Stator assembly and electric device

Abstract

The stator assembly comprises a first pole plate and a second pole plate, the stator assembly comprises a first winding, and pole teeth of one first pole plate and pole teeth of one second pole plate are located on the inner side of the first winding; each substrate comprises a defect part, a reference surface is defined, the reference surface is perpendicular to the axial direction of the stator assembly, and orthographic projections of the defect part of the first polar plate and the defect part of the second polar plate on the reference surface coincide or basically coincide in the axial direction of the stator assembly; one contact pin connecting part is positioned on the radial outer side of the defect part of the first polar plate, and the other contact pin connecting part is positioned on the radial outer side of the defect part of the second polar plate. The orthographic projection of the defect part of the first polar plate and the orthographic projection of the defect part of the second polar plate on the reference plane coincide or basically coincide, so that the distance between the pin connecting part and the central axis of the substrate is smaller, and the radial size of the stator assembly is reduced.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology, and more particularly to a stator assembly and an electric actuator. Background Technology

[0002] Electric actuators can be applied in thermal management systems. In related technologies, electric actuators are driven by motors and include stator assemblies. If the size of the stator assembly is large, the overall size of the electric actuator will be large, which is not conducive to the miniaturization of the electric actuator. Summary of the Invention

[0003] One object of this application is to provide a stator assembly and electric actuator that can reduce the size of the drive assembly.

[0004] One technical solution of this application provides a stator assembly, including a first electrode plate and a second electrode plate, both the first electrode plate and the second electrode plate including a substrate and pole teeth; the stator assembly includes a first winding, and a pole tooth of the first electrode plate and a pole tooth of the second electrode plate are both located inside the first winding; each substrate includes a defect portion, defining a reference plane, the reference plane being perpendicular to the axial direction of the stator assembly, and along the axial direction of the stator assembly, the orthographic projections of the defect portions of the first electrode plate and the second electrode plate coincide or substantially coincide on the reference plane; the stator assembly includes a frame component, the frame component including at least two pin connection portions, one pin connection portion being located radially outside the defect portion of the first electrode plate, and the other pin connection portion being located radially outside the defect portion of the second electrode plate.

[0005] In the stator assembly provided by the technical solution of this application, one pin connection part is located radially outside the defective part of the first electrode plate, and the other pin connection part is located radially outside the defective part of the second electrode plate. The defective parts of the first electrode plate and the defective parts of the second electrode plate coincide or substantially coincide in the orthographic projection on the reference plane, thereby making the distance between the pin connection part and the central axis of the substrate smaller, and thus reducing the radial dimension of the stator assembly.

[0006] Another technical solution of this application provides a stator assembly, including a first pole plate and a second pole plate, both the first pole plate and the second pole plate including a substrate and pole teeth; the stator assembly includes a first winding, and a pole tooth of the first pole plate and a pole tooth of the second pole plate are both located inside the first winding; each substrate includes a defect portion, defining a reference plane, the reference plane being perpendicular to the axial direction of the stator assembly, and along the axial direction of the stator assembly, the orthographic projections of the defect portions of the first pole plate and the second pole plate coincide or substantially coincide on the reference plane; the stator assembly includes a circuit board assembly, a portion of the circuit board assembly being located radially outside the defect portion of the first pole plate, and a portion of the circuit board assembly being located radially outside the defect portion of the second pole plate.

[0007] In another technical solution of this application, the missing portions of the first electrode plate and the missing portions of the second electrode plate coincide or substantially coincide in the orthographic projection of the reference plane; a portion of the circuit board assembly is located radially outside the missing portion of the first electrode plate and a portion of the circuit board assembly is located radially outside the missing portion of the second electrode plate, thereby making the distance between the circuit board assembly and the central axis of the substrate smaller, and thus reducing the radial dimension of the stator assembly.

