Electronic valve

Abstract

The application provides an electronic valve, which comprises 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 is matched with the valve port, the rotor assembly is drivingly connected with the valve core, the stator assembly comprises an excitation coil, and the rotor assembly is collinear with the axis of the excitation coil; the magnetic sensor senses the magnetic field change of the rotor assembly and generates an induction signal, the magnetic induction 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 a 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 the vectors 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 induction direction of the magnetic sensor and the tangent direction of the circle B at the point A form an included angle of 0°-45°.

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 intensity of the rotor assembly passing 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, the magnetic sensing surface includes a first magnetic sensing surface and a second magnetic sensing surface formed on opposite sides of the magnetic field sensing area and arranged in parallel, and the line connecting the first magnetic sensing surface and the second magnetic sensing surface is parallel to H2.

[0010] In some embodiments, the first magnetic sensing surface and the second magnetic sensing 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 along the axial direction, the through hole, the rotor assembly and the excitation coil are coaxial; taking point C as the center and a radius R2 smaller than R1 to make a circle D, the radius R2 is the closest distance from point C on the rotor assembly axis to the edge of the through hole; the magnetic sensor is arranged on the outer periphery of the circle D.

[0012] In some embodiments, the stator assembly further includes a housing, the housing includes 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, and 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 housing, the housing includes 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, and the rotor assembly is located in the second mounting cavity, 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 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 periphery of the rotor assembly, and the circuit board and the excitation coil are arranged along the axial direction of the rotor assembly; and / or, the magnetic sensor is a magnetoresistive sensor, and the magnetoresistive sensor has a pin attached to the circuit board.

[0016] In some embodiments, the magnetic sensor is arranged on the circuit board at a side close to the field coil, and a side of the circuit board away from the field coil is arranged with an electrical element.

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

[0018] In some embodiments, the shielding frame comprises a cover plate 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 further comprises a flange bently connected to the cover plate, the flange comprises a plate edge in surface contact with the circuit board, and the plate edge is fixedly welded to the circuit board; or the plate edge is fixedly adhered to the circuit board; or the plate edge is fixedly inserted 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 the shielding frame is spaced apart from the circuit board to accommodate the magnetic sensor.

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

[0022] The side of the circuit board close to the field coil comprises a magnetic shielding surface domain and a magnetic receiving surface domain, and a projection area of the shielding frame on a region of the side of the circuit board close to the field coil is the magnetic shielding surface domain.

[0023] A region of the side of the circuit board close to the field coil and outside the magnetic shielding surface domain is the magnetic receiving surface domain, and the magnetic receiving surface domain is provided with a magnetic working element.

[0024] The electronic valve of the present application has the following advantages:

[0025] The vector of the magnetic field generated by the excitation coil in the H2 direction has weak strength, the magnetic induction direction of the magnetic sensor and the tangent direction of the circle B at the point A form an included angle of 0°-45°, the vector of the magnetic field generated by the excitation coil in the H2 direction is closer to the magnetic induction direction of the magnetic sensor, so that the magnetic sensor is not easily excited by the leakage magnetic field of the excitation coil to generate an induction signal, and thus the magnetic sensor of the electronic valve can prevent misjudgment of the activity of the rotor assembly. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic view of a motor structure of an electronic valve according to an embodiment of the present application in a top view;

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

[0028] Figure 3 A schematic view of the internal structure of the magnetic sensor shown in Figure 2

[0029] A sectional view of the magnetic sensor shown in along the F-F plane; Figure 4 Figure 3 A sectional view of the magnetic sensor shown in along the F-F plane;

[0030] Figure 5 A sectional view of the magnetic sensor shown in along the F-F plane;

[0031] Figure 6 A sectional view of the magnetic sensor shown in along the F-F plane;

[0032] Figure 7 A schematic view of a magnetic sensor of an electronic valve in a first preset induction position in a top view;

[0033] Figure 8 A schematic view of a magnetic sensor of an electronic valve in a second preset induction position in a top view;

[0034] Figure 9 A schematic view of a magnetic sensor of an electronic valve in a third preset induction position in a top view;

[0035] Figure 10 A schematic view of a motor structure of an electronic valve according to another embodiment of the present application;

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

[0037] Figure 12 A schematic view of a motor structure of an electronic valve according to another embodiment of the present application; Figure 11 ​Internal configuration diagram of the magnetic sensor of the motor structure shown;

[0038] Figure 13 Simulation result diagram of the magnetic sensor arranged in the non-pre-set sensing position state sensing the magnetic field of the coil when the coil passes the first test current;

[0039] Figure 14 Simulation result diagram of the magnetic sensor arranged in the first pre-set sensing position state sensing the magnetic field of the coil when the coil passes the first test current;

[0040] Figure 15 Simulation result diagram of the magnetic sensor arranged in the non-pre-set sensing position state and covered by the shielding frame sensing the magnetic field of the coil when the coil passes the first test current;

[0041] Figure 16 Simulation result diagram of the magnetic sensor arranged in the first pre-set sensing position state and covered by the shielding frame sensing the magnetic field of the coil when the coil passes the first test current;

[0042] Figure 17 Simulation result diagram of the magnetic sensor arranged in the non-pre-set sensing position state sensing the external magnetic field when the rotor assembly is not moving;

[0043] Figure 18 Simulation result diagram of the magnetic sensor arranged in the first pre-set sensing position state sensing the external magnetic field when the rotor assembly is not moving;

[0044] Figure 19 Simulation result diagram of the magnetic sensor arranged in the non-pre-set sensing position state and covered by the shielding frame sensing the external magnetic field when the rotor assembly is not moving;

[0045] Figure 20 Simulation result diagram of the magnetic sensor arranged in the first pre-set sensing position state and covered by the shielding frame sensing the external magnetic field when the rotor assembly is not moving;

[0046] Figure 21 Simulation result diagram of the magnetic sensor arranged in the non-pre-set sensing position state sensing the external magnetic field when the rotor assembly is normally moving;

[0047] Figure 22 Simulation result diagram of the magnetic sensor arranged in the first pre-set sensing position state sensing the external magnetic field when the rotor assembly is normally moving;

[0048] Figure 23 Simulation result diagram of the magnetic sensor arranged in the non-pre-set sensing position state and covered by the shielding frame sensing the external magnetic field when the rotor assembly is normally moving;

[0049] Figure 24Simulation result diagram of the magnetic sensor sensing the external magnetic field when the coil is supplied with the second test current and the rotor assembly is not moving, using the non-pre-set sensing position arrangement;

