Position sensor stator, position sensor, position sensor system, motor, electric assembly and vehicle

Abstract

The utility model discloses a position sensor stator, a position sensor, a position sensor system, a motor, an electric assembly and a vehicle. The position sensor stator comprises a circuit board, a transmitting coil and a receiving coil. The transmitting coil is arranged on the circuit board. The receiving coil is arranged on the circuit board, the receiving coil and the transmitting coil are located on different layers of the circuit board, and the receiving coil comprises an outermost end and an innermost end which are opposite in the radial direction; in the projection on the circuit board, the transmitting coil is arranged between the outermost end of the receiving coil and the innermost end of the receiving coil, the receiving coil protrudes in the radial direction relative to the transmitting coil, and the protruding part is in an arc shape. According to the position sensor stator, under the condition that the sizes of the transmitting coils are the same, the size of the receiving coil in the embodiment is larger, so that the receiving coil can generate larger induced voltage, the working stability and reliability of the position sensor stator can be ensured, and the working precision of the position sensor is improved.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and more specifically, to a position sensor stator, a position sensor, a position sensor system, a motor, an electric assembly and a vehicle. Background Art

[0002] As the requirements for position detection in various fields continue to increase, position sensors (such as inductive position sensors) manufactured using electromagnetic principles have been widely used. In the relevant technology, the inductive position sensor includes a rotor and a stator. The stator includes a circuit board and an excitation coil and an induction coil arranged on the circuit board. The excitation coil is located outside the induction coil. When the excitation coil is energized, the induction coil can output an induced voltage to an external device, and the external device analyzes the induced voltage to obtain the relative position of the rotor.

[0003] However, since the excitation coil is located outside the induction coil, when the size of the excitation coil is constant, the size of the induction coil is smaller, which will result in a smaller induced voltage that the induction coil can generate when the excitation coil is energized, resulting in a smaller induced voltage received by the external device or even no induced voltage, affecting the stability and reliability of the position sensor stator. Utility Model Content

[0004] Embodiments of the present application provide a position sensor stator, a position sensor, a position sensor system, a motor, an electric assembly, and a vehicle.

[0005] The position sensor stator of the embodiment of the present application includes a circuit board, a transmitting coil and a receiving coil. The transmitting coil is arranged on the circuit board. The receiving coil is arranged on the circuit board and is located on a different layer of the circuit board from the transmitting coil. The receiving coil includes an outermost end and an innermost end opposite to each other in the radial direction. In the projection on the circuit board, the transmitting coil is arranged between the outermost end of the receiving coil and the innermost end of the receiving coil. The receiving coil protrudes in the radial direction relative to the transmitting coil, and the protruding part is arc-shaped.

[0006] In some embodiments, in the projection on the circuit board, a portion of any receiving coil protruding along the radial direction relative to the transmitting coil intersects with the outermost circle of the transmitting coil and forms two intersection points, and a portion of the receiving coil between the two intersection points is a curve.

[0007] In some embodiments, a portion of the receiving coil between the two intersection points protrudes in a direction away from the transmitting coil.

[0008] In some embodiments, the receiving coil includes multiple induction coils, each of the induction coils includes a first coil and a second coil connected in series, the first coil bends and extends in a clockwise direction, and the second coil bends and extends in a counterclockwise direction, the first coil and the second coil each include N convex points and N concave points, the convex points are located at the outermost end of the receiving coil, and the concave points are located at the innermost end of the receiving coil; and the first coil and the second coil are offset by a certain angle in the circumferential direction.

[0009] In some embodiments, the convex points of the first coil correspond one-to-one with the concave points of the second coil in the radial direction, and the concave points of the first coil correspond one-to-one with the convex points of the second coil in the radial direction; in the first coil, the portion of the first coil between adjacent convex points and concave points is a curve; in the second coil, the portion of the second coil between adjacent convex points and concave points is a curve.

[0010] In some embodiments, the circuit board includes a plurality of stacked wiring layers; the circuit board is provided with a plurality of through holes corresponding to the protrusions and the concave points, and the through holes are used to electrically connect the induction coils between different wiring layers.

[0011] In some embodiments, the distance between any two adjacent through holes is D, wherein D≥0.15 mm.

[0012] In some embodiments, the number of through holes corresponding to the concave points is n, and Wherein, d1 is the length of the line between the two points on the innermost end of the receiving coil that are the farthest apart, S is the diameter of the through hole, and n is an integer.

[0013] In some embodiments, in the projection on the circuit board, the first coil and the second coil intersect to form a plurality of magnetic flux zones, each of the magnetic flux zones being surrounded by a portion of the first coil and a portion of the second coil between two intersection points formed by the intersection of the first coil and the second coil.

[0014] In some embodiments, two adjacent induction coils in each group of receiving coils are staggered. Wherein, N is the number of protrusions of the first coil, and M is the number of the induction coils in each group of the receiving coils.

[0015] In some embodiments, the receiving coil is a quasi-sine coil, and the transmitting coil includes a toroidal coil or a quasi-toroidal coil; the receiving coil is coaxially arranged with the transmitting coil.

[0016] In some embodiments, the receiving coil includes a first group of receiving coils and a second group of receiving coils, the first group of receiving coils including an outermost end and an innermost end opposite to each other in the radial direction; in the projection on the circuit board, the second group of receiving coils is disposed between the outermost end of the first group of receiving coils and the innermost end of the first group of receiving coils.

[0017] The position sensor of the embodiment of the present application includes the position sensor stator and the position sensor rotor described in any one of the above embodiments. The position sensor rotor is spaced apart from the circuit board and can rotate relative to the circuit board.

[0018] In certain embodiments, the position sensor rotor includes a plurality of conductive portions, and an outermost end of the position sensor rotor covers an outermost end of the receiving coil.

[0019] In some embodiments, the number of the conductive parts is Q, and Q=N, wherein Q is an integer, and N is the number of protrusions on the first coil of the induction coil of the receiving coil.

[0020] The position sensor system of the embodiment of the present application comprises the position sensor and the integrated circuit described in any one of the above embodiments. The integrated circuit is arranged on the circuit board and is electrically connected to the position sensor.

[0021] The motor according to the embodiment of the present application includes a rotating shaft and the position sensor described in the above embodiment. The position sensor rotor of the position sensor is sleeved on the rotating shaft and can rotate together with the rotating shaft.

[0022] The electric assembly of the embodiment of the present application includes the motor described in the above embodiment.

[0023] The vehicle according to the embodiment of the present application includes the electric assembly described in the above embodiment.

[0024] In the position sensor stator, position sensor, position sensor system, motor, electric assembly and vehicle of the embodiments of the present application, in the projection on the circuit board, the transmitting coil is arranged between the outermost end of the receiving coil and the innermost end of the receiving coil. Therefore, compared with the traditional position sensor stator in which the transmitting coil is located outside the receiving coil, when the size of the transmitting coil is the same, the size of the receiving coil in this embodiment is larger. Therefore, the receiving coil can generate a larger induced voltage, thereby ensuring the stability and reliability of the operation of the position sensor stator and improving the working accuracy of the position sensor.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 is a schematic diagram of the structure of a position sensor in some embodiments of the present application;

[0028] Figure 2 yes Figure 1 A schematic diagram of the structure of an induction coil in a receiving coil in a position sensor stator of the position sensor shown;

[0029] Figure 3 It is a schematic diagram of the structure of a conventional position sensor and a schematic diagram of the AC waveform generated by a receiving coil in a position sensor stator of the corresponding position sensor;

[0030] Figure 4 It is a schematic diagram of the AC waveform generated in the transmitting coil in the position sensor stator of a traditional position sensor;

[0031] Figure 5 yes Figure 1 A schematic diagram of an alternating current waveform generated by a transmitting coil in a position sensor stator of the position sensor shown;

[0032] Figure 6 yes Figure 1 A schematic diagram of a waveform of an induced voltage generated by a receiving coil in a position sensor stator of the position sensor shown;

[0033] Figure 7 is a schematic diagram of the structure of a position sensor in some other embodiments of the present application;

[0034] Figure 8 yes Figure 7 A schematic diagram of a waveform of an induced voltage generated by a first group of receiving coils in a position sensor stator of the position sensor shown;

[0035] Fig. 9 yes Figure 7 A schematic diagram of a waveform of an induced voltage generated by a second group of receiving coils in a position sensor stator of the position sensor shown;

[0036] Fig.10 is a schematic diagram of the structure of a motor in some embodiments of the present application;

[0037] Fig.11 It is a schematic diagram of the structure of a vehicle of certain embodiments of the present application.

