Motor and electronic expansion valve

Abstract

The invention discloses a motor and an electronic expansion valve, and relates to the technical field of electronic expansion valves, the motor is used for the electronic expansion valve, and the motor comprises a rotor assembly which is connected with a valve needle of the electronic expansion valve to drive the valve needle to move; the stator assembly comprises a pole claw assembly, a separator and a coil assembly, the pole claw assembly comprises a pole claw main body and a connecting part which are connected, the pole claw main body is located in the separator, the separator is provided with a connecting hole, the connecting part penetrates through the connecting hole and is in sealed connection with the connecting hole, and the connecting part is connected with the coil assembly. The claw assembly and the separator define a first chamber within which the rotor assembly is located. According to the motor provided by the embodiment of the invention, the sealed first cavity is defined by the pole claw assembly and the separator to accommodate the rotor assembly, and the pole claw main body of the pole claw assembly is located in the separator, so that the distance between the outer peripheral surface of the rotor assembly and the pole claw main body can be shortened, the air gap of the motor is reduced, the magnetic leakage of the motor is reduced, and the performance of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic expansion valves, and more particularly to a motor and an electronic expansion valve. Background Art

[0002] Electronic expansion valves typically include a motor. Because the medium flows through the valve, the motor's interior requires sealing. In related art, improperly designed sealing components within the motor can lead to excessive air gaps, increased magnetic flux leakage, and reduced motor performance. Summary of the Invention

[0003] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a motor that is sealed by a pole claw assembly and a separator. The pole claw body of the pole claw assembly is located within the separator, shortening the distance between the outer peripheral surface of the rotor assembly and the pole claw body, thereby reducing the air gap of the motor, reducing magnetic flux leakage, and improving motor performance.

[0004] Another object of the present invention is to provide an electronic expansion valve having the above motor.

[0005] According to an embodiment of the present invention, a motor is used for an electronic expansion valve, and the motor includes: a rotor assembly, which is connected to the valve needle of the electronic expansion valve to drive the valve needle to move; a stator assembly, which includes a pole claw assembly, a partition and a coil assembly, and the pole claw assembly includes a connected pole claw body and a connecting part, the pole claw body is located in the partition, the partition is provided with a connecting hole, the connecting part is passed through the connecting hole and is sealed with the connecting hole, the connecting part is connected to the coil assembly, the pole claw assembly and the partition define a first chamber, and the rotor assembly is located in the first chamber.

[0006] According to the motor of an embodiment of the present invention, a sealed first chamber is defined by a pole claw assembly and a partition to accommodate the rotor assembly. The pole claw body of the pole claw assembly is located within the partition, which can shorten the distance between the outer peripheral surface of the rotor assembly and the pole claw body, thereby reducing the air gap of the motor, reducing the magnetic leakage of the motor, and improving the performance of the motor. Integrating the pole claw assembly and the partition into one can reduce the overall volume of the motor to achieve miniaturization of the motor.

[0007] In addition, the motor according to the above embodiment of the present invention may also have the following additional technical features: According to some embodiments of the present invention, the separator includes a sleeve located radially outside the pole claw body and a cover located on an axial side of the pole claw body, and the annular hole extending circumferentially along the rotor assembly between the sleeve and the cover is the connecting hole, and one axial end of the pole claw assembly is sealed to the cover and the other axial end is sealed to the valve seat of the electronic expansion valve.

[0008] According to some embodiments of the present invention, the pole claw body includes at least one pole claw group, the pole claw group includes two pole claws arranged along the axial direction, each pole claw includes a plurality of claw portions arranged along the circumferential direction and a yoke portion for connecting the plurality of claw portions, the connecting portion is provided on the radial outer side of the yoke portion, the claw portions of the two pole claws of the same pole claw group are staggered and plugged in, and the sleeve at least seals the gap between two adjacent pole claws.

[0009] According to some embodiments of the present invention, the sleeve extends continuously along the axial direction of the rotor assembly.

