Stator assembly of external rotor motor

Abstract

The utility model provides a stator assembly of an external rotor motor. The stator assembly comprises an iron core support, a stator winding, a sealing sleeve, a front end cover and a rear end cover. The stator winding sleeves the outer side of the iron core support and is fixed to the iron core support, the sealing sleeve sleeves the outer side of the stator winding, the front end cover and the rear end cover are fixed to the two sides of the iron core support in the axial direction respectively, and the two ends of the sealing sleeve in the axial direction sleeve the front end cover and the rear end cover respectively. An annular cooling cavity is defined by the iron core support, the sealing sleeve, the front end cover and the rear end cover. The rear end cover is provided with a first cooling liquid inlet, and the inner side of the rear end cover is further provided with a plurality of first cooling liquid outlets which are distributed at intervals in the circumferential direction. The front end cover is provided with a second cooling liquid outlet, and the inner side of the front end cover is further provided with a plurality of second cooling liquid inlets which are distributed at intervals in the circumferential direction. When the stator winding is used, the cooling liquid flowing through the cooling cavity can uniformly cool the stator winding, so that the cooling effect on the stator winding can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of outer rotor motors, in particular to a stator assembly of an outer rotor motor. Background Art

[0002] Outer rotor motors are a common type of motors currently on the market. When the high-power, high-speed outer rotor motors currently on the market are working, the stator windings located inside the outer rotor motors will generate more heat; in order to improve the cooling effect of the stator windings, motors that use coolants to liquid-cool the stator windings are currently available on the market, such as the motor with bearing and stator winding cooling functions disclosed in Chinese Patent Publication No.: CN116545159A. When the motor is in use, the coolant can flow through the casing to cool the stator windings; however, in the above-mentioned motor structure with bearing and stator winding cooling functions, although the coolant can flow through the casing and cool the stator windings, the coolant inlet and coolant outlet are only provided on one side of the casing, which will cause the coolant located inside the casing to have the disadvantage of poor fluidity, and thus it is difficult to achieve uniform cooling of the stator windings, that is, there is a disadvantage of poor cooling effect on the stator windings. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a stator assembly of an outer rotor motor, wherein when in use, the coolant flowing through the cooling cavity can achieve uniform cooling of the stator winding, thereby improving the cooling effect of the stator winding.

[0004] The utility model provides a stator assembly of an outer rotor motor, comprising an iron core support, a stator winding, a sealing sleeve, a front end cover and a rear end cover; the stator winding is sleeved on the outer side of the iron core support and fixed with the iron core support, the sealing sleeve is sleeved on the outer side of the stator winding, the front end cover and the rear end cover are respectively fixed on both sides of the axial direction of the iron core support, the front end cover and the rear end cover are both circumferentially sealed with the iron core support, the two ends of the sealing sleeve in the axial direction are respectively sleeved on the front end cover and the rear end cover, the front end cover and the rear end cover are both circumferentially sealed with the sealing sleeve, the iron core support, the sealing sleeve, the front end cover and the rear end cover form an annular cooling cavity, and the stator winding is located in the cooling cavity; a first cooling liquid inlet is provided on the rear end cover, and a plurality of first cooling liquid outlets which are distributed at intervals in the circumferential direction and are connected with the first cooling liquid inlet and the cooling cavity are also provided on the inner side of the rear end cover; a second cooling liquid outlet is provided on the front end cover, and a plurality of second cooling liquid inlets which are distributed at intervals in the circumferential direction and are connected with the second cooling liquid outlet and the cooling cavity are also provided on the inner side of the front end cover.

[0005] After adopting the above structure, the utility model can spray the coolant from the first coolant inlet toward the stator winding through a plurality of first coolant outlets distributed at circumferential intervals at the same time, and the plurality of second coolant inlets can collect the coolant after cooling the stator winding from a plurality of positions and discharge the coolant through the second coolant outlets in time, thereby improving the fluidity of the coolant located inside the cooling cavity, that is, the coolant flowing through the cooling cavity can achieve uniform cooling of the stator winding, thereby improving the cooling effect of the stator winding.