[0008] One technical solution of this application provides an electric device, which includes the aforementioned stator assembly, a rotor assembly, and a permanent magnet. A portion of the stator assembly surrounds the outer periphery of the permanent magnet. The electric device includes a valve core and a valve seat, the valve seat having a valve port. The rotor assembly can drive the valve core, causing the valve core to move relative to the valve seat, thereby closing or opening the valve port. Alternatively, the electric device includes an impeller, and the rotor assembly can drive the impeller.

[0009] In the electric device provided by the technical solution of this application, the pin connection part and the defect part are located on the same side. The defect parts of the first electrode plate and the defect parts of the second electrode plate coincide or substantially coincide on the orthographic projection of the reference plane, which can make the pin connection part and the defect part more matched, thereby making the distance between the pin connection part and the central axis of the substrate smaller, and thus reducing the radial dimension of the stator assembly. Attached Figure Description

[0010] Figure 1 A three-dimensional structural schematic diagram of one embodiment of the stator assembly is shown;

[0011] Figure 2 It shows Figure 1 The exploded structure diagram of the stator assembly shown;

[0012] Figure 3 It shows Figure 2 An exploded view of a portion of the stator assembly shown.

[0013] Figure 4 A schematic diagram of the stator assembly's frame components, pins, and electrode plates is shown.

[0014] Figure 5 A schematic diagram of the structure of the first electrode plate from one view is shown;

[0015] Figure 6 A schematic diagram of the second electrode plate from one viewpoint is shown;

[0016] Figure 7 A three-dimensional structural schematic diagram of a portion of the stator assembly is shown;

[0017] Figure 8 A schematic diagram of the three-dimensional structure after the first and second electrode plates are stacked is shown.

[0018] Figure 9 It shows Figure 7 A schematic diagram of a portion of the stator assembly at an angle is shown.

[0019] Figure 10 It shows Figure 9 A schematic cross-sectional view of a portion of the stator assembly along line AA;

[0020] Figure 11 A three-dimensional structural schematic diagram of one embodiment of the electric device of this application is shown.

[0021] Figure 12 It shows Figure 11 A schematic cross-sectional view of the electric actuator shown.

[0022] Figure 13 A cross-sectional schematic diagram of a portion of another embodiment of the stator assembly is shown;

[0023] Figure 14 The diagram shows an electrode plate, a frame component, and a pin, representing an undisclosed technical solution.

[0024] Figure 15 It shows Figure 14 A schematic diagram of the structure showing two plates at an angle;

[0025] Figure 16 It shows Figure 15 The diagram shows the structure of the two plates at another angle.

[0026] Figure Labels

[0027] 100. Electric actuator; 2. Stator assembly; 21. Housing; 211. Limiting hole; 22. Frame component; 221. Pin connector; 223. Outer surface; 224. Protrusion; 23. First electrode plate; 24. Second electrode plate; 25. Substrate; 251. Defect; 252. Outer peripheral surface; 26. Pole tooth; 253. Positioning part; 254. Anti-misalignment groove; 271. First winding; 272. Second winding; 3. Circuit board assembly; 31. Electronic component; 32. Bare board; 29. ​​Pin; 28. Housing; 5. Rotor assembly; 51. Permanent magnet; 6. Valve core; 7. Valve seat. Detailed Implementation

[0028] The embodiments are described in detail below with reference to the accompanying drawings.

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. In this document, relational terms such as "first" and "second" are used merely to distinguish one component from another with the same name, and do not necessarily require or imply any such actual relationship or order between these components. It should be noted that "limiting connection" in this application includes snap-fit, hinge, etc., and "fixed connection" includes threaded connection, welding, bonding, vulcanization fixing, riveting, insert injection molding, interference fit, etc.