[0010] According to some embodiments of the present invention, the coil assembly includes a plurality of coils arranged along the axial direction, the pole claw groups are a plurality corresponding one-to-one to the plurality of coils, adjacent yokes of two adjacent pole claw groups are connected as one, the sleeves are a plurality corresponding one-to-one to the plurality of pole claw groups, and the annular holes extending circumferentially along the rotor assembly between adjacent sleeves are the connecting holes.

[0011] According to some embodiments of the present invention, there are multiple connecting parts, and the coil assembly also includes a magnetic frame and a coil. The magnetic frame includes multiple connecting and fitting parts arranged along the axial direction, and the multiple connecting and fitting parts extend radially and are connected one-to-one with the multiple connecting parts. The coil is arranged between two adjacent connecting and fitting parts.

[0012] According to some embodiments of the present invention, the motor further includes a housing, the housing is an injection-molded body and is injection-molded to wrap the coil assembly, and the separator is installed in the housing.

[0013] According to some embodiments of the present invention, a gap between the rotor assembly and the pole claw assembly is less than or equal to 0.3 mm.

[0014] The electronic expansion valve according to the embodiment of the present invention includes a motor according to the embodiment of the present invention.

[0015] According to some embodiments of the present invention, the electronic expansion valve further includes: a valve seat and a valve needle, wherein the valve seat is connected to the pole claw assembly and defines a second chamber, the second chamber has an opening connected to the outside for circulating the medium, and the valve needle is located in the second chamber and connected to the rotating shaft of the rotor assembly.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which: Figure 1 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present invention; Figure 2 yes Figure 1 Front view of Figure 3 yes Figure 2 Cross-sectional view along line AA; Figure 4 yes Figure 3 The middle circle shows a partial enlarged view of point B; Figure 5 is a cross-sectional view of a separator and a pole claw assembly according to an embodiment of the present invention; Figure 6 yes Figure 5 Exploded diagram; Figure 7 is a cross-sectional view of a housing and a coil assembly according to an embodiment of the present invention; Figure 8 yes Figure 7 Exploded diagram.

[0018] Reference numerals: Electronic expansion valve 1000; Motor 100; valve seat 200; second chamber 210; valve port 220; inlet 230; outlet 240; valve needle 300; transmission member 400; Rotor assembly 10; Rotating shaft 11; stator assembly 20; first chamber 201; Pole claw assembly 21; pole claw body 211; pole claw group 2111; pole claw 2112; claw portion 2113; yoke portion 2114; connecting portion 212; Partition 22; connecting hole 221; sleeve 222; cover 223; Coil assembly 23; coil 231; magnetic frame 232; connecting portion 2321; frame body 2322; upper frame 2323; lower frame 2324; Housing 30 ; axial direction F1 of rotor assembly 10 . DETAILED DESCRIPTION

[0019] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0022] The motor 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0023] Reference Figures 1-8 As shown, the motor 100 according to an embodiment of the present invention is used for an electronic expansion valve 1000, and the motor 100 may include a rotor assembly 10 and a stator assembly 20. The motor 100 may be a stepper motor or other types of motors, and the rotor assembly 10 may include a permanent magnet.

[0024] Specifically, the rotor assembly 10 is connected to the valve needle 300 of the electronic expansion valve 1000 to drive the valve needle 300 to move. The movement of the valve needle 300 can adjust the opening of the electronic expansion valve 1000 to throttle the medium (such as refrigerant) flowing through the electronic expansion valve 1000.

[0025] The stator assembly 20 includes a pole claw assembly 21, a separator 22, and a coil assembly 23. The pole claw assembly 21 includes a connected pole claw body 211 and a connecting portion 212. The pole claw body 211 is located within the separator 22. The separator 22 has a connecting hole 221. The connecting portion 212 extends through the connecting hole 221 and is sealed to the connecting hole 221, allowing the pole claw assembly 21 and separator 22 to be integrated into one body. For example, the connecting portion 212 can be sealed to the wall of the connecting hole 221. Of course, the pole claw assembly 21 can also be sealed to other areas of the separator 22. The sealing connection method can be welding (such as laser welding) or other connection methods.