[0006] In a possible implementation, a plurality of first coolant outlets and a plurality of second coolant inlets are offset one by one along the circumferential direction of the cooling chamber; by adopting this structure, after the coolant is sprayed into the cooling chamber through the plurality of first coolant outlets, the coolant can cool the stator winding, and then the coolant after cooling the stator winding can be discharged from the cooling chamber through the plurality of second liquid inlets. Since the plurality of first coolant outlets and the plurality of second coolant inlets are offset one by one along the circumferential direction of the cooling chamber, in the process that the coolant enters the cooling chamber through the first coolant outlets and is discharged from the cooling chamber through the second liquid inlets, the coolant can be deflected to a certain extent along the circumferential direction of the cooling chamber, that is, the coolant can produce a vortex effect, and then the coolant can cool the stator winding evenly, that is, the cooling effect of the coolant on the stator winding can be improved.

[0007] In a possible implementation, the front end cover and the rear end cover are both circumferentially sealed with the core support by a first O-ring, and the front end cover and the rear end cover are both circumferentially sealed with the sealing sleeve by a second O-ring; by adopting this structure, the two first O-rings can reliably seal the gap between the front end cover and the core support and the gap between the rear end cover and the core support; the two second O-rings can reliably seal the gap between the front end cover and the sealing sleeve and the gap between the rear end cover and the sealing sleeve.

[0008] In a possible embodiment, a first guide cavity corresponding to and connected to a plurality of first coolant outlets is provided inside the rear end cover, and every two adjacent first guide cavities are connected through at least one first guide channel, and one of the first guide cavities is connected to the first coolant inlet; by adopting this structure, each first coolant outlet can be reliably connected to the first coolant inlet.

[0009] In a possible implementation, every two adjacent first guide chambers are connected by two first guide channels, and the two first guide channels between every two adjacent first guide chambers are respectively located at the inner edge and the outer edge of the first guide chamber; by adopting this structure, the coolant from the previous first guide chamber can enter the next first guide chamber more smoothly through the two first guide channels, that is, the coolant can reach the location of each first guide chamber more smoothly and evenly.

[0010] In a possible embodiment, the width of the first guide channel near the inner edge of the first guide cavity is greater than the width of the first guide channel near the outer edge of the first guide cavity; after adopting this structure, since the inner circumference of the rear end cover is smaller than the outer circumference, by setting the width of the first guide channel near the inner edge of the first guide cavity to be greater than the width of the first guide channel near the outer edge of the first guide cavity, the flow rate of the coolant flowing through the first guide channel near the inner edge of the first guide cavity can be slowed down, and the flow rate of the coolant flowing through the first guide channel near the outer edge of the first guide cavity can be increased, so that the flow rate of the coolant flowing through the two first guide channels between each two first guide cavities is kept consistent as much as possible, that is, the coolant can flow evenly to each first guide cavity.

[0011] In a possible implementation, each first coolant outlet is aligned with the middle of the corresponding first guide cavity; by adopting this structure, the coolant entering the first guide cavity can be discharged more smoothly and evenly from the first coolant outlet at the corresponding position.

[0012] In one possible embodiment, a second guide cavity is provided inside the front end cover, which corresponds one-to-one to and is connected to a plurality of second coolant inlets, and all second guide cavities are connected to the second coolant outlet; by adopting this structure, each second coolant inlet can be reliably connected to the second coolant outlet.

[0013] In a possible embodiment, an annular flow channel is provided inside the front end cover, and the annular flow channel is located on the inner side of all the second guide chambers, and each second guide chamber is connected to the annular flow channel through a second guide channel located between the second guide chamber and the annular flow channel, and the second coolant outlet is connected to the annular flow channel; through the provision of the annular flow channel, and each second guide chamber is connected to the annular flow channel through the second guide channel located between the second guide chamber and the annular flow channel, each second guide chamber can be reliably connected to the second coolant outlet, that is, each second coolant inlet can be reliably connected to the second coolant outlet.

