Motor stator assembly structure

Abstract

The invention belongs to a motor stator assembly structure in the technical field of motors. A plurality of flow guide grooves (7) are formed in the iron core outer ring surface (6) along a circle, a plurality of gap portions (9) are formed in the machine shell inner wall (8) along a circle, the flow guide grooves (7) are communicated with a machine shell front cavity (10) and a machine shell rear cavity (11), and the machine shell front cavity (10), the machine shell rear cavity (11), the flow guide grooves (7) and the gap portions (9) are all arranged to be of a structure capable of being filled with resin materials to form a resin filling and sealing component (4). According to the motor stator assembly structure, the assembly structure of the stator and the casing is optimized, the dependence on interference assembly is reduced, the problem of motor fault caused by interference failure due to inconsistent heat conduction coefficients of the casing and the stator core is solved, the torque reliability of the motor is improved, and the overall performance of the motor is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and more specifically, relates to a motor stator assembly structure. Background Art

[0002] In the prior art, the connection between the motor housing and the stator is mainly interference fit. However, such a structure has serious defects. When the motor works in a high temperature environment, the interference fit fails easily due to the inconsistent thermal conductivity between the housing and the stator core, thus affecting the motor's performance. In the prior art, the motor has poor stator thermal conductivity, low fixed mode of the stator assembly, large deviations in coaxiality and verticality of the stator assembly, which easily causes NVH problems.

[0003] In the prior art, there is a technology named "Stator Structure and Motor" and the publication number is "CN117498582A", which provides a stator structure and a motor, wherein the stator structure includes a stator core and a stator winding formed by stacking a plurality of stator punching sheets, wherein the stator punching sheets include: a stator yoke portion, which is a first circular ring; a plurality of stator tooth portions, which include a plurality of first stator tooth portions and a plurality of second stator tooth portions arranged alternately; an angle a1 between the two ends of the stator tooth shoe of the first stator tooth portion and the center of the first circular ring is greater than an angle a2 between the two ends of the stator tooth shoe of the first stator tooth portion and the center of the second circular ring; The angle a2 between the two ends of the stator tooth shoe of the stator tooth portion and the center of the first circular ring; the stator core includes a plurality of stator tooth groups arranged at intervals around its own central axis, each stator tooth group includes a plurality of stator tooth portions stacked in sequence along the direction of the central axis of the stator core, and any two adjacent stator tooth portions in each stator tooth group are respectively the first stator tooth portion and the second stator tooth portion, so as to solve the problem in the prior art that the single-phase induction motor is prone to large vibration noise and poor starting ability due to the use of concentrated winding in the stator.

[0004] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the deficiencies in the prior art, a motor stator assembly structure with a simple structure is provided, which can effectively improve the NVH problems caused by poor thermal conductivity of the motor stator, low fixed mode, and large coaxiality and verticality deviations of the stator assembly in the traditional motor structure, and at the same time effectively optimize the assembly structure of the stator and the casing, reduce the dependence on interference fit, reduce the motor failure problem caused by interference fit failure due to inconsistent thermal conductivity coefficients between the casing and the stator core, improve the motor torque reliability, and improve the overall performance of the motor.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0007] The present invention discloses a motor stator assembly structure. A stator core is arranged in a casing. The stator core comprises an outer ring surface of the core. A plurality of guide grooves are arranged along a circle on the outer ring surface of the core. A plurality of gaps are arranged along a circle on the inner wall of the casing. One end of the stator core inside the casing is a front cavity of the casing. The other end of the stator core inside the casing is a rear cavity of the casing. The guide grooves connect the front cavity of the casing and the rear cavity of the casing. The front cavity of the casing is connected to an injection port. The front cavity of the casing, the rear cavity of the casing, the guide grooves and the gaps are all arranged to be capable of injecting resin material to form a resin-encapsulated component.

[0008] A casing front closing component is installed at one end of the casing, and a casing rear closing component is arranged at the other end of the casing. The casing rear closing component and the casing are an integrated structure.

[0009] The guide groove is arranged along the axial direction of the stator core, and the guide groove runs through the surface of the outer ring of the core. A plurality of guide grooves are arranged at intervals along the surface of the outer ring of the core.

[0010] The inner wall of the casing is provided with a plurality of gap portions along a circle, the gap portions are provided along the axial direction of the casing, the gap portions extend from the front cavity of the casing to the rear cavity of the casing, and the length of the gap portions overlapping the surface of the outer ring of the core is less than the length of the stator core.

[0011] The stator core is connected to the three-phase outgoing wires, and the three-phase outgoing wires penetrate the resin potting component of the cavity at the rear of the casing and extend to the outside of the casing.

[0012] The inner wall of the casing is connected with the outer ring surface of the iron core by interference fit.

[0013] The stator core is provided with windings.