[0026] The connecting portion 212 is connected to the coil assembly 23, forming a magnetic connection between the pole claw assembly 21 and the coil assembly 23. The pole claw assembly 21 and the separator 22 define a first chamber 201. The rotor assembly 10 is located within the first chamber 201, while the pole claw body 211 is located within the separator 22. This positions the pole claw body 211 between the rotor assembly 10 and the separator 22. This reduces the radial spacing between the pole claw assembly 21 and the outer circumference of the rotor assembly 10, resulting in a smaller air gap in the motor 100 and improved motor performance.

[0027] During the operation of the electronic expansion valve 1000, the motor 100 starts to work, a magnetic circuit is formed between the rotor assembly 10 and the stator assembly 20, and the rotor assembly 10 rotates to drive the valve needle 300 to move. By controlling the rotation of the rotor assembly 10, the movement of the valve needle 300 can be controlled to throttle the medium flowing through the electronic expansion valve 1000. However, the medium flowing through the electronic expansion valve 1000 may flow into the first chamber 201 where the rotor assembly 10 is located. Therefore, it is necessary to seal the first chamber 201 to reduce the risk of the medium flowing through the electronic expansion valve 1000 from the first chamber 201 to the outside world, such as the stator assembly 20, so that the medium flowing through the electronic expansion valve 1000 can flow as much as possible through the opening of the valve needle 300, protect the stator assembly 20, and ensure that the throttling working efficiency of the electronic expansion valve 1000 meets the requirements.

[0028] The pole claw assembly 21 and the separator 22 can seal the first chamber 201 while the pole claw body 211 is connected to the coil assembly 23. Specifically, by inserting the connecting portion 212 through the connecting hole 221, the connecting portion 212 can be connected to the coil assembly 23. This improves the sealed connection between the physical portion of the pole claw assembly 21, the physical portion of the separator 22, the connecting portion 212, and the connecting hole 221, thereby separating the first chamber 201 from the environment outside the first chamber 201, such as the stator assembly 20, and making it difficult for the medium in the first chamber 201 to leak outward, thereby improving the sealing performance. The stator assembly 20 is also less susceptible to damage from leaking medium, which is beneficial for protecting the stator assembly 20. The material of the pole claw assembly 21 can be a magnetic conductive material, and the material of the separator 22 can be a metallic non-magnetic conductive material, such as 304 stainless steel, 303 stainless steel, etc., so that the separator 22 can achieve a sealing effect, which is relatively low in cost.

[0029] In some related technologies, a sleeve seals the chamber containing the rotor assembly, preventing leakage of the medium flowing into the chamber. However, the sleeve is typically radially located between the pole claw assembly and the rotor assembly, requiring space between the pole claw assembly and the rotor assembly for installation. This increases the motor's air gap, resulting in an air gap greater than 0.6 mm (i.e., a distance of at least the thickness of the sleeve). This increases magnetic flux leakage, reduces magnetic field strength, and reduces motor performance.

[0030] In the present application, however, the separator 22 is integrated with the pole claw assembly 21, defining a first chamber 201 by the separator 22 and the pole claw assembly 21. The separator 22 and the pole claw assembly 21 jointly seal the first chamber 201 where the rotor assembly 10 is located, preventing the medium flowing into the first chamber 201 from leaking outward. The pole claw body 211 of the pole claw assembly 21 is located within the separator 22, and the rotor assembly 10 is located within the pole claw body 211. Therefore, there is no need to reserve space between the pole claw assembly 21 and the rotor assembly 10 to install a sleeve as in the related art. This allows the radial distance between the pole claw assembly 21 and the rotor assembly 10 to be shortened, significantly reducing the air gap of the motor 100, thereby reducing magnetic flux leakage from the motor 100 and increasing the magnetic field strength, which significantly improves the performance of the motor 100.

[0031] In addition, integrating the separator 22 and the pole claw assembly 21 into one can also reduce the overall volume of the separator 22 and the pole claw assembly 21 compared to the situation in the related art where the separator and the pole claw assembly are separate parts, so as to miniaturize the motor 100 and help reduce the cost of the motor 100.