[0038] Description of main component symbols:

[0039] Vehicle 5000; Electric assembly 4000; Motor 3000;

[0040] Position sensor system 1000; Rotating axis 2000;

[0041] Position sensor 100; integrated circuit 200;

[0042] Position sensor stator 10; position sensor rotor 20, contour shape 21, mounting portion 23, conductive portion 25, radial side 251, circumferential side 253;

[0043] Circuit board 11, through hole 111;

[0044] Transmitting coil 15, fourth outline shape 151, third outline shape 153, first excitation coil 155, second excitation coil 157;

[0045] Receiving coil 17, second contour shape 171, first contour shape 173, induction coil 175, convex point 1751, concave point 1753, first coil 1755, second coil 1757, magnetic flux area 1758, intersection 1759, first group of receiving coils 177, second group of receiving coils 179. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0047] In the description of the present application, it should be understood that the terms "center", "length", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] See also Figure 1 The position sensor 100 according to the embodiment of the present application includes a position sensor stator 10 and a position sensor rotor 20 .

[0052] Among them, the position sensor rotor 20 is a component that can generate a magnetic field, and the magnetic field can act on other structures. In the embodiment of the present application, the position sensor rotor 20 includes a mounting portion 23 and a plurality of conductive portions 25, and the plurality of conductive portions 25 radially extend from the outer periphery of the mounting portion 23. Specifically, when an external magnetic field acts on the position sensor rotor 20, eddy currents can be generated inside the conductive portion 25, and the eddy currents flow along the periphery of the conductive portion 25 and generate a magnetic field (secondary magnetic field), and the secondary magnetic field can act on other structures (such as the receiving coil 17 described below) so that the other structures can generate an induced voltage.

[0053] In some embodiments, the center of the mounting portion 23 coincides with the central axis of the position sensor rotor 20, the multiple conductive portions 25 are of the same size and shape, and the multiple conductive portions 25 are evenly spaced and arranged on the outer periphery of the mounting portion 23. Fig.10 When the mounting portion 23 is sleeved on the rotating shaft 2000 of the motor 3000 , the central axis of the position sensor rotor 20 coincides with the central axis of the rotating shaft 2000 , and the position sensor rotor 20 can rotate together with the rotating shaft 2000 .

[0054] In some embodiments, the position sensor rotor 20 may be made of metal materials, including but not limited to copper, iron, steel, nickel or cobalt, etc., that is, the mounting portion 23 and the plurality of conductive portions 25 may be made of metal materials. It is understood that in other embodiments, the plurality of conductive portions 25 may be made of magnetic materials, including but not limited to copper, iron, steel, nickel or cobalt, etc.; the mounting portion 23 is made of non-magnetic materials (such as plastic or aluminum, etc.), thereby reducing or even avoiding the interference of the mounting portion 23 with the magnetic field generated by the conductive portion 25.

[0055] Since the position sensor 100 of the present embodiment includes the position sensor stator 10, it can be understood that the position sensor 100 also includes at least the same beneficial effects as the position sensor stator 10. Therefore, for the beneficial effects of the position sensor 100, please refer to the beneficial effects of the position sensor stator 10 described below.

[0056] Please continue reading Figure 1 The position sensor stator 10 of the embodiment of the present application includes a circuit board 11, a transmitting coil 15 and a receiving coil 17. The transmitting coil 15 is arranged on the circuit board 11. The receiving coil 17 is arranged on the circuit board 11 and is located on a different layer of the circuit board 11 from the transmitting coil 15. The receiving coil 17 includes an outermost end and an innermost end opposite to each other in the radial direction; in the projection on the circuit board 11, the transmitting coil 15 is arranged between the outermost end of the receiving coil 17 and the innermost end of the receiving coil 17, and the receiving coil 17 protrudes radially relative to the transmitting coil 15, and the protruding part is in an arc shape.

[0057] In the position sensor stator 10 of the embodiment of the present application, in the projection on the circuit board 11, the transmitting coil 15 is arranged between the outermost end of the receiving coil 17 and the innermost end of the receiving coil 17. Therefore, compared with the traditional position sensor stator in which the transmitting coil is located outside the receiving coil, when the size of the transmitting coil 15 is the same, the size of the receiving coil 17 in this embodiment is larger. Therefore, the coupling ability between the receiving coil 17 and the position sensor rotor 20 is stronger, thereby increasing the induced voltage generated by the receiving coil 17, thereby ensuring the stability and reliability of the operation of the position sensor stator 10, and improving the working accuracy of the position sensor 100.

[0058] In addition, the receiving coil 17 protrudes radially relative to the transmitting coil 15, and the protruding portion is arc-shaped, thereby ensuring the curvature of the receiving coil 17. Compared with the straight-line receiving coil 17, the receiving coil 17 in this embodiment is not easy to reflect the high-frequency signal in the transmitting coil 15, thereby reducing or even avoiding the electromagnetic interference (EMI) problem, thereby improving the working accuracy of the position sensor 100.

[0059] Specifically, in some embodiments, the printed circuit board 11 (PCB) is a component used to support and connect electronic components. The printed circuit board 11 can be a printed circuit board made of aluminum, steel or a printed copper layer. The printed circuit board 11 includes a single-sided board, a double-sided board and a multi-layer circuit board. In the present application, the printed circuit board 11 is a multi-layer circuit board.

[0060] Furthermore, in some embodiments, the circuit board 11 includes a plurality of stacked wiring layers. The receiving coil 17 and the transmitting coil 15 are located on different layers of the circuit board 11, that is, the transmitting coil 15 and the receiving coil 17 are respectively arranged on different wiring layers, thereby, on the one hand, being able to avoid the transmitting coil 15 and the receiving coil 17 from directly contacting each other to cause a short circuit, thereby improving the working stability of the position sensor stator 10; on the other hand, being able to achieve electromagnetic interference isolation, reduce the electromagnetic interference between the transmitting coil 15 and the receiving coil 17, and improve the working accuracy of the position sensor stator 10 and the position sensor 100. It should be noted that, in some embodiments, an insulating layer is provided between two adjacent wiring layers, and the provision of the insulating layer can achieve electrical isolation between different wiring layers, prevent short circuits and electrical interference, and improve the working stability and reliability of the circuit board 11. Among them, the insulating layer can be made of at least one of insulating materials such as plastic, epoxy resin, organic glass fiber and ceramic.

[0061] In some embodiments, the receiving coil 17 is a quasi-sine coil, and the transmitting coil 15 includes a toroidal coil or a quasi-toroidal coil. Specifically, when the receiving coil 17 is a quasi-sine coil, the shape of the projection of the receiving coil 17 in the length and width plane of the circuit board 11 is similar to a sine function waveform; when the transmitting coil 15 includes a toroidal coil, the shape of the projection of the transmitting coil 15 in the length and width plane of the circuit board 11 is a ring. It should be noted that, in some embodiments, the length and width plane of the circuit board 11 may be: a plane on the circuit board 11 that is perpendicular to the central axis of the position sensor rotor 20.

[0062] Furthermore, in some embodiments, the receiving coil 17 is coaxially arranged with the transmitting coil 15, that is, in the projection on the circuit board 11, the central axis (center) of the receiving coil 17 coincides with the central axis (center) of the transmitting coil 15. Thus, on the one hand, the magnetic field generated by the transmitting coil 15 acts on the receiving coil 17 as much as possible, thereby ensuring that the receiving coil 17 can generate a large induced voltage, thereby improving the working stability and reliability of the position sensor stator 10; on the other hand, it can facilitate the installation of the receiving coil 17 and the transmitting coil 15 on the circuit board 11, thereby improving the assembly efficiency of the position sensor stator 10.

[0063] In some embodiments, the first contour shape 173 of the projection of the innermost end of the receiving coil 17 in the length and width plane of the circuit board 11 and the second contour shape 171 of the projection of the outermost end of the receiving coil 17 in the length and width plane of the circuit board 11 are both circular; the transmitting coil 15 includes an outermost end and an innermost end opposite to each other in the radial direction, and the third contour shape 153 of the projection of the innermost end of the transmitting coil 15 in the length and width plane of the circuit board 11 and the fourth contour shape 151 of the projection of the outermost end of the transmitting coil 15 in the length and width plane of the circuit board 11 are both circular, wherein the centers of the first contour shape, the second contour shape, the third contour shape and the fourth contour shape all coincide with the center of the mounting portion 23. It should be noted that, in some embodiments, the radial direction may be: the radial direction of any one of the first contour shape, the second contour shape, the third contour shape and the fourth contour shape.