[0014] The winding is wrapped in a resin potting component.

[0015] A resin potting layer is arranged between the stator iron core and the stator body.

[0016] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0017] The motor stator assembly structure described in the present invention is processed into a casing, and then a stator core is installed in the casing, the stator core is fixedly installed on the inner wall of the casing, the stator core includes an outer ring surface of the core, a plurality of guide grooves are arranged along a circle on the outer ring surface of the core, a plurality of gap portions are arranged along a circle on the inner wall of the casing, one end of the stator core inside the casing is a front cavity of the casing, and the other end of the stator core inside the casing is a rear cavity of the casing, the guide grooves connect the front cavity of the casing and the rear cavity of the casing, the front cavity of the casing is connected to the injection port, and the front cavity of the casing, the rear cavity of the casing, the guide grooves, and the gap portions are all arranged to be able to inject resin material to form a resin-encapsulated component. In this way, after the stator core is installed, the resin is poured from the injection port, and the resin is injected into the casing, and then the resin first enters the front cavity of the casing, and then enters the rear cavity of the casing from the guide groove, and at the same time, the resin enters the gap part, and finally, the resin completely fills the corresponding cavity between the casing and the stator, that is, the front cavity of the casing, the rear cavity of the casing, the guide groove, and the gap part are all poured with resin material to form a resin potting component, forming a reliable potting. In this way, the stator core and the casing body are connected by interference fit to ensure the reliability of the connection. The guide groove and the gap part are also filled with resin, which can reduce the degree of dependence of the connection between the stator core and the casing on pure interference fit; the guide groove facilitates the resin to flow from the front cavity of the casing to the rear cavity of the casing for filling during potting; the cavity between the casing and the stator body is completely potted as a whole, and the potted resin can make the heat conduction area larger and the thermal conductivity better; there is also resin in the guide groove, which effectively fixes the axial rotational freedom of the stator. The overall encapsulation structure of the stator effectively improves the overall mode of the motor and improves the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a brief description of the contents and symbols in the drawings of this specification:

[0019] Figure 1 It is a structural schematic diagram of the motor stator assembly structure according to the present invention;

[0020] The marks in the accompanying drawings are respectively: 1, casing; 2, stator core; 3, winding; 4, resin potting component; 5, three-phase outgoing line; 6, outer ring surface of core; 7, guide groove; 8, inner wall of casing; 9, gap part; 10, front cavity of casing; 11, rear cavity of casing; 12, injection port; 13, front closing component of casing; 14, rear closing component of casing; 15, stator body; 16, resin potting layer. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0022] As attached Figure 1As shown, the present invention is a motor stator assembly structure, a stator core 2 is arranged in a casing 1, the stator core 2 includes a core outer ring surface 6, a plurality of guide grooves 7 are arranged along a circle on the core outer ring surface 6, a plurality of gap portions 9 are arranged along a circle on the casing inner wall 8 of the casing 1, one end of the stator core 2 inside the casing 1 is a casing front cavity 10, and the other end of the stator core 2 inside the casing 1 is a casing rear cavity 11, the guide groove 7 connects the casing front cavity 10 and the casing rear cavity 11, the casing front cavity 10 is connected to the injection port 12, the casing front cavity 10, the casing rear cavity 11, the guide groove 7, and the gap portion 9 are all arranged to be able to inject resin material to form a resin potting component 4. The above structure proposes an improved technical solution to address the deficiencies in the prior art. When the structure is set, a casing 1 is processed, and then a stator core 2 is installed in the casing 1. The stator core 2 is fixedly installed on the casing inner wall 8. The stator core 2 includes an outer ring surface 6 of the core, and a plurality of guide grooves 7 are arranged along a circle on the outer ring surface 6 of the core. A plurality of gap portions 9 are arranged along a circle on the casing inner wall 8 of the casing 1. One end of the stator core 2 inside the casing 1 is a front cavity 10 of the casing, and the other end of the stator core 2 inside the casing 1 is a rear cavity 11 of the casing. The guide grooves 7 connect the front cavity 10 of the casing and the rear cavity 11 of the casing. The front cavity 10 of the casing is connected to the injection port 12. The front cavity 10 of the casing, the rear cavity 11 of the casing, the guide grooves 7, and the gap portions 9 are all arranged to be able to inject resin material to form a resin potting component 4. In this way, after the stator core 2 is installed, resin is poured from the injection port 12, the resin is injected into the interior of the casing, and then the resin first enters the front cavity 10 of the casing, and then enters the rear cavity 11 of the casing from the guide groove, and at the same time the resin enters the gap portion 9. Finally, the resin completely fills the corresponding cavities between the casing and the stator, that is, the front cavity 10 of the casing, the rear cavity 11 of the casing, the guide groove 7, and the gap portion 9 are all poured with resin material to form a resin potting component 4, thereby forming a reliable potting. In this way, the stator core 2 and the main body of the housing 1 are connected by interference fit to ensure the reliability of the connection. The guide groove 7 and the gap 8 are also filled with resin, which can reduce the degree of dependence of the connection between the stator core 2 and the housing 1 on pure interference fit; the guide groove 7 facilitates the flow of resin from the front cavity 10 of the housing to the rear cavity 11 of the housing for filling during potting; the cavity between the housing 1 and the stator body 15 is completely potted as a whole, and the potted resin can make the heat conduction area larger and the thermal conductivity better; there is also resin in the guide groove, which can effectively fix the axial rotational freedom of the stator. The structure of the overall potting of the stator effectively improves the overall mode of the motor and improves the reliability of the motor.The motor stator assembly structure described in the present invention has a simple structure and can effectively improve the NVH problems caused by poor thermal conductivity of the motor stator, low fixed mode, and large coaxiality and verticality deviations of the stator assembly in the traditional motor structure. At the same time, it can effectively optimize the assembly structure of the stator and the casing, reduce the dependence on interference fit, reduce the motor failure problem caused by interference failure due to inconsistent thermal conductivity coefficients between the casing and the stator core, improve the motor torque reliability, and improve the overall performance of the motor.