[0032] According to the motor 100 of an embodiment of the present invention, a sealed first chamber 201 is defined by the pole claw assembly 21 and the partition 22 to accommodate the rotor assembly 10. The pole claw body 211 of the pole claw assembly 21 is located in the partition 22, which can shorten the distance between the outer peripheral surface of the rotor assembly 10 and the pole claw body 211, thereby reducing the air gap of the motor 100, reducing the magnetic leakage of the motor 100, and improving the performance of the motor 100. In addition, integrating the pole claw assembly 21 and the partition 22 into one can reduce the overall volume of the motor 100 to achieve miniaturization of the motor 100.

[0033] For example, in some embodiments of the present invention, Figure 1-Figure 4 As shown, the gap between the rotor assembly 10 and the pole claw assembly 21 is L, and L is less than or equal to 0.3 mm. Here, the gap between the rotor assembly 10 and the pole claw assembly 21 refers to the air gap of the motor 100, that is, the gap between the outer peripheral surface of the rotor assembly 10 and the pole claw assembly 21 in the radial direction. If L is too large, it will increase the magnetic leakage of the motor 100 and weaken the performance of the motor 100. The present application integrates the pole claw assembly 21 and the separator 22 into one body, and the pole claw body 211 is located in the separator 22, so that L≤0.3 mm, shortens the radial gap between the outer peripheral surface of the rotor assembly 10 and the pole claw assembly 21, and reduces the air gap of the motor 100, which is beneficial to improve the performance of the motor 100 by more than 30%, and greatly improves the performance of the motor 100. For example, L is 0.1 mm, 0.2 mm or 0.3 mm, etc.

[0034] like Figure 1-Figure 3 As shown, an electronic expansion valve 1000 according to an embodiment of the present invention includes a motor 100 according to an embodiment of the present invention. Because the motor 100 according to the embodiment of the present invention has the aforementioned beneficial technical effects, the electronic expansion valve 1000 according to the embodiment of the present invention defines a sealed first chamber 201 by means of the pole claw assembly 21 and the partition 22 to accommodate the rotor assembly 10. The pole claw body 211 of the pole claw assembly 21 is located within the partition 22, which can shorten the distance between the outer peripheral surface of the rotor assembly 10 and the pole claw body 211, thereby reducing the air gap of the motor 100, reducing magnetic flux leakage of the motor 100, and improving the performance of the motor 100. Furthermore, integrating the pole claw assembly 21 and the partition 22 into one body can reduce the overall volume of the motor 100, thereby achieving miniaturization of the motor 100.

[0035] In some embodiments, as Figure 1-Figure 3As shown, the electronic expansion valve 1000 further includes a valve seat 200 and a valve needle 300. The valve seat 200 is connected to the pole claw assembly 21 to further seal the first chamber 201 through the valve seat 200, thereby improving the sealing performance of the first chamber 201. The valve seat 200 defines a second chamber 210, which has an opening connected to the outside world for the flow of medium. The valve needle 300 is located in the second chamber 210 and is connected to the rotating shaft 11 of the rotor assembly 10. There can be multiple openings, each of which can serve as the inlet 230 or outlet 240 of the electronic expansion valve 1000. This application does not limit the number or position of the inlets 230 and outlets 240. It is sufficient that at least one opening serves as the inlet 230 and at least one opening serves as the outlet 240.

[0036] The rotation of the rotor assembly 10 causes the rotating shaft 11 to rotate, thereby driving the valve needle 300 to move, so as to adjust the degree of connectivity between the inlet 230 and the outlet 240 in the second chamber 210, that is, to adjust the opening of the electronic expansion valve 1000, so as to adjust the medium flowing out of the second chamber 210 from the outlet 240, thereby achieving a throttling effect on the medium.

[0037] The second chamber 210 and the first chamber 201 are connected in a region. While medium flowing into the second chamber 210 through the inlet 230 may flow into the first chamber 201, the first chamber 201 is sealed by the pole claw assembly 21, the partition 22, and the valve seat 200. Even if the medium does flow into the first chamber 201, it is unlikely to flow out of the first chamber 201 to the outside. This allows the medium flowing through the electronic expansion valve 1000 to flow more from the inlet 230 and out of the outlet 240, thereby improving the throttling performance of the electronic expansion valve 1000. Furthermore, the pole claw body 211 of the pole claw assembly 21 in the motor 100 is located within the partition 22, and the rotor assembly 10 is located within the pole claw body 211. This shortens the distance between the outer circumference of the rotor assembly 10 and the pole claw assembly 21, reducing the air gap of the motor 100 and improving the performance of the motor 100. This allows the motor 100 to be made smaller while maintaining the same power requirements, thus achieving miniaturization.

