Electronic valve

Abstract

The invention provides an electronic valve. The electronic valve comprises a valve body, a valve element, a stator assembly, a rotor assembly, a circuit board and a magnetic sensor, the valve body is provided with a valve port, the valve element is matched with the valve port, the rotor assembly is in driving connection with the valve element, the stator assembly comprises a magnet exciting coil, and the axis of the rotor assembly is collinear with the axis of the magnet exciting coil; the magnetic sensor senses magnetic field changes of the rotor assembly and generates induction signals, a magnetic induction face of the magnetic sensor is provided with a point A, a circle B is drawn with the distance R1 from the point A to the axis of the rotor assembly as the radius, the circle center of the circle B is a point C located on the axis of the rotor assembly, and the magnetic field intensity of the magnet exciting coil passing through the point A can be decomposed into multiple vectors. Wherein one vector is B1, the direction of B1 is H2, and the direction H2 is the tangential direction of the circle B at the point A; and an included angle of 0-45 degrees is formed between the magnetic induction direction of the magnetic sensor and the tangential direction of the circle B at the point A.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid control devices, in particular to an electronic valve. BACKGROUND

[0002] The motor structure applied to the electronic valve includes a stator assembly and a rotor assembly, and the running condition of the rotor assembly can be determined by sensing the change of the magnetic pole of the rotor assembly with a magnetic sensor. However, the coil of the stator assembly inevitably leaks magnetic field during excitation (the leakage magnetic field is the magnetic field generated by the coil to interfere with the signal of the magnetic sensor), and the magnetic sensor will sense the change of the leakage magnetic field of the coil and generate an induced signal, that is, the leakage magnetic field of the coil affects the determination of the activity of the rotor assembly, and thus the magnetic sensor cannot accurately determine the activity of the rotor assembly. SUMMARY

[0003] In view of this, the present application provides an electronic valve, which aims to avoid the influence of the leakage magnetic field of the coil on the magnetic sensor, so as to enable the magnetic sensor to accurately determine the activity of the rotor assembly.

[0004] The electronic valve of the present application includes a valve body, a valve core, a stator assembly, a rotor assembly, and an electrically connected circuit board and a magnetic sensor; the valve body has a valve port, the valve core cooperates with the valve port, the rotor assembly is drivingly connected to the valve core, the stator assembly includes an excitation coil, and the axis of the rotor assembly is collinear with the axis of the excitation coil.

[0005] The magnetic sensor senses the change of the magnetic field of the rotor assembly and generates an induced signal, the magnetic sensing surface of the magnetic sensor has a point A, a circle B is made with the distance R1 from the point A to the axis of the rotor assembly as the radius, the center of the circle B is a point C located on the axis of the rotor assembly, the magnetic field intensity of the excitation coil passing through the point A can be decomposed into a plurality of vectors, one of which is B1, the direction of B1 is H2, and the direction H2 is the tangent direction of the circle B at the point A; the magnetic sensing direction of the magnetic sensor forms an included angle of 0°-45° with the tangent direction of the circle B at the point A.

[0006] In some embodiments, the decomposed vectors of the magnetic field intensity of the excitation coil passing through the point A further include B2, the value of B2 is higher than that of B1, the direction of B2 is H1, H1 is the direction of the line connecting the point A and the point C, and the magnetic sensing direction of the magnetic sensor forms an included angle of 45°-135° with H1.

[0007] In some embodiments, the included angle between the magnetic sensing direction of the magnetic sensor and H2 is 0°, and the included angle between the magnetic sensing direction of the magnetic sensor and H1 is 90°.

[0008] In some embodiments, the magnetic field strength of the rotor assembly passing through point A can be decomposed into multiple vectors, one of which is B3, the direction of B3 is H4, H4 is the tangent direction of circle B at point A, and the value of B3 is higher than the value of B1.

[0009] In some embodiments, the magnetic sensor has a magnetic field sensing area inside, and the magnetic sensitive surface includes a first magnetic sensitive surface and a second magnetic sensitive surface formed on opposite sides of the magnetic field sensing area and arranged in parallel, and the line connecting the first magnetic sensitive surface and the second magnetic sensitive surface is parallel to H2.

[0010] In some embodiments, the first magnetic sensitive surface and the second magnetic sensitive surface are both perpendicular to the circuit board.

[0011] In some embodiments, the circuit board has a through hole for the rotor assembly to pass through along the axial direction, and the through hole, the rotor assembly and the excitation coil are coaxial; a circle is drawn with point C as the center and a radius R2 smaller than R1 to obtain a circle D, and the radius R2 is the shortest distance from point C located on the axis of the rotor assembly to the edge of the through hole; the magnetic sensor is arranged on the outer peripheral side of the circle D.

[0012] In some embodiments, the stator assembly further includes a shell, the shell including a first mounting cavity and a second mounting cavity isolated from each other, at least part of the circuit board is located in the first mounting cavity, the rotor assembly is located in the second mounting cavity, the first mounting cavity and the excitation coil are arranged along the axial direction of the excitation coil, and the circuit board is perpendicular to the axis of the excitation coil.

[0013] In some embodiments, the stator assembly further includes a shell, the shell including a first mounting cavity and a second mounting cavity isolated from each other, at least part of the circuit board is located in the first mounting cavity, the rotor assembly is located in the second mounting cavity, and the first mounting cavity and the second mounting cavity are arranged along the radial direction of the excitation coil.

[0014] In some embodiments, the circuit board located in the first mounting cavity includes a first circuit board and a second circuit board that are electrically connected, the magnetic sensor is located on the first circuit board, the first circuit board is perpendicular to the axis of the excitation coil, and the second circuit board is parallel to the axis of the excitation coil.

[0015] In some embodiments, the circuit board is arranged on the outer peripheral side of the rotor assembly, and the circuit board and the excitation coil are arranged axially along the rotor assembly; and / or the magnetic sensor is a magnetoresistive sensor, and the magnetoresistive sensor has pins, and the pins are attached to the circuit board.

[0016] In some embodiments, the magnetic sensor is disposed on a side of the circuit board close to the excitation coil, and electrical components are arranged on a side of the circuit board facing away from the excitation coil.

[0017] In some embodiments, the electronic valve further includes a shielding frame fixedly connected to the circuit board, and at least a portion of the shielding frame is located on a side of the magnetic sensor relatively close to the excitation coil and covers the magnetic sensor.

[0018] In some embodiments, the shielding frame includes a cover plate, the cover plate is spaced apart from the circuit board to accommodate the magnetic sensor, and an edge of the magnetic sensor does not protrude beyond an edge of the cover plate.

[0019] In some embodiments, the shielding frame also includes a flange bent and connected to the cover plate, and the flange includes a board edge that forms a surface fit with the circuit board, and the board edge is welded and fixed to the circuit board; or, the board edge is adhesively fixed to the circuit board; or, the board edge is plugged and fixed to the circuit board.

[0020] In some embodiments, the shielding frame is an arc-shaped bent plate, at least one end of the shielding frame is fixedly connected to the circuit board, and a gap is provided between the shielding frame and the circuit board to accommodate the magnetic sensor.

[0021] In some embodiments, the circuit board has a clearance opening for the rotor assembly to extend through, and the shielding frame does not protrude beyond the outer periphery of the circuit board and does not protrude beyond the edge of the clearance opening; and / or,

[0022] The side of the circuit board relatively close to the excitation coil includes a magnetic isolation surface area and a magnetic receiving surface area, and the area where the projection area of ​​the shielding frame on the side of the circuit board relatively close to the excitation coil is located is the magnetic isolation surface area;

[0023] The area of ​​the circuit board that is relatively close to the excitation coil and outside the magnetic isolation surface area is the magnetic receiving surface area, and the magnetic working element is provided on the magnetic receiving surface area.

[0024] The beneficial effects of the electronic valve of the present invention are:

[0025] The vector of the magnetic field generated by the excitation coil in the H2 direction has a relatively weak intensity. The magnetic sensing direction of the magnetic sensor and the tangent direction of circle B at point A form an angle of 0°~45°, so that the vector of the magnetic field generated by the excitation coil in the H2 direction is closer to the magnetic sensing direction of the magnetic sensor, thereby preventing the magnetic sensor from being affected by other excitation coil magnetic field vectors with higher intensity and different from the H2 direction, weakening the influence of the leakage magnetic field of the excitation coil on the magnetic sensor, and the magnetic sensor is not easily excited by the leakage magnetic field of the excitation coil to generate an induction signal, thereby preventing the magnetic sensor of the electronic valve from misjudging the activity of the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a motor structure of an electronic valve according to an embodiment of the present invention from a top view;

[0027] Figure 2 A schematic diagram of a magnetic sensor of a motor structure of an electronic valve according to an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Schematic diagram of the internal structure of the magnetic sensor shown;

[0029] Figure 4 for Figure 3 The cross-sectional view of the magnetic sensor shown is taken along the FF plane;

[0030] Figure 5 is a cross-sectional view of an electronic valve according to an embodiment of the present invention;

[0031] Figure 6 This is a first schematic diagram of a partial structure of an electronic valve according to an embodiment of the present invention;

[0032] Figure 7 A second schematic diagram of a partial structure of an electronic valve according to an embodiment of the present invention;

[0033] Figure 8 is a schematic top view of the magnetic sensor of the electronic valve in a first preset sensing state;

[0034] Figure 9 is a schematic top view of the magnetic sensor of the electronic valve in a second preset sensing state;

[0035] Figure 10 is a schematic top view of the magnetic sensor of the electronic valve in a third preset sensing state;

[0036] Figure 11 A schematic diagram of a motor structure of an electronic valve according to another embodiment of the present invention;