[0064] Specifically, the transmitting coil 15 is arranged between the outermost end of the receiving coil 17 and the innermost end of the receiving coil 17, that is, the diameter of the fourth contour shape 151 is smaller than the diameter of the second contour shape 171, and the diameter of the third contour shape 153 is smaller than the diameter of the first contour shape 173. Therefore, compared with the traditional position sensor in which the transmitting coil is located outside the receiving coil, when the diameter of the transmitting coil 15 is the same, the size of the receiving coil 17 in this embodiment is larger. Therefore, the coupling ability between the receiving coil 17 and the position sensor rotor 20 is stronger, thereby increasing the induced voltage generated by the receiving coil 17, thereby ensuring the stability and reliability of the operation of the position sensor stator 10, and improving the working accuracy of the position sensor 100.

[0065] It should be noted that the diameter of the first contour shape 173 may be: the length of a straight line with two opposite ends located on the first contour shape 173 and passing through the center of the first contour shape 173, wherein the diameter of the first contour shape 173 is 2*r1; the diameter of the second contour shape 171 may be: the length of a straight line with two opposite ends located on the second contour shape 171 and passing through the center of the second contour shape 171, wherein the diameter of the second contour shape 171 is 2*r2; the diameter of the third contour shape 153 may be: the length of a straight line with two opposite ends located on the third contour shape 153 and passing through the center of the third contour shape 153, wherein the diameter of the third contour shape 153 is 2*r3; the diameter of the fourth contour shape 151 may be: the length of a straight line with two opposite ends located on the fourth contour shape 151 and passing through the center of the fourth contour shape 151, wherein the diameter of the fourth contour shape 151 is 2*r4.

[0066] In some embodiments, the outermost end of the position sensor rotor 20 covers the outermost end of the receiving coil 17, that is, the position sensor rotor 20 over-covers the receiving coil 17; or, the position sensor rotor 20 just covers the receiving coil 17. Wherein, in the case where the position sensor rotor 20 over-covers the receiving coil 17, the size of the outline shape of the projection of the outermost end of the position sensor rotor 20 in the length and width plane of the circuit board 11 (hereinafter referred to as "the fifth outline shape 21") is greater than the size (diameter) of the second outline shape 171; in the case where the position sensor rotor 20 just covers the receiving coil 17, the size of the fifth outline shape 21 is equal to the size of the second outline shape 171. It should be noted that, in some embodiments, the size of the fifth outline shape 21 can be: the length of a straight line with two opposite ends located on the fifth outline shape 21 and passing through the center of the mounting portion 23, wherein the size of the fifth outline shape 21 is 2*r2. This application only takes the example that the position sensor rotor 20 just covers the receiving coil 17 for explanation.

[0067] In some embodiments, in the projection on the circuit board 11, the radially protruding portion of any receiving coil 17 relative to the transmitting coil 15 intersects with the outermost circle of the transmitting coil 15 and forms two intersections, and the portion of the receiving coil 17 between the two intersections is a curve.

[0068] Specifically, in some embodiments, in the projection on the circuit board 11, the portion of the receiving coil 17 that radially extends beyond the fourth contour shape 151 intersects with the fourth contour shape 151 and forms two intersections, and the portion of the receiving coil 17 between the two intersections is a curve, thus, compared with the portion of the receiving coil 17 that radially extends beyond the fourth contour shape 151 being a straight line, the receiving coil 17 in this embodiment is not easy to reflect the high-frequency signal in the transmitting coil 15, thereby reducing or even avoiding the problem of electromagnetic interference (EMI), thereby improving the working accuracy of the position sensor 100. It should be noted that, in some embodiments, the sinusoidal convex hull includes a plurality of sinusoidal convex hulls, each of which includes sinusoidal convex points, and each of which intersects with the outermost end of the transmitting coil 15 to form two intersections.

[0069] Furthermore, in some embodiments, part of the receiving coil 17 between the two intersection points protrudes in a direction away from the transmitting coil 15, so that in the projection on the circuit board 11, the size of the receiving coil 17 is larger, thereby further improving the coupling ability between the receiving coil 17 and the position sensor rotor 20, increasing the induced voltage generated by the receiving coil 17, and thus ensuring the stability and reliability of the operation of the position sensor stator 10, thereby improving the working accuracy of the position sensor 100.

[0070] Please continue reading Figure 1 In some embodiments, the transmitting coil 15 may include an excitation coil. In other embodiments, the transmitting coil 15 may include multiple excitation coils, and the multiple excitation coils are arranged in different routing layers. Among them, the transmitting coil 15 is configured so that when a high-frequency AC signal is passed through the transmitting coil 15, the transmitting coil 15 can generate an alternating magnetic field. It should be noted that the frequency of the high-frequency AC signal may be [2.5MHz, 5.0MHz]. In some embodiments, the frequency of the high-frequency AC signal may be any one of 2.5MHz, 3.0MHz, 3.5MHz, 4.0MHz, 4.5MHz and 5.0MHz, or any value between any two values.

[0071] Specifically, in some embodiments, the transmitting coil 15 may include a first excitation coil 155 and a second excitation coil 157 connected to each other, and the first excitation coil 155 and the second excitation coil 157 are disposed in different routing layers.

[0072] More specifically, the transmitting coil 15 can be wound by a wire and has a first excitation coil 155 and a second excitation coil 157 that do not contact each other. In other words, the first excitation coil 155 and the second excitation coil 157 are connected in series, and the positive port of the transmitting coil 15 and the negative port of the transmitting coil 15 are respectively located on the first excitation coil 155 and the second excitation coil 157. Therefore, the positive port of the transmitting coil 15 and the negative port of the transmitting coil 15 are arranged in layers, so that the line connection can be guaranteed to be stable and short circuit can be avoided. In addition, compared with the transmitting coil 15 including only one of the first excitation coil 155 and the second excitation coil 157, the transmitting coil 15 includes both the first excitation coil 155 and the second excitation coil 157, and has a larger magnetic field, so that the receiving coil 17 can generate a larger induced voltage. It should be noted that in some embodiments, the first excitation coil 155 and the second excitation coil 157 can both include multiple turns.

[0073] In some embodiments, the transmitting coil 15 includes a first excitation coil 155 and a second excitation coil 157 connected to each other, and the receiving coil 17 can be arranged between the first excitation coil 155 and the second excitation coil 157 in the thickness direction of the circuit board 11. For example, when the circuit board 11 includes a first wiring layer, a second wiring layer, a third wiring layer, and a fourth wiring layer stacked, the first excitation coil 155 and the second excitation coil 157 can be arranged in the first wiring layer and the fourth wiring layer, respectively, and the receiving coil 17 can be arranged in the second wiring layer and the third wiring layer. In other embodiments, in the thickness direction of the circuit board 11, when the transmitting coil 15 includes a first excitation coil 155 and a second excitation coil 157 connected to each other, the first excitation coil 155 and the second excitation coil 157 can be arranged on the same side of the transmitting coil 15. For example, the first excitation coil 155 and the second excitation coil 157 can be arranged in the first wiring layer and the second wiring layer, respectively, and the receiving coil 17 is arranged in the third wiring layer and the fourth wiring layer.

[0074] In some embodiments, the receiving coil 17 includes a plurality of induction coils 175. The receiving coil 17 is configured to generate an induced voltage signal under the action of the secondary magnetic field generated by the position sensor rotor 20. It should be noted that, in some embodiments, some of the plurality of induction coils 175 can generate a sine signal, and another part can generate a cosine signal, and the number relationship between the induction coils 175 generating the sine signal and the induction coils 175 generating the cosine signal is one-to-one. For example, in the case where each group of receiving coils 17 includes two induction coils 175, one of the induction coils 175 can generate a sine signal, and the other induction coil 175 can generate a cosine signal.

[0075] In some embodiments, multiple induction coils 175 may be disposed on different routing layers, and the induction coils 175 on the same routing layer do not cross each other, thereby preventing the induction coils 175 from contacting each other and causing a short circuit, thereby ensuring the normal operation of the position sensor stator 10.

[0076] For further information, see Figure 1 and Figure 2 In some embodiments, each induction coil 175 includes a first coil 1755 and a second coil 1757 connected in series, the first coil 1755 bends and extends in a clockwise direction, the second coil 1757 bends and extends in a counterclockwise direction, and the first coil 1755 and the second coil 1757 are offset by a certain angle in the circumferential direction.

[0077] Specifically, in some embodiments, the first coil 1755 includes a head end and a tail end, and the second coil 1757 also includes a head end and a tail end, the head end of the first coil 1755 is connected to the tail end of the second coil 1757, and the tail end of the first coil 1755 is connected to the head end of the second coil 1757. The first coil 1755 bends and extends on different wiring layers in a clockwise direction, and the second coil 1757 bends and extends on different wiring layers in a counterclockwise direction, and the first coil 1755 and the second coil 1757 have the same orthographic projection shape on a plane perpendicular to the central axis of the position sensor rotor 20. It can be understood that in other embodiments, the first coil 1755 can also be bent and extended in the counterclockwise direction, and the second coil 1757 can be bent and extended in the clockwise direction.