[0014] In a possible implementation, each second cooling liquid inlet is aligned with the middle of the corresponding second guide cavity; by adopting this structure, the cooling liquid after cooling the stator winding can evenly enter each second guide cavity through each second cooling liquid inlet and be collected by the second guide cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a first three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 This is a second three-dimensional structural schematic diagram of the utility model;

[0017] Figure 3 It is a cross-sectional structural schematic diagram of the utility model;

[0018] Figure 4 It is a three-dimensional cross-sectional structural schematic diagram of the utility model;

[0019] Figure 5 It is a first three-dimensional structural schematic diagram of the rear end cover;

[0020] Figure 6 is a second three-dimensional structural schematic diagram of the rear end cover;

[0021] Figure 7 It is a three-dimensional cross-sectional structural schematic diagram of the rear end cover;

[0022] Figure 8 It is a three-dimensional structural schematic diagram of the front end cover;

[0023] Fig. 9 It is a schematic diagram of the three-dimensional cross-sectional structure of the front end cover. DETAILED DESCRIPTION

[0024] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0025] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0026] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] See also Figure 1-9 As shown, the embodiment of the present application discloses a stator assembly of an outer rotor motor, including an iron core support 1, a stator winding 2, a sealing sleeve 3, a front end cover 4 and a rear end cover 5; the stator winding 2 is sleeved on the outer side of the iron core support 1 and fixed to the iron core support 1, the sealing sleeve 3 is sleeved on the outer side of the stator winding 2, the front end cover 4 and the rear end cover 5 are respectively fixed on both sides of the axial direction of the iron core support 1, the front end cover 4 and the rear end cover 5 are both circumferentially sealed with the iron core support 1, the two ends of the sealing sleeve 3 in the axial direction are respectively sleeved on the front end cover 4 and the rear end cover 5, and the front end cover 4 and the rear end cover 5 are both circumferentially sealed with the sealing sleeve 3 The core support 1, the sealing sleeve 3, the front end cover 4 and the rear end cover 5 form a ring-shaped cooling cavity 6, and the stator winding 2 is located in the cooling cavity 6; the rear end cover 5 is provided with a first coolant inlet 51, and the inner side of the rear end cover 5 is also provided with a plurality of first coolant outlets 52 which are distributed at intervals in the circumferential direction and are connected with the first coolant inlet 51 and the cooling cavity 6; the front end cover 4 is provided with a second coolant outlet 41, and the inner side of the front end cover 4 is also provided with a plurality of second coolant inlets 42 which are distributed at intervals in the circumferential direction and are connected with the second coolant outlet 41 and the cooling cavity 6.

[0029] When the utility model cools the stator winding, the coolant flows into the cooling chamber through the first coolant inlet and the first coolant outlet. The coolant entering the cooling chamber can cool the stator winding. The coolant after cooling the stator winding can be discharged through the second coolant inlet and the second coolant outlet. Through the above process, the cooling of the stator winding can be achieved.

[0030] A plurality of first coolant outlets 52 and a plurality of second coolant inlets 42 are offset one by one along the circumferential direction of the cooling chamber 6; by adopting this structure, after the coolant is sprayed into the cooling chamber through the plurality of first coolant outlets, the coolant can cool the stator winding, and then the coolant after cooling the stator winding can be discharged from the cooling chamber through the plurality of second liquid inlets. Since the plurality of first coolant outlets and the plurality of second coolant inlets are offset one by one along the circumferential direction of the cooling chamber, in the process that the coolant enters the cooling chamber through the first coolant outlets and is discharged from the cooling chamber through the second liquid inlets, the coolant can produce a certain deflection along the circumferential direction of the cooling chamber, that is, the coolant can produce a vortex effect, and then the coolant can evenly cool the stator winding, that is, the cooling effect of the coolant on the stator winding can be improved.