[0050] Figure 25 Simulation result diagram of the magnetic sensor sensing the coil magnetic field when the coil is supplied with the second test current, using the non-pre-set sensing position arrangement;

[0051] Figure 26 Simulation result diagram of the magnetic sensor sensing the coil magnetic field when the coil is supplied with the second test current, using the first pre-set sensing position arrangement;

[0052] Figure 27 Simulation result diagram of the magnetic sensor sensing the external magnetic field when the coil is supplied with the second test current and the rotor assembly is not moving, using the non-pre-set sensing position arrangement;

[0053] Figure 28 Simulation result diagram of the magnetic sensor sensing the external magnetic field when the coil is supplied with the second test current and the rotor assembly is not moving, using the first pre-set sensing position arrangement;

[0054] Figure 29 Simulation result diagram of the magnetic sensor sensing the external magnetic field when the coil is supplied with the second test current and the rotor assembly is normally moving, using the non-pre-set sensing position arrangement;

[0055] Figure 30 Simulation result diagram of the magnetic sensor sensing the external magnetic field when the coil is supplied with the second test current and the rotor assembly is normally moving, using the first pre-set sensing position arrangement;

[0056] Figure 31 Structural schematic diagram of the motor structure of the electronic valve of another embodiment of the present application;

[0057] Figure 32 Structural schematic diagram of the motor structure of the electronic valve of another embodiment of the present application; Figure 31 Partial enlarged schematic diagram of the motor structure shown in A;

[0058] Figure 33 Exploded schematic diagram of the motor structure of the electronic valve of another embodiment of the present application;

[0059] Figure 34 Sectional view of the electronic valve of another embodiment of the present application;

[0060] Figure 35 Sectional view of the electronic valve of another embodiment of the present application; Figure 34 Partial enlarged schematic diagram of the electronic valve shown in B.

[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, bearing platform; 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 one or more of the items referenced, 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 comprises a first installation cavity 83 and a second installation cavity 86 which are isolated from each other, the magnetic sensor 40 and at least a part of the circuit board 60 are located in the first installation cavity 83, and the rotor assembly 30 is located in the second installation cavity 86, the axis of the rotor assembly 30, the second installation cavity 86 and the excitation coil 50 are in line, the first installation cavity 83 and the excitation coil 50 are arranged along the axial direction of the rotor assembly 30 and the excitation coil 50, and the circuit board 60 in the first installation cavity 83 is perpendicular to the axis of the excitation coil 50 and the rotor assembly 30.

[0067] The electronic valve comprises the motor structure, further comprises a valve body 10, a valve core 20 arranged on the valve body 10, the valve body 10 is provided with a valve port 11 and a flow channel which are communicated, the valve core 20 is matched with the valve port 11, the rotor assembly 30 is drivingly connected with the valve core 20, and the magnetic sensor 40 and the circuit board 60 are arranged on the outer circumferential side of the rotor assembly 30. Optionally, the circuit board 60 and the excitation coil 50 are arranged in sequence along the axial direction of the rotor assembly 30.

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

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

[0070] Further, the circuit board located in the first installation cavity 83 comprises a first circuit board and a second circuit board which are electrically connected, the magnetic sensor 40 is fixedly arranged on the first circuit board and electrically connected with the first circuit board, the first circuit board is perpendicular to the axis of the rotor assembly 30 and the excitation coil 50, the second circuit board is parallel to the axis of the excitation coil 50, and the first circuit board and the second circuit board can be electrically connected through a wire or a plug-in interface.

[0071] In this way, the arrangement of the motor structure is more compact, by arranging the first circuit board and the second circuit board in different arrangement modes respectively, the defect that the volume of the motor structure is large and the space occupied is large caused by using one large-size circuit board can be overcome, and the electronic valve structure can be compact.

[0072] The excitation coil 50 is used to generate an induced magnetic field after energization. The rotor assembly 30 is a columnar structure made of magnetic material. The rotor assembly 30 moves along the axial direction of the rotor assembly 30 and rotates around the axis of the rotor assembly 30 under the action of the magnetic field of the excitation coil 50. The valve core 20 is driven by the rotor assembly 30 to change the unblocking situation of the flow passage in the valve body 10, so as to change the flow path of the fluid. The magnetic sensor 40 is used to sense the change of the magnetic field of the rotor assembly 30 and generate an induced signal. The induced signal is transmitted by the circuit board 60 and used as a basis for judging the movement of the rotor assembly 30.

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

[0074] In some embodiments, the circuit board 60 has a relief port through which the rotor assembly 30 extends along the axial direction, so as to avoid interference between the rotor assembly 30 and the circuit board 60. In other embodiments, the circuit board 60 is spaced apart from the rotor assembly 30 and does not have a relief port.

[0075] Referring to Figure 1 , Figures 5-7 The relief port is a through hole 61 formed in the circuit board 60. The through hole 61 penetrates the two sides of the circuit board 60 along the axial direction of the rotor assembly 30, and the rotor assembly 30 passes through the through hole 61. The shape of the relief port is not limited. In the embodiment shown in the drawings, the through hole 61 serving as the relief port is a circumferentially closed hole with an inner wall. In other embodiments, the relief port can also be a notch formed by recessing the edge of the circuit board 60.

[0076] Referring to Figure 5 The shell includes a mounting shell 81, a cover 82, and a sleeve shell 85. The mounting shell 81 is a hollow thin-walled structure. The mounting shell 81 forms a first installation cavity 83 in an open manner inside. 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 mounting shell 81 away from the cover 82. The inside of the sleeve shell 85 is used to accommodate the excitation coil 50. In addition, the inside of the sleeve shell 85 has a second installation cavity 86. Part of the second installation cavity 86 extends into the first installation cavity 83. The second installation cavity 86 is used for the axial movement and rotation of the rotor assembly 30 around the axis. The second installation cavity 86 extending into the first installation cavity 83 extends through the relief port. The excitation coil 50 surrounds the outer peripheral side of the rotor assembly 30 and the second installation cavity 86.

[0077] Referring to Figures 5-7The 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 Figures 2-3 , Figures 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 2-4 , Figures 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 2-4 The magnetic sensor 40 shown in Figures 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] The prior art generally arranges the magnetic sensor to be consistent with the radial direction of the rotor assembly, and the magnetic field strength of any position of the rotor magnetic field acting on the magnetic sensing surface can be decomposed into two vectors in different directions, i.e., a rotor radial vector and a rotor tangential vector, the direction of the rotor radial vector is represented by an arrow H3 in Figures 8-10 , and the direction of the rotor tangential vector is represented by an arrow H4 in Figures 8-10 . In the prior art, the magnetic sensor senses the rotor radial vector and generates a sensing signal.

