Stator assembly, stator assembly assembling method, motor and electronic expansion valve

Abstract

The invention provides a stator assembly which comprises at least three stator units, each stator unit serves as an independent phase of the stator assembly, the at least three stator units are sequentially arranged and fixedly connected in the axial direction of the stator assembly, each stator unit comprises a limiting unit, and each limiting unit comprises a positioning part and a limiting part. The limiting part comprises a first limiting part and a second limiting part, and the positioning part is matched with the first limiting part or the second limiting part in a limiting mode. When the at least three-phase stator assembly is assembled, the generality of the stator unit can be realized, the cost of the stator assembly can be reduced, and the cost of the motor can be reduced.

Description

[Technical Field]

[0001] This application relates to the field of fluid control technology, specifically to a stator assembly and a method for assembling the stator assembly, a motor, and an electronic expansion valve. [Background Technology]

[0002] Claw pole motors come in single-phase, two-phase, three-phase, or more than three-phase forms. For three-phase and more than three-phase claw pole motors, how to reduce the cost of claw pole motors is a technical issue that needs to be considered by those skilled in the art. [Summary of the Invention]

[0003] The purpose of this invention is to provide a stator assembly, a method for assembling the stator assembly, a motor, and an electronic expansion valve, which helps to reduce the cost of the stator assembly, thereby reducing the cost of the claw pole motor, and further reducing the cost of the electronic expansion valve.

[0004] To achieve the above objectives, one embodiment provided in this application adopts the following technical solution: a stator assembly, the stator assembly including at least three stator units, each stator unit as a separate phase of the stator assembly, the at least three stator units are arranged sequentially and fixedly connected along the axial direction of the stator assembly, the stator unit includes a limiting unit, the limiting unit includes a positioning part and a limiting part, the limiting part includes a limiting part one and a limiting part two, the positioning part cooperates with the limiting part one or the limiting part two for limiting.

[0005] In one embodiment of this application, a stator assembly includes at least three stator units, each stator unit serving as a separate phase of the stator assembly. The at least three stator units are arranged sequentially and fixedly connected along the axial direction of the stator assembly. Each stator unit includes a limiting unit, comprising a positioning part and a limiting part. The limiting part includes a first limiting part and a second limiting part, with the positioning part engaging with either the first or second limiting part for limiting. By adjusting the state of each stator unit, different assembly requirements can be met, facilitating the versatility of the stator units and thus reducing the cost of the stator assembly and consequently, the cost of the motor.

[0006] One embodiment of this application also provides a method for assembling a stator assembly: a method for assembling a stator assembly.

[0007] Provide at least three stator units, and define three adjacent stator units as the first stator unit, the second stator unit, and the third stator unit;

[0008] Adjust the state of the stator unit: adjust the positioning part of the first stator unit to be in contact with the second limiting part of the first stator unit; adjust the positioning part of the second stator unit to be in contact with the second limiting part of the second stator unit; adjust the positioning part of the third stator unit to be in contact with the first limiting part of the third stator unit.

[0009] Assemble the stator assembly: The reverse side of the first stator unit is fixedly connected to the reverse side of the second stator unit, and the front side of the second stator unit is fixedly connected to the reverse side of the third stator unit. This method increases the versatility of the stator units, thereby helping to reduce the cost of the stator assembly.

[0010] One embodiment provided in this application employs the following technical solution: an electric motor, including a stator assembly and a rotor assembly as described above. This approach advantageously increases the versatility of the stator unit, thereby reducing the cost of the electric motor.

[0011] One embodiment provided in this application employs the following technical solution: an electronic expansion valve, comprising a stator assembly, a rotor assembly, a valve body, and a valve core as described above. This approach increases the versatility of the stator unit, thereby reducing the cost of the electronic expansion valve. [Attached Image Description]

[0012] Figure 1 This is a three-dimensional structural schematic diagram of the first embodiment of the electronic expansion valve of this application;

[0013] Figure 2 yes Figure 1 A perspective view of the first embodiment of the middle stator assembly;

[0014] Figure 3 yes Figure 2 Schematic diagram of the exploded structure of the middle stator assembly;

[0015] Figure 4 yes Figure 3 A top view of the stator unit structure from one direction;

[0016] Figure 5 yes Figure 4 Exploded view of the first embodiment of the middle stator unit;

[0017] Figure 6 yes Figure 5 A schematic diagram of the enlarged structure at point I;

[0018] Figure 7 yes Figure 2 A three-dimensional structural diagram showing the insulating frame and the support fixed together;

[0019] Figure 8 yes Figure 2A three-dimensional structural diagram of the middle stator unit in one direction;

[0020] Figure 9 yes Figure 2 A three-dimensional structural diagram of the middle stator unit in another direction;

[0021] Figure 10 yes Figure 9 Schematic diagram of the AA section structure along the middle;

[0022] Figure 11 yes Figure 2 A three-dimensional structural diagram of the outer shell of the middle claw pole in one direction;