[0023] The housing front closing component 13 is installed at one end of the housing 1, and the housing rear closing component 14 is set at the other end of the housing 1. The housing rear closing component 14 and the housing 1 are an integrated structure. In the above structure, the housing rear closing component 14 and the housing 1 are an integrated structure, that is, the housing rear closing component 14 is integrally formed when the housing is processed. The processing technology is simple, and there is no need to connect the housing rear closing component 14 separately. The integrated structure ensures the structural strength. The front of the housing is used to install the corresponding components. It cannot be integrally formed, but is an open structure. After the corresponding components are installed inside the housing, the housing front closing component 13 is fixedly connected to achieve closure.

[0024] The guide groove 7 is arranged along the axial direction of the stator core 2, and the guide groove 7 penetrates the outer ring surface 6 of the core, and multiple guide grooves 7 are arranged along the outer ring surface 6 of the core at intervals. In the above structure, the setting of the guide groove 7, on the one hand, is used as a flow channel for resin, which is convenient for the resin to flow from the front cavity 10 of the casing into the rear cavity 11 of the casing during resin infusion, so as to achieve the infusion of the rear cavity 11 of the casing. On the other hand, after the infusion is completed, the guide groove 7 is also infused with resin, so that in addition to the interference fit of the main body between the electronic core and the inner wall of the casing, there is also a local resin connection, which reduces the dependence on the interference fit. Even if the interference fit fails due to the inconsistency of the thermal conductivity coefficients of the casing and the stator when the electronics work in a high temperature environment, the resin exists in the guide groove part 7 and the gap part 9, and the resin is not affected by the inconsistency of the thermal conductivity coefficients of the casing 1 and the stator, and still plays a role of reliable connection, ensuring the reliable performance of the motor.

[0025] The inner wall 8 of the housing 1 is provided with a plurality of gaps 9 along a circle according to the gaps. The gaps 9 are provided along the axial direction of the housing 1. The gaps 9 extend from the front cavity 10 of the housing to the rear cavity 11 of the housing. The length of the gaps 9 overlapping the outer ring surface 6 of the core is less than the length of the stator core 2. In the above structure, after potting, the gaps 9 are also potted with resin. In addition to the interference fit of the main body, there is also a local resin connection between the electronic core and the inner wall of the housing, which reduces the dependence on interference fit. Even if the interference fit fails due to the inconsistency of the thermal conductivity coefficients of the housing and the stator when the electronics are working in a high temperature environment, there is resin in the gap 9 and the guide groove 7, and the resin is not affected by the inconsistency of the thermal conductivity coefficients of the housing 1 and the stator, and still plays a role of reliable connection, ensuring the reliable performance of the motor.

[0026] The stator core 2 of the motor is connected to the three-phase outgoing line 5, which passes through the resin potting component 4 of the rear cavity 11 of the housing and extends to the outside of the housing 1. The stator core 2 is provided with a winding 3. The winding 3 is wrapped in the resin potting component 12.

[0027] The inner wall 8 of the housing is connected to the outer ring surface 6 of the core by interference fit. With the above structure, when the motor works in a non-high temperature environment, the interference fit state is not affected. When the motor works in a high temperature environment, even if the interference fit state is affected, it does not affect the overall reliability of the motor.

[0028] The gap between the stator core 2 and the stator body 15 is provided with a resin potting layer 16. In the above structure, the stator core is sleeved on the outer ring of the stator body, and the gap between the stator core and the outer ring of the stator body is completely potted with resin when the resin is poured, thereby realizing a reliable connection between the stator core 2 and the stator body 15 and improving the thermal conductivity of the stator body.