[0083] However, the excitation coil 50 on the outer circumferential side of the rotor assembly 30 will inevitably have magnetic leakage (magnetic leakage is a magnetic field generated by the coil to interfere with the magnetic sensor signal) during excitation. Once the excitation coil 50 has magnetic leakage, the magnetic sensor arranged in the prior art will generate a sensing signal under the interference of the magnetic leakage magnetic field, so it is difficult to confirm the source of the sensing signal, and thus it is impossible to accurately determine whether the rotor assembly 30 is moving and the actual movement of the rotor assembly 30. For example, when the rotor assembly 30 is stuck, the magnetic leakage magnetic field of the excitation coil 50 will act on the magnetic sensor 40, and at this time the magnetic sensor 40 generates a sensing signal to make an incorrect judgment that the rotor assembly 30 is still moving.

[0084] The magnetic sensor 40 of the motor structure of the present application has a point A, which is specifically located in the magnetic sensing surface of the magnetic sensor 40. A circle B is made with the distance R1 from the point A to the axis of the excitation coil 50 as the radius, and the center of the circle B is a point C located on the axis of the excitation coil 50. As shown in Figures 8-10 , the magnetic field strength of the excitation coil 50 passing through the 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 the circle B at the point A, and the magnetic sensing direction of the magnetic sensor 40 and the tangent direction of the circle B at the point A form an included angle of 0°-45°.

[0085] Referring again to Figures 8-10 , the magnetic field strength of the excitation coil 50 passing through the point A also includes a vector B2, the strength value of the vector B2 is higher than that of the vector B1, the direction of the vector B2 is H1, the direction H1 is the direction of the line connecting the point A and the point C, i.e., the direction H1 and the direction H2 are perpendicular to each other, and the magnetic sensing direction of the magnetic sensor 40 and H1 form an included angle of 45°-135°. Specifically, as shown in the magnetic sensor 40 shown in Figure 9 , the magnetic sensing direction and H1 form an included angle of 45°, and as shown in the magnetic sensor 40 shown in Figure 10 , the magnetic sensing direction and H1 form an included angle of 135°.

[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 8-10 , 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 8-10 Three different arrangement postures of the magnetic sensor 40 are shown from the top view, and the top view refers to the observation view angle of directly facing the end of the rotor assembly 30 and the line of sight direction being 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 has 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 obtained by drawing a circle with point C as the center and a radius R2 less than R1, where radius R2 is the shortest distance from point C on the axis of the excitation coil 50 to the edge of the through hole 61. The magnetic sensor 40 is then located on the outer periphery of circle D.

[0093] exist Figure 8 In the illustrated embodiment, the angle between the magnetic sensing direction of the magnetic sensor 40 and the tangent direction of 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°, meaning the magnetic sensing direction is perpendicular to direction H1 and parallel to direction H2. When the magnetic sensor 40 employs... Figures 2-4 The patch magnetic sensor shown, or using, for example Figures 11-12 In the case of the plug-in magnetic sensor shown, the line connecting the first magnetic sensing surface 411 and the second magnetic sensing surface 412 is parallel to the direction H2.

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

[0095] Optionally, both the first magnetic sensing surface 411 and the second magnetic sensing surface 412 are perpendicular to the circuit board 60 that directly supports the magnetic sensor 40. Figures 2-4 The surface-mount magnetic sensor shown is attached to the circuit board 60 via pin 42, or when... Figures 11-12 When the plug-in sensor is plugged into the circuit board 60 via pin 42, the magnetic sensing direction is parallel to the circuit board 60. With this configuration, when the angle between the magnetic sensing direction and the tangent direction of circle B at point A is 0°, the magnetic field lines of vector B3 with direction H4 in the rotor magnetic field can pass perpendicularly through the first magnetic sensing surface 411 and the second magnetic sensing surface 412. At this time, the accuracy of the magnetic sensor 40 in determining the activity of the rotor assembly 30 reaches its optimal level.

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

[0097] In this way, the vector B2 in the direction of H1 in the magnetic leakage field has limited effect on the magnetic sensor 40, and the vector B2 does not cause the magnetic sensor 40 to generate an induced signal. The vector B1 in the direction of H2 in the magnetic leakage field has even weaker effect on the magnetic sensor 40, which can be ignored.

[0098] Compared with the existing magnetic sensor arrangement, the motor structure and the electronic valve of the present application enable the magnetic sensor 40 to fully sense the vector B3 in the direction of H4 in the rotor magnetic field, i.e. the tangential magnetic field of the assembly. The vector B3 has significantly higher intensity than the weak vector B1, and can effectively act on the magnetic sensor 40 and generate an induced signal. Thus, the rotor tangential vector B3 replaces the rotor radial vector B4 as the excitation source of the induced signal, and the magnetic sensor 40 is less disturbed by the magnetic leakage field, which is no longer the excitation source of the induced 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 welded to the pads of the circuit board 60 to achieve electrical connection between the magnetic sensor 40 and the circuit board 60.

[0100] In this way, the magnetic sensor 40 and the circuit board 60 are connected and fixed without the aid of an external bracket, and the motor structure has lower cost, higher durability and is less likely to disassemble.

[0101] In some embodiments, the diameter of the circle D is 20㎜, and the diameter of the circle D is greater than or equal to the diameter of the rotor assembly 30. Preferably, the diameter of the circle D is greater than the diameter of the rotor assembly 30. The diameter of the rotor assembly 30 is 15㎜~20㎜, 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㎜~12㎜, 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] In this way, the magnetic sensor 40 can fully sense the change in the magnetic field of the rotor assembly 30, and thus the sensing sensitivity of the magnetic sensor 40 can be reduced to reduce the cost of the magnetic sensor 40.

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

[0104] Optionally, referring to 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 comprises a shielding frame 90, the magnetic sensor 40 and the field coil 50 are located on opposite sides of the shielding frame 90 respectively, and the shielding frame 90 is located between the field coil 50 and the circuit board 60. The shielding frame 90 is made of a magnetic conductive material and covers the magnetic sensor 40. The shielding frame 90 can inhibit the interference of the leakage magnetic field of the field coil 50 on the magnetic sensor 40, prevent the magnetic sensor 40 from mistaking the change of the leakage magnetic field of the field coil 50 as the change of the magnetic field of the rotor assembly 30, and avoid the magnetic sensor 40 from erroneously judging the activity of the rotor assembly 30 under the action of the leakage magnetic field of the field coil 50.