[0023] Figure 12 yes Figure 2 A three-dimensional structural diagram of one embodiment where the connecting plate assembly and the stator assembly are not welded together;

[0024] Figure 13 This is a cross-sectional schematic diagram of an electric motor;

[0025] Figure 14 yes Figure 2 Schematic diagram of the explosion structure of the middle stator assembly in one direction;

[0026] Figure 15 yes Figure 2 A schematic diagram of the explosion structure of the middle stator assembly in another direction;

[0027] In the attached diagram: 100, electronic expansion valve; 100', motor;

[0028] 11. Valve body; 12. Valve core; 13. Valve port; 14. Rotor assembly; 15. Sleeve;

[0029] 16. Stator assembly; 161. Stator unit; 1611. Main body; 1611a. Housing; 1611b. Receiving cavity; 1611c. Claw pole housing; 1611d. Claw pole plate; 1611v. Grounding part; 1611x. Body part; 1611r. Peripheral part; 1611s. End; 1611t. Claw pole tooth; 1611u. Notch; 1611e. Stator winding; 1611f. Insulating frame; 1611g. Winding; 1611h. Winding part; 1611i. Stop; 1611j. First terminal end; 1611k. Second terminal end; 1611m. Inner hole; 1611n. Front stop; 1611p. Rear stop;

[0030] 1612, Support part; 1612a, First part; 1612b, Second part; 1612c, Groove;

[0031] 1612f, Support end; 1612e, Support shaft;

[0032] 1613, Conductive part; 1613a, First section; 1613b, First fixing section; 1613c, Second section; 1614, Fixing part; 1615, Mating part; 1615a, Mating part one; 1615b, Mating part two; 1616, Front; 1617, Back; 1618, Positioning part; 1619, Limiting part; 1619a, Limiting part one; 1619b, Limiting part two; 1619c, Waist-shaped groove; 1620, First position; 1621, Second position; 1622, Fixing groove; 1622a, Fixing groove one; 1622b, Fixing groove two;

[0033] 1623, First stator unit; 1624, Second stator unit; 1625, Third stator unit; 17, Connecting plate assembly; 171, First connecting part; 172, Second connecting part; 173, Third connecting part; 174, Fourth connecting part; 175, Fifth connecting part; 18, First component;

[0034] 163. Limiting unit;

[0035] 164. Fixed positioning part.

Detailed Implementation Methods

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0037] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings. First, it should be noted that the directional terms such as up, down, left, right, front, back, inner side, outer side, top, and bottom mentioned or possibly mentioned in this specification are defined relative to the structures shown in the corresponding drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0038] In refrigeration systems, throttling elements are used to control the flow rate of refrigerant. The throttling elements mainly control the flow rate of refrigerant based on changes in the system's superheat. Since electronic expansion valves control the flow rate of refrigerant by electromagnetic drive, this electromagnetic drive method has relatively high sensitivity, which helps to improve the accuracy of flow control. In order to improve the accuracy of flow control, electronic expansion valves are gradually being used as throttling elements in fields such as automotive air conditioning systems, heat pump systems, and battery cooling systems.

[0039] Please refer to Figure 1As shown, the electronic expansion valve 100 includes a valve body 11, a valve core 12, a rotor assembly 14, and a stator assembly 16. The electronic expansion valve 100 also has a valve port 13, which connects to flow channels located on both sides of the valve port 13. The stator assembly 16 is fitted around the outer periphery of the rotor assembly 14. In this embodiment, a sleeve 15 is provided between the stator assembly 16 and the rotor assembly 14 to isolate them. The stator assembly 16 is electrically connected and / or signal connected to a circuit board. When the electronic expansion valve 100 is working, it controls... The current in the winding 1611g of the stator assembly 16 changes according to a predetermined pattern, thereby controlling the stator assembly 16 to generate a changing excitation magnetic field. The rotor assembly 14 rotates under the action of the excitation magnetic field, and the rotor assembly 14 can drive the valve core 12 to move relative to the valve port 13 and adjust the opening of the valve port 13. In this way, the rotor assembly 14 can drive the valve core 12 to move relative to the valve port 13 through electromagnetic drive. This electromagnetic drive method has relatively high response sensitivity, which is beneficial to improving the control accuracy of flow.

[0040] Currently, electronic expansion valves use two-phase claw-pole motors to drive and control the refrigerant flow. However, as the requirements for refrigerant flow control accuracy become increasingly stringent, electronic expansion valves are being designed from two-phase claw-pole motors to multi-phase claw-pole motors, such as three-phase or more. When designing three-phase or more claw-pole motors, how to reduce costs is a technical issue that those skilled in the art need to consider.

