Motor and frame thereof

Abstract

The utility model provides a motor and a frame thereof. The motor includes a rotor, a stator, a bearing, and a frame. The rotor comprises an output shaft extending in the axial direction. The stator is disposed around the rotor. And the bearing is sleeved with a shaft. The frame body comprises a containing space, an inner frame and an outer frame. The accommodating space is configured to accommodate the rotor and the stator. The inner frame surrounds the accommodating space and comprises an outer wall, a flow channel and a bearing hole. The flow channel is recessed from the outer wall, the bearing hole accommodates the bearing, and the flow channel and the bearing hole are at least partially overlapped upwards from a radial view angle. The outer frame sleeves the outer wall of the inner frame.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor structure, in particular to a liquid-cooled motor with a flow channel formed in a frame and the frame thereof. BACKGROUND

[0002] In the current semiconductor process, photoresist is uniformly coated on the surface by rotating the wafer driven by a motor. In this process, the bearing at the out shaft end of the motor will generate friction heat due to rotation, which will cause the temperature of the out shaft to rise. Therefore, the temperature of the out shaft of the motor must be precisely controlled, otherwise it will have a negative impact on the coating quality of the photoresist. In the known technology, the motor is provided with a stainless steel tube as a flow channel inside, and the temperature of the out shaft is controlled by liquid cooling to dissipate heat. The manufacturing method of such a motor is to bend the stainless steel tube and install it to the inner frame, then cast the outer frame with a mold to complete the frame, and finally assemble the front end cover with bearings with the frame to form the motor.

[0003] However, the flow channel heat dissipation area of the stainless steel tube is limited by its bending radius, and the cross-sectional shape of the flow channel cannot be changed and adjusted to optimize the heat conduction path. Moreover, since the frame provided with the stainless steel tube and the front end cover provided with the bearings are separate components, there will be a contact thermal resistance between them, which will cause the friction heat of the bearings to be unable to be effectively conducted to the flow channel through the bearings and dissipated. The sealing design between the frame and the front end cover further reduces the heat conduction effect, which negatively affects the liquid cooling effect of the motor. In addition, the outer frame formed by casting has poor compactness, which also reduces the overall heat dissipation performance of the motor. Finally, the large number of parts of such a motor and the complicated manufacturing process also increase the manufacturing cost.

[0004] Therefore, it is necessary to provide a liquid-cooled motor with a flow channel formed in a frame and the frame thereof to solve the deficiencies of the current technology. SUMMARY

[0005] The present application aims to provide a liquid-cooled motor and a frame thereof. The frame of the motor comprises an inner frame and an outer frame. The flow channel is recessed on the surface of the inner frame, and the outer frame is sleeved on the surface of the inner frame. The outer frame is provided with two channels respectively communicating with the two ends of the flow channel, so that the liquid enters and exits the flow channel through the channels to absorb and carry away the heat. The flow channel is directly formed on the inner frame of the frame, which is not limited by the bending radius, and the cross-sectional shape and route design can be adjusted according to the needs, thereby increasing the heat dissipation area of the flow channel and optimizing the heat conduction path. The inner frame has bearing holes and flow channels, which not only eliminates the need for front end cover and stainless steel pipe, reduces the number of parts and manufacturing cost, but also enables the friction heat of the bearing to be directly conducted to the flow channel, thereby improving the heat dissipation efficiency. The relative position and distance between the flow channel and the bearing hole not only makes the flow channel and the bearing relatively close to form a shorter heat conduction path, but also further enhances the heat conduction effect between the flow channel and the bearing. The frame formed by pressure casting has high structural density, which also improves the overall heat dissipation efficiency of the motor.

