Motor

Abstract

The invention provides a motor, which comprises a casing, an end cover, a fan and a stator assembly, the end cover is buckled at the end part of the casing, the stator assembly is assembled at the inner side of the casing, the stator assembly comprises a stator iron core and a plurality of windings wound on the stator iron core, and each winding is provided with a winding end part positioned between the stator iron core and the end cover; a spiral flow channel is formed on the inner side of the casing, the fan is arranged in the spiral flow channel, the spiral flow channel surrounds the periphery of the end part of each winding, a matching flow channel is formed on the end cover, the matching flow channel is communicated with the spiral flow channel, and a motor inner cavity is also formed between the end cover and the stator iron core; and air flow driven by the fan sequentially flows through the spiral flow channel, the matching flow channel, the motor inner cavity and the winding end part and returns into the spiral flow channel to form air flow circulation. According to the invention, the air flow circulation driven by the fan can effectively dissipate heat of the winding end part with the highest temperature of the motor, thereby improving the heat dissipation efficiency of the motor, improving the operation efficiency of the motor, and finally increasing the torque density and power density of the motor.

Description

Technical Field

[0001] The invention belongs to the technical field of motor design, and in particular relates to a motor. Background Art

[0002] Motor cooling has a great impact on motor performance. The cooling effect of the motor and the excessively high temperature of the motor limit the high power density and torque density of the motor. Good heat dissipation and cooling have a great effect on improving motor performance. The winding is the part of the motor that generates the most heat, and the winding end is one of the areas with the highest motor temperature because there is no efficient heat dissipation method.

[0003] Existing air-cooled motors do not directly cool the winding ends of the motors, and cannot transfer heat through the stator core, relying only on the air in the motor cavity for natural heat dissipation. However, the air in the motor cavity does not flow regularly, and the heat transfer effect of static air is not high, which causes the internal temperature to accumulate, resulting in the inability to efficiently dissipate heat at the winding ends, which directly affects the performance and reliability of the motor. Summary of the invention

[0004] Therefore, the present invention provides a motor that can solve the technical problems that the air in the inner cavity of the existing air-cooled motor has irregular flow and the heat transfer effect of static air is not high, which causes internal temperature accumulation and leads to the inability to efficiently dissipate heat at the winding ends, thereby directly affecting the performance and reliability of the motor.

[0005] In order to solve the above problems, the present invention provides a motor, including a casing, an end cover, a fan and a stator assembly, the end cover is buckled on the end of the casing, the stator assembly is assembled on the inner side of the casing, the stator assembly includes a stator core and a plurality of windings wound on the stator core, each of the windings has a winding end located between the stator core and the end cover; a spiral flow channel is formed on the inner side of the casing, the fan is arranged in the spiral flow channel, the spiral flow channel surrounds the periphery of each winding end, a matching flow channel is formed on the end cover, the matching flow channel is connected with the spiral flow channel, and a motor inner cavity is also formed between the end cover and the stator core; the airflow driven by the fan flows through the spiral flow channel, the matching flow channel, the motor inner cavity, the winding end in sequence and returns to the spiral flow channel to form an airflow circulation.

[0006] In some embodiments, a heat-conducting structure is provided on the inner side of the casing, and the heat-conducting structure is located between the stator core and the end cover. The heat-conducting structure includes a circumferential side wall and a first spiral heat-conducting rib located radially inside the circumferential side wall, and the first spiral heat-conducting rib surrounds the periphery of each winding end, and the first spiral heat-conducting rib cooperates with the circumferential side wall to form the spiral flow channel, and the outer circumferential surface of the circumferential side wall is in contact with the inner circumferential surface of the casing.

[0007] In some embodiments, along the radial direction of the motor, the thickness of the first spiral thermal rib is t1, and 1mm≤t1≤3mm.

[0008] In some embodiments, a first spiral heat dissipation rib is provided on the outer circumferential surface of the housing.

[0009] In some embodiments, a root of the first spiral heat dissipating rib is aligned with a root of the first spiral heat conducting rib.

[0010] In some embodiments, along the radial direction of the motor, the height of the first spiral heat dissipation rib is h, h≥10mm; and / or, along the axial direction of the motor, the thickness of the first spiral heat dissipation rib is t2, 1mm≤t2≤3mm.