[0078] In addition, if the first coil 1755 is bent and extended on the second routing layer and the third routing layer in a clockwise direction, the second coil 1757 is bent and extended on the second routing layer and the third routing layer in a counterclockwise direction, and the first coil 1755 and the second coil 1757 located on the second routing layer do not cross each other, and the first coil 1755 and the second coil 1757 located on the third routing layer also do not cross each other.

[0079] In some embodiments, the first coil 1755 and the second coil 1757 each include N convex points 1751 and N concave points 1753, the convex points 1751 are located at the outermost end of the receiving coil 17, and the concave points 1753 are located at the innermost end of the receiving coil 17. Specifically, 2N convex points 1751 are formed on the end of each induction coil 175 farthest from the mounting portion 23, and 2N concave points 1753 are formed on the end of each induction coil 175 closest to the mounting portion 23. It can be understood that the first contour shape 173 can be formed by smoothly connecting the projections of the concave points 1753 in the length and width plane of the circuit board 11, and the second contour shape 171 can be formed by smoothly connecting the projections of the convex points 1751 in the length and width plane of the circuit board 11.

[0080] Further, in some embodiments, N may be the same as the number Q of the conductive portions 25 of the position sensor rotor 20. In this case, the angle between the adjacent two-pole conductive portions 25 is The angle of each conductive portion 25 is Therefore, when the position sensor rotor 20 rotates relative to the circuit board 11 , the conductive portion 25 can cover a portion of the receiving coil 17 , so that the induced voltage output by the receiving coil 17 changes.

[0081] In some embodiments, the convex points of the first coil 1755 correspond to the concave points of the second coil 1757 in a radial direction, and the concave points of the first coil 1755 correspond to the convex points of the second coil 1757 in a radial direction. In the first coil 1755, the portion of the first coil 1755 between adjacent convex points and concave points is a curve; in the second coil 1757, the portion of the second coil 1757 between adjacent convex points and concave points is a curve.

[0082] Specifically, in some embodiments, if the first coil 1755 includes a first convex point, and in the counterclockwise direction, the concave point 1753 adjacent to the first convex point is the first concave point, then in the counterclockwise direction, the second coil 1757 includes a second concave point located in the same radial direction as the first convex point, and a second convex point located in the same radial direction as the first concave point, and the portion of the first coil 1755 between the first convex point and the second concave point is a curve ( Figure 2 As shown), the portion of the second coil 1757 between the second convex point and the second concave point is a curve ( Figure 2 As shown, compared with the part of the first coil 1755 between the first convex point and the second concave point being a straight line, and the part of the second coil 1757 between the second convex point and the second concave point being a straight line, the induction coil 175 (receiving coil 17) in this embodiment is not easy to reflect the high-frequency signal in the transmitting coil 15, thereby reducing or even avoiding the problem of electromagnetic interference (EMI), thereby improving the working accuracy of the position sensor 100. It should be noted that the curve includes but is not limited to arc, "S" shape or wave shape. In the embodiment of the present application, the curve is an arc.

[0083] Please continue reading Figure 1 and Figure 2 In some embodiments, in the projection on the circuit board 11, the first coil 1755 and the second coil 1757 intersect to form a plurality of magnetic flux zones 1758, and each magnetic flux zone 1758 is surrounded by a portion of the first coil 1755 and a portion of the second coil 1757 between two intersection points 1759 formed by the intersection of the first coil 1755 and the second coil 1757. It should be noted that, in some embodiments, the number of magnetic flux zones 1758 may be 2Q (Q is the number of conductive portions 25 of the position sensor rotor 20), and the shapes and sizes of the plurality of magnetic flux zones 1758 are the same.

[0084] Specifically, in some embodiments, the first coil 1755 and the second coil 1757 cross to form a plurality of intersections 1759, and the first coil 1755 and the second coil 1757 between two adjacent intersections 1759 can jointly form a magnetic flux region 1758. The first coil 1755 and the second coil 1757 between two adjacent intersections 1759 have convex points 1751 and concave points 1753, respectively, and the convex points 1751 and the concave points 1753 are located in the same radial direction. When the two radial side edges 251 of the conductive part 25 (side edges of the conductive part 25 connected to the mounting part 23) respectively overlap with two adjacent intersection points 1759, the circumferential side edges 253 of the conductive part 25 (side edges of the conductive part 25 opposite to the mounting part 23 and connected to the two radial side edges 251) cover the convex points 1751 on the magnetic flux area 1758, that is, when the position sensor rotor 20 rotates to a certain angle, one conductive part 25 can just cover one magnetic flux area 1758. It can be understood that in this embodiment, the intersection of the first coil 1755 and the second coil 1757 does not mean that the first coil 1755 and the second coil 1757 are in contact, but the orthographic projection of the first coil 1755 in a plane perpendicular to the central axis of the position sensor rotor 20 intersects with the orthographic projection of the second coil 1757 in a plane perpendicular to the central axis of the position sensor rotor 20 to form intersection points 1759, and together form a plurality of magnetic flux areas 1758.

[0085] Further, in some embodiments, the intersection 1759 is located on a line segment connecting a convex point of the first coil 1755 and a corresponding concave point of the second coil 1757 , and is located on a line segment connecting a concave point of the first coil 1755 and a corresponding convex point of the second coil 1757 .

[0086] Specifically, please combine Figure 6In some embodiments, when the receiving coil 17 includes a first induction coil and a second induction coil, the first coil 1755 and the second coil 1757 in the first induction coil can cross to form a plurality of magnetic flux regions 1758, and the first coil 1755 and the second coil 1757 forming each magnetic flux region 1758 both have convex points 1751 and concave points 1753; the first coil 1755 and the second coil 1757 in the second induction coil can cross to form a plurality of intersection points 1759, and the formed plurality of intersection points 1759 are respectively located at In the plurality of magnetic flux regions 1758 of the first induction coil, and the intersection point 1759 in the magnetic flux region 1758 (formed by the intersection of the first coil 1755 and the second coil 1757 in the second induction coil) is located on the line segment connecting the convex point 1751 and the concave point 1753 on the magnetic flux region 1758, thereby, when a high-frequency AC signal is passed through the transmitting coil 15 and the position sensor rotor 20 rotates relative to the circuit board 11, the first induction coil (induction coil sin) and the second induction coil (induction coil cos) can both generate an induced voltage.

[0087] See also Figure 1 In some embodiments, two adjacent induction coils 175 in each set of receiving coils 17 are staggered. Wherein, N is the number of protrusions of the first coil 1755 , and M is the number of the induction coils 175 in each group of receiving coils 17 .

[0088] Specifically, in some embodiments, the angle between the protrusions 1751 of two adjacent induction coils 175 in each group of receiving coils 17 and the center of the mounting portion 23 is Thus, when a high-frequency AC signal is passed through the transmitting coil 15 and the position sensor rotor 20 rotates, one of the two adjacent induction coils 175 in each group of receiving coils 17 generates a sine signal, and the other of the two adjacent induction coils 175 in each group of receiving coils 17 generates a cosine signal. For example, when the number of protrusions of the first coil 1755 is 4 (at this time, the number Q of the conductive parts 25 is also 4), and the number M of the induction coils 175 in each group of receiving coils 17 is 2, the two induction coils 175 are staggered by 22.5°.

[0089] In a possible implementation, the working principle of the position sensor 100 may be:

[0090] When a high-frequency AC signal is passed through the transmitting coil 15, the transmitting coil 15 can generate an alternating magnetic field, and the position sensor rotor 20 can generate eddy currents under the action of the alternating magnetic field. The eddy currents can generate a new alternating magnetic field (secondary magnetic field), and the receiving coil 17 can receive the secondary magnetic field. When the position sensor rotor 20 rotates relative to the circuit board 11, the receiving coil 17 generates an induced voltage signal, wherein the area of ​​the receiving coil 17 covered by the position sensor rotor 20 (i.e., the magnetic flux area of ​​the magnetic field) changes, thereby causing the induced voltage generated by the receiving coil 17 to change with the rotation angle of the position sensor rotor 20.