[0030] like Figures 11-12 As shown, the electric device 100 includes a stator assembly 2 and a rotor assembly 5. The rotor assembly 5 includes a permanent magnet 51, which has at least two pairs of magnetic poles. A portion of the stator assembly 2 surrounds the outer periphery of the permanent magnet 51. The electric device 100 can be a valve. In this embodiment, the electric device 100 is an electronic expansion valve. The electric device 100 includes a valve core 6 and a valve seat 7. The valve seat 7 has a valve port. The rotor assembly 5 can drive the valve core 6, causing the valve core 6 to move relative to the valve seat 7, thereby closing or opening the valve port. Of course, in other embodiments, the electric device can include an electric ball valve, an electric water valve, an electric injector, etc., and the corresponding valve core 6 includes a valve needle, a ball core, a piston, etc. The electric device can also be a pump, which includes an impeller. The rotor assembly 5 can drive the impeller to rotate.

[0031] like Figures 1-7As shown, the stator assembly 2 includes at least two first electrode plates 23 and at least two second electrode plates 24; both the first electrode plate 23 and the second electrode plate 24 include a base plate 25 and pole teeth 26; the stator assembly 2 includes a first winding 271 and a second winding 272; the pole teeth 26 of one first electrode plate 23 and one second electrode plate 24 are located inside the first winding 271; the pole teeth 26 of the other first electrode plate 23 and the other second electrode plate 24 are located inside the second winding 272; along the axial direction of the stator assembly 2, the base plates 25 of the two second electrode plates 24 are adjacent, and the pole teeth 26 of one second electrode plate 24 and the pole teeth 26 of the other second electrode plate 24 extend in opposite directions. The axial direction of the stator assembly 2 is... Figure 7 In the figure, H represents the axial direction of the stator assembly 2, which is parallel to the extension direction of the central axis C of the substrate.

[0032] like Figures 5-10 As shown, each substrate 25 includes a defect 251, defining a reference plane that is perpendicular to the axial direction of the stator assembly 2. An example of the reference plane is shown in... Figure 8 As shown in S1, along the axial direction of the stator assembly 2, the deficient portions 251 of the first electrode plate 23 and the deficient portions 251 of the second electrode plate 24 coincide or substantially coincide in orthographic projection on the reference plane. The stator assembly 2 includes a frame member 22, which includes at least two pin connectors 221. Along the radial direction of the stator assembly 2, one pin connector 221 is located radially outside the deficient portion 251 of the first electrode plate 23, and the other pin connector 221 is located radially outside the deficient portion 251 of the second electrode plate 24, such that the two pin connectors 221 are at least separated by a winding distance. The two pin connectors 221 and the defect 251 are located on the same side of the stator assembly 2. The defect 251 of the first electrode plate 23 and the defect 251 of the second electrode plate 24 coincide or substantially coincide in their orthographic projections on the reference plane. This allows the pin connectors 221 and the defect 251 to be better matched, thereby reducing the distance between the pin connectors 221 and the central axis C of the substrate 25, and consequently reducing the radial dimension of the stator assembly 2. It should be noted that "substantially coincident" means that the deviation between their projections is less than 1 mm.

[0033] In comparison, Figure 14 , Figure 15 , Figure 16 This illustrates an undisclosed technical solution, including an electrode plate and a frame component 22'. Figures 14-16 There are two mating electrode plates 23' and 24', both of which have a defect 251', but the two defective portions 251' are not aligned, that is, in Figure 16 From the perspective of the two defective parts 251', they are offset by a certain angle, which makes the pin connection part 221' located outside the defective part 251' further away from the central axis C' of the electrode plate.

[0034] Along the axial direction of the stator assembly 2, the orthographic projections of the two pin connection portions 221 on the reference plane coincide or substantially coincide, facilitating electrical connection between the two pin connection portions 221 and the same circuit board assembly 3. Since the orthographic projections of the deficient portion 251 of the first electrode plate 23 and the deficient portion 251 of the second electrode plate 24 coincide or substantially coincide on the reference plane, the two pin connection portions 221 can be better matched with the deficient portion 251, thereby allowing the two pin connection portions 221 to be closer to the central axis C of the substrate 25, and thus reducing the radial dimension of the stator assembly 2.