[0037] Figure 12 for Figure 11Schematic diagram of the internal structure of the magnetic sensor of the motor structure shown;

[0038] Figure 13 1 is a diagram showing simulation results of the magnetic field of the induction coil of the magnetic sensor using a non-preset induction position arrangement when the coil is passed through a first test current;

[0039] Figure 14 A diagram showing simulation results of the magnetic field of the induction coil of the magnetic sensor arranged in the first preset induction state when the coil is passed through a first test current;

[0040] Figure 15 1. A diagram showing simulation results of the magnetic field of the induction coil of the magnetic sensor, which is arranged in a non-preset induction position and covered by a shielding frame, when the coil is passed through a first test current;

[0041] Figure 16 A diagram showing simulation results of the magnetic field of the induction coil of the magnetic sensor, which is arranged in a first preset induction position and covered by a shielding frame, when the coil is passed through a first test current;

[0042] Figure 17 The figure is a simulation result diagram of the external magnetic field sensed by the magnetic sensor using a non-preset sensing position arrangement when the rotor assembly is stationary;

[0043] Figure 18 1 is a simulation result diagram of the magnetic sensor sensing the external magnetic field when the rotor assembly is stationary and arranged in the first preset sensing position;

[0044] Figure 19 This is a simulation result diagram of the magnetic sensor sensing the external magnetic field when the rotor assembly is stationary and the magnetic sensor is arranged in a non-preset sensing position and covered by a shielding frame;

[0045] Figure 20 Graph showing simulation results of a magnetic sensor sensing an external magnetic field when the rotor assembly is stationary and arranged in a first preset sensing position and covered by a shielding frame;

[0046] Figure 21 The figure is a simulation result diagram of the external magnetic field sensed by the magnetic sensor arranged in a non-preset sensing position when the rotor assembly is in normal operation;

[0047] Figure 22 A diagram showing simulation results of the magnetic sensor sensing the external magnetic field when the rotor assembly is in normal operation and arranged in the first preset sensing position;

[0048] Figure 23 This is a simulation result diagram of the magnetic sensor sensing the external magnetic field when the rotor assembly is in normal operation and the magnetic sensor is arranged in a non-preset sensing position and covered by a shielding frame;

[0049] Figure 24A diagram showing simulation results of a magnetic sensor sensing an external magnetic field when the rotor assembly is in normal operation and the magnetic sensor is arranged in a first preset sensing position and covered by a shielding frame;

[0050] Figure 25 1 is a diagram showing simulation results of the magnetic field of the induction coil of the magnetic sensor using a non-preset induction position arrangement when the coil is passed through a second test current;

[0051] Figure 26 is a diagram showing simulation results of the magnetic field of the induction coil of the magnetic sensor arranged in the first preset induction state when the coil is passed through a second test current;

[0052] Figure 27 Graph showing simulation results of the magnetic sensor sensing the external magnetic field using a non-preset sensing position arrangement when the coil is energized by a second test current and the rotor assembly is stationary;

[0053] Figure 28 is a diagram showing simulation results of the magnetic sensor sensing the external magnetic field using the first preset sensing position arrangement when the coil is energized by the second test current and the rotor assembly is stationary;

[0054] Figure 29 1 is a diagram showing simulation results of the magnetic sensor sensing the external magnetic field using a non-preset sensing position arrangement when the coil is flowing with a second test current and the rotor assembly is operating normally;

[0055] Figure 30 is a diagram showing simulation results of the magnetic sensor sensing the external magnetic field using the first preset sensing position arrangement when the coil is flowing with the second test current and the rotor assembly is operating normally;

[0056] Figure 31 A schematic structural diagram of a motor structure of an electronic valve according to another embodiment of the present invention;

[0057] Figure 32 for Figure 31 The partial enlarged schematic diagram of the motor structure shown at point A;

[0058] Figure 33 An exploded schematic diagram of a motor structure of an electronic valve according to another embodiment of the present invention;

[0059] Figure 34 is a cross-sectional view of an electronic valve according to another embodiment of the present invention;

[0060] Figure 35 for Figure 34 A partial enlarged schematic diagram of the electronic valve at point B is shown.

[0061] 10, valve body; 11, valve port; 20, valve core; 30, rotor assembly; 40, magnetic sensor; 41, magnetic field induction area; 411, first magnetic induction surface; 412, second magnetic induction surface; 42, pin; 50, excitation coil; 60, circuit board; 61, through hole; 62, first side; 63, second side; 70, electrical element; 71, magnetic working element; 81, installation shell; 82, cover; 83, first installation cavity; 84, pedestal; 85, sleeve shell; 86, second installation cavity; 90, shielding frame; 91, cover plate; 92, flange; 921, support edge; 922, plate edge; 93, preset accommodation gap. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0064] The present application provides an electronic valve, the electronic valve comprising a motor structure, Figure 1 A schematic diagram of the motor structure of the electronic valve of an embodiment of the present application, Figure 5 A sectional view of the electronic valve of an embodiment of the present application, Figure 34 A sectional view of the electronic valve of another embodiment of the present application.

[0065] The motor structure comprises a stator assembly, a rotor assembly 30, an electrically connected circuit board 60 and a magnetic sensor 40, the stator assembly comprises a housing and an excitation coil 50, the excitation coil 50 is located in the housing and is sleeved on the outer circumferential side of the rotor assembly 30, the circuit board 60 and the magnetic sensor 40 are both located in the housing, and the axis of the rotor assembly 30 is collinear with the axis of the excitation coil 50.

[0066] Optionally, referring to Figure 5 and Figure 34The shell includes a first mounting cavity 83 and a second mounting cavity 86 isolated from each other. The magnetic sensor 40 and at least a portion of the circuit board 60 are located in the first mounting cavity 83, and the rotor assembly 30 is located in the second mounting cavity 86. The axes of the rotor assembly 30, the second mounting cavity 86 and the excitation coil 50 are collinear. The first mounting cavity 83 and the excitation coil 50 are arranged along the axis direction of the rotor assembly 30 and the excitation coil 50. The circuit board 60 in the first mounting cavity 83 is perpendicular to the axis of the excitation coil 50 and the rotor assembly 30.

[0067] The electronic valve includes a motor structure, a valve body 10, and a valve core 20 disposed on the valve body 10. The valve body 10 has a valve port 11 and a flow channel connected thereto. The valve core 20 cooperates with the valve port 11. The rotor assembly 30 drives and connects to the valve core 20. The magnetic sensor 40 and the circuit board 60 are disposed on the outer periphery of the rotor assembly 30. Optionally, the circuit board 60 and the excitation coil 50 are arranged sequentially along the axial direction of the rotor assembly 30.

[0068] The present invention does not limit the type of the circuit board 60 , and the circuit board 60 may be a PCB circuit board, a printed circuit board, or the like.

[0069] In other embodiments, the shell includes a first mounting cavity 83 and a second mounting cavity 86 that are isolated from each other, the magnetic sensor 40 and at least a portion of the circuit board 60 are located in the first mounting cavity 83, the rotor assembly 30 is located in the second mounting cavity 86, and the first mounting cavity 83 and the second mounting cavity 86 are arranged along the radial direction of the excitation coil 50.

[0070] Furthermore, the circuit board located in the first mounting cavity 83 includes a first circuit board and a second circuit board that are electrically connected. The magnetic sensor 40 is fixed to the first circuit board and electrically connected to the first circuit board. The first circuit board is perpendicular to the axis of the rotor assembly 30 and the excitation coil 50, and the second circuit board is parallel to the axis of the excitation coil 50. The first circuit board and the second circuit board can be electrically connected through a wire or a plug-in interface.

[0071] With this arrangement, the motor structure is more compact. By arranging the first circuit board and the second circuit board in different ways, the defects of using a larger circuit board resulting in a large motor structure and a large space occupied are overcome, and the electronic valve structure can be made compact.

[0072] The excitation coil 50 generates an induced magnetic field when energized. The rotor assembly 30 is a cylindrical structure made of magnetic material. Under the influence of the magnetic field of the excitation coil 50, the rotor assembly 30 moves axially and rotates around its axis. The valve core 20 is driven by the rotor assembly 30 to change the flow path within the valve body 10, thereby changing the flow path of the fluid. The magnetic sensor 40 senses changes in the magnetic field of the rotor assembly 30 and generates a sensing signal. The sensing signal is transmitted to the circuit board 60 and used as a basis for determining the movement of the rotor assembly 30.

[0073] For ease of description, the magnetic field of the rotor assembly 30 is referred to as the rotor magnetic field, the magnetic field after the excitation coil 50 is energized is referred to as the coil magnetic field, and the magnetic field when the excitation coil 50 leaks magnetic flux is referred to as the leakage magnetic field.

[0074] In some embodiments, the circuit board 60 has a clearance opening that allows the rotor assembly 30 to extend axially through the clearance opening while also preventing axial movement of the rotor assembly 30 to prevent interference between the rotor assembly 30 and the circuit board 60. In other embodiments, the circuit board 60 does not have a clearance opening and is spaced apart from the rotor assembly 30.

[0075] See Figure 1 、 Figures 5 to 7 The escape port is a through-hole 61 formed in the circuit board 60. Through-hole 61 penetrates the circuit board 60 on opposite sides of the rotor assembly 30 along the axial direction, and the rotor assembly 30 passes through through-hole 61. The shape of the escape port is not limited. In the embodiment shown in the drawings, through-hole 61 is a circumferentially closed hole in the inner wall. In other embodiments, the escape port may also be a notch formed by a concave edge of the circuit board 60.