[0091] Specifically, when a high-frequency AC signal is passed through the transmitting coil 15, the alternating magnetic field can pass through multiple magnetic flux zones 1758. Since the first coil 1755 and the second coil 1757 in each induction coil 175 are connected in series and cross to form multiple magnetic flux zones 1758 with the same area, the polarities of the current loops formed by two adjacent magnetic flux zones 1758 are opposite. Therefore, the induced electromotive forces generated by the two adjacent magnetic flux zones 1758 can offset each other, so that the receiving coil 17 will not generate an induced electromotive force under the action of the alternating magnetic field, that is, the receiving coil 17 will not generate an induced voltage under the action of the alternating magnetic field. In this embodiment, the plurality of conductive portions 25 can jointly cover half of the total area of ​​the plurality of magnetic flux zones 1758, and during the rotation of the position sensor rotor 20, the magnetic flux and the time rate of change of the magnetic flux of the magnetic flux zone 1758 covered by the conductive portion 25 and the magnetic flux zone 1758 not covered by the conductive portion 25 are inconsistent. Therefore, the induced electromotive force generated by the two adjacent magnetic flux zones 1758 is also different. In other words, the induced electromotive force generated by the two adjacent magnetic flux zones 1758 cannot cancel each other, and thus, the receiving coil 17 can generate an induced voltage.

[0092] See also Figure 1 In some embodiments, the circuit board 11 is provided with a plurality of through holes 111 corresponding to the convex points 1751 and the concave points 1753, and the through holes 111 are used to electrically connect the induction coils 175 of different wiring layers. It should be noted that in some embodiments, the cross-sectional shape of the through hole 111 can be circular, square, triangular or diamond, etc., which is not limited here. In the present application, the cross-sectional shape of the through hole 111 is circular.

[0093] Specifically, the number of through holes 111 is the same as the total number of protrusions 1751 and concave points 1753 on the induction coil 175. The number of protrusions 1751 on each induction coil 175 is 2N, and the number of concave points 1753 on each induction coil 175 is 2N. Then, the number of through holes 111 corresponding to one induction coil 175 is 4N, and the number of through holes 111 corresponding to a group of receiving coils 17 is M*4N (M is the number of induction coils 175 in each group of receiving coils 17). For example, when the induction coil 175 is arranged on the second wiring layer and the third wiring layer, the through hole 111 passes through the second wiring layer, so that the induction coil 175 can pass through the through hole 111 from the side of the second wiring layer away from the third wiring layer to the third wiring layer, and be arranged on the third wiring layer, and then pass back to the second wiring layer through the through hole 111, so as to realize the cross wiring of the induction coil 175 between different wiring layers.

[0094] In some embodiments, the distance between any two adjacent through holes 111 is D, where D≥0.15 mm. In some embodiments, the distance between any two adjacent through holes 111 may be any one of 0.15 mm, 0.20 mm, 0.25 mm, 0.30 mm, 0.35 mm, 0.40 mm, 0.45 mm, 0.50 mm, 0.55 mm and 0.60 mm or any value between any two values. It should be noted that the distance between any two adjacent through holes 111 may be: the distance between the through holes 111 corresponding to any two adjacent convex points 1751 along the circumferential direction of the position sensor rotor 20; or, the distance between the through holes 111 corresponding to any two adjacent concave points 1753 along the circumferential direction of the position sensor rotor 20; or the distance between adjacent convex points 1751 and concave points 1753 located in the same radial direction.

[0095] Due to the limitation of process and manufacturing requirements, if the distance D between any two adjacent through holes 111 is less than 0.15 mm, the two adjacent through holes 111 will be directly connected, that is, when the induction coil 175 crosses the wiring between different wiring layers through the through hole 111, the induction coils 175 will contact each other, which will cause the induction coil 175 to short-circuit, affecting the normal operation of the position sensor 100. In the present application, the distance D between any two adjacent through holes 111 is ≥ 0.15 mm, so that the two adjacent through holes 111 will not be connected, thereby avoiding the induction coil 175 from contacting and causing a short circuit, and ensuring the normal operation of the position sensor 100.

[0096] In some embodiments, the number of through holes 111 corresponding to the pits 1753 is n (n=M*2N), and The number of the conductive parts 25 is Q, and Wherein, d1 is the length of the line between the two points on the innermost end of the receiving coil 17 that are the farthest apart (i.e., the diameter of the first contour shape 173), S is the diameter of the through hole 111, M is the number of induction coils 175 in each group of receiving coils 17, n and Q are both integers, and Q=N, and N is the number of concave points 1753 on the first coil 1755 of the induction coil 175.

[0097] In some other embodiments, the number of through holes 111 corresponding to the bumps 1753 is n (n=M*2N), and The number of the conductive parts 25 is Q, and Wherein, d2 is the length of the line between the two points on the outermost end of the receiving coil 17 that are the farthest apart (i.e., the diameter of the second contour shape 171), S is the diameter of the through hole 111, M is the number of induction coils 175 in each group of receiving coils 17, n and Q are both integers, and Q=N, and N is the number of protrusions 1751 on the first coil 1755 of the induction coil 175.

[0098] The limitation on the number and diameter of the through holes 111 in the above-mentioned embodiment can, on the one hand, ensure that two adjacent through holes 111 will not be connected, avoid contact between the induction coils 175 and cause a short circuit, improve the safety performance of the position sensor stator 10 and the position sensor 100, and ensure the normal operation of the position sensor stator 10 and the position sensor 100; on the other hand, it can limit the number of induction coils 175, ensure the reasonable layout of the induction coils 175 on the circuit board 11, and reduce or even avoid mutual interference between the coils.

[0099] Two specific embodiments of the position sensor stator 10 of the position sensor 100 of the present application will be introduced below in combination with a conventional position sensor.

[0100] See also Figure 3 , Figure 3 The figure is a schematic diagram of the structure of a traditional position sensor (the transmitting coil is located outside the receiving coil) and a schematic diagram of the AC waveform generated by the receiving coil in the corresponding position sensor. Figure 3 The outermost end of the transmitting coil may have a size of 45 mm, and the innermost end of the receiving coil may have a size of 16 mm. The receiving coil includes two induction coils, which generate sine signals and cosine signals respectively, and each induction coil contains 8 protrusions. The number of conductive parts is 4, each pole is 45°, and the induction coil generating the sine signal and the induction coil generating the cosine signal are placed at a 22.5° offset.

[0101] When the transmitting coil is applied with an AC voltage of 2.5V and 3.5MHz, please combine Figure 3In Figure (a), when the position sensor rotor covers the transmitting coil, that is, when the diameter of the position sensor rotor (the length of the line connecting the two points on the end of the conductive part away from the mounting part and passing through the center of the mounting part) is greater than 45mm, the maximum value of the induced voltage generated by the receiving coil is 3.30mV. Figure 3 In Figure (b), when the position sensor rotor just covers the transmitting coil, that is, when the diameter of the position sensor rotor is equal to 45mm, the maximum value of the induced voltage generated by the receiving coil is 3.295mV. Figure 3 In Figure (c), when the position sensor rotor does not completely cover the transmitting coil, that is, when the diameter of the position sensor rotor is less than 45 mm, the maximum value of the induced voltage generated by the receiving coil is 2.95 mV.

[0102] In summary, when the transmitting coil is located outside the receiving coil, when the position sensor rotor over-covers the transmitting coil and the position sensor rotor just covers the transmitting coil, the induced voltage generated by the receiving coil remains basically unchanged; when the position sensor rotor does not completely cover the transmitting coil, for example, when the outer diameter of the conductive part is 2 mm smaller than the outer diameter of the transmitting coil, the induced voltage generated by the receiving coil drops from 3.295 mV to 2.95 mV, a decrease of 0.345 mV, a relative decrease of 10.47%, and a large degree of change.

[0103] Embodiment 1 of the present application

[0104] See also Figure 1 and Figure 2 The position sensor stator 10 of the position sensor 100 in the first embodiment includes a circuit board 11, a group of transmitting coils 15 and a group of receiving coils 17. The transmitting coil 15 includes a first excitation coil 155 and a second excitation coil 157 connected in series. The receiving coil 17 includes two induction coils 175, namely a first induction coil (induction coil sin) and a second induction coil (induction coil cos). The two induction coils 175 are offset. (Q is the number of the conductive parts 25, Q=4; M is the number of the induction coils 175 in the receiving coil 17, that is, M=2), that is, the two induction coils 175 are staggered by 22.5°.

[0105] The first induction coil and the second induction coil both include a first coil 1755 and a second coil 1757 connected in series. The first coil 1755 and the second coil 1757 cross to form a plurality of magnetic flux areas 1758. Under the action of the magnetic field generated by the transmitting coil 15, the polarities of the current loops formed by two adjacent magnetic flux areas 1758 are opposite. Thus, the induced electromotive forces generated by the two adjacent magnetic flux areas 1758 cancel each other out. That is to say, under the action of the magnetic field generated by the transmitting coil 15, neither of the two induction coils 175 generates an induced electromotive force.