[0035] The stator assembly 2 includes a circuit board assembly 3. Part of the circuit board assembly 3 is located radially outside the defect portion 251 of the first electrode plate 23, and part of the circuit board assembly 3 is located radially outside the defect portion 251 of the second electrode plate 24. Since the orthographic projections of the defect portions of the first electrode plate 23 and the second electrode plate 24 on the reference plane coincide or substantially coincide, the distance between the circuit board assembly 3 and the central axis C of the substrate is smaller, thereby reducing the radial dimension of the stator assembly 2.

[0036] The stator assembly 2 includes pins 29, at least two of which are fixedly connected to a pin connection portion 221. One pin 29 is electrically connected to one end of a winding, and the other pin 29 is electrically connected to the other end of the winding. The pins 29 are electrically connected to and fixedly connected to a circuit board assembly 3, which is located radially outward of the stator assembly 2. Along the radial direction of the stator assembly 2, the circuit board assembly 3 and the defect portion 251 are located on the same side. The extension direction of the bare board 32 of the circuit board assembly 3 is parallel or substantially parallel to the axial direction of the stator assembly 2, further reducing the radial dimension of the stator assembly 2 and making its structure more compact. Specifically, the defect portion 251 is planar, and the extension direction of the circuit board assembly 3 is parallel or substantially parallel to the extension direction of the defect portion 251.

[0037] like Figures 5-10As shown, the pin connection portion 221 includes an outer surface portion 223 and two protrusions 224. The outer surface portion 223 faces the circuit board assembly 3, and a portion of the pins 29 are inserted into the protrusions 224. Along the circumference of the stator assembly 2, the two protrusions 224 are located on both sides of the outer surface portion 223, and a portion of the electronic components 31 included in the circuit board assembly 3 are located between the two protrusions 224, making the structure of the stator assembly 2 more compact. Specifically, at least a portion of the outer surface portion 223 is located radially outside the deficient portion 251. The deficient portion 251 is planar, and the outer surface portion 223 is parallel or substantially parallel to the deficient portion 251, so that the distance between the outer surface portion 223 and the deficient portion 251 can be smaller, thereby leaving more space to accommodate the electronic components 31 of the circuit board assembly 3, thereby reducing the radial dimension of the stator assembly 2. The electronic components 31 can be capacitors, inductors, or other electronic components known to those skilled in the art. In other technical solutions, the defect 251 may not be planar; it may be arc-shaped. In short, the defect 251 needs to form a "defect" relative to the outer peripheral surface 252 of the arc-shaped substrate 25. The distance between the center of the defect 251 and the central axis of the stator assembly 2 is less than the distance between the outer peripheral surface 252 and the central axis C of the stator assembly 2.

[0038] In some implementations, such as Figure 13 As shown, the pin 29 is located radially outside the defect portion 251. Since the defect portions 251 of the first electrode plate 23 and the defect portions 251 of the second electrode plate 24 coincide or substantially coincide in the orthographic projection of the reference plane S1, that is, the defect portions 251 of the first electrode plate 23 and the defect portions 251 of the second electrode plate 24 are aligned, the distance between the pin 29 and the central axis C of the substrate 25 can be reduced, thereby reducing the radial dimension of the stator assembly 2.