[0076] See Figure 5 The shell includes a placement shell 81, a cover 82 and a sleeve shell 85. The placement shell 81 is an internal hollow thin-walled structure. An open first installation cavity 83 is formed inside the placement shell 81. The first installation cavity 83 is used to accommodate and install the magnetic sensor 40 and the circuit board 60. The opening of the first installation cavity 83 is covered by the cover 82. The sleeve shell 85 is connected to one end of the placement shell 81 relatively far away from the cover 82. The interior of the sleeve shell 85 is used to accommodate the excitation coil 50. In addition, the interior of the sleeve shell 85 also has a second installation cavity 86. A part of the second installation cavity 86 extends into the first installation cavity 83. The second installation cavity 86 can allow the rotor assembly 30 to move axially and rotate around the axis. The second installation cavity 86 extending into the first installation cavity 83 extends through the avoidance opening, and the excitation coil 50 surrounds the outer circumference of the rotor assembly 30 and the second installation cavity 86.

[0077] See Figures 5 to 7The rotor assembly 30 and the second mounting cavity 86 extending into the first mounting cavity 83 are arranged in the through hole 61. When the circuit board 60 is mounted in place in the first mounting cavity 83, the axis of the through hole 61 coincides with the axis of the rotor assembly 30, and the axis of the rotor assembly 30 is represented by a straight line H.

[0078] Optionally, referring to Figure 5 , the first mounting cavity 83 is provided with a bearing platform 84 for supporting and positioning the circuit board 60. The bottom wall of the first mounting cavity 83, i.e. the inner wall surface of the first mounting cavity 83 opposite to the cover 82, is elevated by the bearing platform 84 so as to be spaced apart from the bottom wall of the first mounting cavity 83. The other side of the bottom wall of the first mounting cavity 83 is the field coil 50, and the side of the circuit board 60 close to the field coil 50 can be arranged with the electrical element 70.

[0079] The magnetic sensor 40 itself has a certain magnetic sensing direction. Currently, the magnetic sensor is marked with a magnetic sensing direction. The closer the magnetic field direction is to the magnetic sensing direction, the easier the magnetic field is to be sensed by the magnetic sensor. In some embodiments, the magnetic sensor 40 has a magnetic field sensing area 41 inside, and the magnetic field sensing area 41 has a magnetic sensing surface for the magnetic induction lines to pass through. The closer the angle between the magnetic induction lines passing through the magnetic sensing surface and the magnetic sensing surface is to 90°, the easier the magnetic field is to be sensed by the magnetic sensor. As shown in Figure 2~Figure 3 , Figure 11-12 The magnetic field sensing area 41 is a cuboid area, and the magnetic sensing surface includes a first magnetic sensing surface 411 and a second magnetic sensing surface 412. The first magnetic sensing surface 411 and the second magnetic sensing surface 412 are respectively formed on the opposite sides of the magnetic field sensing area 41. The arrow V represents the magnetic sensing direction, which is the direction of the line connecting the first magnetic sensing surface 411 and the second magnetic sensing surface 412.

[0080] Optionally, as shown in Figures 2 to 4 , Figure 11-12 The first magnetic sensing surface 411 and the second magnetic sensing surface 412 are both planes and parallel to each other. The magnetic sensing direction is perpendicular to the first magnetic sensing surface 411 and the second magnetic sensing surface 412. The first magnetic sensing surface 411 and the second magnetic sensing surface 412 can be translated along the magnetic sensing direction.

[0081] Figures 2 to 4 The magnetic sensor 40 shown in Figure 11-12 is a plug-in magnetic sensor. The pin 42 of the plug-in magnetic sensor is inserted into the pad opening on the circuit board 60 to form an electrical connection between the plug-in magnetic sensor 40 and the circuit board 60.

[0082] In the prior art, the magnetic sensor is usually arranged so that the magnetic sensing direction is consistent with a certain radial direction of the rotor assembly. The magnetic field strength of the rotor magnetic field acting on any position of the magnetic sensing surface can be decomposed into two direction vectors, namely the rotor radial vector and the rotor tangential vector. The direction of the rotor radial vector is Figures 8 to 10 Indicated by arrow H3, the direction of the rotor tangential vector is Figures 8 to 10 In the prior art, a magnetic sensor senses the radial vector of the rotor and generates a sensing signal.

[0083] However, the excitation coil 50 on the outer peripheral side of the rotor assembly 30 will inevitably leak magnetic flux during the excitation process (leakage magnetic flux is the magnetic field generated by the coil that interferes with the magnetic sensor signal). Once the excitation coil 50 leaks magnetic flux, the magnetic sensor using the existing magnetic sensor arrangement will generate an induction signal under the interference of the leakage magnetic field. In this way, it is difficult to confirm the excitation source of the induction signal, and thus it is impossible to accurately determine whether the rotor assembly 30 is active and the actual activity status of the rotor assembly 30. For example, when the rotor assembly 30 is stuck and motionless, the leakage magnetic field of the excitation coil 50 will act on the magnetic sensor 40. At this time, the magnetic sensor 40 generates an induction signal and makes an erroneous judgment that the rotor assembly 30 is still active.

[0084] The magnetic sensor 40 of the motor structure of the present invention has a point A, which is specifically located within the magnetic sensing surface of the magnetic sensor 40. A circle B is drawn with the distance R1 from point A to the axis of the excitation coil 50 as the radius, and the center of circle B is point C located on the axis of the excitation coil 50. Figures 8 to 10 As shown, the magnetic field strength of the excitation coil 50 passing through point A can be decomposed into multiple vectors, one of which is B1, the direction of B1 is H2, the direction H2 is the tangent direction of circle B at point A, and the magnetic sensing direction of the magnetic sensor 40 forms an angle of 0°~45° with the tangent direction of circle B at point A.

[0085] See again Figures 8 to 10 The magnetic field strength of the excitation coil 50 passing through point A also includes vector B2. The strength of vector B2 is higher than that of vector B1. The direction of vector B2 is H1. Direction H1 is the direction of the line connecting point A and point C. That is, direction H1 and direction H2 are perpendicular. The magnetic sensing direction of the magnetic sensor 40 forms an angle of 45° to 135° with H1. Specifically, Figure 9 The magnetic sensor 40 shown in FIG. 1 forms a 45° angle between its magnetic sensing direction and H1. Figure 10 The magnetic sensor 40 shown forms an angle of 135° between its magnetic sensing direction and H1.

[0086] It can be understood that the magnetic field strength of the leakage magnetic field of the excitation coil 50 acting on any position of the magnetic sensing surface is decomposed into a plurality of vectors, including vector B1 and vector B2. The strength of vector B1 is extremely low, so the effect of vector B1 on the magnetic sensor 40 is extremely weak, and the magnetic sensor 40 will not generate an induced signal when the magnetic induction line of vector B1 passes through the magnetic sensing surface; the magnetic sensor 40 will be misjudged when vector B2 acts on the magnetic sensor 40.

[0087] Referring to Figures 8 to 10 , the magnetic field strength of the rotor assembly 30 passing through point A can be decomposed into a plurality of vectors, one of which is B3, and the direction of B3 is H4, and the other is B4, and the direction of B4 is H3. The direction H4 is the tangent direction of the circle B at point A, and the direction H3 is the connecting line direction of points A and C, that is, the direction H3 and the direction H4 are perpendicular.

[0088] The strength of vector B3 is higher than that of vector B1, and when the magnetic induction line of vector B3 passes through the magnetic sensing surface, the magnetic sensor 40 can generate an induced signal, and the magnetic sensor 40 can judge the activity of the rotor assembly 30 by sensing the vector B3 in the direction of H4 in the rotor magnetic field.

[0089] The rotor tangential vector is B3, and the rotor radial vector is B4. The smaller the angle between the magnetic sensing direction of the magnetic sensor 40 and the tangent line of the circle B at point A, the closer the angle between the magnetic sensing direction of the magnetic sensor 40 and H1 is to 90°, the weaker the effect of vector B2 on the magnetic sensor 40, and the stronger the effect of vector B3 on the magnetic sensor 40.

[0090] In this way, the vector B1 of the leakage magnetic field in the direction of H2 has a weak strength, and by forming an angle of 0°-45° between the magnetic sensing direction of the magnetic sensor 40 and the tangent direction of the circle B at point A, the direction of vector B1 is closer to the magnetic sensing direction, thereby avoiding the magnetic sensor 40 being affected by other coil magnetic field vectors with higher strength and different from the direction of H2, especially avoiding the magnetic sensor 40 being affected by the vector B2 in the direction of H1. The influence of the vector B2 in the direction of H1 on the magnetic sensor 40 is weak, so that the magnetic sensor 40 can avoid generating an induced signal under the action of the leakage magnetic field, thereby preventing the magnetic sensor 40 from misjudging the activity of the rotor assembly 30.

[0091] Figures 8 to 10 Three different arrangement postures of the magnetic sensor 40 are shown from a top view, which refers to a viewing angle directly opposite the end of the rotor assembly 30 and parallel to the axial direction of the rotor assembly 30. The direction of the arrow V in the figure is the magnetic sensing direction of the magnetic sensor 40, and the dashed line segment in the figure represents the tangent of the circle B at point A.

[0092] In an embodiment where the circuit board 60 includes a through hole 61 for the second mounting cavity 86 to pass through and for the rotor assembly 30 to move axially, the rotor assembly 30, the excitation coil 50, and the second mounting cavity 86 are coaxial. A circle D is constructed with point C as the center and a radius R2 smaller than R1, where radius R2 is the minimum distance from point C, located on the axis of the excitation coil 50, to the edge of the through hole 61. The magnetic sensor 40 is positioned on the outer periphery of circle D.