[0038] For example, in some specific embodiments, Figure 1-Figure 3As shown, the electronic expansion valve 1000 includes a motor 100, a valve seat 200, a valve needle 300, and a transmission member 400. The valve seat 200 defines a second chamber 210 that communicates with the first chamber 201. The valve seat 200 has a plurality of inlets 230 at its bottom. A valve port 220 is provided at its bottom, communicating with the second chamber 210. The valve port 220 has an outlet 240. Medium flows into the electronic expansion valve 1000 through the inlets 230 and flows out through the outlet 240. The transmission member 400 is fixed to the valve seat 200. The rotating shaft 11 of the rotor assembly 10 in the motor 100 is threadedly connected to the transmission member 400. The valve needle 300 is movably disposed within the valve seat 200. The upper end of the valve needle 300 is connected to the rotating shaft 11, and the lower end is located at the inlet 230 and the outlet 240. During the operation of the electronic expansion valve 1000, the rotor assembly 10 rotates to rotate the shaft 11, while the transmission member 400 is fixed, so that the shaft 11 rotates and moves in the up and down directions to drive the valve needle 300 to move in the up and down directions, thereby adjusting the degree of connectivity between the inlet 230 and the outlet 240, that is, adjusting the opening of the electronic expansion valve 1000.

[0039] In some embodiments of the present invention, Figure 3-Figure 6 As shown, the separator 22 comprises a sleeve 222 located radially outward of the pole claw body 211 and a cover 223 located on the axial side (F1) of the pole claw body 211. An annular hole extending circumferentially along the rotor assembly 10 between the sleeve 222 and the cover 223 serves as the connection hole 221. One end of the pole claw assembly 21 in the axial direction (F1) is sealed to the cover 223, while the other end in the axial direction (F1) is sealed to the electronic expansion valve 1000, such as the valve seat 200. For ease of understanding, the following explanation uses the example of the sealed connection between the other end of the pole claw assembly 21 in the axial direction (F1) and the valve seat 200. However, embodiments in which the other end of the pole claw assembly 21 in the axial direction (F1) is sealed to other parts of the electronic expansion valve 1000 are also possible.

[0040] The pole claw assembly 21 and the separator 22 define a first chamber 201. A connection portion 212 at one end of the pole claw assembly 21, located axially in F1, extends through a connection hole 221 between a sleeve 222 and a cover 223, sealingly connecting the sleeve 222 and the cover 223. This seals the connection and separates the first chamber 201 from its outer side at one end in the axial direction F1. The other end of the pole claw assembly 21, located axially in F1, is sealed to the valve seat 200. The sleeve 222 and pole claw assembly 21 separate the first chamber 201 from its radially outer side, such as the stator assembly 20. The pole claw assembly 21, separator 22, and valve seat 200 collectively seal the first chamber 201, improving the sealing performance of the first chamber 201 and enhancing the operational reliability of the motor 100.

[0041] In some specific embodiments, Figure 3As shown, one axial end F1 of the first chamber 201 is completely sealed, and the other axial end F1 of the first chamber 201 is sealed at the connection between the pole claw assembly 21 and the valve seat 200, and the other axial end F1 of the first chamber 201 is connected to the second chamber 210 defined by the valve seat 200.