[0039] like Figure 5 , Figure 6 As shown, the two first electrode plates 23 have identical structures, and the two second electrode plates 24 have identical structures, which reduces the types of parts and facilitates manufacturing. The central axis of the electrode plate substrate 25 is defined as the C-axis. Since the electrode plates are not perfectly symmetrical, and the substrate 25 is not perfectly symmetrical, the central axis here is only defined relative to the outline of the outer peripheral surface 252 of the electrode plate, and is for illustrative purposes. The center in this text is also defined this way; the axial direction of the stator assembly 2 is parallel to the C-axis. Figure 5Taking the first electrode plate 23 as an example, the center M of the defect 251 is defined, the center N of the electrode tooth 26 is defined, and the line connecting the center of the defect 251 and the central axis of the substrate 25 is defined as the first reference line MC; the line connecting the center of the electrode tooth 26 and the central axis of the substrate 25 is defined as the second reference line NC. The first electrode plate 23 and the second electrode plate 24 have the same number of electrode teeth 26. Each electrode tooth 26 has another symmetrical electrode tooth 26 with the central axis C of the substrate 25 as a reference. The electrode teeth 26 in an electrode plate are evenly distributed along the circumference of the electrode plate.

[0040] The number of pole teeth 26 of the first pole plate 23 is defined as n, and the number of windings is defined as m. The angle a1 between the first reference line MC of the first pole plate 23 and the second reference line NC closest to the first reference line MC is 360° / (2*n*m); the angle a2 between the first reference line MC of the second pole plate 24 and the second reference line NC closest to the first reference line MC is 360° / (4*n*m). By using the above-mentioned first substrate 25 and second substrate 25, the pole teeth 26 of two adjacent second substrates 25 are staggered by an angle of 360° / (2*n*m), thereby making the pole teeth 26 corresponding to two adjacent windings staggered by an angle, which can reduce the step angle of the rotor assembly 5. At the same time, it can realize that the orthographic projection of the deficient parts 251 of the first substrate 25 and the second substrate 25 on the reference plane coincides, or in other words, the deficient parts 251 of the first substrate 25 and the second substrate 25 are aligned. In this embodiment, the stator assembly 2 has only two-phase windings. In other embodiments, the stator assembly 2 may have three-phase windings and six pole plates.

[0041] like Figure 5 , Figure 6 , Figure 8 As shown, each substrate 25 has a positioning part 253 on its outer periphery. All positioning parts 253 are the same size. Since the stator assembly 2 is manufactured using an integral injection molding process, the frame component 22 is formed in one injection molding process using two first electrode plates 23 and two second electrode plates 24 as inserts. Therefore, the relative positions of the four electrode plates need to be determined using the positioning parts 253 before injection molding. Along the axial direction of the stator assembly 2, the orthographic projections of each positioning part 253 on the reference plane coincide or substantially coincide. Compared to technical solutions where the positioning parts 253 are not aligned, the positioning structure of the injection mold corresponding to the solution in this application is simpler, thereby improving the efficiency of placing the electrode plates during injection molding and thus increasing production efficiency.

[0042] The substrate 25 includes an outer peripheral surface 252, which is arc-shaped. A positioning portion 253 protrudes radially from the outer peripheral surface 252, and at least a portion of the positioning portion 253 protrudes from the surface of the frame member 22. In other embodiments, the positioning portion 253 may also be groove-shaped.

[0043] like Figures 3-7As shown, the stator assembly 2 includes a housing 21, which is made of metal. At least a portion of the housing 21 is located outside the outer periphery 252 of the substrate 25. The housing 21 has a limiting hole 211, which corresponds to a positioning part 253. At least a portion of the positioning part 253 is located in the limiting hole 211 and engages with the wall forming the positioning hole. Through the engagement of the limiting hole 211 and the positioning part 253, the relative position of the housing 21 and the electrode plate is determined. That is, the protruding positioning part 253 can also play a role in positioning the housing 21, and facilitates the subsequent welding of the housing 21 to the first electrode plate 23 and the second electrode plate 24.

[0044] like Figure 6 , Figure 8 As shown, in some technical solutions, the outer periphery of the substrate 25 of the second electrode plate 24 is provided with an anti-misalignment groove 254, while the first electrode plate 23 does not have a similar groove structure. This increases the visual difference between the second electrode plate 24 and the first electrode plate 23, preventing the electrodes from being placed in the wrong order when placed into the injection mold. The number of anti-misalignment grooves 254 can be one; or, the number of anti-misalignment grooves 254 can be greater than or equal to two, and each anti-misalignment groove 254 is the same size and symmetrically distributed with respect to the first reference line MC.