[0011] In some embodiments, a second spiral heat-conducting rib is provided on a side of the end cover facing the stator core, and the second spiral heat-conducting rib cooperates with the end cover to form the matching flow channel.

[0012] In some embodiments, a second spiral heat dissipating rib is provided on a side of the end cover facing away from the stator core.

[0013] In some embodiments, a root of the second spiral heat dissipating rib is aligned with a root of the second spiral heat conducting rib.

[0014] In some embodiments, the number of the end covers, fans and spiral flow channels is two, the two end covers are respectively buckled on the two ends of the casing, the two spiral flow channels are respectively located between the stator core and the two end covers, the two fans are respectively arranged in the two spiral flow channels, and two motor cavities are formed between the two end covers and the stator core, and each winding has two winding ends located between the stator core and the two end covers.

[0015] The present invention provides a motor having the following beneficial effects:

[0016] Since the airflow driven by the fan flows through the spiral flow channel, the matching flow channel, the inner cavity of the motor, the winding end and returns to the spiral flow channel to form an airflow cycle, the present application can effectively dissipate the heat of the winding end with the highest temperature of the motor, thereby increasing the heat dissipation efficiency of the motor, improving the motor operation efficiency, and ultimately increasing the motor torque density and power density. It can be understood that because the spiral flow channel is arranged on the inner side of the casing and the matching flow channel is formed on the end cover, the heat generated by the winding end is eventually transferred to the casing and the end cover through the circulating airflow and dissipated to the outside of the motor. Further, since the fan is arranged in the spiral flow channel and the spiral flow channel surrounds the periphery of each winding end, when the fan is running, the airflow driven by it will spiral forward along the spiral flow channel, thereby also dissipating the heat of the winding end in multiple circles and at multiple levels, further improving the heat dissipation efficiency. Furthermore, since the circulating airflow for dissipating the heat of the winding end only flows inside the motor, it does not exchange with the outside air. Therefore, the present application can ensure the sealing and high protection of the motor on the basis of effectively dissipating the heat of the winding end. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] Figure 1 is a cross-sectional view of a motor according to Embodiment 1 of the present invention;

[0019] Figure 2 for Figure 1 An enlarged schematic diagram of point A of the motor of Embodiment 1 of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of a motor according to Embodiment 1 of the present invention;

[0021] Figure 4 It is a cross-sectional view of the motor according to the second embodiment of the present invention.

[0022] The reference numerals are as follows:

[0023] 1. Casing; 2. End cover; 3. Fan; 4. Stator core; 5. Winding end; 6. Spiral flow channel; 7. Matching flow channel; 8. Motor cavity; 9. Side wall; 10. First spiral heat-conducting rib; 11. Annular heat-dissipating rib; 12. Second spiral heat-conducting rib; 13. Second spiral heat-dissipating rib; 14. Rotating shaft; 15. Motor rotor. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0027] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0028] See also Figures 1 to 4As shown, according to an embodiment of the present invention, a motor is provided, comprising a housing 1, an end cover 2, a fan 3 and a stator assembly, wherein the end cover 2 is buckled at the end of the housing 1, and the stator assembly is assembled on the inner side of the housing 1, and the stator assembly comprises a stator core 4 and a plurality of windings wound on the stator core 4, and each winding has a winding end 5 located between the stator core 4 and the end cover 2. A spiral flow channel 6 is formed on the inner side of the housing 1, and the fan 3 is arranged in the spiral flow channel 6, and the spiral flow channel 6 surrounds the periphery of each winding end 5. A matching flow channel 7 is formed on the end cover 2, and the matching flow channel 7 is connected with the spiral flow channel 6, and a motor inner cavity 8 is also formed between the end cover 2 and the stator core 4. The airflow driven by the fan 3 flows through the spiral flow channel 6, the matching flow channel 7, the motor inner cavity 8, the winding end 5 in sequence and returns to the spiral flow channel 6 to form an airflow cycle.