[0111] Optionally, the distance from the first side 62 to the end of the field coil 50 is 1㎜~2.5㎜, and preferably, the distance from the first side 62 to the end of the field coil 50 is 1.5㎜.

[0112] In this way, the installation position of the magnetic sensor 40 is appropriate, and even when the height of the top end of the rotor assembly 30 protruding from the field 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 the perception of the magnetic field of the rotor assembly 30 and avoiding the erroneous judgment of the activity of the rotor assembly 30.

[0113] Specifically, the magnetic sensor 40 has a preset critical magnetic induction value G. When the magnetic induction value sensed by the magnetic sensor 40 under the action of an external magnetic field changes between higher than G and lower than G, the magnetic sensor 40 determines the activity of the rotor assembly 30 accordingly. The external magnetic field varies according to different working conditions. For example, when the field coil 50 has a current flowing therethrough and the field coil 50 is wound around the outer periphery of the rotor assembly 30, the external magnetic field is the superposition of the coil magnetic field and the rotor assembly magnetic field; when the field coil 50 wound around the outer periphery of the rotor assembly 30 has no current flowing therethrough or has a very low current flowing therethrough, the external magnetic field is the rotor assembly magnetic field; when the field coil 50 has a current flowing therethrough and the rotor assembly 30 is demagnetized in a high-temperature environment, the external magnetic field is the coil magnetic field.

[0114] The prerequisite for the magnetic sensor 40 to normally sense the change of the rotor assembly magnetic field to judge the activity of the rotor assembly 30 is that, in the state that the rotor assembly 30 and the magnetic sensor 40 are relatively static, the magnetic sensor 40 should be able to sense the rotor assembly magnetic field, and the magnetic induction 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 field coil 50 is 1.5㎜ and the critical magnetic induction value G is equal to 1.7mT, even when the height of the top end of the rotor assembly 30 protruding from the field coil 50 reaches the minimum, the magnetic induction at the magnetic field sensing area 41 can still be ensured to be not less than 1.7mT.

[0116] Figures 13-30Simulation 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 13-30 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 13-16 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 are based on magnetic sensors according to... Figure 8 The magnetic sensor is arranged in the first preset induction state as shown. At this time, the maximum magnetic flux density at each position within the length range of the magnetic field induction zone is about 0.6 mT, and the minimum magnetic flux density at each position is about -0.5 mT. Both the maximum and minimum magnetic flux density are less than 1.7 mT, indicating that when the magnetic sensor is arranged in the first preset induction state, the first test current flowing through the coil will not cause the magnetic sensor to generate an induction signal, that is, the magnetic sensor will not make a misjudgment of the rotor assembly activity.

[0122] Figure 15 The simulation results are based on the magnetic sensor being arranged in a non-preset induction state and covered by a shielding frame. At this time, the maximum magnetic flux density at each position within the length range of the magnetic field induction zone is about 0.8 mT, and the minimum magnetic flux density at each position is about -0.8 mT. Both the maximum and minimum magnetic flux density are less than 1.7 mT, indicating that when the magnetic sensor is arranged in a non-preset induction state and covered by a shielding frame, the first test current flowing through the coil will not cause the magnetic sensor to generate an induction signal, that is, the magnetic sensor will not make a misjudgment of the rotor assembly activity.

[0123] Figure 16 The simulation results are based on the magnetic sensor being arranged in the first preset induction state and covered by a shielding frame. At this time, the maximum magnetic flux density at each position within the length range of the magnetic field induction zone does not exceed 0.3mT, the minimum magnetic flux density at each position is not less than -0.4mT, and both the maximum and minimum magnetic flux density are less than 1.7mT. This indicates that when the magnetic sensor is arranged in the first preset induction state and covered by a shielding frame, the first test current flowing through the coil will not cause the magnetic sensor to generate an induction signal, that is, the magnetic sensor will not make a misjudgment of the rotor assembly activity.

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

[0125] Specifically, Figure 17 The simulation results are based on the magnetic sensor being arranged in a non-preset induction state with the rotor assembly fixed. In this case, the maximum magnetic flux density at each position within the length range of the magnetic field induction zone is greater than 1.9 mT, and the minimum magnetic flux density at each position is less than 0 mT. The maximum and minimum magnetic flux density are greater than and less than 1.7 mT, respectively. This indicates that when the magnetic sensor is arranged in a non-preset induction state with the rotor assembly fixed, the first test current flowing through the coil will cause the magnetic sensor to generate an induction signal, thus making a misjudgment of rotor assembly movement.

[0126] Figure 18 The simulation result of the magnetic sensor arranged in the first preset sensing position and the rotor assembly fixed is based on that the maximum magnetic flux density of each position in the length interval of the magnetic field sensing area is greater than 2.6 mT, the minimum magnetic flux density of each position is greater than 2.2 mT, the maximum magnetic flux density and the minimum magnetic flux density are both greater than 1.7 mT, which indicates that when the magnetic sensor is arranged in the first preset sensing position and the rotor assembly is fixed, the first test current passing through the coil will not cause the magnetic sensor to generate an induced signal, and the magnetic sensor will not make a false judgment of the activity of the rotor assembly.

[0127] Figure 19 The simulation result of the magnetic sensor arranged in the first preset sensing position and the rotor assembly fixed is based on that the maximum magnetic flux density of each position in the length interval of the magnetic field sensing area is greater than 2.6 mT, the minimum magnetic flux density of each position is greater than 2.2 mT, the maximum magnetic flux density and the minimum magnetic flux density are both greater than 1.7 mT, which indicates that when the magnetic sensor is arranged in the first preset sensing position and the rotor assembly is fixed, the first test current passing through the coil will not cause the magnetic sensor to generate an induced signal, and the magnetic sensor will not make a false judgment of the activity of the rotor assembly.

[0128] Figure 20 The simulation result of the magnetic sensor arranged in the first preset sensing position and the rotor assembly fixed is based on that the maximum magnetic flux density of each position in the length interval of the magnetic field sensing area is greater than 2.6 mT, the minimum magnetic flux density of each position is greater than 2.2 mT, the maximum magnetic flux density and the minimum magnetic flux density are both greater than 1.7 mT, which indicates that when the magnetic sensor is arranged in the first preset sensing position and the rotor assembly is fixed, the first test current passing through the coil will not cause the magnetic sensor to generate an induced signal, and the magnetic sensor will not make a false judgment of the activity of the rotor assembly.