[0006] To achieve the foregoing purpose, the present application provides a motor comprising a rotor, a stator, a bearing and a frame. The rotor comprises an output shaft extending in an axial direction. The stator is arranged around the rotor. The bearing is sleeved on the output shaft. The frame comprises a containing space, an inner frame and an outer frame. The containing space is configured to contain the rotor and the stator in the axial direction. The inner frame surrounds the containing space and comprises an outer wall, a flow channel and a bearing hole. The flow channel is recessed from the outer wall, the bearing hole contains the bearing in the axial direction, and the flow channel and the bearing hole at least partially overlap upward in a radial view. The outer frame is sleeved on the outer wall of the inner frame.

[0007] In an embodiment, the inner frame comprises an inner wall connected to the stator. The first thickness is smaller than the second thickness.

[0008] In an embodiment, the third thickness is not greater than half of the first thickness.

[0009] In an embodiment, in the axial cross-section, the bearing hole has a first width, and a projection of the flow channel on the bearing hole in the radial direction has a second width. The second width is not less than half of the first width.

[0010] In an embodiment, the outer frame comprises two channels respectively corresponding to the two ends of the flow channel of the inner frame.

[0011] In an embodiment, the inner frame and the outer frame are formed by pressure casting.

[0012] In an embodiment, in the axial cross-section, the flow channel has a plurality of flow channel cross-sections, and at least two of the plurality of flow channel cross-sections are different from each other.

[0013] In one embodiment, the motor further comprises a back end cover, which is disposed adjacent to one side of the inner frame and connected to the inner frame in the axial direction.

[0014] In one embodiment, the frame further comprises a bearing cover, which is disposed adjacent to one side of the inner frame and connected to the inner frame in the axial direction to cover the bearing.

[0015] To achieve the foregoing purposes, the application further provides a frame. The frame is suitable for a motor, and the frame comprises a receiving space, an inner frame, and an outer frame. The receiving space is configured to receive a rotor and a stator of the motor in the axial direction. The inner frame surrounds the receiving space and comprises an outer wall, a flow channel, and a bearing hole. The flow channel is recessed from the outer wall, the bearing hole is configured to receive a bearing in the axial direction, and the flow channel and the bearing hole at least partially overlap in the radial view. The outer frame is sleeved on the outer wall of the inner frame.

[0016] In one embodiment, the inner frame comprises an inner wall. There is a first thickness between the flow channel and the bearing hole, a second thickness between the inner wall and the bearing hole, and the first thickness is smaller than the second thickness.

[0017] In one embodiment, there is a third thickness between the outer wall of the inner frame and the bearing hole, and the first thickness is not greater than half of the third thickness.

[0018] In one embodiment, in the axial cross-section, the bearing hole has a first width, and the projection of the flow channel on the bearing hole in the radial direction has a second width, wherein the second width is not less than half of the first width.

[0019] In one embodiment, the outer frame comprises two passages, which are respectively in communication with two ends of the flow channel of the inner frame.

[0020] In one embodiment, the inner frame and the outer frame are formed by die casting.

[0021] In one embodiment, the flow channel has a plurality of flow channel cross-sections in the axial cross-section, and at least two of the plurality of flow channel cross-sections are different from each other.

[0022] In one embodiment, the frame further comprises a bearing cover, which is disposed adjacent to one side of the inner frame and connected to the inner frame in the axial direction to cover the bearing. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Structure diagram of the motor of one embodiment of the application.

[0024] Figure 2 Structure exploded view of the motor of one embodiment of the application.

[0025] Figure 3A Structure exploded view of the frame of one embodiment of the application.

[0026] Figure 3BStructural exploded view of the frame of one embodiment of the present application from another angle.

[0027] Figure 4A Cross-sectional view of the motor of one embodiment of the present application.

[0028] Figure 4B For Figure 4A Enlarged view of the middle region P.