[0029] In this technical solution, since the airflow driven by the fan 3 flows through the spiral flow channel 6, the matching flow channel 7, the motor cavity 8, the winding end 5 in sequence and returns to the spiral flow channel 6 to form an airflow cycle, the present application can effectively dissipate the heat of the winding end 5 with the highest temperature of the motor, thereby increasing the heat dissipation efficiency of the motor, improving the motor operation efficiency, and ultimately increasing the motor torque density and power density. It can be understood that because the spiral flow channel 6 is arranged on the inner side of the housing 1 and the matching flow channel 7 is formed on the end cover 2, the heat generated by the winding end 5 is ultimately transferred to the housing 1 and the end cover 2 through the circulating airflow and dissipated to the outside of the motor. Further, since the fan 3 is arranged in the spiral flow channel 6 and the spiral flow channel 6 surrounds the periphery of each winding end 5, when the fan 3 is running, the airflow driven by it will spiral forward along the spiral flow channel 6, thereby also dissipating the heat of the winding end 5 in multiple circles and at multiple levels, further improving the heat dissipation efficiency. Furthermore, since the circulating airflow for dissipating heat to the winding end 5 only flows inside the motor and does not exchange with the outside air, the present application can ensure the sealing and high protection of the motor on the basis of effectively dissipating heat to the winding end 5.

[0030] It should be noted that in the prior art, a wind wheel is mounted on the rotating shaft 14 of the motor to dissipate heat for the winding end 5. Since the wind wheel is driven to rotate by the rotating shaft 14, the amount of air generated by the wind wheel is subject to the rotation speed of the motor, which will result in insufficient air volume generated by the wind wheel when the motor speed is low, and the winding end 5 cannot be effectively dissipated. The fan 3 of the present application is separately provided, and the fan 3 can effectively dissipate heat for the winding end 5 even when the motor speed is low or even when the motor stops working. For the power connection of the fan 3, a wiring port can be provided on the housing 1 or the end cover 2, and the external power line is electrically connected to the fan 3 through the wiring port. Considering the space problem of the fan 3 installed in the spiral flow channel 6, the heat dissipation solution for the winding end 5 of the present application is mainly applied to large motors, then the space of the spiral flow channel 6 can be designed to be larger, and the fan 3 uses a small blower fan, so as to ensure that the fan 3 can be installed in the spiral flow channel 6. Of course, if the space in the spiral flow channel 6 allows, the number of fans 3 can also be set to more than two to enhance the heat dissipation effect.

[0031] See also Figure 1 and Figure 2 As shown, a heat-conducting structure is provided on the inner side of the casing 1, and the heat-conducting structure is located between the stator core 4 and the end cover 2. The heat-conducting structure includes a circumferential side wall 9 and a first spiral heat-conducting rib 10 located radially inside the circumferential side wall 9. The first spiral heat-conducting rib 10 surrounds the periphery of each winding end 5. The first spiral heat-conducting rib 10 cooperates with the circumferential side wall 9 to form a spiral flow channel 6. The outer circumferential surface of the circumferential side wall 9 contacts the inner circumferential surface of the casing 1.

[0032] In this embodiment, the arrangement of the first spiral heat-conducting rib 10 and the circumferential side wall 9 not only forms the spiral flow channel 6, but also increases the contact area between the heat-conducting structure and the circulating airflow, so that the heat generated by the winding end 5 can be transferred to the heat-conducting structure faster and more through the circulating airflow, and then transferred to the housing 1 by the heat-conducting structure, and finally the heat is dissipated from the housing 1 to the outside of the motor. That is, the arrangement of the first spiral heat-conducting rib 10 significantly improves the heat dissipation efficiency of the winding end 5. It can be understood that the wall of the first spiral heat-conducting rib 10 is constructed with an avoidance gap to facilitate the installation of the fan 3 in the spiral flow channel 6. It should be noted that the heat-conducting structure and the housing 1 are interference-fitted, and the reason why the spiral heat-conducting rib is not directly arranged on the inner surface of the housing 1 to form the spiral flow channel 6 is that the stator core 4 cannot be installed in the housing 1 after the spiral heat-conducting rib is arranged. By separately providing a heat-conducting structure and forming the spiral flow channel 6 thereon, the stator core 4 can be installed into the casing 1 first, and then the heat-conducting structure can be installed into the casing 1, so that the installation of the stator core 4 will not be affected.

[0033] As a specific implementation, along the radial direction of the motor, the thickness of the first spiral thermal rib 10 is t1, 1mm≤t1≤3mm, which can ensure that the first spiral thermal rib 10 has good structural strength while not affecting the thermal conductivity of the first spiral thermal rib 10 due to excessive thickness.

[0034] See also Figure 3 As shown, a first spiral heat dissipation rib is arranged on the outer circumferential surface of the housing 1 .

