front third outer ring plate 313 and the inner peripheral side wall of the front chamber, preventing the hot air from flowing into the gap between the front second outer ring plate 312 and the front side wall of the main chamber and conducting the heat to the front bearing assembly 50 through the front side wall of the main chamber. On the other hand, it can also conduct the heat of the front side wall of the main chamber to the cooling liquid in the second flow channel 3332 formed between the front second outer ring plate 312 and the second inner ring plate 322, thereby reducing the heat of the front side wall of the main chamber and thus reducing the heat conducted to the front bearing assembly 50 by the front side wall of the main chamber.

[0058] In this embodiment, the rear bearing assembly 60 and the rear fan blade structure 24 are arranged in the rear chamber. The rear chamber, the rear fan blade structure 24, and the outer sleeve member 31 on the inner periphery of the rear winding protrusion 122, i.e., the third outer ring plate 313 at the rear end, surround each other to form a rear air duct 42 arranged on the outer periphery of the rotating shaft 21. This facilitates the rear fan blade structure 24 to fan the hot air at the rear end of the rotor component 22, which then flows within the rear air duct 42. This allows the third outer ring plate 313 at the rear end to fully absorb the heat from the hot air at the rear end. At the same time, the hot air in the rear air duct 42 can also be blocked by the rear fan blade structure 24 at its rear side, greatly reducing the amount of hot air flowing from the rear air duct 42 to the rear bearing assembly 60. In addition, due to the rear of the outer sleeve member 31... The rear end face of the second outer ring plate 312 is arranged in close contact with the rear side wall of the main chamber. On the one hand, it can block the hot air in the rear air duct 42 from the third outer ring plate 313 and the inner circumferential side wall of the rear chamber, preventing the hot air from flowing into the gap between the second outer ring plate 312 and the rear side wall of the main chamber and conducting heat to the rear bearing assembly 60 through the rear side wall of the main chamber. On the other hand, it can also conduct the heat of the rear side wall of the main chamber to the cooling liquid in the second flow channel 3332 formed between the second outer ring plate 312 and the second inner ring plate 322, thereby reducing the heat of the rear side wall of the main chamber and thus reducing the heat conducted to the rear bearing assembly 60 by the rear side wall of the main chamber.

[0059] like Figure 8 , Figure 9 As shown, in this embodiment, the front fan blade structure 23 includes a front baffle 231 and a plurality of front fan blades 232 protruding from the rear side of the front baffle 231. The front fan blades 232 can rotate synchronously with the rotating shaft 21 to fan the hot air in the front air duct 41 along the inner sidewall of the front air duct 41 toward the toothed structure 3131 on the front third outer ring plate 313. The outer peripheral sidewall of the front baffle 231 is arranged with a gap from the inner peripheral sidewall of the front chamber, thereby ensuring that the front baffle 231 can rotate relative to the front chamber with the rotating shaft 21, and also blocking the hot air in the front air duct 41 from flowing toward the front bearing assembly 50. The front fan blade structure 23 and the rotating shaft 21 are integrally formed and connected firmly.

[0060] In this embodiment, the rear fan blade structure 24 includes a rear baffle 241 and a plurality of rear fan blades 242 protruding from the front side of the rear baffle 241. The rear fan blades 242 can rotate synchronously with the rotating shaft 21 to fan the hot air in the rear air duct 42 along the inner sidewall of the rear air duct 42 toward the toothed structure 3131 on the third outer ring plate 313 at the rear end. The outer peripheral sidewall of the rear baffle 241 is arranged with a gap to the inner peripheral sidewall of the rear chamber, so that while ensuring that the rear baffle 241 can rotate relative to the rear chamber with the rotating shaft 21, it can also block the hot air in the rear air duct 42 from flowing toward the rear bearing assembly 60. The rear fan blade structure 24 is set as an independent structure and is interference-fitted with the rotating shaft 21, which facilitates the assembly of the rotor component 22 on the rotating shaft 21 via the rear end of the rotating shaft 21.