[0041] As one implementation method, please refer to Figures 2 to 15 As shown, a stator assembly 16 includes at least three stator units 161, each stator unit 161 serving as a separate phase of the stator assembly 16. The at least three stator units 161 are arranged sequentially and fixedly connected along the axial direction of the stator assembly 16. Each stator unit 161 includes a limiting unit 163, which includes a positioning part 1618 and a limiting part 1619. The limiting part 1619 includes a first limiting part 1619a and a second limiting part 1619b. The positioning part 1618 engages with either the first limiting part 1619a or the second limiting part 1619b for limiting. In this way, when assembling the stator assembly 16 to form at least three phases, the state of the stator units can be adjusted to meet different customer needs, facilitating the versatility of the stator units 161 and thus reducing the cost of the stator assembly 16 and consequently, the cost of the motor.

[0042] In this embodiment, please refer to Figure 2 and Figure 3As shown, the stator assembly 16 includes three stator units 161, defined as a first stator unit 1623, a second stator unit 1624, and a third stator unit 1625. Along the axial direction of the stator assembly 16, the first stator unit 161 is located on one side of the second stator unit 161, and the third stator unit 161 is located on the other side of the second stator unit 161. The first stator unit 161 is fixedly connected to the second stator unit 161, and the second stator unit 161 is fixedly connected to the third stator unit 161. The fixed connection methods include, but are not limited to, bonding, riveting, welding, and snap-fitting. Specifically, each stator unit 161 includes a front side 1616 and a back side 1617, and three adjacent stator units 161 are defined as the first stator unit 1623, the second stator unit 1624, the third stator unit 1625, the fourth stator unit 1626, the fifth stator unit 1627, the eleventh stator unit 1628, the eleventh stator unit 1629, the eleventh stator unit 1621, the eleventh stator unit 1629, the eleventh stator unit 1621, the eleventh stator unit 1621, the eleventh stator unit 1625, the eleventh stator unit 1626 ...

[0043] The first stator unit 161 and the third stator unit 161 are fixedly connected; the front side 1616 of the second stator unit 161 is fixedly connected to the back side 1617 of the third stator unit 161, and the back side 1617 of the first stator unit 161 is fixedly connected to the back side 1617 of the second stator unit 161. This arrangement simplifies the structure of the conductive components electrically connected to the stator assembly 16, laying a foundation for reducing the cost of the stator assembly 16.

[0044] As one implementation method, please refer to Figure 2 and Figure 3 , Figure 14 and Figure 15 As shown, the stator assembly includes three stator units 161, defined as a first stator unit 1623, a second stator unit 1624, and a third stator unit 1625. The positioning part 1618 of the first stator unit 1623 is in a limiting engagement with the limiting part 1619b of the first stator unit 1623; the positioning part 1618 of the second stator unit 1624 is in a limiting engagement with the limiting part 1619b of the second stator unit 1624; and the positioning part 1618 of the third stator unit 1625 is in a limiting engagement with the limiting part 1619a of the third stator unit 1625. This design facilitates the manufacturing and processing of the stator assembly; for example, it makes it easier to control the condition of components on the assembly site.

[0045] As one implementation method, please refer to Figures 2 to 15 As shown, the stator unit 161 includes a housing 1611a and a stator winding 1611e. The housing 1611a has a receiving cavity 1611b, and at least a portion of the stator winding 1611e is located in the receiving cavity 1611b. The stator winding 1611e includes an insulating frame 1611f. One of the positioning part 1618 and the limiting part 1619 is located in the insulating frame 1611f, and the other of the positioning part 1618 and the limiting part 1619 is located in the housing 1611a. This arrangement is more conducive to the processing and manufacturing of the stator unit.

[0046] Furthermore, as one implementation method, please refer to Figures 2 to 7 As shown, the insulating frame 1611f includes a stop 1611i, and a positioning part 1618 protrudes from the stop 1611i away from the stop 1611i. The stator unit 161 includes a housing 1611a, and the housing 1611a includes a body part 1611x. Along the axial direction of the stator unit 161, the stop 1611i and the body part 1611x are projected onto a plane parallel to the body part 1611x. The projection of the stop 1611i and the projection of the body part 1611x at least partially coincide. Along a direction perpendicular to the body part 1611x, a limiting part 1619 penetrates the body part 1611x. This arrangement simplifies the structure of the stator assembly.

[0047] For a more specific implementation method, please refer to Figures 2 to 15 As shown, the housing 1611a includes a claw electrode outer shell 1611c and a claw electrode plate 1611d. The claw electrode outer shell 1611c includes a peripheral portion 1611r and an end portion 1611s. The end portion 1611s is located at one end of the peripheral portion 1611r. The claw electrode plate 1611d is fixedly connected to the other end of the peripheral portion 1611r. The body portion 1611x is formed on the claw electrode plate 1611d. Along a direction perpendicular to the claw electrode plate 1611d, a limiting portion 1619 penetrates the claw electrode plate 1611d. The insulating frame 1611f includes a winding portion 1611. h, the stop portion 1611i includes a front stop portion 1611n and a rear stop portion 1611p. The front stop portion 1611n is located at one end of the winding portion 1611h, and the rear stop portion 1611p is located at the other end of the winding portion 1611h. The stop portion 1611i extends radially along the insulating frame 1611f and axially along the stator unit 161. The rear stop portion 1611p is closer to the claw pole plate 1611d relative to the front stop portion 1611n. The positioning portion 1618 protrudes from the rear stop portion 1611p and moves away from it. In this way, the structure of the stator assembly is more compact, which is beneficial for achieving miniaturized design of the stator assembly. For more details, please refer to... Figures 2 to 4 , Figure 15 As shown, the limiting part is an oblong groove 1619c. Along the direction perpendicular to the claw plate 1611d, the oblong groove 1619c penetrates the claw plate 1611d. The oblong groove 1619c includes a limiting part 1619a and a limiting part 1619b.