[0029] The motor stator assembly structure described in the present invention is processed into a casing 1, and then a stator core 2 is installed in the casing 1, the stator core 2 is fixedly installed with the casing inner wall 8, the stator core 2 includes a core outer ring surface 6, and a plurality of guide grooves 7 are arranged along a circle on the core outer ring surface 6, and a plurality of gap portions 9 are arranged along a circle on the casing inner wall 8 of the casing 1, one end of the stator core 2 inside the casing 1 is a casing front cavity 10, and the other end of the stator core 2 inside the casing 1 is a casing rear cavity 11, the guide groove 7 connects the casing front cavity 10 and the casing rear cavity 11, the casing front cavity 10 is connected to the injection port 12, and the casing front cavity 10, the casing rear cavity 11, the guide groove 7, and the gap portion 9 are all arranged to be able to inject resin material to form a resin potting component 4. In this way, after the stator core 2 is installed, resin is poured from the injection port 12, the resin is injected into the interior of the casing, and then the resin first enters the front cavity 10 of the casing, and then enters the rear cavity 11 of the casing from the guide groove, and at the same time the resin enters the gap portion 9. Finally, the resin completely fills the corresponding cavities between the casing and the stator, that is, the front cavity 10 of the casing, the rear cavity 11 of the casing, the guide groove 7, and the gap portion 9 are all poured with resin material to form a resin potting component 4, thereby forming a reliable potting. In this way, the stator core 2 and the main body of the housing 1 are connected by interference fit to ensure the reliability of the connection. The guide groove 7 and the gap 8 are also filled with resin, which can reduce the degree of dependence of the connection between the stator core 2 and the housing 1 on pure interference fit; the guide groove 7 facilitates the flow of resin from the front cavity 10 of the housing to the rear cavity 11 of the housing for filling during potting; the cavity between the housing 1 and the stator body 15 is completely potted as a whole, and the potted resin can make the heat conduction area larger and the thermal conductivity better; there is also resin in the guide groove, which effectively fixes the axial rotational freedom of the stator. The structure of the overall potting of the stator effectively improves the overall mode of the motor and improves the reliability of the motor.

[0030] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A motor stator assembly structure, characterized in that: A stator core (2) is arranged in the casing (1), the stator core (2) comprises a core outer ring surface (6), a plurality of guide grooves (7) are arranged along a circumference of the core outer ring surface (6), a plurality of gap portions (9) are arranged along a circumference of a casing inner wall (8) of the casing (1), one end of the stator core (2) in the casing (1) is a casing front cavity (10), the other end of the stator core (2) in the casing (1) is a casing rear cavity (11), and the guide grooves (7) are connected to the casing front cavity (10). The housing rear cavity (11) and the housing front cavity (10) are connected to the injection port (12); the housing front cavity (10), the housing rear cavity (11), the guide groove (7), and the gap portion (9) are all configured to be capable of injecting resin material to form a resin-encapsulated component (4); the guide groove (7) is axially arranged along the stator core (2); the guide groove (7) penetrates the core outer ring surface (6); and a plurality of guide grooves (7) are arranged at intervals along a circle on the core outer ring surface (6).

2. The motor stator assembly structure according to claim 1, characterized in that: A casing front closing component (13) is installed at one end of the casing (1), and a casing rear closing component (14) is arranged at the other end of the casing (1); the casing rear closing component (14) and the casing (1) are an integrated structure.

3. The motor stator assembly structure according to claim 1 or 2, characterized in that: The inner wall (8) of the casing (1) is provided with a plurality of gap portions (9) at intervals along a circumference, the gap portions (9) are provided along the axial direction of the casing (1), the gap portions (9) extend from the front cavity (10) of the casing toward the rear cavity (11) of the casing, and the length of the gap portions (9) overlapping the core outer ring surface (6) is less than the length of the stator core (2).

4. The motor stator assembly structure according to claim 1 or 2, characterized in that: The stator core (2) is connected to a three-phase outgoing line (5), and the three-phase outgoing line (5) passes through a resin potting component (4) in a cavity (11) at the rear of the casing and extends to the outside of the casing (1).

5. The motor stator assembly structure according to claim 1 or 2, characterized in that: The inner wall (8) of the casing is connected to the outer ring surface (6) of the iron core by interference fit.

6. The motor stator assembly structure according to claim 1 or 2, characterized in that: A winding (3) is arranged on the stator core (2).

7. The motor stator assembly structure according to claim 6, characterized in that: The winding (3) is wrapped in a resin potting component (4).

8. The motor stator assembly structure according to claim 1 or 2, characterized in that: A resin potting layer (16) is provided between the stator core (2) and the stator body (15).

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