[0106] In this embodiment, the shape of the conductive portion 25 matches the shape of the magnetic flux area 1758. When the position sensor rotor 20 rotates, the magnetic flux and the time change rate of the magnetic flux of the magnetic flux area 1758 covered by the conductive portion 25 and the magnetic flux area 1758 not covered by the conductive portion 25 are inconsistent. Therefore, the induced electromotive force generated by the two adjacent magnetic flux areas 1758 is also different. In other words, the induced electromotive force generated by the two adjacent magnetic flux areas 1758 cannot cancel each other. Therefore, the induced voltage generated by the first induction coil and the second induction coil can change with the rotation angle of the position sensor rotor 20. In addition, since the two induction coils 175 are staggered, the first induction coil can generate a sine signal, and the other of the second induction coils can generate a cosine signal.

[0107] The number of magnetic flux areas 1758 formed by the first coil 1755 and the second coil 1757 in the first induction coil may be 2Q, that is, the number of magnetic flux areas 1758 in the first induction coil is 8. Since the first coil 1755 and the second coil 1757 in the first induction coil are connected in series and cross-connected to form a plurality of magnetic flux areas 1758 with the same area, the polarities of the current loops formed by two adjacent magnetic flux areas 1758 are opposite, and thus, the induced electromotive forces generated by the two adjacent magnetic flux areas 1758 can cancel each other, so that the first induction coil will not generate an induced electromotive force only under the magnetic field of the transmitting coil 15. Accordingly, the second induction coil will not generate an induced electromotive force only under the magnetic field of the transmitting coil 15. The four conductive parts 25 can jointly cover half of the total area of ​​the eight magnetic flux zones 1758 in the first induction coil, and during the rotation of the position sensor rotor 20, the magnetic flux and the time rate of change of the magnetic flux of the magnetic flux zone 1758 covered by the conductive part 25 and the magnetic flux zone 1758 not covered by the conductive part 25 are inconsistent. Therefore, the induced electromotive force generated by the two adjacent magnetic flux zones 1758 is also different. In other words, the induced electromotive force generated by the two adjacent magnetic flux zones 1758 cannot offset each other. Therefore, the first induction coil can generate an induced voltage, and the induced voltage changes with the rotation angle of the position sensor rotor 20; accordingly, the second induction coil can also generate an induced voltage, and the induced voltage changes continuously with the rotation angle of the position sensor rotor 20.

[0108] In this embodiment, the induction coil 175 between the adjacent convex points 1751 and concave points 1753 on the receiving coil 17 is a curve. Specifically, in the first coil 1755 of the first induction coil of the receiving coil 17, part of the first coil 1755 between the adjacent convex points 1751 and concave points 1753 is a curve, and in the second coil 1757 of the first induction coil of the receiving coil 17, part of the second coil 1757 between the adjacent convex points 1751 and concave points 1753 is a curve; accordingly, in the first coil 1755 of the second induction coil of the receiving coil 17, part of the first coil 1755 between the adjacent convex points 1751 and concave points 1753 is a curve, and in the second coil 1757 of the second induction coil of the receiving coil 17, part of the second coil 1757 between the adjacent convex points 1751 and concave points 1753 is a curve.

[0109] In this embodiment, the outermost end of the position sensor rotor 20 covers the outermost end of the receiving coil 17, and the transmitting coil 15 is arranged between the outermost end of the receiving coil 17 and the innermost end of the receiving coil 17. Therefore, compared with the traditional position sensor in which the transmitting coil is located outside the receiving coil, when the diameter of the transmitting coil 15 is the same, the size of the induction coil 175 in this embodiment is larger. Therefore, the coupling ability between the receiving coil 17 and the position sensor rotor 20 is stronger, thereby increasing the induced voltage generated by the receiving coil 17, thereby ensuring the working stability of the position sensor stator 10 and improving the working accuracy of the position sensor 100.

[0110] Furthermore, in the present embodiment, the receiving coil 17 protrudes radially relative to the transmitting coil 15, and the protruding portion is arc-shaped, thereby ensuring the curvature of the receiving coil 17. Compared with the straight-line receiving coil 17, the receiving coil 17 in the present embodiment is less likely to reflect the high-frequency signal in the transmitting coil 15, thereby reducing or even avoiding the electromagnetic interference (EMI) problem, thereby improving the working accuracy of the position sensor 100.

[0111] Figure 1 Schematic diagram of the structure of the position sensor 100 in this embodiment. Figure 1 The diameter of the second contour shape 171 (2*r2) of the receiving coil 17 can be 45 mm, the diameter of the first contour shape 173 (2*r1) of the receiving coil 17 can be 16 mm, the diameter of the fourth contour shape 151 of the transmitting coil 15 (2*r4) can be 40 mm, the diameter of the third contour shape 153 of the transmitting coil 15 (2*r3) can be 36 mm, and the diameter of the position sensor rotor 20 is 22.5 mm. Therefore, compared with Figure 3As for the position sensor shown in the figure, the size of the transmitting coil 15 in this embodiment is relatively small, so the impedance of the transmitting coil 15 is relatively small. When the same voltage is applied, the current in the transmitting coil 15 increases, thereby causing the current density of the eddy current generated on the position sensor rotor 20 to change, thereby increasing the energy returned to the receiving coil 17, that is, increasing the induced voltage generated by the receiving coil 17.

[0112] Please combine Figure 4 and Figure 5 , when the voltage applied to the transmitting coil 15 is the same, the maximum value of the alternating current in the transmitting coil of the conventional position sensor is 46.36 mA ( Figure 4 As shown), the maximum value of the alternating current in the transmitting coil 15 in the position sensor stator 10 of the position sensor 100 of this embodiment is 46.78 mA ( Figure 5 As shown), it increases by 0.42mA. Figure 6 , Figure 6 The "sin" in the figure represents the induced voltage generated by the induction coil sin of the receiving coil 17 in this embodiment. Figure 6 The "cos" in the figure represents the induced voltage generated by the induction coil cos of the receiving coil 17 in this embodiment, wherein the maximum value of the induced voltage generated by the receiving coil 17 (including the induction coil sin and the induction coil cos) in the position sensor stator 10 of this embodiment is 6.31mV, which is 2.5mV higher than the maximum value of the induced voltage of the traditional position sensor, a relative increase of 65.61%.

[0113] In summary, compared with the traditional position sensor in which the transmitting coil is located outside the receiving coil, when the size of the transmitting coil 15 is the same, the size of the induction coil 175 in this embodiment is larger. Therefore, the coupling ability between the receiving coil 17 and the position sensor rotor 20 is stronger, thereby increasing the induced voltage generated by the receiving coil 17, thereby ensuring the working stability of the position sensor stator 10 and improving the working accuracy of the position sensor stator 10.

[0114] In addition, when the size of the position sensor rotor 20 is the same and the voltage applied to the transmitting coil 15 is also the same, the size of the transmitting coil 15 in this embodiment is smaller. Therefore, the current in the transmitting coil 15 increases, so that the current density of the eddy current generated on the position sensor rotor 20 changes, and the energy returned to the receiving coil 17 is increased, which can also increase the induced voltage generated by the induction coil 175, thereby improving the working accuracy of the position sensor stator 10.

[0115] Embodiment 2

[0116] See also Figure 1 and Figure 7The difference between the position sensor stator 10 of the position sensor 100 of the second embodiment and the position sensor stator 10 of the position sensor 100 in the first embodiment is that the receiving coil 17 includes two groups (a first group of receiving coils 177 and a second group of receiving coils 179), and the first group of receiving coils 177 includes opposite outermost ends and innermost ends in the radial direction; in the projection on the circuit board 11, the second group of receiving coils 179 is arranged between the outermost end of the first group of receiving coils 177 and the innermost end of the first group of receiving coils 177.

[0117] Specifically, in the present embodiment, the second group of receiving coils 179 is disposed between the outermost end of the first group of receiving coils 177 and the innermost end of the first group of receiving coils 177, that is, the diameter D1 of the contour shape of the projection of the outermost end of the induction coil in the first group of receiving coils 177 in the length and width plane of the circuit board 11 is greater than the diameter D3 of the contour shape of the projection of the outermost end of the induction coil in the second group of receiving coils 179 in the length and width plane of the circuit board 11, and the diameter D2 of the contour shape of the projection of the innermost end of the induction coil in the first group of receiving coils 177 in the length and width plane of the circuit board 11 is smaller than the diameter D4 of the contour shape of the projection of the innermost end of the induction coil in the second group of receiving coils 179 in the length and width plane of the circuit board 11. Therefore, compared with the case where the receiving coil 17 includes only one group, the arrangement of the two groups of receiving coils 17 can improve the detection accuracy of the position sensor 100 on the one hand; on the other hand, it can improve the coupling ability between the receiving coil 17 and the position sensor rotor 20, increase the induced voltage output by the receiving coil 17, and improve the working stability of the position sensor 100.