[0061] In this embodiment, the front fan blade structure 23 further includes a front protruding ring 233 protruding from the front side of the front partition plate 231 and abutting against the inner ring of the bearing of the front bearing assembly 50. The front sidewall of the front chamber is provided with a front limiting member 70 arranged at the front end of the front bearing assembly 50 and abutting against the inner ring of the bearing of the front bearing assembly 50. The rotating shaft 21 is rotatably sleeved in the front limiting member 70. The inner ring of the bearing of the front bearing assembly 50 is axially supported between the front protruding ring 233 and the front limiting member 70. The outer ring of the bearing of the front bearing assembly 50 is axially supported between the front sidewall and the rear sidewall of the front chamber. The front bearing assembly 50 is radially supported between the inner peripheral sidewall of the front chamber and the outer peripheral sidewall of the rotating shaft 21.

[0062] In this embodiment, the rear part of the rotating shaft 21 is provided with a shoulder 211 arranged toward the rear end of the rotating shaft. The rear fan blade structure 24 also includes a rear protruding ring 243 protruding on the rear side of the rear partition 241 and abutting against the inner ring of the bearing of the rear bearing assembly 60, and a rear protruding ring 244 protruding on the front side of the rear partition 241 and abutting against the rear end face of the shoulder 211. Each rear fan blade 242 is arranged on the outer periphery of the rear protruding ring 244. The rear sidewall of the rear chamber is provided with a rear limiting member 80, which is arranged at the rear end of the rear bearing assembly 60 and abuts against the inner ring of the bearing of the rear bearing assembly 60. The rotating shaft 21 is rotatably sleeved in the rear limiting member 80. The inner ring of the bearing of the rear bearing assembly 60 is axially supported between the rear convex ring 243 and the rear limiting member 80. The outer ring of the bearing of the rear bearing assembly 60 is axially supported on the front side of the rear sidewall of the rear chamber. The rear bearing assembly 60 is radially supported between the inner circumferential sidewall of the rear chamber and the outer circumferential sidewall of the rotating shaft 21.

[0063] like Figure 2 , Figure 3As shown, in this embodiment, the front bearing assembly 50 and the rear bearing assembly 60 each include two bearings arranged axially along the stator core 11, and a bearing retaining ring arranged between the two bearings, resulting in a stable connection that facilitates the stable operation of the rotating shaft 21. The front limiting member 70 and the rear limiting member 80 are configured as bearing locking nuts, capable of axially securing and locking the front bearing assembly 50 and the rear bearing assembly 60. In other embodiments, the front limiting member 70 or the rear limiting member 80 may also be configured as a limiting ring or other structures capable of axial limiting.