[0048] As a specific implementation method, please refer to Figures 2 to 11As shown, the stator assembly 16 includes at least three stator units 161. Each stator unit 161 includes a main body 1611, a support portion 1612, and a conductive portion 1613. Along the radial direction of the stator unit 161, at least a portion of the support portion 1612 is disposed radially outside the main body 1611. The support portion 1612 is fixedly connected to the main body 1611, and the conductive portion 1613 is fixedly connected to the support portion 1612. By disposing the support portion 1612 radially outside the main body 1611, it is beneficial to achieve miniaturization of the stator assembly 16 in the axial direction.

[0049] For details, please refer to Figures 4 to 6 As shown, the main body 1611 includes a stator winding 1611e, which includes an insulating frame 1611f and a winding 1611g. The winding 1611g is wound around the insulating frame 1611f, and the support 1612 is fixedly connected to the insulating frame 1611f. Specifically, the support 1612 and the insulating frame 1611f are an integral structural component, which simplifies the structure of the insulating frame 1611f. In a specific embodiment, the conductive part 1613 includes a first segment 1613a, a first fixing segment 1613b, and a second segment 1613c. The first fixing segment 1613b is fixedly connected to the main body 1611, specifically, the first fixing segment 1613b is fixed to the main body 1611 by injection molding. This method helps reduce the number of parts, thereby reducing the manufacturing steps of the stator assembly 16.

[0050] More specifically, as one implementation method, please refer to Figure 6 and Figure 7 As shown, the integrated structural component formed by the support portion 1612 and the insulating frame 1611f is defined as the first component 18. The first component 18 is injection molded with at least one conductive portion 1613 as an insert. The conductive portion 1613 includes a first segment 1613a, a first fixing segment 1613b, and a second segment 1613c. The first fixing segment 1613b connects the first segment 1613a and the second segment 1613c. The first fixing segment 1613b is injection molded and fixed to the first component 18. The first segment 1613a extends along the axial direction of the stator assembly, and the second segment 1613c extends along the radial direction of the stator assembly. This method simplifies the assembly steps and facilitates the processing and manufacturing of the stator unit. The first segment 1613a is used for electrical connection with the winding, and the second segment 1613c is used for electrical connection with the connecting plate assembly.

[0051] For a specific implementation method, please refer to Figures 4 to 7As shown, the main body 1611 includes a housing 1611a and a stator winding 1611e. The stator winding 1611e includes an insulating frame 1611f and a winding 1611g. The insulating frame 1611f includes a winding portion 1611h and a stop portion 1611i. The winding portion 1611h has a cylindrical structure. The stop portion 1611i includes a front stop portion 1611n and a rear stop portion 1611p. The front stop portion 1611n is located at one end of the winding portion 1611h, and the rear stop portion 1611p is located at the other end of the winding portion 1611h. The stop portion 1611i extends along the radial direction of the insulating frame 1611f. The winding 1611g is wound around the winding portion 1611h. The support portion 1612 is fixedly connected to the rear stop portion 1611p, or the support portion 1612 and the rear stop portion 1611p are an integral structural component. To facilitate winding, the support portion 1612 is provided to protrude from the side of the rear stop portion 1611p away from the rear stop portion 1611p along the axial direction of the stator assembly. In this way, the support strength of the support portion 1612 is improved, which is also beneficial for winding the winding portion 1611h.

[0052] For one specific implementation method, please refer to Figure 5 , Figures 8 to 10 As shown, in one specific embodiment, the housing 1611a includes a claw pole outer shell 1611c and a claw pole plate 1611d, with the claw pole outer shell 1611c and the claw pole plate 1611d fixedly connected. Specifically, the methods of fixed connection between the claw pole outer shell 1611c and the claw pole plate 1611d include, but are not limited to, adhesive fixing, snap-fit ​​fixing, welding fixing, or riveting fixing. In this embodiment, the claw pole outer shell 1611c and the claw pole plate 1611d are riveted, which facilitates the manufacturing and processing of the stator assembly 16. After the claw pole outer shell 1611c and the claw pole plate 1611d are fixedly connected, a receiving cavity 1611b is formed, and the stator winding 1611e is located in the receiving cavity 1611b. Along the axial direction of the stator assembly, the rear stop 1611p is closer to the claw pole plate 1611d than the front stop 1611n.