[0093] exist Figure 8 In the embodiment shown, the angle between the magnetic sensing direction of the magnetic sensor 40 and the tangent direction of the circle B at point A is 0°, the angle between the magnetic sensing direction and H2 is 0°, and the angle between the magnetic sensing direction and H1 is 90°, that is, the magnetic sensing direction is perpendicular to the direction H1 and parallel to the direction H2. Figures 2 to 4 The patch magnetic sensor shown, or the Figure 11-12 In the case of the plug-in magnetic sensor shown, the line connecting the first magnetic sensitive surface 411 and the second magnetic sensitive surface 412 is parallel to the direction H2.

[0094] With this arrangement, the magnetic sensor 40 senses the rotor tangential vector with a direction of H4, the rotor radial vector with a direction of H3 has no effect on the magnetic sensor 40, the vector B2 with a direction of H1 in the leakage magnetic field has no effect on the magnetic sensor 40, and the effect of the vector B1 with a direction of H2 in the leakage magnetic field on the magnetic sensor 40 is weak and negligible. At this time, the accuracy of the magnetic sensor 40 in judging the activity status of the rotor assembly 30 reaches the optimal level.

[0095] Optionally, the first magnetic sensitive surface 411 and the second magnetic sensitive surface 412 are both perpendicular to the circuit board 60 directly fixed with the magnetic sensor 40. Figures 2 to 4 When the chip magnetic sensor shown is attached to the circuit board 60 via the pin 42, or when Figure 11-12 When the plug-in sensor is connected to the circuit board 60 via pin 42, the magnetic sensing direction is parallel to the circuit board 60. With this arrangement, when the angle between the magnetic sensing direction and the tangent direction of circle B at point A is 0°, the magnetic flux lines of vector B3 in the rotor magnetic field with direction H4 can perpendicularly pass through the first magnetic sensing surface 411 and the second magnetic sensing surface 412. At this point, the magnetic sensor 40 achieves optimal accuracy in determining the movement of the rotor assembly 30.

[0096] exist Figure 9 In the embodiment shown, the angle between the magnetic sensing direction and the tangent direction of circle B at point A is 45°, and the angle between the magnetic sensing direction and H1 is 45°; Figure 10 In the illustrated embodiment, the angle between the magnetic sensing direction and the tangent direction of circle B at point A is 45°, and the angle between the magnetic sensing direction and H1 is 135°.

[0097] With this configuration, the effect of vector B2 in the direction H1 in the leakage magnetic field on the magnetic sensor 40 is limited, and vector B2 will not cause the magnetic sensor 40 to generate an induction signal. The effect of vector B1 in the direction H2 in the leakage magnetic field on the magnetic sensor 40 is even weaker and can be ignored.

[0098] Compared with the existing magnetic sensor arrangement, the motor structure and electronic valve of the present application enable the magnetic sensor 40 to fully sense the vector B3 with a direction of H4 in the rotor magnetic field, the component tangential magnetic field. Compared with the weak vector B1, the intensity of vector B3 is significantly higher, which can effectively act on the magnetic sensor 40 and generate an induction signal. Therefore, the rotor tangential vector B3 replaces the rotor radial vector B4 as the excitation source of the induction signal, and the magnetic sensor 40 is weakened by the interference of the leakage magnetic field, and the leakage magnetic field no longer serves as the excitation source of the induction signal.

[0099] In some embodiments, the magnetic sensor 40 is a thin plate-shaped magnetoresistive sensor. Optionally, the magnetic sensing surface of the magnetic sensor 40 is parallel to the axis of the rotor assembly 30. The magnetic sensor 40 is attached to the circuit board 60, and the pins 42 are soldered to the pads of the circuit board 60 to achieve electrical connection between the magnetic sensor 40 and the circuit board 60.

[0100] With this arrangement, the magnetic sensor 40 and the circuit board 60 do not need to be connected and fixed by means of an external bracket, and the motor structure has a lower cost, high durability, and is not easy to disassemble.

[0101] In some embodiments, the diameter of circle D is 20 mm, and the diameter of circle D is greater than or equal to the diameter of the rotor assembly 30. Preferably, the diameter of circle D is greater than the diameter of the rotor assembly 30, and the diameter of the rotor assembly 30 is 15 mm~20 mm. The shortest distance from the magnetic field sensing area 41 of the magnetic sensor 40 to the axis of the rotor assembly 30 is 8 mm~12 mm, and the distance from the magnetic sensor 40 to the axis of the rotor assembly 30 is greater than the radius of the rotor assembly 30.

[0102] Such a configuration ensures that the magnetic sensor 40 can fully sense the change in the magnetic field of the rotor assembly 30 , thereby reducing the sensing sensitivity of the magnetic sensor 40 and thus reducing the cost of the magnetic sensor 40 .

[0103] In some embodiments, see Figure 6-Figure 7 The circuit board 60 for carrying the magnetic sensor 40 includes a first side 62 and a second side 63. The first side 62 and the second side 63 are arranged opposite to each other along the axial direction of the rotor assembly 30. The magnetic sensor 40 is provided on the first side 62 and an electrical component 70 is provided on at least the second side 63.

[0104] Optionally, see Figure 5The first side 62 is the side of the circuit board 60 closer to the field coil 50, and the second side 63 is the side of the circuit board 60 farther away from the field coil 50 and closer to the cover 82. The magnetic sensor 40 is smaller in size than the other electrical components 70.

[0105] In this way, the magnetic sensor 40 and the other electrical components 70 are arranged on opposite sides of the circuit board 60, so that the area of the circuit board 60 is fully and efficiently utilized, more electrical components 70 can be arranged on the circuit board 60, and the internal space of the first mounting cavity 83 can be reasonably utilized and the height of the support 84 can be reduced. When the magnetic sensor 40 is a magneto-resistive sensor attached to and welded to the first side 62, the gap between the first side 62 and the bottom wall of the first mounting cavity 83 is smaller in height, and the distance from the cover 82 to the second side 63 is larger, so that more and larger electrical components 70 can be accommodated.

[0106] In other embodiments, the magnetic sensor 40 and the other electrical components 70 can also be arranged on the same side of the circuit board 60, the magnetic sensor 40 can also be arranged on the side of the circuit board 60 farther away from the field coil 50 and closer to the cover 82, the support 84 can be omitted, and the circuit board 60 can be fixedly sleeved on the outer wall of the second mounting cavity 86 through the through hole 61.

[0107] The rotor assembly 30 moves back and forth along the axis between the first position and the second position. In actual operation of the electronic valve, the rotor assembly 30 either moves from the first position to the second position while rotating in the positive direction about the axis of the rotor assembly 30, or moves from the second position to the first position while rotating in the negative direction about the axis of the rotor assembly 30. The top end of the rotor assembly 30, i.e., the end of the rotor assembly 30 closer to the cover 82, protrudes from the end of the field coil 50 closer to the cover 82, and the distance from the top end of the rotor assembly 30 to the cover 82 changes as the rotor assembly 30 moves back and forth between the first position and the second position.

[0108] When the rotor assembly 30 is in the first position, the distance from the top end of the rotor assembly 30 to the cover 82 is at a maximum, and at this time the top end of the rotor assembly 30 is not lower than the side of the magnetic sensor 40 facing away from the field coil 50; when the rotor assembly 30 is in the second position, the top end of the rotor assembly 30 is higher than the side of the circuit board 60 and the magnetic sensor 40 facing away from the field coil 50, and at this time the distance from the top end of the rotor assembly 30 to the cover 82 is at a minimum.

[0109] In this way, the magnetic sensor 40 is always within the magnetic field of the rotor assembly 30, ensuring that the magnetic sensor 40 can sense the magnetic field of the rotor assembly 30 at any time during the back-and-forth movement of the rotor assembly 30, so that the activity of the rotor assembly 30 can be judged in real time.

[0110] In some embodiments, the electronic valve further includes a shielding frame 90. The magnetic sensor 40 and the excitation coil 50 are located on opposite sides of the shielding frame 90, and the shielding frame 90 is located between the excitation coil 50 and the circuit board 60. The shielding frame 90 is made of a magnetically conductive material and covers the magnetic sensor 40. The shielding frame 90 can suppress the interference of the leakage magnetic field of the excitation coil 50 on the magnetic sensor 40, preventing the magnetic sensor 40 from mistaking changes in the leakage magnetic field of the excitation coil 50 for changes in the magnetic field of the rotor assembly 30, thereby preventing the magnetic sensor 40 from erroneously judging the movement of the rotor assembly 30 due to the leakage magnetic field of the excitation coil 50.

[0111] Optionally, the distance from the first side 62 to the end of the excitation coil 50 is 1 mm to 2.5 mm. Preferably, the distance from the first side 62 to the end of the excitation coil 50 is 1.5 mm.

[0112] With such an arrangement, the installation position of the magnetic sensor 40 is suitable. Even when the height of the top end of the rotor assembly 30 protruding from the excitation coil 50 reaches the minimum, the magnetic field of the rotor assembly 30 still acts on the magnetic sensor 40, preventing the magnetic sensor 40 from losing perception of the magnetic field of the rotor assembly 30 and avoiding misjudgment of the activity of the rotor assembly 30.

[0113] Specifically, the magnetic sensor 40 has a preset critical magnetic flux density value G. When the magnetic flux density sensed by the magnetic sensor 40 under the action of an external magnetic field changes between states above G and below G, the magnetic sensor 40 determines that the rotor assembly 30 is active. The external magnetic field varies depending on different operating conditions. For example, when current flows through the excitation coil 50 and the excitation coil 50 is wound around the outer periphery of the rotor assembly 30, the external magnetic field is a superposition of the coil magnetic field and the rotor assembly magnetic field. When no current flows through the excitation coil 50 wound around the outer periphery of the rotor assembly 30 or the current intensity is extremely low, the external magnetic field is the rotor assembly magnetic field. When current flows through the excitation coil 50 and the rotor assembly 30 is demagnetized in a high-temperature environment, the external magnetic field is the coil magnetic field.