[0035] In this technical solution, the provision of the first spiral heat dissipation rib increases the contact area between the housing 1 and the outside air, so that the heat transferred to the housing 1 can be dissipated to the outside more quickly, thereby indirectly improving the heat dissipation efficiency of the winding end 5. It can be understood that the heat dissipation ribs provided on the outer circumference of the housing 1 can also be multiple turns of annular heat dissipation ribs 11, and the use of the annular heat dissipation ribs 11 can also improve the heat dissipation efficiency of the housing 1.

[0036] See also Figure 1 and Figure 2 As shown, the root of the first spiral heat dissipating rib is aligned with the root of the first spiral heat conducting rib 10 .

[0037] In this embodiment, the root of the first spiral heat dissipating rib is the junction of the first spiral heat dissipating rib and the housing 1, and the root of the first spiral heat conductive rib 10 is the junction of the first spiral heat conductive rib 10 and the peripheral side wall 9. When the root of the first spiral heat dissipating rib is aligned with the root of the first spiral heat conductive rib 10, the heat transfer efficiency from the first spiral heat conductive rib 10 to the first spiral heat dissipating rib can be improved, thereby being more conducive to improving the heat dissipation of the winding end 5 of the present application.

[0038] More specifically, along the radial direction of the motor, the height of the first spiral heat dissipation rib is h, h≥10mm, so that the first spiral heat dissipation rib has a reasonable height to ensure the heat dissipation effect. Along the axial direction of the motor, the thickness of the first spiral heat dissipation rib is t2, 1mm≤t2≤3mm, so that the first spiral heat dissipation rib can have a good structural strength without affecting the heat dissipation effect due to excessive thickness.

[0039] See also Figure 1 As shown, a second spiral heat-conducting rib 12 is provided on the side of the end cover 2 facing the stator core 4 , and the second spiral heat-conducting rib 12 cooperates with the end cover 2 to form a matching flow channel 7 .

[0040] In this embodiment, the second spiral heat-conducting rib 12 is set so that the matching flow channel 7 is also a spiral flow channel, so that the circulating airflow also moves forward in a spiral when traveling along the matching flow channel 7, so that the circulating airflow and the end cover 2 and the second spiral heat-conducting rib 12 are in contact with each other in multiple circles and multiple levels, so that the heat generated by the winding end 5 can be transferred to the end cover 2 faster and more through the circulating airflow, and then dissipated from the end cover 2 to the outside of the motor. That is, the setting of the second spiral heat-conducting rib 12 further improves the heat dissipation efficiency of the winding end 5. Among them, a certain electrical safety distance is reserved between the second spiral heat-conducting rib 12 and the winding end 5.

[0041] See also Figure 1 As shown, a second spiral heat dissipating rib 13 is provided on the side of the end cover 2 facing away from the stator core 4 .

[0042] In this technical solution, the provision of the second spiral heat dissipation rib 13 increases the contact area between the end cover 2 and the outside air, so that the heat transferred to the end cover 2 can be dissipated to the outside more quickly, thereby indirectly improving the heat dissipation efficiency of the winding end 5.

[0043] See also Figure 1 As shown, the root of the second spiral heat dissipating rib 13 is aligned with the root of the second spiral heat conducting rib 12 .

[0044] In this embodiment, the root of the second spiral heat dissipating rib 13 is the junction of the second spiral heat dissipating rib 13 and the end cover 2, and the root of the second spiral heat conductive rib 12 is the junction of the second spiral heat conductive rib 12 and the end cover 2. When the root of the second spiral heat dissipating rib 13 is aligned with the root of the second spiral heat conductive rib 12, the heat transfer efficiency from the second spiral heat conductive rib 12 to the second spiral heat dissipating rib 13 can be improved, thereby being more conducive to improving the heat dissipation of the winding end 5 of the present application.

[0045] See also Figure 1 and Figure 3 As shown, the number of end covers 2, fans 3 and spiral flow channels 6 are all two, the two end covers 2 are respectively buckled on the two ends of the casing 1, the two spiral flow channels 6 are respectively located between the stator core 4 and the two end covers 2, the two fans 3 are respectively arranged in the two spiral flow channels 6, and two motor inner cavities 8 are formed between the two end covers 2 and the stator core 4, and each winding has two winding ends 5 located between the stator core 4 and the two end covers 2. That is, the air cooling scheme of the present application can be applied to the two winding ends 5 of the winding at the same time, so that the heat can be dissipated from each winding end 5 at both ends of the stator core 4, so that the heat is evenly dissipated from the motor as a whole. Among them, the two end covers 2 are the front end cover and the rear end cover of the motor respectively, and the motor rotor 15 is arranged on the radial inner side of the stator core 4.