[0053] More specifically, as one implementation method, please refer to Figures 7 to 11As shown, the claw pole housing 1611c includes an end portion 1611s and a peripheral portion 1611r. The end portion 1611s is located at one end of the peripheral portion 1611r. The claw pole housing 1611c includes claw pole teeth 1611t, which include multiple sub-parts. These sub-parts are evenly arranged along the circumferential direction of the claw pole housing 1611c. Along the radial direction of the claw pole housing 1611c, the claw pole teeth are located radially inside the peripheral portion 1611r. The claw pole teeth 1611t and the end portion 1611s are fixedly connected. The winding portion 1611h of the insulating frame 1611f has an inner hole 1611m, and the claw pole teeth are located in the inner hole 1611m. Thus, the claw pole teeth 1611t can serve as a reference for the rotation of the stator winding 1611e along the circumferential direction of the claw pole housing 1611c, facilitating subsequent stator assembly assembly.

[0054] In this embodiment, please refer to Figures 5 to 11 As shown, the claw electrode housing 1611c has a notch 1611u. Along the radial direction of the claw electrode housing 1611c, the notch 1611u penetrates the periphery 1611r. Along the axial direction of the claw electrode housing 1611c, the notch 1611u extends from the side of the periphery 1611r towards the end 1611s of the claw electrode housing 1611c. In one specific embodiment, along the axial direction of the claw electrode housing 1611c, the notch 1611u extends from the side of the periphery 1611r towards the end 1611s of the claw electrode housing 1611c, and along the axial direction of the claw electrode housing 1611c, the notch 1611u at least extends beyond the rear stop 1611p. It is understandable that part of the winding 1611g is not covered by the claw pole housing 1611c. In this way, the notch 1611u can serve as a feed port for subsequent processes, such as the stator assembly 16 as an insert for injection molding, which is beneficial for fixing the winding 1611g during injection molding. The winding 1611g includes a first terminal 1611j and a second terminal 1611k, which are led out along the notch. It should be noted that the first terminal 1611j and the second terminal 1611k are the ends of the enameled wire after each phase winding 1611g is wound. The first terminal 1611j is defined as the beginning end of the enameled wire after each phase winding 1611g is wound, and the second terminal 1611k is the end end of the enameled wire after each phase winding 1611g is wound.

[0055] As one implementation method, please refer to Figures 8 to 11As shown, the stator unit 161 includes a grounding portion 1611v, which extends from the outer surface of the peripheral portion 1611r in a direction away from the peripheral portion 1611r. The grounding portion 1611v is fixedly connected to the peripheral portion 1611r, or the grounding portion 1611v and the peripheral portion 1611r are integral structural components. In this embodiment, the grounding portion 1611v and the peripheral portion 1611r are integral structural components, formed by bending a portion of the peripheral portion 1611r. Multiple stator units 161 each have a grounding portion 1611v. When multiple stator units 161 are fixedly connected, multiple claw pole housings 1611c contact and are fixedly connected. The end of the grounding portion 1611v is electrically connected to the connecting plate assembly 17. This method helps improve the EMC of the stator assembly 16.

[0056] As one implementation method, please refer to Figures 2 to 11 As shown, the support portion 1612 includes a support end portion 1612f, which is used to support the connecting plate assembly 17. To simplify the connecting plate assembly 17 and facilitate its assembly, the support ends 1612f of multiple stator units 161 need to be arranged on the same plane. The stator unit 161 includes a positioning portion 1618 and a limiting portion 1619. One of the positioning portion 1618 and the limiting portion 1619 is located in the insulating frame 1611f, and the other of the positioning portion 1618 and the limiting portion 1619 is located in the housing 1611a. The positioning portion 1618 is located inside the limiting portion 1619 and can rotate within the limiting portion 1619 along the circumferential direction of the stator unit 161. In this way, the insulating frame 1611f can be adjusted appropriately so that the end surfaces of the support portions 1612 of the multiple stator units 161 are on the same plane. This has two advantages: first, it facilitates the assembly of the connecting plate assembly 17; second, it helps to simplify the structure of the connecting plate assembly 17. For example, the structure of the connecting plate assembly 17 can be set as a planar plate structure, which facilitates the manufacturing of the connecting plate assembly 17 and helps to reduce the processing cost of the connecting plate assembly 117.

[0057] As one implementation method, please refer to Figures 5 to 9 As shown, the positioning part 1618 includes a plurality of parts. Along the axial direction of the stator unit 161, at least one positioning part 1618 protrudes from the claw pole plate 1611d. The positioning part protruding from the claw pole plate 1611d is defined as the fixed positioning part 164. The stator unit includes a fixing groove 1622. The fixed positioning part 164 of the stator unit 161 is limited and engaged with the fixing groove 1622 of the adjacent stator unit 161.