[0114] The premise for the magnetic sensor 40 to normally sense the changes in the magnetic field of the rotor assembly to determine the activity status of the rotor assembly 30 is that: when the rotor assembly 30 and the magnetic sensor 40 are relatively stationary, the magnetic sensor 40 should be able to sense the magnetic field of the rotor assembly, and the magnetic density at the magnetic field sensing area 41 of the magnetic sensor 40 should be greater than G.

[0115] Optionally, in some embodiments, when the distance from the first side 62 to the end of the excitation coil 50 is 1.5 mm and the critical induced magnetic flux density value G is equal to 1.7 mT, even if the height of the top end of the rotor assembly 30 protruding from the excitation coil 50 reaches the minimum, it can still be ensured that the magnetic flux density at the magnetic field induction area 41 is not less than 1.7 mT.

[0116] Figures 13 to 30Simulation results of the magnetic sensor 40 sensing the external magnetic field under various working conditions are shown. These working conditions include both the coil and the rotor assembly acting on the magnetic sensor 40, and only the coil acting on the magnetic sensor. In the former case, the external magnetic field is the superposition of the coil magnetic field and the rotor assembly magnetic field, and in the latter case, the external magnetic field is the coil magnetic field.

[0117] In some embodiments, the magnetic sensor 40 has a magnetic field sensing region 41 in the shape of a cuboid. The horizontal coordinate represents the positions in the length interval of the magnetic field sensing region 41, and the unit of the horizontal coordinate value is millimeter (mm). The vertical coordinate represents the magnetic flux density of each position in the length interval of the magnetic field sensing region 41, and the unit of the vertical coordinate value is millitesla (mT). The length direction of the magnetic field sensing region 41 and the magnetic sensing direction are perpendicular to each other.

[0118] Figures 13 to 30 The simulation results are based on the following magnetic sensor: when the maximum magnetic flux density sensed by the magnetic sensor at any position in the length interval of the magnetic field sensing region is greater than 1.7 mT, and the minimum magnetic flux density sensed by the magnetic sensor at any position is less than 1.7 mT, the magnetic sensor takes this as the basis for the normal activity of the rotor assembly and generates an induction signal. A vertical coordinate value greater than 1.7 mT indicates that the corresponding position can be sensed by the magnetic sensor, showing a high level, and a vertical coordinate value less than 1.7 mT indicates that the corresponding position cannot be sensed by the magnetic sensor, showing a 0 level.

[0119] Figures 13 to 16 The simulation simulates the case where the magnetic sensor senses the coil magnetic field when only the coil is supplied with the first test current, i.e., to simply reflect the magnetic flux density distribution of the coil magnetic field in the length interval of the magnetic field sensing region when the coil is supplied with electricity. The first test current is 260 mA. The first test current is the coil current when the electronic valve is normally working, and is also the current that is stably maintained in the coil under most working conditions. The reason for simulating the case where only the coil is supplied with the first test current is mainly to consider that the magnetic sensor may generate an induction signal and make a false judgment of the activity of the rotor assembly when the rotor assembly demagnetizes in the existing electronic valve, and the rotor assembly demagnetization is a common situation in electronic valves, for example, high temperature generated by the coil current can cause the rotor assembly to demagnetize.

[0120] Specifically, Figure 13 The simulation results are based on the magnetic sensor being arranged according to the non-pre-set induction position state. When the magnetic sensor is arranged according to the non-pre-set induction position state, the magnetic sensing direction of the magnetic sensor is a certain radial direction of the rotor assembly (the same below, which will not be repeated here), and at this time, the maximum magnetic flux density of some positions in the length interval of the magnetic field sensing region is close to but does not reach 1.7 mT, and the minimum magnetic flux density of each position is about -1.5 mT. The maximum magnetic flux density and the minimum magnetic flux density are both less than 1.7 mT, indicating that the pure coil magnetic field will not cause the magnetic sensor to generate an induction signal and make a false judgment of the activity of the rotor assembly when the coil is supplied with the first test current.

[0121] Figure 14 The simulation results of the magnetic sensor are based on Figure 8 The test was performed in the first preset sensing configuration shown in FIG. At this time, the maximum magnetic flux density at each location within the length of the magnetic field sensing zone was approximately 0.6 mT, and the minimum magnetic flux density at each location was approximately -0.5 mT. Both the maximum and minimum magnetic flux densities were less than 1.7 mT. This indicates that when the magnetic sensor is arranged in the first preset sensing configuration, passing the first test current through the coil will not cause the magnetic sensor to generate an induction signal, meaning that the magnetic sensor will not misjudge rotor assembly activity.

[0122] Figure 15 The simulation results are based on the magnetic sensor being arranged in a non-preset sensing configuration and covered by a shielding frame. In this case, the maximum magnetic flux density at each location within the length of the magnetic field sensing zone is approximately 0.8 mT, and the minimum magnetic flux density at each location is approximately -0.8 mT. Both the maximum and minimum magnetic flux densities are less than 1.7 mT. This indicates that when the magnetic sensor is arranged in a non-preset sensing configuration and covered by a shielding frame, passing the first test current through the coil does not cause the magnetic sensor to generate an induction signal, meaning that the magnetic sensor will not misjudge rotor assembly activity.

[0123] Figure 16 The simulation results are based on the magnetic sensor being arranged in the first preset sensing position and covered by a shielding frame. At this point, the maximum magnetic flux density at each location within the length of the magnetic field sensing zone does not exceed 0.3 mT, and the minimum magnetic flux density at each location is no less than -0.4 mT. Both the maximum and minimum magnetic flux densities are less than 1.7 mT. This indicates that when the magnetic sensor is arranged in the first preset sensing position and covered by the shielding frame, passing the first test current through the coil will not cause the magnetic sensor to generate an induction signal, meaning that the magnetic sensor will not misjudge rotor assembly activity.

[0124] Figures 17 to 20 The simulation is used to simulate the situation where the magnetic sensor senses the coil magnetic field and the rotor assembly magnetic field when the rotor assembly is fixed and the first test current flows through the coil. That is, it is used to reflect the magnetic density distribution of the composite magnetic field formed by the superposition of the rotor assembly magnetic field and the coil magnetic field within the length range of the magnetic field sensing area when the rotor assembly is stuck.

[0125] Specifically, Figure 17 The simulation results are based on the magnetic sensors being arranged in a non-preset sensing configuration with the rotor assembly stationary. In this case, the maximum magnetic flux density at all locations within the magnetic field sensing zone length is greater than 1.9 mT, and the minimum magnetic flux density at all locations is less than 0 mT. The maximum and minimum magnetic flux densities are greater than and less than 1.7 mT, respectively. This indicates that when the magnetic sensors are arranged in a non-preset sensing configuration with the rotor assembly stationary, passing the first test current through the coil will cause the magnetic sensors to generate an induction signal, leading to a false judgment of rotor assembly activity.

[0126] Figure 18 The simulation results are based on the magnetic sensors being arranged in the first preset sensing configuration and the rotor assembly being stationary. At this time, the maximum magnetic flux density at each location within the magnetic field sensing zone is approximately greater than 2.6 mT, and the minimum magnetic flux density at each location is approximately greater than 2.2 mT. Both the maximum and minimum magnetic flux densities are greater than 1.7 mT. This indicates that when the magnetic sensors are arranged in the first preset sensing configuration and the rotor assembly is stationary, passing the first test current through the coil will not cause the magnetic sensors to generate an induction signal, and the magnetic sensor will not misjudge rotor assembly activity.

[0127] Figure 19 The simulation results are based on the magnetic sensor being arranged in a non-preset sensing position, covered by a shielding frame, and with the rotor assembly stationary. In this case, the maximum magnetic flux density at most locations within the magnetic field sensing zone is less than 1.7 mT, and the minimum magnetic flux density at all locations is less than 0.7 mT. This indicates that when the magnetic sensor is arranged in a non-preset sensing position, covered by a shielding frame, and the rotor assembly is stationary, passing the first test current through the coil does not cause the magnetic sensor to generate an induction signal, and the magnetic sensor will not misjudge rotor assembly activity.

[0128] Figure 20 The simulation results are based on the magnetic sensor being arranged in the first preset sensing position, covered by a shielding frame, and with the rotor assembly stationary. In this case, the maximum magnetic flux density at all locations within the magnetic field sensing zone is greater than 1.8 mT, and the minimum magnetic flux density at all locations is greater than 1.8 mT. This indicates that when the magnetic sensor is arranged in the first preset sensing position, covered by a shielding frame, and the rotor assembly is stationary, passing the first test current through the coil will not cause the magnetic sensor to generate an induction signal, and the magnetic sensor will not falsely detect rotor assembly activity.

[0129] Figures 21 to 24 The situation in which the magnetic sensor senses the coil magnetic field and the rotor assembly magnetic field when the rotor assembly is operating normally and a first test current flows through the coil is simulated. That is, the magnetic flux density distribution within the length range of the magnetic field sensing area of ​​the composite magnetic field formed by the superposition of the rotor assembly magnetic field and the coil magnetic field when the rotor assembly is operating normally is reflected.

[0130] Specifically, Figure 21 The simulation results are based on the magnetic sensor being positioned in a non-preset sensing configuration and the rotor assembly operating normally. The maximum magnetic flux density at each location within the magnetic field sensing zone length is greater than 3.5 mT, and the minimum magnetic flux density at each location is less than -2.0 mT. This indicates that when the magnetic sensor is positioned in a non-preset sensing configuration and the rotor assembly is operating normally, the first test current flowing through the coil causes the magnetic sensor to generate an induction signal, allowing the magnetic sensor to accurately determine rotor assembly activity.