[0042] In some embodiments, as Figure 3-Figure 6 As shown, the pole claw body 211 includes at least one pole claw group 2111 (eg Figure 3-Figure 6 The pole claw body 211 shown includes two pole claw groups 2111. Each pole claw group 2111 includes two pole claws 2112 arranged along the axial direction F1. Each pole claw 2112 includes multiple claw portions 2113 arranged along the circumferential direction and a yoke portion 2114 for connecting the multiple claw portions 2113. The connecting portion 212 is provided radially outwardly of the yoke portion 2114. The claw portions 2113 of the two pole claws 2112 in the same pole claw group 2111 are interlaced and plugged together to achieve magnetic connection between the rotor assembly 10, the pole claw group 2111, and the coil assembly 23, driving the rotor assembly 10 to rotate and thereby driving the valve needle 300 to move. For example Figure 3-Figure 6 As shown, the claw portions 2113 extend from the yoke portion 2114 toward the axial direction F1 , and the claw portions 2113 of the two pole claws 2112 of the same pole claw group 2111 extend in opposite directions for staggered insertion.

[0043] The sleeve 222 seals at least the gap between two adjacent pole claws 2112, preventing the medium in the first chamber 201 from flowing to the outside through the gap between the two adjacent pole claws 2112, thereby improving the sealing performance of the first chamber 201. The size of the sleeve 222 can also be reduced, for example, by eliminating the portion of the sleeve 222 that radially overlaps the pole claws 2112, thereby miniaturizing and reducing the weight of the motor 100.

[0044] In addition, if Figure 3-Figure 6 As shown, the claw 2113 is located on the inner side of the sleeve 222, so that water vapor outside the motor 100 is not easily invaded by the claw 2113, which can reduce the risk of damage such as corrosion to the claw 2113, and the performance of the pole claw assembly 21 is not easily damaged, which is beneficial to ensuring the performance of the motor 100.

[0045] In some related technologies, the pole claw is located between the stator assembly and the sleeve. To prevent external moisture from entering between the stator assembly and the sleeve and corroding the pole claw, a sealing ring is usually added between the stator assembly and the sleeve to separate the pole claw from the outside world, resulting in a bloated motor structure. In the present application, however, the claw portion 2113 is located inside the sleeve 222, making it difficult for external moisture to enter between the sleeve 222 and the coil assembly 23 and corrode the claw portion 2113. This eliminates the sealing ring used in the related technologies, simplifying the structure of the motor 100 and making the motor 100 more compact and smaller.

[0046] In the embodiment where the pole claw assembly 21 and the separator 22 are welded, the sealing connection effect between the pole claw assembly 21 and the separator 22 is better, and the claw portion 2113 is less likely to be corroded by external water vapor, which is beneficial to ensuring the performance of the motor 100.

[0047] In some embodiments, as Figure 3-Figure 6 As shown, the sleeve 222 extends continuously along the axial direction F1 of the rotor assembly 10, so that there are no through openings in the area where the sleeve 222 extends along the axial direction F1, which can more completely seal the gap between two adjacent pole claws 2112. For example, the sleeve 222 extends continuously along the axial direction F1 and the circumferential direction to seal the pole claws 2112 and the gap between two adjacent pole claws 2112, so that the medium in the first chamber 201 is less likely to flow to the outside, which is beneficial to improving the sealing performance of the first chamber 201.

[0048] In some embodiments of the present invention, Figure 3-Figure 8 As shown, the coil assembly 23 includes multiple coils 231 arranged along the axial direction F1. The pole claw groups 2111 correspond one-to-one to the coils 231. The adjacent yokes 2114 of two adjacent pole claw groups 2111 are connected as a whole, which improves the structural compactness of the multi-coil motor 100. The sleeves 222 correspond one-to-one to the pole claw groups 2111, separating the first chamber 201 from the outside world at the pole claw groups 2111. The annular holes extending circumferentially between adjacent sleeves 222 along the rotor assembly 10 serve as connecting holes 221. The connecting portions 212 are sealedly connected to the connecting holes 221, separating the first chamber 201 from the outside world between adjacent sleeves 222, i.e., at the yokes 2114. This improves the sealing effect of the first chamber 201 after the pole claw assembly 21 and sleeve 222 are integrated.