[0058] For one specific implementation method, please refer to Figures 5 to 9As shown, the positioning part 1618 extends from the end surface of the insulating frame 1611f in a direction away from the insulating frame 1611f. Specifically, the positioning part 1618 protrudes from the rear stop 1611p in a direction away from the rear stop 1611p. The limiting part 1619 is provided on the claw pole plate 1611d and extends through the claw pole plate 1611d along its thickness direction. In the radial direction of the stator unit 161, the positioning part 1618 and the limiting part 1619 are mutually limiting and engaging. In the circumferential direction of the stator unit 161, the positioning part 1618 can move within the limiting part 1619.

[0059] As one implementation method, please refer to Figures 2 to 11 As shown, along the circumferential direction of the stator unit 161, the extreme positions of the positioning part 1618 rotating within the limiting part 1619 are defined as the first position 1620 and the second position 1621. When the positioning part 1618 of the first stator unit 161 is at the first position 1620, the positioning part 1618 of the second stator unit 161 is at the second position 1621, and the positioning part 1618 of the third stator unit 161 is at the first position 1620, the end surfaces of the support part 1612 are on the same plane. In this way, when multiple stator units 161 are assembled, it is only necessary to control the position of the positioning part 1618 within the limiting part 1619. While ensuring that the support part 1612 is on the same plane, it is more conducive to facilitating the assembly of the stator units 161.

[0060] Please refer to Figures 2 to 11As shown, to further simplify the structure of components that mate with the stator assembly, such as the structure of the connecting plate assembly 17, as one implementation, the support portion 1612 includes a first portion 1612a and a second portion 1612b. The stator unit 161 includes two conductive portions, one of which is defined as the first conductive portion and the other as the second conductive portion. The first conductive portion is fixedly connected to the first portion 1612a, and the second conductive portion is fixedly connected to the second portion 1612b. The support portion 1612 includes a groove 1612c. The first portion 1612a of the first stator unit 161 is located in the groove 1612c of the second stator unit 161. The first part 1612a of the second stator unit 161 is located in the groove 1612c of the first stator unit 161. The stator unit 161 also includes a fixing groove 1622, which includes a first fixing groove 1622a and a second fixing groove 1622b. The first fixing groove 1622a is recessed on the front side 1616, and the second fixing groove 1622b is recessed on the back side 1617. The positioning part 1618 of the first stator unit 161 is limited and connected to the second fixing groove 1622b. The positioning part 1618 of the second stator unit 161 is limited and connected to the first fixing groove 1622a. The positioning part of the third stator unit 161 is limited and connected to the second fixing groove 1622b. In this way, firstly, the positioning of the stator unit 161 can be conveniently manufactured; secondly, when the positions of each stator unit 161 are adjusted, the end surfaces of the support part 1612 are located on the same support surface, which helps to simplify the structure of the connecting plate.

[0061] Please refer to Figures 2 to 15 As shown, when the end surfaces of the support portion 1612 are located on the same support surface, in order to reduce the rotation of the support portion 1612 in the circumferential direction, the positioning portion 1618 includes multiple portions. Along the axial direction of the stator unit 161, at least one positioning portion 1618 has its end protruding from the claw pole plate 1611d. The stator unit 161 also includes a fixing groove 1622, which includes a fixing groove part 1622a and a fixing groove part 1622b. The fixing groove part 1622a is located recessed on the front side 1616, and the fixing groove part 1622b is recessed on the back side 1617. The positioning portion 1618 of the first stator unit 161 is limitedly connected to the fixing groove part 1622b, the positioning portion 1618 of the second stator unit 161 is limitedly connected to the fixing groove part 1622b, and the fixing groove part 1622b of the third stator unit 161 is limitedly connected to the fixing groove part 1622b.

[0062] Please refer to Figures 2 to 15As shown, to facilitate the adjustment of the potential angle of each stator unit 161, for example, in this embodiment, the stator assembly 16 is a three-phase stator assembly 16, and the potential angles of each stator unit 161 need to differ from each other by 120°. To ensure that the potential angles of each phase stator unit 161 differ by 120°, as one implementation method, the stator unit 161 includes a fixing part 1614 and a mating part 1615. The mating part 1615 includes a mating part 1615a and a mating part 1615b. The fixing part 1614 is reversible. The first stator unit 1616 extends away from the reverse side 1617, and a mating part 1615a is recessed from the reverse side 1617 towards the reverse side 1617. A second mating part 1615b is recessed from the front side 1616 towards the front side 1616. The fixing part 1614 of the first stator unit 161 is in a limiting fit with the mating part 1615a of the second stator unit 161, and the fixing part 1614 of the third stator unit 161 is in a limiting fit with the second mating part 1615b of the second stator unit 161. This arrangement helps to ensure the phase difference electrical angle of each phase stator unit 161 during assembly. For example, the electrical angle of the three-phase stator unit 161 described above is 120°.