[0131] Figure 22The simulation results are based on the magnetic sensor being positioned in the first preset sensing position and the rotor assembly operating normally. At this point, the maximum magnetic flux density at all locations within the magnetic field sensing area is greater than 4mT, and the minimum magnetic flux density at all locations is less than -4mT. This indicates that when the magnetic sensor is positioned in the first preset sensing position and the rotor assembly is operating normally, the first test current flowing through the coil causes the magnetic sensor to generate an induction signal, allowing the magnetic sensor to accurately determine rotor assembly activity.

[0132] Figure 23 The simulation results are based on the magnetic sensor being placed in a non-preset sensing position, covered by a shielding frame, and with the rotor assembly operating normally. The maximum magnetic flux density at all locations within the magnetic field sensing area is greater than 2.5 mT, and the minimum magnetic flux density at all locations is less than -4.5 mT. This indicates that when the magnetic sensor is placed in a non-preset sensing position, covered by a shielding frame, and the rotor assembly is operating normally, passing the first test current through the coil will cause the magnetic sensor to generate an induction signal, allowing the magnetic sensor to accurately determine rotor assembly activity.

[0133] Figure 24 The simulation results are based on the magnetic sensor being arranged in the first preset sensing position, covered by the shielding frame, and with the rotor assembly operating normally. The maximum magnetic flux density at all locations within the magnetic field sensing area is greater than 1.7 mT, and the minimum magnetic flux density at all locations is less than -1.7 mT. This indicates that when the magnetic sensor is arranged in the first preset sensing position, covered by the shielding frame, and the rotor assembly is operating normally, the first test current flowing through the coil causes the magnetic sensor to generate an induction signal, allowing the magnetic sensor to accurately determine rotor assembly activity.

[0134] Figures 25 to 30 This simulation simulates the magnetic field sensing behavior of the magnetic sensor in various scenarios when a second test current is passed through the coil. The second test current is 310mA, and passing this second test current through the coil corresponds to the actual operating condition where the coil experiences a transient current surge in rare circumstances. This multi-condition simulation, performed with the second test current in the coil, takes into account that conventional electronic valves generate a strong coil magnetic field when a transient current surge occurs within the coil. This magnetic field can cause the magnetic sensor to generate an induction signal, leading to an erroneous judgment of rotor assembly activity.

[0135] Specifically, Figure 25 The simulation results are based on the magnetic sensor being placed in a non-preset sensing configuration with only the second test current flowing through the coil. The maximum magnetic flux density at each location within the magnetic field sensing zone length is approximately 2.3 mT, and the minimum magnetic flux density at each location is approximately -2.1 mT. This indicates that when the magnetic sensor is placed in a non-preset sensing configuration with only the second test current flowing through the coil, the coil's magnetic field causes the magnetic sensor to generate an induction signal, leading to a false positive in the rotor assembly's activity.

[0136] Figure 26 The simulation results are based on the magnetic sensor being arranged in the first preset sensing configuration with only the second test current flowing through the coil. In this case, the maximum magnetic flux density at any location within the magnetic field sensing zone length does not exceed 0.6 mT, and the minimum magnetic flux density at any location is no less than -0.6 mT. This indicates that when the magnetic sensor is arranged in the first preset sensing configuration with only the second test current flowing through the coil, the coil's magnetic field does not induce a signal in the magnetic sensor, and therefore the magnetic sensor does not misjudge rotor assembly activity.

[0137] Figure 27 The simulation results are based on the magnetic sensor being positioned in a non-preset sensing configuration, with the rotor assembly stationary and a second test current flowing through the coil. The maximum magnetic flux density at each location within the magnetic field sensing zone length was greater than 2.5 mT, and the minimum magnetic flux density at each location was less than -0.2 mT. This indicates that when the magnetic sensor is positioned in a non-preset sensing configuration, with the rotor assembly stationary and the second test current flowing through the coil, the combined magnetic field formed by the coil magnetic field and the rotor assembly magnetic field causes the magnetic sensor to generate an induction signal, leading to a false positive in the rotor assembly activity.

[0138] Figure 28 The simulation results are based on the magnetic sensor being positioned in the first preset sensing configuration, the rotor assembly being stationary, and the second test current flowing through the coil. The maximum magnetic flux density at each location within the magnetic field sensing zone is greater than 3.5 mT, and the minimum magnetic flux density at each location is greater than 2 mT. This indicates that when the magnetic sensor is positioned in the first preset sensing configuration, the rotor assembly is stationary, and the second test current is flowing through the coil, the composite magnetic field formed by the superposition of the coil and rotor magnetic fields does not generate an induction signal in the magnetic sensor, and therefore the magnetic sensor does not misjudge rotor assembly activity.

[0139] Figure 29 The simulation results are based on the magnetic sensor being positioned in a non-preset sensing configuration, the rotor assembly operating normally, and a second test current flowing through the coil. The maximum magnetic flux density at each location within the magnetic field sensing zone length is greater than 3.6 mT, and the minimum magnetic flux density at each location is less than -3.6 mT. This indicates that when the magnetic sensor is positioned in a non-preset sensing configuration, the rotor assembly is operating normally, and the second test current is flowing through the coil, the combined magnetic field formed by the coil magnetic field and the rotor assembly magnetic field causes the magnetic sensor to generate an induction signal, allowing the magnetic sensor to accurately determine rotor assembly activity.

[0140] Figure 30The simulation results are based on the magnetic sensor being positioned in the first preset sensing configuration, the rotor assembly operating normally, and the second test current flowing through the coil. At this time, the maximum magnetic flux density at each location within the length of the magnetic field sensing zone was greater than 2.8 mT, and the minimum magnetic flux density at each location was less than -2.0 mT. This indicates that when the magnetic sensor is positioned in the first preset sensing configuration, the rotor assembly is operating normally, and the second test current is flowing through the coil, the composite magnetic field formed by the superposition of the coil magnetic field and the rotor assembly magnetic field causes the magnetic sensor to generate an induction signal, allowing the magnetic sensor to accurately determine rotor assembly activity.

[0141] The following describes another embodiment of the motor structure and electronic valve. Figure 31 is a schematic diagram of a motor structure according to another embodiment, Figure 34 FIG. 4 is a cross-sectional view of an electronic valve according to another embodiment.

[0142] See Figure 31 、 Figure 33 In some embodiments, the electronic valve includes a shielding frame 90, and the circuit board 60 is provided with a through hole 61, which penetrates the circuit board 60 on two opposite sides of the rotor assembly 30 along the axial direction. The circuit board 60 is perpendicular to the axial direction of the rotor assembly 30, and the second mounting cavity 86 and the rotor assembly 30 pass through the through hole 61.

[0143] In other embodiments, circuit board 60 need not have through-hole 61, nor need circuit board 60 be perpendicular to the axial direction of rotor assembly 30. Circuit boards 60 may be one or more. When there are multiple circuit boards 60, circuit boards 60 include a first circuit board and a second circuit board that are separately provided. Magnetic sensor 40 is electrically connected to and fixedly supported by the first circuit board. The first circuit board and the second circuit board are electrically connected to each other. The second circuit board includes a signal processing unit for acquiring and processing the sensing signal from magnetic sensor 40.

[0144] For example, when the first mounting cavity 83 is small or irregular in shape, a small-sized first circuit board can be used to carry the magnetic sensor 40 and be electrically connected to the magnetic sensor 40. The first circuit board and the magnetic sensor 40 are accommodated in the first mounting cavity 83, and then a second circuit board is arranged outside the first mounting cavity 83, and other components such as a signal processing unit are arranged on the second circuit board. In this way, the miniaturization of the motor structure can be achieved.

[0145] The first circuit board and the excitation coil 50 may be arranged along the axial direction of the rotor assembly 30 , and the first circuit board and the second circuit board may be arranged along the radial direction of the rotor assembly 30 , or in other directions.

[0146] The first circuit board can be connected to the end of the excitation coil 50 by snapping, bonding or injection molding. The first circuit board and the second circuit board can be conductively connected through wires, plug-in interfaces, welding, etc. The plug-in interfaces enable the first circuit board and the second circuit board to be disassembled and reassembled multiple times, thereby facilitating the maintenance and repair of the motor structure.

[0147] The first circuit board has a conductive circuit that is conductively connected to the magnetic sensor 40, and the conductive circuit is used to transmit the sensing signal of the magnetic sensor 40. The second circuit board has a control circuit, and the control circuit can be electrically connected to the excitation coil 50 and the signal processing unit. The sensing signal is transmitted to the control circuit via the conductive circuit, and then the signal processing unit obtains the sensing signal and adjusts the power supply of the external power supply to supply electrical energy to the excitation coil 50.

[0148] In some embodiments, the shell also includes a third installation cavity, the first circuit board and the magnetic sensor 40 are arranged in the first installation cavity 83, and the second circuit board and other electrical components 70 arranged on the second circuit board can be arranged in the third installation cavity. In this way, when inspecting the circuit board 60 or other electrical components, only the third installation cavity can be opened without opening the first installation cavity, thereby better protecting the magnetic sensor 40.

[0149] In addition to the magnetic sensor 40, the first circuit board may be provided with other electrical components 70. Of course, the first circuit board may also only carry the magnetic sensor 40 without other electrical components 70. It will be understood that when there is only one circuit board 60, the conductive circuit and the control circuit are integrated on the same circuit board 60. In this case, all electrical components 70, including the signal processing unit, are provided on the same circuit board 60.