[0049] For example, in some specific embodiments, Figure 3-Figure 6 As shown, the coil assembly 23 includes two coils 231 arranged along the axial direction F1, two pole claw groups 2111 corresponding one-to-one with the two coils 231, and two sleeves 222 corresponding one-to-one with the two pole claw groups 2111. Connecting holes 221 are provided between the cover 223 and the sleeve 222, and between two adjacent sleeves 222. The pole claw assembly 21 includes three connecting portions 212, two of which are sealedly connected to the two connecting holes 221 in a one-to-one correspondence. The other connecting portion 212, located at the end of the pole claw assembly 21 near the valve seat 200 along the axial direction F1, is also sealedly connected to the sleeve 222 and the valve seat 200. The areas of the pole claw body 211 near the sleeve 222 and the cover 223 are also sealedly connected to the sleeve 222 and the cover 223. This improves the sealing effect of the first chamber 201 when the pole claw assembly 21, sleeve 222, and valve seat 200 are integrated.

[0050] In some embodiments, as Figure 3-Figure 6As shown, there are multiple connecting portions 212, and the coil assembly 23 further includes a magnetic frame 232 and a coil 231. The magnetic frame 232 includes multiple connecting and matching portions 2321 arranged along the axial direction F1. The multiple connecting and matching portions 2321 extend radially and are connected to the multiple connecting portions 212 in a one-to-one correspondence. The coil 231 is disposed between two adjacent connecting and matching portions 2321. The material of the magnetic frame 232 can be a magnetic conductive material.

[0051] By one-to-one connection between multiple connecting parts 212 and multiple connecting matching parts 2321 of the magnetic frame 232, a magnetic connection can be achieved between the pole claw assembly 21, the magnetic frame 232 and the coil 231 during the operation of the motor 100, thereby achieving a magnetic connection between the stator assembly 20 and the rotor assembly 10, which is beneficial for separating the first chamber 201 from the outside world while the stator assembly 20 and the rotor assembly 10 are magnetically connected, thereby ensuring the normal operation of the motor 100.

[0052] For example, in some specific embodiments, Figure 3-Figure 6 As shown, there are three connecting parts 212, and the magnetic conductive frame 232 includes a frame body 2322, an upper frame body 2323 and a lower frame body 2324 arranged and connected along the axial direction F1. The frame body 2322 is provided with a connecting fitting portion 2321. The radial inner ends of the upper frame body 2323 and the lower frame body 2324 are formed as connecting fitting portions 2321, so that the magnetic conductive frame 232 includes three connecting fitting portions 2321. The three connecting fitting portions 2321 are connected to the three connecting parts 212 in a one-to-one correspondence, and the connecting part 212 connected to the connecting fitting portion 2321 at the frame body 2322 is defined by the adjacent yoke portion 2114 that is connected as one of the two adjacent pole claw groups 2111 in the pole claw assembly 21, so that the rotor assembly 10, the upper pole claw group 2111, the magnetic conductive frame 232 and the upper coil 231 form a magnetic circuit (such as Figure 3 As shown in the schematic diagram of the elliptical line with arrows in the middle, the rotor assembly 10, the lower pole claw group 2111, the magnetic guide frame 232 and the lower coil 231 form a magnetic circuit (as shown in the schematic diagram of the elliptical line with arrows in the middle). Figure 3 As shown in the simplified diagram of the elliptical line with an arrow), the normal rotation of the rotor assembly 10 is ensured to drive the valve needle 300 to move.

[0053] In some embodiments of the present invention, Figures 1-8 As shown, motor 100 further includes a housing 30, which is injection-molded and surrounds coil assembly 23, thereby maintaining the sealing performance of coil assembly 23. A separator 22 is installed within housing 30 to separate first chamber 201 from coil assembly 23, reducing the risk of leakage of medium within first chamber 201 or even damage to coil assembly 23, thereby improving the operating safety of motor 100.

[0054] For example, in some embodiments, Figures 1-8As shown, the coil assembly 23 includes a magnetic frame 232 and a coil 231. The magnetic frame 232 and the coil 231 are wrapped by injection molding of the shell 30, so that the magnetic frame 232 and the coil 231 can be integrally encapsulated to maintain the sealing effect of the coil 231.

[0055] The pole claw assembly 21 and the separator 22 can be integrated into the coil assembly 23 to form a nested assembly. For example, the pole claw assembly 21 and the separator 22 can be directly inserted into the shell 30 that is injection-molded and wrapped with the coil assembly 23, and the pole claw assembly 21 and the coil assembly 23 are connected, which is easy to operate.