[0063] The following will introduce the connecting plate assembly 17:

[0064] Please refer to Figures 1 to 15 As shown, the connecting plate assembly 17 has a plate-like structure and includes an electrical connection portion. The electrical connection portion includes a first connection portion 171, a second connection portion 172, a third connection portion 173, and a fourth connection portion 174. One end of the first connection portion 171 is electrically connected to the beginning end of the winding of the first stator unit 161. One end of the second connection portion 172 is electrically connected to the beginning end of the winding of the second stator unit 161. One end of the third connection portion 173 is electrically connected to the beginning end of the winding of the third stator unit 161. One end of the fourth connection portion 174 is electrically connected to the ground portion 1611v. The electrical connection portion includes a fifth connection portion 175, which is electrically connected to the end of the winding 1611 of the first stator unit 161, the end of the winding of the second stator unit 161, and the end of the winding of the third stator unit 161, respectively.

[0065] The connecting plate assembly 17 includes a support hole 176, and the support part 1612 includes a support shaft 1612e. The support shaft 1612e is located in the support hole 176 and is used to position the connecting plate assembly 17.

[0066] Before the electrical connection parts are welded to the stator assembly, the connecting bracket 178 connects multiple electrical connection parts into an integral structural component. Specifically, the other ends of the first connection part, the second connection part, the third connection part, and the fourth connection part are electrically connected to the connecting bracket. After the electrical connection parts are welded to the stator assembly 16, the connecting bracket is disconnected from the first connection part, the second connection part, the third connection part, and the fourth connection part, so that the first connection part, the second connection part, the third connection part, and the fourth connection part are separated from each other. In this way, it is beneficial to reduce the deformation of the connecting plate assembly 17 during assembly.

[0067] Please refer to Figures 2 to 15 As shown, this application also discloses a method for assembling a stator assembly 16.

[0068] At least three stator units 161 are provided, and three adjacent stator units 161 are defined as the first stator unit 1623, the second stator unit 1624 and the third stator unit 1625, respectively.

[0069] Adjust the state of stator unit 161: Adjust the positioning part 1618 of the first stator unit 1623 to engage with the limiting part 1619b of the first stator unit 1623; adjust the positioning part 1618 of the second stator unit 1624 to engage with the limiting part 1619b of the second stator unit 1624; adjust the positioning part 1618 of the third stator unit 1625 to engage with the limiting part 1619a of the third stator unit 1625;

[0070] Assemble stator assembly 16: The reverse side of the first stator unit 1623 is fixedly connected to the reverse side of the second stator unit 1624, and the front side of the second stator unit 1624 is fixedly connected to the reverse side of the third stator unit 1625.

[0071] The above is merely an exemplary disclosure of the stator assembly applied to the field of electronic expansion valves. Referring to the figures, the stator assembly can also be applied to the field of motor technology. As one implementation method, as shown, this application provides an embodiment employing the following technical solution: a motor 100', including a stator assembly 16' and a rotor assembly 14'. This approach helps to reduce the cost of the motor 100'.

[0072] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A stator assembly (16), characterized in that: The stator assembly (16) includes at least three stator units (161), each stator unit (161) serving as a separate phase of the stator assembly (16). The at least three stator units (161) are arranged sequentially and fixedly connected along the axial direction of the stator assembly (16). Each stator unit (161) includes a limiting unit (163), which includes a positioning part (1618) and a limiting part (1619). The limiting part (1619) includes a limiting part one (1619a) and a limiting part two (1619b). The positioning part (1618) engages with the limiting part one (1619a) or the limiting part two (1619b) for limiting.

2. The stator assembly (16) according to claim 1, characterized in that... The stator assembly includes three stator units (161), defined as a first stator unit (1623), a second stator unit (1624), and a third stator unit (1625). The positioning part (1618) of the first stator unit (1623) is in a limiting cooperation with the limiting part (1619b) of the first stator unit (1623). The positioning part (1618) of the second stator unit (1624) is in a limiting cooperation with the limiting part (1619b) of the second stator unit (1624). The positioning part (1618) of the third stator unit (1625) is in a limiting cooperation with the limiting part (1619a) of the third stator unit (1625).

3. The stator assembly (16) according to claim 1 or 2, characterized in that... The stator unit (161) includes a housing (1611a) and a stator winding (1611e). The housing (1611a) has a receiving cavity (1611b), at least a portion of the stator winding (1611e) is located in the receiving cavity (1611b), and the stator winding (1611e) includes an insulating frame (1611f). One of the positioning part (1618) and the limiting part (1619) is located in the insulating frame (1611f), and the other of the positioning part (1618) and the limiting part (1619) is located in the housing (1611a).

4. The stator assembly (16) according to any one of claims 1 to 3, characterized in that... The insulating frame (1611f) includes a stop (1611i), and the positioning part (1618) protrudes from the stop (1611i) away from the stop (1611i). The stator unit (161) includes a housing (1611a), and the housing (1611a) includes a body part (1611x). Along the axial direction of the stator unit (161), the stop (1611i) and the body part (1611x) are projected onto a plane parallel to the body part (1611x). The projection of the stop (1611i) and the projection of the body part (1611x) at least partially coincide. Along a direction perpendicular to the body part (1611x), the limiting part (1619) penetrates the body part (1611x).