[0118] The first receiving coil group 177 and the second receiving coil group 179 each include two induction coils, and the two induction coils are staggered. Setting (Q is the number of conductive parts 25, Q=2; M is the number of induction coils in the first group of receiving coils 177 or the second group of receiving coils 179, that is, M=2), that is, the two induction coils in the first group of receiving coils 177 and the second group of receiving coils 179 are both staggered by 22.5°.

[0119] In this embodiment, each induction coil in the first group of receiving coils 177 includes a first coil and a second coil connected in series, the first coil and the second coil cross to form a plurality of magnetic flux zones, and under the action of the magnetic field generated by the transmitting coil 15, the polarity of the current loop formed by two adjacent magnetic flux zones in the first coil and the second coil is opposite. Correspondingly, each induction coil in the second group of receiving coils 179 includes a first coil and a second coil connected in series, the first coil and the second coil cross to form a plurality of magnetic flux zones, and under the action of the magnetic field generated by the transmitting coil 15, the polarity of the current loop formed by two adjacent magnetic flux zones in the first coil and the second coil is opposite.

[0120] Among them, the two induction coils in the first group of receiving coils 177 (including the induction coil sin1 and the induction coil cos1) generate sine signals and cosine signals respectively; the two induction coils in the second group of receiving coils 179 (including the induction coil sin2 and the induction coil cos2) also generate sine signals and cosine signals respectively.

[0121] In this embodiment, the outermost end of the first group of receiving coils 177 includes a plurality of convex points on the contour shape of the projection within the length and width plane of the circuit board 11, and the innermost end of the first group of receiving coils 177 includes a plurality of concave points on the contour shape of the projection within the length and width plane of the circuit board 11, and the plurality of convex points and the plurality of concave points are opposite to each other in the radial direction of the first group of receiving coils 177; the outermost end of the second group of receiving coils 179 includes a plurality of convex points on the contour shape of the projection within the length and width plane of the circuit board 11, and the innermost end of the second group of receiving coils 179 includes a plurality of concave points on the contour shape of the projection within the length and width plane of the circuit board 11, and the plurality of convex points and the plurality of concave points are opposite to each other in the radial direction of the second group of receiving coils 179. Among them, the protrusions on the induction coils that generate sinusoidal signals in the first group of receiving coils 177 and the protrusions on the induction coils that generate sinusoidal signals in the second group of receiving coils 179 are opposite to each other in the radial direction of the first group of receiving coils 177; the protrusions on the induction coils that generate cosine signals in the first group of receiving coils 177 and the protrusions on the induction coils that generate cosine signals in the second group of receiving coils 179 are opposite to each other in the radial direction of the first group of receiving coils 177.

[0122] In this embodiment, the magnetic flux zone of the induction coil (induction coil sin2) that generates a sinusoidal signal in the second group of receiving coils 179 is located within the magnetic flux zone of the induction coil (induction coil sin1) that generates a sinusoidal signal in the first group of receiving coils 177; correspondingly, the magnetic flux zone of the induction coil (induction coil cos2) that generates a cosine signal in the second group of receiving coils 179 is located within the magnetic flux zone of the induction coil (induction coil cos1) that generates a cosine signal in the first group of receiving coils 177. Thus, when the position sensor rotor 20 rotates a predetermined angle so that the conductive portion 25 just completely covers the magnetic flux zone in the first group of receiving coils 177, the conductive portion 25 can also just completely cover the magnetic flux zone in the second group of receiving coils 179.

[0123] In this embodiment, the outermost end of the position sensor rotor 20 covers the outermost end of the first group of receiving coils 177, and the transmitting coil 15 is arranged between the outermost end of the first group of receiving coils 177 and the innermost end of the first group of receiving coils 177. Therefore, compared with the traditional position sensor stator in which the transmitting coil is completely located outside the receiving coil, the size of the induction coil in this embodiment is larger. Therefore, the coupling ability between the receiving coil 17 and the position sensor rotor 20 is stronger, thereby increasing the induced voltage generated by the receiving coil 17, thereby ensuring the working stability of the position sensor 100 and improving the working accuracy of the position sensor 100.

[0124] Furthermore, in the present embodiment, the first group of receiving coils 177 protrude radially relative to the transmitting coil 15, and the protruding portion is arc-shaped, thereby ensuring the curvature of the first group of receiving coils 177. Compared with the straight-line receiving coil 17, the receiving coil 17 in the present embodiment is not easy to reflect the high-frequency signal in the transmitting coil 15, thereby reducing or even avoiding the electromagnetic interference (EMI) problem, thereby improving the working accuracy of the position sensor stator 10.

[0125] In this embodiment, the working principle of the position sensor stator 10 may be:

[0126] When a high-frequency AC signal is passed through the transmitting coil 15, the transmitting coil 15 can generate an alternating magnetic field, and the position sensor rotor 20 can generate eddy currents under the action of the alternating magnetic field. The eddy currents can generate a new alternating magnetic field (secondary magnetic field). The first group of receiving coils 177 and the second group of receiving coils 179 can both receive signals generated by the secondary magnetic field, and when the position sensor rotor 20 rotates relative to the circuit board 11, the first group of receiving coils 177 outputs a first group of induced voltage signals, and the second group of receiving coils 179 outputs a second group of induced voltage signals, wherein the areas of the first group of receiving coils 177 and the second group of receiving coils 179 covered by the position sensor rotor 20 (i.e., the magnetic flux area of ​​the magnetic field) are constantly changing, thereby enabling the first group of induced voltages and the second group of induced voltages to change with the rotation angle of the position sensor rotor 20.

[0127] Specifically, when a high-frequency AC signal is passed through the transmitting coil 15, the alternating magnetic field can pass through multiple magnetic flux areas of the first group of receiving coils 177 and multiple magnetic flux areas of the second group of receiving coils 179, wherein neither the first group of receiving coils 177 nor the second group of receiving coils 179 generates an induced electromotive force under the action of the alternating magnetic field. In this embodiment, the multiple conductive portions 25 can cover half of the total area of ​​the multiple magnetic flux areas together, and during the rotation of the position sensor rotor 20, the magnetic flux and the time rate of change of the magnetic flux in the magnetic flux area covered by the conductive portion 25 and the magnetic flux area not covered by the conductive portion 25 are inconsistent, so the induced electromotive force generated by the two adjacent magnetic flux areas is also different. In other words, the induced electromotive force generated by the two adjacent magnetic flux areas cannot cancel each other, and thus, the first group of receiving coils 177 and the second group of receiving coils 179 can generate an induced electromotive force.

[0128] Please combine Figure 3 , Figure 8 and Fig. 9 , Figure 8 The "sin1" in the figure represents the induced voltage generated by the induction coil sin1 of the first group of receiving coils 177 in this embodiment. Figure 8 "cos1" in the figure represents the induced voltage generated by the induction coil cos1 of the first group of receiving coils 177 in this embodiment; Fig. 9 The "sin2" in the figure represents the induced voltage generated by the induction coil sin1 of the second group of receiving coils 179 in this embodiment. Fig. 9 "cos2" in the figure represents the induced voltage generated by the induction coil cos1 of the second group of receiving coils 179 in this embodiment. When the voltage passed through the transmitting coil 15 is the same, the maximum value of the induced voltage generated by the receiving coil in the traditional position sensor is 3.30mV, the maximum value of the induced voltage generated by the first group of receiving coils 177 (including the induction coil sin1 and the induction coil cos1) in the position sensor stator 10 of this embodiment is 9.87mV, and the maximum value of the induced voltage generated by the second group of receiving coils 179 (including the induction coil sin2 and the induction coil cos2) is 2.11mV. Compared with the first embodiment with only the induction coils Sin1 and Cos1, the peak value of the induced voltage of the second embodiment increases from 6.31mV to 9.87mV, an increase of 3.56mV, a relative increase of 56.42%, and compared with the traditional position sensor, the peak value of the induced voltage of the second embodiment increases from 3.81mV to 9.87mV, an increase of 6.06mV, a relative increase of 159%.

[0129] To sum up, compared with the traditional position sensor in which the transmitting coil is located outside the receiving coil, when the size of the position sensor rotor 20 is the same, the size of the transmitting coil 15 in this embodiment is smaller, and the size of the receiving coil 17 is larger. Therefore, the coupling ability between the receiving coil 17 and the position sensor rotor 20 is stronger, thereby increasing the induced voltage generated by the receiving coil 17, thereby ensuring the working stability of the position sensor stator 10 and improving the working accuracy of the position sensor 100.