[0029] Reference numeral explanation

[0030] 1: motor,

[0031] 10: rotor,

[0032] 11: output shaft,

[0033] 20: stator,

[0034] 30: bearing,

[0035] 40: frame,

[0036] 41: accommodation space,

[0037] 42: inner frame,

[0038] 42a: first side,

[0039] 42b: second side,

[0040] 421: outer wall,

[0041] 422: flow passage,

[0042] 423: bearing hole,

[0043] 424: inner wall,

[0044] 43: outer frame,

[0045] 431: first passage,

[0046] 432: second passage,

[0047] 44: bearing cover,

[0048] 50: rear end cover,

[0049] A: axial direction,

[0050] P: region,

[0051] S1, S2, S3, S4, S5, S6: flow passage cross section,

[0052] T1: first thickness,

[0053] T2: second thickness,

[0054] T3: third thickness,

[0055] W1: first width,

[0056] W2: second width,

[0057] X, Y, Z: axes. DETAILED DESCRIPTION

[0058] Some exemplary embodiments embodying features and advantages of the present application are described in detail below. It should be appreciated that the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like reference numerals indicate like elements in the drawings. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. For example, when a first feature is described as being "on" or "over" a second feature, it can be directly on the second feature or an intervening feature can also be present. In addition, spatially relative terms, such as "inner," "outer," "front," "back," and the like, can be used herein for ease of description to describe one element's or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. When a component is referred to as being "connected" or "coupled" to another component, it can be directly connected or coupled to the other component or intervening components can be present. It should be understood that, although the terms "first," "second," "third," etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms since such elements, components, regions, layers and / or sections can be only one of many elements, components, regions, layers and / or sections in accordance with an embodiment.

[0059] Reference will now be made to Figures 1 to 3B . Figure 1 A schematic view of a motor according to an embodiment of the present application. Figure 2 An exploded view of a motor according to an embodiment of the present application. Figure 3A An exploded view of a frame according to an embodiment of the present application. Figure 3BFIG. 6 is a structural exploded view of the frame of an embodiment of the present application from another angle. In this embodiment, the motor 1 includes a rotor 10, a stator 20, a bearing 30, and a frame 40. The rotor 10 includes a shaft 11 extending along an axial direction A. The axial direction A is parallel to the X-axis direction, for example. The stator 20 is disposed around the rotor 10. The bearing 30 is fitted around the shaft 11. The frame 40 includes a housing space 41, an inner frame 42, and an outer frame 43. The housing space 41 is configured to house the rotor 10 and the stator 20 along the axial direction A. In this embodiment, the inner frame 42 has a first side 42a and a second side 42b opposite to each other, for example, and the first side 42a and the second side 42b are disposed along the axial direction A. The inner frame 42 surrounds the housing space 41 and includes an outer wall 421, a flow channel 422, and a bearing hole 423. The flow channel 422 is recessed inward from the outer wall 421. The bearing hole 423 is disposed adjacent to the second side 42b of the inner frame 42, for example, and houses the bearing 30 along the axial direction A. In this embodiment, the flow channel 422 and the bearing hole 423 at least partially overlap in a radial view, so that the flow channel 422 is relatively close to the bearing 30 to form a short heat conduction path, thereby improving the heat dissipation performance of the motor 1. The outer frame 43 is fitted around the outer wall 421 of the inner frame 42. The outer frame 43 covers the flow channel 422, so that the flow channel 422 forms a pipe and is configured to flow a liquid (not shown). In this embodiment, the motor 1 further includes a rear end cover 50, which is disposed adjacent to the first side 42a of the inner frame 42 and connected to the inner frame 42 along the axial direction A. The frame 40 further includes a bearing cover 44, which is disposed adjacent to the second side 42b of the inner frame 42 and connected to the inner frame 42 along the axial direction A to cover the bearing 30. It should be noted that this is not intended to limit the essential technical features of the present application, and changes can be made as needed. In this embodiment, the inner frame 42 and the outer frame 43 are connected to each other by tight fit or welding to form the frame 40, but the present application is not limited thereto. In this embodiment, the rotor 10 of the motor 1 rotates relative to the stator 20 about the axial direction A, thereby driving the shaft 11 and the bearing 30 fitted around the shaft 11 to rotate relative to the frame 40, accompanied by frictional heat generation of the bearing 30. The bearing 30 is in direct contact with the inner circumferential surface of the bearing hole 423, for example, so that the heat generated by the friction thereof can be directly conducted to the flow channel 422 through the inner frame 42, and then absorbed and carried away from the motor by the liquid flowing in the flow channel 422, thereby achieving good heat dissipation effect and temperature control of the shaft 11. Since the flow channel 422 of the motor 1 of the present application is formed on the inner frame 42 of the frame 40, it is not limited by the bending radius, and the cross-sectional shape and route design can be adjusted according to the needs, thereby increasing the heat dissipation area of the flow channel 422 and optimizing the heat conduction path. The inner frame 42 has both the flow channel 422 and the bearing hole 423, which not only eliminates the need for the front end cover and stainless steel pipe, thereby reducing the number of parts and the manufacturing cost, but also enables the frictional heat of the bearing 30 to be directly conducted to the flow channel 422, thereby improving the heat dissipation performance.