[0129] Figures 21-24 The simulation result of the magnetic sensor arranged in the first preset sensing position and the rotor assembly fixed is based on that the maximum magnetic flux density of each position in the length interval of the magnetic field sensing area is greater than 2.6 mT, the minimum magnetic flux density of each position is greater than 2.2 mT, the maximum magnetic flux density and the minimum magnetic flux density are both greater than 1.7 mT, which indicates that when the magnetic sensor is arranged in the first preset sensing position and the rotor assembly is fixed, the first test current passing through the coil will not cause the magnetic sensor to generate an induced signal, and the magnetic sensor will not make a false judgment of the activity of the rotor assembly.

[0130] Specifically, Figure 21 The simulation result of the magnetic sensor arranged in the first preset sensing position and the rotor assembly fixed is based on that the maximum magnetic flux density of each position in the length interval of the magnetic field sensing area is greater than 2.6 mT, the minimum magnetic flux density of each position is greater than 2.2 mT, the maximum magnetic flux density and the minimum magnetic flux density are both greater than 1.7 mT, which indicates that when the magnetic sensor is arranged in the first preset sensing position and the rotor assembly is fixed, the first test current passing through the coil will not cause the magnetic sensor to generate an induced signal, and the magnetic sensor will not make a false judgment of the activity of the rotor assembly.

[0131] Figure 22The simulation result of the magnetic sensor in the first preset induction position is based on the magnetic sensor arranged in the first preset induction position and the normal activity of the rotor assembly. At this time, the maximum magnetic density of each position in the magnetic field induction area is greater than 4 mT, and the minimum magnetic density of each position is less than -4 mT, indicating that when the magnetic sensor is arranged in the first preset induction position and the rotor assembly is normally active, passing the first test current in the coil will cause the magnetic sensor to generate an induction signal, so the magnetic sensor can make a correct judgment of the activity of the rotor assembly.

[0132] Figure 23 The simulation result of the magnetic sensor in the first preset induction position is based on the magnetic sensor arranged in the first preset induction position and the normal activity of the rotor assembly. At this time, the maximum magnetic density of each position in the magnetic field induction area is greater than 4 mT, and the minimum magnetic density of each position is less than -4 mT, indicating that when the magnetic sensor is arranged in the first preset induction position and the rotor assembly is normally active, passing the first test current in the coil will cause the magnetic sensor to generate an induction signal, so the magnetic sensor can make a correct judgment of the activity of the rotor assembly.

[0133] Figure 24 The simulation result of the magnetic sensor in the first preset induction position is based on the magnetic sensor arranged in the first preset induction position and the normal activity of the rotor assembly. At this time, the maximum magnetic density of each position in the magnetic field induction area is greater than 4 mT, and the minimum magnetic density of each position is less than -4 mT, indicating that when the magnetic sensor is arranged in the first preset induction position and the rotor assembly is normally active, passing the first test current in the coil will cause the magnetic sensor to generate an induction signal, so the magnetic sensor can make a correct judgment of the activity of the rotor assembly.

[0134] Figures 25-30 The simulation result of the magnetic sensor in the first preset induction position is based on the magnetic sensor arranged in the first preset induction position and the normal activity of the rotor assembly. At this time, the maximum magnetic density of each position in the magnetic field induction area is greater than 4 mT, and the minimum magnetic density of each position is less than -4 mT, indicating that when the magnetic sensor is arranged in the first preset induction position and the rotor assembly is normally active, passing the first test current in the coil will cause the magnetic sensor to generate an induction signal, so the magnetic sensor can make a correct judgment of the activity of the rotor assembly.

[0135] Specifically, Figure 25 The simulation result of the magnetic sensor in the first preset induction position is based on the magnetic sensor arranged in the first preset induction position and the normal activity of the rotor assembly. At this time, the maximum magnetic density of each position in the magnetic field induction area is greater than 4 mT, and the minimum magnetic density of each position is less than -4 mT, indicating that when the magnetic sensor is arranged in the first preset induction position and the rotor assembly is normally active, passing the first test current in the coil will cause the magnetic sensor to generate an induction signal, so the magnetic sensor can make a correct judgment of the activity of the rotor assembly.

[0136] Figure 26 The simulation results are based on the magnetic sensor being arranged in the first preset induction state with only the second test current flowing through the coil. At this time, the maximum magnetic flux density at each position within the length range of the magnetic field induction zone does not exceed 0.6 mT, and the minimum magnetic flux density at each position is not less than -0.6 mT. This indicates that when the magnetic sensor is arranged in the first preset induction state with only the second test current flowing through the coil, the coil magnetic field will not cause the magnetic sensor to generate an induction signal, and therefore the magnetic sensor will not make a misjudgment of the rotor assembly activity.

[0137] Figure 27 The simulation results are based on the magnetic sensor being arranged in a non-preset induction state, the rotor assembly being stationary, and a second test current flowing through the coil. In this case, the maximum magnetic flux density at each location within the length range of the magnetic field induction zone is greater than 2.5 mT, and the minimum magnetic flux density at each location is less than -0.2 mT. This indicates that when the magnetic sensor is arranged in a non-preset induction state, the rotor assembly is stationary, and a second test current flows through the coil, the composite magnetic field formed by the superposition of the coil magnetic field and the rotor assembly magnetic field will cause the magnetic sensor to generate an induction signal, thus leading to a misjudgment of rotor assembly movement by the magnetic sensor.

[0138] Figure 28 The simulation results are based on the magnetic sensor being arranged in the first preset induction state, the rotor assembly being stationary, and the coil carrying the second test current. At this time, the maximum magnetic flux density at each position within the length range of the magnetic field induction zone is greater than 3.5 mT, and the minimum magnetic flux density at each position is greater than 2 mT. This indicates that when the magnetic sensor is arranged in the first preset induction state, the rotor assembly is stationary, and the coil carries the second test current, the composite magnetic field formed by the superposition of the coil magnetic field and the rotor assembly magnetic field will not cause the magnetic sensor to generate an induction signal. Therefore, the magnetic sensor will not make a false judgment about the movement of the rotor assembly.

[0139] Figure 29 The simulation results are based on the magnetic sensor being arranged in a non-preset induction state, the rotor assembly being in normal operation, and a second test current flowing through the coil. In this case, the maximum magnetic flux density at each position within the length range of the magnetic field induction zone is greater than 3.6 mT, and the minimum magnetic flux density at each position is less than -3.6 mT. This indicates that when the magnetic sensor is arranged in a non-preset induction state, the rotor assembly is in normal operation, and a second test current flows through the coil, the composite magnetic field formed by the superposition of the coil magnetic field and the rotor assembly magnetic field will cause the magnetic sensor to generate an induction signal. Therefore, the magnetic sensor can correctly determine the movement of the rotor assembly.