[0031] The front end cover 4 and the rear end cover 5 are both circumferentially sealed with the core support 1 through a first O-ring 7, and the front end cover 4 and the rear end cover 5 are both circumferentially sealed with the sealing sleeve 3 through a second O-ring 8; by adopting this structure, the two first O-rings can reliably seal the gap between the front end cover and the core support and the gap between the rear end cover and the core support; the two second O-rings can reliably seal the gap between the front end cover and the sealing sleeve and the gap between the rear end cover and the sealing sleeve.

[0032] The interior of the rear end cover 5 is provided with first guide cavities 53 corresponding to and connected with a plurality of first coolant outlets 52 one by one, and each two adjacent first guide cavities 53 are connected through at least one first guide channel 54, and one of the first guide cavities 53 is connected with the first coolant inlet 51; by adopting this structure, each first coolant outlet can be reliably connected with the first coolant inlet.

[0033] Every two adjacent first guide chambers 53 are connected by two first guide channels 54, and the two first guide channels 54 between every two adjacent first guide chambers 53 are respectively located at the inner edge and the outer edge of the first guide chamber 53; by adopting this structure, the coolant from the previous first guide chamber can enter the next first guide chamber more smoothly through the two first guide channels, that is, the coolant can reach the location of each first guide chamber more smoothly and evenly.

[0034] The width of the first guide channel 54 near the inner edge of the first guide cavity 53 is greater than the width of the first guide channel 54 near the outer edge of the first guide cavity 53; after adopting this structure, since the inner circumference of the rear end cover is smaller than the outer circumference, by setting the width of the first guide channel near the inner edge of the first guide cavity to be greater than the width of the first guide channel near the outer edge of the first guide cavity, the flow rate of the coolant flowing through the first guide channel near the inner edge of the first guide cavity can be slowed down, and the flow rate of the coolant flowing through the first guide channel near the outer edge of the first guide cavity can be increased, so that the flow rate of the coolant flowing through the two first guide channels between each two first guide cavities is kept consistent as much as possible, that is, the coolant can flow evenly to each first guide cavity.

[0035] Each first coolant outlet 52 is aligned with the middle of the corresponding first guide cavity 53; by adopting this structure, the coolant entering the first guide cavity can be discharged more smoothly and evenly from the first coolant outlet at the corresponding position.

[0036] The interior of the front end cover 4 is provided with second guide cavities 43 corresponding one-to-one to and connected with a plurality of second coolant inlets 42, and all second guide cavities 43 are connected with the second coolant outlet 41; by adopting this structure, each second coolant inlet can be reliably connected with the second coolant outlet.

[0037] An annular flow channel 44 is provided inside the front end cover 4, and the annular flow channel 44 is located on the inner side of all the second guide chambers 43. Each second guide chamber 43 is connected to the annular flow channel 44 through a second guide channel 45 located between the second guide chamber 43 and the annular flow channel 44, and the second coolant outlet 41 is connected to the annular flow channel 44. By providing the annular flow channel, and each second guide chamber is connected to the annular flow channel through the second guide channel located between the second guide chamber and the annular flow channel, each second guide chamber can be reliably connected to the second coolant outlet, that is, each second coolant inlet can be reliably connected to the second coolant outlet.

[0038] Each second cooling liquid inlet 42 is aligned with the middle of the corresponding second guide cavity 43; by adopting this structure, the cooling liquid after cooling the stator winding can evenly enter each second guide cavity through each second cooling liquid inlet and be collected by the second guide cavity.