[0060] Please refer to Figure 4Aand Figure 4B . Figure 4A A motor according to an embodiment of the present application. Figure 4B A motor according to an embodiment of the present application. Figure 4A An enlarged view of the region P. In this embodiment, the inner frame 42 comprises an inner wall 424, and the inner wall 424 of the inner frame 42 is connected to the stator 20. In the axial A cross-section, the flow channel 422 and the bearing hole 423 have a first thickness T1, and the inner wall 424 and the bearing hole 423 have a second thickness T2. The first thickness T1 is, for example, smaller than the second thickness T2. In other words, in the inner frame 42, the shortest distance between the flow channel 422 and the bearing hole 423 is smaller than the shortest distance between the inner wall 424 and the bearing hole 423 in the radial direction. In this way, the flow channel 422 is relatively close to the bearing 30, and a shorter heat conduction path is formed, which improves the heat dissipation performance of the motor 1.

[0061] In this embodiment, the outer wall 421 of the inner frame 42 and the bearing hole 423 have a third thickness T3. The first thickness T1 is, for example, not greater than two-thirds of the third thickness T3. In other words, in the inner frame 42, the shortest distance between the flow channel 422 and the bearing hole 423 is not greater than one-third of the shortest distance between the outer wall 421 and the bearing hole 423. In other words, the depth of the flow channel 422 in the radial direction (the distance from the outer wall 421 to the bottom of the flow channel 422) is not less than one-third of the shortest distance between the outer wall 421 and the bearing hole 423. In a preferred embodiment, the first thickness T1 is, for example, not greater than half of the third thickness T3. In other words, in the inner frame 42, the shortest distance between the flow channel 422 and the bearing hole 423 is not greater than one-half of the shortest distance between the outer wall 421 and the bearing hole 423. In other words, the depth of the flow channel 422 in the radial direction (the distance from the outer wall 421 to the bottom of the flow channel 422) is not less than one-half of the shortest distance between the outer wall 421 and the bearing hole 423. In this way, the flow channel 422 is relatively close to the bearing 30, and a shorter heat conduction path is formed, which improves the heat dissipation performance of the motor 1.

[0062] In the present embodiment, the bearing hole 423 has a first width W1 in a cross section along the axial direction A, and the flow channel 422 has a second width W2 in a projection along the radial direction on the bearing hole. The second width W2 is, for example, not less than half of the first width W1. In other words, the width of the portion where the flow channel 422 and the bearing hole 423 overlap with each other in the radial view is at least half of the width of the bearing hole 423. In a preferred embodiment, the second width W2 is, for example, not less than two-thirds of the first width W1. In other words, the width of the portion where the flow channel 422 and the bearing hole 423 overlap with each other in the radial view is at least two-thirds of the width of the bearing hole 423. In other words, the width of the portion where the flow channel 422 and the bearing hole 423 overlap with each other in the radial view is at least two-thirds of the width of the bearing hole 423. The short conduction path between the flow channel 422 and the bearing hole 423 facilitates the conduction of the friction heat generated by the bearing 30 from the bearing hole 423 to the flow channel 422 via the inner frame 42, thereby enhancing the heat conduction effect between the flow channel 422 and the bearing 30. Of course, the arrangement of the aforementioned outer wall 421, flow channel 422, and bearing hole 423, as well as the relative positions therebetween, can be adjusted according to actual requirements, and the present application is not limited in this regard.