[0150] See Figure 34 The shell includes a placement shell 81, a cover 82 and a sleeve shell 85. The placement shell 81 is a thin-walled structure with a hollow interior. An open first installation cavity 83 is formed inside the placement shell 81. The first installation cavity 83 is used to accommodate and install the magnetic sensor 40 and the circuit board 60. The opening of the first installation cavity 83 is covered by the cover 82. The sleeve shell 85 is connected to one end of the placement shell 81 relatively far away from the cover 82. The interior of the sleeve shell 85 is used to accommodate the excitation coil 50. In addition, the interior of the sleeve shell 85 also has a second installation cavity 86. A part of the second installation cavity 86 extends into the first installation cavity 83. The second installation cavity 86 can allow the rotor assembly 30 to move axially and rotate around the axis. The second installation cavity 86 extending into the first installation cavity 83 is penetrated by the through hole 61, and the excitation coil 50 surrounds the outer circumference of the rotor assembly 30 and the second installation cavity 86.

[0151] Optionally, a protruding support 84 is provided on the bottom wall of the first installation cavity 83, and the support 84 is used to support the circuit board 60. The bottom wall of the first installation cavity 83 is the inner wall surface of the first installation cavity 83 facing the cover 82. The circuit board 60 is raised by the support 84 and is spaced apart from the bottom wall of the first installation cavity 83. The other side of the bottom wall of the first installation cavity 83 is the excitation coil 50. The electrical components 70 and the magnetic sensor 40 can be arranged on the side of the circuit board 60 relatively close to the excitation coil 50.

[0152] Existing motor structures are unable to accurately determine the activity of the rotor assembly. The coils surrounding the rotor assembly inevitably leak magnetic flux during the excitation process. The magnetic sensor generates an induction signal under the interference of this leakage magnetic field. This makes it difficult for the magnetic sensor to identify the excitation source of the induction signal, potentially mistaking it for the magnetic field of the rotor assembly, making it impossible to accurately determine the actual activity of the rotor assembly. For example, if the rotor assembly is stuck and motionless, the leakage magnetic field of the coils acts on the magnetic sensor, causing it to generate an induction signal and mistakenly believe that the rotor assembly is operating normally.

[0153] To address this issue, existing solenoid valves are equipped with a shielding frame, which provides magnetic sensor shielding protection against magnetic flux leakage, thereby reducing the impact of the magnetic field on the sensor. However, the existing shielding frame is large in size, covering not only the magnetic sensor but also other components on the circuit board, or even the entire circuit board. Furthermore, the shielding frame is installed at the coil end via injection molding, making installation difficult, increasing the assembly cost and time of the solenoid valve, and complicating the assembly process. Furthermore, to prevent interference between the shielding frame and these components, the shielding frame and the circuit board must be spaced relatively far apart, necessitating an increase in the axial dimension of the rotor assembly. Otherwise, when the rotor assembly moves below the magnetic sensor, the magnetic sensor will not be able to sense the rotor assembly's magnetic field. Clearly, the existing shielding frame and the large axial dimension of the rotor assembly restrict the miniaturization of the solenoid valve.

[0154] The electronic valve of the present invention makes the following improvements:

[0155] The circuit board 60 fixed to the shielding frame 90 directly carries the magnetic sensor 40. At least a portion of the shielding frame 90 is located on a side of the magnetic sensor 40 relatively close to the excitation coil 50 and covers the magnetic sensor 40. That is, at least a portion of the shielding frame 90 is arranged opposite to the first side 62 of the circuit board 60 carrying the magnetic sensor 40, and the magnetic sensor 40 and the excitation coil 50 are respectively located on opposite sides of the shielding frame 90.

[0156] The shielding frame 90 is made of a magnetic conductive material. Optionally, the shielding frame 90 is a thin plate made of Q235 steel. The shielding frame 90 and the circuit board 60 can be fixedly connected in a form of welding, bonding, plugging, etc.

[0157] After the shielding frame 90 is fixedly connected to the circuit board 60, the two and the magnetic sensor 40 together form an assembly unit. This assembly unit is assembled as a whole at one time as the circuit board 60 is assembled into the first installation cavity 83. During the assembly of the electronic valve, there is no need to assemble the shielding frame 90 and the circuit board 60 separately, which simplifies the assembly process of the electronic valve and reduces the difficulty, cost and time of assembling the electronic valve. In addition, during the assembly of the electronic valve, the shielding frame 90 can be used to protect the magnetic sensor 40 to prevent the magnetic sensor 40 from being damaged.

[0158] Combine Figures 31 to 35 In the illustrated embodiment, circuit board 60 is sleeved within the wall of second mounting cavity 86 via through-hole 61. Circuit board 60 abuts and is stably supported by support 84. When circuit board 60 is properly installed within first mounting cavity 83, magnetic sensor 40, circuit board 60, and shielding frame 90 are assembled as a single unit within first mounting cavity 83. Shielding frame 90 prevents support 84 from accidentally contacting magnetic sensor 40. It also prevents the wall of second mounting cavity 86 from accidentally contacting magnetic sensor 40, potentially preventing damage to the sensor and potentially rendering the motor structure useless.

[0159] Furthermore, the present application achieves a miniaturized structure for the shield frame 90. The shield frame 90 only needs to be large enough to cover the magnetic sensor 40, thereby blocking the coil's leakage magnetic field. The shield frame 90 does not need to cover other components on the circuit board 60. Therefore, the distance between the shield frame 90's cover plate 91 and the circuit board 60 can be reduced. This, in turn, shortens the axial dimension of the rotor assembly 30, ultimately miniaturizing the motor structure and the electronic valve. Through the technical solution of the present application, the distance from the magnetic sensor to the coil end can be reduced to 0.5 mm to 2 mm.

[0160] like Figures 31 to 35 As shown, in some embodiments, the side of the circuit board 60 for carrying the magnetic sensor 40 that is relatively close to the excitation coil 50 is a first side 62, and the other side of the circuit board 60 that is relatively far from the excitation coil 50 is a second side 63. The first side 62 and the second side 63 are arranged opposite each other along the axial direction of the rotor assembly 30. The magnetic sensor 40 is provided on the first side 62, and at least the second side 63 is provided with an electrical component 70. The electrical component 70 provided on the first side 62 includes a magnetic working element 71. Specifically, the first side 62 includes a magnetic isolation surface area and a magnetic receiving surface area. The magnetic sensor 40 is provided on the magnetic isolation surface area, and the magnetic working element 71 is provided on the magnetic receiving surface area. The area where the orthographic projection area of ​​the shielding frame 90 on the first side 62 is located is the magnetic isolation surface area, and the area located on the first side 62 and outside the magnetic isolation surface area is the magnetic receiving surface area.

[0161] Specifically, see Figure 31-32The shielding frame 90 includes a cover plate 91 and a flange 92 that are bent and connected. The cover plate 91 is spaced apart from the circuit board 60. For example, a preset accommodation gap 93 is formed between the cover plate 91 and the first side 62 to accommodate the magnetic sensor 40. The height of the preset accommodation gap 93 is greater than the thickness of the magnetic sensor 40. The flange 92 is fixedly connected to the circuit board 60, and the edge of the magnetic sensor 40 does not protrude from any edge of the cover plate 91. When the motor structure is observed in a line of sight parallel to the axis of the rotor assembly 30, the magnetic sensor 40 is completely covered by the cover plate 91 and is not visible. Optionally, the magnetic sensor 40 is a magnetoresistive sensor. The magnetic sensor 40 is attached to the magnetic isolation surface area. The pins of the magnetic sensor 40 are welded and fixed to the pads on the circuit board 60 to achieve electrical connection between the magnetic sensor 40 and the circuit board 60.

[0162] With such an arrangement, the shielding frame 90 has a significant magnetic isolation effect on the magnetic sensor 40, and the possibility of the leakage magnetic field of the excitation coil 50 acting on the magnetic sensor 40 is reduced, making it more difficult for the magnetic sensor 40 to sense the leakage magnetic field; an anti-touch gap is formed between the cover plate 91 and the magnetic sensor 40, and the height of the anti-touch gap is the difference between the height of the preset accommodating gap 93 and the thickness of the magnetic sensor 40. The anti-touch gap can ensure that the magnetic sensor 40 is not crushed by the cover plate 91; the electrical connection and fixed connection between the magnetic sensor 40 and the circuit board 60 are reliable, and there is no need to use an external bracket to connect the magnetic sensor 40 and the circuit board 60. The production cost of the motor structure is lower, the durability is better, and it is not easy to disintegrate.

[0163] See again Figure 32 There are two flanges 92, and the two flanges 92 are arranged at both ends of the same side of the cover plate 91. Each flange 92 includes a supporting edge 921 and a board-attaching edge 922. The supporting edge 921 is bent and connected to the end edge of the cover plate 91 and protrudes toward the circuit board 60. The board-attaching edge 922 is bent and connected to the end of the supporting edge 921 relatively away from the cover plate 91. The first side 62 of the circuit board 60 and the board-attaching edge 922 are surface-fitted and fixed.

[0164] Optionally, the first side 62 is welded to the board edge 922. In this way, the shielding frame 90 and the circuit board 60 are stably and reliably attached, and the two are not easily separated to cause the motor structure to disintegrate.

[0165] Preferably, the first side 62 and the board edge 922 are welded and fixed by the SMT patch packaging process, and the cover plate 91 and the flange 92 are an integrally formed and inseparable structure. The cover plate 91 and the flange 92 are obtained by bending and deforming an independent plate. The shielding frame 90 is simpler in molding and lighter in structure, which further reduces the cost of the motor structure and the electronic valve.