[0140] Figure 30The simulation result is based on the magnetic sensor arranged according to the first preset induction position, the normal activity of the rotor assembly and the second test current passing through the coil. At this time, the maximum magnetic density of each position in the length interval of the magnetic field induction area is greater than 2.8mT, and the minimum magnetic density of each position is less than -2.0mT, indicating that under the condition that the magnetic sensor is arranged according to the first preset induction position, the rotor assembly is normally active, and the second test current passes through the coil, the composite magnetic field formed by the superposition of the coil magnetic field and the rotor assembly magnetic field will cause the magnetic sensor to generate an induction signal, so that the magnetic sensor can make a correct judgment of the activity of the rotor assembly.

[0141] The following describes the motor structure and electronic valve of another embodiment, Figure 31 The following describes the motor structure and electronic valve of another embodiment, Figure 34 The following describes the motor structure and electronic valve of another embodiment,

[0142] Referring to Figure 31 , Figure 33 In some embodiments, the electronic valve includes a shielding frame 90, the circuit board 60 is provided with a through hole 61, the through hole 61 passes through the circuit board 60 along the two sides of the rotor assembly 30 which are axially opposite, 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, the circuit board 60 does not need to be provided with a through hole 61, and the circuit board 60 does not need to be perpendicular to the axial direction of the rotor assembly 30. The number of circuit boards 60 can be one or more. When the number of circuit boards 60 is more than one, the circuit boards 60 include a first circuit board and a second circuit board which are separately arranged, the magnetic sensor 40 is electrically connected to the first circuit board and is fixedly carried by the first circuit board, the first circuit board and the second circuit board are electrically connected, and the second circuit board is provided with a signal processing unit for acquiring and processing the induction signal of the magnetic sensor 40.

[0144] For example, when the first mounting cavity 83 is narrow in space 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 mounting cavity 83 accommodates the first circuit board and the magnetic sensor 40, and then a second circuit board is arranged outside the first mounting cavity 83, and the second circuit board is provided with a signal processing unit and other components. In this way, the motor structure can be miniaturized.

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

[0146] The first circuit board can be connected to the end of the excitation coil 50 by clamping, bonding or injection molding. The first and second circuit boards can be electrically connected by wires, plug-in interfaces, welding, etc. The plug-in interface allows the first and second circuit boards to be repeatedly disassembled and reassembled, thereby facilitating maintenance and repair of the motor structure.

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

[0148] In some embodiments, the housing further includes a third mounting cavity. The first circuit board and the magnetic sensor 40 are arranged in the first mounting cavity 83. The second circuit board and other electrical elements 70 arranged on the second circuit board can be arranged in the third mounting cavity. In this way, when the circuit board 60 or other electrical elements are being repaired, only the third mounting cavity needs to be opened, and the first mounting cavity does not need to be opened, thereby better protecting the magnetic sensor 40.

[0149] In addition to the magnetic sensor 40, the first circuit board can be provided with other electrical elements 70. Of course, the first circuit board can also only carry the magnetic sensor 40 without other electrical elements 70. It can be understood that when the number of circuit boards 60 is one, the electrically conductive circuit and the control circuit are integrated on the same circuit board 60. At this time, all electrical elements 70 including the signal processing unit are arranged on the same circuit board 60.

[0150] Referring to Figure 34 The housing includes a mounting shell 81, a cover 82 and a sleeve shell 85. The mounting shell 81 is a thin-walled structure with an internal cavity. The first mounting cavity 83 is formed in the mounting shell 81 and is open. The first mounting cavity 83 is used to accommodate and mount the magnetic sensor 40 and the circuit board 60. The opening of the first mounting cavity 83 is covered by the cover 82. The sleeve shell 85 is connected to the end of the mounting shell 81 opposite to the cover 82. The inside of the sleeve shell 85 is used to accommodate the excitation coil 50. In addition, the inside of the sleeve shell 85 has a second mounting cavity 86. Part of the second mounting cavity 86 extends into the first mounting cavity 83. The second mounting cavity 86 allows the rotor assembly 30 to move axially and rotate around the axis. The second mounting cavity 86 extending into the first mounting cavity 83 is arranged in the through hole 61. The excitation coil 50 is arranged around the outer circumferential side of the rotor assembly 30 and the second mounting cavity 86.

[0151] Optionally, the bottom wall of the first mounting cavity 83 is provided with a protruding support platform 84, the support platform 84 is used to lift the circuit board 60, the bottom wall of the first mounting cavity 83 is an inner wall surface of the first mounting cavity 83 and the cover 82 is arranged opposite to each other, the circuit board 60 is spaced apart from the bottom wall of the first mounting cavity 83 by the support platform 84, and the other side of the bottom wall of the first mounting cavity 83 is the excitation coil 50. The side of the circuit board 60 close to the excitation coil 50 can be arranged with the electrical element 70 and the magnetic sensor 40.

[0152] The existing motor structure cannot accurately determine the activity of the rotor assembly. The coil outside the rotor assembly inevitably leaks magnetic field during excitation. The magnetic sensor will generate an induction signal under the interference of the leakage magnetic field. In this way, the magnetic sensor is difficult to confirm the source of the induction signal, and it is possible to mistakenly think that the source of the induction signal is the magnetic field of the rotor assembly, so that the actual activity of the rotor assembly cannot be accurately determined. For example, when the rotor assembly is stuck and does not move, the leakage magnetic field of the coil acts on the magnetic sensor, causing the magnetic sensor to generate an induction signal and mistakenly thinking that the rotor assembly is normally active.

[0153] To this end, the existing electromagnetic valve is equipped with a shielding frame, which provides leakage shielding protection for the magnetic sensor to weaken the influence of the leakage magnetic field on the magnetic sensor. However, the existing shielding frame is relatively large in size, covering not only the magnetic sensor but also other components on the circuit board, and even covering the entire circuit board. The shielding frame is installed on the end of the coil through an injection molding process. Therefore, the existing shielding frame is inconvenient to install, and the assembly cost and time of the electromagnetic valve are high, and the assembly process is complex. In order to prevent interference between the shielding frame and these components, the distance between the shielding frame and the circuit board is large. Therefore, the axial size of the rotor assembly needs to be increased. Otherwise, when the rotor assembly moves below the magnetic sensor, the magnetic sensor cannot sense the magnetic field of the rotor assembly. Obviously, the existing shielding frame and the rotor assembly with a large axial size restrict the miniaturization of the electromagnetic valve.