[0063] In the present embodiment, the outer frame 43 includes a first channel 431 and a second channel 432, which are in communication with the two ends of the flow channel 422, respectively. The two ends of the flow channel 422 are, for example, adjacent to the first side 42a of the inner frame 42, and the bearing hole 423 is adjacent to the second side 42b of the inner frame 42, i.e., the two ends of the flow channel 422 and the bearing hole 423 are arranged on opposite sides of the inner frame 42. The first channel 431 and the second channel 432 are in communication with the two ends of the flow channel 422, and are therefore adjacent to the first side 42a. The flow channel 422 is arranged on the inner frame 42 in a substantially circumferential manner. The first channel 431 and the second channel 432 penetrate the outer frame 43, allowing the flow channel 422 to communicate with the outside. The first channel 431 and the second channel 432 penetrate the outer frame 43 along the Z-axis direction, for example. In the present embodiment, the motor 1 is connected to a liquid cooling module (not shown) through the first channel 431 and the second channel 432. The liquid cooling module is configured to introduce driving liquid into one end of the flow channel 422 through the first channel 431. The liquid flows in the flow channel 422 and absorbs heat, and then exits the motor 1 through the other end of the flow channel 422 and the second channel 432 to enter the liquid cooling module for cooling, thereby achieving the heat dissipation effect and temperature control of the motor 1. It should be noted that the configuration of the flow channel 422, the first channel 431, and the second channel 432 can be adjusted according to actual requirements, and the present application is not limited in this regard.

[0064] Please refer to Figure 4AIn this embodiment, the flow channel 422 has a plurality of flow channel sections S1, S2, S3, S4, S5, S6 (the area inside the thick dashed line in the figure) in the axial cross section, and at least two of the plurality of flow channel sections S1, S2, S3, S4, S5, S6 are different from each other. In this embodiment, at least two of the plurality of flow channel sections S1, S2, S3, S4, S5, S6 are different in shape but the same in area, or different in area but the same in shape, or different in both shape and area. By changing the cross-sectional shape and route design as needed, the heat dissipation area of the flow channel 422 can be increased and the heat conduction path can be optimized. In this embodiment, the inner frame 42 and the outer frame 43 are formed by die casting. The frame formed by die casting has high structural density, and the overall heat dissipation performance of the motor 1 is also improved.

[0065] In summary, the present application provides a liquid-cooled motor with a flow channel formed in the frame and a frame thereof. The frame of the motor includes an inner frame and an outer frame, and the flow channel is recessed on the surface of the inner frame, and the outer frame is sleeved on the surface of the inner frame. The outer frame is provided with two channels respectively communicating with the two ends of the flow channel, so that the liquid enters and exits the flow channel through the channels to absorb and carry away heat. The flow channel is directly formed on the inner frame of the frame, is not limited by the bending radius, and the cross-sectional shape and route design can be adjusted as needed, thereby increasing the heat dissipation area of the flow channel and optimizing the heat conduction path. The inner frame has a bearing hole and a flow channel, which not only omits the setting of the front cover and the stainless steel pipe, reduces the number of overall parts and reduces the manufacturing cost, but also enables the friction heat of the bearing to be directly conducted to the flow channel to improve the heat dissipation performance. The relative position and distance between the flow channel and the bearing hole not only enables the flow channel to be relatively close to the bearing to form a shorter heat conduction path, but also further enhances the heat conduction effect between the flow channel and the bearing. The frame formed by die casting has high structural density, and the overall heat dissipation performance of the motor is also improved.