[0045] like Figure 12 As shown, the stator assembly 2 includes a housing 28, which covers the first winding, the second winding, the first pole plate 23, and the second pole plate 24.

[0046] The electric device 100 provided in this application is particularly suitable for the vehicle field because the stator assembly 2 provided in this application is small in size, while a more compact arrangement is required in the vehicle.

[0047] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described 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 the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A stator assembly, comprising a first pole plate (23) and a second pole plate (24), wherein both the first pole plate (23) and the second pole plate (24) include a base plate (25) and pole teeth (26); the stator assembly (2) includes a first winding (271), wherein a pole tooth (26) of the first pole plate (23) and a pole tooth (26) of the second pole plate (24) are located inside the first winding (271); each of the base plates (25) includes a notch (251) defining a reference plane, the reference plane being perpendicular to the axial direction of the stator assembly (2) and extending along the stator... In the axial direction of the assembly (2), the deficient portion (251) of the first electrode plate (23) and the deficient portion (251) of the second electrode plate (24) coincide or substantially coincide in the orthographic projection of the reference plane; the stator assembly (2) includes a skeleton component (22), the skeleton component (22) includes at least two pin connection portions (221), one of the pin connection portions (221) is located radially outside the deficient portion (251) of the first electrode plate (23), and the other pin connection portion (221) is located radially outside the deficient portion (251) of the second electrode plate (24).

2. The stator assembly according to claim 1, characterized in that, Along the axial direction of the stator assembly (2), the two pin connectors (221) coincide or substantially coincide in orthographic projection on the reference plane.

3. The stator assembly according to claim 1 or 2, characterized in that, The stator assembly (2) includes pins (29), at least two of the pins (29) are fixedly connected to the pin connection portion (221), one of the pins (29) is electrically connected to one end of the winding, and the other pin (29) is electrically connected to the other end of the winding; the stator assembly (2) includes a circuit board assembly (3), the pins (29) are electrically connected to and fixedly connected to the circuit board assembly (3), the circuit board assembly (3) is located on the radial outer side of the stator assembly (2), along the radial direction of the stator assembly (2), the circuit board assembly (3) and the defect portion (251) are located on the same side, and the extension direction of the bare board of the circuit board assembly (3) is parallel or substantially parallel to the axial direction of the stator assembly (2).

4. The stator assembly according to claim 3, characterized in that, The pin connection portion (221) includes an outer face portion (223) and two protrusions (224). The outer face portion (223) faces the circuit board assembly (3), and a portion of the pins (29) are inserted into the protrusions (224). Along the circumference of the stator assembly (2), the two protrusions (224) are located on both sides of the outer face portion (223). A portion of the electronic components (31) included in the circuit board assembly (3) are located between the two protrusions (224). The defect portion (251) is planar. The outer face portion (223) is parallel or substantially parallel to the defect portion (251), and at least a portion of the outer face portion (223) is located radially outside the defect portion (251).

5. The stator assembly according to claim 1 or 2, characterized in that, The stator assembly (2) includes a pin (29) fixed to the pin connection portion (221) and the pin (29) is located radially outside the defect portion (251).

6. A stator assembly, comprising a first pole plate (23) and a second pole plate (24), each of the first pole plate (23) and the second pole plate (24) comprising a base plate (25) and pole teeth (26); the stator assembly (2) comprising a first winding (271), wherein a pole tooth (26) of the first pole plate (23) and a pole tooth (26) of the second pole plate (24) are both located inside the first winding (271); each of the base plates (25) comprises a notch (251) defining a reference plane, the reference plane being perpendicular to... Along the axial direction of the stator assembly (2), the deficient portion (251) of the first electrode plate (23) and the deficient portion (251) of the second electrode plate (24) coincide or substantially coincide in orthographic projection on the reference plane; the stator assembly (2) includes a circuit board assembly (3), a portion of the circuit board assembly (3) is located radially outside the deficient portion (251) of the first electrode plate (23), and a portion of the circuit board assembly (3) is located radially outside the deficient portion (251) of the second electrode plate (24).