[0154] The electronic valve of the present application is improved as follows:

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

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

[0157] The shielding frame 90 is fixedly connected with the circuit board 60, and the shielding frame 90, the circuit board 60 and the magnetic sensor 40 together form an assembly unit. The assembly unit is integrally and one-time assembled in place when the circuit board 60 is assembled in place in the first mounting cavity 83. The assembly of the shielding frame 90 and the circuit board 60 is not required to be performed separately in the process of assembling the electronic valve, thereby simplifying the assembly process of the electronic valve, reducing the assembly difficulty, cost and time consumption of the electronic valve, and protecting the magnetic sensor 40 from being damaged by the shielding frame 90 during the assembly of the electronic valve.

[0158] In combination Figures 31-35 In the embodiment shown, the circuit board 60 is sleeved with the wall of the second mounting cavity 86 through the through hole 61, and the circuit board 60 abuts against and is stably held by the abutment 84. When the circuit board 60 is assembled in place in the first mounting cavity 83, the magnetic sensor 40, the circuit board 60 and the shielding frame 90 are integrally assembled in place in the first mounting cavity 83 as an assembly unit. The shielding frame 90 can prevent the abutment 84 from accidentally contacting the magnetic sensor 40, and can also prevent the wall of the second mounting cavity 86 from accidentally contacting the magnetic sensor 40, thereby preventing the magnetic sensor 40 from being damaged and causing the motor structure to be scrapped.

[0159] In addition, the structure of the shielding frame 90 is miniaturized. The size of the shielding frame 90 only needs to cover the magnetic sensor 40 to block the leakage magnetic field of the coil, and the shielding frame 90 does not need to cover other components on the circuit board 60. Therefore, the distance between the cover plate 91 of the shielding frame 90 and the circuit board 60 can be reduced, the axial size of the rotor assembly 30 can be shortened, and the structure of the motor and the electronic valve can be miniaturized. According to the technical scheme of the present application, the distance from the magnetic sensor to the end of the coil can be reduced to 0.5㎜~2㎜.

[0160] As shown in Figures 31-35 In some embodiments, the side of the circuit board 60 relative to the side of the excitation coil 50 is the first side 62, and the other side of the circuit board 60 relative to the excitation coil 50 is the 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 arranged on the first side 62, and at least the second side 63 is provided with an electrical component 70. The electrical component 70 arranged on the first side 62 includes a magnetic working element 71. Specifically, the first side 62 includes a magnetic shielding surface domain and a magnetic receiving surface domain. The magnetic sensor 40 is arranged on the magnetic shielding surface domain, and the magnetic working element 71 is arranged on the magnetic receiving surface domain. The area of the shielding frame 90 in the orthographic projection of the first side 62 is the magnetic shielding surface domain, and the area of the first side 62 outside the magnetic shielding surface domain is the magnetic receiving surface domain.

[0161] Specifically, referring to Figures 31-32 ​The shielding frame 90 comprises a cover plate 91 and a flange 92 connected by bending, the cover plate 91 is arranged spaced apart from the circuit board 60, for example, a preset accommodation gap 93 for accommodating the magnetic sensor 40 is formed between the cover plate 91 and the first side 62, 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 observing the motor structure in a direction of 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 cannot be seen. Optionally, the magnetic sensor 40 is a magnetoresistive sensor, the magnetic sensor 40 is attached to the magnetic shielding surface, and the pins of the magnetic sensor 40 are welded and fixed to the pads on the circuit board 60 to realize electrical connection between the magnetic sensor 40 and the circuit board 60.

[0162] In this way, the magnetic shielding effect of the shielding frame 90 on the magnetic sensor 40 is significant, the possibility of the magnetic field of the magnetic leakage of the excitation coil 50 acting on the magnetic sensor 40 is reduced, and the magnetic sensor 40 is more difficult to sense the magnetic leakage field; a touch-proof gap is formed between the cover plate 91 and the magnetic sensor 40, the height of the touch-proof gap is the difference between the height of the preset accommodation gap 93 and the thickness of the magnetic sensor 40, the touch-proof 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 an external support is not needed 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 the motor structure is not easy to disassemble.

[0163] Referring again to Figure 32 The number of the flanges 92 is two, and the two flanges 92 are arranged at two ends of the same side of the cover plate 91, each flange 92 comprises a support edge 921 and a pasting edge 922, the support edge 921 is connected to the end edge of the cover plate 91 by bending and protrudes towards the circuit board 60, and the pasting edge 922 is connected to the end of the support edge 921 away from the cover plate 91 by bending, and the first side 62 of the circuit board 60 is surface-pasted and fixed with the pasting edge 922.

[0164] Optionally, the first side 62 and the pasting edge 922 are welded and fixed. In this way, the shielding frame 90 is stably and reliably pasted and fixed with the circuit board 60, and the two are not easy to separate, so that the motor structure is not easy to disassemble.

[0165] As a preferred, the first side 62 and the pasting edge 922 are welded and fixed by SMT surface mount technology, the cover plate 91 and the flange 92 are an integral molded structure that cannot be disassembled, the cover plate 91 and the flange 92 are obtained by bending and deforming a single independent plate, the shielding frame 90 is simpler to form and lighter in structure, and the cost of the motor structure and the electronic valve is further reduced.

[0166] In some other embodiments, the first side 62 is adhered to the plate edge 922, or the circuit board 60 is further provided with a slot, and the plate edge 922 is inserted into the slot to be fixedly connected to 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 adhesion, splicing, fitting, or the like. The shielding frame 90 can also be an arc-shaped bent plate. At least one end of the shielding frame 90 is fixedly connected to the circuit board 60, and a space for accommodating the magnetic sensor 40 is formed between the shielding frame 90 and the circuit board 60.

[0168] In Figures 31-35 In the embodiment shown, the cover plate 91 is a rectangular plate structure. The orthogonal projection of the cover plate 91 on the first side 62 of the circuit board 60 is a magnetic shielding surface domain. The magnetic shielding surface domain is a rectangular surface domain. That is, the shielding frame 90 only covers one rectangular surface domain of the first side 62 of the circuit board 60. The part of the first side 62 not covered by the shielding frame 90 forms a magnetic receiving surface domain for disposing the magnetic working element 71.

[0169] In this way, while ensuring that the magnetic field leaked by the excitation coil 50 does not affect the magnetic sensor 40, the magnetic working element 71 is not covered by the shielding frame 90, and the magnetic working element 71 is still in the magnetic field environment of the excitation coil 50 and normally works under the action of the magnetic field of the excitation coil 50, meeting the electromagnetic compatibility requirements of the motor structure. Moreover, the size of the shielding frame 90 is limited to the greatest extent, the area occupied by the shielding frame 90 on the first side 62 is reduced, and a larger magnetic receiving surface domain is obtained to deploy more magnetic working elements 71.