[0064] like Figure 2 As shown, in this embodiment, the housing assembly 40 includes a housing body 43, a front cover 44 connected to the front end of the housing body 43, and a rear cover 45 connected to the rear end of the housing body 43. The main chamber is formed in the middle area inside the housing body 43. The inner peripheral side and front wall of the main chamber are formed by the housing body 43, and the rear wall of the main chamber is formed by the rear cover 45, so as to form an installation channel at the rear end of the housing body 43 for the stator assembly 10 and the water cooling assembly 30 to extend into the main chamber. The front chamber is formed by the front end area of ​​the housing body 43 and the front cover 44. The inner peripheral side and rear wall of the front chamber are formed by the housing body 43, and the front side wall of the front chamber is formed by the front cover 44, so as to form an installation channel at the front end of the housing body 43 for the front bearing assembly 50 to extend into the front chamber. The rear chamber is formed by the rear cover 45, and the front cover 44 and the housing body 43, as well as the rear cover 45 and the housing body 43, are respectively locked and connected by fasteners such as screws and bolts, which facilitates assembly and production.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0066] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. A motor spindle cooling device, characterized in that, include: Housing components; The stator assembly, arranged within the housing assembly, includes a hollow stator core and a motor winding disposed on the stator core. The motor winding has a winding housing portion disposed within the stator core and two winding protrusions protruding from the front and rear ends of the stator core, respectively. The rotor assembly includes a rotating shaft and a rotor component sleeved and fixed on the rotating shaft and arranged inside the stator core. The front part of the housing assembly is rotatably connected to the rotating shaft through a front bearing assembly, and the rear part of the housing assembly is rotatably connected to the rotating shaft through a rear bearing assembly. A water-cooled assembly, arranged within the housing assembly, includes a water-cooling channel, an outer sleeve member, and two inner sleeve members that respectively enclose the two winding protrusions. The front end of the outer sleeve member is arranged behind the front bearing assembly, and the rear end is arranged in front of the rear bearing assembly. The inner sleeve member encloses the outer peripheral side, outer end face, and inner peripheral side of the winding protrusions. The outer sleeve member encloses the outer peripheral side of the stator core, as well as the outer peripheral side, outer end face, and inner peripheral side of the two inner sleeve members. The water-cooling channel includes an inlet channel, an outlet channel, and an intermediate channel connecting the inlet channel and the outlet channel. The intermediate channel includes two end channels formed by the outer peripheral side, outer end face, and inner peripheral side of the two inner sleeve members surrounding the outer sleeve member, and a side channel formed by the outer peripheral side of the outer sleeve member surrounding the housing assembly. The two end channels are respectively connected to the side channels. The inner sleeve component includes a first inner ring plate that wraps around the outer peripheral side of the winding protrusion, a second inner ring plate that wraps around the outer end face of the winding protrusion, and a third inner ring plate that wraps around the inner peripheral side of the winding protrusion. The outer casing component includes a first outer ring plate that wraps around the outer periphery of the stator core and the outer periphery of the two inner casing components, two second outer ring plates that wrap around the outer end faces of the two inner casing components respectively, and two third outer ring plates that wrap around the inner periphery of the two inner casing components respectively. The outer periphery of the first outer ring plate is fitted and fixed to the inner periphery of the housing assembly. The end flow channel includes a first surface flow channel formed by a first outer ring plate and a first inner ring plate, a second surface flow channel formed by a second outer ring plate and a second inner ring plate, and a third surface flow channel formed by a third outer ring plate and a third inner ring plate. The inlet and outlet ends of both end flow channels are located on their first surface flow channels.

2. The motor spindle cooling device according to claim 1, characterized in that: The side flow channel includes a first side flow channel and a second side flow channel. The inlet flow channel is located at the rear of the outer casing and connected to the inlet end of the end flow channel at the rear end. The outlet flow channel is located at the rear of the outer casing. The rear end of the first side flow channel is connected to the outlet end of the end flow channel at the rear end, and the front end is connected to the inlet end of the end flow channel at the front end. The front end of the second side flow channel is connected to the outlet end of the end flow channel at the front end, and the rear end is connected to the outlet flow channel at the rear end. Or, The side flow channel includes a first side flow channel and a second side flow channel. The inlet flow channel is located at the rear of the outer casing member, and the outlet flow channel is located at the rear of the outer casing member and connected to the outlet end of the end flow channel at the rear end. The rear end of the first side flow channel is connected to the inlet flow channel, and the front end is connected to the inlet end of the end flow channel at the front end. The front end of the second side flow channel is connected to the outlet end of the end flow channel at the front end, and the rear end is connected to the inlet end of the end flow channel at the rear end.

3. The motor spindle cooling device according to claim 2, characterized in that: The first side flow channel and the second side flow channel are respectively configured as spiral channel structures arranged around the outer periphery of the stator core between the outer periphery of the outer casing component and the inner periphery of the housing assembly, and the first side flow channel and the second side flow channel are arranged side by side along the same spiral direction.