[0039] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A stator assembly of an outer rotor motor, comprising an iron core support (1), a stator winding (2), a sealing sleeve (3), a front end cover (4) and a rear end cover (5); the stator winding (2) is sleeved on the outer side of the iron core support (1) and fixed to the iron core support (1); the sealing sleeve (3) is sleeved on the outer side of the stator winding (2); the front end cover (4) and the rear end cover (5) are respectively fixed on both sides of the iron core support (1) in the axial direction; the front end cover (4) and the rear end cover (5) are both circumferentially sealed with the iron core support (1); the two ends of the sealing sleeve (3) in the axial direction are respectively sleeved on the front end cover (4) and the rear end cover (5); the front end cover (4) and the rear end cover (5) are both circumferentially sealed with the sealing sleeve (3); the iron core support (1), the sealing sleeve (3), the front end cover (4) and the rear end cover (5) form a ring-shaped cooling cavity (6); the stator winding (2) is located in the cooling cavity (6); characterized in that: The rear end cover (5) is provided with a first coolant inlet (51), and the inner side of the rear end cover (5) is also provided with a plurality of first coolant outlets (52) which are distributed at intervals in the circumferential direction and are in communication with the first coolant inlet (51) and the cooling chamber (6); the front end cover (4) is provided with a second coolant outlet (41), and the inner side of the front end cover (4) is also provided with a plurality of second coolant inlets (42) which are distributed at intervals in the circumferential direction and are in communication with the second coolant outlet (41) and the cooling chamber (6).

2. The stator assembly of the outer rotor motor according to claim 1, characterized in that: A plurality of the first coolant outlets (52) and a plurality of the second coolant inlets (42) are offset one by one along the circumferential direction of the cooling cavity (6).

3. The stator assembly of the outer rotor motor according to claim 1 or 2, characterized in that: The front end cover (4) and the rear end cover (5) are both circumferentially sealed with the core support (1) via a first O-ring (7), and the front end cover (4) and the rear end cover (5) are both circumferentially sealed with the sealing sleeve (3) via a second O-ring (8).

4. The stator assembly of the outer rotor motor according to claim 1 or 2, characterized in that: The rear end cover (5) is provided with first guide cavities (53) corresponding to and connected to a plurality of the first coolant outlets (52) one by one, and each adjacent two first guide cavities (53) are connected via at least one first guide channel (54), and one of the first guide cavities (53) is connected to the first coolant inlet (51).

5. The stator assembly of the outer rotor motor according to claim 4, characterized in that: Every two adjacent first flow guide cavities (53) are connected via two first flow guide channels (54), and the two first flow guide channels (54) between every two adjacent first flow guide cavities (53) are respectively located at the inner edge and the outer edge of the first flow guide cavity (53).

6. The stator assembly of the outer rotor motor according to claim 5, characterized in that: The width of the first flow guiding channel (54) near the inner edge of the first flow guiding cavity (53) is greater than the width of the first flow guiding channel (54) near the outer edge of the first flow guiding cavity (53).

7. The stator assembly of the outer rotor motor according to claim 4, characterized in that: Each of the first coolant outlets (52) is aligned with the middle of the corresponding first flow guide cavity (53).

8. The stator assembly of the outer rotor motor according to claim 1 or 2, characterized in that: The front end cover (4) is provided with a second guide cavity (43) corresponding to and connected with a plurality of second coolant inlets (42) one by one, and all the second guide cavities (43) are connected with the second coolant outlet (41).

9. The stator assembly of the outer rotor motor according to claim 8, characterized in that: An annular flow channel (44) is provided inside the front end cover (4), and the annular flow channel (44) is located on the inner side of all the second flow guide cavities (43). Each of the second flow guide cavities (43) is connected to the annular flow channel (44) via a second flow guide channel (45) located between the second flow guide cavity (43) and the annular flow channel (44), and the second coolant outlet (41) is connected to the annular flow channel (44).

10. The stator assembly of the outer rotor motor according to claim 8, characterized in that: Each of the second coolant inlets (42) is aligned with the middle of the corresponding second flow guide cavity (43).

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