[0130] In addition, please combine Fig.10 When the integrated circuit 200 of the position sensor system 1000 obtains the first group of induced voltage signals generated by the first group of receiving coils 177 and the second group of induced voltage signals generated by the second group of receiving coils 179, the integrated circuit 200 can analyze and process the first group of induced voltage signals to obtain the main position information of the position sensor rotor 20, and analyze and process the second group of induced voltage signals to obtain the secondary position information of the position sensor rotor 20, and use the secondary position information to correct the main position information to obtain the final position information of the position sensor rotor 20. Therefore, compared with the receiving coil 17 only including one group of receiving coils 17, the working accuracy of the position sensor 100 in this embodiment is higher.

[0131] For example, when the position information is angle information, if the integrated circuit 200 obtains that the position sensor rotor 20 has rotated 20° relative to the circuit board 11 according to the first set of induced voltage signals, and obtains that the position sensor rotor 20 has rotated 53′ relative to the circuit board 11 according to the second set of induced voltage signals, then the integrated circuit 200 can obtain the final position information of the position sensor rotor 20 as 20°53′.

[0132] See also Figure 1 , Figure 7 and Fig.10 The position sensor system 1000 of the embodiment of the present application includes the position sensor 100 of any of the above embodiments and an integrated circuit 200. The integrated circuit 200 is disposed on the circuit board 11 and is electrically connected to the position sensor 100.

[0133] Specifically, in some embodiments, the integrated circuit 200 can be electrically connected to both the transmitting coil 15 and the receiving coil 17, so that the integrated circuit 200 can supply power to the transmitting coil 15, and receive and process the induced voltage signal generated by the receiving coil 17, so that the integrated circuit 200 can obtain the position information of the position sensor rotor 20 (for example, the rotation angle of the position sensor rotor 20) through the induced voltage signal. It should be noted that, in some embodiments, the integrated circuit 200 can be electrically connected to the receiving coil 17 through the through hole 111 corresponding to any one of the bumps 1751 on the second contour shape 171.

[0134] It is understandable that, since the position sensor system 1000 in this embodiment includes the position sensor 100 of any of the above embodiments, the position sensor system 1000 at least includes the same beneficial effects as the position sensor 100, which will not be elaborated herein.

[0135] See also Figure 1 , Figure 7 and Fig.10 The motor 3000 of some embodiments of the present application includes a rotating shaft 2000 and the position sensor 100 of the above embodiment. The position sensor rotor 20 is sleeved on the rotating shaft 2000 and can rotate together with the rotating shaft 2000.

[0136] Specifically, in some embodiments, the mounting portion 23 of the position sensor rotor 20 is sleeved on the rotating shaft 2000, and when the rotating shaft 2000 rotates, the position sensor rotor 20 can rotate together with the rotating shaft 2000, thereby enabling the area of ​​the receiving coil 17 covered by the position sensor rotor 20 (i.e., the magnetic flux area of ​​the magnetic field) to change, so that the induced voltage generated by the receiving coil 17 can also change with the rotation angle of the position sensor rotor 20.

[0137] It is understandable that, since the motor 3000 in this embodiment includes the position sensor 100 of any of the above embodiments, the motor 3000 at least also includes the same beneficial effects as the position sensor 100, which will not be elaborated here.

[0138] See also Fig.10 and Fig.11 , the electric assembly 4000 of certain embodiments of the present application includes the motor 3000 of the above-mentioned embodiment.

[0139] Specifically, in some embodiments, the electric assembly 4000 may further include a controller (not shown), which is electrically connected to the motor 3000 and can control the operation of the motor 3000. It is understandable that since the electric assembly 4000 in this embodiment includes the motor 3000 of the above embodiment, the electric assembly 4000 at least includes the same beneficial effects as the motor 3000, which will not be described in detail.

[0140] See also Fig.11 , the vehicle 5000 of certain embodiments of the present application includes the electric assembly 4000 of the above embodiment. Among them, the vehicle 5000 includes but is not limited to passenger vehicles such as pure electric vehicles and hybrid vehicles or large engineering vehicles with not very bad working conditions. It can be understood that since the vehicle 5000 in this embodiment includes the electric assembly 4000 of the above embodiment, the vehicle 5000 at least includes the same beneficial effects as the electric assembly 4000, which will not be repeated here.

[0141] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. At the same time, other implementation methods can be derived from the above-mentioned embodiments, so that structural and logical replacements and changes can be made without departing from the scope of this disclosure.

[0142] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A position sensor stator, characterized in that: include: Circuit boards; A transmitting coil, wherein the transmitting coil is arranged on the circuit board; and A receiving coil, the receiving coil is arranged on the circuit board and is located on a different layer of the circuit board from the transmitting coil, and the receiving coil includes an outermost end and an innermost end opposite to each other in a radial direction; In the projection on the circuit board, the transmitting coil is arranged between the outermost end of the receiving coil and the innermost end of the receiving coil, the receiving coil protrudes along the radial direction relative to the transmitting coil, and the protruding part is arc-shaped.

2. The position sensor stator according to claim 1, characterized in that: In the projection on the circuit board, a portion of any receiving coil protruding in the radial direction relative to the transmitting coil intersects with the outermost circle of the transmitting coil and forms two intersection points, and a portion of the receiving coil between the two intersection points is a curve.

3. The position sensor stator according to claim 2, characterized in that: A portion of the receiving coil between the two intersection points protrudes in a direction away from the transmitting coil.

4. The position sensor stator according to claim 1, characterized in that: The receiving coil includes a plurality of induction coils, each of the induction coils includes a first coil and a second coil connected in series, the first coil bends and extends in a clockwise direction, the second coil bends and extends in a counterclockwise direction, the first coil and the second coil each include N convex points and N concave points, the convex points are located at the outermost end of the receiving coil, and the concave points are located at the innermost end of the receiving coil; and the first coil and the second coil are offset by a certain angle in the circumferential direction.

5. The position sensor stator according to claim 4, characterized in that: The convex points of the first coil correspond one-to-one with the concave points of the second coil in the radial direction, and the concave points of the first coil correspond one-to-one with the convex points of the second coil in the radial direction; In the first coil, a portion of the first coil between adjacent convex points and concave points is a curve; in the second coil, a portion of the second coil between adjacent convex points and concave points is a curve.

6. The position sensor stator according to claim 4, characterized in that: The circuit board comprises a plurality of stacked wiring layers; the circuit board is provided with a plurality of through holes corresponding to the protrusions and the concave points, and the through holes are used to electrically connect the induction coils between different wiring layers.

7. The position sensor stator according to claim 6, characterized in that: The distance between any two adjacent through holes is D, where D≥0.15 mm.

8. The position sensor stator according to claim 6, characterized in that: The number of through holes corresponding to the concave points is n, and Wherein, d1 is the length of the line between the two points on the innermost end of the receiving coil that are the farthest apart, S is the diameter of the through hole, and n is an integer.

9. The position sensor stator according to claim 4, characterized in that: In the projection on the circuit board, the first coil and the second coil intersect to form a plurality of magnetic flux zones, each of which is surrounded by a portion of the first coil and a portion of the second coil between two intersection points formed by the intersection of the first coil and the second coil.

10. The position sensor stator according to claim 4, characterized in that: The two adjacent induction coils in each group of receiving coils are staggered Wherein, N is the number of protrusions of the first coil, and M is the number of the induction coils in each group of the receiving coils.

11. The position sensor stator according to claim 1, characterized in that: The receiving coil is a quasi-sine coil, and the transmitting coil includes a toroidal coil or a quasi-toroidal coil; The receiving coil is coaxially arranged with the transmitting coil.

12. The position sensor stator according to any one of claims 1 to 11, characterized in that: The receiving coil includes a first group of receiving coils and a second group of receiving coils, the first group of receiving coils including an outermost end and an innermost end opposite to each other in the radial direction; in the projection on the circuit board, the second group of receiving coils is arranged between the outermost end of the first group of receiving coils and the innermost end of the first group of receiving coils.

13. A position sensor, characterized in that: include: The position sensor stator according to any one of claims 1 to 12; and A position sensor rotor is disposed opposite to the circuit board and is rotatable relative to the circuit board.

14. The position sensor according to claim 13, characterized in that: The position sensor rotor includes a plurality of conductive portions, and an outermost end of the position sensor rotor covers an outermost end of the receiving coil.

15. The position sensor according to claim 14, characterized in that: The number of the conductive parts is Q, and Q=N, wherein Q is an integer, and N is the number of protrusions on the first coil of the induction coil of the receiving coil.

16. A position sensor system, characterized in that: include: The position sensor according to any one of claims 13 to 15; and An integrated circuit is arranged on the circuit board and is electrically connected to the position sensor.

17. A motor, characterized in that: include: The position sensor according to any one of claims 13 to 15; as well as The position sensor rotor of the position sensor is sleeved on the rotation shaft and can rotate together with the rotation shaft.

18. An electric assembly, characterized in that: include: The motor of claim 17.

19. A vehicle, characterized in that: include: The electric assembly of claim 18.

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