4. The motor spindle cooling device according to claim 1, characterized in that: The first flow channel includes a first flow channel section one connected to the water inlet end of its end flow channel and a first flow channel section two connected to the water outlet end of its end flow channel. The first flow channel section one and the first flow channel section two are respectively arranged around the outer peripheral side of the winding protrusion between the two sides of the first inner ring plate and the first outer ring plate. The second flow channel includes a second flow channel section one connected to the outlet end of the first flow channel section one, and a second flow channel section two connected to the inlet end of the first flow channel section two. The second flow channel section one and the second flow channel section two are respectively arranged around the outer end face of the winding protrusion between the two sides of the second inner ring plate and the second outer ring plate. The third flow channel includes a third flow channel section one connected to the outlet end of the second flow channel section one, and a third flow channel section two connected to the inlet end of the second flow channel section two. The third flow channel section one and the third flow channel section two are respectively arranged around the inner circumferential side of the winding protrusion between the two sides of the third inner ring plate and the third outer ring plate. The outlet end of the third flow channel section one is connected to the inlet end of the third flow channel section two.

5. The motor spindle cooling device according to claim 4, characterized in that: The third flow channel section includes two third semi-ring sections arranged side by side along the axial direction of the stator core, and a third return section connected between the ends of the two third semi-ring sections away from the water inlet end of the third flow channel section. The third flow channel section two includes two third semi-ring sections two arranged side by side along the axial direction of the stator core, and a third return section two connected between the ends of the two third semi-ring sections two away from the outlet end of the third flow channel section two; The inlet end of the third flow channel section one and the outlet end of the third flow channel section two are arranged opposite each other with a gap, and the outlet end of the third flow channel section one is connected to the inlet end of the third flow channel section two.

6. The motor spindle cooling device according to any one of claims 1-5, characterized in that: The rotating shaft is provided with a front fan blade structure arranged between the rear side of the front bearing assembly and the front end of the outer sleeve component. The front fan blade structure can fan the hot air at the front end of the rotor component toward the surface of a portion of the outer sleeve component arranged on the inner circumference side of the front winding protrusion as the rotating shaft rotates; and / or The rotating shaft is provided with a rear fan blade structure arranged between the front side of the rear bearing assembly and the rear end of the outer sleeve component. The rear fan blade structure can fan the hot air at the rear end of the rotor component to flow towards the surface of a portion of the outer sleeve component arranged on the inner circumference side of the rear winding protrusion as the rotating shaft rotates.

7. The motor spindle cooling device according to claim 6, characterized in that: The housing assembly is provided with a main chamber, a front chamber located in front of the main chamber and communicating with the main chamber, and a rear chamber located in rear of the main chamber and communicating with the main chamber. The stator core, motor windings, rotor components and water cooling assembly are arranged in the main chamber, and the front end face of the outer casing is attached to the front side wall of the main chamber and the rear end face is attached to the rear side wall of the main chamber. The front bearing assembly and the front fan blade structure are arranged in the front chamber, and the front chamber, the front fan blade structure and a portion of the outer sleeve member on the inner circumferential side of the front winding protrusion form a front air duct arranged on the outer circumferential side of the rotating shaft. The rear bearing assembly and the rear fan blade structure are arranged in the rear chamber. The rear chamber, the rear fan blade structure, and a portion of the outer sleeve member on the inner circumference of the rear winding protrusion surround each other to form a rear air duct arranged on the outer circumference of the rotating shaft.

8. The motor spindle cooling device according to claim 6, characterized in that: The inner circumferential surface of a portion of the outer sleeve member on the inner circumferential side of the protruding part of the front winding is recessed with a number of toothed groove structures, and the inner circumferential surface of a portion of the outer sleeve member on the inner circumferential side of the protruding part of the rear winding is recessed with a number of toothed groove structures.

9. The motor spindle cooling device according to claim 6, characterized in that: The rotor component includes a mounting bracket sleeved and fixed on the rotating shaft, and several magnetic steel sheets fixed to the outer peripheral side of the mounting bracket and arranged with gaps between them and the inner peripheral side of the stator core. The two ends of the mounting bracket are fixed to the rotating shaft, and the middle is arranged with gaps between it and the rotating shaft to form a hollow structure.

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