[0056] Other structures and operations of the motor 100 and the electronic expansion valve 1000 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0057] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0058] Throughout this specification, reference to terms such as "embodiment," "specific embodiment," and "example" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A motor, characterized in that: For an electronic expansion valve (1000), the motor (100) comprises: a rotor assembly (10), the rotor assembly (10) being connected to the valve needle (300) of the electronic expansion valve (1000) to drive the valve needle (300) to move; A stator assembly (20), the stator assembly (20) comprising a pole claw assembly (21), a separator (22) and a coil assembly (23), the pole claw assembly (21) comprising a connected pole claw body (211) and a connecting portion (212), the pole claw body (211) being located in the separator (22), the separator (22) being provided with a connecting hole (221), the connecting portion (212) being passed through the connecting hole (221) and being sealedly connected to the connecting hole (221), the connecting portion (212) being connected to the coil assembly (23), the pole claw assembly (21) and the separator (22) defining a first chamber (201), the rotor assembly (10) being located in the first chamber (201).

2. The motor according to claim 1, characterized in that The separator (22) comprises a sleeve (222) located radially outside the pole claw body (211) and a cover (223) located axially on one side of the pole claw body (211); an annular hole extending circumferentially of the rotor assembly (10) between the sleeve (222) and the cover (223) serves as the connecting hole (221); one axial end of the pole claw assembly (21) is sealedly connected to the cover (223), and the other axial end is sealedly connected to the valve seat (200) of the electronic expansion valve (1000).

3. The motor according to claim 2, characterized in that The pole claw body (211) includes at least one pole claw group (2111), the pole claw group (2111) includes two pole claws (2112) arranged along the axial direction, each pole claw (2112) includes a plurality of claw portions (2113) arranged along the circumferential direction and a yoke portion (2114) for connecting the plurality of claw portions (2113), the connecting portion (212) is provided on the radial outer side of the yoke portion (2114), the claw portions (2113) of the two pole claws (2112) of the same pole claw group (2111) are staggered and plugged, and the sleeve (222) at least seals the gap between two adjacent pole claws (2112).

4. The motor according to claim 3, characterized in that The sleeve (222) extends continuously along the axial direction of the rotor assembly (10).

5. The motor according to claim 3, characterized in that The coil assembly (23) includes a plurality of coils (231) arranged along the axial direction, the pole claw groups (2111) are a plurality corresponding one-to-one to the plurality of coils (231), adjacent yokes (2114) of two adjacent pole claw groups (2111) are connected as a whole, the sleeves (222) are a plurality corresponding one-to-one to the plurality of pole claw groups (2111), and an annular hole extending along the circumference of the rotor assembly (10) between adjacent sleeves (222) is the connecting hole (221).

6. The motor according to claim 3, characterized in that There are a plurality of connecting portions (212), and the coil assembly (23) further comprises a magnetic conductive frame (232) and a coil (231). The magnetic conductive frame (232) comprises a plurality of connecting and matching portions (2321) arranged along the axial direction. The plurality of connecting and matching portions (2321) extend radially and are connected to the plurality of connecting portions (212) in a one-to-one correspondence. The coil (231) is arranged between two adjacent connecting and matching portions (2321).

7. The motor according to claim 1, characterized in that It also includes a shell (30), which is an injection-molded body and injection-molded to wrap the coil assembly (23), and the separator (22) is installed in the shell (30).

8. The motor according to any one of claims 1 to 7, characterized in that The gap between the rotor assembly (10) and the pole claw assembly (21) is less than or equal to 0.3 mm.

9. An electronic expansion valve, characterized in that: The invention comprises an electric machine (100) according to any one of claims 1 to 8.

10. The electronic expansion valve according to claim 9, characterized in that: Also includes: A valve seat (200) and a valve needle (300), wherein the valve seat (200) is connected to the pole claw assembly (21) and defines a second chamber (210), wherein the second chamber (210) has an opening communicating with the outside for circulating a medium, and the valve needle (300) is located in the second chamber (210) and is connected to the rotating shaft (11) of the rotor assembly (10).

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