[0046] It should also be noted that Figure 4 Another solution of the present application is shown in Figure 4In the embodiment, the matching flow channel 7 is directly constructed in the wall of the end cover 2, one end of the matching flow channel 7 is connected with the spiral flow channel 6, and the other end of the matching flow channel 7 is connected with the motor inner cavity 8. The matching flow channel 7 is provided with a small-sized heat dissipation rib. This scheme can also realize the circulation of airflow in the spiral flow channel 6, the matching flow channel 7, the motor inner cavity 8, and the winding end 5 to achieve the purpose of heat dissipation of the winding end 5.

[0047] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A motor, characterized in that: The invention comprises a casing (1), an end cover (2), a fan (3) and a stator assembly, wherein the end cover (2) is buckled on the end of the casing (1), the stator assembly is mounted on the inner side of the casing (1), the stator assembly comprises a stator core (4) and a plurality of windings wound on the stator core (4), each of the windings having a winding end (5) located between the stator core (4) and the end cover (2); A spiral flow channel (6) is formed on the inner side of the housing (1), the fan (3) is arranged in the spiral flow channel (6), the spiral flow channel (6) surrounds the periphery of each winding end (5), a matching flow channel (7) is formed on the end cover (2), the matching flow channel (7) is connected to the spiral flow channel (6), and a motor cavity (8) is also formed between the end cover (2) and the stator core (4); The airflow driven by the fan (3) flows sequentially through the spiral flow channel (6), the matching flow channel (7), the motor inner cavity (8), the winding end (5) and returns to the spiral flow channel (6) to form an airflow cycle.

2. The motor according to claim 1, characterized in that A heat-conducting structure is provided on the inner side of the casing (1), the heat-conducting structure being located between the stator core (4) and the end cover (2), the heat-conducting structure comprising a circumferential side wall (9) and a first spiral heat-conducting rib (10) located radially inward of the circumferential side wall (9), the first spiral heat-conducting rib (10) surrounding the periphery of each winding end (5), the first spiral heat-conducting rib (10) cooperating with the circumferential side wall (9) to form the spiral flow channel (6), and the outer circumferential surface of the circumferential side wall (9) being in contact with the inner circumferential surface of the casing (1).

3. The motor according to claim 2, characterized in that Along the radial direction of the motor, the thickness of the first spiral heat-conducting rib (10) is t1, 1 mm ≤ t1 ≤ 3 mm.

4. The motor according to claim 2, characterized in that First spiral heat dissipation ribs are arranged on the outer peripheral surface of the casing (1).

5. The motor according to claim 4, characterized in that The root of the first spiral heat dissipating rib is aligned with the root of the first spiral heat conducting rib (10).

6. The motor according to claim 4, characterized in that Along the radial direction of the motor, the height of the first spiral heat dissipation rib is h, h≥10mm; and / or, along the axial direction of the motor, the thickness of the first spiral heat dissipation rib is t2, 1mm≤t2≤3mm.

7. The motor according to claim 1, characterized in that A second spiral heat-conducting rib (12) is provided on the side of the end cover (2) facing the stator core (4), and the second spiral heat-conducting rib (12) cooperates with the end cover (2) to form the matching flow channel (7).

8. The motor according to claim 7, characterized in that A second spiral heat dissipation rib (13) is provided on the side of the end cover (2) facing away from the stator core (4).

9. The motor according to claim 8, characterized in that The root of the second spiral heat dissipating rib (13) is aligned with the root of the second spiral heat conducting rib (12).

10. The motor according to any one of claims 1 to 9, characterized in that: The number of the end covers (2), the fan (3) and the spiral flow channel (6) is two. The two end covers (2) are respectively buckled on the two ends of the housing (1). The two spiral flow channels (6) are respectively located between the stator core (4) and the two end covers (2). The two fans (3) are respectively arranged in the two spiral flow channels (6). Two motor inner cavities (8) are formed between the two end covers (2) and the stator core (4). Each winding has two winding ends (5) located between the stator core (4) and the two end covers (2).

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