5. The stator assembly (16) according to claim 4, characterized in that The housing (1611a) includes a claw electrode shell (1611c) and a claw electrode plate (1611d). The claw electrode shell (1611c) includes a peripheral portion (1611r) and an end portion (1611s). The end portion (1611s) is located at one end of the peripheral portion (1611r). The claw electrode plate (1611d) is fixedly connected to the other end of the peripheral portion (1611r). The body portion (1611x) is formed on the claw electrode plate (1611d). Along a direction perpendicular to the claw electrode plate (1611d), the limiting portion (1619) penetrates the claw electrode plate (1611d). The insulating frame (1611f) includes a winding portion (1611h). The stop (1611i) includes a front stop (1611n) and a rear stop (1611p). The front stop (1611n) is disposed at one end of the winding part (1611h), and the rear stop (1611p) is disposed at the other end of the winding part (1611h). The stop (1611i) extends radially along the insulating skeleton (1611f) and axially along the stator unit (161). The rear stop (1611p) is closer to the claw pole plate (1611d) relative to the front stop (1611n). The positioning part (1618) protrudes from the rear stop (1611p) away from the rear stop (1611p).

6. The stator assembly (16) according to claim 5, characterized in that The limiting part is an oblong groove (1619c), which extends through the claw electrode plate (1611d) along a direction perpendicular to the claw electrode plate (1611d). The oblong groove (1619c) includes the limiting part one (1619a) and the limiting part two (1619b).

7. The stator assembly (16) according to claim 5 or 6, characterized in that... The positioning part (1618) includes a plurality of parts. Along the axial direction of the stator unit (161), at least one of the positioning parts (1618) protrudes from the claw pole plate (1611d). The positioning part protruding from the claw pole plate (1611d) is defined as the fixed positioning part (164). The stator unit includes a fixing groove (1622). The fixed positioning part (164) of the stator unit (161) is limited and engaged with the fixing groove (1622) of the adjacent stator unit (161).

8. The stator assembly (16) according to any one of claims 2 to 7, characterized in that... The stator unit (161) includes a main body (1611), a support (1612), and a conductive part (1613). The main body (1611) includes the housing (1611a) and the stator winding (1611e). The stator winding (1611e) includes the insulating frame (1611f). Along the radial direction of the stator unit (161), at least a portion of the support (1612) is disposed on the radially outer side of the main body (1611). The support (1612) is fixedly connected to the main body (1611), and the conductive part (1613) is fixedly connected to the support (1612).

9. The stator assembly (16) according to claim 8, characterized in that... Along the circumferential direction of the stator unit (161), the positioning part (1618) is defined to have a first position (1620) and a second position (1621) at the movement limit position of the limiting part (1618). When the positioning part (1618) of the first stator unit (1623) is at the first position (1620), when the positioning part (1618) of the second stator unit (1624) is at the first position (1621), and when the positioning part (1618) of the third stator unit (1625) is at the second position (1620), the end surface of the support part (1612) is the same.

10. The stator assembly (16) according to any one of claims 2 to 9, characterized in that... The stator unit (161) includes a fixing part (1614) and a mating part (1615). The mating part (1615) includes a mating part one (1615a) and a mating part two (1615b). The stator unit (16) includes a front side (1616) and a back side (1617). The fixing part (1614) protrudes from the back side (1617) in a direction away from the back side (1617). The mating part one (1615a) protrudes from the back side (1617) in a direction closer to the back side (1617). The first stator unit (1623) has a fixed part (1614) that is inwardly recessed in the direction of the first stator unit (1623) and the second stator unit (1624) has a limiting fit with the first part (1615a) of the second stator unit (1624), and the third stator unit (1625) has a fixed part (1614) that is inwardly recessed in the direction of the first stator unit (1616) and the second part (1615b) of the second stator unit (1624) has a limiting fit with the second stator unit (1624).

11. A method for assembling a stator assembly (16), characterized in that: At least three stator units (161) are provided, and three adjacent stator units (161) are defined as the first stator unit (1623), the second stator unit (1624) and the third stator unit (1625); Adjust the state of the stator unit (161): adjust the positioning part (1618) of the first stator unit (1623) to be in a limiting engagement with the limiting part (1619b) of the first stator unit (1623); adjust the positioning part (1618) of the second stator unit (1624) to be in a limiting engagement with the limiting part (1619b) of the second stator unit (1624); adjust the positioning part (1618) of the third stator unit (1625) to be in a limiting engagement with the limiting part (1619a) of the third stator unit (1625); Assemble the stator assembly (16): The reverse side of the first stator unit (1623) is fixedly connected to the reverse side of the second stator unit (1624), and the front side of the second stator unit (1624) is fixedly connected to the reverse side of the third stator unit (1625).

12. An electric motor (100'), characterized in that: Includes the stator assembly (16') and rotor assembly (14') as described in any one of claims 1 to 10.

13. An electronic expansion valve (100), characterized in that: It includes the stator assembly (16), rotor assembly (14), valve body (11), and valve core (12) as described in any one of claims 1 to 10.

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