[0170] Further, 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 avoiding opening. In Figures 31-35 In the embodiment shown, the circuit board 60 is approximately a rectangular plate with rounded corners. As described above, the avoiding opening is a through hole 61 provided in the circuit board 60. The shielding frame 90 does not protrude from the outer edge of the circuit board 60 with rounded corners and does not protrude from the edge of the through hole 61. The edge of the through hole 61 is the edge of the avoiding opening. In this way, during the process of installing the circuit board 60 into the first mounting cavity 83, the shell wall of the installation shell 81 is not easily interfered with the shielding frame 90, and the second mounting cavity 86 does not interfere with the shielding frame 90 during the process of passing through the through hole 61. Therefore, the shielding frame 90 can be prevented from shaking or even falling off due to contact with the shell wall of the installation shell 81 or the cavity wall of the second mounting cavity 86.

[0171] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered to fall within the scope of the present specification.

[0172] Those skilled in the art should know that the above-described embodiments are only used to illustrate the present application, but not as a limitation to the present application, and as long as the changes and variations of the above-described embodiments are within the spirit of the present application, they should be considered to fall within the scope of the present application.

Claims

1. An electronic valve, characterized in that, It includes a valve body (10), a valve core (20), a stator assembly, a rotor assembly (30), and an electrical connection 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 driven and connected to the valve core (20), the stator assembly includes an excitation coil (50), and the rotor assembly (30) and the excitation coil (50) are collinear; The magnetic sensor (40) senses the change in the magnetic field of the rotor assembly (30) and generates a sensing signal. The magnetic sensing surface of the magnetic sensor (40) has point A. A circle B is drawn with the distance R1 from point A to the axis of the rotor assembly (30) as the radius. The center of the circle B is point C located on the axis of the rotor assembly (30). The magnetic field strength of the excitation coil (50) at point A can be decomposed into multiple vectors, one of which is B1, the direction of B1 is H2, and the direction of 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 as described in claim 1, characterized in that, The decomposed vector of the magnetic field strength of the excitation coil (50) at 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°~135° with H1.

3. The electronic valve as described in claim 2, characterized in that, The magnetic sensing direction of the magnetic sensor (40) is 0° with H2, and the magnetic sensing direction of the magnetic sensor (40) is 90° with H1.

4. The electronic valve as described in claim 1, characterized in that, The magnetic field strength of the rotor assembly (30) at point A can be decomposed into multiple vectors, one of which is B3. The direction of B3 is H4, and H4 is the tangent direction of circle B at point A. The value of B3 is higher than the value of B1.

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

6. The electronic valve as described in claim 5, characterized in that, Both the first magnetically sensitive surface (411) and the second magnetically sensitive surface (412) are perpendicular to the circuit board (60).

7. The electronic valve as described in claim 1, characterized in that, The circuit board (60) has a through hole (61) through which the rotor assembly (30) passes along the axial direction, and the through hole (61), the rotor assembly (30) and the excitation coil (50) are coaxial; Draw a circle with point C as the center and radius R2 less than R1 to obtain circle D. The radius R2 is the shortest distance from point C on the axis of the rotor assembly (30) to the edge of the through hole (61). The magnetic sensor (40) is located on the outer periphery of circle D.

8. The electronic valve as described in claim 1, characterized in that, The stator assembly further includes a housing comprising a first mounting cavity (83) and a second mounting cavity (86) isolated from each other, wherein 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 as claimed in claim 1, characterized in that, The stator assembly further includes a housing comprising a first mounting cavity (83) and a second mounting cavity (86) isolated from each other, at least a portion of the circuit board (60) being located in the first mounting cavity (83), and the rotor assembly (30) being located in the second mounting cavity (86), the first mounting cavity (83) and the second mounting cavity (86) being arranged radially along the excitation coil (50).

10. The electronic valve as described in claim 9, characterized in that, The circuit board (60) 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 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 as claimed in claim 1, characterized in that, The circuit board (60) is disposed on the outer periphery of the rotor assembly (30), and the circuit board (60) and the excitation coil (50) are arranged along the axial direction of the rotor assembly (30); and / or, the magnetic sensor (40) is a magnetoresistive sensor, the magnetoresistive sensor has pins (42), and the pins (42) are attached to the circuit board (60).

12. The electronic valve as claimed in claim 11, characterized in that, The magnetic sensor (40) is located on the side of the circuit board (60) near the excitation coil (50), and electrical components (70) are arranged on the side of the circuit board (60) opposite to the excitation coil (50).

13. The electronic valve as claimed in claim 1, characterized in that, The electronic valve also includes a shielding frame (90) fixedly connected to the circuit board (60), at least a portion of which is located on the side of the magnetic sensor (40) relatively close to the excitation coil (50) and covers the magnetic sensor (40).

14. The electronic valve as described in claim 13, characterized in that, The shielding frame (90) includes a cover plate (91) spaced from the circuit board (60) to accommodate the magnetic sensor (40), the edge of the magnetic sensor (40) not protruding beyond the edge of the cover plate (91).

15. The electronic valve as described in claim 14, characterized in that, The shielding frame (90) further includes a flange (92) that is bent and connected to the cover plate (91). The flange (92) includes a mounting edge (922) that forms a surface fit with the circuit board (60). The mounting edge (922) is welded and fixed to the circuit board (60); or, the mounting edge (922) is bonded and fixed to the circuit board (60); or, the mounting edge (922) is inserted and fixed to the circuit board (60).

16. The electronic valve as claimed in claim 13, characterized in that, The shielding frame (90) is an arc-shaped curved plate. At least one end of the shielding frame (90) is fixedly connected to the circuit board (60). There is a gap 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, characterized in that, The circuit board (60) has a clearance through which the rotor assembly (30) extends, and the shielding frame (90) does not protrude beyond the outer periphery of the circuit board (60) and does not protrude beyond the edge of the clearance; and / or, The circuit board (60) includes a magnetic shielding surface region and a magnetic receiving surface region on the side of the circuit board (60) that is relatively close to the excitation coil (50). The area of ​​the projection area of ​​the shielding frame (90) on the side of the circuit board (60) that is relatively close to the excitation coil (50) is the magnetic shielding surface region. The area on the circuit board (60) that is relatively close to the excitation coil (50) and outside the magnetic isolation surface is the magnetized surface, and the magnetized surface is provided with a magnetic working element (71).

Images