7. The stator assembly according to any one of claims 1-6, characterized in that, The stator assembly (2) includes at least two first pole plates (23) and at least two second pole plates (24). The stator assembly (2) includes a second winding (272). The pole teeth (26) of one first pole plate (23) and one second pole plate (24) are located inside the second winding (272). The two first pole plates (23) have the same structure, and the two second pole plates (24) have the same structure. The number of pole teeth (26) of the first pole plates (23) and the second pole plates (24) is the same. Along the axial direction of the stator assembly (2), the base plates (25) of the two second pole plates (24) are adjacent. The pole teeth (26) of one second pole plate (24) are adjacent to the pole teeth (26) of the other second pole plate (24). The pole teeth (26) extend in opposite directions; the line connecting the center of the defect (251) and the central axis of the substrate (25) is defined as the first reference line (MC), and the line connecting the center of the pole teeth (26) and the central axis of the substrate (25) is defined as the second reference line (NC); the number of pole teeth (26) of the first electrode plate (23) is defined as n, the number of windings is defined as m, the angle between the first reference line (MC) of the first electrode plate (23) and the second reference line (NC) closest to the first reference line (MC) is 360° / (2*n*m), and the angle between the first reference line (MC) of the second electrode plate (24) and the second reference line (NC) closest to the first reference line (MC) is 360° / (4*n*m).

8. The stator assembly according to claim 7, characterized in that, Each of the substrates (25) has a positioning part (253) on its outer periphery; each positioning part (253) is the same size and along the axial direction of the stator assembly (2), each positioning part (253) coincides or substantially coincides with the orthographic projection of the reference plane. The stator assembly (2) includes a skeleton component (22), which is injection molded with the first electrode plate (23) and the second electrode plate (24) as inserts.

9. The stator assembly according to claim 8, characterized in that, Each of the substrates (25) includes at least two positioning portions (253), and each positioning portion (253) is symmetrically distributed with respect to the first reference line.

10. The stator assembly according to claim 8 or 9, characterized in that, The substrate (25) includes an outer peripheral surface (252) which is arc-shaped. The positioning part (253) protrudes radially from the outer peripheral surface (252) of the stator assembly (2), and at least a portion of the positioning part (253) protrudes from the surface of the skeleton member (22). The stator assembly (2) includes a housing (21), at least a portion of which is located outside the outer peripheral surface (252) of the substrate (25). The housing (21) has a limiting hole (211) which corresponds to the positioning part (253). At least a portion of the positioning part (253) is located in the limiting hole (211) and engages with the wall forming the positioning hole.

11. The stator assembly according to any one of claims 7-10, characterized in that, The outer periphery of the substrate (25) of the second electrode plate is provided with an anti-error groove (254), and the number of the anti-error groove (254) is one; or, the number of the anti-error groove (254) is greater than or equal to two, and each of the anti-error grooves (254) is the same size and is symmetrically distributed with the first reference line as the reference.

12. An electric actuator comprising a stator assembly (2) according to any one of claims 1-11; the electric actuator comprising a rotor assembly (5) including a permanent magnet (51), a portion of the stator assembly (2) surrounding the permanent magnet (51); the electric actuator comprising a valve core (3) and a valve seat having a valve port, the rotor assembly (5) being capable of driving the valve core (3) such that the valve core (3) moves relative to the valve seat, thereby closing or opening the valve port; or, the electric actuator comprising an impeller, the rotor assembly (5) being capable of driving the impeller.

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