[0066] The present application can be modified by those skilled in the art without departing from the scope of the application as claimed in the appended patent claims.

Claims

1. A motor, wherein, include: A rotor includes an output shaft, wherein the output shaft extends along an axial direction; A stator is arranged around the rotor; A bearing is fitted onto the output shaft; as well as A frame, including: A receiving space configured to receive the rotor and the stator along the axial direction; An inner frame surrounding the receiving space includes an outer wall, a flow channel, and a bearing bore, wherein the flow channel is recessed from the outer wall, the bearing bore receives the bearing along the axial direction, and the flow channel and the bearing bore at least partially overlap upwards in a radial view; and An outer frame, which encloses the outer wall of the inner frame.

2. The motor according to claim 1, wherein, The inner frame includes an inner wall connecting the stator, wherein the flow channel and the bearing hole have a first thickness, the inner wall and the bearing hole have a second thickness, and the first thickness is less than the second thickness.

3. The motor according to claim 2, wherein, The outer wall of the inner frame and the bearing hole have a third thickness, and the first thickness is not greater than half of the third thickness.

4. The motor according to claim 1, wherein, On a cross section along the axial direction, the bearing hole has a first width, and a projection of the flow channel onto the bearing hole has a second width, wherein the second width is not less than half of the first width.

5. The motor according to claim 1, wherein, On a cross section along the axial direction, the flow channel has multiple flow channel cross sections, and at least two of the multiple flow channel cross sections are different from each other.

6. The motor according to claim 1, wherein, The outer frame includes two channels, which are respectively connected to the two ends of the flow channel in the inner frame.

7. The motor according to claim 1, wherein, The inner frame and the outer frame are formed by die casting.

8. The motor according to claim 1, wherein, The motor also includes a rear end cover, which is located adjacent to one side of the inner frame and connected to the inner frame along the axial direction.

9. The motor according to claim 1, wherein, The frame also includes a bearing cap, which is disposed adjacent to one side of the inner frame and is connected to the inner frame along the axial direction to cover the bearing.

10. A frame for use with a motor, wherein, The frame includes: A receiving space configured to receive a rotor and a stator of the motor along an axial direction; An inner frame surrounding the receiving space includes an outer wall, a flow channel, and a bearing bore, wherein the flow channel is recessed from the outer wall, the bearing bore is configured to receive a bearing of the motor along the axial direction, and the flow channel and the bearing bore at least partially overlap upwards in a radial direction; and An outer frame, which encloses the outer wall of the inner frame.

11. The frame according to claim 10, wherein, The inner frame includes an inner wall, the flow channel and the bearing hole have a first thickness, the inner wall and the bearing hole have a second thickness, and the first thickness is less than the second thickness.

12. The frame according to claim 11, wherein, The outer wall of the inner frame and the bearing hole have a third thickness, and the first thickness is not greater than half of the third thickness.

13. The frame according to claim 10, wherein, On a cross section along the axial direction, the bearing hole has a first width, and a projection of the flow channel onto the bearing hole has a second width, wherein the second width is not less than half of the first width.

14. The frame according to claim 10, wherein, On a cross section along the axial direction, the flow channel has multiple flow channel cross sections, and at least two of the multiple flow channel cross sections are different from each other.

15. The frame according to claim 10, wherein, The outer frame includes two channels, which are respectively connected to the two ends of the flow channel in the inner frame.

16. The frame according to claim 10, wherein, The inner frame and the outer frame are formed by die casting.

17. The frame according to claim 10, wherein, The frame also includes a bearing cap, which is disposed adjacent to one side of the inner frame and is connected to the inner frame along the axial direction to cover the bearing.

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