[0166] In other embodiments, the first side 62 is bonded and fixed to the board edge 922, or the circuit board 60 is further provided with a slot, and the board edge 922 is embedded in the slot so as to be fixedly plugged into the circuit board 60. The depth direction of the slot can be perpendicular to the circuit board 60, parallel to the circuit board 60, or in other directions.

[0167] The cover plate 91 and the flange 92 can also be formed separately and fixedly connected by bonding, splicing, fitting, etc.; the shielding frame 90 can also be an arc-shaped bent plate, at least one of the two ends of the shielding frame 90 is fixedly connected to the circuit board 60, and a gap is formed between the shielding frame 90 and the circuit board 60 for accommodating the magnetic sensor 40.

[0168] exist Figures 31 to 35 In the illustrated embodiment, the cover plate 91 is a rectangular plate-like structure. The pattern of the cover plate 91 projected onto the first side 62 of the circuit board 60 is the magnetic isolation surface area. The magnetic isolation surface area is a rectangular surface area, that is, the shielding frame 90 only covers one of the rectangular surface areas on the first side 62 of the circuit board 60, and the portion of the first side 62 not covered by the shielding frame 90 forms a magnetic surface area for setting the magnetic working element 71.

[0169] With such an arrangement, while ensuring that the leakage magnetic field of the excitation coil 50 does not affect the magnetic sensor 40, the magnetic working element 71 is not covered by the shielding frame 90. The magnetic working element 71 is still in the magnetic field environment of the excitation coil 50 and operates normally under the action of the magnetic field of the excitation coil 50, which meets the electromagnetic compatibility requirements of the motor structure and also limits the size of the shielding frame 90 to the greatest extent, reducing the area occupied by the shielding frame 90 on the first side 62, so as to obtain a larger magnetic receiving area and thus deploy more magnetic working elements 71.

[0170] Furthermore, the shielding frame 90 does not protrude from the outer periphery of the circuit board 60, nor does it protrude from the edge of the escape opening. Figures 31 to 35 In the illustrated embodiment, the circuit board 60 is approximately rectangular with rounded corners. As previously described, the escape opening is a through-hole 61 formed in the circuit board 60. The shielding frame 90 does not protrude beyond the outer edge of the rounded rectangle of the circuit board 60, nor does it protrude beyond the edge of the through-hole 61. The edge of the through-hole 61 serves as the edge of the escape opening. This arrangement prevents interference between the walls of the mounting housing 81 and the shielding frame 90 during installation of the circuit board 60 into the first mounting cavity 83. Furthermore, the second mounting cavity 86 does not interfere with the shielding frame 90 during insertion through the through-hole 61. This prevents the shielding frame 90 from shaking or even falling out due to contact with the walls of the mounting housing 81 or the walls of the second mounting cavity 86.

[0171] The various technical features of the above-described embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0172] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. Any appropriate changes and modifications to the above embodiments fall within the scope of the present invention as long as they are within the spirit of the present invention.

Claims

1. An electronic valve, characterized in that: It comprises a valve body (10), a valve core (20), a stator assembly, a rotor assembly (30), and an electrically connected circuit board (60) and a magnetic sensor (40); The valve body (10) has a valve port (11), the valve core (20) cooperates with the valve port (11), the rotor assembly (30) is drivingly connected to the valve core (20), the stator assembly includes an excitation coil (50), and the axes of the rotor assembly (30) and the excitation coil (50) are collinear; The magnetic sensor (40) senses the magnetic field change of the rotor assembly (30) and generates an induction signal. The magnetic sensing surface of the magnetic sensor (40) has a point A. A circle B is drawn with a distance R1 from point A to the axis of the rotor assembly (30) as a radius. The center of circle B is point C located on the axis of the rotor assembly (30). The magnetic field intensity of the excitation coil (50) passing through point A can be decomposed into multiple vectors, one of which is B1, the direction of B1 is H2, and the direction H2 is the tangent direction of circle B at point A; The magnetic sensing direction of the magnetic sensor (40) forms an angle of 0° to 45° with the tangent direction of circle B at point A.

2. The electronic valve according to claim 1, wherein The decomposition vector of the magnetic field intensity of the excitation coil (50) passing through point A also includes B2, the value of B2 is higher than the value of B1, the direction of B2 is H1, H1 is the direction of the line connecting point A and point C, and the magnetic sensing direction of the magnetic sensor (40) forms an angle of 45° to 135° with H1.

3. The electronic valve according to claim 2, wherein: The angle between the magnetic sensing direction of the magnetic sensor (40) and H2 is 0°, and the angle between the magnetic sensing direction of the magnetic sensor (40) and H1 is 90°.

4. The electronic valve according to claim 1, wherein: The magnetic field strength of the rotor assembly (30) passing through point A can be decomposed into multiple vectors, one of which is B3, the direction of B3 is H4, H4 is the tangent direction of circle B at point A, and the value of B3 is higher than the value of B1.

5. The electronic valve according to claim 1, wherein The magnetic sensor (40) has a magnetic field sensing area (41) therein, and the magnetic sensitive surface includes a first magnetic sensitive surface (411) and a second magnetic sensitive surface (412) formed on opposite sides of the magnetic field sensing area (41) and arranged in parallel, and the line connecting the first magnetic sensitive surface (411) and the second magnetic sensitive surface (412) is parallel to H2.

6. The electronic valve according to claim 5, wherein: The first magnetically sensitive surface (411) and the second magnetically sensitive surface (412) are both perpendicular to the circuit board (60).

7. The electronic valve according to claim 1, wherein: The circuit board (60) has a through hole (61) for the rotor assembly (30) to pass through along the axial direction, and the through hole (61), the rotor assembly (30) and the excitation coil (50) are coaxial. A circle D is drawn with point C as the center and a radius R2 smaller than R1, wherein the radius R2 is the shortest distance from point C located on the axis of the rotor assembly (30) to the edge of the through hole (61); and the magnetic sensor (40) is arranged on the outer peripheral side of the circle D.

8. The electronic valve according to claim 1, wherein: The stator assembly further includes a housing, the housing including a first mounting cavity (83) and a second mounting cavity (86) isolated from each other, at least a portion of the circuit board (60) is located in the first mounting cavity (83), and the rotor assembly (30) is located in the second mounting cavity (86), wherein: The first mounting cavity (83) and the excitation coil (50) are arranged along the axial direction of the excitation coil (50), and the circuit board (60) is perpendicular to the axis of the excitation coil (50).

9. The electronic valve according to claim 1, wherein: The stator assembly further includes a housing, the housing including a first mounting cavity (83) and a second mounting cavity (86) isolated from each other, at least a portion of the circuit board (60) is located in the first mounting cavity (83), the rotor assembly (30) is located in the second mounting cavity (86), and the first mounting cavity (83) and the second mounting cavity (86) are arranged along the radial direction of the excitation coil (50).

10. The electronic valve according to claim 9, wherein The circuit board (60) located in the first installation cavity (83) includes a first circuit board and a second circuit board that are electrically connected. The magnetic sensor (40) is located on the first circuit board, the first circuit board is perpendicular to the axis of the excitation coil (50), and the second circuit board is parallel to the axis of the excitation coil (50).

11. The electronic valve according to claim 1, wherein The circuit board (60) is arranged on the outer peripheral side of the rotor assembly (30), and the circuit board (60) and the excitation coil (50) are arranged axially along the rotor assembly (30); and / or the magnetic sensor (40) is a magnetoresistive sensor, and the magnetoresistive sensor has a pin (42), and the pin (42) is attached to the circuit board (60).

12. The electronic valve according to claim 11, wherein The magnetic sensor (40) is arranged on a side of the circuit board (60) close to the excitation coil (50), and an electrical component (70) is arranged on a side of the circuit board (60) facing away from the excitation coil (50).

13. The electronic valve according to claim 1, wherein The electronic valve further comprises a shielding frame (90) fixedly connected to the circuit board (60), wherein at least a portion of the shielding frame (90) is located on a side of the magnetic sensor (40) relatively close to the excitation coil (50) and covers the magnetic sensor (40).

14. The electronic valve according to claim 13, wherein: The shielding frame (90) includes a cover plate (91), the cover plate (91) is spaced from the circuit board (60) to accommodate the magnetic sensor (40), and the edge of the magnetic sensor (40) does not protrude from the edge of the cover plate (91).

15. The electronic valve according to claim 14, wherein: The shielding frame (90) also includes a flange (92) bent and connected to the cover plate (91), and the flange (92) includes a board edge (922) that is surface-fitted with the circuit board (60), and the board edge (922) is welded and fixed to the circuit board (60); or, the board edge (922) is adhesively fixed to the circuit board (60); or, the board edge (922) is plugged and fixed to the circuit board (60).

16. The electronic valve according to claim 13, wherein The shielding frame (90) is an arc-shaped bent plate. At least one end of the shielding frame (90) is fixedly connected to the circuit board (60). A gap is provided between the shielding frame (90) and the circuit board (60) to accommodate the magnetic sensor (40).

17. The electronic valve according to any one of claims 13 to 16, wherein: The circuit board (60) has a clearance opening for the rotor assembly (30) to extend through, and the shielding frame (90) does not protrude from the outer periphery of the circuit board (60) and does not protrude from the edge of the clearance opening; and / or, The side of the circuit board (60) relatively close to the excitation coil (50) includes a magnetic isolation surface area and a magnetic receiving surface area, and the area where the projection area of ​​the shielding frame (90) on the side of the circuit board (60) relatively close to the excitation coil (50) is located is the magnetic isolation surface area; An area of ​​the circuit board (60) that is relatively close to the excitation coil (50) and outside the magnetic isolation surface area is the magnetic receiving surface area, and a magnetic working element (71) is provided on the magnetic receiving surface area.

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